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Chronic Organophosphate Pesticide Exposure and Coronary Artery disease : finding a bridge

Abdullah, Nor Zamzila and Ishaka, Aminu and Samsuddin, Niza and Mohd Rus, Razman and Mohamed, Abdul Hadi (2011) Chronic Organophosphate Pesticide Exposure and Coronary Artery disease : finding a bridge. In: IIUM Research, Invention and Innovation Exhibition (IRIIE) 2011, 9-10 February 2011, Cultural Activity Centre (CAC) and KAED Gallery IIUM. (Unpublished)

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Organophosphates (OPs) are commonly used as pesticides in agriculture. They are hydrolyzed by paraoxonase (PON1) which is a high density lipoprotein (HDL) associated enzyme known for its function to hydrolyze OPs into a relatively harmless substance. PON1 is also known to prevent atherosclerosis by hydrolyzing oxidized-low density lipoprotein (ox-LDL) as well as preventing the accumulation of lipid peroxides on LDL. Reports showed low PON1 activity among OPs-exposed individuals, while low PON1 activity was associated with a high risk of coronary artery disease (CAD). The link between chronic OPs exposure and lipid parameters which are known risk factors of CAD has not yet been reported. This study aimed at comparing the activities of PON1 and lipid parameters (ox-LDL, TC, TG, LDL-C and HDL-C) between workers who are exposed to OPs and non-exposed comparative groups. A cross sectional study was carried among 53 selected pesticides sprayers from 4 farms in Kuantan who fulfilled the criteria and 50 control subjects who were age, ethnicity and income bracket-matched. Fasting serum samples were analyzed for TC, TG, LDL-C and HDL-C (lipid profiles), ox-LDL and PON1 activities after the hydrolysis of substrates paraoxon, phenylacetate and diazoxon. Results showed a significantly lower (p<0.05) diazoxonase activity (mean: 890.93vs 990.48 U/ml) and higher ox-LDL (median: 4.89 vs 2.83 mU/L) among the OPs-exposed group. The PON1 to ox-LDL ratio which probably reflect the ability of PON1 to hydrolyze ox-LDL were also significantly lower (p<0.001) among the OPs exposed group. There were no differences in lipid profiles (p>0.05) between the two groups. Our study suggested that OPs-exposed individuals might be predisposed to atherosclerosis and CAD through the decreased PON1 ability to hydrolyze ox-LDL but not through lipid profiles. A larger scale study is required to confirm our observation.

Item Type: Conference or Workshop Item (Poster)
Additional Information: 3746/13579
Subjects: R Medicine > RA Public aspects of medicine > RA1190 Toxicology
R Medicine > RB Pathology
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Medicine > Department of Basic Medical
Depositing User: Dr Nor Zamzila Abdullah
Date Deposited: 14 Mar 2012 11:29
Last Modified: 02 Apr 2012 14:27
URI: http://irep.iium.edu.my/id/eprint/13579

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