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Cell Immunol. 2005 Jul-Aug;236(1-2):123-30. Epub 2005 Sep 12.

Co-expression of IL-12 receptors along with CXCR3 and CD25 on activated peripheral blood T lymphocytes.

Author information

1
Department of Clinical Pharmacology and Experimental Medicine, Centocor Inc. 145 King of Prussia Road, Radnor, PA 19087-4517, USA. Mreddy@CNTUS.JNJ.com

Abstract

IL-12 receptors (IL-12R) play a critical role in maintaining IL-12 regulation of T helper-1 (Th1) type immune responses. We studied the expression of two IL-12R, beta1 and beta2 on peripheral blood mononuclear cells (PBMCs) from normal donors, stimulated with polyclonal activators in the presence or absence of exogenous rhIL-12. Unstimulated peripheral blood T lymphocytes (PBTs) expressed moderate levels of IL-12Rbeta1 and very low to undetectable levels of IL-12Rbeta2. Superantigens and anti-CD3+anti-CD28 induced higher expression of both IL-12R on PBTs than PHA-P stimulation. Exogenous rhIL-12 further enhanced the PHA-P or anti-CD3+anti-CD28 induced IL-12Rbeta2 expression. Only a fraction of mitogen activated IL-12Rbeta1+ or beta2+ T lymphocytes co-expressed CD25 (with further enhancement by exogenous rhIL-12), while a higher percentage of these cells were CXCR3+. The majority of superantigen or anti-CD3+anti-CD28-induced IL-12R+ PBTs were positive for both CD25 and CXCR3 markers. Our results indicated differential induction of IL-12R expression that correlated with up regulation of CD25 and CXCR3 expression on activated PBTs and provide a useful insight for monitoring these markers during treatment of Th1 type inflammatory diseases.

PMID:
16165111
DOI:
10.1016/j.cellimm.2005.08.018
[Indexed for MEDLINE]

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