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  • Title: L-Arginine does not affect renal morphology and cell survival in ischemic acute renal failure in rats.
    Author: Raff U, Schneider R, Gambaryan S, Seibold S, Reber M, Vornberger N, Freund R, Schramm L, Wanner C, Galle J.
    Journal: Nephron Physiol; 2005; 101(3):p39-50. PubMed ID: 15990449.
    Abstract:
    BACKGROUND: L-Arginine (L-Arg), a substrate of nitric oxide synthases, improves renal function in ischemic acute renal failure (iARF). We evaluated whether L-Arg improves renal morphology and cell survival in the course of iARF. METHODS AND RESULTS: iARF was induced in rats by bilateral clamping of renal arteries for 45 min. L-Arg was applied intraperitoneally during clamping, and orally during 14 days of follow-up. Morphology and cell survival of renal cortical and medullar tissue was analyzed on days 1, 3, 7, and 14 of follow-up, using toluidine blue staining and immunohistochemistry of perfusion-fixated tissue, and Western blot analysis of tissue homogenate. Renal tubular injury showed typical features of necrosis and was most severe on days 1 and 3 after clamping, predominantly in S3 segments, with almost complete recovery by day 14. Enhanced medullar monocyte infiltration, determined by ED-1 expression as well as by immunohistochemistry, and enhanced expression of proliferating cell nuclear antigen (PCNA), indicative of proliferation and regeneration, accompanied these morphological changes. Compared to controls, L-Arg had no impact on renal morphology, ED-1, and PCNA expression. Furthermore, expression of markers of apoptosis Bcl-2, Bax, and cleaved caspase-3 was only slightly increased in iARF rats, compared to sham-operated animals, and was also not influenced by L-Arg. CONCLUSION: Despite its repeatedly reported positive impact on renal function as also shown in our model, L-Arg does not alter cell death and proliferation in the course of iARF in our model. Thus, different mechanisms have to be considered, in particular improved intrarenal hemodynamics.
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