title: Erythropoietin promotes the repair effect of acute kidney injury by bone-marrow mesenchymal stem cells transplantation.
abstract: Bone-marrow mesenchymal stem cells (BMSCs) transplantation is effective for acute kidney injury (AKI) repair but with limited efficiency. In the present study, BMSCs marked by bromodeoxyuridine (BrdU) were transplanted to the AKI mouse model with erythropoietin (EPO) being subcutaneously injected. The blood urea nitrogen (BUN) and serum creatinine (Scr) levels, pathological changes, distribution of BMSCs, expressions of the cytokeratin 18 (CK18) and the stromal cell-derived factor 1 (SDF-1) in the nephridial tissues were measured. The directional migration of BMSCs to the AKI microenvironment in vitro was also tested. The results showed that BMSCs transplantation or EPO injection alone decreased the BUN and Scr levels and the acute tubular necrosis (ATN) scoring in varied degrees. The combination of these decreased the above indicators' levels significantly. BrdU(+) cells (BMSCs) were observed in the AKI nephridial tissues, and CK18 expressed in the cytoplasm of these cells. EPO injection increased the proportion of BrdU(+) cells with the enhanced expression of SDF-1 in the AKI nephridial tissues. EPO increased the migrating number of BMSCs to the AKI microenvironment in vitro, and additional anti-SDF-1 treatment with SDF-1 antibody neutralized this effect. Our results showed that EPO increased the number of the transplanted BMSCs in the injured nephridial tissues and enhanced the AKI repair effect of BMSCs transplantation. The enhanced kidney-homing efficiency for BMSCs mediated by the SDF-1/CXCR4 pathway is one of the possible mechanisms for EPO performance.
authors.affiliation: Department of Nephrology, 455th hospital of PLA, Shanghai 200052, China.
authors.forename: Nanmei
authors.initials: N
authors.lastname: Liu
authors.forename: Guofeng
authors.initials: G
authors.lastname: Han
authors.forename: Jin
authors.initials: J
authors.lastname: Cheng
authors.forename: Jian
authors.initials: J
authors.lastname: Huang
authors.forename: Jun
authors.initials: J
authors.lastname: Tian
mesh_terms: D058186:Acute Kidney Injury / Q000473:pathology / Q000628:therapy*; D000818:Animals; D001853:Bone Marrow / Q000378:metabolism; D002465:Cell Movement / Q000502:physiology; D002478:Cells, Cultured; D004195:Disease Models, Animal; D004921:Erythropoietin / Q000494:pharmacology*; D045164:Mesenchymal Stem Cell Transplantation / Q000379:methods; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL
chemical_list: D004921:Erythropoietin
keywords: Bone-marrow mesenchymal stem cells; acute kidney injury; erythropoietin; stromal derived factor-1; transplantation