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Angiogenesis

, Volume 15, Issue 3, pp 457–468 | Cite as

Endothelial cell-fatty acid binding protein 4 promotes angiogenesis: role of stem cell factor/c-kit pathway

  • Harun Elmasri
  • Elisa Ghelfi
  • Chen-wei Yu
  • Samantha Traphagen
  • Manuela Cernadas
  • Haiming Cao
  • Guo-Ping Shi
  • Jorge Plutzky
  • Mustafa Sahin
  • Gokhan Hotamisligil
  • Sule Cataltepe
Original Paper

Abstract

Fatty acid binding protein 4 (FABP4) plays an important role in regulation of glucose and lipid homeostasis as well as inflammation through its actions in adipocytes and macrophages. FABP4 is also expressed in a subset of endothelial cells, but its role in this cell type is not known. We found that FABP4-deficient human umbilical vein endothelial cells (HUVECs) demonstrate a markedly increased susceptibility to apoptosis as well as decreased migration and capillary network formation. Aortic rings from FABP4−/− mice demonstrated decreased angiogenic sprouting, which was recovered by reconstitution of FABP4. FABP4 was strongly regulated by mTORC1 and inhibited by Rapamycin. FABP4 modulated activation of several important signaling pathways in HUVECs, including downregulation of P38, eNOS, and stem cell factor (SCF)/c-kit signaling. Of these, the SCF/c-kit pathway was found to have a major role in attenuated angiogenic activity of FABP4-deficient ECs as provision of exogenous SCF resulted in a significant recovery in cell proliferation, survival, morphogenesis, and aortic ring sprouting. These data unravel a novel pro-angiogenic role for endothelial cell-FABP4 and suggest that it could be exploited as a potential target for diseases associated with pathological angiogenesis.

Keywords

Angiogenesis Endothelial cells FABP4 Rapamycin c-Kit Stem cell factor 

Notes

Acknowledgments

This study was supported by the American Heart Association (11GRNT4900002), Brigham and Women’s Hospital Biomedical Research Institute, Peabody Foundation, and William F. Milton Fund, Harvard University (to SC), Children’s Hospital Boston Translational Research Program (to MS), and Clinical Translational Science Award (UL1RR025758) to Harvard University and Brigham and Women’s Hospital from the National Center for Research Resources. Samantha Traphagen was supported by 5T32HD007466 (Principal Investigator: Dr. Stella Kourembanas). The authors would like to thank to Marcia Filip, R.N. for her effort with collection of umbilical cord specimens.

Supplementary material

10456_2012_9274_MOESM1_ESM.doc (8.7 mb)
Supplementary material 1 (DOC 8892 kb)

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Harun Elmasri
    • 1
  • Elisa Ghelfi
    • 1
  • Chen-wei Yu
    • 1
  • Samantha Traphagen
    • 1
  • Manuela Cernadas
    • 2
  • Haiming Cao
    • 3
  • Guo-Ping Shi
    • 2
  • Jorge Plutzky
    • 2
  • Mustafa Sahin
    • 4
  • Gokhan Hotamisligil
    • 3
  • Sule Cataltepe
    • 1
  1. 1.Division of NeonatologyBrigham and Women’s Hospital, Harvard Medical SchoolBostonUSA
  2. 2.Department of MedicineBrigham and Women’s Hospital, Harvard Medical SchoolBostonUSA
  3. 3.Department of Genetics and Complex DiseasesHarvard School of Public HealthBostonUSA
  4. 4.Department of Neurology, The F.M. Kirby Neurobiology CenterChildren’s Hospital Boston, Harvard Medical SchoolBostonUSA

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