title: Improved expression of gamma-aminobutyric acid receptor in mice with cerebral infarct and transplanted bone marrow stromal cells: an autoradiographic and histologic analysis.
abstract: Recent studies have indicated that bone marrow stromal cells (BMSC) have the potential to improve neurologic function when transplanted into animal models of central nervous system disorders. However, how the transplanted BMSC restore the lost neurologic function is not clear. In the present study, therefore, we aimed to elucidate whether BMSC express the neuron-specific gamma-aminobutyric acid (GABA) receptor when transplanted into brain that has been subjected to cerebral infarction.
  
  
  METHODS
  The BMSC were harvested from green fluorescent protein-transgenic mice and were cultured. The mice were subjected to permanent middle cerebral artery occlusion. The BMSC or vehicle was transplanted into the ipsilateral striatum 7 d after the insult. Using autoradiography and fluorescence immunohistochemistry, we evaluated the binding of 125I-iomazenil and the expression of GABA receptor protein in and around the cerebral infarct 4 wk after transplantation.
  
  
  RESULTS
  Binding of 125I-iomazenil was significantly higher in the periinfarct neocortex in the BMSC-transplanted animals than in the vehicle-transplanted animals. Likewise, the number of the GABAA receptor-positive cells was significantly higher in the periinfarct neocortex in the BMSC-transplanted animals than in the vehicle-transplanted animals. A certain subpopulation of the transplanted BMSC expressed a neuron-specific marker, microtubule-associated protein 2, and the marker protein specific for GABAA receptor in the periinfarct area.
  
  
  CONCLUSIONS
  These findings suggest that BMSC may contribute to neural tissue regeneration through migrating toward the periinfarct area and acquiring the neuron-specific receptor function.
authors.affiliation: Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
authors.forename: Hideo
authors.initials: H
authors.lastname: Shichinohe
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kuroda
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Yano
authors.forename: Takako
authors.initials: T
authors.lastname: Ohnishi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tamagami
authors.forename: Kazutoshi
authors.initials: K
authors.lastname: Hida
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Iwasaki
mesh_terms: D000818:Animals; D001921:Brain / Q000000981:diagnostic imaging / Q000378:metabolism / Q000473:pathology; D002544:Cerebral Infarction / Q000000981:diagnostic imaging / Q000378:metabolism* / Q000473:pathology / Q000601:surgery*; D018380:Hematopoietic Stem Cell Transplantation; D006412:Hematopoietic Stem Cells / Q000000981:diagnostic imaging / Q000378:metabolism* / Q000473:pathology; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D011877:Radionuclide Imaging; D017154:Stromal Cells / Q000000981:diagnostic imaging / Q000378:metabolism* / Q000473:pathology / Q000637:transplantation*; D016896:Treatment Outcome; D005680:gamma-Aminobutyric Acid / Q000378:metabolism*
chemical_list: D005680:gamma-Aminobutyric Acid