Increased Levels of Human Carotid Lesion Linoleic Acid Hydroperoxide in Symptomatic and Asymptomatic Patients Is Inversely Correlated with Serum HDL and Paraoxonase 1 Activity
نویسندگان
چکیده
Human carotid plaque components interact directly with circulating blood elements and thus they might affect each other. We determined plaque paraoxonase1 (PON1) hydrolytic-catalytic activity and compared plaque and blood levels of lipids, HDL, PON1, and HbA1c, as well as plaque-oxidized lipids in symptomatic and asymptomatic patients. Human carotid plaques were obtained from symptomatic and asymptomatic patients undergoing routine endarterectomy, and the lesions were ground and extracted for PON activity and lipid content determinations. Plaque PONs preserved paraoxonase, arylesterase, and lactonase activities. The PON1-specific inhibitor 2-hydroxyquinoline almost completely inhibited paraoxonase and lactonase activities, while only moderately inhibiting arylesterase activity. Oxysterol and triglyceride levels in plaques from symptomatic and asymptomatic patients did not differ significantly, but plaques from symptomatic patients had significantly higher (135%) linoleic acid hydroperoxide (LA-13OOH) levels. Their serum PON1 activity, cholesterol and triglyceride levels did not differ significantly, but symptomatic patients had significantly lower (28%) serum HDL levels and higher (18%) HbA1c levels. Thus LA-13OOH, a major atherogenic plaque element, showed significant negative correlations with serum PON1 activity and HDL levels, and a positive correlation with the prodiabetic atherogenic HbA1c. Plaque PON1 retains its activity and may decrease plaque atherogenicity by reducing specific oxidized lipids (e.g., LA-13OOH). The inverse correlation between plaque LA-13OOH level and serum HDL level and PON1 activity suggests a role for serum HDL and PON1 in LA-13OOH accumulation.
منابع مشابه
Effect of Pomegranate Juice on Paraoxonase Enzyme Activity in Patients with Type 2 Diabetes
OBJECTIVE: The aim of this study was to investigate the effect of pomegranate juice (PJ) on the paraoxonase and arylesterase activity of human serum paraoxonase( PON1). MATERIAL AND METHOD: Fifty patients with type 2 diabetes mellitus consumed 200 ml of PJ daily for a period of 6 weeks. Blood was collected from the patients before and after PJ consumption after 12 h of fasting. Blood sugar, to...
متن کاملSerum paraoxonase enzyme activity and oxidative stress in obese subjects.
INTRODUCTION Obesity is an important risk factor for atherosclerotic cardiovascular disease. Paraoxonase-1 (PON1) may play a significant role in the prevention of obesity-related accelerated atherosclerosis by hydrolyzing lipid peroxides in oxidized low-density lipoproteins. OBJECTIVES The aim of this study was to evaluate PON1 and arylesterase enzyme activities and lipid hydroperoxide (LOOH)...
متن کاملParaoxonase 1 Activity, Lipid Profile, and Atherogenic Indexes Status in Coronary Heart Disease
Background: Dyslipidemia is considered an independent risk factor for coronary heart disease (CHD). In the present study, we examined lipid profiles and paraoxonase 1 (PON1) activity and atherogenic indexes status and the relationship of PON1 activity by high-density lipoprotein (HDL) and atherogenic indexes in CHD patients and healthy people. Methods: The aim of the study was to compare PON...
متن کاملParaoxonase and Arylesterase Activities in Patients with Cancer
Background: Cancer has the highest disease-related mortality rate in Iran. Reduced activity of paraoxonase reported in patients with cancer may be due to a reduction in its antioxidant properties and a subsequent increased risk of developing cancer. We aimed to assess antioxidant and oxidative status in patients with cancer through measuring the activity of PON1 as an antioxidant enzyme and det...
متن کاملمطالعه فنوتیپها و فعالیت آنزیم پارااکسوناز در بیماران مبتلا به گرفتگی عروق کرونر
Paraoxonase can hydrolyse organophosphate esters and paraxon is its most important substrate in laboratory studies. This enzyme circulates in blood with HDL. It seems that reduced paraoxonase activity in human may increase risk of coronary artery disease. Genetic variations in two autosomal genes may reduce its activity. These variations produce three phenotypes: A, AB and B. B phenotype ac...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
دوره 2012 شماره
صفحات -
تاریخ انتشار 2012