title: Sca-1+ endothelial cells (SPECs) reside in the portal area of the liver and contribute to rapid recovery from acute liver disease.
abstract: The liver has a high potential to regenerate however, the relation between oval cells and endothelial cells in the portal area during liver regeneration has not been adequately described. We have focused on sca-1+ endothelial cells (SPEC: sca-1+CD31+CD45- cells) and analyzed their localization, growth potential, and the role of these cells in damaged liver. SPECs are localized in the portal area and comprise approximately 20-30% of CD31+CD45- cells. These cells have higher growth potential than sca-1- endothelial cells and grow aggressively when the liver is severely damaged on the lateral side of the oval cells. In an in vivo study we show that when the liver is severely damaged in the presence of a VEGF (vascular endothelial growth factor)-inhibitor, the frequency of SPECs decreased and the recovery of liver volume was also delayed. These results strongly suggest that SPECs play important roles in the recovery of severely damaged liver.
authors.affiliation: Department of Pediatrics, Graduate School of Medicine, Kyoto University, 54 Kawara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan.
authors.forename: Atsunori
authors.initials: A
authors.lastname: Tsuchiya
authors.forename: Toshio
authors.initials: T
authors.lastname: Heike
authors.forename: Shiro
authors.initials: S
authors.lastname: Baba
authors.forename: Hisanori
authors.initials: H
authors.lastname: Fujino
authors.forename: Katsutsugu
authors.initials: K
authors.lastname: Umeda
authors.forename: Yasunobu
authors.initials: Y
authors.lastname: Matsuda
authors.forename: Minoru
authors.initials: M
authors.lastname: Nomoto
authors.forename: Takafumi
authors.initials: T
authors.lastname: Ichida
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Aoyagi
authors.forename: Tatsutoshi
authors.initials: T
authors.lastname: Nakahata
mesh_terms: D000208:Acute Disease; D000818:Animals; D000950:Antigens, Ly / Q000032:analysis*; D042783:Endothelial Cells / Q000737:chemistry / Q000473:pathology* / Q000502:physiology*; D017493:Leukocyte Common Antigens / Q000032:analysis; D008107:Liver Diseases / Q000473:pathology*; D008115:Liver Regeneration; D008565:Membrane Proteins / Q000032:analysis*; D051379:Mice; D008810:Mice, Inbred C57BL; D019408:Platelet Endothelial Cell Adhesion Molecule-1 / Q000032:analysis; D011168:Portal System / Q000473:pathology* / Q000502:physiology*; D042461:Vascular Endothelial Growth Factor A / Q000037:antagonists & inhibitors
chemical_list: D000950:Antigens, Ly; C074650:Ly6a protein, mouse; D008565:Membrane Proteins; D019408:Platelet Endothelial Cell Adhesion Molecule-1; D042461:Vascular Endothelial Growth Factor A; D017493:Leukocyte Common Antigens