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The effects of 1,25-dihydroxyvitamin D3 on human T lymphocyte activation and proliferation: a cell cycle analysis.

W F Rigby, R J Noelle, K Krause and M W Fanger
J Immunol October 1, 1985, 135 (4) 2279-2286;
W F Rigby
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R J Noelle
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K Krause
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M W Fanger
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Abstract

Recent studies have demonstrated that 1,25-dihydroxyvitamin D3 (calcitriol), the most biologically active metabolite of vitamin D, is a potent inhibitor of both lectin- and antigen-driven human T lymphocyte proliferation. To better characterize this effect, we performed cell cycle analysis of both untreated and calcitriol-treated peripheral blood mononuclear cells after PHA stimulation. By using the metachromatic dye acridine orange and flow cytometry, we found that calcitriol blocks the transition from the early, low RNA compartment of G1 (G1A) to the late, higher RNA compartment of G1 (G1B). Consistent with this observation was the inability of exogenous IL 1 or phorbol myristic acetate to overcome calcitriol's suppression of DNA synthesis. Indomethacin slightly reversed calcitriol's inhibition of transition from early to late G1, suggesting a minor, prostaglandin-dependent component to calcitriol's antiproliferative activity. Finally, by using the monoclonal antibodies anti-Tac and OKT9, we found that calcitriol had no effect on IL 2 receptor expression, an early G1 event, but markedly inhibited transferrin receptor expression, an IL 2-dependent, late G1 event. Thus, analysis of calcitriol's effects on the expression of these T cell activation antigens provides further evidence of the cell cycle specificity of calcitriol's action in regulating human T lymphocyte proliferation.

  • Copyright © 1985 by American Association of Immunologists

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The Journal of Immunology
Vol. 135, Issue 4
1 Oct 1985
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The effects of 1,25-dihydroxyvitamin D3 on human T lymphocyte activation and proliferation: a cell cycle analysis.
W F Rigby, R J Noelle, K Krause, M W Fanger
The Journal of Immunology October 1, 1985, 135 (4) 2279-2286;

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The effects of 1,25-dihydroxyvitamin D3 on human T lymphocyte activation and proliferation: a cell cycle analysis.
W F Rigby, R J Noelle, K Krause, M W Fanger
The Journal of Immunology October 1, 1985, 135 (4) 2279-2286;
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Print ISSN 0022-1767        Online ISSN 1550-6606