期刊
DIABETES
卷 57, 期 1, 页码 77-85出版社
AMER DIABETES ASSOC
DOI: 10.2337/db07-0599
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资金
- NCI NIH HHS [P30 CA046592] Funding Source: Medline
- NHLBI NIH HHS [T32 HL07853-06] Funding Source: Medline
- NIDDK NIH HHS [P60 DK20572, DK62876, R01 DK062876] Funding Source: Medline
- NIGMS NIH HHS [R01-GM39561] Funding Source: Medline
- NATIONAL CANCER INSTITUTE [P30CA046592] Funding Source: NIH RePORTER
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [T32HL007853] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF DIABETES AND DIGESTIVE AND KIDNEY DISEASES [R01DK062876, R56DK062876, P60DK020572] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM039561] Funding Source: NIH RePORTER
OBJECTIVE-Guanine nucleotide binding protein (G protein)mediated signaling plays major roles in endocrine/metabolic function. Regulators of G protein signaling (RGSs, or RGS proteins) are responsible for the subsecond turn off of G protein signaling and are inhibitors of signal transduction in vitro, but the physiological function of RGS proteins remains poorly defined in part because of functional redundancy. RESEARCH DESIGN AND METHODS-We explore the role of RGS proteins and G alpha(i2) in the physiologic regulation of body weight and glucose homeostasis by studying genomic knock-in mice expressing RGS-insensitive G alpha(i2) with a G184S mutation that blocks RGS protein binding and GTPase acceleration. RESULTS-Homozygous G alpha(G184S)(i2) knock-in mice show slightly reduced adiposity. On a high-fat diet, male G alpha(G184S)(i2) mice are resistant to weight gain, have decreased body fat, and are protected from insulin resistance. This appears to be a result of increased energy expenditure. Both male and female G alpha(G184S)(i2) mice on a high-fat diet also exhibit enhanced insulin sensitivity and increased glucose tolerance despite females having similar weight gain and adiposity compared with wild-type female mice. CONCLUSIONS-RGS proteins and G alpha(i2), signaling play important roles in the control of insulin sensitivity and glucose metabolism. Identification of the specific RGS proteins involved might permit their consideration as potential therapeutic targets for obesity-related insulin resistance and type 2 diabetes.
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