Liu CT, Chen KM, Lee SH, Tsai LJ. Effect of supplemental l-arginine on the function of T lymphocytes and the formation of advanced glycosylated end products in rats with streptozotocin-induced diabetes.
Nutrition 2005;
21:615-23. [PMID:
15850969 DOI:
10.1016/j.nut.2004.09.020]
[Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2004] [Accepted: 09/03/2004] [Indexed: 02/02/2023]
Abstract
OBJECTIVE
We investigated the effect of supplemental L-arginine on lymphocyte function in diabetes and its association with suppressed formation of advanced glycosylated end products (AGEs).
METHODS
For the in vivo study, rats with streptozotocin-induced (65 mg/kg of body weight, intravenously) diabetes were treated with or without 2% L-arginine or glycine (as a positive control) in drinking water for 8 wk. We then measured serum fructosamine concentrations and concanavalin A-induced proliferative ability of lymphocytes from these animals. For the in vitro study, AGEs derived from albumin were prepared by incubating D-glucose (200 mmol/L) and bovine serum albumin (100 mg/mL) at 37 degrees C for 2 wk in the presence or absence of L-arginine (0.1-10 mmol/L). These preparations were quantified for their bovine serum albumin--derived AGE content, and their effect on concanavalin A-induced proliferative activity of T lymphocyte from normal rats was measured.
RESULTS
Serum fructosamine concentrations were significantly higher in the diabetic rats than in the control rats (P<0.05) but were significantly lowered with L-arginine supplementation (P<0.05). The lower lymphocyte proliferation rate found in the diabetic rats was reversed by supplemental L-arginine (P<0.05). During the course of incubation of bovine serum albumin with D-glucose, the presence of L-arginine prevented the formation of bovine serum albumin-derived AGEs and attenuated their inhibitory effect on the rate of lymphocyte proliferation in a dose-dependent manner.
CONCLUSION
Supplemental L-arginine improved the function of T lymphocytes in diabetic rats in association with decreased formation of AGEs.
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