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Published on: October 27, 2020
The Role of TGFβ Signaling in Squamous Cell Cancer: Lessons from Mouse Models
1Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802, USA.
Abstract:
TGFβ1 is a member of a large growth factor family including activins/inhibins and bone morphogenic proteins (BMPs) that have a potent growth regulatory and immunomodulatory functions in normal skin homeostasis, regulation of epidermal stem cells, extracellular matrix production, angiogenesis, and inflammation. TGFβ signaling is tightly regulated in normal tissues and becomes deregulated during cancer development in cutaneous SCC and many other solid tumors. Because of these diverse biological processes regulated by TGFβ1, this cytokine and its signaling pathway appear to function at multiple points during carcinogenesis with distinct effects. The mouse skin carcinogenesis model has been a useful tool to dissect the function of this pathway in cancer pathogenesis, with transgenic and null mice as well as small molecule inhibitors to alter the function of the TGFβ1 pathway and assess the effects on cancer development. This paper will review data on changes in TGFβ1 signaling in human SCC primarily HNSCC and cutaneous SCC and different mouse models that have been generated to investigate the relevance of these changes to cancer. A better understanding of the mechanisms underlying the duality of TGFβ1 action in carcinogenesis will inform potential use of this signaling pathway for targeted therapies.
Insights
Transforming growth factor beta 1 (TGFβ1) signaling is crucial for skin health but becomes dysregulated in skin cancer. Understanding its dual role in carcinogenesis is key for developing targeted therapies.
Area of Science:
- Oncology
- Dermatology
- Molecular Biology
Background:
- Transforming growth factor beta 1 (TGFβ1) is a cytokine with critical roles in skin homeostasis, including epidermal stem cell regulation, extracellular matrix production, and inflammation.
- TGFβ1 signaling is tightly controlled in healthy tissues but frequently dysregulated during the development of cutaneous squamous cell carcinoma (SCC) and other cancers.
Purpose of the Study:
- To review the alterations in TGFβ1 signaling observed in human SCC, particularly head and neck SCC (HNSCC) and cutaneous SCC.
- To examine the utility of mouse models in dissecting the role of TGFβ1 signaling in skin cancer pathogenesis.
- To elucidate the dual functions of TGFβ1 in carcinogenesis to inform potential targeted therapeutic strategies.
Main Methods:
- Review of existing literature on TGFβ1 signaling in human SCC (HNSCC and cutaneous SCC).
- Analysis of data from various mouse models of skin carcinogenesis, including transgenic and null mice.
- Investigation of the effects of small molecule inhibitors targeting the TGFβ1 pathway on cancer development.
Main Results:
- TGFβ1 signaling is deregulated in human SCC, indicating its involvement in cancer development.
- Mouse models provide valuable insights into the complex, context-dependent roles of TGFβ1 in skin carcinogenesis.
- The dual nature of TGFβ1 action (both tumor-promoting and tumor-suppressive) is evident across different stages of cancer development.
Conclusions:
- Dysregulated TGFβ1 signaling is a hallmark of SCC, highlighting its significance in cancer pathogenesis.
- Understanding the multifaceted roles of TGFβ1 in carcinogenesis is essential for its effective therapeutic targeting.
- Further research into the mechanisms of TGFβ1 action could lead to novel treatment strategies for SCC.
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TGF - β Signaling Pathway

