Colchicine antimitosis causes progression of S-(1,2-dichlorovinyl)-L-cysteine-induced injury leading to acute renal failure and death in mice.
Objective of the present study was to test the importance of tissue repair in the final outcome of S-(1,2-dichlorovinyl)-L-cysteine (DCVC)-induced nephrotoxicity using colchicine (CLC) intervention. Male Swiss Webster (SW) mice were administered a normally nonlethal dose of DCVC (30 mg/kg, i.p.) on day 0 and CLC (2 mg/kg, i.p.) at 42 and 66 h after administration of DCVC. The mice were observed for mortality and various renal injury and repair parameters were studied during a time course of 0-14 days. Administration of 30 mg DCVC/kg led to loss of renal architecture by day 1, which sustained until day 5, and regressed thereafter to reach normal architecture by day 10 resulting in 100% survival. Renal dysfunction as assessed by increases in plasma BUN and creatinine levels was concordant during this time course. Urinary volume increased significantly between days 10 and 14 with significant increases in urinary glucose concentrations on days 1-4. Calpain leakage increased from day 1 and remained so until day 5 before declining at later time points. In contrast, CLC intervention led to marked inhibition of S-phase DNA synthesis and 100% mortality by 120 h. H&E sections of kidneys revealed loss of renal architecture on day 1 which progressively worsened from day 2 to 4. Polyuria and glycosuria were evident during the first 2 and 3 days, respectively. Calpain immunohistochemistry revealed progressive leakage of calpain in the extracellular space during 2-4 days which lead to increased renal injury as evident from significant increases in calpain specific breakdown products (CSBPs) of alpha-fodrin during the same period of time. The group of mice receiving 2 mg CLC/kg alone showed a significant increase in urinary creatinine concentration on day 5. Neither the expression nor localization of aquaporin 1 was altered in any of the treatment groups. These results show that antimitotic intervention after DCVC-initiated renal injury leads to expansion and progression of that injury, which appears to be due to proteolytic destruction of neighboring cells mediated by calpain leaking out of necrosed renal tubular epithelial cells.[1]References
- Colchicine antimitosis causes progression of S-(1,2-dichlorovinyl)-L-cysteine-induced injury leading to acute renal failure and death in mice. Reddy, R.N., Latendresse, J.R., Mehendale, H.M. Toxicology (2006) [Pubmed]
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