Deficient protein kinase a in systemic lupus erythematosus: a disorder of T lymphocyte signal transduction.

Abstract:

:Systemic lupus erythematosus (SLE) is an idiopathic autoimmune disease characterized by impaired T lymphocyte immune effector functions. We have identified a disorder of signal transduction in SLE T cells involving the cyclic AMP/protein kinase A (cAMP/PKA) pathway. Cyclic AMP-stimulated PKA-catalyzed protein phosphorylation is markedly diminished owing to profound deficiencies of both type I (PKA-I) and type II (PKA-II) isozyme activities. Deficient PKA-I isozyme is characterized by a significant reduction in the amount of type I regulatory beta subunit (RI beta) steady state mRNA by competitive polymerase chain reaction. This is associated with a 30% decrease in RI alpha protein and a 65% reduction in RI beta protein. Indeed, T cells from approximately 25% of SLE subjects have no detectable RI beta protein. Transient transfection of T cells not expressing RI beta protein with autologous SLE RI beta cDNA bypassed the block in translation, reconstituting PKA activity and augmenting IL-2 production. Of importance was the initial identification of novel RI alpha mRNA mutations characterized by heterogeneous transcript mutations, including deletions, transitions, and transversions. Most mutations are clustered adjacent to GAGAG motifs and CT repeats. By contrast, deficient PKA-II activity is the result of spontaneous dissociation of the cytosolic RII beta(2)C(2) holoenzyme, aberrant RII beta translocation to the nucleus from the cytosol, and retention of RII beta in the nucleus. In conclusion, distinct mechanisms account for deficient PKA-I and PKA-II isozyme activities in SLE T cells.

journal_name

Ann N Y Acad Sci

authors

Kammer GM

doi

10.1111/j.1749-6632.2002.tb04329.x

subject

Has Abstract

pub_date

2002-06-01 00:00:00

pages

96-105

eissn

0077-8923

issn

1749-6632

journal_volume

968

pub_type

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