Effect of 1,25-dihydroxyvitamin D3 on cytokine-induced thymocyte proliferation

Tamio Koizumi, Yoshinobu Nakao, Toshimitsu Matsui, Toshitaro Nakagawa, Yuko Katakami, Takuo Fujita

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18 Scopus citations


To clarify the mechanism of the inhibitory effect of 1,25(OH)2D3 on lymphocyte proliferation, the effect of 1,25(OH)2D3 on murine thymocyte proliferation induced by interleukin 1 (IL-1), or 2 (IL-2) was examined. Physiological concentrations of 1,25(OH)2D3 inhibited thymocyte proliferation induced by IL-1 and IL-2 in similar fashion suggesting an inhibition of the response to IL-2 by this hormone. In addition, cortisone-resistant thymocytes (including a majority of medullary thymocytes), which proliferate more vigorously in response to IL-1 than do untreated thymocytes, were more sensitive to 1,25(OH)2D3 inhibition. Therefore, the inhibition of IL-2 production of the mature medullary thymocyte by this hormone was also suggested.

Original languageEnglish
Pages (from-to)455-461
Number of pages7
JournalCellular Immunology
Issue number2
StatePublished - Dec 1985
Externally publishedYes


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