Abstract
Introduction
Irinotecan (CPT-11) is an inhibitor of DNA topoisomerase I and is clinically effective against several cancers. A major toxic effect of CPT-11 is delayed diarrhea; however, the exact mechanism by which the drug induces diarrhea has not been established.
Purpose
Elucidate the mechanisms of induction of delayed diarrhea and determine the effects of the cytokine production inhibitor pentoxifylline (PTX) and thalidomide (TLD) in the experimental model of intestinal mucositis, induced by CPT-11.
Materials and methods
Intestinal mucositis was induced in male Swiss mice by intraperitoneal administration of CPT-11 (75 mg/kg) daily for 4 days. Animals received subcutaneous PTX (1.7, 5 and 15 mg/kg) or TLD (15, 30, 60 mg/kg) or 0.5 ml of saline daily for 5 and 7 days, starting 1 day before the first CPT-11 injection. The incidence of delayed diarrhea was monitored by scores and the animals were sacrificed on the 5th and 7th experimental day for histological analysis, immunohistochemistry for TNF-α and assay of myeloperoxidase (MPO) activity, tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β) and KC ELISA.
Results
CPT-11 caused significant diarrhea, histopathological alterations (inflammatory cell infiltration, loss of crypt architecture and villus shortening) and increased intestinal tissue MPO activity, TNF-α, IL-1β and KC level and TNF-α immuno-staining. PTX inhibited delayed diarrhea of mice submitted to intestinal mucositis and reduced histopathological damage, intestinal MPO activity, tissue level of TNF-α, IL-1β and KC and TNF-α immuno-staining. TLD significantly reduced the lesions induced by CPT-11 in intestinal mucosa, decreased MPO activity, TNF-α tissue level and TNF-α immuno-staining, but did not reduce the severity of diarrhea.
Conclusion
These results suggest an important role of TNF-α, IL-1β and KC in the pathogenesis of intestinal mucositis induced by CPT-11.
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Acknowledgments
The authors thank Maria Silvandira França Pinheiro, Department of Physiology and Pharmacology, and José Ivan Rodrigues de Sousa, Department of Morphology, Faculty of Medicine, Federal University of Ceará, Brazil. This work was supported by the Brazilian Agency for Scientific and Technological Development (CNPq).
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Melo, M.L.P., Brito, G.A.C., Soares, R.C. et al. Role of cytokines (TNF-α, IL-1β and KC) in the pathogenesis of CPT-11-induced intestinal mucositis in mice: effect of pentoxifylline and thalidomide. Cancer Chemother Pharmacol 61, 775–784 (2008). https://doi.org/10.1007/s00280-007-0534-4
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DOI: https://doi.org/10.1007/s00280-007-0534-4