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Published on: January 19, 2019
Programmed cell death in lung cancer: mechanisms, immune responses, and therapeutics
Yang Liu1, Qingxin Chen1, Jiayu Xu2
1Clinical Medical College, Southwest Medical University, Luzhou, 646000, China.
Abstract:
Lung cancer remains the leading cause of cancer-related mortality worldwide, with an estimated 2.2 million new cases and 1.8 million deaths in 2020. Despite improvements achieved through cytotoxic chemotherapy and immune checkpoint blockade, survival outcomes for many patients remain unsatisfactory, largely due to tumour immune-evasion and resistance to immunotherapy. In this context, programmed cell death (PCD) pathways-especially apoptosis, pyroptosis, ferroptosis and necroptosis-play central roles in shaping tumour cell fate, modulating the tumour immune microenvironment, and influencing therapeutic response. Apoptosis typically proceeds via caspase-mediated dismantling and is often immune-tolerogenic, whereas pyroptosis, ferroptosis and necroptosis provoke danger signals, inflammation and potent dendritic cell and T-cell activation, thus serving as immunogenic cell death modalities. Reciprocal crosstalk between these PCD types and the immune system determines whether lung tumours remain "cold" (immune-excluded) or become "hot" (immune-inflamed). Importantly, targeting these classical PCD mechanisms-either alone or in combination with immunotherapy-emerges as a promising strategy to overcome immune resistance in lung cancer by converting non-responsive tumours into immune-sensitive states. This review synthesises mechanistic insights into how apoptosis, pyroptosis, ferroptosis and necroptosis regulate antitumour immunity in lung cancer and outlines therapeutic opportunities for targeting PCD to enhance immunotherapy efficacy and overcome immune-resistant phenotypes.
Insights
Targeting programmed cell death (PCD) pathways like apoptosis, pyroptosis, ferroptosis, and necroptosis can enhance lung cancer immunotherapy. These PCD types modulate the tumor immune microenvironment, potentially overcoming resistance and improving patient survival.
Area of Science:
- Oncology
- Immunology
- Cell Biology
Background:
- Lung cancer is a leading cause of cancer mortality globally, with current treatments facing limitations due to tumor immune evasion and resistance.
- Programmed cell death (PCD) pathways, including apoptosis, pyroptosis, ferroptosis, and necroptosis, are critical in determining tumor cell fate and immune response.
- The interplay between PCD and the immune system influences whether lung tumors are immunologically
- hot
- (inflamed) or
- cold
- (excluded).
Purpose of the Study:
- To review the mechanistic insights into how different PCD pathways regulate anti-tumor immunity in lung cancer.
- To outline therapeutic opportunities for targeting PCD to enhance immunotherapy efficacy.
- To explore strategies for overcoming immune resistance in lung cancer by modulating PCD.
Main Methods:
- This review synthesizes existing literature on programmed cell death pathways and their role in lung cancer immunity.
- Mechanistic insights into apoptosis, pyroptosis, ferroptosis, and necroptosis in the context of anti-tumor immunity were analyzed.
- Therapeutic strategies targeting PCD for enhancing immunotherapy were identified and discussed.
Main Results:
- Apoptosis is often immune-tolerogenic, while pyroptosis, ferroptosis, and necroptosis act as immunogenic cell death modalities, provoking inflammatory danger signals.
- These PCD pathways critically influence the tumor immune microenvironment, affecting the transition between
- cold
- and
- hot
- tumors.
- Targeting PCD mechanisms offers a promising strategy to convert non-responsive tumors into immune-sensitive states.
Conclusions:
- Modulating programmed cell death pathways is a key strategy to overcome immune evasion and resistance in lung cancer.
- Targeting specific PCD pathways, alone or in combination with immunotherapy, can enhance treatment efficacy.
- Harnessing the immunogenic potential of pyroptosis, ferroptosis, and necroptosis may significantly improve outcomes for lung cancer patients.
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