Animal cells and systems

  • 제7권1호
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  • Pages.57-62
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  • 2003
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  • 1976-8354(pISSN)
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  • 2151-2485(eISSN)
한국통합생물학회 (The Korean Society for Integrative Biology)
권호 표지

The Effect of Cortisol on Proliferative Properties of Flounder (Paralychthys Olivaceus) B Lymphocytes

  • Choi, Sang-Hoon (Department of Marine Biomedical Science, Kunsan University) ;
  • Oh, Chan-Ho (Division of Biotechnology ＆ Environmental Engineering, Woo-Suk University)
  • 발행 : 2003.03.01
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초록

Flounder B lymphocytes isolated from different tissues were studied in terms of cell proliferation, apoptosis and the effects of cortisol on these processes. B lymphocytes, isolated from the flounder head kidney and spleen, were characterized by higher proliferation and lower intracellular calcium ($Ca^2$) response to lgcrosslinking compared with peripheral blood B lymphocytes. Cortisol induced high levels of apoptosis (150% of control levels) in peripheral blood B lymphocytes, in combination with a stimulatory LPS signal. Head kidney and to a lesser extent spleen B lymphocytes, although less sensitive than their equivalent in peripheral blood, underwent cortisol-induced apoptosis irrespective of extra stimulation up to 142% of control levels. Also proliferation with and without LPS stimulation was suppressed by cortisol (compared to plasma values measured during stress conditions) that is effective in inducing a significant increase in apoptosis in all three populations of B-cells, suggesting that cortisol may be important for immunoregulation in both stressed and non-stressed conditions. This implies possible severe impact of stress on lymphocyte development and activity, Different sensitivity of B-cells to the corticosteroid, with respect to developmental stage and activity, may prevent excessive and long lasting depletion of B-lymphocytes.

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