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In addition to its well-recognized ability to provoke acute renal dysfunction by promoting intense renal vasoconstriction, cyclosporine produces a chronic tubulointerstitial nephropathy characterized by striped interstitial fibrosis in humans. With a model of chronic cyclosporine nephropathy in which striped fibrosis develops in the uninephrectomized salt-depleted rat, the relationship between renal functional impairment and structural changes was studied during cyclosporine treatment and after its withdrawal in order to ascertain the natural history of this lesion. Groups of uninephrectomized rats maintained on a salt-depleted (-NaCl) or salt-replete (+NaCl) diet were treated with cyclosporine, 15 mg/kg per day, or vehicle by sc injection. GFR and morphology were assessed at 14 and 28 days of treatment and at intervals up to 28 days after drug withdrawal. Although GFR was similarly depressed in cyclosporine-treated animals on either diet (P   0.05 versus cyclosporine/+NaCl) but prominent tubulointerstitial injury persisted and, in some instances, even progressed (P &lt; 0.001 versus cyclosporine/+NaCl and vehicle). Thus, sodium intake emerges as an important determinant of structural tubulointerstitial changes, whereas reductions in GFR during cyclosporine therapy are equivalent in sodium-depleted or sodium-replete animals.

Dissociation of glomerular filtration rate from tubulointerstitial fibrosis in experimental chronic cyclosporine nephropathy