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Effect of Interleukin-11 on Ameliorating Intestinal Damage After Methotrexate Treatment of Breast Cancer in Rats

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Abstract

Gastrointestinal mucositis after cancer chemotherapy is an increasing problem that is essentially untreatable once established, although it gradually remits. The aim of this study was to investigate the time-course and effect of interleukin-11 (IL-11) on apoptosis and intestinal morphometry as measures of mucositis. Female DA rats were implanted subcutaneously with syngeneic breast cancer and treated with methotrexate (MTX). Intestinal morphometry was used to assess villus area, crypt length, and mitotic count per crypt. Apoptosis was assessed by TUNEL assay in the tumor and jejunum. Tumor proliferation was assessed by mitotic count. The time-course study showed that MTX increased apoptosis by 28-fold in the crypts of the small intestine and by 3-fold in the tumor, and peaked at 6 hr after chemotherapy. IL-11 (100 μg/kg/ twice daily subcutaneously) maintained intestinal weight, and reduced the severity of mucositis, as measured by villus area, crypt length, and mitotic count per crypt. IL-11 at higher doses (200 μg and 400 μg/kg/twice daily subcutaneously), did not further improve villus area, crypt length, and mitotic count per crypt. IL-11 did not affect tumor apoptosis or proliferation. We conclude that IL-11 attenuated mucositis by maintaining intestinal weight and morphometry. IL-11 did not prevent apoptosis, but rather induced compensatory crypt cell proliferation.

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Gibson, R.J., Keefe, D.M., Thompson, F.M. et al. Effect of Interleukin-11 on Ameliorating Intestinal Damage After Methotrexate Treatment of Breast Cancer in Rats. Dig Dis Sci 47, 2751–2757 (2002). https://doi.org/10.1023/A:1021061306913

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