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10.1111/micc.12192

http://scihub22266oqcxt.onion/10.1111/micc.12192
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C4532430!4532430!25660131
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suck abstract from ncbi


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pmid25660131      Microcirculation 2015 ; 22 (4): 257-66
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  • Obesity alters the peripheral circadian clock in the aorta and microcirculation #MMPMID25660131
  • Nernpermpisooth N; Qiu S; Mintz JD; Suvitayavat W; Thirawarapan S; Rudic DR; Fulton DJ; Stepp DW
  • Microcirculation 2015[May]; 22 (4): 257-66 PMID25660131show ga
  • Perturbation of daily rhythm increases cardiovascular risk. The aim of this study was to determine whether obesity alters circadian gene expression and microvascular function in lean mice and obese (db/db) mice. Mice were subjected to normal light-dark cycle or constant darkness (DD) to alter circadian rhythm. Metabolic parameters and microvascular vasoreactivity were evaluated. Array studies were conducted in the AM and PM cycles to assess the rhythmicity of the entire genomics. Rhythmic expression of specific clock genes (Bmal1, Clock, Npas2, Per1, Per2, and Cry1), clock output genes (dbp), and vascular relaxation-related genes (eNOS, GTPCH1) were assessed. Obesity was associated with metabolic dysfunction and impaired endothelial dilation in the microvasculature. Circadian rhythm of gene expression was suppressed 80% in both macro- and microcirculations of obese mice. Circadian disruption with DD increased fasting serum glucose and HbA1C in obese but not lean mice. Endothelium-dependent dilation was attenuated in obese mice and in lean mice subjected to DD. Rhythmic expression of per1 and dbp was depressed in obesity. Expression of eNOS expression was suppressed and GTPCH1 lost rhythmic expression both in obesity and by constant darkness. These results suggest that obesity reduces circadian gene expression in concert with impaired endothelial function. The causal relationship remains to be determined.
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