Study finds cancer cells may become more vulnerable when hiding from immune system
7 reported
Scientists at Baylor College of Medicine and the University of Michigan have published research in Nature Immunology that challenges a long-standing principle in immunology. The study, led by Dr. Pavan Reddy and Dr. Arul Chinnaiyan, found that when cancer cells reduce or eliminate a key immune-recognition molecule called MHC I—a common tactic to avoid detection by CD8+ “killer” T cells—they may become more susceptible to attack by CD4+ “helper” T cells. The researchers discovered that these CD4+ T cells can trigger ferroptosis, a form of cell death driven by iron-dependent oxidative stress, in cancer cells with low MHC I levels. The findings were based on transcriptomic analyses and functional studies in mouse models and human samples. The team also observed similar effects in models of graft-versus-host disease, a complication of bone marrow transplantation. Analysis of clinical datasets from patients who received checkpoint inhibitor therapies showed correlations between this immune mechanism and patient outcomes. The researchers suggest the work could lead to new strategies for cancer treatment and transplantation immunology.
What’s reported
The study was published in Nature Immunology and led by Dr. Pavan Reddy (Baylor College of Medicine) and Dr. Arul Chinnaiyan (University of Michigan).
Cancer cells often reduce or eliminate MHC I to avoid detection by CD8+ T cells.
When MHC I levels were reduced, cancer cells became more susceptible to attacks from CD4+ T cells.
CD4+ T cells triggered ferroptosis, a form of cell death driven by iron-dependent oxidative stress.
Similar effects were observed in models of graft-versus-host disease.
Analysis of patient datasets showed correlations between the immune mechanism and outcomes after checkpoint inhibitor therapy.
The research was supported by NIH grants and Cancer Prevention and Research Institute of Texas grants.
Key figures
Dr. Pavan Reddy, director of the Dan L Duncan Comprehensive Cancer Center at Baylor College of Medicine
Dr. Arul Chinnaiyan, S P Hicks Endowed Professor of Pathology at the University of Michigan Rogel Cancer Center
Dr. Marcin Cieslik, assistant professor of pathology at the University of Michigan Rogel Cancer Center
Emma Lauder, graduate student at Baylor College of Medicine
Meng-Chih Wu, graduate student at Baylor College of Medicine
Mahnoor Gondal, graduate student at the University of Michigan
Akira Yamamoto, Laure Maneix, Dongchang Zhao, Yaping Sun (additional contributors)
Sources: ScienceDaily
