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The calcium pump PMCA4b promotes epithelial cell polarization and lumen formation

Sarolta Tóth1, Diána Kaszás2,3,4, János Sónyák2

  • 1Department of Transfusion Medicine, Semmelweis University, Budapest, Hungary. sarolta.toth7@gmail.com.

Communications Biology
|March 13, 2025
PubMed

Insights

Plasma membrane Ca2+ pump PMCA4 is reduced in breast cancer, impacting cell polarity and tissue structure. Restoring PMCA4 promotes cell polarization and lumen formation, crucial for glandular tissue architecture.

Area of Science:

  • Cell Biology
  • Cancer Research
  • Molecular Biology

Background:

  • Loss of epithelial cell polarity and tissue disorganization are key features of cancer.
  • Calcium (Ca2+) signaling is implicated in carcinogenesis.
  • The plasma membrane Ca2+ pump PMCA4 (ATP2B4) role in breast cancer is not well understood.

Purpose of the Study:

  • To investigate the role of PMCA4 in breast cancer.
  • To determine the association between PMCA4 expression and patient survival.
  • To elucidate the mechanism by which PMCA4 influences epithelial cell polarity and lumen formation.

Main Methods:

  • Analysis of PMCA4 expression in human breast cancer tissues.
  • Correlation of PMCA4 levels with relapse-free survival in breast cancer subtypes.
  • Experimental manipulation of PMCA4 expression in MCF-7 breast cancer cells.
  • Investigation of PMCA4's role in lumen formation using cell culture models.
  • Identification of regulatory proteins involved in PMCA4 function.
  • Functional studies in Drosophila melanogaster larval salivary glands.

Main Results:

  • PMCA4 is downregulated in luminal breast cancer.
  • Lower PMCA4 expression correlates with shorter relapse-free survival in luminal A and B1 subtypes.
  • PMCA4 silencing in MCF-7 cells leads to loss of cell polarity.
  • Increased PMCA4b expression induces cell polarization and lumen formation.
  • Arf6 regulates PMCA4b endocytic recycling, essential for PMCA4-mediated lumen formation.
  • PMCA gene silencing in Drosophila disrupts lumen morphology, indicating a conserved role.

Conclusions:

  • PMCA4 plays a critical role in maintaining epithelial cell polarity.
  • PMCA4 is essential for normal glandular tissue architecture and lumen morphogenesis.
  • Downregulation of PMCA4 in breast cancer may contribute to tumorigenesis.
  • PMCA4 represents a potential therapeutic target for breast cancer treatment.

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