Heterogeneous Development of ß-Cell Populations in Diabetes-Resistant and -Susceptible Mice.
Diabetes
; 71(9): 1962-1978, 2022 09 01.
Article
en En
| MEDLINE
| ID: mdl-35771990
ABSTRACT
Progressive dysfunction and failure of insulin-releasing ß-cells are a hallmark of type 2 diabetes (T2D). To study mechanisms of ß-cell loss in T2D, we performed islet single-cell RNA sequencing of two obese mouse strains differing in their diabetes susceptibility. With mice on a control diet, we identified six ß-cell clusters with similar abundance in both strains. However, after feeding of a diabetogenic diet for 2 days, ß-cell cluster composition markedly differed between strains. Islets of diabetes-resistant mice developed into a protective ß-cell cluster (Beta4), whereas those of diabetes-prone mice progressed toward stress-related clusters with a strikingly different expression pattern. Interestingly, the protective cluster showed indications of reduced ß-cell identity, such as downregulation of GLUT2, GLP1R, and MafA, and in vitro knockdown of GLUT2 in ß-cells-mimicking its phenotype-decreased stress response and apoptosis. This might explain enhanced ß-cell survival of diabetes-resistant islets. In contrast, ß-cells of diabetes-prone mice responded with expression changes indicating metabolic pressure and endoplasmic reticulum stress, presumably leading to later ß-cell loss. In conclusion, failure of diabetes-prone mice to adapt gene expression toward a more dedifferentiated state in response to rising blood glucose levels leads to ß-cell failure and diabetes development.
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Islotes Pancreáticos
/
Diabetes Mellitus Tipo 2
/
Células Secretoras de Insulina
Límite:
Animals
Idioma:
En
Revista:
Diabetes
Año:
2022
Tipo del documento:
Article
País de afiliación:
Alemania