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ITPR1 protects renal cancer cells against natural killer cells by inducing autophagy

Yosra Messai1, Muhammad Zaeem Noman1, Meriem Hasmim1

  • 1INSERM U753, Villejuif, France.

Cancer Research
|October 10, 2014
PubMed

Insights

Hypoxia-inducible factor 2-alpha (HIF2α) promotes clear cell renal cell carcinoma (RCC) survival by upregulating inositol 1,4,5-trisphosphate receptor type 1 (ITPR1), hindering natural killer cell activity. Targeting this axis enhances anti-tumor immunity.

Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • Clear cell renal cell carcinoma (RCC) often involves von Hippel-Lindau (VHL) gene inactivation, increasing hypoxia-inducible factors (HIFs).
  • The role of HIF2α in modulating natural killer (NK) cell-mediated cytotoxicity in RCC remains largely unexplored.

Purpose of the Study:

  • To investigate the role of HIF2α in regulating RCC susceptibility to NK cell-mediated killing.
  • To identify novel molecular targets within the HIF2α pathway that influence RCC immune evasion.

Main Methods:

  • Utilized VHL-mutated (786-0) and VHL-corrected (WT7) RCC cell lines to assess NK cell lysis.
  • Employed gene expression profiling and chromatin immunoprecipitation assays to identify HIF2α targets.
  • Investigated the impact of ITPR1 modulation on autophagy and granzyme B activity.
  • Evaluated in vivo tumor regression following ITPR1 targeting.

Main Results:

  • VHL-mutated RCC cells exhibited resistance to NK cell lysis, dependent on HIF2α stabilization.
  • Identified inositol 1,4,5-trisphosphate receptor type 1 (ITPR1) as a direct HIF2α target, with its overexpression contributing to NK resistance.
  • Targeting ITPR1 or Beclin-1 modulated autophagy and enhanced granzyme B activity in target cells.
  • In vivo targeting of ITPR1 significantly promoted NK-mediated tumor regression.

Conclusions:

  • HIF2α promotes RCC cell survival by upregulating ITPR1, which mediates resistance to NK cell killing via autophagy regulation.
  • The HIF2α/ITPR1 axis represents a novel pathway linking tumor hypoxia, immune evasion, and survival in RCC.
  • Targeting the HIF2α/ITPR1 pathway holds therapeutic potential for enhancing anti-tumor immunity in RCC.

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