title: p56lck activity and expression in peripheral blood lymphocytes from patients with systemic lupus erythematosus.
abstract: In this study we analyzed the activity and the expression of p56lck protein tyrosine kinase in peripheral blood lymphocytes (PBLs) from systemic lupus erythematosus (SLE) patients and from healthy donors. The p56lck activity, determined by a non-radioactive Tyrosine Kinase Assay Kit, was significantly higher in active SLE PBLs and discriminated this group of patients from inactive SLE patients (p = 0.002) and healthy donors (p = 0.009). p56lck level decreased in SLE lymphocytes (especially for inactive SLE lymphocytes, p = 0.005) when compared to healthy donors. These differences were also reflected by the specific activity of p56lck that was clearly elevated in active SLE lymphocytes when compared to inactive SLE (p = 0.022) or healthy donors lymphocytes (p = 0.006). A positive correlation between the activity of p56lck and the tyrosine phosphorylation level in active SLE lymphocytes was found.
authors.affiliation: Department of Immunology, Cantacuzino Institute, Bucharest, Romania.
authors.forename: C
authors.initials: C
authors.lastname: Matache
authors.forename: M
authors.initials: M
authors.lastname: Stefanescu
authors.forename: A
authors.initials: A
authors.lastname: Onu
authors.forename: S
authors.initials: S
authors.lastname: Tanaseanu
authors.forename: I
authors.initials: I
authors.lastname: Matei
authors.forename: R
authors.initials: R
authors.lastname: Frade
authors.forename: G
authors.initials: G
authors.lastname: Szegli
mesh_terms: D000818:Animals; D005260:Female; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000276:immunology*; D019860:Lymphocyte Specific Protein Tyrosine Kinase p56(lck) / Q000378:metabolism*; D008214:Lymphocytes / Q000201:enzymology*; D010766:Phosphorylation; D011518:Proto-Oncogene Proteins / Q000032:analysis; D051076:Proto-Oncogene Proteins c-fyn; D011817:Rabbits; D014443:Tyrosine / Q000378:metabolism
chemical_list: D011518:Proto-Oncogene Proteins; D014443:Tyrosine; C494957:FYN protein, human; D019860:Lymphocyte Specific Protein Tyrosine Kinase p56(lck); D051076:Proto-Oncogene Proteins c-fyn