生物
安普克
细胞生物学
线粒体
秀丽隐杆线虫
三磷酸腺苷
线粒体DNA
内质网
蛋白激酶A
激酶
遗传学
生物化学
基因
作者
Zhang Hu,Yunan Zhu,Yuji Suehiro,Shohei Mitani,Ding Xue
标识
DOI:10.1073/pnas.2302490120
摘要
Pathological mutations in human mitochondrial genomes (mtDNA) can cause a series of neurological, behavioral, and developmental defects, but the underlying molecular mechanisms are poorly understood. We show here that the energy-sensing adenosine monophosphate (AMP)-activated protein kinase (AMPK) signaling pathway plays a key role in mediating similar defects caused by different mtDNA mutations in Caenorhabditis elegans , including loss or reduction of osmotic, chemical and olfactory sensing, locomotion, and associative learning and memory, as well as increased embryonic lethality. mtDNA mutations cause reduced ATP (adenosine triphosphate) levels, activation of C. elegans AMPK AAK-2, and nuclear translocation of the FOXO transcription factor DAF-16. Activated DAF-16 up-regulates the expression of inositol triphosphate receptor ITR-1, an endoplasmic reticulum calcium channel, leading to increased basal cytosolic Ca 2+ levels, decreased neuronal responsiveness, compromised synapses, and increased embryonic death. Treatment of mtDNA mutants with vitamin MK-4 restores cellular ATP and cytosolic Ca 2+ levels, improves synaptic development, and suppresses sensory and behavioral defects and embryonic death. Our study provides crucial mechanistic insights into neuronal and developmental defects caused by mtDNA mutations and will improve understanding and treatment of related mitochondrial diseases.
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