Sarangarajan R, Cacini W. Early onset of cisplatin-induced nephrotoxicity in streptozotocin-diabetic rats treated with insulin.
Basic Clin Pharmacol Toxicol 2004;
95:66-71. [PMID:
15379782 DOI:
10.1111/j.1742-7843.2004.950204.x]
[Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
Mechanism of protection against cisplatin nephrotoxicity in streptozotocin-diabetic rats is unclear but is associated with decreased renal platinum accumulation. This study was designed to determine whether normalization of hyperglycaemia by insulin treatment to six week streptozotocin-diabetic rats reversed protection against cisplatin nephrotoxicity. Male Sprague-Dawley rats divided into 3 groups (n=10/group) (1) non-diabetic (2) untreated streptozotocin-diabetic and (3) insulin-treated streptozotocin-diabetic groups were rendered diabetic using streptozotocin (65 mg/kg body weight, intravenous). At the end of 6 weeks, Group 3 animals were treated with insulin (subcutaneously) for 21 days to normalize glucose. After 21 days of insulin treatment, the mean +/- S.D. plasma glucose (mg%) in Group 3 animals at 144.8 +/- 22.03, was significantly lower than Group 2 animals (412 +/- 24.69) and comparable to age-matched non-diabetic (Group 1) animals. Blood urea nitrogen at 24 hr after intraperitoneal administration of cisplatin (5 mg/kg body weight) increased by a factor 2.5 in Group 3 compared to 1.1 and 1.3 in Group 1 and Group 2 animals respectively. In the same animals, at 96 hr the blood area nitrogen increased by a factor of 3.2 and 2.9 in Group 1 and Group 3 respectively compared to 1.14 for Group 2 animals. Renal platinum levels in Group 1, Group 2 and Group 3 after 96 hr after cisplatin administration were 6.92 +/- 0.83, 3.46 +/- 0.77 & 6.20 +/- 0.64 (microg/g wet weight of tissue) respectively. Results indicate that 21 day insulin treatment to streptozotocin-diabetic animal reverses protection against cisplatin toxicity. Moreover, insulin treatment increased the susceptibility of streptozotocin-diabetic rats to cisplatin-induced renal toxicity.
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