Endoplasmic reticulum stress-mediated programmed cell death in the tumor microenvironment.

Area of Science:

• Oncology
• Cell Biology
• Molecular Biology

Background:

• Endoplasmic reticulum stress (ERS) is a cellular state arising from the accumulation of unfolded proteins within the endoplasmic reticulum.
• The unfolded protein response (UPR) comprises three key signaling pathways: PERK, IRE1α, and ATF6, which regulate cellular adaptation or death.
• ERS plays a critical role in the tumor microenvironment (TME), influencing cancer cell survival and death.

Purpose of the Study:

• To elucidate the molecular mechanisms of the "ERS-Death Axis" in cancer.
• To explore the interconnectedness of ERS-mediated cell death pathways (apoptosis, autophagy, pyroptosis, ferroptosis).
• To review therapeutic strategies targeting the ERS-Death Axis and identify clinical translation challenges.

Main Methods:

• Review of existing literature on ERS, UPR, and cancer cell death.
• Analysis of molecular pathways involved in ERS-mediated cell fate decisions.
• Examination of preclinical and clinical data on therapeutic interventions.

Main Results:

• The ERS-Death Axis integrates apoptosis, autophagy, pyroptosis, and ferroptosis through specific molecular mediators like CHOP, NLRP3 inflammasome, and ATF4-CHAC1.
• Oxidative stress exacerbates the functions of this network.
• Significant tumor-specific heterogeneity exists within the ERS-Death Axis.
• Therapeutic strategies including UPR modulation, natural compounds, combination therapies, and nanodelivery show potential.

Conclusions:

• The ERS-Death Axis is a critical regulator of cell fate in the TME, offering a promising target for cancer therapy.
• Overcoming challenges like tumor heterogeneity and drug delivery is essential for clinical translation.
• Further research into tumor-specific mechanisms will optimize combination regimens and advance precision oncology.