Abstract
We have previously reported that functionally active μ-opioid receptors (MOR) are constitutively expressed at relatively low levels by developing T cells in the thymus. However, very little is known about the regulation of MOR expression by immature T cells. In this report, we first attempted to determine the effect of T cell receptor-induced T cell activation on the expression of MOR. We activated T cells with either the combination of anti-CD3 and CD28, or with superantigen, and observed a substantial increase in MOR transcript expression. We also chose to examine the effect of cytokine-mediated T cell activation on the expression of this opioid receptor. We selected certain cytokines that play a role in T cell development and are known to be present at functional levels in the thymus gland. Our results show that interferon γ (IFNγ), IL-1β, and IL-2, and in particular transforming growth factor-β (TGFβ), all induced significant increases in MOR transcript expression. On the other hand, both TNFα and IL-7 exhibited much weaker effects on MOR expression. These results show that MOR expression by developing T cells is strongly regulated by several cytokines involved in T cell development in the thymus gland.
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The authors have no known conflicts of interest concerning the results reported in this manuscript.
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The authors wish to acknowledge the support from the National Institutes of Health for the following grant support: DA14230 (TJR), DA16544 (TJR), P30DA13429 (TJR), DA06650 (TJR).
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Zhang, L., Belkowski, J.S., Briscoe, T. et al. Regulation of Mu Opioid Receptor Expression in Developing T Cells. J Neuroimmune Pharmacol 7, 835–842 (2012). https://doi.org/10.1007/s11481-012-9396-6
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DOI: https://doi.org/10.1007/s11481-012-9396-6