Search

Malignant gliomas are rapidly growing tumours that extensively invade the brain and have bad prognosis. Our study was performed to assess the metabolic effects of bevacizumab on the glioma cells carrying the IDH1 mutation, a mutation, associated with better prognosis and treatment outcome. Bevacizumab is known to inhibit tumour growth by neutralizing the biological activity of vascular endothelial growth factor (VEGF). However, the direct effects of bevacizumab on tumour cells metabolism remain poorly known.

Abstract Cladribine tablets (CladT) has been available for therapeutic use in France since March 2021 for the management of highly active relapsing multiple sclerosis (RMS). This high-efficacy disease-modifying therapy (DMT) acts as an immune reconstitution therapy. In contrast to most high-efficacy DMTs, which act via continuous immunosuppression, two short courses of oral treatment with CladT at the beginning of years 1 and 2 of treatment provide long-term control of MS disease activity in responders to treatment, without the need for any further pharmacological treatment for several years. Although the labelling for CladT does not provide guidance beyond the initial treatment courses, real-world data on the therapeutic use of CladT from registries of previous clinical trial participants and patients treated in routine practice indicate that MS disease activity is controlled for a period of years beyond this time for a substantial proportion of patients. Moreover, this clinical experience has provided useful information on how to initiate and manage treatment with CladT. In this article we, a group of expert neurologists from France, provide recommendations on the initiation of CladT in DMT-naïve patients, how to switch from existing DMTs to CladT for patients with continuing MS disease activity, how to manage patients during the first 2 years of treatment and finally, how to manage patients with or without MS disease activity in years 3, 4 and beyond after initiating treatment with CladT. We believe that optimisation of the use of CladT beyond its initial courses of treatment will maximise the benefits of this treatment, especially early in the course of MS when suppression of focal inflammation in the CNS is a clinical priority to limit MS disease progression.

A series of skulls (n = 27) of the American mink (Neogale vison) from the south-east of Belarus (Gomel region, floodplain of the Sozh River) was studied. The animals were caught by different hunters in 2000–2004. The sex of individuals was not determined. When examining the skull, only the most pronounced morpho-anatomical changes that can be diagnosed confidently as deviations from the norm were taken into account. In all cases, lamellar deposition of calcium salts in the area of tentorium cerebelli osseum inside the cranial vault was detected. The growing plate length reached half of the arch height in some individuals. These traits (considerable area of bone plates; presence of a sharp spine growing in different plains) allow suggesting that the analysed growths are of pathological origin. This pathology can considerably affect the viability and physiological status of individuals as it disrupts the functioning of the central nervous system. It is difficult to identify the cause of intracranial calcifications due to the possible effect of factors of various nature. Some degree of calcification of the opisthion region of foramen magnum was found. The changes occurred in the foramen shape cannot be considered phenetic variability. In most individuals, the thinning of maxillary bone in the teeth roots area is observed. However, we believe that the identified degree of bone tissue thinning is not critical and therefore does not affect the life expectancy of individuals. Two adult individuals have swelling of the maxillary bone. In one case, an extensive bone tissue excavation was identified on the left lower jaw, which led to the loss of the canine tooth. The analysed pathomorphological change is not of traumatic nature because in case of post-traumatic osteomyelitis sequesters (separating fragments) are formed. It is necessary to further analyse the American mink skulls available at scientific collections of Belarus and to identify the degree of calcium salt deposits and their impact on the foramen magnum phenotypes. We consider it necessary to create an annotated catalogue of pathologies and anomalies of the skull of the American mink in the south-east of Belarus and adjacent territories of Ukraine, since the morphological method is essential in the diagnosis of bone tissue diseases.

The studies were carried out in 2021 near the village of Yushevichi, Nesvizh Raion, Minsk Oblast (Belarus). The content of pellets of three bird species were analysed: Buteo buteo, Buteo lagopus, and Corvus corax. In total, 129 intact and about 30 destructed pellets were processed. Skeletal elements of five small mammal species belonging to five genera of two orders (Rodentia and Eulipotyphla) were found, including remains of nine speckled ground squirrels. The remains of seven of the nine ground squirrel individuals found in the pellets were found in raven pellets, however, the authors believe that this fact does not yet prove a greater influence of the raven on the local ground squirrel population. The pellets analysis and observations of feeding behaviour of the three bird species prove that the speckled ground squirrel is constantly included in the diet of both diurnal birds of prey (genus Buteo) and of atypical predators with a mixed nutrition (raven). Finding of intact skulls of Spermophilus suslicus in pellets of the mentioned bird species is unlikely, which is determined by its considerable size. This circumstance does not allow obtaining most of the craniometric characters, but does not prevent the detection of pathomorphological changes. To compare the craniological characters, we used the skulls of dead ground squirrels (n = 5) found in the field near the village of Yushevichi. These individuals had visible injuries (lacerated wounds, etc.) presumably left both by predators and fights between ground squirrels. The most striking pathomorphological changes were revealed: osteoporosis and osteolysis of dental alveoli of the upper and lower jaws and initial osteomyelitis of the cranial vault (in the parietal and frontal bones). We believe that the speckled ground squirrel’s conservation status should be raised to at least Category II (according to the system of categories adopted in Belarus) for the following reasons: over the past six years, out of 12 known colonies, only four colonies have survived, two of which are practically unviable; stable for 10 years reduction in the number; and range fragmentation (single localities). According to the IUCN classification, it corresponds to category CR (critically endangered).

Abstract Cladribine tablets (CladT) is a highly active oral disease-modifying therapy (DMT) for the management of relapsing multiple sclerosis (RMS). CladT acts as an immune reconstitution therapy, in that two short courses of treatment 1 year apart have been shown to suppress disease activity for a prolonged period in most patients, without need for continued DMT. Each course of CladT induces a profound reduction in B lymphocytes that recovers over months, and serious lymphopenia (Grade 3–4) is uncommon. Smaller reductions in levels of T lymphocytes occur slightly later: on average, these remain within the normal range and repopulate progressively. A larger effect occurs on CD8 vs. CD4 cells. Reactivation of latent or opportunistic infections (e.g. varicella zoster, tuberculosis) is mostly associated with very low lymphocyte counts ( 800/mm3 (if necessary) are important for avoiding infections and higher-grade lymphopenia. There was no demonstrable or apparent effect of CladT on the efficacy of vaccinations, including against Covid-19. Adverse events consistent with drug-induced liver injury (DILI) represent a rare but potentially serious complication of CladT therapy in spontaneous adverse event reporting; patients should be screened for liver dysfunction before starting treatment. Ongoing hepatic monitoring is not required, but CladT must be withdrawn if signs and symptoms of DILI develop. There was a numerical imbalance for malignancies when comparing cladribine to placebo in the clinical programme, particularly in short-term data, but recent evidence shows that the risk of malignancy with CladT is similar to the background rate in the general population and to that with other DMTs. Overall, CladT is well tolerated with a favorable safety profile appropriate for the management of RMS.

Diabetes mellitus is a widely prevalent chronic disease, and effective treatments for it remain limited. Allicin has anti-diabetic effect, however, the detailed mechanism has not been well investigated. The diabetic rats were treated with allicin for 6 weeks, and then the fecal samples, serum and tissues were collected for measurement of gut microbiota (GM), bile acids (BAs) and other indexes. Allicin decreased the blood glucose levels, serum lipid levels, and alleviated hepatic lipid deposition of the diabetic rats. Simultaneously, allicin changed the composition of GM and increased secondary BAs in serum. Interestingly, allicin significantly increased the glucagon-like peptide-1 (GLP-1) content in colon homogenate, and reduced the protein expression of fibroblast growth factor 15 (FGF15) in ileum. Moreover, allicin increased 7α-hydroxylase 1 (CYP7A1) expression in liver. The study demonstrated that allicin ameliorates metabolisms in the diabetic rats though modulating gut microbiota, bile acids, and inhibiting enterohepatic FGF15-CYP7A1 signaling.

The history of theriological research in the territory of Polissia from the 19th century to the present is considered (authors, works, and contributions to the study of the mammal fauna of the region). A review of the most significant publications on the theriofauna of the Polissia region is presented. The material is considered in chronological order, in four sections: ‘The period before systematic collectings’ (from the 19th century to 1920), ‘The period of field expeditionary research’ (1920–1940), ‘The resumption of theriological research at a new level’ (1945–1970), ‘Period of detailed stationary studies’ (1971–2000), ‘Modern stage of research’ (from 2001 to the present). A list of the most famous researchers of Polissia is given in accordance with the proposed periodization. The authors conclude that the number of studies and publications for the analysed period is connected, first, with state projects for the economic development of this territory (the construction of the Brest–Moscow railway at the end of the 19th century, large-scale land reclamation of Polissia throughout almost the entire 20th century). The key role of A. V. Fedyushin and I. N. Serzhanin for the development of theriological research is noted. The role of nature reserves created in the Chernobyl territory in the study of the mammal fauna of this region is discussed. The complete list of Polissia mammals including 80 species is given. It is concluded that the Polissia theriofauna has not been fully studied (insectivores, bats, and rodents). The theriological studies in the regions of Polissia were carried out unevenly: from single visits and local expeditions to stationary and long-term monitoring studies. The insufficient level of theriological monitoring and, as a result, the lack of proper analysis of changes in mammal assemblages are indicated. The existing scientific collections, where specimens of mammals from Polissia are stored, are not catalogued into a single database and are difficult to study. In Belarus, theriologists are divided and do not have a common platform for the exchange of information and experience. The positive experience of Ukrainian colleagues in the creation and maintenance of the long-term activity of the Theriological School is presented.

SPX receptors regulate plant phosphate response via PHR transcription factors. Here, based on crystal structure analysis of rice PHR2 complexes, the authors propose that SPX2 regulates PHR2 by preventing DNA binding and oligomerisation of the PHR2 CC domain.

Genska terapija postaja čedalje bolj zanimiva tudi v onkologiji. Med aplikacijami je morda najzanimivejša imunostimulacija. Pripravimo lahko plazmidno DNA, ki nosi zapis za različne imunostimulatorne molekule, ki jih vnesemo v celice tumorjev ali normalnih tkiv. Ta tkiva postanejo proizvajalci teh molekul, ki lahko delujejo lokalno ali pa se izločajo tudi sistemsko v krvni obtok. Ker plazmidna DNA ne prehaja celične membrane, so potrebni dostavni sistemi, virusni ali nevirusni. V naših študijah uporabljamo predvsem nevirusni dostavni sistem – elektroporacijo. Interlevkin 12 (IL-12) je eden od zanimivih citokinov, za katerega je znano protitumorsko delovanje s spodbujanjem imunskega odziva in antiangiogenim delovanjem. Namen projekta SmartGene.si je bil pripraviti plazmid z zapisom za interlevkin 12 (plazmid phIL12) in pripraviti vse potrebno za njegovo klinično testiranje za zdravljenje kožnih tumorjev. V konzorciju smo združili moči s partnerji z akademskega in industrijskega področja. Treba je bilo pripraviti plazmid za uporabo v humani onkologiji po zahtevah Evropske agencije za zdravila (EMA). Za prijavo klinične študije na Javno agencijo za zdravila in medicinske pripomočke (JAZMP) smo morali izvesti tudi vse neklinične raziskave o varnosti in učinkovitosti zdravila. Nato je bilo treba razviti postopek priprave zdravila, zagotoviti primerne prostore za pripravo in izvedbo postopka priprave zdravila. V treh letih smo dosegli vse te zastavljene cilje in dobili dovoljenje za izvajanje klinične študije na kožnih tumorjih, ki ga je izdala JAZMP na osnovi pozitivnega mnenja Komisije Republike Slovenije za medicinsko etiko. Zdaj poteka klinična študija faze I preizkušanja plazmida phIL12 na kožnih tumorjih glave in vratu z namenom preveriti varnost in sprejemljivost genskega elektroprenosa plazmida v tumorje. Cilj študije je prav tako določiti primeren odmerek zdravila, ki bi ga v nadaljnji klinični študiji uporabili kot adjuvantno zdravljenje k ablativnim terapijam, kot sta radioterapija ali elektrokemoterapija.

The article discusses the species and taxonomic composition of the long-eared owl (Asio otus) preys based on the analysis of pellets (n = 209) collected in the winter-spring period in 2016 in the Malarytsky district (Lozitsa village) and the Brest region district center. The distance between Malaryta town and Lozitsa village is about 10 km. Parts of the skull of 512 small mammals (2.45 individuals per pellet) and one bird were found. Feeding on birds for the long-eared owl is episodic. Representatives of 2 orders, 10 genera and 12 species of small mammals (5 species of shrews and 7 rodents) became preys of the owl. The proportion of rodents is 98.24 % of all preys. The absolute dominant among prey species is Microtus arvalis (85.16 % of all victims), which is consistent with numerous work carried out in other regions. Significant portions are of Apodemus agrarius (4.10 %), Muscardinus avellanarius (2.54 %), Sylvaemus tauricus (1.76 %), and Alexandromys oeconomus (1.56 %). The list of preys is presented by meadow-field, synanthropic and different species actively moving from adjacent forests in the Malaryta river floodplain and canal systems (Sylvaemus tauricus, Sorex araneus, S. minutus, Neomys fodiens). The occurence of two shrew species Crocidura leucodon and C. suaveolens in the city of Malaryta has been proved, which corresponds to similar information for the city of Brest. This suggests that C. suaveolens inhabits the entire territory of the Belarusian Polesie at present. The occurence of the non-abundant species Sicista betulina in vicinities of the town of Malaryta was confirmed. The results obtained confirm the significant trophic effect of the long-eared owl on the local population of the hazel dormouse and also indicate the relatively high abundance of this rodent in the study area. Seven species were identified in pellets of the long-eared owl living near the village of Lozitsa, and 12 species of small mammals were identified in the town of Malaryta. The diversity of the landscape of the town of Malaryta determines the large number of prey species.

(1) Background: antimicrobial resistance is becoming a dramatic problem for public health, and the design of new antimicrobial agents is an active research area. (2) Methods: based on our previous work, we designed an improved version of the crabrolin peptide and characterized its functional and structural properties with a wide range of techniques. (3) Results: the newly designed peptide, crabrolin21, is much more active than the previous ones and shows specific selectivity towards bacterial cells. (4) Conclusions: crabrolin21 shows interesting properties and deserves further studies.

The article analyses the new record of Neomys anomalus in the lakes Dolzhin (geographic coordinates of the place of capture 55°06'33,8"N, 28°36'03.1"E) and Vechelye (55°07'55.3"N, 28°36'38.6"E and 55°07'55.4"N, 28°36'37.2"E) of Ushachsky district, Vitebsk region, Belarus. The material was collected in July 2019. Captured individuals (n = 3) differed by individual external characteristics (a grey-white spot around the eye but not behind it; non-contrasting transition of colouration between the back and belly) from individuals captured in 2018 (n = 4) on Lake Borkovshchina and its ducts. The revealed morphological differences between individuals trapped in different years confirm the known data on phenetic variability of N. anomalus. The body weight (7.14–8.03 g) and the main parameters (for example, the ratio of tail length to body length was 0.65–0.68) did not differ significantly. Also individuals of N. anomalus did not differ significantly by craniometrical characters (height of coronoid process was 4.04–4.17 mm). In 2018–2019, individuals of the Mediterranean water shrew were trapped in three interconnected lakes, the total length of which with the channels is about 8 km. The shallow and densely overgrown with trees and shrubs channels between the lakes contribute to the dispersal of individuals. According to the results of the 2018 survey, the relative abundance of N. anomalus on Lake Borkovshchina and its channels was 4 individuals / 100 trap-days, and according to 2019 data on Lake Dolzhina and Lake Vechelye — 5.0 and 4.4, respectively. The findings give a reason to suggest the stability of the local population. One of the factors contributing to this phenomenon is the reduction in flood water. To maintain the abundance of the species, it is necessary, first of all, to preserve the shoreline, riparian and aquatic vegetation in lakes. It is advisable to include lakes into the system of protected areas with the status of reserves.

Abstract Background Treatment options for recurrent head and neck tumours in the previously irradiated area are limited, including re-irradiation due to radioresistance of the recurrent tumour and previous dose received by surrounding normal tissues. As an in vitro model to study radioresistance mechanisms, isogenic cells with different radiosensitivity can be used. However, they are not readily available. Therefore, our objective was to establish and characterize radioresistant isogenic human pharyngeal squamous carcinoma cells and to evaluate early radiation response in isogenic parental, radioresistant and radiosensitive cells. Methods Radioresistant cells were derived from parental FaDu cells by repeated exposure to ionizing radiation. Radiosensitivity of the established isogenic radioresistant FaDu-RR cells was evaluated by clonogenic assay and compared to isogenic parental FaDu and radiosensitive 2A3 cells. Additional phenotypic characterization of these isogenic cells with different radiosensitivity included evaluation of chemosensitivity, cell proliferation, cell cycle, radiation-induced apoptosis, resolution of DNA double-strand breaks, and DNA damage and repair signalling gene expression before and after irradiation. Results In the newly established radioresistant cells in response to 5 Gy irradiation, we observed no alteration in cell cycle regulation, but delayed induction and enhanced resolution of DNA double-strand breaks, lower induction of apoptosis, and pronounced over-expression of DNA damage signalling genes in comparison to parental cells. On the other hand, radiosensitive 2A3 cells were arrested in G2/M-phase in response to 5 Gy irradiation, had a prominent accumulation of and slower resolution of DNA double-strand breaks, and no change in DNA damage signalling genes expression. Conclusions We concluded that the emergence of the radioresistance in the established radioresistant isogenic cells can be at least partially attributed to the enhanced DNA double-strand break repair, altered expression of DNA damage signalling and repair genes. On the other hand, in radiosensitive isogenic cells the reduced ability to repair a high number of induced DNA double-strand breaks and no transcriptional response in DNA damage signalling genes indicate on a lack of adaptive response to irradiation. Altogether, our results confirmed that these isogenic cells with different radiosensitivity are an appropriate model to study the mechanisms of radioresistance.

Abstract Background Septic shock is the most severe phase of sepsis and is associated with high rates of mortality. However, early stage prediction of septic shock outcomes remains difficult. Metabolomic techniques have emerged as a promising tool for improving prognosis. Methods Orthogonal projections to latent structures-discriminant analysis (OPLS-DA) models separating the serum metabolomes of survivors from those of non-survivors were established with samples obtained at the intensive care unit (ICU) admission (H0) and 24 h later (H24). For 51 patients with available H0 and H24 samples, multi-level modeling was performed to provide insight into different metabolic evolutions that occurred between H0 and H24 in the surviving and non-surviving patients. Relative quantification and receiver operational characteristic curves (ROC) were applied to estimate the predictability of key discriminatory metabolites for septic shock mortality. Results Metabolites that were involved in energy supply and protein breakdown were primarily responsible for differentiating survivors from non-survivors. This was not only seen in the H0 and H24 discriminatory models, but also in the H0-H24 paired models. Reanalysis of extra H0-H24 paired samples in the established multi-level model demonstrated good performance of the model for the classification of samplings. According to the ROC results, nine discriminatory metabolites defined consistently from the unpaired model and the H0-H24 time-trend change (ΔH24-H0) show good prediction of mortality. These results suggest that NMR-based metabolomic analysis is useful for a better overall assessment of septic shock patients. Conclusions Dysregulation of the metabolites identified by this study is associated with poor outcomes for septic shock. Evaluation of these compounds during the first 24 h after ICU admission in the septic shock patient may be helpful for estimating the severity of cases and for predicting outcomes. Trial registration All human serum samples were collected and stored, provided by the “center of biologic resources for liver disease”, in Jean Verdier Hospital, Bondy, France (BB-0033-00027).

Abstract Background Tumor necrosis factor (TNF) is associated with several neurodegenerative disorders including multiple sclerosis (MS). Although TNF-targeted therapies have been largely unsuccessful in MS, recent preclinical data suggests selective soluble TNF inhibition can promote remyelination. This has renewed interest in regulation of TNF signaling in demyelinating disease, especially given the limited treatment options for progressive MS. Using a mouse model of progressive MS, this study evaluates the effects of sustained TNF on oligodendrocyte (OLG) apoptosis and OLG precursor cell (OPC) differentiation. Methods Induction of experimental autoimmune encephalomyelitis (EAE) in transgenic mice expressing a dominant-negative interferon-γ receptor under the human glial fibrillary acidic protein promoter (GFAPγR1Δ) causes severe non-remitting disease associated with sustained TNF. Therapeutic effects in GFAPγR1Δ mice treated with anti-TNF compared to control antibody during acute EAE were evaluated by assessing demyelinating lesion size, remyelination, OLG apoptosis, and OPC differentiation. Results More severe and enlarged demyelinating lesions in GFAPγR1Δ compared to wild-type (WT) mice were associated with increased OLG apoptosis and reduced differentiated CC1+Olig2+ OLG within lesions, as well as impaired upregulation of TNF receptor-2, suggesting impaired OPC differentiation. TNF blockade during acute EAE in GFAPγR1Δ both limited OLG apoptosis and enhanced OPC differentiation consistent with reduced lesion size and clinical recovery. TNF neutralization further limited increasing endothelin-1 (ET-1) expression in astrocytes and myeloid cells noted in lesions during disease progression in GFAPγR1Δ mice, supporting inhibitory effects of ET-1 on OPC maturation. Conclusion Our data implicate that IFNγ signaling to astrocytes is essential to limit a detrimental positive feedback loop of TNF and ET-1 production, which increases OLG apoptosis and impairs OPC differentiation. Interference of this cycle by TNF blockade promotes repair independent of TNFR2 and supports selective TNF targeting to mitigate progressive forms of MS.

Translationally Controlled Tumor Protein (TCTP) controls growth by regulating the G1/S transition during cell cycle progression. Our genetic interaction studies show that TCTP fulfills this role by interacting with CSN4, a subunit of the COP9 Signalosome complex, known to influence CULLIN-RING ubiquitin ligases activity by controlling CULLIN (CUL) neddylation status. In agreement with these data, downregulation of CSN4 in Arabidopsis and in tobacco cells leads to delayed G1/S transition comparable to that observed when TCTP is downregulated. Loss-of-function of AtTCTP leads to increased fraction of deneddylated CUL1, suggesting that AtTCTP interferes negatively with COP9 function. Similar defects in cell proliferation and CUL1 neddylation status were observed in Drosophila knockdown for dCSN4 or dTCTP, respectively, demonstrating a conserved mechanism between plants and animals. Together, our data show that CSN4 is the missing factor linking TCTP to the control of cell cycle progression and cell proliferation during organ development and open perspectives towards understanding TCTP's role in organ development and disorders associated with TCTP miss-expression.

In this study, radiotherapy was combined with the gene electrotransfer (GET) of plasmid encoding shRNA against melanoma cell adhesion molecule (pMCAM) with dual action, which was a vascular-targeted effect mediated by the silencing of MCAM and an immunological effect mediated by the presence of plasmid DNA in the cytosol-activating DNA sensors. The effects and underlying mechanisms of therapy were evaluated in more immunogenic B16F10 melanoma and less immunogenic TS/A carcinoma. The silencing of MCAM potentiated the effect of irradiation (IR) in both tumor models. Combined therapy resulted in 81% complete responses (CR) in melanoma and 27% CR in carcinoma. Moreover, after the secondary challenge of cured mice, 59% of mice were resistant to challenge with melanoma cells, and none were resistant to carcinoma. Combined therapy reduced the number of blood vessels; induced hypoxia, apoptosis, and necrosis; and reduced cell proliferation in both tumor models. In addition, the significant increase of infiltrating immune cells was observed in both tumor models but more so in melanoma, where the expression of IL-12 and TNF-α was determined as well. Our results indicate that the combined therapy exerts both antiangiogenic and immune responses that contribute to the antitumor effect. However, tumor immunological status is crucial for a sufficient immune system contribution to the overall antitumor effect.

The central nervous system (CNS) is vulnerable to several viral infections including herpes viruses, arboviruses and HIV to name a few. While a rapid and effective immune response is essential to limit viral spread and mortality, this anti-viral response needs to be tightly regulated in order to limit immune mediated tissue damage. This balance between effective virus control with limited pathology is especially important due to the highly specialized functions and limited regenerative capacity of neurons, which can be targets of direct virus cytolysis or bystander damage. CNS infection with the neurotropic strain of mouse hepatitis virus (MHV) induces an acute encephalomyelitis associated with focal areas of demyelination, which is sustained during viral persistence. Both innate and adaptive immune cells work in coordination to control virus replication. While type I interferons are essential to limit virus spread associated with early mortality, perforin, and interferon-γ promote further virus clearance in astrocytes/microglia and oligodendrocytes, respectively. Effective control of virus replication is nonetheless associated with tissue damage, characterized by demyelinating lesions. Interestingly, the anti-inflammatory cytokine IL-10 limits expansion of tissue lesions during chronic infection without affecting viral persistence. Thus, effective coordination of pro- and anti-inflammatory cytokines is essential during MHV induced encephalomyelitis in order to protect the host against viral infection at a limited cost.

Multiple Sclerosis (MS) is a chronic inflammatory disease of the central nervous system (CNS) characterized by demyelination and axonal loss. Demyelinating lesions are associated with infiltrating T lymphocytes, bone marrow-derived macrophages (BMDM), and activated resident microglia. Tissue damage is thought to be mediated by T cell produced cytokines and chemokines, which activate microglia and/or BMDM to both strip myelin and produce toxic factors, ultimately damaging axons and promoting disability. However, the relative contributions of BMDM and microglia to demyelinating pathology are unclear, as their identification in MS tissue is difficult due to similar morphology and indistinguishable surface markers when activated. The CD4 T cell-induced autoimmune murine model of MS, experimental autoimmune encephalitis (EAE), in which BMDM are essential for demyelination, has revealed pathogenic and repair-promoting phenotypes associated with BMDM and microglia, respectively. Using a murine model of demyelination induced by a gliatropic coronavirus, in which BMDM are redundant for demyelination, we herein characterize gene expression profiles of BMDM versus microglia associated with demyelination. While gene expression in CNS infiltrating BMDM was upregulated early following infection and subsequently sustained, microglia expressed a more dynamic gene profile with extensive mRNA upregulation coinciding with peak demyelination after viral control. This delayed microglia response comprised a highly pro-inflammatory and phagocytic profile. Furthermore, while BMDM exhibited a mixed phenotype of M1 and M2 markers, microglia repressed the vast majority of M2-markers. Overall, these data support a pro-inflammatory and pathogenic role of microglia temporally remote from viral control, whereas BMDM retained their gene expression profile independent of the changing environment. As demyelination is caused by multifactorial insults, our results highlight the plasticity of microglia in responding to distinct inflammatory settings, which may be relevant for MS pathogenesis.

Periodontitis is characterized by the loss of the supporting tissues of the teeth in an inflammatory-infectious context. The diagnosis relies on clinical and X-ray examination. Unfortunately, clinical signs of tissue destruction occur late in the disease progression. Therefore, it is mandatory to identify reliable biomarkers to facilitate a better and earlier management of this disease. To this end, saliva represents a promising fluid for identification of biomarkers as metabolomic fingerprints. The present study used high-resolution 1H-nuclear magnetic resonance (NMR) spectroscopy coupled with multivariate statistical analysis to identify the metabolic signature of active periodontitis. The metabolome of stimulated saliva of 26 patients with generalized periodontitis (18 chronic and 8 aggressive) was compared to that of 25 healthy controls. Principal Components Analysis (PCA), performed with clinical variables, indicated that the patient population was homogeneous, demonstrating a strong correlation between the clinical and the radiological variables used to assess the loss of periodontal tissues and criteria of active disease. Orthogonal Projection to Latent Structure (OPLS) analysis showed that patients with periodontitis can be discriminated from controls on the basis of metabolite concentrations in saliva with satisfactory explained variance (R2X = 0.81 and R2Y = 0.61) and predictability (Q2Y = 0.49, CV-AUROC = 0.94). Interestingly, this discrimination was irrespective of the type of generalized periodontitis, i.e. chronic or aggressive. Among the main discriminating metabolites were short chain fatty acids as butyrate, observed in higher concentrations, and lactate, γ-amino-butyrate, methanol, and threonine observed in lower concentrations in periodontitis. The association of lactate, GABA, and butyrate to generate an aggregated variable reached the best positive predictive value for diagnosis of periodontitis. In conclusion, this pilot study showed that 1H-NMR spectroscopy analysis of saliva could differentiate patients with periodontitis from controls. Therefore, this simple, robust, non-invasive method, may offer a significant help for early diagnosis and follow-up of periodontitis.

Viral infections have long been implicated as triggers of autoimmune diseases, including Multiple Sclerosis (MS), a central nervous system (CNS) inflammatory demyelinating disorder. Epitope spreading, molecular mimicry, cryptic antigen and bystander activation have been implicated as mechanisms responsible for activating self-reactive (SR) immune cells, ultimately leading to organ-specific autoimmune disease. Taking advantage of coronavirus JHM strain of mouse hepatitis virus (JHMV) induced demyelination, this study demonstrates that the host also mounts counteractive measures to specifically limit expansion of endogenous SR T cells. In this model, immune mediated demyelination is associated with induction of SR T cells after viral control. However, their decline during persisting infection, despite ongoing demyelination, suggests an active control mechanism.Antigen-specific IL-10 secreting CD4+ T cells (Tr1) and Foxp3+ regulatory T cells (Tregs), both known to control autoimmunity and induced following JHMV infection, were assessed for their relative in vivo suppressive function of SR T cells. Ablation of Foxp3+ Tregs in chronically infected DEREG mice significantly increased SR CD4+ T cells within cervical lymph nodes (CLN), albeit without affecting their numbers or activation within the CNS compared to controls. In contrast, infected IL-27 receptor deficient (IL-27R-/-) mice, characterized by a drastic reduction of Tr1 cells, revealed that SR CD4+ T cells in CLN remained unchanged, but were specifically increased within the CNS. These results suggest that distinct regulatory T cell subsets limit SR T cells in the draining lymph nodes and CNS to maximize suppression of SR T cell mediated autoimmune pathology. The JHMV model is thus valuable to decipher tissue specific mechanisms preventing autoimmunity.

The alkylpyridinium polymer APS8, a potent antagonist of α7 nicotinic acetylcholine receptors (nAChRs), selectively induces apoptosis in non-small cell lung cancer cells but not in normal lung fibroblasts. To explore the potential therapeutic value of APS8 for at least certain types of lung cancer, we determined its systemic and organ-specific toxicity in mice, evaluated its antitumor activity against adenocarcinoma xenograft models, and examined the in-vitro mechanisms of APS8 in terms of apoptosis, cytotoxicity, and viability. We also measured Ca2+ influx into cells, and evaluated the effects of APS8 on Ca2+ uptake while siRNA silencing of the gene for α7 nAChRs, CHRNA7. APS8 was not toxic to mice up to 5 mg/kg i.v., and no significant histological changes were observed in mice that survived APS8 treatment. Repetitive intratumoral injections of APS8 (4 mg/kg) significantly delayed growth of A549 cell tumors, and generally prevented regrowth of tumors, but were less effective in reducing growth of HT29 cell tumors. APS8 impaired the viability of A549 cells in a dose-dependent manner and induced apoptosis at micro molar concentrations. Nano molar APS8 caused minor cytotoxic effects, while cell lysis occurred at APS8 >3 µM. Furthermore, Ca2+ uptake was significantly reduced in APS8-treated A549 cells. Observed differences in response to APS8 can be attributed to the number of α7 nAChRs expressed in these cells, with those with more AChRs (i.e., A549 cells) being more sensitive to nAChR antagonists like APS8. We conclude that α7 nAChR antagonists like APS8 have potential to be used as therapeutics for tumors expressing large numbers of α7 nAChRs.

A variety of thermodynamic models have been developed to predict inorganic gas-aerosol equilibrium. To achieve computational efficiency a number of the models rely on a priori specification of the phases present in certain relative humidity regimes. Presented here is a new computational model, named UHAERO, that is both efficient and rigorously computes phase behavior without any a priori specification. The computational implementation is based on minimization of the Gibbs free energy using a primal-dual method, coupled to a Newton iteration. The mathematical details of the solution are given elsewhere. The model computes deliquescence behavior without any a priori specification of the relative humidities of deliquescence. Also included in the model is a formulation based on classical theory of nucleation kinetics that predicts crystallization behavior. Detailed phase diagrams of the sulfate/nitrate/ammonium/water system are presented as a function of relative humidity at 298.15 K over the complete space of composition.

INTRODUCTION: Acute-on-chronic liver failure is characterized by acute deterioration of liver function in patients with compensated or decompensated, but stable, cirrhosis. However, there is no accurate definition of acute-on-chronic liver failure and physicians often use this term to describe different clinical entities. Metabolomics investigates metabolic changes in biological systems and identifies the biomarkers or metabolic profiles. Our study assessed the metabolomic profile of serum using proton nuclear magnetic resonance ((1)H-NMR) spectroscopy to identify metabolic changes related to acute-on-chronic liver failure. PATIENTS: Ninety-three patients with compensated or decompensated cirrhosis (CLF group) but stable liver function and 30 patients with cirrhosis and hospitalized for the management of an acute event who may be responsible of acute-on-chronic liver failure (ACLF group), were fully analyzed. Blood samples were drawn at admission, and sera were separated and stored at -80°C until (1)H-NMR spectral analysis. Using orthogonal projection to latent-structure discriminant analyses, various metabolites contribute to the complete separation between these both groups. RESULTS: The predictability of the model was 0.73 (Q(2) Y) and the explained variance was 0.63 (R(2) Y). The main metabolites that had increased signals related to acute-on-chronic liver failure were lactate, pyruvate, ketone bodies, glutamine, phenylalanine, tyrosine, and creatinine. High-density lipids were lower in the ALCF group than in CLF group. CONCLUSION: A serum metabolite fingerprint for acute-on-chronic liver failure, obtained with (1)H-NMR, was identified. Metabolomic profiling may aid clinical evaluation of patients with cirrhosis admitted into intensive care units with acute-on-chronic liver failure, and provide new insights into the metabolic processes involved in acute impairment of hepatic function.

BACKGROUND: Glioma cells not only secrete high levels of vascular endothelial growth factor (VEGF) but also express VEGF receptors (VEGFR), supporting the existence of an autocrine loop. The direct impact on glioma cells metabolism of drugs targeting the VEGF pathway, such as Bevacizumab (Bev) or VEGFR Tyrosine Kinase Inhibitor (TKI), is poorly known. MATERIAL AND METHODS: U87 cells were treated with Bev or SU1498, a selective VEGFR2 TKI. VEGFR expression was checked with FACS flow cytometry and Quantitative Real-Time PCR. VEGF secretion into the medium was assessed with an ELISA kit. Metabolomic studies on cells were performed using High Resolution Magic Angle Spinning Spectroscopy (HR-MAS). RESULTS: U87 cells secreted VEGF and expressed low level of VEGFR2, but no detectable VEGFR1. Exposure to SU1498, but not Bev, significantly impacted cell proliferation and apoptosis. Metabolomic studies with HR MAS showed that Bev had no significant effect on cell metabolism, while SU1498 induced a marked increase in lipids and a decrease in glycerophosphocholine. Accordingly, accumulation of lipid droplets was seen in the cytoplasm of SU1498-treated U87 cells. CONCLUSION: Although both drugs target the VEGF pathway, only SU1498 showed a clear impact on cell proliferation, cell morphology and metabolism. Bevacizumab is thus less likely to modify glioma cells phenotype due to a direct therapeutic pressure on the VEGF autocrine loop. In patients treated with VEGFR TKI, monitoring lipids with magnetic resonance spectroscopic (MRS) might be a valuable marker to assess drug cytotoxicity.

Infection of the CNS (central nervous system) with a sublethal neurotropic coronavirus (JHMV) induces a vigorous inflammatory response. CD4 + and CD8 + T cells are essential to control infectious virus but at the cost of tissue damage. An enigma in understanding the contribution of T cell subsets in pathogenesis resides in their distinct migration pattern across the BBB (blood brain barrier). CD4 + T cells transiently accumulate within the perivascular space, whereas CD8 + T cells migrate directly into the CNS parenchyma. As MMPs (matrix metalloproteinases) facilitate migration across the glia limitans, specific expression of the TIMP (tissue inhibitor of MMPs)-1 by CD4 + T cells present in the perivascular cuffs suggested that TIMP-1 is responsible for stalling CD4 + T cell migration into the CNS parenchyma. Using TIMP-1 deficient mice, the present data demonstrate an increase rather than a decrease in CD4 + T cell accumulation within the perivascular space during JHMV infection. Whereas virus control was not affected by perivascular retention of CD4 + T cells, disease severity was decreased and associated with reduced IFN γ (interferon γ) production. Moreover, decreased CD4 + T cell recruitment into the CNS parenchyma of TIMP-1 deficient mice was not associated with impaired T cell recruiting chemokines or MMP expression, and no compensation by other TIMP molecules was identified. These data suggest an MMP-independent role of TIMP-1 in regulating CD4 + T cell access into the CNS parenchyma during acute JHMV encephalitis.

Abstract Background The interplay between IFN-γ, IL-17 and neutrophils during CNS inflammatory disease is complex due to cross-regulatory factors affecting both positive and negative feedback loops. These interactions have hindered the ability to distinguish the relative contributions of neutrophils, Th1 and Th17 cell-derived effector molecules from secondary mediators to tissue damage and morbidity. Methods Encephalitis induced by a gliatropic murine coronavirus was used as a model to assess the direct contributions of neutrophils, IFN-γ and IL-17 to virus-induced mortality. CNS inflammatory conditions were selectively manipulated by adoptive transfer of virus-primed wild-type (WT) or IFN-γ deficient (GKO) memory CD4+ T cells into infected SCID mice, coupled with antibody-mediated neutrophil depletion and cytokine blockade. Results Transfer of GKO memory CD4+ T cells into infected SCID mice induced rapid mortality compared to recipients of WT memory CD4+ T cells, despite similar virus control and demyelination. In contrast to recipients of WT CD4+ T cells, extensive neutrophil infiltration and IL-17 expression within the CNS in recipients of GKO CD4+ T cells provided a model to directly assess their contribution(s) to disease. Recipients of WT CD4+ T cells depleted of IFN-γ did not express IL-17 and were spared from mortality despite abundant CNS neutrophil infiltration, indicating that mortality was not mediated by excessive CNS neutrophil accumulation. By contrast, IL-17 depletion rescued recipients of GKO CD4+ T cells from rapid mortality without diminishing neutrophils or reducing GM-CSF, associated with pathogenic Th17 cells in CNS autoimmune models. Furthermore, co-transfer of WT and GKO CD4+ T cells prolonged survival in an IFN-γ dependent manner, although IL-17 transcription was not reduced. Conclusions These data demonstrate that IL-17 mediates detrimental clinical consequences in an IFN-γ-deprived environment, independent of extensive neutrophil accumulation or GM-CSF upregulation. The results also suggest that IFN-γ overrides the detrimental IL-17 effector responses via a mechanism downstream of transcriptional regulation.