Abstract:
OBJECTIVE:Adiponectin is one of several important, metabolically active cytokines secreted from adipose tissue. Epidemiologic studies have associated low circulating levels of this adipokine with multiple metabolic disorders including obesity, insulin resistance, type II diabetes, and cardiovascular disease. To investigate how enhanced adiponectin-mediated changes in metabolism in vivo, we generated transgenic mice which specifically overexpress the gene coding for adiponectin receptor 1 (AdipoR1) in mouse macrophages using the human scavenger receptor A-I gene (SR-AI) enhancer/promoter. We found that macrophage-specific AdipoR1 transgenic mice (AdR1-TG) presented reduced whole body weight, fat accumulation and liver steatosis when these transgenic mice were fed with a high fat diet. Moreover, these macrophage AdR1-TG mice exhibited enhanced whole-body glucose tolerance and insulin sensitivity with reduced proinflammatory cytokines, MCP-1 and TNF-α, both in the serum and in the insulin target metabolic tissues. Additional studies demonstrated that these macrophage AdR1-TG animals exhibited reduced macrophage foam cell formation in the arterial wall when these transgenic mice were crossed with a low-density lipoprotein receptor (Ldlr) deficient mouse model. CONCLUSIONS:These results suggest that AdipoR1 overexpressed in macrophages can physiologically modulate metabolic activities in vivo by enhancing adiponectin actions in distal metabolically active tissues. The AdipoR1 modified macrophages provide unique interactions with the residented tissues/cells, suggesting a novel role of macrophage adiponectin receptor in improving metabolic disorders in vivo.
journal_name
Atherosclerosisjournal_title
Atherosclerosisauthors
Luo N,Chung BH,Wang X,Klein RL,Tang CK,Garvey WT,Fu Ydoi
10.1016/j.atherosclerosis.2013.02.026subject
Has Abstractpub_date
2013-05-01 00:00:00pages
124-35issue
1eissn
0021-9150issn
1879-1484pii
S0021-9150(13)00136-6journal_volume
228pub_type
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