title: [Bone marrow microvessel density and vascular endothelial growth factor expression in patients with aplastic anemia].
abstract: OBJECTIVE
  To study the bone marrow microvessel density (MVD) and vascular endothelial growth factor (VEGF) expression and their clinical significance in patients with aplastic anemia (AA).
  
  
  METHODS
  Bone marrow biopsies in 51 newly diagnosed patients with AA were evaluated the MVD and VEGF expression by immunostaining with anti-factor VIII related antigen and VEGF monoclonal antibodies at regular time points after immunosuppressive therapy (IT).
  
  
  RESULTS
  The mean bone marrow MVD in AA group was 5.5 +/- 3.5, being significantly lower than that in normal control group (8.7 +/- 3.4, P < 0.05). MVDs of SAA and NSAA patients were 7.4 +/- 2.9 and 4.3 +/- 3.4, respectively, being significantly different (P < 0.01). The VEGF expression in AA group was significantly lower than that in control group [(6.7 +/- 8.4)% vs (14.7 +/- 6.1)%, P < 0.01], but there was no difference between SAA and NSAA. Bone marrow MVD and VEGF were significantly increased after IT in 22 responded AA patients.
  
  
  CONCLUSIONS
  Bone marrow MVD and VEGF expression are low in AA patients which may be one of pathophysiologic mechanisms of bone marrow failure in AA. Proangiogenic and ameliorating microcirculation agents together with IT might accelerate the recovery of hematopoiesis in AA patients.
authors: Institute of Hematology and Blood Diseases Hospital, CAMS & PUMC, Tianjin, China.
authors: Li
authors: L
authors: Zhang
authors: Hui-jun
authors: HJ
authors: Wang
authors: Hong-qiang
authors: HQ
authors: Li
authors: Dong-lin
authors: DL
authors: Yang
authors: Zhang-song
authors: ZS
authors: Yan
authors: Yu-hong
authors: YH
authors: Wu
authors: Kang
authors: K
authors: Zhou
authors: Yu-lin
authors: YL
authors: Chu
authors: Hui-shu
authors: HS
authors: Chen
authors: Feng-kui
authors: FK
authors: Zhang
mesh_terms: D000293:Adolescent; D000328:Adult; D000741:Anemia, Aplastic / Q000378:metabolism / Q000473:pathology*; D001853:Bone Marrow / Q000098:blood supply / Q000378:metabolism; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D055806:Microvessels / Q000473:pathology*; D008875:Middle Aged; D009389:Neovascularization, Pathologic; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism*
chemical_list: D042461:Vascular Endothelial Growth Factor A