Diabetes 53:1424-1428, 2004 © 2004 by the American Diabetes Association, Inc. Relationship Between Serum Amyloid A Level and Tanis/SelS mRNA Expression in Skeletal Muscle and Adipose Tissue From Healthy and Type 2 Diabetic Subjects
1 Department of Surgical Science, Karolinska Institutet, Stockholm, Sweden
Tanis is a recently described protein reported to be a putative receptor for serum amyloid A and found to be dysregulated with diabetes in the Israeli sand rat Psamommys obesus. Tanis has also been identified as a selenoprotein, one of the first two identified membrane selenoproteins. We determined mRNA expression of the human homologue of Tanis, SelS/AD-015, in skeletal muscle and adipose tissue biopsies obtained from 10 type 2 diabetic patients and 11 age- and weight-matched healthy subjects. Expression of Tanis/SelS mRNA in skeletal muscle and adipose tissue biopsies was similar between diabetic and control subjects. A subset of subjects underwent a euglycemic-hyperinsulinemic clamp, and adipose tissue expression of Tanis/SelS was determined after in vivo insulin stimulation. Adipose tissue Tanis/SelS mRNA expression was unchanged after insulin infusion in control subjects, whereas Tanis/SelS mRNA increased in seven of eight subjects following insulin stimulation in diabetic subjects. Skeletal muscle and adipose tissue Tanis/SelS mRNA expression were positively correlated with plasma serum amyloid A. In conclusion, there is a strong trend toward upregulation of Tanis/SelS following insulin infusion in adipose tissue from type 2 diabetic subjects. Moreover, the positive relationship between Tanis mRNA and the acute-phase protein serum amyloid A suggests an interaction between innate immune system responses and Tanis expression in muscle and adipose tissue.
Address correspondence and reprint requests to Anna Krook, Integrative Physiology, Department of PhysiologyPharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden. E-mail: anna.krook{at}fyfa.ki.se
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