title: The role of 'paraoxonase-1 activity' as an antioxidant in coronary artery diseases.
abstract: OBJECTIVE
  A majority of the Coronary Artery Diseases (CAD) result from complications of atherosclerosis. There is a growing body of evidence which has revealed that the reduced activity of the HDL-associated enzyme, paraoxonase1 (PON1), is predictive of vascular disease in humans, which include the results from prospective studies. The mechanisms by which PON1 activity influences risk of vascular disease continue to be evaluated. It is generally thought that PON1 contributes to the antioxidant, and thus, to the antiatherogenic properties of High Density Lipoproteins (HDL). Depleted antioxidant levels could be a risk factor for coronary artery disease. Hence, this study was done to evaluate PON1, as antioxidant, in CAD patients.
  
  
  METHODS
  This study was done to determine serum levels of PON1 activity in 50 controls and in 60 clinically and ECG proven CAD cases and to compare PON1 activity with total cholesterol and triglycerides.
  
  
  RESULTS
  Serum levels of PON1 activity (p<0.001) were significantly lower in CAD cases than in controls. Serum total cholesterol (p< 0.001) and triglyceride (p< 0.001) levels were significantly higher in CAD cases than in controls. There was a negative correlation between PON 1 activity and total cholesterol and triglycerides. The negative correlation between PON1 activity and total cholesterol was significant (p<0.05).
  
  
  CONCLUSIONS
  From our present study, we can conclude that PON1 can exert a protective effect on HDL by preventing its oxidative damage. Further, a decreased PON 1 activity may be a risk factor for CAD, which is likely to be explained by derangement of PON 1 activity towards lipid peroxidation. This study suggested that serum antioxidant activity of PON1 was an important factor which provided protection from oxidative stress and lipid peroxidation in CAD. Thus, evaluating the effects of PON 1 for CAD patients may be promising in the treatment and prognosis of CAD.
authors.affiliation: Assistant Professor, Department of Biochemistry Vijayanagar Institute of Medical Sciences Contoment, Bellary-583104, Karnataka, India.
authors.forename: Maharudra
authors.initials: M
authors.lastname: Shekhanawar
authors.forename: Sarala M
authors.initials: SM
authors.lastname: Shekhanawar
authors.forename: D
authors.initials: D
authors.lastname: Krisnaswamy
authors.forename: V
authors.initials: V
authors.lastname: Indumati
authors.forename: D
authors.initials: D
authors.lastname: Satishkumar
authors.forename: V
authors.initials: V
authors.lastname: Vijay
authors.forename: T
authors.initials: T
authors.lastname: Rajeshwari
authors.forename: M
authors.initials: M
authors.lastname: Amareshwar
keywords: Antioxidants; Coronary artery disease; Oxidative stress; Paraoxonase1