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. 1993 Sep 1;90(17):7946–7950. doi: 10.1073/pnas.90.17.7946

Antisense oligodeoxynucleotides to the blk tyrosine kinase prevent anti-mu-chain-mediated growth inhibition and apoptosis in a B-cell lymphoma.

X R Yao 1, D W Scott 1
PMCID: PMC47264  PMID: 7690139

Abstract

Crosslinking of membrane immunoglobulin (mIg) receptors by anti-Ig causes growth inhibition and subsequent cell death due to apoptosis in a murine B-cell lymphoma model. The earliest signal transduction via mIg has recently been shown to be dependent on the activation of one or more protein tyrosine kinases (PTKs). In this study, we utilized the CH31 lymphoma, which is extremely sensitive to growth inhibition by anti-Ig, to examine the role of PTKs in cell cycle arrest. This cell line expresses multiple PTKs, whose activities are stimulated by crosslinking mIg. To determine whether PTK activity is essential for the inhibition of cell growth, we exposed CH31 cells to antisense oligodeoxynucleotides for the blk PTK prior to the growth inhibition assay. We found that exposure of CH31 cells to blk antisense effectively prevented anti-mu-chain-mediated growth inhibition and subsequent apoptosis. Corresponding blk sense or antisense oligonucleotides for other PTKs had no protective effect against anti-mu. Moreover, antisense blk oligonucleotides had no effect on transforming growth factor beta-mediated growth arrest and apoptosis. Further experiments showed significantly reduced endogenous p55blk in blk antisense-treated cells. In addition, anti-mu stimulation of antisense-treated cells failed to induce any detectable increase in kinase activity of p55blk, a result suggesting the uncoupling of blk proteins from normal signal pathways that are essential for growth inhibition. These results implicate a role of blk kinase in anti-mu-mediated pathway to cell cycle arrest.

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