Dysregulation of p56lck kinase in patients with systemic lupus erythematosus.

Abstract:

:In this study we investigated one of the possible mechanisms of p56lck down-regulation in peripheral blood lymphocytes (PBLs) from Systemic Lupus Erythematosus (SLE) patients and we correlated p56lck dysregulation with accelerated apoptosis in SLE PBLs. PBLs from SLE patients and healthy donors were isolated. p56lck protein expression and lck mRNA level were estimated by immunoblotting and RT-PCR, respectively. FACS analysis was used to evaluate the apoptosis and p56lck levels in apoptotic and non-apoptotic PBLs. A non-radioactive Tyrosine Kinase Assay Kit was used to measure p56lck activity. Our results demonstrated that PBLs from SLE patients displayed lower levels of lck mRNA and p56lck protein as compared to healthy donors. The apoptosis of fresh or cultured PBLs was enhanced in SLE patients, especially in anti-DNA negative group. The expression of p56lck was inverse correlated with apoptosis of fresh and cultured SLE PBLs, especially in anti-DNA negative patients. Double staining FACS analysis showed that p56lck expression was lower in apoptotic than in non-apoptotic PBLs. p56lck specific activity was directly correlated to apoptosis in SLE PBLs. While the low expression of p56lck may be the result of lower degree of synthesis, the increased specific activity could directly correlated to the extent of apoptosis in SLE PBLs. Based on our observations, we assume that the p56lck dysregulation could play a role in SLE pathogenesis.

journal_name

Autoimmunity

journal_title

Autoimmunity

authors

Matache C,Onu A,Stefanescu M,Tanaseanu S,Dragomir C,Dolganiuc A,Szegli G

doi

10.3109/08916930108994123

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

27-38

issue

1

eissn

0891-6934

issn

1607-842X

journal_volume

34

pub_type

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