Abstract:
:Adiponutrin is one of three recently identified adipocyte lipases. Surprisingly, these proteins also retain transacylase activity, a hitherto unknown pathway of triacylglycerol synthesis in the adipocytes. This may enable them to participate in both anabolic and catabolic processes. The adiponutrin gene (ADPN) is downregulated by fasting and upregulated by refeeding, suggesting a role in lipogenesis. Experiments in human adipocytes confirmed that the gene is upregulated in response to insulin in a glucose-dependent fashion. Obese subjects had increased levels of subcutaneous and visceral abdominal adipose tissue ADPN mRNA. Visceral ADPN mRNA expression was correlated to measures of insulin sensitivity (fasting insulin and homeostasis model assessment). We also studied genetic variation in ADPN and its relation to obesity, lipolysis, and mRNA expression. Two ADPN polymorphisms showed association with obesity. Carriers of the obesity-associated variants showed a lesser increase in the levels of adipose tissue ADPN mRNA and an increased basal lipolysis. Our results suggest that obese subjects that are insulin resistant and/or carriers of the obesity-associated ADPN alleles fail to upregulate the gene and that upregulation of adiponutrin may be an appropriate response to orchestrate energy excess.
journal_name
Diabetesjournal_title
Diabetesauthors
Johansson LE,Hoffstedt J,Parikh H,Carlsson E,Wabitsch M,Bondeson AG,Hedenbro J,Tornqvist H,Groop L,Ridderstråle Mdoi
10.2337/diabetes.55.03.06.db05-1075subject
Has Abstractpub_date
2006-03-01 00:00:00pages
826-33issue
3eissn
0012-1797issn
1939-327Xpii
55/3/826journal_volume
55pub_type
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