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Mitochondrial dynamics is associated with mitochondrial function, which is associated with diabetes. Although an important indicator of the mitochondrial unfolded protein response, to the best of our knowledge,  CLPP  and its effects on mitochondrial dynamics in islet cells have not been studied to date. We analyzed the effects of  CLPP  on mitochondrial dynamics and mitochondrial function in the mice islet β-cell line Min6 under high glucose and high fat conditions. Min6 cells were assigned to: Normal, HG, HG+NC, HG+si CLPP , HF, HF+NC and HF+ si CLPP  groups. High glucose and high fat can promote the mRNA and protein expression of  CLPP  in mitochondria. The increase of mitochondrial fission, the decrese of mitochondrial fusion, and the damage of mintocondrial ultrastructure were significant in the si CLPP  cell groups as compared to no-si CLPP  treated groups. Meanwhile, mitochondrial functions of MIN6 cells treated with si CLPP  were impaired, such as ATP decreased, ROS increased, mitochondrial membrane potential decreased. In addition, cell insulin secretion decreased and cell apoptosis rate increased in si CLPP  groups. These results revealed that mitochondrial unfolded protein response gene CLPP  alleviated high glucose and high fat-induced mitochondrial dynamics imbalance and mitochondrial dysfunction.

Mitochondrial unfolded protein response gene CLPP changes mitochondrial dynamics and affects mitochondrial function