Abstract
These experiments were undertaken to study the effects of cyclosporine A (CsA) on liver regeneration after an isogeneic orthotopic reduced-size hepatic transplantation (RSHT) in rats. Male Wistar rats were treated with or without a daily injection of CsA beginning 24 hr before surgery and were subjected to a 68% partial hepatectomy. A isogeneic orthotopic reduced-size hepatic transplantation was performed in recipient rats pretreated with or without CsA. A daily injection of CsA was continued until the recipient rats were sacrificed. Animals were sacrificed at various time points (12, 24, 36, 48, and 72 hr) postoperatively. The incorporation of bromodeoxyuridine (BrdU) into the DNA of the remnant hepatocytes was evaluated by immunohistochemical staining with a monoclonal antibody against BrdU. CsA (10 mg/kg/day) significantly augmented BrdU incorporation into hepatocytes after hepatectomy. The maximum labeling index (LI) was observed at 24 hr after hepatectomy. In contrast, the maximum LI in the recipient rats not receiving CsA was seen at 36 hr after RSHT, and 10 mg/kg/day of CsA decreased the LI at 36 hr after RSHT. A lower dose of CsA (3 mg/kg/day), however, significantly increased the LI in the recipient rats (P<0.01), and it reached a peak at 24 hr after RSHT when compared to the transplant recipients not receiving CsA. The time course of the increase in the LI in the transplant recipient rats receiving 3 mg/kg/day of CsA was similar to that observed in the rats after hepatectomy. This dosage improved the delay in the reduced-size hepatic transplant LI reaching its peak. These findings suggest that after RSHT the liver graft is more sensitive to both hepatotrophic and hepatotoxic effects of CsA.
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This work was supported in part by Mika Fund.
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Kikuchi, N., Yamaguchi, Y., Mori, K. et al. Effect of cyclosporine on liver regeneration after orthotopic reduced-size hepatic transplantation in the rat. Digest Dis Sci 38, 1492–1499 (1993). https://doi.org/10.1007/BF01308610
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DOI: https://doi.org/10.1007/BF01308610