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Researchers have identified the cellular origins of lung squamous cell carcinoma (LUSC), the second most common lung cancer subtype strongly linked to smoking, in a landmark study published in Science. The findings reveal how specific damaged cells in the trachea become dominant, colonize the lungs, and eventually form tumors-a discovery that could revolutionize early detection and prevention strategies.
Led by teams at UCL, the Wellcome Sanger Institute, and the University of Cambridge, the study tracked basal cells expressing the gene Krt5 in mice and humans. These cells, normally responsible for maintaining airway structure, were found to multiply aggressively and invade lung tissue when exposed to carcinogens like tobacco smoke. Using genetic labeling and single-cell RNA sequencing, researchers observed how these cells outcompete healthy ones, forming precancerous lesions that evolve into LUSC.
Key Findings:
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Dominant Cell Population: Damaged Krt5-expressing basal cells in the trachea expand dramatically, displacing luminal cells (which perform protective functions) and colonizing large lung areas.
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Genetic Clues: A transitional cell population marked by the Krt13 gene emerges as these damaged cells spread, offering a potential biomarker for early intervention.
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Human Evidence: DNA analysis of smokers’ trachea and lung samples confirmed that precancerous lesions often originate from a single damaged basal cell, even across both lungs.
Professor Sam Janes (UCL), senior author, emphasized the implications: “By pinpointing the ‘cell of origin’ and its behavior, we can now explore ways to intercept cancer development before it becomes life-threatening.”
Future Applications
The study’s insights could lead to:
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Early Detection Tests: Identifying precancerous cellular changes before tumors form.
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Preventive Therapies: Drugs targeting the mechanisms that allow damaged cells to dominate lung tissue.
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Personalized Screening: Monitoring high-risk individuals, such as long-term smokers, for early signs of cell dominance.
Dr. Talisia Quallo (Cancer Research UK) called the findings “a critical step forward,” noting that lung cancer accounts for 20% of UK cancer deaths, often diagnosed too late for effective treatment.
Hope for High-Risk Patients
Professor Peter Campbell (University of Cambridge) highlighted the role of specific lung environments in cancer development: “If we can detect these high-risk zones early, we might prevent tumors altogether.”
Disclaimer: This article summarizes findings from a peer-reviewed study published in Science (DOI: 10.1126/science.ads9145) and sourced from Medical Xpress. It is not a substitute for professional medical advice. Consult a healthcare provider for personalized guidance.
Read the original study here: Science
Original reporting: Medical Xpress
