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SCML2 contributes to tumor cell resistance to DNA damage through regulating p53 and CHK1 stability

Qianqian Peng1,2, Xin Shi1,2, Dingwei Li1,2

  • 1Department of Radiation and Medical Oncology, Medical Research Institute, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan, 430071, PR China.

Cell Death and Differentiation
|June 23, 2023
PubMed

Insights

SCML2 stabilizes after DNA damage, enhancing chemotherapy resistance. It works differently in p53-positive versus p53-negative cancers by affecting p53, CHK1, and p21 stability.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cellular Signaling

Background:

  • SCML2 (SPOOLY2) is highly expressed in various tumors.
  • Its precise role in tumorigenesis and cancer therapy remains unclear.
  • Understanding SCML2's function in DNA damage response (DDR) is crucial.

Purpose of the Study:

  • To investigate the relationship between SCML2 and the DNA damage response (DDR).
  • To elucidate the mechanisms by which SCML2 influences chemoresistance in different p53 contexts.
  • To identify SCML2 as a potential therapeutic target for overcoming chemotherapy resistance.

Main Methods:

  • Investigated SCML2 stabilization via CHK1-mediated phosphorylation at Ser570.
  • Analyzed SCML2 interaction with USP7, focusing on the critical Ser441 residue.
  • Examined SCML2's distinct roles in p53-positive and p53-negative/mutant cancer cells regarding p53, CHK1, and p21 stability.

Main Results:

  • DNA damage stabilizes SCML2, enhancing resistance to genotoxic agents.
  • SCML2 promotes chemoresistance through p53 competition (p53-positive) or CHK1/p21 stabilization (p53-negative/mutant).
  • SCML2A stabilizes CHK1, while SCML2B stabilizes p21, revealing isoform-specific functions.

Conclusions:

  • SCML2 is a novel regulator of chemotherapy resistance.
  • A positive feedback loop between SCML2 and CHK1 promotes chemoresistance post-DNA damage.
  • Targeting SCML2 may offer new strategies to enhance cancer therapy efficacy.

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