alexa Correlation between cyclosporine-induced nephrotoxicity in reduced nephron mass and expression of kidney injury molecule-1 and aquaporin-2 gene.
Pharmaceutical Sciences

Pharmaceutical Sciences

Journal of Clinical & Experimental Pharmacology

Author(s): Hong ME, Hong JC, Stepkowski S, Kahan BD

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Abstract Sirolimus (SRL) has been shown to exacerbate cyclosporine (CsA)-induced nephrotoxicity. The expression of the kidney injury molecule-1 (KIM-1) is markedly upregulated in the postischemic rat kidney. We sought to correlate drug-induced nephrotoxicity and the expression of KIM-1 and aquaporin-2 (AQP-2) in male PVG rats with 2 kidneys (2K), 1 kidney (1K), and half a kidney (1/2K) treated with SRL alone, CsA alone, or a combination of both (SRL-CsA). After 7 days of treatment, the 2K group treated with SRL-CsA showed a significant decrease in creatinine clearance compared with the 2K SRL alone and 2K CsA alone groups (1.2 vs 2.47 vs 2.46 mL/min; P < .001). There was a trend toward deterioration of creatinine clearance in the 1K and 1/2K groups treated with SRL-CsA. The KIM-1 expression in the 2K SRL-CsA group was significantly upregulated compared with that in the 2K SRL alone and 2K CsA alone groups (P = .02). The AQP-2 expression was comparable in the 3 groups. After 1 week of treatment washout, the 2K, 1K, and 1/2K groups treated with SRL alone demonstrated a significantly higher creatinine clearance rate than did the groups treated with SRL-CsA (P = .04, P = .02, and P = .004). The expression of KIM-1 and AQP-2 was similar among the treatment groups. SRL-CsA-induced nephrotoxicity resulted in overexpression of KIM-1, suggesting injury to the proximal tubule. Treatment with SRL alone may enable earlier reversal of tubular injury. This article was published in Transplant Proc and referenced in Journal of Clinical & Experimental Pharmacology

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