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Hypoxia negatively regulates heparan sulfatase 2 expression in renal cancer cell lines
Authors:Khurana Ashwani  Tun Han W  Marlow Laura  Copland John A  Dredge Keith  Shridhar Viji
Affiliation:Department of Experimental Pathology, Mayo Clinic College of Medicine, Rochester, MN 55905, USA.
Abstract:Inactivation of von Hippel-Lindau (VHL), a tumor suppressor gene is often associated with clear cell renal cell carcinoma (ccRCC). VHL inactivation leads to multitude of responses including enhanced growth factor signaling such as bFGF2, SDF-1α, and HGF. Here, we have identified a novel VHL-inducible gene, heparan sulfatase 2 (HSulf-2) that attenuates heparan-binding growth factor such as bFGF2 signaling. VHL-mediated HIF-1 alpha degradation was essential to restore HSulf-2 expression. Mechanistically, HSulf-2 negatively regulated vimentin expression and knockdown of vimentin abolished cell migration. This study reveals a novel layer of regulation of heparan-binding growth factor signaling via modulation of heparan sulfate by HSulf-2 in ccRCC.
Keywords:heparan sulfatase 2  growth factor  cell migration  VHL
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