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Published on: October 31, 2007
Somatostatin has an antiproliferative effect on concanavalin A-activated rat thymocytes
Abstract:
Somatostatin, a cyclic tetradecapeptide which is widely distributed in different tissues of the body, exerts an inhibitory effect on numerous cellular processes. It has been observed recently that somatostatin and its analogs were antimitogenic in several established cultured cell lines and in rat tumors. To determine whether this ubiquitous peptide had an antiproliferative effect on a primary culture of rat thymocytes, we observed its effect on the separation of the centrosome (a cell maker of the G1 to S traverse) and DNA synthesis of rat thymocytes activated by concanavalin A. Somatostatin inhibited both indices of proliferation in rat thymocytes at a concentration of 10(-8)M. This observation suggests that somatostatin, which has been localized in the thymus, may play a regulatory role in the growth and development of the cells found in the thymus gland, and may affect thymocyte function in disease states characterized by elevated circulating concentrations of somatostatin.
Insights
Somatostatin, a peptide hormone, inhibits cell proliferation in rat thymocytes. This peptide hormone may regulate thymus gland development and thymocyte function in certain diseases.
Area of Science:
- Endocrinology
- Cell Biology
- Immunology
Background:
- Somatostatin is a cyclic tetradecapeptide found widely in tissues.
- Somatostatin and its analogs exhibit antimitogenic properties in cell lines and tumors.
- The thymus gland is a site where somatostatin is localized.
Purpose of the Study:
- To investigate the antiproliferative effect of somatostatin on primary rat thymocytes.
- To determine if somatostatin affects centrosome separation and DNA synthesis in activated thymocytes.
Main Methods:
- Primary rat thymocytes were activated using concanavalin A.
- The effect of somatostatin on centrosome separation (G1 to S phase transition marker) was measured.
- DNA synthesis in rat thymocytes was quantified.
Main Results:
- Somatostatin significantly inhibited both centrosome separation and DNA synthesis in rat thymocytes.
- The inhibitory effect was observed at a somatostatin concentration of 10(-8)M.
Conclusions:
- Somatostatin demonstrates an antiproliferative effect on rat thymocytes.
- The findings suggest a regulatory role for somatostatin in thymus gland growth, development, and thymocyte function.
- Elevated somatostatin levels may impact thymocyte function in specific disease states.
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