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Contributions of the CD2 and CD28 T lymphocyte activation pathways to the regulation of the expression of the colony-stimulating factor (CSF-1) gene


Contributions of the CD2 and CD28 T lymphocyte activation pathways to the regulation of the expression of the colony-stimulating factor (CSF-1) gene



Journal of Immunology 149(2): 373-379



ISSN/ISBN: 0022-1767

PMID: 1352526

The T cell adhesion molecule CD28 provides a costimulatory signal, in combination with either CD2 or CD3 mAb. CD28 appears to regulate the expression, by T cells, of cytokines normally produced by accessory cells, namely IL-1 alpha, TNF-alpha, and CSF-1. The CSF-1 gene is expressed as a 4.0-kb transcript by human T cells activated with mAb directed against CD2 and CD28, alone or in combination. A kinetic analysis of its expression showed low steady-state levels of the transcript after CD2 stimulation, and a transient rise after CD28 stimulation. In contrast, a mean fivefold increase in the levels of the transcript was detected in CD2 plus CD28-stimulated cells. The potential mechanisms regulating this increase were investigated. The half-life of the CSF-1 transcript was identical in cells activated with either CD28 or CD2 plus CD28. Transcription of the CSF-1 gene appeared to undergo attenuation in resting cells as well as in cells activated via a single pathway; this attenuation was relieved in part by the combined CD2 plus CD28 stimulation. Thus in vitro costimulation via the CD2 and CD28 molecules regulates the expression of the CSF-1 gene mainly at the transcriptional level.

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Accession: 039680875

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