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Down-regulation of Immune-related Genes by PSCA in Gallbladder Cancer Cells Implanted into Mice
Norihisa Saeki1, Hiroe Ono2, Hiromi Sakamoto2
1Division of Genetics, National Cancer Center Research Institute, Chuo-ku, Tokyo, Japan nsaeki@ncc.go.jp.
Background/Aim:
In previous work, we found that prostate stem cell antigen (PSCA) gene, encoding a glycosylphosphatidylinositol-anchored protein, is a presumable tumor suppressor in gastric cancer and gallbladder cancer (GBC). The introduction of PSCA cDNA into GBC cell lines significantly suppressed tumorigenecity of cells in mice. The PSCA protein is thought to be involved in some form of intracellular signaling that remains to be elucidated.
Materials And Methods:
Using microarrays, we conducted gene-expression profiling on tumors generated by a GBC cell line TGBC-1TKB, with and without expression of PSCA, which was implanted into mice. Genes whose expression was down-regulated by PSCA were selected, and their down-regulation was confirmed by real-time PCR.
Results:
We identified several immune-related genes down-regulated by PSCA, including interleukin 8 (IL8), IL1 receptor antagonist (IL1RN) and S100 calcium-binding proteins A8 (S100A8) and A9 (S100A9).
Conclusion:
PSCA signaling may suppress tumor growth in vivo by modulating immunological characteristics of GBC cells.
Insights
Prostate stem cell antigen (PSCA) may suppress gallbladder cancer (GBC) growth by down-regulating immune-related genes. This study identified key genes like IL8 and S100A8/A9 affected by PSCA signaling in GBC tumors.
Area of Science:
- Oncology
- Molecular Biology
- Immunology
Background:
- Prostate stem cell antigen (PSCA) is a potential tumor suppressor in gastric and gallbladder cancer (GBC).
- PSCA expression in GBC cell lines suppressed tumor growth in vivo.
- The intracellular signaling pathways of PSCA remain largely unknown.
Purpose of the Study:
- To investigate the molecular mechanisms by which PSCA suppresses GBC tumor growth.
- To identify genes regulated by PSCA in GBC.
- To elucidate the role of PSCA in modulating the tumor microenvironment.
Main Methods:
- Gene-expression profiling using microarrays on GBC tumors with and without PSCA expression.
- Tumor generation via implantation of GBC cell lines (TGBC-1TKB) into mice.
- Validation of gene expression changes using real-time PCR.
Main Results:
- PSCA expression led to the down-regulation of several immune-related genes.
- Identified genes include interleukin 8 (IL8), IL1 receptor antagonist (IL1RN), and S100 calcium-binding proteins A8 (S100A8) and A9 (S100A9).
- These findings suggest PSCA influences the immunological characteristics of GBC cells.
Conclusions:
- PSCA signaling contributes to tumor suppression in GBC.
- Modulation of immune-related gene expression is a key mechanism of PSCA's tumor-suppressive function.
- PSCA may impact GBC tumor growth by altering the tumor's immunological profile in vivo.
