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. 1991 Dec;74(4):589–593.

1,25(OH)2D3 regulates c-myc mRNA levels in tonsillar T lymphocytes.

R Karmali 1, M Hewison 1, N Rayment 1, S M Farrow 1, A Brennan 1, D R Katz 1, J L O'Riordan 1
PMCID: PMC1384765  PMID: 1783418

Abstract

The effects of 1,25(OH)2D3 on proliferation, c-myc mRNA levels and 1,25(OH)2D3 receptor expression in activated tonsillar T lymphocytes were studied. Activation of resting T cells with phytohaemagglutinin (PHA) for 72 hr led to an increase in proliferation, c-myc mRNA levels and to induction of 1,25(OH)2D3 receptor expression. However, when activation was carried out in the presence of 1,25(OH)2D3, there was inhibition of PHA-stimulated proliferation and c-myc mRNA levels. Increased cell proliferation, c-myc mRNA expression and 1,25(OH)2D3 receptor number were also observed, albeit to a lesser extent, when T cells were stimulated by phorbol myristate acetate (PMA), anti-CD3 antibody or A23187. However, in these cases 1,25(OH)2D3 was unable to prevent increased proliferation or c-myc mRNA expression. PMA and anti-CD3 used in combination produced similar or greater changes in proliferation, c-myc mRNA levels, 1,25(OH)2D3 receptor expression and responsiveness to the hormone when compared to PHA alone. Thus the inhibition of c-myc expression in activated T lymphocytes by 1,25(OH)2D3 can be related to its anti-proliferative effects. Moreover this inhibition seems to be dependent on the level of 1,25(OH)2D3 receptor expression, which in turn appears to be related to the degree of cell activation.

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Selected References

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