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Open AccessArticle

Thyroid Hormones in Conventional and Organic Farmers in Thailand

1
Department of Occupational Health and Safety, Faculty of Public Health, Mahidol University, 420/1 Rajvidhi Road, Bangkok 10400, Thailand
2
Center of Excellence on Environmental Health and Toxicology, EHT, Bangkok 10400, Thailand
3
Mahidol University, Nakhonsawan Campus, Nakhon Sawan 60000, Thailand
4
Faculty of Public Health, Thammasat University Lampang Campus, Lampang 52190, Thailand
5
Buddhachinaraj Phitsanulok, 90 Sithamma traipidok Road, Muang, Phitsanulok 65000, Thailand
6
Department of Public Health, University of Massachusetts Lowell, One University Ave, Lowell, MA 01854-2867, USA
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2019, 16(15), 2704; https://doi.org/10.3390/ijerph16152704
Received: 24 June 2019 / Revised: 24 July 2019 / Accepted: 26 July 2019 / Published: 29 July 2019
(This article belongs to the Special Issue Endocrine Disruptor, Exposure and Potential Health Impact)
Pesticides can act as endocrine disruptors by different mechanisms including inhibition of iodine absorption, increases in thyroid hormone clearance, decreased cellular uptake of thyroid hormones, or changes in expression of thyroid hormone regulated genes. This study examined how exposure to pesticides impacts thyroid hormone levels, thyroid stimulating hormone (TSH), triiodothyronine (T3), thyroxine (T4), free T3 (FT3), and free T4 (FT4) by comparing conventional (n = 195) and organic farmers (n = 222), and by evaluating which types of pesticides might be associated with changes in thyroid hormone levels. Questionnaires were used to collect information about farmer characteristics, self-reported stress, agricultural activities, and history of pesticide use. Conventional farmers were asked to report the type and quantity of pesticides used each day. The TSH, FT3, T3, and T4 levels of conventional farmers were 1.6, 1.2, 1.3, and 1.1 times higher than those of organic farmers, respectively, after adjusting for covariates. Several specific herbicides had a significant relationship between the amount applied and an increase in thyroid hormone levels, after covariate adjustment. They included: paraquat (TSH, FT3 and T3); acetochlor (FT4); atrazine (TSH, FT3 and T3); glyphosate (T4); diuron (TSH) and the “other” herbicides including alachlor, propanil, and butachlor (FT4 and T3). The most commonly used herbicide among conventional farmers was glyphosate, followed by paraquat, 2,4-dichlorophenoxyacetic acid (2,4-D). These findings suggest that exposure to pesticides could impact the development of metabolic diseases and other health outcomes by altering the endocrine system (the thyroid hormone levels) through the hypothalamic–pituitary–thyroid (HPT) axis. This work is a part of a longitudinal study which will evaluate the sub-chronic effects of repeated exposure to different types of pesticides on thyroid hormone levels. View Full-Text
Keywords: conventional farmers; organic farmers; pesticides; thyroid hormone conventional farmers; organic farmers; pesticides; thyroid hormone
MDPI and ACS Style

Kongtip, P.; Nankongnab, N.; Kallayanatham, N.; Pundee, R.; Choochouy, N.; Yimsabai, J.; Woskie, S. Thyroid Hormones in Conventional and Organic Farmers in Thailand. Int. J. Environ. Res. Public Health 2019, 16, 2704.

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