Assessment the effectiveness of hematopoietic growth factors on hepatic regeneration after partial hepatectomy in albino rats with induced bone marrow suppression

ABSTRACT

This study aimed to evaluate the effect of hematopoietic growth factors [erythropoietin and granulocyte colony stimulating factor] on liver regeneration after partial hepatectomy and bone marrow suppression of rats and to investigate the role of hematopoietic stem cells in liver regeneration by assessment of CD 34+ hematopoietic stem cells marker in hepatic tissues. 36 adult male albino rats were used in this study and were divided into six groups each of 6 rats the 1st is the control group, the 2nd is bone marrow suppression group, 3rd is subjected to partial hepatectomy, 4th is subjected to bone marrow suppression by benzene, then 70% partial hepatectomy, 5th is subjected to 70% partial hepatectomy with injection of Eprex and Neupogen at time of partial hepatectomy, then daily for 5 days post hepatectomy and the 6th group is subjected to bone marrow suppression by benzene first then 70% partial hepatectomy with injection of Eprex and Neupogen daily for 5 days post hepatectomy. Histological evaluation and immunohistochemical study for CD34+ cells in the hepatic tissues were assessed. There were no regenerative changes in both control and benzene treated groups. There were little regenerative changes in the group of partial hepatectomy after benzene treatment but in the groups that were treated with the hematopoietic growth factors. These regenerative changes were increased especially in the treated group after partial hepatectomy than treated group after partial hepatectomy and bone marrow suppression. Immunostaining of CD34 expression as marker of HSCs in liver sections showed the following; the normal group, benzene treated group and partially hepatectomized group after benzene treatment showed no expression, but partially hepatectomized group show focally positive expression. Both groups treated with hematopoietic growth factors either after partial hepatectomy or after partial hepatectomy and bone marrow suppression by benzene show diffusely positive expression. The present study had shown that Erythropoietin and Granulocyte colony stimulating factors stimulate regenerative process occurred in the liver after partial hepatectomy only and after partial hepatectomy with bone marrow suppression either by endogenous mechanisms or by mobilization of hematopoietic stem cells