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Expression of the pim-1 protooncogene: differential inducibility between alpha/beta- and gamma/delta-T cells and B cells.

Abstract：

:The pim-1 gene encodes a serine/threonine protein kinase with expression restricted primarily to cells of hematopoietic lineage and is thought to play a role in the signal transduction events associated with lymphocyte activation. A rapid increase in pim-1 mRNA levels was found after stimulation of normal unseparated PBMCs with phorbol ester (PMA) and a calcium ionophore (ionomycin) with the peak level occurring 4 hr poststimulation. Treatment of PBMCs with ionomycin alone caused only a minimal increase in pim-1 mRNA, whereas treatment with PMA alone induced a large increase in pim-1 mRNA, suggesting that the activation of a signaling pathway involving protein kinase C is responsible for the accumulation of this transcript. In enriched subpopulations of resting alpha/beta-T cells, gamma/delta-T cells, and B cells, pim-1 expression was found to be constitutively expressed, albeit at lower levels in T cells. This basal level of pim-1 expression could be increased by stimulation of alpha/beta-T cells (approx fivefold) and gamma/delta-T cells (approximately sevenfold) with PMA plus ionomycin. In contrast, pim-1 expression was not inducible in B cells. In PBMCs, half-life determination studies showed that turnover of pim-1 mRNA was markedly prolonged as a result of message stabilization induced by PMA plus ionomycin treatment. In addition, stable pim-1 transcripts were also observed in all transformed lymphoid cell lines examined. Taken together, these results suggest that the stability of pim-1 transcripts may be linked to the regulation of cell growth and represent the first direct demonstration that pim-1 expression is indeed regulated in a cell-type-specific manner.

journal_name

Cell Immunol

journal_title

Cellular immunology

authors

Wingett D,Stone D,Davis WC,Magnuson NS

doi

10.1006/cimm.1995.1059

subject

Has Abstract

pub_date

1995-04-15 00:00:00

pages

123-30

issue

1

eissn

0008-8749

issn

1090-2163

pii

S0008-8749(85)71059-3

journal_volume

162

pub_type

杂志文章

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