18 results on '"Pye, Katherine"'
Search Results
2. Economic Evaluation of Early Interventions for Autistic Children: A Scoping Review
- Author
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Pye, Katherine, Jackson, Hannah, Iacono, Teresa, and Shiell, Alan
- Published
- 2024
- Full Text
- View/download PDF
3. Clinician Proposed Predictors of Spoken Language Outcomes for Minimally Verbal Children with Autism Spectrum Disorder
- Author
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Trembath, David, Sutherland, Rebecca, Caithness, Teena, Dissanayake, Cheryl, Eapen, Valsamma, Fordyce, Kathryn, Frost, Grace, Iacono, Teresa, Mahler, Nicole, Masi, Anne, Paynter, Jessica, Pye, Katherine, Reilly, Sheena, Rose, Veronica, Sievers, Stephanie, Thirumanickam, Abirami, Westerveld, Marleen, and Tucker, Madonna
- Abstract
Our aim was to explore insights from clinical practice that may inform efforts to understand and account for factors that predict spoken language outcomes for children with Autism Spectrum Disorder who use minimal verbal language. We used a qualitative design involving three focus groups with 14 speech pathologists to explore their views and experiences. Using the Framework Method of analysis, we identified 9 themes accounting for 183 different participant references to potential factors. Participants highlighted the relevance of clusters of fine-grained social, communication, and learning behaviours, including novel insights into prelinguistic vocal behaviours. The participants suggested the potential value of dynamic assessment in predicting spoken language outcomes. The findings can inform efforts to developing clinically relevant methods for predicting children's communication outcomes.
- Published
- 2021
- Full Text
- View/download PDF
4. Spoken Language Change in Children on the Autism Spectrum Receiving Community-Based Interventions
- Author
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Trembath, David, Stainer, Matt, Caithness, Teena, Dissanayake, Cheryl, Eapen, Valsamma, Fordyce, Kathryn, Frewer, Veronica, Frost, Grace, Hudry, Kristelle, Iacono, Teresa, Mahler, Nicole, Masi, Anne, Paynter, Jessica, Pye, Katherine, Quan, Shannon, Shellshear, Leanne, Sutherland, Rebecca, Sievers, Stephanie, Thirumanickam, Abirami, Westerveld, Marleen F., and Tucker, Madonna
- Published
- 2022
- Full Text
- View/download PDF
5. From the "laboratory" to the "arena": the EU's quest for maturity and the instrumentalisation of conflict in Africa.
- Author
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Pye, Katherine
- Subjects
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NEOCOLONIALISM , *MYOPIA , *TWO thousands (Decade) , *POPULARITY , *GEOPOLITICS - Abstract
Since the 2000s the EU has used African conflicts as "laboratories" to develop its Common Security and Defence Policy (CSDP) and to mature its profile as a security actor; half of all CSDP missions have been deployed on the continent. However, the ineffectiveness of these missions, accusations of neocolonialism and the increasing appeal of Russian security assistance have raised fundamental questions about the legitimacy and efficacy of the CSDP model. Using a postcolonial decentring framework, which facilitates a clearer focus on African agency, I analyse why the EU has been unable to make sense of Russia's increasingly prominent role in African security. Through interviews with EU staff, document analysis and fieldwork in Mali, this paper explores how the EU's instrumentalisation of Africa as a "laboratory" – which positioned the continent as a depoliticised testing ground, with limited regard for the effectiveness of these tests – has had counterproductive effects on its long-term influence. It has left the EU unable to fathom why its geopolitical rivals enjoy popularity in Africa or to respond appropriately. In its preoccupation with its own maturation process, the EU has disregarded the agency of Africans and this myopia has been deliberately exploited by Russia. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
6. Regulation of astrocyte metabolism by mitochondrial translocator protein 18 kDa.
- Author
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Firth, Wyn, Robb, Josephine L., Stewart, Daisy, Pye, Katherine R., Bamford, Rosemary, Oguro‐Ando, Asami, Beall, Craig, and Ellacott, Kate L. J.
- Subjects
MITOCHONDRIAL proteins ,METABOLIC regulation ,TRANSLOCATOR proteins ,METABOLIC flux analysis ,CELL respiration ,FATTY acid oxidation - Abstract
The mitochondrial translocator protein 18 kDa (TSPO) has been linked to functions from steroidogenesis to regulation of cellular metabolism and is an attractive therapeutic target for chronic CNS inflammation. Studies in Leydig cells and microglia indicate that TSPO function may vary between cells depending on their specialized roles. Astrocytes are critical for providing trophic and metabolic support in the brain. Recent work has highlighted that TSPO expression increases in astrocytes under inflamed conditions and may drive astrocyte reactivity. Relatively little is known about the role TSPO plays in regulating astrocyte metabolism and whether this protein is involved in immunometabolic processes in these cells. Using TSPO‐deficient (TSPO−/−) mouse primary astrocytes in vitro (MPAs) and a human astrocytoma cell line (U373 cells), we performed extracellular metabolic flux analyses. We found that TSPO deficiency reduced basal cellular respiration and attenuated the bioenergetic response to glucopenia. Fatty acid oxidation was increased, and lactate production was reduced in TSPO−/− MPAs and U373 cells. Co‐immunoprecipitation studies revealed that TSPO forms a complex with carnitine palmitoyltransferase 1a in U373 and MPAs, presenting a mechanism wherein TSPO may regulate FAO in these cells. Compared to TSPO+/+ cells, in TSPO−/− MPAs we observed attenuated tumor necrosis factor release following 3 h lipopolysaccharide (LPS) stimulation, which was enhanced at 24 h post‐LPS stimulation. Together these data suggest that while TSPO acts as a regulator of metabolic flexibility, TSPO deficiency does not appear to modulate the metabolic response of MPAs to inflammation, at least in response to the model used in this study. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
7. TMEM203 is a binding partner and regulator of STING-mediated inflammatory signaling in macrophages
- Author
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Li, Yang, James, Sharmy J., Wyllie, David H., Wynne, Claire, Czibula, Agnes, Bukhari, Ahmed, Pye, Katherine, Mustafah, Seri Musfirah Bte, Fajka-Boja, Roberta, Szabo, Eniko, Angyal, Adrienn, Hegedus, Zoltan, Kovacs, Laszlo, Hill, Adrian V. S., Jefferies, Caroline A., Wilson, Heather L., Yongliang, Zhang, and Kiss-Toth, Endre
- Published
- 2019
8. Early intervention for young children with autism spectrum disorder: protocol for a scoping review of economic evaluations
- Author
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Pye, Katherine, Jackson, Hannah, Iacono, Teresa, and Shiell, Alan
- Published
- 2021
- Full Text
- View/download PDF
9. Correction to: Spoken Language Change in Children on the Autism Spectrum Receiving Community-Based Interventions
- Author
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Trembath, David, Stainer, Matt, Caithness, Teena, Dissanayake, Cheryl, Eapen, Valsamma, Fordyce, Kathryn, Frewer, Veronica, Frost, Grace, Hudry, Kristelle, Iacono, Teresa, Mahler, Nicole, Masi, Anne, Paynter, Jessica, Pye, Katherine, Quan, Shannon, Shellshear, Leanne, Sutherland, Rebecca, Sievers, Stephanie, Thirumanickam, Abirami, Westerveld, Marleen F., and Tucker, Madonna
- Published
- 2022
- Full Text
- View/download PDF
10. Astrocytes at the intersection of ageing, obesity, and neurodegeneration.
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Firth, Wyn, Pye, Katherine R., and Potter, Paul G. Weightman
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ASTROCYTES , *NEURODEGENERATION , *OBESITY , *CENTRAL nervous system , *NEUROGLIA - Abstract
Once considered passive cells of the central nervous system (CNS), glia are now known to actively maintain the CNS parenchyma; in recent years, the evidence for glial functions in CNS physiology and pathophysiology has only grown. Astrocytes, a heterogeneous group of glial cells, play key roles in regulating the metabolic and inflammatory landscape of the CNS and have emerged as potential therapeutic targets for a variety of disorders. This review will outline astrocyte functions in the CNS in healthy ageing, obesity, and neurodegeneration, with a focus on the inflammatory responses and mitochondrial function, and will address therapeutic outlooks. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
11. Impact of chemogenetic activation of dorsal vagal complex astrocytes in mice on adaptive glucoregulatory responses.
- Author
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MacDonald, Alastair J., Pye, Katherine R., Beall, Craig, and Ellacott, Kate L. J.
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VAGAL tone , *SOLITARY nucleus , *GLIAL fibrillary acidic protein , *ASTROCYTES , *BLOOD sugar , *GLUCOSE tolerance tests - Abstract
The dorsal vagal complex (DVC) regulates diverse aspects of physiology including food intake and blood glucose homeostasis. Astrocytes play an active role in regulating DVC function and, by extension, physiological parameters. DVC astrocytes in ex vivo slices respond to low tissue glucose. The response of neurons to low glucose is conditional on intact astrocyte signalling in slice preparations, suggesting astrocytes are primary sensors of glucose deprivation (glucoprivation). Based on these published findings we hypothesised that in vivo DVC astrocyte manipulation with chemogenetics would be sufficient to alter physiological responses that control blood glucose. We found that 2‐h after systemic 2‐DG‐induced glucoprivation there were no observable changes in morphology of glial fibrillary acidic protein (GFAP)‐immunoreactive DVC cells, specifically those in the nucleus of the solitary tract (NTS). Chemogenetic activation of DVC astrocytes was sufficient to suppress nocturnal food intake by reducing both meal size and meal number and this manipulation also suppressed 2‐DG‐induced glucoprivic food intake. Chemogenetic activation of DVC astrocytes did not increase basal blood glucose nor protect against insulin‐induced hypoglycaemia. In male mice, chemogenetic DVC astrocyte activation did not alter glucose tolerance. In female mice, the initial glucose excursion was reduced in a glucose tolerance test, suggesting enhanced glucose absorption. Based on our data and published work, we propose that DVC astrocytes may play an indispensable homeostatic role, that is, are necessary to maintain the function of glucoregulatory neuronal circuitry, but alone their bulk activation is not sufficient to result in adaptive glucoregulatory responses. It is possible that there are state‐dependent effects and/or DVC astrocyte subsets that have this specialised role, but this was unresolvable using the experimental approaches employed here. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
12. Spoken Language Change in Children on the Autism Spectrum Receiving Community-Based Interventions.
- Author
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Trembath, David, Stainer, Matt, Caithness, Teena, Dissanayake, Cheryl, Eapen, Valsamma, Fordyce, Kathryn, Frewer, Veronica, Frost, Grace, Hudry, Kristelle, Iacono, Teresa, Mahler, Nicole, Masi, Anne, Paynter, Jessica, Pye, Katherine, Quan, Shannon, Shellshear, Leanne, Sutherland, Rebecca, Sievers, Stephanie, Thirumanickam, Abirami, and Westerveld, Marleen F.
- Subjects
PHONOLOGICAL awareness ,COMMUNITY health services ,REGRESSION analysis ,AUTISM ,RESEARCH funding ,COMMUNICATION ,EARLY intervention (Education) ,ODDS ratio ,CHILDREN - Abstract
We assessed the spoken language of 73 preschool aged children on the autism spectrum receiving community-based early intervention at two time points, approximately 7 months apart. Using the Spoken Language Benchmarks, there was a small non-significant change in the proportion of children transitioning from below, to at or above, Phase 3 (word combinations). Using binomial regression, a model comprising seven of nine clinician-proposed child-related predictors explained 64% of the variance. None of the predictors were individually significant, although a large effect size (OR = 16.71) was observed for children's baseline rate of communicative acts. The findings point to substantial unmet clinical need in children with minimal verbal language, but also the relevance of clinician-proposed predictors of their spoken language outcomes. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
13. Brain Permeable AMP-Activated Protein Kinase Activator R481 Raises Glycaemia by Autonomic Nervous System Activation and Amplifies the Counterregulatory Response to Hypoglycaemia in Rats.
- Author
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Cruz, Ana M., Partridge, Katie M., Malekizadeh, Yasaman, Vlachaki Walker, Julia M., Weightman Potter, Paul G., Pye, Katherine R., Shaw, Simon J., Ellacott, Kate L. J., and Beall, Craig
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PROTEIN kinases ,AUTONOMIC nervous system ,HYPOGLYCEMIA ,BLOOD sugar ,GLUCOSE tolerance tests ,INSULIN shock - Abstract
Aim: We evaluated the efficacy of a novel brain permeable "metformin-like" AMP-activated protein kinase activator, R481, in regulating glucose homeostasis. Materials and Methods: We used glucose sensing hypothalamic GT1-7 neuronal cells and pancreatic αTC1.9 α-cells to examine the effect of R481 on AMPK pathway activation and cellular metabolism. Glucose tolerance tests and hyperinsulinemic-euglycemic and hypoglycemic clamps were used in Sprague-Dawley rats to assess insulin sensitivity and hypoglycemia counterregulation, respectively. Results: In vitro , we demonstrate that R481 increased AMPK phosphorylation in GT1-7 and αTC1.9 cells. In Sprague-Dawley rats, R481 increased peak glucose levels during a glucose tolerance test, without altering insulin levels or glucose clearance. The effect of R481 to raise peak glucose levels was attenuated by allosteric brain permeable AMPK inhibitor SBI-0206965. This effect was also completely abolished by blockade of the autonomic nervous system using hexamethonium. During hypoglycemic clamp studies, R481 treated animals had a significantly lower glucose infusion rate compared to vehicle treated controls. Peak plasma glucagon levels were significantly higher in R481 treated rats with no change to plasma adrenaline levels. In vitro , R481 did not alter glucagon release from αTC1.9 cells, but increased glycolysis. Non brain permeable AMPK activator R419 enhanced AMPK activity in vitro in neuronal cells but did not alter glucose excursion in vivo. Conclusions: These data demonstrate that peripheral administration of the brain permeable "metformin-like" AMPK activator R481 increases blood glucose by activation of the autonomic nervous system and amplifies the glucagon response to hypoglycemia in rats. Taken together, our data suggest that R481 amplifies the counterregulatory response to hypoglycemia by a central rather than a direct effect on the pancreatic α-cell. These data provide proof-of-concept that central AMPK could be a target for future drug development for prevention of hypoglycemia in diabetes. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
14. TMEM203 is a binding partner and regulator of STING-mediated inflammatory signaling in macrophages.
- Author
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Yang Li, James, Sharmy J., Wyllie, David H., Wynne, Claire, Czibula, Agnes, Bukhari, Ahmed, Pye, Katherine, Bte Mustafah, Seri Musfirah, Fajka-Boja, Roberta, Szabo, Eniko, Angyal, Adrienn, Hegedus, Zoltan, Kovacs, Laszlo, Hill, Adrian V. S., Jefferies, Caroline A., Wilson, Heather L., Zhang Yongliang, and Kiss-Toth, Endre
- Subjects
TYPE I interferons ,MEMBRANE proteins ,SYSTEMIC lupus erythematosus ,TRANSCRIPTION factors ,T cells - Abstract
Regulation of IFN signaling is critical in host recognition and response to pathogens while its dysregulation underlies the pathogenesis of several chronic diseases. STimulator of IFN Genes (STING) has been identified as a critical mediator of IFN inducing innate immune pathways, but little is known about direct coregulators of this protein. We report here that TMEM203, a conserved putative transmembrane protein, is an intracellular regulator of STING-mediated signaling. We show that TMEM203 interacts, functionally cooperates, and comigrates with STING following cell stimulation, which in turn leads to the activation of the kinase TBK1, and the IRF3 transcription factor. This induces target genes in macrophages, including IFN-β. Using Tmem203 knockout bone marrow-derived macrophages and transient knockdown of TMEM203 in human monocyte-derived macrophages, we show that TMEM203 protein is required for cGAMPinduced STING activation. Unlike STING, TMEM203 mRNA levels are elevated in T cells from patients with systemic lupus erythematosus, a disease characterized by the overexpression of type I interferons. Moreover, TMEM203 mRNA levels are associated with disease activity, as assessed by serum levels of the complement protein C3. Identification of TMEM203 sheds light into the control of STING-mediated innate immune responses, providing a potential novelmechanism for therapeutic interventions in STING-associated inflammatory diseases. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
15. Correction to: Spoken Language Change in Children on the Autism Spectrum Receiving Community-Based Interventions.
- Author
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Trembath, David, Stainer, Matt, Caithness, Teena, Dissanayake, Cheryl, Eapen, Valsamma, Fordyce, Kathryn, Frewer, Veronica, Frost, Grace, Hudry, Kristelle, Iacono, Teresa, Mahler, Nicole, Masi, Anne, Paynter, Jessica, Pye, Katherine, Quan, Shannon, Shellshear, Leanne, Sutherland, Rebecca, Sievers, Stephanie, Thirumanickam, Abirami, and Westerveld, Marleen F.
- Subjects
PHONOLOGICAL awareness ,COMMUNITY health services ,AUTISM ,CHILDREN - Abstract
The article presents the discussion on correction "Spoken Language Change in Children on the Autism Spectrum Receiving Community‑Based Interventions."
- Published
- 2023
- Full Text
- View/download PDF
16. Top ten resources in an intensive, group-based intervention setting for young children with autism spectrum disorder.
- Author
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Pye, Katherine
- Subjects
TREATMENT of autism ,CLINICAL medicine research ,GOAL (Psychology) ,INTERDISCIPLINARY research ,UNIVERSITIES & colleges ,GROUP process ,EARLY intervention (Education) ,TEACHING methods - Abstract
The article presents a list of top resources for group based intervention for children with Autism Spectrum Disorder (ASD) including the Early Start Denver Model (ESDM) manual, data collection and analysis system and a researcher providing timely teaching material based on the requirements.
- Published
- 2014
17. Validation of a refined protocol for mouse oral glucose tolerance testing without gavage.
- Author
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Pye KR, Lantier L, Ayala JE, Beall C, and Ellacott KLJ
- Abstract
A glucose tolerance test (GTT) is routinely used to assess glucose homeostasis in clinical settings and in preclinical research studies using rodent models. The procedure assesses the ability of the body to clear glucose from the blood in a defined time after a bolus dose. In the human clinical setting, glucose is ingested via voluntary consumption of a glucose-sweetened drink. Typically, in the rodent GTT oral gavage (gavage-oGTT) or (more commonly) intraperitoneal injection (IPGTT) are used to administer the glucose bolus. Although used less frequently, likely due to investigator technical and experience barriers, the former is the more physiologically relevant as it integrates the gastrointestinal tract (GI), including release of key incretin hormones. However, orally gavaging glucose in the GTT is also not without its limitations: gavaging glucose straight into the stomach bypasses potentially critical early glucose-sensing via the mouth (cephalic phase) and associated physiological responses. Furthermore, gavaging is stressful on mice, and this by itself can increase blood glucose levels. We have developed and validated a refined protocol for mouse oral GTT which uses a voluntary oral glucose dosing method, micropipette-guided drug administration (MDA), without the need for water deprivation. This approach is simple and non-invasive. It is less stressful for the mice, as evidenced by lower circulating corticosterone levels 10 minutes after glucose-dosing compared to oral gavage. This is significant for animal and investigator welfare, and importantly minimising the confounding effect of stress on mouse glucose homeostasis. Using a randomised cross-over design, we have validated the MDA approach in the oGTT against oral gavage in male and female C57BL/6J and C57BL/6N mice. We show the ability of this method to detect changes in glucose tolerance in diet-induced obese animals. Compared to oral gavage there was lower inter-animal variation in the MDA-oGTT. In addition to being more representative of the human procedure, the MDA-oGTT is easy and has lower barriers to adoption than the gavage oGTT as it is non-invasive and requires no specialist equipment or operator training. The MDA-oGTT a more clinically representative, accessible, and refined replacement for the gavage-oGTT for mouse metabolic phenotyping, which is simple yet overcomes significant deficiencies in the current standard experimental approaches.
- Published
- 2024
- Full Text
- View/download PDF
18. Regulation of astrocyte metabolism by mitochondrial translocator protein 18kDa.
- Author
-
Firth W, Robb JL, Stewart D, Pye KR, Bamford R, Oguro-Ando A, Beall C, and Ellacott KL
- Abstract
The mitochondrial translocator protein 18kDa (TSPO) has been linked to a variety of functions from steroidogenesis to regulation of cellular metabolism and is an attractive therapeutic target for chronic CNS inflammation. Studies in the periphery using Leydig cells and hepatocytes, as well as work in microglia, indicate that the function of TSPO may vary between cells depending on their specialised roles. Astrocytes are critical for providing trophic and metabolic support in the brain as part of their role in maintaining brain homeostasis. Recent work has highlighted that TSPO expression increases in astrocytes under inflamed conditions and may drive astrocyte reactivity. However, relatively little is known about the role TSPO plays in regulating astrocyte metabolism and whether this protein is involved in immunometabolic processes in these cells. Using TSPO-deficient (TSPO
-/- ) mouse primary astrocytes in vitro (MPAs) and a human astrocytoma cell line (U373 cells), we performed metabolic flux analyses. We found that loss of TSPO reduced basal astrocyte respiration and increased the bioenergetic response to glucose reintroduction following glucopenia, while increasing fatty acid oxidation (FAO). Lactate production was significantly reduced in TSPO-/- astrocytes. Co-immunoprecipitation studies in U373 cells revealed that TSPO forms a complex with carnitine palmitoyltransferase 1a, which presents a mechanism wherein TSPO may regulate FAO in astrocytes. Compared to TSPO+/+ cells, inflammation induced by 3h lipopolysaccharide (LPS) stimulation of TSPO-/- MPAs revealed attenuated tumour necrosis factor release, which was enhanced in TSPO-/- MPAs at 24h LPS stimulation. Together these data suggest that while TSPO acts as a regulator of metabolic flexibility in astrocytes, loss of TSPO does not appear to modulate the metabolic response of astrocytes to inflammation, at least in response to the stimulus/time course used in this study., Competing Interests: Conflict of interest: The authors declare no conflicts of interest.- Published
- 2023
- Full Text
- View/download PDF
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