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Updated: Apr 11, 2026

Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols
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Induction of G1 Arrest by SB265610 Involves Cyclin D3 Down-regulation and Suppression of CDK2 (Thr160)

Ahmed E Goda1, Raymond L Erikson2, Jong-Seog Ahn3

  • 1World Class Institute, Incurable Diseases Therapeutics Research Center, Korea Research Institute of Bioscience and Biotechnology, Ochang, Cheongwon, Republic of Korea Department of Pharmacology and Toxicology, Faculty of Pharmacy, Tanta University, Tanta, Egypt.

Anticancer Research
|May 31, 2015
PubMed
Abstract

Insights

SB265610, a CXCR2 antagonist, halts cancer cell growth by impacting cell-cycle regulators like cyclin D3 and CDK2. This mechanism is effective in interleukin 8 (IL8)-rich tumor environments.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • The study focuses on SB265610, a specific antagonist targeting C-X-C chemokine Receptor type 2 (CXCR2).
  • CXCR2 plays a role in tumor microenvironments, particularly those rich in Interleukin 8 (IL8).

Purpose of the Study:

  • To elucidate the molecular mechanisms behind the antitumor effects of SB265610.
  • To understand how SB265610 influences cancer cell-cycle progression.

Main Methods:

  • Flow cytometry, immunoblotting, and real-time PCR were used to assess cell-cycle progression.
  • RNA interference and immunoprecipitation were employed for target validation and protein interaction analysis.

Main Results:

  • SB265610 induced G1 cell-cycle arrest, involving CDK2 hypophosphorylation and cyclin D3 down-regulation.
  • The p38MAPK pathway was sustainedly phosphorylated by SB265610, and its inhibition reversed the G1 arrest.
  • Cyclin D3 expression and its binding to CDK6 were normalized upon p38MAPK inhibition.

Conclusions:

  • SB265610 exhibits anti-proliferative activity through modulation of cell-cycle regulators.
  • The findings suggest SB265610's potential therapeutic value in IL8-rich tumor settings.
Keywords:
G1 arrestSB265610cyclin D3p21p38MAPKphospho(Thr160)-CDK2

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