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Updated: May 15, 2026

Measuring DNA Damage and Repair in Mouse Splenocytes After Chronic In Vivo Exposure to Very Low Doses of Beta- and Gamma-Radiation
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Measuring DNA Damage and Repair in Mouse Splenocytes After Chronic In Vivo Exposure to Very Low Doses of Beta- and Gamma-Radiation

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TGF-β signaling plays an important role in resisting γ-irradiation

You Sun An1, Mi-Ra Kim, Seung-Sook Lee

  • 1Division of Radiation Effects, Korea Institute of Radiation and Medical Sciences, Seoul, Korea.

Experimental Cell Research
|December 25, 2012
PubMed

Insights

Transforming growth factor-β1 (TGF-β1) protects cells from gamma irradiation by reducing DNA damage and apoptosis. This signaling pathway enhances cell survival, clarifying its role in cellular response to radiation.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Radiation Biology

Background:

  • Transforming growth factor-β1 (TGF-β1) is a key regulator of cellular processes like differentiation, bone remodeling, and angiogenesis.
  • TGF-β1's role in apoptosis is contradictory, with some studies showing induction and others inhibition, highlighting the need for context-specific investigation.
  • Understanding TGF-β1's influence on cell survival and death is crucial for its role in homeostasis and growth.

Purpose of the Study:

  • To investigate the role of TGF-β1 signaling in the cellular response to gamma irradiation.
  • To resolve discrepancies regarding TGF-β1's effect on apoptosis in the context of radiation exposure.
  • To elucidate the mechanisms by which TGF-β1 influences DNA damage and cell survival post-irradiation.

Main Methods:

  • Utilized mink lung epithelial cell lines (Mv1Lu) and their TGF-β receptor-deficient derivatives (R1B, DR26).
  • Assessed the impact of gamma irradiation on DNA fragmentation, Caspase-3 cleavage, and γ-H2AX foci formation.
  • Investigated the requirement of de novo protein synthesis for TGF-β1's radio-protective effects.

Main Results:

  • Canonical TGF-β1 signaling was found to be important in protecting cells against gamma irradiation.
  • Restoration of TGF-β receptors or introduction of active Smads reduced DNA damage markers (fragmentation, γ-H2AX) and apoptosis (Caspase-3 cleavage) in irradiated cells.
  • De novo protein synthesis was essential for TGF-β1 to confer radio-resistance.

Conclusions:

  • TGF-β1 actively protects cells from gamma irradiation by mitigating DNA damage and suppressing apoptosis.
  • The study clarifies TGF-β1's pro-survival role in response to radiation, enhancing overall cell survival.
  • These findings emphasize the importance of TGF-β1 signaling in cellular radio-resistance and DNA repair mechanisms.

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