title: Osteogenic potential of human calcitonin gene-related peptide alpha gene-modified bone marrow mesenchymal stem cells.
abstract: BACKGROUND
  Most of the basic and clinical studies of osteonecrosis of the femoral head (ONFH) are restricted to bone tissues only, whereas various systems are involved in the onset and development of ONFH, including nervous system. Peptidergic nerve participates in the neuronal regulation of bone metabolism and anabolism, and plays key roles in the growth, repair and reconstruction of bone. Calcitonin gene-related peptide (CGRP), which is secreted by peptidergic nerve, is the main mediator of bone metabolism. It dramatically promotes the proliferation and osteogenic differentiation of bone marrow mesenchymal stem cells (BMSCs). Additionally, it enhances the osteoblast mass and the rate of osteoblast formation, and reduces the bone resorption by acting on osteoblasts and osteoclasts. Hence, we aimed to construct recombinant retrovirus vector pLNCX(2)-hCGRPα and to investigate the proliferation and osteogenic potential of hCGRPα-producing BMSCs (BMSCs/pLNCX(2)-hCGRPα) after virus infection.
  
  
  METHODS
  The constructed recombinant retrovirus vector pLNCX(2)-hCGRPα was transfected into PT67 packaging cells by lipofectamine 2000. Virus was collected for BMSCs infection. The mRNA and protein expression of hCGRPα was examined by reverse transcription polymerase chain reaction (RT-PCR) and Western blotting, respectively. The cell proliferation was determined by methyl thiazoleterazolium (MTT) assay. The osteogenic potential of BMSCs was evaluated by alkaline phosphatase (ALP) activity.
  
  
  RESULTS
  Both mRNA and protein expression of hCGRPα was detected in BMSCs/pLNCX(2)-hCGRPα cells. These cells exhibited significantly elevated proliferation and ALP value as compared with control BMSCs (P < 0.05).
  
  
  CONCLUSIONS
  BMSCs/pLNCX(2)-hCGRPα cells could stably express hCGRPα and showed promoted proliferation ability and osteogenic potential as compared with control BMSCs.
authors.affiliation: Department of Orthopaedics, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China. wangyisheng@zzu.edu.cn
authors.forename: Yi-Sheng
authors.initials: YS
authors.lastname: Wang
authors.forename: Ya-Han
authors.initials: YH
authors.lastname: Wang
authors.forename: Guo-Qiang
authors.initials: GQ
authors.lastname: Zhao
authors.forename: Yue-Bai
authors.initials: YB
authors.lastname: Li
mesh_terms: D000469:Alkaline Phosphatase / Q000235:genetics / Q000378:metabolism; D000818:Animals; D015153:Blotting, Western; D001854:Bone Marrow Cells / Q000166:cytology*; D015740:Calcitonin Gene-Related Peptide / Q000235:genetics / Q000378:metabolism*; D002454:Cell Differentiation / Q000235:genetics / Q000502:physiology; D049109:Cell Proliferation; D002478:Cells, Cultured; D006801:Humans; D059630:Mesenchymal Stem Cells / Q000166:cytology*; D010012:Osteogenesis / Q000235:genetics / Q000502:physiology*; D011817:Rabbits; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D000469:Alkaline Phosphatase; D015740:Calcitonin Gene-Related Peptide