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PKCδ Regulates Chromatin Remodeling and DNA Repair through SIRT6.

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Protein kinase C delta (PKCδ) regulates DNA repair and sensitivity to irradiation by controlling chromatin accessibility and histone modification through Sirtuin 6 (SIRT6). Inhibiting PKCδ enhances DNA repair, offering potential radioprotection strategies.

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Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Genetics

Background:

  • Irradiation (IR) is a vital cancer therapy, but damages healthy tissues, causing side effects and limiting treatment.
  • Protein kinase C delta (PKCδ) is crucial for IR-induced apoptosis, and its inhibition offers radioprotection.
  • PKCδ's role in DNA damage response and its relationship with chromatin regulation were not fully understood.

Purpose of the Study:

  • To elucidate the mechanism by which PKCδ influences DNA repair and chromatin accessibility in response to irradiation.
  • To investigate the role of Sirtuin 6 (SIRT6) as a downstream mediator of PKCδ in regulating DNA damage response.
  • To define a novel pathway for PKCδ-mediated regulation of radiation-induced apoptosis and identify potential therapeutic targets.

Main Methods:

  • Investigated the effects of PKCδ overexpression and depletion on DNA damage, apoptosis, and genomic stability.
  • Assessed DNA repair pathways, including nonhomologous end joining (NHEJ) and homologous recombination (HR), using fluorescent reporter constructs and DNA damage foci.
  • Analyzed chromatin accessibility using nuclease sensitivity assays and examined histone modifications and associated proteins via epiproteome analysis.
  • Determined the role of SIRT6 by examining its expression in PKCδ-depleted cells and its impact on chromatin changes and radioprotection.

Main Results:

  • PKCδ overexpression increased DNA damage and apoptosis, while PKCδ depletion enhanced DNA repair (NHEJ and HR) and genomic stability.
  • PKCδ depletion led to more accessible chromatin and altered histone modifications (H3K36me2), associated with KDM2A dissociation.
  • SIRT6 was identified as a downstream mediator; PKCδ depletion increased SIRT6 expression, and SIRT6 depletion reversed the observed effects on chromatin, DNA repair, and radioprotection.
  • PKCδ depletion significantly increased SIRT6 expression, and subsequent SIRT6 depletion reversed the radioprotective effects seen in PKCδ-depleted cells.

Conclusions:

  • PKCδ regulates DNA double-strand break repair and chromatin accessibility through a SIRT6-dependent mechanism.
  • Modulating PKCδ activity impacts chromatin structure and DNA repair pathways, offering a novel strategy for cancer therapy.
  • This study defines a new pathway linking PKCδ, SIRT6, chromatin regulation, and DNA repair, providing insights into radiation response and potential therapeutic interventions.