329 results on '"Ronnenberg A"'
Search Results
2. Erythropoietin enhances hippocampal long-term potentiation and memory
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El-Kordi Ahmed, Radyushkin Konstantin, Sperling Swetlana, Hannke Kathrin, Hassouna Imam, Müller Michael, Zhang Mingyue, Theis Fabian, Gertler Christoph, Medrihan Lucian, Stradomska Alicja, Sargin Derya, Adamcio Bartosz, Schulze Lizzy, Ronnenberg Anja, Wolf Fred, Brose Nils, Rhee Jeong-Seop, Zhang Weiqi, and Ehrenreich Hannelore
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Biology (General) ,QH301-705.5 - Abstract
Abstract Background Erythropoietin (EPO) improves cognition of human subjects in the clinical setting by as yet unknown mechanisms. We developed a mouse model of robust cognitive improvement by EPO to obtain the first clues of how EPO influences cognition, and how it may act on hippocampal neurons to modulate plasticity. Results We show here that a 3-week treatment of young mice with EPO enhances long-term potentiation (LTP), a cellular correlate of learning processes in the CA1 region of the hippocampus. This treatment concomitantly alters short-term synaptic plasticity and synaptic transmission, shifting the balance of excitatory and inhibitory activity. These effects are accompanied by an improvement of hippocampus dependent memory, persisting for 3 weeks after termination of EPO injections, and are independent of changes in hematocrit. Networks of EPO-treated primary hippocampal neurons develop lower overall spiking activity but enhanced bursting in discrete neuronal assemblies. At the level of developing single neurons, EPO treatment reduces the typical increase in excitatory synaptic transmission without changing the number of synaptic boutons, consistent with prolonged functional silencing of synapses. Conclusion We conclude that EPO improves hippocampus dependent memory by modulating plasticity, synaptic connectivity and activity of memory-related neuronal networks. These mechanisms of action of EPO have to be further exploited for treating neuropsychiatric diseases.
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- 2008
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3. NMDAR1 autoantibodies amplify behavioral phenotypes of genetic white matter inflammation: a mild encephalitis model with neuropsychiatric relevance
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Arinrad, Sahab, Wilke, Justus B. H., Seelbach, Anna, Doeren, José, Hindermann, Martin, Butt, Umer Javed, Steixner-Kumar, Agnes A., Spieth, Lena, Ronnenberg, Anja, Pan, Hong, Berghoff, Stefan A., Hollmann, Michael, Lühder, Fred, Nave, Klaus-Armin, Bechter, Karl, and Ehrenreich, Hannelore
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- 2022
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4. Isolated catatonia-like executive dysfunction in mice with forebrain-specific loss of myelin integrity
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Sahab Arinrad, Constanze Depp, Sophie B Siems, Andrew Octavian Sasmita, Maria A Eichel, Anja Ronnenberg, Kurt Hammerschmidt, Katja A Lüders, Hauke B Werner, Hannelore Ehrenreich, and Klaus-Armin Nave
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myelin ,mouse mutant ,oligodendrocytes ,glia function ,disease model ,executive functions ,Medicine ,Science ,Biology (General) ,QH301-705.5 - Abstract
A key feature of advanced brain aging includes structural defects of intracortical myelin that are associated with secondary neuroinflammation. A similar pathology is seen in specific myelin mutant mice that model ‘advanced brain aging’ and exhibit a range of behavioral abnormalities. However, the cognitive assessment of these mutants is problematic because myelin-dependent motor-sensory functions are required for quantitative behavioral readouts. To better understand the role of cortical myelin integrity for higher brain functions, we generated mice lacking Plp1, encoding the major integral myelin membrane protein, selectively in ventricular zone stem cells of the mouse forebrain. In contrast to conventional Plp1 null mutants, subtle myelin defects were restricted to the cortex, hippocampus, and underlying callosal tracts. Moreover, forebrain-specific Plp1 mutants exhibited no defects of basic motor-sensory performance at any age tested. Surprisingly, several behavioral alterations reported for conventional Plp1 null mice (Gould et al., 2018) were absent and even social interactions appeared normal. However, with novel behavioral paradigms, we determined catatonia-like symptoms and isolated executive dysfunction in both genders. This suggests that loss of myelin integrity has an impact on cortical connectivity and underlies specific defects of executive function. These observations are likewise relevant for human neuropsychiatric conditions and other myelin-related diseases.
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- 2023
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5. Teaching Note--Pick Your Platform: Social Media Advocacy Skill Building
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Gilster, Megan E., Kleinschmit, Julia L., Cummings, Stephen P., and Ronnenberg, Megan M.
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Skilled, ethical use of social media can advance social justice, impact policy, engage and educate the community, and elevate social workers. To assure that MSW students develop these skills, we created an assignment that required students to use a professional social media profile to advocate for a cause or policy based on findings from a needs and strengths assessment conducted as a group project. We used class discussion, readings, and online tutorials to support students' learning. We conducted a pretest-posttest evaluation and found a statistically significant increase in competency and knowledge of written and unwritten rules of each platform. Our recommendations for implementing the assignment include encouraging students to develop a professional presence on the platform earlier and requiring tutorials.
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- 2020
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6. Autoantibodies against NMDA receptor 1 modify rather than cause encephalitis
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Wilke, Justus B. H., Hindermann, Martin, Berghoff, Stefan A., Zihsler, Svenja, Arinrad, Sahab, Ronnenberg, Anja, Barnkothe, Nadine, Steixner-Kumar, Agnes A., Röglin, Stefan, Stöcker, Winfried, Hollmann, Michael, Nave, Klaus-Armin, Lühder, Fred, and Ehrenreich, Hannelore
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- 2021
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7. Variation of blubber thickness for three marine mammal species in the southern Baltic Sea
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Ursula Siebert, Miguel L. Grilo, Tina Kesselring, Kristina Lehnert, Katrin Ronnenberg, Iwona Pawliczka, Anders Galatius, Line A. Kyhn, Michael Dähne, and Anita Gilles
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blubber thickness ,harbor seals ,grey seals ,harbor porpoises ,natural variations ,HELCOM area ,Physiology ,QP1-981 - Abstract
Evaluating populational trends of health condition has become an important topic for marine mammal populations under the Marine Strategy Framework Directive (MSFD). In the Baltic Sea, under the recommendation of Helsinki Commission (HELCOM), efforts have been undertaken to use blubber thickness as an indicator of energy reserves in marine mammals. Current values lack geographical representation from the entire Baltic Sea area and a large dataset is only available for grey seals (Halichoerus grypus) from Sweden and Finland. Knowledge on variation of blubber thickness related to geography throughout the Baltic Sea is important for its usage as an indicator. Such evaluation can provide important information about the energy reserves, and hence, food availability. It is expected that methodological standardization under HELCOM should include relevant datasets with good geographical coverage that can also account for natural variability in the resident marine mammal populations. In this study, seasonal and temporal trends of blubber thickness were evaluated for three marine mammal species—harbor seal (Phoca vitulina), grey seal (Halichoerus grypus) and harbor porpoise (Phocoena phocoena)—resident in the southern Baltic Sea collected and investigated under stranding networks. Additionally, the effects of age, season and sex were analyzed. Seasonal variation of blubber thickness was evident for all species, with harbor seals presenting more pronounced effects in adults and grey seals and harbor porpoises presenting more pronounced effects in juveniles. For harbor seals and porpoises, fluctuations were present over the years included in the analysis. In the seal species, blubber thickness values were generally higher in males. In harbor seals and porpoises, blubber thickness values differed between the age classes: while adult harbor seals displayed thicker blubber layers than juveniles, the opposite was observed for harbor porpoises. Furthermore, while an important initial screening tool, blubber thickness assessment cannot be considered a valid methodology for overall health assessment in marine mammals and should be complemented with data on specific health parameters developed for each species.
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- 2022
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8. Inducing sterile pyramidal neuronal death in mice to model distinct aspects of gray matter encephalitis
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Justus B. H. Wilke, Martin Hindermann, Amir Moussavi, Umer Javed Butt, Rakshit Dadarwal, Stefan A. Berghoff, Aref Kalantari Sarcheshmeh, Anja Ronnenberg, Svenja Zihsler, Sahab Arinrad, Rüdiger Hardeland, Jan Seidel, Fred Lühder, Klaus-Armin Nave, Susann Boretius, and Hannelore Ehrenreich
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Diphtheria toxin ,Hippocampal learning and memory ,(pre)frontal network dysfunction ,Social cognition ,Thermography ,Magnetic resonance imaging ,Neurology. Diseases of the nervous system ,RC346-429 - Abstract
Abstract Up to one person in a population of 10,000 is diagnosed once in lifetime with an encephalitis, in 50–70% of unknown origin. Recognized causes amount to 20–50% viral infections. Approximately one third of affected subjects develops moderate and severe subsequent damage. Several neurotropic viruses can directly infect pyramidal neurons and induce neuronal death in cortex and hippocampus. The resulting encephalitic syndromes are frequently associated with cognitive deterioration and dementia, but involve numerous parallel and downstream cellular and molecular events that make the interpretation of direct consequences of sudden pyramidal neuronal loss difficult. This, however, would be pivotal for understanding how neuroinflammatory processes initiate the development of neurodegeneration, and thus for targeted prophylactic and therapeutic interventions. Here we utilized adult male NexCreERT2xRosa26-eGFP-DTA (= ‘DTA’) mice for the induction of a sterile encephalitis by diphtheria toxin-mediated ablation of cortical and hippocampal pyramidal neurons which also recruits immune cells into gray matter. We report multifaceted aftereffects of this defined process, including the expected pathology of classical hippocampal behaviors, evaluated in Morris water maze, but also of (pre)frontal circuit function, assessed by prepulse inhibition. Importantly, we modelled in encephalitis mice novel translationally relevant sequelae, namely altered social interaction/cognition, accompanied by compromised thermoreaction to social stimuli as convenient readout of parallel autonomic nervous system (dys)function. High resolution magnetic resonance imaging disclosed distinct abnormalities in brain dimensions, including cortical and hippocampal layering, as well as of cerebral blood flow and volume. Fluorescent tracer injection, immunohistochemistry and brain flow cytometry revealed persistent blood–brain-barrier perturbance and chronic brain inflammation. Surprisingly, blood flow cytometry showed no abnormalities in circulating major immune cell subsets and plasma high-mobility group box 1 (HMGB1) as proinflammatory marker remained unchanged. The present experimental work, analyzing multidimensional outcomes of direct pyramidal neuronal loss, will open new avenues for urgently needed encephalitis research.
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- 2021
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9. Trends in shaken baby syndrome diagnosis codes among young children hospitalized for abuse
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Aislinn Conrad, Brandon Butcher, Resmiye Oral, Megan Ronnenberg, and Corinne Peek-Asa
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Shaken baby syndrome ,Abusive head trauma ,Child abuse ,Trends ,Secondary data ,Medical emergencies. Critical care. Intensive care. First aid ,RC86-88.9 ,Public aspects of medicine ,RA1-1270 - Abstract
Abstract Objective To investigate national trends of SBS diagnosis codes and how trends varied among patient and hospital characteristics. Methods We examined possible SBS, confirmed SBS, and non-SBS abuse diagnosis codes among children age three and younger who were hospitalized for abuse between 1998 and 2014 using a secondary analysis of the National Inpatient Sample, the largest US all-payer inpatient care database (N = 66,854). A baseline category logit model was used based on a quasi-likelihood approach (QIC) with an independent working correlation structure. Results The rate (per 100,000 census population of children age 3 and younger) of confirmed and possible SBS diagnosis codes was 5.4 (± 0.3) between 1998 and 2014, whereas the rate of non-SBS abuse was 19.6 (± 1.0). The rate of confirmed SBS diagnosis codes increased from 3.8 (± 0.3) in 1998 to 5.1 (± 0.9) in 2005, and decreased to 1.3 (± 0.2) in 2014. Possible SBS diagnosis codes were 0.6 (± 0.2) in 1998, increasing to 2.4 (± 0.4) in 2014. Confirmed SBS diagnosis codes have declined since 2002, while possible SBS diagnosis codes have increased. All abuse types were more frequent among infants, males, children from low-income homes, and urban teaching hospitals. Conclusions We investigated seventeen-year trends of SBS diagnosis codes among young children hospitalized for abuse. The discrepancy between trends in possible and confirmed SBS diagnosis codes suggests differences in norms for utilizing SBS diagnosis codes, which has implications for which hospital admissions are coded as AHT. Future research should investigate processes for using SBS diagnosis codes and whether all codes associated with abusive head injuries in young children are classified as AHT. Our findings also highlight the relativity defining and applying SBS diagnosis codes to children admitted to the hospital for shaking injuries. Medical professionals find utility in using SBS diagnosis codes, though may be more apt to apply codes related to possible SBS diagnosis codes in children presenting with abusive head injuries. Clarifying norms for SBS diagnosis codes and refining definitions for AHT diagnosis will ensure that young children presenting with, and coded for, abusive head injuries are included in overall counts of AHT based on secondary data of diagnosis codes. This baseline data, an essential component of child abuse surveillance, will enable ongoing efforts to track, prevent, and reduce child abuse.
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- 2021
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10. Hippocampal neurons respond to brain activity with functional hypoxia
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Butt, Umer Javed, Steixner-Kumar, Agnes A., Depp, Constanze, Sun, Ting, Hassouna, Imam, Wüstefeld, Liane, Arinrad, Sahab, Zillmann, Matthias R., Schopf, Nadine, Fernandez Garcia-Agudo, Laura, Mohrmann, Leonie, Bode, Ulli, Ronnenberg, Anja, Hindermann, Martin, Goebbels, Sandra, Bonn, Stefan, Katschinski, Dörthe M., Miskowiak, Kamilla W., Nave, Klaus-Armin, and Ehrenreich, Hannelore
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- 2021
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11. Multiple inducers and novel roles of autoantibodies against the obligatory NMDAR subunit NR1: a translational study from chronic life stress to brain injury
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Pan, Hong, Steixner-Kumar, Agnes A., Seelbach, Anna, Deutsch, Nadine, Ronnenberg, Anja, Tapken, Daniel, von Ahsen, Nico, Mitjans, Marina, Worthmann, Hans, Trippe, Ralf, Klein-Schmidt, Christina, Schopf, Nadine, Rentzsch, Kristin, Begemann, Martin, Wienands, Jürgen, Stöcker, Winfried, Weissenborn, Karin, Hollmann, Michael, Nave, Klaus-Armin, Lühder, Fred, and Ehrenreich, Hannelore
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- 2021
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12. Corrigendum: Global Patterns of the Fungal Pathogen Batrachochytrium dendrobatidis Support Conservation Urgency
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Deanna H. Olson, Kathryn L. Ronnenberg, Caroline K. Glidden, Kelly R. Christiansen, and Andrew R. Blaustein
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amphibian chytrid ,Bd ,climate associations ,emerging infectious disease ,fungal pathogen ,Veterinary medicine ,SF600-1100 - Published
- 2022
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13. Empirical development of parsimonious model for international diffusion of residential solar
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Williams, Eric, Carvalho, Rexon, Hittinger, Eric, and Ronnenberg, Matthew
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- 2020
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14. The modulating effect of food composition on the immune system in growing ring-necked pheasants (Phasianus colchicus).
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Friederike Gethöffer, Jennifer Liebing, Katrin Ronnenberg, Nele Curland, Christina Puff, Peter Wohlsein, Wolfgang Baumgärtner, Bianca Bücking, Ursula Heffels-Redmann, Ulrich Voigt, Christian Sonne, Michael Lierz, and Ursula Siebert
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Medicine ,Science - Abstract
The decline in the population of ring-necked pheasants (Phasianus colchicus) in northwestern Germany since 2007 raises questions about the underlying causes. We therefore studied the growth and immune status of ring-necked pheasant chicks dependent on different feed composition. Here, 490 ring-necked pheasant chicks were raised in five groups up to nine weeks. While control groups C1 and C2 received sufficient crude protein (28%) and energy (12.5 MJ/Kg feed) according to current standards, group C2 was treated with cyclosporine eight hours prior to phythemagglutination (PHA) testing, serving as a positive immune suppressed control. Group V1 was fed with reduced protein (20%) but optimal energy content (12.5 MJ/Kg feed), group V2 was fed with sufficient protein (28%) and reduced energy content (10 MJ/kg feed) whereas group V3 was fed reduced crude protein (20%) and reduced energy content (10MJ/kg feed). On all chicks, health status was checked each week, and 20 birds of each group were weighed randomly per week. PHA-testing was performed on 12 birds of each group to study the in vivo non-specific activation of lymphocytes at week 2, 4, 6, 7, 8 and 9. In addition, hemolysis-hemagglutination-assay (HHA) was performed on each of the PHA-tested chicks, which were subsequently euthanized and dissected. Histopathologic examinations of 5 birds that were randomly chosen were performed. The PHA-test results demonstrate significant differences between control (C1, C2) and experimental groups (V1-V3) in several developmental stages. According to the HHA results, weekly testing detected a significant increase of titres per week in all groups without significant differences. Here, only hemagglutination and no lysis of samples was observed. It seems appropriate to conclude that during their first weeks of life, protein content is of higher importance in ring-necked pheasant chicks than energy intake. In particular T-cell response is significantly reduced, which indicate a weaker immune system resulting in a higher risk for clinical diseases. Therefore, we assume that protein i.e. insect availability is a highly important co-factor in the free-ranging population dynamics, and is linked to declines of the northwestern German population.
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- 2022
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15. Trends in shaken baby syndrome diagnosis codes among young children hospitalized for abuse
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Conrad, Aislinn, Butcher, Brandon, Oral, Resmiye, Ronnenberg, Megan, and Peek-Asa, Corinne
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- 2021
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16. Tracking, Synthesizing, and Sharing Global Batrachochytrium Data at AmphibianDisease.org
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Michelle S. Koo, Vance T. Vredenburg, John B. Deck, Deanna H. Olson, Kathryn L. Ronnenberg, and David B. Wake
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DarwinCore standards ,amphibia ,chytridiomycosis ,MIxS standards ,Bd ,biodiversity informatics infrastructure ,Veterinary medicine ,SF600-1100 - Abstract
Emerging infectious diseases have been especially devastating to amphibians, the most endangered class of vertebrates. For amphibians, the greatest disease threat is chytridiomycosis, caused by one of two chytridiomycete fungal pathogens Batrachochytrium dendrobatidis (Bd) and Batrachochytrium salamandrivorans (Bsal). Research over the last two decades has shown that susceptibility to this disease varies greatly with respect to a suite of host and pathogen factors such as phylogeny, geography (including abiotic factors), host community composition, and historical exposure to pathogens; yet, despite a growing body of research, a comprehensive understanding of global chytridiomycosis incidence remains elusive. In a large collaborative effort, Bd-Maps was launched in 2007 to increase multidisciplinary investigations and understanding using compiled global Bd occurrence data (Bsal was not discovered until 2013). As its database functions aged and became unsustainable, we sought to address critical needs utilizing new technologies to meet the challenges of aggregating data to facilitate research on both Bd and Bsal. Here, we introduce an advanced central online repository to archive, aggregate, and share Bd and Bsal data collected from around the world. The Amphibian Disease Portal (https://amphibiandisease.org) addresses several critical community needs while also helping to build basic biological knowledge of chytridiomycosis. This portal could be useful for other amphibian diseases and could also be replicated for uses with other wildlife diseases. We show how the Amphibian Disease Portal provides: (1) a new repository for the legacy Bd-Maps data; (2) a repository for sample-level data to archive datasets and host published data with permanent DOIs; (3) a flexible framework to adapt to advances in field, laboratory, and informatics technologies; and (4) a global aggregation of Bd and Bsal infection data to enable and accelerate research and conservation. The new framework for this project is built using biodiversity informatics best practices and metadata standards to ensure scientific reproducibility and linkages across other biological and biodiversity repositories.
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- 2021
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17. Global Patterns of the Fungal Pathogen Batrachochytrium dendrobatidis Support Conservation Urgency
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Deanna H. Olson, Kathryn L. Ronnenberg, Caroline K. Glidden, Kelly R. Christiansen, and Andrew R. Blaustein
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amphibian chytrid ,Bd ,climate associations ,emerging infectious disease ,fungal pathogen ,Veterinary medicine ,SF600-1100 - Abstract
The amphibian chytrid fungus Batrachochytrium dendrobatidis (Bd) is a skin pathogen that can cause the emerging infectious disease chytridiomycosis in susceptible species. It has been considered one of the most severe threats to amphibian biodiversity. We aimed to provide an updated compilation of global Bd occurrences by host taxon and geography, and with the larger global Bd dataset we reanalyzed Bd associations with environmental metrics at the world and regional scales. We also compared our Bd data compilation with a recent independent assessment to provide a more comprehensive count of species and countries with Bd occurrences. Bd has been detected in 1,375 of 2,525 (55%) species sampled, more than doubling known species infections since 2013. Bd occurrence is known from 93 of 134 (69%) countries at this writing; this compares to known occurrences in 56 of 82 (68%) countries in 2013. Climate-niche space is highly associated with Bd detection, with different climate metrics emerging as key predictors of Bd occurrence at regional scales; this warrants further assessment relative to climate-change projections. The accretion of Bd occurrence reports points to the common aims of worldwide investigators to understand the conservation concerns for amphibian biodiversity in the face of potential disease threat. Renewed calls for better mitigation of amphibian disease threats resonate across continents with amphibians, especially outside Asia. As Bd appears to be able to infect about half of amphibian taxa and sites, there is considerable room for biosecurity actions to forestall its spread using both bottom-up community-run efforts and top-down national-to-international policies. Conservation safeguards for sensitive species and biodiversity refugia are continuing priorities.
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- 2021
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18. Habitat requirements of the European brown hare (Lepus europaeus Pallas 1778) in an intensively used agriculture region (Lower Saxony, Germany)
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Katharina Sliwinski, Katrin Ronnenberg, Klaus Jung, Egbert Strauß, and Ursula Siebert
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Wildlife estimation ,Citizen science ,Monitoring ,Hunting bags ,Land use data ,Small game ,Ecology ,QH540-549.5 - Abstract
Abstract Background The European brown hare (Lepus europaeus) typically resides in open habitats in agriculturally dominated landscapes in Europe. Over recent decades, a widely observed population decline occurred, which was attributed to agricultural intensification. However, with political incentives for specific crops, especially maize for energy production, the habitat went through massive changes. Thus, there is the need to identify parameters that characterize a suitable habitat for the brown hare in today’s agricultural lands. Results We modelled European brown hare densities spatially and temporally explicit over 10 years (2005–2014) across an entire federal state. The generalized additive mixed model confirms a constant decline of the European brown hare population in Lower Saxony. Municipalities with a high proportion of grassland and precipitation totaling up to 900 mm are more favored. Woodland showed an approximately linear negative effect. The most important agricultural crop groups such as winter grains and winter oilseed rape showed overall positive effects on hare densities. However, the effect of maize was unimodal, with a positive effect of medium proportions, but a negative effect of very high proportions. The effect of sugar beet was relatively weak but negative. Brown hares were also more abundant in municipalities with a higher density of vixen with litter and municipalities with a high proportion of wildflower strips showed higher brown hare abundance. Conclusion Lower Saxony is a diverse federal state with grassland dominated areas in the northwest, more woodland in the east, but intensive arable land in most remaining areas. The European brown hare—a species with a wide ecological potency—shows preferences to both grassland and the most typical arable crop groups such as winter grains and winter oilseed rape. The substantial increase in maize production within the time frame was likely unfavourable and may be one reason for the decline. Nonetheless, political tools such as the agri-environmental scheme “wildflower strips” were beneficial for the brown hare abundance and may be an option to reverse the decline seen over the 10 years.
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- 2019
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19. Barriers to Exclusive Breastfeeding Among Women With Gestational Diabetes Mellitus in the United States
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Doughty, Kimberly N., Ronnenberg, Alayne G., Reeves, Katherine W., Qian, Jing, and Sibeko, Lindiwe
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- 2018
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20. Cognitive, emotional and social phenotyping of mice in an observer-independent setting
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Dere, Ekrem, Ronnenberg, Anja, Tampe, Björn, Arinrad, Sahab, Schmidt, Manuela, Zeisberg, Elisabeth, and Ehrenreich, Hannelore
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- 2018
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21. Uncoupling the widespread occurrence of anti-NMDAR1 autoantibodies from neuropsychiatric disease in a novel autoimmune model
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Pan, Hong, Oliveira, Bárbara, Saher, Gesine, Dere, Ekrem, Tapken, Daniel, Mitjans, Marina, Seidel, Jan, Wesolowski, Janina, Wakhloo, Debia, Klein-Schmidt, Christina, Ronnenberg, Anja, Schwabe, Kerstin, Trippe, Ralf, Mätz-Rensing, Kerstin, Berghoff, Stefan, Al-Krinawe, Yazeed, Martens, Henrik, Begemann, Martin, Stöcker, Winfried, Kaup, Franz-Josef, Mischke, Reinhard, Boretius, Susann, Nave, Klaus-Armin, Krauss, Joachim K., Hollmann, Michael, Lühder, Fred, and Ehrenreich, Hannelore
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- 2019
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22. Impact of Vitamin A and Carotenoids on the Risk of Tuberculosis Progression
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Aibana, Omowunmi, Franke, Molly F., Huang, Chuan-Chin, Galea, Jerome T., Calderon, Roger, Zhang, Zibiao, Becerra, Mercedes C., Smith, Emily R., Ronnenberg, Alayne G., Contreras, Carmen, Yataco, Rosa, Lecca, Leonid, and Murray, Megan B.
- Published
- 2017
23. Examining Library Staff Openness to Social Work Collaboration: The Role of Empowerment and Resilience.
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Addison, Saige M., Gilster, Megan E., Ronnenberg, Megan, Logsden, Kara, and Witry, Sarah
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PSYCHOLOGICAL resilience , *SELF-efficacy , *HOUSING stability , *PSYCHOLOGICAL burnout , *LIBRARY personnel - Abstract
AbstractPublic library staff increasingly assist patrons with psychosocial needs (e.g. food or housing insecurity). To address growing demands for psychosocial support, libraries are engaging in social work (SW) collaborations; however, successful collaborations depend on library staff’s openness to intervention. This quantitative study examines the relationship between burnout and openness to SW collaboration, and whether resilience and empowerment protect against burnout. Results show that career resilience mediates the relationship between psychological empowerment and burnout. Burnout was not associated with openness to SW collaboration. Findings suggest resilience plays a role in preventing burnout, and that library staff are open to SW collaborations. [ABSTRACT FROM AUTHOR]
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- 2024
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24. CaMKIIα Expressing Neurons to Report Activity-Related Endogenous Hypoxia upon Motor-Cognitive Challenge
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Umer Javed Butt, Imam Hassouna, Laura Fernandez Garcia-Agudo, Agnes A. Steixner-Kumar, Constanze Depp, Nadine Barnkothe, Matthias R. Zillmann, Anja Ronnenberg, Viktoria Bonet, Sandra Goebbels, Klaus-Armin Nave, and Hannelore Ehrenreich
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physiological hypoxia ,complex running wheel ,hippocampus ,scRNA-seq ,light-sheet microscopy ,Hif-1α ,Biology (General) ,QH301-705.5 ,Chemistry ,QD1-999 - Abstract
We previously introduced the brain erythropoietin (EPO) circle as a model to explain the adaptive ‘brain hardware upgrade’ and enhanced performance. In this fundamental circle, brain cells, challenged by motor-cognitive tasks, experience functional hypoxia, triggering the expression of EPO among other genes. We attested hypoxic cells by a transgenic reporter approach under the ubiquitous CAG promoter, with Hif-1α oxygen-dependent degradation-domain (ODD) fused to CreERT2-recombinase. To specifically focus on the functional hypoxia of excitatory pyramidal neurons, here, we generated CaMKIIα-CreERT2-ODD::R26R-tdTomato mice. Behavioral challenges, light-sheet microscopy, immunohistochemistry, single-cell mRNA-seq, and neuronal cultures under normoxia or hypoxia served to portray these mice. Upon complex running wheel performance as the motor-cognitive task, a distinct increase in functional hypoxic neurons was assessed immunohistochemically and confirmed three-dimensionally. In contrast, fear conditioning as hippocampal stimulus was likely too short-lived to provoke neuronal hypoxia. Transcriptome data of hippocampus under normoxia versus inspiratory hypoxia revealed increases in CA1 CaMKIIα-neurons with an immature signature, characterized by the expression of Dcx, Tbr1, CaMKIIα, Tle4, and Zbtb20, and consistent with accelerated differentiation. The hypoxia reporter response was reproduced in vitro upon neuronal maturation. To conclude, task-associated activity triggers neuronal functional hypoxia as a local and brain-wide reaction mediating adaptive neuroplasticity. Hypoxia-induced genes such as EPO drive neuronal differentiation, brain maturation, and improved performance.
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- 2021
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25. Habitat requirements of the European brown hare (Lepus europaeus Pallas 1778) in an intensively used agriculture region (Lower Saxony, Germany)
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Sliwinski, Katharina, Ronnenberg, Katrin, Jung, Klaus, Strauß, Egbert, and Siebert, Ursula
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- 2019
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26. Loss of the parkinsonism‐associated protein FBXO7 in glutamatergic forebrain neurons in mice leads to abnormal motor behavior and synaptic defects.
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Wang, Jingbo, Joseph, Sabitha, Vingill, Siv, Dere, Ekrem, Tatenhorst, Lars, Ronnenberg, Anja, Lingor, Paul, Preisinger, Christian, Ehrenreich, Hannelore, Schulz, Jörg B., and Stegmüller, Judith
- Subjects
PYRAMIDAL tract ,PROSENCEPHALON ,NEURONS ,DOPAMINERGIC neurons ,PARKINSONIAN disorders ,MICE ,COMPLEMENT activation - Abstract
Mutations in PARK15, which encodes for the F‐box protein FBXO7 have been associated with Parkinsonian Pyramidal syndrome, a rare and complex movement disorder with Parkinsonian symptoms, pyramidal tract signs and juvenile onset. Our previous study showed that systemic loss of Fbxo7 in mice causes motor defects and premature death. We have also demonstrated that FBXO7 has a crucial role in neurons as the specific deletion in tyrosine hydroxylase‐positive or glutamatergic forebrain neurons leads to late‐onset or early‐onset motor dysfunction, respectively. In this study, we examined NEX‐Cre;Fbxo7fl/fl mice, in which Fbxo7 was specifically deleted in glutamatergic projection neurons. The effects of FBXO7 deficiency on striatal integrity were investigated with HPLC and histological analyses. NEX‐Cre;Fbxo7fl/fl mice revealed an increase in striatal dopamine concentrations, changes in the glutamatergic, GABAergic and dopaminergic pathways, astrogliosis and microgliosis and little or no neuronal loss in the striatum. To determine the effects on the integrity of the synapse, we purified synaptic membranes, subjected them to quantitative mass spectrometry analysis and found alterations in the complement system, endocytosis and exocytosis pathways. These neuropathological changes coincide with alterations in spontaneous home cage behavior. Taken together, our findings suggest that FBXO7 is crucial for corticostriatal projections and the synaptic integrity of the striatum, and consequently for proper motor control. [ABSTRACT FROM AUTHOR]
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- 2023
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27. Ablation of BAF170 in Developing and Postnatal Dentate Gyrus Affects Neural Stem Cell Proliferation, Differentiation, and Learning
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Tuoc, Tran, Dere, Ekrem, Radyushkin, Konstantin, Pham, Linh, Nguyen, Huong, Tonchev, Anton B., Sun, Guoqiang, Ronnenberg, Anja, Shi, Yanhong, Staiger, Jochen F., Ehrenreich, Hannelore, and Stoykova, Anastassia
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- 2017
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28. The modulating effect of food composition on the immune system in growing ring-necked pheasants (Phasianus colchicus)
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Gethöffer, Friederike, Liebing, Jennifer, Ronnenberg, Katrin, Curland, Nele, Puff, Christina, Wohlsein, Peter, Baumgärtner, Wolfgang, Bücking, Bianca, Heffels-Redmann, Ursula, Voigt, Ulrich, Sonne, Christian, Lierz, Michael, and Siebert, Ursula
- Abstract
The decline in the population of ring-necked pheasants (Phasianus colchicus) in northwestern Germany since 2007 raises questions about the underlying causes. We therefore studied the growth and immune status of ring-necked pheasant chicks dependent on different feed composition. Here, 490 ring-necked pheasant chicks were raised in five groups up to nine weeks. While control groups C1 and C2 received sufficient crude protein (28%) and energy (12.5 MJ/Kg feed) according to current standards, group C2 was treated with cyclosporine eight hours prior to phythemagglutination (PHA) testing, serving as a positive immune suppressed control. Group V1 was fed with reduced protein (20%) but optimal energy content (12.5 MJ/Kg feed), group V2 was fed with sufficient protein (28%) and reduced energy content (10 MJ/kg feed) whereas group V3 was fed reduced crude protein (20%) and reduced energy content (10MJ/kg feed). On all chicks, health status was checked each week, and 20 birds of each group were weighed randomly per week. PHA-testing was performed on 12 birds of each group to study the in vivo non-specific activation of lymphocytes at week 2, 4, 6, 7, 8 and 9. In addition, hemolysis–hemagglutination–assay (HHA) was performed on each of the PHA-tested chicks, which were subsequently euthanized and dissected. Histopathologic examinations of 5 birds that were randomly chosen were performed. The PHA–test results demonstrate significant differences between control (C1, C2) and experimental groups (V1-V3) in several developmental stages. According to the HHA results, weekly testing detected a significant increase of titres per week in all groups without significant differences. Here, only hemagglutination and no lysis of samples was observed. It seems appropriate to conclude that during their first weeks of life, protein content is of higher importance in ring-necked pheasant chicks than energy intake. In particular T-cell response is significantly reduced, which indicate a weaker immune system resulting in a higher risk for clinical diseases. Therefore, we assume that protein i.e. insect availability is a highly important co-factor in the free-ranging population dynamics, and is linked to declines of the northwestern German population.
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- 2022
29. Inducing sterile pyramidal neuronal death in mice to model distinct aspects of gray matter encephalitis
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Susann Boretius, Martin Hindermann, Umer Javed Butt, Jan Seidel, Klaus-Armin Nave, Sahab Arinrad, Svenja Zihsler, Rüdiger Hardeland, Stefan A. Berghoff, Anja Ronnenberg, Aref Kalantari Sarcheshmeh, Justus B H Wilke, Amir Moussavi, Hannelore Ehrenreich, Rakshit Dadarwal, and Fred Lühder
- Subjects
0301 basic medicine ,Male ,medicine.medical_specialty ,Neurology ,Population ,Morris water navigation task ,Hippocampus ,Hippocampal formation ,Pathology and Forensic Medicine ,(pre)frontal network dysfunction ,03 medical and health sciences ,Cellular and Molecular Neuroscience ,Mice ,0302 clinical medicine ,Magnetic resonance imaging ,medicine ,Animals ,Gray Matter ,education ,RC346-429 ,education.field_of_study ,business.industry ,Research ,Pyramidal Cells ,Neurodegeneration ,medicine.disease ,Social cognition ,Mice, Inbred C57BL ,Disease Models, Animal ,030104 developmental biology ,Cerebral blood flow ,Thermography ,Encephalitis ,Hippocampal learning and memory ,Neurology (clinical) ,Diphtheria toxin ,Neurology. Diseases of the nervous system ,business ,Neuroscience ,030217 neurology & neurosurgery - Abstract
Up to one person in a population of 10,000 is diagnosed once in lifetime with an encephalitis, in 50–70% of unknown origin. Recognized causes amount to 20–50% viral infections. Approximately one third of affected subjects develops moderate and severe subsequent damage. Several neurotropic viruses can directly infect pyramidal neurons and induce neuronal death in cortex and hippocampus. The resulting encephalitic syndromes are frequently associated with cognitive deterioration and dementia, but involve numerous parallel and downstream cellular and molecular events that make the interpretation of direct consequences of sudden pyramidal neuronal loss difficult. This, however, would be pivotal for understanding how neuroinflammatory processes initiate the development of neurodegeneration, and thus for targeted prophylactic and therapeutic interventions. Here we utilized adult male NexCreERT2xRosa26-eGFP-DTA (= ‘DTA’) mice for the induction of a sterile encephalitis by diphtheria toxin-mediated ablation of cortical and hippocampal pyramidal neurons which also recruits immune cells into gray matter. We report multifaceted aftereffects of this defined process, including the expected pathology of classical hippocampal behaviors, evaluated in Morris water maze, but also of (pre)frontal circuit function, assessed by prepulse inhibition. Importantly, we modelled in encephalitis mice novel translationally relevant sequelae, namely altered social interaction/cognition, accompanied by compromised thermoreaction to social stimuli as convenient readout of parallel autonomic nervous system (dys)function. High resolution magnetic resonance imaging disclosed distinct abnormalities in brain dimensions, including cortical and hippocampal layering, as well as of cerebral blood flow and volume. Fluorescent tracer injection, immunohistochemistry and brain flow cytometry revealed persistent blood–brain-barrier perturbance and chronic brain inflammation. Surprisingly, blood flow cytometry showed no abnormalities in circulating major immune cell subsets and plasma high-mobility group box 1 (HMGB1) as proinflammatory marker remained unchanged. The present experimental work, analyzing multidimensional outcomes of direct pyramidal neuronal loss, will open new avenues for urgently needed encephalitis research. Supplementary Information The online version contains supplementary material available at 10.1186/s40478-021-01214-6.
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- 2021
30. Immune-relevant and new xenobiotic molecular biomarkers to assess anthropogenic stress in seals
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Weirup, Lina, Müller, Sabine, Ronnenberg, Katrin, Rosenberger, Tanja, Siebert, Ursula, and Lehnert, Kristina
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- 2013
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31. Xenobiotic and Immune-Relevant Molecular Biomarkers in Harbor Seals as Proxies for Pollutant Burden and Effects
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Lehnert, Kristina, Ronnenberg, Katrin, Weijs, Liesbeth, Covaci, Adrian, Das, Krishna, Hellwig, Veronika, and Siebert, Ursula
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- 2016
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32. The important role of change management in environmental management system implementation
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Ronnenberg, Shannon K., Graham, Mary E., and Mahmoodi, Farzad
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- 2011
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33. Genetic Markers of a Munc13 Protein Family Member, BAIAP3, Are Gender Specifically Associated with Anxiety and Benzodiazepine Abuse in Mice and Humans
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Sonja M. Wojcik, Martesa Tantra, Beata Stepniak, Kwun-nok M. Man, Katja Müller-Ribbe, Martin Begemann, Anes Ju, Sergi Papiol, Anja Ronnenberg, Artem Gurvich, Yong Shin, Iris Augustin, Nils Brose, and Hannelore Ehrenreich
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Benzodiazepine Abuse ,Striking Expression Pattern ,Diazepam Withdrawal ,Hypothalamic Slices ,Increased Seizure Propensity ,Therapeutics. Pharmacology ,RM1-950 ,Biochemistry ,QD415-436 - Abstract
Abstract Anxiety disorders and substance abuse, including benzodiazepine use disorder, frequently occur together. Unfortunately, treatment of anxiety disorders still includes benzodiazepines, and patients with an existing comorbid benzodiazepine use disorder or a genetic susceptibility for benzodiazepine use disorder may be at risk of adverse treatment outcomes. The identification of genetic predictors for anxiety disorders, and especially for benzodiazepine use disorder, could aid the selection of the best treatment option and improve clinical outcomes. The brain-specific angiogenesis inhibitor I-associated protein 3 (Baiap3) is a member of the mammalian uncoordinated 13 (Munc13) protein family of synaptic regulators of neurotransmitter exocytosis, with a striking expression pattern in amygdalae, hypothalamus and periaqueductal gray. Deletion of Baiap3 in mice leads to enhanced seizure propensity and increased anxiety, with the latter being more pronounced in female than in male animals. We hypothesized that genetic variation in human BAIAP3 may also be associated with anxiety. By using a phenotype-based genetic association study, we identified two human BAIAP3 single-nucleotide polymorphism risk genotypes (AA for rs2235632, TT for rs1132358) that show a significant association with anxiety in women and, surprisingly, with benzodiazepine abuse in men. Returning to mice, we found that male, but not female, Baiap3 knockout (KO) mice develop tolerance to diazepam more quickly than control animals. Analysis of cultured Baiap3 KO hypothalamus slices revealed an increase in basal network activity and an altered response to diazepam withdrawal. Thus, Baiap3/BAIAP3 is gender specifically associated with anxiety and benzodiazepine use disorder, and the analysis of Baiap3/BAIAP3-related functions may help elucidate mechanisms underlying the development of both disorders.
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- 2013
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34. Isolated catatonia-like executive dysfunction in mice with forebrain-specific loss of myelin integrity.
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Arinrad, Sahab, Depp, Constanze, Siems, Sophie B., Sasmita, Andrew Octavian, Eichel, Maria A., Ronnenberg, Anja, Hammerschmidt, Kurt, Lüders, Katja A., Werner, Hauke B., Ehrenreich, Hannelore, and Nave, Klaus-Armin
- Published
- 2023
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35. Effects of fertilization and irrigation on productivity, plant nutrient contents and soil nutrients in southern Mongolia
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Ronnenberg, Katrin and Wesche, Karsten
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- 2011
36. Variation of blubber thickness for three marine mammal species in the southern Baltic Sea
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Siebert, Ursula, Grilo, Miguel L., Kesselring, Tina, Lehnert, Kristina, Ronnenberg, Katrin, Pawliczka, Iwona, Galatius, Anders, Kyhn, Line A., Dähne, Michael, and Gilles, Anita
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Harbor porpoises ,Natural variations ,Physiology ,Harbor seals ,Physiology (medical) ,Grey seals ,HELCOM area ,Blubber thickness - Abstract
Evaluating populational trends of health condition has become an important topic for marine mammal populations under the Marine Strategy Framework Directive (MSFD). In the Baltic Sea, under the recommendation of Helsinki Commission (HELCOM), efforts have been undertaken to use blubber thickness as an indicator of energy reserves in marine mammals. Current values lack geographical representation from the entire Baltic Sea area and a large dataset is only available for grey seals (Halichoerus grypus) from Sweden and Finland. Knowledge on variation of blubber thickness related to geography throughout the Baltic Sea is important for its usage as an indicator. Such evaluation can provide important information about the energy reserves, and hence, food availability. It is expected that methodological standardization under HELCOM should include relevant datasets with good geographical coverage that can also account for natural variability in the resident marine mammal populations. In this study, seasonal and temporal trends of blubber thickness were evaluated for three marine mammal species—harbor seal (Phoca vitulina), grey seal (Halichoerus grypus) and harbor porpoise (Phocoena phocoena)—resident in the southern Baltic Sea collected and investigated under stranding networks. Additionally, the effects of age, season and sex were analyzed. Seasonal variation of blubber thickness was evident for all species, with harbor seals presenting more pronounced effects in adults and grey seals and harbor porpoises presenting more pronounced effects in juveniles. For harbor seals and porpoises, fluctuations were present over the years included in the analysis. In the seal species, blubber thickness values were generally higher in males. In harbor seals and porpoises, blubber thickness values differed between the age classes: while adult harbor seals displayed thicker blubber layers than juveniles, the opposite was observed for harbor porpoises. Furthermore, while an important initial screening tool, blubber thickness assessment cannot be considered a valid methodology for overall health assessment in marine mammals and should be complemented with data on specific health parameters developed for each species info:eu-repo/semantics/publishedVersion
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- 2022
37. Effects of NPK Fertilisation in Arid Southern Mongolian Desert Steppes
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Wesche, K. and Ronnenberg, K.
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- 2010
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38. Vascular response to social cognitive performance measured by infrared thermography: A translational study from mouse to man
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Jan Seidel, Annekathrin Schacht, Heiko Röhse, Hannelore Ehrenreich, Anja Ronnenberg, Miso Mitkovski, Fabian Bockhop, Dilja Krueger-Burg, Filippo Cosi, Katharina Schneider, Sabine Martin, Liane Wüstefeld, and Kai Bröking
- Subjects
Cancer Research ,medicine.medical_specialty ,Physiology ,IRT ,Audiology ,Biochemistry, Genetics and Molecular Biology (miscellaneous) ,Social preferences ,Facial recognition system ,vasoactivity ,03 medical and health sciences ,flushing ,stress ,0302 clinical medicine ,medicine ,Effects of sleep deprivation on cognitive performance ,lcsh:QH301-705.5 ,Research Articles ,030304 developmental biology ,0303 health sciences ,business.industry ,social stimulus ,temperature ,Cognitive test ,lcsh:Biology (General) ,Thermography ,Pattern recognition (psychology) ,Molecular Medicine ,business ,030217 neurology & neurosurgery ,Social cognitive theory ,Social behavior ,Research Article - Abstract
To assess complex social recognition in mice, we previously developed the SocioBox paradigm. Unexpectedly, 4 weeks after performing in the SocioBox, mice displayed robust social avoidance during Y‐maze sociability testing. This unique “sociophobia” acquisition could be documented in independent cohorts. We therefore employed infrared thermography as a non‐invasive method of stress‐monitoring during SocioBox testing (presentation of five other mice) versus empty box. A higher Centralization Index (body/tail temperature) in the SocioBox correlated negatively with social recognition memory and, after 4 weeks, with social preference in the Y‐maze. Assuming that social stimuli might be associated with characteristic thermo‐responses, we exposed healthy men (N = 103) with a comparably high intelligence level to a standardized test session including two cognitive tests with or without social component (face versus pattern recognition). In some analogy to the Centralization Index (within‐subject measure) used in mice, the Reference Index (ratio nose/malar cheek temperature) was introduced to determine the autonomic facial response/flushing during social recognition testing. Whereas cognitive performance and salivary cortisol were comparable across human subjects and tests, the Face Recognition Test was associated with a characteristic Reference Index profile. Infrared thermography may have potential for discriminating disturbed social behaviors.
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- 2019
39. Predictive Mapping of Plant Species and Communities Using GIS and Landsat Data in a Southern Mongolian Mountain Range
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von Wehrden, Henrik, Zimmermann, Heike, Hanspach, Jan, Ronnenberg, Katrin, and Wesche, Karsten
- Published
- 2009
40. Germination Ecology of Central Asian Stipa Spp: Differences among Species, Seed Provenances, and the Importance of Field Studies
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Ronnenberg, Katrin, Wesche, Karsten, and Hensen, Isabell
- Published
- 2008
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41. Reduced Social Interaction and Ultrasonic Communication in a Mouse Model of Monogenic Heritable Autism
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Jamain, Stephane, Radyushkin, Konstantin, Hammerschmidt, Kurt, Granon, Sylvie, Boretius, Susann, Varoqueaux, Frederique, Ramanantsoa, Nelina, Gallego, Jorge, Ronnenberg, Anja, Winter, Dorina, Frahm, Jens, Fischer, Julia, Bourgeron, Thomas, Ehrenreich, Hannelore, and Brose, Nils
- Published
- 2008
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42. Dietary B vitamin intake and incident premenstrual syndrome
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Chocano-Bedoya, Patricia O, Manson, JoAnn E, Hankinson, Susan E, Willett, Walter C, Johnson, Susan R, Chasan-Taber, Lisa, Ronnenberg, Alayne G, Bigelow, Carol, and Bertone-Johnson, Elizabeth R
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- 2011
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43. Tracking, Synthesizing, and Sharing Global Batrachochytrium Data at AmphibianDisease.org
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Vance T. Vredenburg, Michelle S. Koo, John Deck, Deanna H. Olson, David B. Wake, and Kathryn L. Ronnenberg
- Subjects
General Veterinary ,Emerging technologies ,Veterinary medicine ,Biodiversity ,Wildlife ,Batrachochytrium salamandrivorans ,Biodiversity informatics ,Data science ,amphibia ,Bd ,Metadata ,chytridiomycosis ,medicine.drug_formulation_ingredient ,Geography ,DarwinCore standards ,MIxS standards ,biodiversity informatics infrastructure ,Informatics ,SF600-1100 ,medicine ,Chytridiomycosis - Abstract
Emerging infectious diseases have been especially devastating to amphibians, the most endangered class of vertebrates. For amphibians, the greatest disease threat is chytridiomycosis, caused by one of two chytridiomycete fungal pathogens Batrachochytrium dendrobatidis (Bd) and Batrachochytrium salamandrivorans (Bsal). Research over the last two decades has shown that susceptibility to this disease varies greatly with respect to a suite of host and pathogen factors such as phylogeny, geography (including abiotic factors), host community composition, and historical exposure to pathogens; yet, despite a growing body of research, a comprehensive understanding of global chytridiomycosis incidence remains elusive. In a large collaborative effort, Bd-Maps was launched in 2007 to increase multidisciplinary investigations and understanding using compiled global Bd occurrence data (Bsal was not discovered until 2013). As its database functions aged and became unsustainable, we sought to address critical needs utilizing new technologies to meet the challenges of aggregating data to facilitate research on both Bd and Bsal. Here, we introduce an advanced central online repository to archive, aggregate, and share Bd and Bsal data collected from around the world. The Amphibian Disease Portal (https://amphibiandisease.org) addresses several critical community needs while also helping to build basic biological knowledge of chytridiomycosis. This portal could be useful for other amphibian diseases and could also be replicated for uses with other wildlife diseases. We show how the Amphibian Disease Portal provides: (1) a new repository for the legacy Bd-Maps data; (2) a repository for sample-level data to archive datasets and host published data with permanent DOIs; (3) a flexible framework to adapt to advances in field, laboratory, and informatics technologies; and (4) a global aggregation of Bd and Bsal infection data to enable and accelerate research and conservation. The new framework for this project is built using biodiversity informatics best practices and metadata standards to ensure scientific reproducibility and linkages across other biological and biodiversity repositories.
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- 2021
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44. Selective expression of a constitutively active erythropoietin receptor in GABAergic neurons alters hippocampal network properties without affecting cognition
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Wüstefeld, Liane, Winkler, Daniela, Janc, Oliwia A., Hassouna, Imam, Ronnenberg, Anja, Ostmeier, Katrin, Müller, Michael, Brose, Nils, Ehrenreich, Hannelore, and Wojcik, Sonja M.
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- 2016
- Full Text
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45. Mortality rates of wild boar Sus scrofa L. in central Europe
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Keuling, Oliver, Baubet, Eric, Duscher, Andreas, Ebert, Cornelia, Fischer, Claude, Monaco, Andrea, Podgórski, Tomasz, Prevot, Céline, Ronnenberg, Katrin, Sodeikat, Gunter, Stier, Norman, and Thurfjell, Henrik
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- 2013
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46. Inter-annual rainfall variability in Central Asia – A contribution to the discussion on the importance of environmental stochasticity in drylands
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von Wehrden, Henrik, Hanspach, Jan, Ronnenberg, Katrin, and Wesche, Karsten
- Published
- 2010
- Full Text
- View/download PDF
47. The Association of Lean Mass and Fat Mass With Peak Bone Mass in Young Premenopausal Women
- Author
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Zagarins, Sofija E., Ronnenberg, Alayne G., Gehlbach, Stephen H., Lin, Rongheng, and Bertone-Johnson, Elizabeth R.
- Published
- 2010
- Full Text
- View/download PDF
48. Autoantibodies against NMDA receptor 1 modify rather than cause encephalitis
- Author
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Agnes A. Steixner-Kumar, Fred Lühder, Stefan Röglin, Klaus-Armin Nave, Winfried Stöcker, Hannelore Ehrenreich, Nadine Barnkothe, Sahab Arinrad, Justus B H Wilke, Stefan A. Berghoff, Svenja Zihsler, Anja Ronnenberg, Martin Hindermann, and Michael Hollmann
- Subjects
0301 basic medicine ,Inflammation ,Hippocampal formation ,Receptors, N-Methyl-D-Aspartate ,Pathogenesis ,03 medical and health sciences ,Cellular and Molecular Neuroscience ,Mice ,0302 clinical medicine ,Atrophy ,medicine ,Animals ,Molecular Biology ,Autoantibodies ,business.industry ,Pyramidal Cells ,Autoantibody ,medicine.disease ,Astrogliosis ,Psychiatry and Mental health ,030104 developmental biology ,Blood-Brain Barrier ,Immunology ,NMDA receptor ,Encephalitis ,medicine.symptom ,business ,030217 neurology & neurosurgery - Abstract
The etiology and pathogenesis of “anti-N-methyl-D-aspartate-receptor (NMDAR) encephalitis” and the role of autoantibodies (AB) in this condition are still obscure. While NMDAR1-AB exert NMDAR-antagonistic properties by receptor internalization, no firm evidence exists to date that NMDAR1-AB by themselves induce brain inflammation/encephalitis. NMDAR1-AB of all immunoglobulin classes are highly frequent across mammals with multiple possible inducers and boosters. We hypothesized that “NMDAR encephalitis” results from any primary brain inflammation coinciding with the presence of NMDAR1-AB, which may shape the encephalitis phenotype. Thus, we tested whether following immunization with a “cocktail” of 4 NMDAR1 peptides, induction of a spatially and temporally defined sterile encephalitis by diphtheria toxin-mediated ablation of pyramidal neurons (“DTA” mice) would modify/aggravate the ensuing phenotype. In addition, we tried to replicate a recent report claiming that immunizing just against the NMDAR1-N368/G369 region induced brain inflammation. Mice after DTA induction revealed a syndrome comprising hyperactivity, hippocampal learning/memory deficits, prefrontal cortical network dysfunction, lasting blood brain-barrier impairment, brain inflammation, mainly in hippocampal and cortical regions with pyramidal neuronal death, microgliosis, astrogliosis, modest immune cell infiltration, regional atrophy, and relative increases in parvalbumin-positive interneurons. The presence of NMDAR1-AB enhanced the hyperactivity (psychosis-like) phenotype, whereas all other readouts were identical to control-immunized DTA mice. Non-DTA mice with or without NMDAR1-AB were free of any encephalitic signs. Replication of the reported NMDAR1-N368/G369-immunizing protocol in two large independent cohorts of wild-type mice completely failed. To conclude, while NMDAR1-AB can contribute to the behavioral phenotype of an underlying encephalitis, induction of an encephalitis by NMDAR1-AB themselves remains to be proven.
- Published
- 2021
49. Multiple inducers and novel roles of autoantibodies against the obligatory NMDAR subunit NR1: a translational study from chronic life stress to brain injury
- Author
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Agnes A. Steixner-Kumar, Winfried Stöcker, Nadine Schopf, Jürgen Wienands, Anna Seelbach, Christina Klein-Schmidt, Nadine R. Deutsch, Anja Ronnenberg, Nico von Ahsen, Hannelore Ehrenreich, Klaus-Armin Nave, Kristin Rentzsch, Karin Weissenborn, Hong Pan, Fred Lühder, Hans Worthmann, Martin Begemann, Marina Mitjans, Daniel Tapken, Ralf Trippe, and Michael Hollmann
- Subjects
0301 basic medicine ,Endogeny ,Disease ,Receptors, N-Methyl-D-Aspartate ,Article ,Lesion ,Mice ,03 medical and health sciences ,Cellular and Molecular Neuroscience ,0302 clinical medicine ,Seroepidemiologic Studies ,Genetic predisposition ,Animals ,Medicine ,Molecular Biology ,Autoantibodies ,Autoimmune disease ,business.industry ,Autoantibody ,medicine.disease ,Phenotype ,Psychiatry and Mental health ,030104 developmental biology ,Blood-Brain Barrier ,Brain Injuries ,Immunology ,NMDA receptor ,medicine.symptom ,business ,Stress, Psychological ,030217 neurology & neurosurgery ,Neuroscience - Abstract
Circulating autoantibodies (AB) of different immunoglobulin classes (IgM, IgA, and IgG), directed against the obligatory N-methyl-d-aspartate-receptor subunit NR1 (NMDAR1-AB), belong to the mammalian autoimmune repertoire, and appear with age-dependently high seroprevalence across health and disease. Upon access to the brain, they can exert NMDAR-antagonistic/ketamine-like actions. Still unanswered key questions, addressed here, are conditions of NMDAR1-AB formation/boosting, intraindividual persistence/course in serum over time, and (patho)physiological significance of NMDAR1-AB in modulating neuropsychiatric phenotypes. We demonstrate in a translational fashion from mouse to human that (1) serum NMDAR1-AB fluctuate upon long-term observation, independent of blood–brain barrier (BBB) perturbation; (2) a standardized small brain lesion in juvenile mice leads to increased NMDAR1-AB seroprevalence (IgM + IgG), together with enhanced Ig-class diversity; (3)CTLA4(immune-checkpoint) genotypes, previously found associated with autoimmune disease, predispose to serum NMDAR1-AB in humans; (4) finally, pursuing our prior findings of an early increase in NMDAR1-AB seroprevalence in human migrants, which implicated chronic life stress as inducer, we independently replicate these results with prospectively recruited refugee minors. Most importantly, we here provide the first experimental evidence in mice of chronic life stress promoting serum NMDAR1-AB (IgA). Strikingly, stress-induced depressive-like behavior in mice and depression/anxiety in humans are reduced in NMDAR1-AB carriers with compromised BBB where NMDAR1-AB can readily reach the brain. To conclude, NMDAR1-AB may have a role as endogenous NMDAR antagonists, formed or boosted under various circumstances, ranging from genetic predisposition to, e.g., tumors, infection, brain injury, and stress, altogether increasing over lifetime, and exerting a spectrum of possible effects, also including beneficial functions.
- Published
- 2021
50. Correlation of urine and plasma cytokine levels among reproductive-aged women
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Nobles, Carrie, Bertone-Johnson, Elizabeth R., Ronnenberg, Alayne G., Faraj, Joyce M., Zagarins, Sofija, Takashima-Uebelhoer, Biki B., and Whitcomb, Brian W.
- Published
- 2015
- Full Text
- View/download PDF
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