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Ectopic expression of guanylyl cyclase C in gastric cancer as a potential biomarker and therapeutic target

Zhen Biao Mao1, Jian Feng Zhang, Zhong Xu

  • 1Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong, China. mzb63@163.com

Journal of Digestive Diseases
|November 13, 2009
PubMed
Abstract

Insights

Guanylyl cyclase C (GCC) is overexpressed in intestinal gastric cancer (GC). GCC small interfering RNA (siRNA) effectively inhibits GC cell proliferation and invasion while inducing apoptosis, suggesting GCC as a potential therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Guanylyl cyclase C (GCC) is a transmembrane receptor guanylyl cyclase.
  • Its role in gastric cancer (GC) pathogenesis and progression is not fully understood.

Purpose of the Study:

  • To investigate GCC expression in human GC tissues.
  • To evaluate the impact of GCC small interfering RNA (siRNA) on SGC-7901 cell proliferation and apoptosis.

Main Methods:

  • GCC expression (mRNA and protein) was assessed in GC specimens and cell lines using RT-PCR, Western blot, and immunofluorescence.
  • SGC-7901 cells were transfected with GCC siRNA or scrambled siRNA.
  • Cell proliferation, apoptosis, cell cycle, motility, and adhesion were evaluated using CCK-8, FCM, TUNEL, wound healing, and cell adhesion assays.

Main Results:

  • GCC expression was detected in 20/30 GC specimens but absent in adjacent tissues, with higher prevalence in intestinal GC.
  • GCC siRNA significantly inhibited SGC-7901 cell proliferation, induced apoptosis, and reduced cell motility and adhesion.
  • Morphological changes indicative of apoptosis were observed in treated cells.

Conclusions:

  • GCC is overexpressed in intestinal-type GC, indicating its potential as a biomarker.
  • GCC siRNA demonstrates efficacy in inhibiting GC cell proliferation and invasion and inducing apoptosis.
  • GCC represents a promising novel therapeutic target for gastric cancer.

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