pVHL-mediated regulation of the anti-angiogenic protein thrombospondin-1 decreases migration of Clear Cell Renal Carcinoma Cell Lines

Sci Rep. 2020 Jan 24;10(1):1175. doi: 10.1038/s41598-020-58137-w.

Abstract

Thrombospondin-1 (TSP-1) is a multifunctional matrix protein with antitumor activities due in part to its ability to inhibit angiogenesis, which in turn contributes to determine the fate of many tumours. Previous studies have shown that TSP-1 expression supports normal kidney angiostasis, and decreased TSP-1 levels contribute to the angiogenic phenotype of renal cell carcinomas (RCC). The loss of the von Hippel-Lindau tumour suppressor gene (VHL) in these tumours favours stabilization of the Hypoxia Inducible Factors (HIF), which in turn contribute to adapt tumour cells to hostile environments promoting tumour progression. However, HIF-independent regulation of certain genes might also be involved. We have previously shown that TSP-1 is regulated in hypoxia in clear cell RCC (ccRCC) in a HIF-independent manner; however, the effect of VHL protein (pVHL) on TSP-1 expression has not been evaluated. Our results proved that pVHL loss or mutation in its alpha or beta domain significantly decreased TSP-1 levels in ccRCC in a HIF-independent manner. Furthermore, this regulation proved to be important for ccRCC cells behaviour showing that decreased TSP-1 levels rendered ccRCC cells more migratory. This data substantiates a unique regulation pattern for TSP-1 in a pVHL-dependent manner, which may be relevant in the aggressiveness of ccRCC.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carcinoma, Renal Cell / pathology*
  • Cell Line, Tumor
  • Cell Movement
  • Culture Media, Serum-Free
  • Down-Regulation
  • Gene Expression Regulation, Neoplastic*
  • Gene Knockdown Techniques
  • Humans
  • Hypoxia-Inducible Factor 1, alpha Subunit / physiology
  • Intercellular Junctions / metabolism
  • Kidney Neoplasms / pathology*
  • Mutation, Missense
  • Neoplasm Invasiveness
  • Neoplasm Proteins / biosynthesis
  • Neoplasm Proteins / genetics
  • Neoplasm Proteins / physiology*
  • Protein Domains / genetics
  • RNA Interference
  • RNA, Messenger / biosynthesis
  • RNA, Messenger / genetics
  • RNA, Neoplasm / biosynthesis
  • RNA, Neoplasm / genetics
  • RNA, Small Interfering / genetics
  • Thrombospondin 1 / biosynthesis*
  • Thrombospondin 1 / genetics
  • Von Hippel-Lindau Tumor Suppressor Protein / antagonists & inhibitors
  • Von Hippel-Lindau Tumor Suppressor Protein / genetics
  • Von Hippel-Lindau Tumor Suppressor Protein / physiology*

Substances

  • Culture Media, Serum-Free
  • HIF1A protein, human
  • Hypoxia-Inducible Factor 1, alpha Subunit
  • Neoplasm Proteins
  • RNA, Messenger
  • RNA, Neoplasm
  • RNA, Small Interfering
  • Thrombospondin 1
  • Von Hippel-Lindau Tumor Suppressor Protein
  • VHL protein, human