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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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pKC modulates integrin expression that contributes to fibrotic changes in irradiated thyroid tissue
Pinal R Pandya1, Virginia Serra1, Lora M Green1
1Department of Basic Sciences, Divisions of Microbiology and Radiation Research Loma Linda University School of Medicine, Loma Linda, CA, U.S.A.
In Vivo (Athens, Greece)
|March 21, 2015
Summary
Radiation exposure alters thyroid cell signaling, increasing protein kinase C (pKC) and extracellular matrix (ECM) components, leading to radiation-induced fibrosis. This study highlights pKC
Area of Science:
- Radiation Biology
- Cell Signaling
- Fibrosis Research
Background:
- Radiation-induced fibrosis is a significant clinical challenge.
- Altered signal transduction pathways are implicated in fibrosis development.
- The role of protein kinase C (pKC) in radiation-induced extracellular matrix (ECM) modulation requires further elucidation.
Purpose of the Study:
- To investigate the role of pKC in radiation-induced alterations of integrin expression and ECM.
- To determine if pKC directly modulates cellular properties associated with fibrosis.
- To assess the impact of proton radiation on thyroid tissue fibrosis in vivo.
Main Methods:
- Exposure of rat FRTL-5 and primary thyroid cells to proton radiation (5 and 10 Gy).
- Analysis of ECM accumulation, tissue organization, pKC isoforms, and integrin expression post-irradiation.
- In vivo study involving proton irradiation of Lewis rats, followed by thyroid tissue evaluation at 11 weeks.
Main Results:
- Proton radiation induced ECM accumulation, loss of tissue organization, and altered follicularization in thyroid cells.
- Increased pKC isoforms correlated with modulated integrin expression and altered ECM components (fibronectin, laminin, collagen) post-irradiation.
- Irradiated rat thyroid tissue exhibited increased fibrotic lesions, pKC isoforms, integrins, and fibronectin compared to controls.
Conclusions:
- Protein kinase C (pKC) is a key mediator in the development of radiation-induced fibrosis.
- pKC activity influences critical signaling molecules and ECM components involved in radiation-induced tissue damage.
- Findings support pKC as a potential therapeutic target for mitigating radiation-induced fibrosis.
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