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The membrane molecule RCAS1 induces immune cell apoptosis via the RCAS1-RCAS1R pathway

Yuanyuan Zhang1, Jie Zhu, Xuejun Hong

  • 1The Children's Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang, People's Republic of China. zhang_y_y@sohu.com

International Journal of Molecular Medicine
|April 9, 2013
PubMed

Insights

Tumor-associated antigen RCAS1 induces immune cell apoptosis via the RCAS1-RCAS1R pathway. This mechanism, involving GSK3β, may explain how cancer cells evade immune surveillance.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cancer Research

Background:

  • Tumor-associated antigen receptor-binding cancer antigen expressed on SiSo cells (RCAS1) is an estrogen-responsive gene.
  • RCAS1 acts as a ligand, inducing apoptosis in various human cell lines and lymphocytes via a putative receptor.
  • Understanding RCAS1's role in immune cell apoptosis is crucial for cancer immune evasion mechanisms.

Purpose of the Study:

  • To investigate the in vitro biological function of RCAS1 in inducing immune cell apoptosis.
  • To detect the expression of the RCAS1 receptor (RCAS1R) and elucidate the mechanisms of RCAS1-induced apoptosis.
  • To explore the correlation between RCAS1 expression and GSK3β signaling in cancer.

Main Methods:

  • HeLa cells were transfected with recombinant adenovirus Ad-RCAS1.
  • RCAS1-induced apoptosis was assessed in activated T cells, K562 cells, and PHA-activated Jurkat cells.
  • Expression of RCAS1R, GSK3β, and phosphorylated GSK3β (phGSK3β) was analyzed. Breast cancer specimens were examined for RCAS1 expression patterns.

Main Results:

  • RCAS1 induced apoptosis in activated T cells, K562 cells, and Jurkat cells through the RCAS1-RCAS1R pathway.
  • RCAS1R expression was induced, and intracellular RCAS1 overexpression inhibited Jurkat and K562 cell growth.
  • RCAS1 expression negatively correlated with GSK3β and positively correlated with phGSK3β. Brown staining for RCAS1 was observed in breast cancer specimens.

Conclusions:

  • RCAS1 induces immune cell apoptosis via the RCAS1-RCAS1R pathway, potentially contributing to tumor immune evasion.
  • The study elucidates the molecular mechanisms of RCAS1-mediated apoptosis and its signaling pathways.
  • RCAS1 expression in breast cancer suggests its role in tumor progression and immune escape strategies.

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