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. 1988 Feb;85(3):792–796. doi: 10.1073/pnas.85.3.792

Mobility of the human T lymphocyte surface molecules CD3, CD4, and CD8: regulation by a cAMP-dependent pathway.

G M Kammer 1, C A Boehm 1, S A Rudolph 1, L A Schultz 1
PMCID: PMC279641  PMID: 2829202

Abstract

The present study was undertaken to determine whether a cAMP pathway mediates the mobility of CD3, CD4, and CD8 within the membrane. Crosslinking CD3, CD4, and CD8 with monoclonal antibody and anti-antibody induced rapid accumulation of intracellular cAMP, occupancy of cAMP receptors, and was temporally associated with the mobilization and directed movement of these molecules to a pole of the cell. This capping process could be partially inhibited in a dose-dependent manner by treatment of T cells with 2',5'-dideoxyadenosine, a ribose-modified adenosine analogue that binds to the P site of the catalytic subunit of adenylate cyclase and reduces adenylate cyclase activity. Furthermore, inhibition of cAMP-dependent endogenous phosphorylation of 17.5-kDa, 23/25-kDa, and 33.5-kDa bands in intact T cells by N-[2-(methylamino)ethyl]-5-isoquinoline-sulfonamide, a cell-permeable inhibitor of cyclic nucleotide-dependent protein kinase, blocked the capping event. Data support the conclusion that crosslinking of CD3, CD4, and CD8 activates a cAMP-dependent pathway that mediates the mobilization and directed movement of these molecules. cAMP-dependent protein phosphorylation is an integral step leading to the capping process.

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Selected References

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