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Updated: Jul 12, 2025
Live Cell Imaging of the TGF- β/Smad3 Signaling Pathway In Vitro and In Vivo Using an Adenovirus Reporter System
Published on: July 30, 2018
Monitoring TGFβ signaling in irradiated tumors
Lin Ma1, Alba Gonzalez-Junca1, William Chou1
1Department of Radiation Oncology and Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, United States.
Abstract:
Transforming growth factor β (TGFβ) is exquisitely regulated under physiological conditions but its activity is highly dysregulated in cancer. All cells make TGFβ and have receptors for the ligand, which is sequestered in the extracellular matrix in a latent form. Ionizing radiation elicits rapid release of TGFβ from these stores, so-called activation, over a wide range of doses and exposures, including low dose (<1Gy) whole-body irradiation, creating an extraordinarily potent signal in the irradiated tissue or tumor. Hence, accurate evaluation of TGFβ activity is complicated because of its ubiquitous distribution as a latent complex. Here we describe conditions for assays that reveal TGFβ activity in situ using either tissue preparations or functional imaging.
Insights
Transforming growth factor β (TGFβ) is dysregulated in cancer. New assays detect TGFβ activity in situ, aiding cancer research and treatment by overcoming challenges of its latent form.
Area of Science:
- Oncology
- Cell Biology
- Biochemistry
Background:
- Transforming growth factor β (TGFβ) signaling is tightly regulated in normal physiology but frequently dysregulated in cancer.
- TGFβ is stored in the extracellular matrix as a latent complex, complicating activity assessment.
- Ionizing radiation can rapidly activate latent TGFβ, creating potent signals in irradiated tissues.
Purpose of the Study:
- To develop and describe conditions for assays that accurately measure TGFβ activity in situ.
- To overcome the challenge of assessing TGFβ activity due to its ubiquitous latent form.
Main Methods:
- Development of in situ assays for TGFβ activity detection.
- Utilizing tissue preparations for TGFβ activity analysis.
- Employing functional imaging techniques to visualize TGFβ activity.
Main Results:
- Established assay conditions that reveal TGFβ activity in situ.
- Demonstrated the feasibility of using tissue preparations and functional imaging for TGFβ activity evaluation.
- Provided a method to accurately assess TGFβ activity despite its latent complex form.
Conclusions:
- The developed assays enable accurate measurement of TGFβ activity in situ.
- These methods facilitate a better understanding of TGFβ's role in cancer and response to radiation.
- Improved TGFβ activity assessment can inform cancer therapy strategies.
