Academic Journal
Ghrelin does not impact the blunted counterregulatory response to recurrent hypoglycemia in mice
| العنوان: | Ghrelin does not impact the blunted counterregulatory response to recurrent hypoglycemia in mice |
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| المؤلفون: | Kripa Shankar, Salil Varshney, Deepali Gupta, Bharath K. Mani, Sherri Osborne-Lawrence, Nathan P. Metzger, Corine P. Richard, Jeffrey M. Zigman |
| المصدر: | Frontiers in Endocrinology, Vol 14 (2023) |
| بيانات النشر: | Frontiers Media S.A. |
| سنة النشر: | 2023 |
| المجموعة: | Directory of Open Access Journals: DOAJ Articles |
| مصطلحات موضوعية: | ghrelin, hypoglycemia-associated autonomic failure, hypoglycemia unawareness, counterregulation, mouse models, Blood glucose, Diseases of the endocrine glands. Clinical endocrinology, RC648-665 |
| الوصف: | IntroductionRecurrent episodes of insulin-induced hypoglycemia in patients with diabetes mellitus can result in hypoglycemia-associated autonomic failure (HAAF), which is characterized by a compromised response to hypoglycemia by counterregulatory hormones (counterregulatory response; CRR) and hypoglycemia unawareness. HAAF is a leading cause of morbidity in diabetes and often hinders optimal regulation of blood glucose levels. Yet, the molecular pathways underlying HAAF remain incompletely described. We previously reported that in mice, ghrelin is permissive for the usual CRR to insulin-induced hypoglycemia. Here, we tested the hypothesis that attenuated release of ghrelin both results from HAAF and contributes to HAAF.MethodsC57BL/6N mice, ghrelin-knockout (KO) + control mice, and GhIRKO (ghrelin cell-selective insulin receptor knockout) + control mice were randomized to one of three treatment groups: a “Euglycemia” group was injected with saline and remained euglycemic; a 1X hypoglycemia (“1X Hypo”) group underwent a single episode of insulin-induced hypoglycemia; a recurrent hypoglycemia (“Recurrent Hypo”) group underwent repeated episodes of insulin-induced hypoglycemia over five successive days.ResultsRecurrent hypoglycemia exaggerated the reduction in blood glucose (by ~30%) and attenuated the elevations in plasma levels of the CRR hormones glucagon (by 64.5%) and epinephrine (by 52.9%) in C57BL/6N mice compared to a single hypoglycemic episode. Yet, plasma ghrelin was equivalently reduced in “1X Hypo” and “Recurrent Hypo” C57BL/6N mice. Ghrelin-KO mice exhibited neither exaggerated hypoglycemia in response to recurrent hypoglycemia, nor any additional attenuation in CRR hormone levels compared to wild-type littermates. Also, in response to recurrent hypoglycemia, GhIRKO mice exhibited nearly identical blood glucose and plasma CRR hormone levels as littermates with intact insulin receptor expression (floxed-IR mice), despite higher plasma ghrelin in GhIRKO mice.ConclusionsThese data suggest that the usual ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 1664-2392 |
| Relation: | https://www.frontiersin.org/articles/10.3389/fendo.2023.1181856/full; https://doaj.org/toc/1664-2392; https://doaj.org/article/c2e91af14828475f8d4b0bbd5b8abc10 |
| DOI: | 10.3389/fendo.2023.1181856 |
| الاتاحة: | https://doi.org/10.3389/fendo.2023.1181856 https://doaj.org/article/c2e91af14828475f8d4b0bbd5b8abc10 |
| رقم الانضمام: | edsbas.4C820270 |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 16642392 |
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| DOI: | 10.3389/fendo.2023.1181856 |