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Up-regulation of GIPC2 in human gastric cancer
Hiroyuki Kirikoshi1, Masaru Katoh
1Genetics and Cell Biology Section, Genetics Division, National Cancer Center Research Institute, Tsukiji 5-chome, Chuo-ku, Tokyo 104-0045, Japan.
Abstract:
GIPC1/GIPC, GIPC2, and GIPC3 are a family of central PDZ-domain proteins. GIPC1/GIPC interacts with TGFbeta type III receptor, receptor tyrosine kinase TrkA, integrin alpha6A subunit, and GTPase-activating protein RGS-GAIP, while Xenopus homologue of human GIPCs interacts with Frizzled-3 (FZD3) class of WNT receptor. Here, we investigated expression of GIPC2 mRNA in human gastric, pancreatic, and breast cancer cell lines. GIPC2 mRNA was relatively highly expressed in OKAJIMA, TMK1, MKN45, and KATO-III cells derived from diffuse type of gastric cancer, but was almost undetectable in MKN7, MKN28, and MKN74 cells derived from intestinal type of gastric cancer as well as in other cell lines derived from pancreatic and breast cancer. Tumor necrosis factor alpha and interferon gamma, which are elevated in gastric mucosa with Helicobacter pylori infection, did not affect the expression level of GIPC2 mRNA in MKN45 cells. Up-regulation of GIPC2 mRNA was detected in 7 out of 10 cases of primary gastric cancer by using cDNA-PCR, and in 4 out of another 8 cases of primary gastric cancer by using expression array filter hybridization. GIPC2 might play important roles in human gastric cancer through modulation of growth factor signaling or cell adhesion.
Insights
GIPC2 mRNA is highly expressed in diffuse-type gastric cancer cells and primary tumors. This suggests GIPC2 may play a role in gastric cancer development and progression.
Area of Science:
- Molecular Biology
- Oncology
- Genetics
Background:
- GIPC1/GIPC, GIPC2, and GIPC3 are central PDZ-domain proteins involved in various cellular interactions.
- GIPC1 interacts with growth factor receptors and signaling molecules.
- The role of GIPC2 in human cancers, particularly gastric cancer, is not well understood.
Purpose of the Study:
- To investigate the expression of GIPC2 mRNA in human gastric, pancreatic, and breast cancer cell lines.
- To determine if GIPC2 expression correlates with specific types of gastric cancer.
- To explore the potential role of GIPC2 in gastric cancer pathogenesis.
Main Methods:
- Analysis of GIPC2 mRNA expression in various cancer cell lines using techniques like cDNA-PCR.
- Comparison of GIPC2 expression levels between different gastric cancer subtypes (diffuse vs. intestinal).
- Evaluation of GIPC2 mRNA expression in primary gastric cancer tissues using cDNA-PCR and expression array filter hybridization.
Main Results:
- GIPC2 mRNA was highly expressed in diffuse-type gastric cancer cell lines (e.g., OKAJIMA, TMK1, MKN45, KATO-III).
- GIPC2 mRNA was nearly undetectable in intestinal-type gastric cancer cell lines and in pancreatic and breast cancer cell lines.
- Up-regulation of GIPC2 mRNA was observed in a significant proportion of primary gastric cancer cases (7/10 and 4/8 in two separate cohorts).
- Expression of GIPC2 mRNA was not affected by tumor necrosis factor alpha or interferon gamma in MKN45 cells.
Conclusions:
- GIPC2 mRNA is significantly up-regulated in diffuse-type gastric cancer.
- GIPC2 may play a crucial role in the development or progression of human gastric cancer.
- Further research is warranted to elucidate the specific mechanisms by which GIPC2 influences gastric cancer, potentially through growth factor signaling or cell adhesion pathways.