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Mitophagy protects ? cells from inflammatory damage in diabetes.


ABSTRACT: Inflammatory damage contributes to ? cell failure in type 1 and 2 diabetes (T1D and T2D, respectively). Mitochondria are damaged by inflammatory signaling in ? cells, resulting in impaired bioenergetics and initiation of proapoptotic machinery. Hence, the identification of protective responses to inflammation could lead to new therapeutic targets. Here, we report that mitophagy serves as a protective response to inflammatory stress in both human and rodent ? cells. Utilizing in vivo mitophagy reporters, we observed that diabetogenic proinflammatory cytokines induced mitophagy in response to nitrosative/oxidative mitochondrial damage. Mitophagy-deficient ? cells were sensitized to inflammatory stress, leading to the accumulation of fragmented dysfunctional mitochondria, increased ? cell death, and hyperglycemia. Overexpression of CLEC16A, a T1D gene and mitophagy regulator whose expression in islets is protective against T1D, ameliorated cytokine-induced human ? cell apoptosis. Thus, mitophagy promotes ? cell survival and prevents diabetes by countering inflammatory injury. Targeting this pathway has the potential to prevent ? cell failure in diabetes and may be beneficial in other inflammatory conditions.

SUBMITTER: Sidarala V 

PROVIDER: S-EPMC7819751 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature

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Inflammatory damage contributes to β cell failure in type 1 and 2 diabetes (T1D and T2D, respectively). Mitochondria are damaged by inflammatory signaling in β cells, resulting in impaired bioenergetics and initiation of proapoptotic machinery. Hence, the identification of protective responses to inflammation could lead to new therapeutic targets. Here, we report that mitophagy serves as a protective response to inflammatory stress in both human and rodent β cells. Utilizing in vivo mitophagy re  ...[more]

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