The Journal of Experimental Medicine
ReproCELL
  Home | Help | Feedback | Subscriptions | Archive | Search | Table of Contents

Published online 30 April 2001.
This Article
Right arrow Full Text
Right arrow Full Text (PDF, 650K)
Right arrow Alert me when this article is cited
Right arrow Citation Map
Services
Right arrow Email this article
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new content in the JEM
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via CrossRef
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Hattori, K.
Right arrow Articles by Rafii, S.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Hattori, K.
Right arrow Articles by Rafii, S.
Social Bookmarking
 Add to CiteULike   Add to Complore   Add to Connotea   Add to Del.icio.us   Add to Digg   Add to Reddit   Add to Technorati  
What's this?
© The Rockefeller University Press, 0022-1007/2001/5/1005/ $5.00
The Journal of Experimental Medicine, Volume 193, Number 9, May 7, 2001 1005-1014


Original Article

Vascular Endothelial Growth Factor and Angiopoietin-1 Stimulate Postnatal Hematopoiesis by Recruitment of Vasculogenic and Hematopoietic Stem Cells

Koichi Hattoria,c, Sergio Diasa, Beate Heissiga, Neil R. Hackettb, David Lydenc, Masatoshi Tatenod, Daniel J. Hickline, Zhenping Zhue, Larry Wittee, Ronald G. Crystalb, Malcolm A.S. Moorec, and Shahin Rafiia
a Division of Hematology-Oncology, Critical Care Medicine and Genetic Medicine Program, Cornell University Medical College, New York, New York 10021
b Division of Pulmonary, Critical Care Medicine and Genetic Medicine Program, Cornell University Medical College, New York, New York 10021
c Sloan-Kettering Institute for Cancer Research, New York, New York 10021
d Department of Pathology, Sapporo City General Hospital, Sapporo 060-8604, Japan
e ImClone Systems Inc., New York, New York 10014

Correspondence to: Shahin Rafii, Cornell University Medical College, Division of Hematology-Oncology, 1300 York Ave., Rm. C-606, New York, NY 10021. Tel:212-746-2070 Fax:212-746-8866 E-mail:srafii{at}mail.med.cornell.edu.

Tyrosine kinase receptors for angiogenic factors vascular endothelial growth factor (VEGF) and angiopoietin-1 (Ang-1) are expressed not only by endothelial cells but also by subsets of hematopoietic stem cells (HSCs). To further define their role in the regulation of postnatal hematopoiesis and vasculogenesis, VEGF and Ang-1 plasma levels were elevated by injecting recombinant protein or adenoviral vectors expressing soluble VEGF165, matrix-bound VEGF189, or Ang-1 into mice. VEGF165, but not VEGF189, induced a rapid mobilization of HSCs and VEGF receptor (VEGFR)2+ circulating endothelial precursor cells (CEPs). In contrast, Ang-1 induced delayed mobilization of CEPs and HSCs. Combined sustained elevation of Ang-1 and VEGF165 was associated with an induction of hematopoiesis and increased marrow cellularity followed by proliferation of capillaries and expansion of sinusoidal space. Concomitant to this vascular remodeling, there was a transient depletion of hematopoietic activity in the marrow, which was compensated by an increase in mobilization and recruitment of HSCs and CEPs to the spleen resulting in splenomegaly. Neutralizing monoclonal antibody to VEGFR2 completely inhibited VEGF165, but not Ang-1–induced mobilization and splenomegaly. These data suggest that temporal and regional activation of VEGF/VEGFR2 and Ang-1/Tie-2 signaling pathways are critical for mobilization and recruitment of HSCs and CEPs and may play a role in the physiology of postnatal angiogenesis and hematopoiesis.

Key Words: vascular endothelial growth factor, angiopoietin-1, angiogenesis, hematopoiesis, tyrosine kinase receptors


Add to CiteULike CiteULike   Add to Complore Complore   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati    What's this?


This article has been cited by other articles:



  Home | Help | Feedback | Subscriptions | Archive | Search
TABLE OF CONTENTS