Abstract
The protective effect of dietary protein restriction on the development and expression of immune-mediated interstitial nephritis was evaluated in Brown Norway rats with anti-tubular basement membrane disease. In the first series of experiments, pair-fed rats received low protein (LP) (3% casein) or normal protein (NP) (27% casein), normocaloric diets. After 6 wk, each group was immunized with renal tubular antigen in adjuvant to produce anti-tubular basement membrane antibody (alpha TBM-Ab) and tubulointerstitial nephritis. The kidneys harvested from NP rats after four more weeks on the diet had histologically more severe interstitial disease than the LP rats (histologic severity; NP = 3.1 +/- 0.2 vs. LP = 1.1 +/- 0.3; P less than 0.001), and serum creatinine values were concordantly different (NP = 1.34 +/- 0.02 vs. LP = 0.82 +/- 0.03). Titers of alpha TBM-Ab were similar in both groups, while the T cell-mediated immune response, as measured by delayed-type hypersensitivity (DTH), was nonspecifically impaired in LP rats when compared with the NP group. Admixture cotransfers of LP plus NP cells failed to demonstrate active suppression as an explanation for the depressed DTH in LP rats. The therapeutic role of dietary protein restriction was also examined in rats with established alpha TBM disease. In these experiments, rats were first immunized and fed NP diets for 4 wk (histologic severity = 3.0 +/- 0.2; creatinine = 1.78 +/- 0.02), and then were divided into two groups and followed for six more weeks on either LP or NP diets. LP rats, under these conditions, developed less disease than those fed NP diet (histologic severity; NP = 3.2 +/- 0.3 vs. LP = 1.4 +/- 0.2; P less than 0.001), and serum creatinine values were concordantly different (NP = 1.92 +/- 0.05 vs. LP = 0.97 +/- 0.02). Again, the titers of alpha TBM-Ab in both LP and NP groups were similar. These data collectively suggest that LP diet has a protective effect both on the development and extent of tubulointerstitial nephritis that is perhaps, in part, related to the selective abrogation of effector T cell immunity.
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