title: Anti-apolipoprotein A-I antibodies and paraoxonase 1 activity in Systemic Lupus Erythematosus.
abstract: Systemic lupus erythematosus (SLE) patients have an increased risk of atherosclerosis. Identification of at-risk patients and the pathogenesis of atherosclerosis in SLE remain elusive. Paraoxonase 1 (PON1) and anti-apolipoprotein A-I antibody (anti-Apo A-I) appear to have a potential role in premature atherosclerosis in SLE. The aim of this work was to study PON1 activity and anti-Apo A-I antibody in SLE female patients and to demonstrate their relations to disease activity as well as disease related damage. Forty SLE female patients and 40 apparently healthy volunteers were included. Anti-Apo A-I antibodies levels and PON1 activity levels were assessed. Systemic Lupus Erythematosus Disease Activity Index (SLEDAI) and systemic Lupus International Collaboration Clinics (SLICC)/American College of Rheumatology (ACR) damage index were preformed in all patients. Compared with controls, SLE patients showed significantly lower PON1 activity and significantly higher titers of anti-Apo A-I. Anti-Apo A-I antibody titers correlated inversely with PON1 activity. Elevated titers of anti-Apo A-I antibody and reduced PON activity were related to increased SLEDAI and (SLICC/ACR) damage index scores. We concluded that there is decreased PON1 activity and formation of anti-Apo A-I antibodies in female patients with SLE. SLE-disease activity assessed by SLEDAI and SLE disease related organ damage assessed by SLICC/ACR damage index are negatively correlated with PON1 activity and positively correlated with anti-Apo A-I antibodies. PON1 activity and anti-Apo A-I antibodies might be involved in the pathogenesis of atherosclerosis in SLE patients.
authors.affiliation: Internal Medicine Department, National Research Centre, Cairo, Egypt.
authors.forename: Mohammed Mahmoud
authors.initials: MM
authors.lastname: Ahmed
authors.affiliation: Rheumatology and Rehabilitation Department, Cairo University, Cairo, Egypt.
authors.forename: Eman Mahmoud
authors.initials: EM
authors.lastname: Elserougy
authors.affiliation: Rheumatology and Rehabilitation Department, Cairo University, Cairo, Egypt.
authors.forename: Iman Ibrahim
authors.initials: II
authors.lastname: Al-Gazzar
authors.affiliation: Internal Medicine Department, National Research Centre, Cairo, Egypt.
authors.forename: Iman Mohamed
authors.initials: IM
authors.lastname: Fikry
authors.affiliation: Medical Biochemistry Department, National Research Centre, Cairo, Egypt.
authors.forename: Dawoud Fakhry
authors.initials: DF
authors.lastname: Habib
authors.affiliation: Internal Medicine Department, National Research Centre, Cairo, Egypt.
authors.forename: Khaled Mohamed
authors.initials: KM
authors.lastname: Younes
authors.affiliation: Toxicology and Narcotics Department, National Research Centre, Cairo, Egypt.
authors.forename: Neveen Abd El-Hameed
authors.initials: NA
authors.lastname: Salem
keywords: SLE; anti-apolipoprotein A-I antibodies; paraoxonase 1