Mark W. Dewhirst
马克·德怀斯特
DVM, PhD
Gustavo S. Montana Distinguished Professor Emeritus of Radiation Oncology放射肿瘤学古斯塔沃·S·蒙大拿杰出荣誉教授
👥Biography 个人简介
Mark Dewhirst is one of the world's foremost experts on tumor hypoxia, radiation-induced normal tissue injury, and the role of TGF-beta signaling in radiation-induced fibrosis. His laboratory provided seminal mechanistic insights into how ionizing radiation activates TGF-beta, which drives fibroblast differentiation to myofibroblasts and progressive fibrotic tissue remodeling. He has also led the field in understanding how hypoxia in the tumor microenvironment modulates radiation response and has pioneered hyperthermia as a radiosensitizing strategy.
🧪Research Fields 研究领域
🎓Key Contributions 主要贡献
TGF-beta Mechanism in Radiation Fibrosis
Demonstrated that radiation exposure activates latent TGF-beta through reactive oxygen species-mediated mechanisms, initiating a TGF-beta/Smad signaling cascade that drives myofibroblast differentiation and progressive extracellular matrix deposition—the molecular basis of radiation-induced fibrosis.
Tumor Hypoxia Dynamics and Radiation Response
Developed intravital imaging techniques to measure real-time oxygen levels in tumors during radiation, demonstrating acute and chronic hypoxia cycles that profoundly modulate radiosensitivity and revealing the importance of reoxygenation timing in fractionated radiation.
Hyperthermia as Radiosensitizer
Conducted pivotal clinical trials demonstrating that hyperthermia (40-43°C) dramatically enhances radiation response in hypoxic tumor regions by inhibiting DNA repair and increasing tumor blood flow, supporting combined hyperthermia-radiation treatment for locally advanced cancers.
Representative Works 代表性著作
Radiation-induced TGF-beta activation: mechanisms and clinical relevance
Radiation Research (2006)
Comprehensive mechanistic review of TGF-beta activation by radiation and its role in normal tissue fibrosis, widely cited as foundational reference in radiation fibrosis biology.
Cycling hypoxia and free radicals regulate angiogenesis and radiotherapy response in tumors
Cancer Research (2008)
Landmark study using real-time oxygen measurements to demonstrate cycling hypoxia and its modulation of angiogenesis and radiation sensitivity.
Vascular-targeting approaches for radiation sensitization
International Journal of Radiation Oncology Biology Physics (2012)
Review of strategies combining radiation with vascular-targeting agents to overcome hypoxic radioresistance.
🏆Awards & Recognition 奖项与荣誉
📄Data Sources 数据来源
Last updated: 2026-01-15 | All information from publicly available academic sources
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