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Area of Science:

  • Cellular Biology
  • Cancer Research
  • Molecular Signaling

Background:

  • The unfolded protein response (UPR) is a critical cellular pathway that maintains endoplasmic reticulum (ER) homeostasis by sensing and responding to misfolded proteins.
  • Cancer cells frequently experience ER stress due to various intrinsic and extrinsic factors, activating the UPR for survival and adaptation.
  • The UPR has dual roles, promoting cell survival under manageable stress but initiating cell death when stress is irreversible.

Purpose of the Study:

  • To review the multifaceted role of the unfolded protein response (UPR) in cancer cell biology and tumor progression.
  • To explore the potential of targeting the UPR as a therapeutic strategy against malignancies.
  • To discuss the balance between UPR's prosurvival and prodeath functions in the context of cancer.

Main Methods:

  • Literature review of recent evidence on ER stress and UPR signaling in cancer.
  • Analysis of the UPR's impact on cancer cell adaptation, immune cell modulation, and cytokine production.
  • Discussion of therapeutic strategies targeting UPR pathways in cancer treatment.

Main Results:

  • Cancer cells exhibit a high susceptibility to ER stress due to compromised proteostasis.
  • The UPR contributes to cancer cell survival, proliferation, and immune evasion.
  • Evidence suggests that modulating UPR signaling, either by inhibiting its adaptive functions or promoting its cell death pathways, can impact tumor growth.

Conclusions:

  • The UPR is a critical determinant of cancer cell fate, with context-dependent prosurvival or prodeath outcomes.
  • Targeting the UPR represents a promising avenue for novel cancer therapies, exploiting cancer cells' inherent vulnerability to ER stress.
  • Further research is warranted to elucidate the precise mechanisms and optimize therapeutic interventions targeting the UPR in various cancer types.