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Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols
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A novel ER-microtubule-binding protein, ERLIN2, stabilizes Cyclin B1 and regulates cell cycle progression

Xuebao Zhang1, Juan Cai1, Ze Zheng1

  • 1Center for Molecular Medicine and Genetics, Wayne State University School of Medicine , Detroit, MI, USA.

Cell Discovery
|July 28, 2016
PubMed

Insights

Endoplasmic reticulum protein 2 (ERLIN2) binds microtubules and stabilizes cell cycle factors, impacting breast cancer malignancy. Its downregulation halts cancer cell proliferation and drug resistance.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • The gene for endoplasmic reticulum (ER) lipid raft-associated protein 2 (ERLIN2) is amplified in human breast cancers.
  • ERLIN2 mutations are linked to childhood progressive motor neuron diseases, but its function is unclear.

Purpose of the Study:

  • To elucidate the physiological function and mechanism of ERLIN2.
  • To investigate ERLIN2's role in cell cycle regulation and breast cancer.

Main Methods:

  • Investigated ERLIN2's interaction with ER and microtubules.
  • Analyzed ERLIN2's role in cell cycle progression, specifically G2/M phase.
  • Examined ERLIN2's interaction with Cyclin B1/Cdk1 complex.
  • Assessed the impact of ERLIN2 downregulation on breast cancer cells.

Main Results:

  • ERLIN2 is a spatially and temporally regulated ER-microtubule-binding protein.
  • ERLIN2 interacts with α-tubulin and stabilizes mitosis-promoting factors like Cyclin B1/Cdk1 during G2/M phase.
  • ERLIN2 facilitates K63-linked ubiquitination and stabilization of Cyclin B1.
  • ERLIN2 is highly expressed in aggressive breast cancers but downregulated in adult development.
  • ERLIN2 downregulation causes cell cycle arrest, reduces breast cancer proliferation and malignancy, and enhances drug sensitivity.

Conclusions:

  • ERLIN2 is a novel ER-microtubule-binding protein crucial for cell cycle progression.
  • ERLIN2 stabilizes mitosis-promoting factors, regulating cell cycle and impacting breast cancer malignancy.
  • Targeting ERLIN2 may offer therapeutic strategies for breast cancer.
Keywords:
Cyclin B1ER lipid raft proteinbreast cancerendoplasmic reticulummicrotubulemitosis

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