title: Post-ischemic Intravenous Administration of Allogeneic Dental Pulp-Derived Neurosphere Cells Ameliorated Outcomes of Severe Forebrain Ischemia in Rats.
abstract: Transplantation of bone marrow or adipose-derived mesenchymal stem cells (MSCs) for various neurological disorders has yielded promising results in models of focal cerebral ischemia. Dental pulp stem cells (DPSCs) are a type of MSC. In serum-free culture, they can form neurospheres that contain nestin-positive neuronal progenitor cells. We hypothesized that transplantation of dental pulp-derived neurosphere cells would ameliorate outcomes of global cerebral ischemia, the pathophysiology of which is known to resist conventional treatments. We also hypothesized that transplantation of dental pulp-derived cells would provide some neuroprotection in this pathology due to the presence of DPSCs.
  
  
  
  Using adult rats, ischemia was induced by two-vessel occlusion of both carotid arteries in combination with systemic hypotension. Allogeneic dental pulp cells from juvenile rats were cultured in advance in serum-free medium to obtain neurospheres. Dental pulp-derived neurosphere cells or dental pulp-derived cells were intravenously administered at 3 h after ischemic insult, with normal saline as a control. Animals were observed for 14 days after ischemia. Neurological outcome was assessed using the water-maze test and neuromotor test. Histological outcome was measured by counting the percentage of dead neurons in the hippocampal CA1 and CA3 regions.
  
  
  
  Transplantation of both dental pulp-derived neurosphere cells and dental pulp-derived cells significantly improved survival rate and water-maze test results. Neurosphere cell transplantation was related to significantly better neuromotor test and histological outcomes, as indicated by the reduced percentage of dead neurons in CA1.
  
  
  
  Transplantation of dental pulp-derived neurosphere cells ameliorated outcomes of global cerebral ischemia. It was also demonstrated that dental pulp-derived cell administration provided some neuroprotection.
authors.affiliation: Department of Anesthesiology, Yamagata University School of Medicine, Yamagata, Japan.
authors.forename: Airi
authors.initials: A
authors.lastname: Kumasaka
authors.affiliation: Department of Dental Anesthesiology, School of Dentistry, Health Sciences University of Hokkaido, Kanazawa, Japan.
authors.forename: Kaoru
authors.initials: K
authors.lastname: Kanazawa
authors.affiliation: Department of Dental Anesthesiology, School of Dentistry, Health Sciences University of Hokkaido, Kanazawa, Japan.
authors.forename: Hanako
authors.initials: H
authors.lastname: Ohke
authors.affiliation: School of Human Science and Environment, University of Hyogo, Kobe, Japan.
authors.forename: Ikumi
authors.initials: I
authors.lastname: Miura
authors.affiliation: Department of Dental Anesthesiology, School of Dentistry, Health Sciences University of Hokkaido, Kanazawa, Japan. ymiura@hoku-iryo-u.ac.jp.
authors.forename: Yoshihide
authors.identifier: 0000-0003-1512-5028
authors.initials: Y
authors.lastname: Miura
mesh_terms: D061605:Administration, Intravenous; D000818:Animals; D002545:Brain Ischemia / Q000628:therapy*; D003782:Dental Pulp; D008297:Male; D045164:Mesenchymal Stem Cell Transplantation / Q000379:methods*; D058953:Neural Stem Cells / Q000637:transplantation*; D016548:Prosencephalon / Q000473:pathology*; D051381:Rats; D017207:Rats, Sprague-Dawley
keywords: Dental pulp; Dental pulp stem cells; Global cerebral ischemia; Neurosphere; Rat