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Recent studies have reported that dipeptidyl-peptitase IV (DPP-IV) is correlated with diabetic conditions and also with dyslipidemia caused by overnutrition, especially a high fat diet. However, the role of DPP-IV in diabetes during dyslipidemia has been unclear. We utilized a lymph fistula rat model to determine whether intestinal lymph, which absorbs dietary fats, is affected by a chronic high-fat and high-cholesterol diet (HFHC). HFHC diet rats showed significantly higher DPP-IV activity in intestinal lymph and plasma compared to rats receiving a normal chow diet. In addition, HFHC diet rats showed significantly increased DPP-IV mRNA expression in the intestine. However, DPP-IV mRNA in the lymphocytes isolated from intestinal lymph and mesenteric lymph nodes did not show significant differences from that in the normal diet rats. In conclusion, HFHC diets increased DPP-IV expression in intestinal lymph; these results indicate the applicability of a previously unrecognized role for DPP-IV in metabolic disorders, including diabetes.

High Fat and High Cholesterol Diet Induces DPP-IV Activity in Intestinal Lymph