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This study is intended to clarify the influence of exogenous bovine lactoferrin (bLf) treatment on glycemic homeostasis, gene expression, and production of lactoferrin (Lf) in rats with experimentally induced diabetes. Fifty adult male rats were used; 15 rats were used as the normal control rats (group A) and were injected an intraperitoneal (I/P) with 1 ml of isotonic saline daily for 3 months. Thirty-five rats were administered I/P injection of 60 mg of streptozotocin per kilogram body weight to induce diabetes. Thirty streptozotocin-treated rats were selected and used as diabetic rats, and they were subdivided into 2 equal groups (15 rats each): the untreated diabetic group (group B) and treated diabetic group (group C). The rats in the diabetic group were administered an I/P injection of 1 ml of isotonic saline daily for 3 months, while rats in the diabetic treatment group were administered an I/P injection of 300 mg of bLf/kg body weight/day/3 months. At the end of the experiment, blood and renal tissue samples were collected from all rats. The levels of insulin, glucose, and lactoferrin in plasma were measured. Homeostatic model assessment for insulin resistance (HOMA-IR) was performed. The numbers of Lf-mRNA copies in renal tissue were assessed using quantitative RT-PCR. To measure Lf production in renal tissue, Western blot analysis was applied. The obtained data demonstrated that the treatment of diabetic rats with bLf maintained glycemic homeostasis at normal levels but increased the mRNA expression of renal Lf. In diabetic rats, bovine lactoferrin treatment offers the potential for protection against incidences of insulin resistance (IR) by stimulating the suppressed expression and production of the LTF gene.

Gene expression of renal lactoferrin and glycemic homeostasis in diabetic rats with reference to the protective role of exogenous bovine lactoferrin