Effect of G-CSF and TPO on HIBD in neonatal rats

ABSTRACT

Objective:To observe effect of granulocyte colony-stimulating factor(G-CSF) and restructure human thrombopoietin on hypoxic-ischemic brain damage(HIBD) in new born rats.Methods:A total of60 neonatalSD rats were selected and divided into4 groups, with15 in each group.Group A served as control group.Rats ofGroupsB-D were prepared forHIBD model by ligation of left common carotid artery combined with hypoxia method.Rats ofGroupA were only completed with free left common carotid artery without ligation and hypoxia operation.AfterHIBD model preparation,GroupB was administrated with subcutaneous injection of normal saline for placebo treatment;GroupC was administrated with cervical subcutaneous injection of0.5 μg/10 g granulocyte colony stimulating factor(G-CSF) for5 d(Once a day);GroupD was administrated with intraperitoneal injection of15U/10 g recombinant human thromobopoietin(rhTPO) for treatment.After modeling for7,14 and21 d,5 rats were sacrificed in each group, respectively. Brain quality damage(%) conditions of experimental animals in each group were compared in different time points, and cerebral histopathological changes of each group were observed. Expression of nestin in rats of each group was detected by immunohistochemical method. Results:After modeling for7,14 and21 d, brain quality damages(%) ofGroupsB,C andD were significant higher than that of inGroupA(P0.05). Conclusions:BothG-CSF andTPO can protect the nervous system ofHIBD neonatal rats. G-CSF can promote the proliferation and differentiation of neural precursor cells to decrease the degeneration and necrosis of nerve cell.TPO can obviously ameliorate morphology index ofHIBD rats.Through regulating ratio ofTIMP-1 andMMP-9,TPO can maintain the integrity of blood brain barrier to relieve the occurrence of brain damage.