Knockout of inositol-requiring enzyme 1α in pro-opiomelanocortin neurons decreases fat mass via increasing energy expenditure.
Although numerous functions of inositol-requiring enzyme 1α (IRE1α) have been identified, a role of IRE1α in pro-opiomelanocortin (POMC) neurons in the arcuate nucleus of the hypothalamus is largely unknown. Here, we showed that mice lacking IRE1α specifically in POMC neurons (PIKO) are lean and resistant to high-fat diet-induced obesity and obesity-related insulin resistance, liver steatosis and leptin resistance. Furthermore, PIKO mice had higher energy expenditure, probably due to increased thermogenesis in brown adipose tissue. Additionally, α-melanocyte-stimulating hormone production was increased in the hypothalamus of PIKO mice. These results demonstrate that IRE1α in POMC neurons plays a critical role in the regulation of obesity and obesity-related metabolic disorders. Our results also suggest that IRE1α is not only an endoplasmic reticulum stress sensor, but also a new potential therapeutic target for obesity and obesity-related metabolic diseases.
['Xiao|Yuzhong|Y|', 'Xia|Tingting|T|', 'Yu|Junjie|J|', 'Deng|Yalan|Y|', 'Liu|Hao|H|', 'Liu|Bin|B|', 'Chen|Shanghai|S|', 'Liu|Yong|Y|', 'Guo|Feifan|F|0000-0001-6748-4546']
D000818:Animals D059305:Diet, High-Fat D004722:Endoribonucleases D004734:Energy Metabolism D055786:Gene Knockout Techniques D007031:Hypothalamus D051379:Mice D009474:Neurons D009765:Obesity D011333:Pro-Opiomelanocortin D017346:Protein Serine-Threonine Kinases D022722:Thermogenesis D013851:Thinness D000521:alpha-MSH
inositol-requiring enzyme 1α pro-opiomelanocortin neurons hypothalamus obesity leptin sensitivity