Neuwirt et al identified SOCS-1 expression in multiple prostate cancer cell lines as well as in tissues from prostate cancer patients. They found that SOCS-1 blocks proliferation of prostate cancer cells and that inhibition of SOCS-1 expression stimulated tumor cell growth.
SOCS-1, therefore, plays a negative regulatory role in prostate cancer proliferation. In future studies they will address "other possible aspects of SOCS-1 action in carcinoma of the prostate, such as regulation of the immune response."
Neuwirt H, Puhr M, Santer FR, Susani M, Doppler W, Marcias G, Rauch V, Brugger M, Hobisch A, Kenner L, Culig Z: Suppressor of cytokine signaling (SOCS)-1 is expressed in human prostate cancer and exerts growth-inhibitory function through down-regulation of cyclins and cyclin-dependent kinases. Am J Pathol 2009, 174: 1921-1930
TIP30 Inhibits Lung Cancer Metastasis
Researchers in Shanghai, China suggest that TIP30 prevents metastatic progression of lung cancer. They report these findings in the May 2009 issue of The American Journal of Pathology.
TIP30 is a putative tumor suppressor with decreased expression in numerous cancers including melanoma, breast cancer, and colon cancer. Lung cancer is the most common cancer worldwide, both in terms of incidence and of mortality.
To determine if TIP30 plays a role in lung cancer progression and metastasis, Tong et al examined TIP30 expression in paired cancerous and non-cancerous lung tissue. TIP30 expression was decreased in a third of non-small cell lung cancers compared with normal controls, and reduced TIP30 expression correlated with lymph node metastasis. In addition, inhibition of TIP30 expression promoted lung cancer metastasis and angiogenesis in mice,
Tong et al conclude that "TIP30 may function as a tumor suppressor gene and play important roles in suppressing the progre
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American Journal of Pathology