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Oxidized- Low Density Lipoprotein level among Organophosphates (OPs) Pesticide Exposed Workers

Abdullah, Nor Zamzila and Ishaka, Aminu and Samsuddin, Niza and Mohd Rus, Razman and Mohamed, Abdul Hadi (2010) Oxidized- Low Density Lipoprotein level among Organophosphates (OPs) Pesticide Exposed Workers. In: 9th Annual Scientific Meeting, College of Pathologist AMM 2010, 26th June 2010, Universiti Putra Malaysia. (Unpublished)

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Background: Organophosphate (OP) is one of the widely used pesticides worldwide. It has been shown to induce oxidative stress in both animal and human. Oxidative stress may stimulate the oxidation of lipoprotein particularly the low density-lipoprotein (LDL) which is known to promote atherogenesis. PON1 is high density-lipoprotein (HDL) related enzyme which is recognized for its function to hydrolyze OPs into a relatively less toxic substance and prevent atherosclerosis by hydrolyzing oxidized-LDL (ox-LDL). Low PON1 activities were reported in OPs exposed individuals, while in different studies it was associated with a higher risk of coronary artery disease (CAD). However, a link between chronic OP exposure, PON1 activity and ox-LDL which is known for its contribution in the development of atherosclerosis has not yet been reported. The aim of this report was to compare the level of PON 1 activities and ox-LDL between workers who are exposed to OPs and the comparative non-exposed group. Methods: A cross sectional study was carried among 51 selected pesticides sprayers from 4 farms in Kuantan who fulfilled the criteria while 48 control subjects were selected based on matching process of age, ethnicity and income bracket. Serum samples were analyzed for ox-LDL by ELISA method while PON1 activities were determined spectrophotometrically after the hydrolysis of substrates paraoxon, phenylacetate and diazoxon. Results: A significantly lower diazoxonase activity and higher ox-LDL level (p<0.001) was observed among the OP exposed group. The PON1 to ox-LDL ratio which probably reflect the ability of PON1 to hydrolyze ox-LDL were also significantly lower (p<0.05) among the OPs exposed group. Conclusion: Our data demonstrated that the increased ox-LDL may result from the reduced serum antioxidant capacity of PON1 in OPs exposed individuals. This may contribute to the development of atherosclerosis. A larger scale study is required to confirm our observation.

Item Type: Conference or Workshop Item (Poster)
Additional Information: 3746/13733
Uncontrolled Keywords: oxidized low density lipoprotein, organophosphate, paraoxonase
Subjects: R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine
R Medicine > RA Public aspects of medicine > RA1190 Toxicology
R Medicine > RB Pathology
Kulliyyahs/Centres/Divisions/Institutes: Kulliyyah of Medicine > Department of Basic Medical
Depositing User: Dr Nor Zamzila Abdullah
Date Deposited: 16 Mar 2012 08:03
Last Modified: 16 Mar 2012 08:04
URI: http://irep.iium.edu.my/id/eprint/13733

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