Abstract
1. Visfatin (also known as nicotinamide phosphoribosyltransferase or Nampt) is a novel adipokine associated with metabolic abnormalities in obesity and diabetes. The aim of the present study was to determine whether visfatin levels in the circulation and visfatin expression in fat tissues are altered in Lyon hypertensive (LH) rats, a hypertensive strain with numerous metabolic abnormalities, and, if so, to explore the possible correlations between blood visfatin levels and the metabolic abnormalities in LH rats. 2. Male 18-20-week-old LH rats and their control, Lyon normotensive (LN) rats, were used. Blood pressure was recorded in conscious, unrestrained rats. Fat tissue weight was determined. Serum visfatin concentrations were determined by enzyme immunoassay, whereas visfatin expression in fat tissues was determined by western blotting. Relationships between two parameters were evaluated by linear regression analysis. 3. The LH rats had significantly higher bodyweight and fat tissue weight compared with LN rats. Serum lipid levels of total cholesterol (TC), high-density lipoprotein-cholesterol (HDL-C), low-density lipoprotein-cholesterol (LDL-C) and triglyceride (TG) were all significantly higher in LH rats than in LN rats. Moreover, serum visfatin levels were higher in LH rats than in LN rats and were positively correlated with bodyweight, fat tissue weight and serum lipid levels (i.e. TC, HDL-C, LDL-C, TG and the TG:HDL-C ratio). There were no significant differences in serum glucose and insulin concentrations, or in the whole-body insulin resistance index, between LN and LH rats, and serum visfatin levels were not correlated with any of these parameters. Visfatin expression in visceral fat tissue, but not in subcutaneous fat tissue, was markedly upregulated in LH compared with LN rats. 4. In conclusion, the results of the present study demonstrate that serum visfatin levels in LH rats are elevated and are associated with lipid metabolic abnormalities.
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