Organochlorine Pesticide Exposure in Residents Near Lake Apopka

Completed

• Conditions: Pesticide Exposure
• Interventions: Other: Blood Collection

• Registration Number: NCT02530814
• Lead Sponsor: University of Florida

Brief Summary

In the Lake Apopka, Florida area for over 50 years starting in the 1940s, organochlorine pesticides (OCPs) including 4,4'-dichlorodiphenyltrichloroethane (DDT), dieldrin, chlordane, toxaphene and more recently methoxychlor were sprayed on farmlands in order to control pests and to improve crop harvests. For most of those years, the farmworkers were exposed to the pesticides as part of their work. Because of their lipophilic (fat soluble) nature, these organochlorine pesticides (OCPs) are readily taken up into the body and not readily eliminated. Therefore, they can be detected in exposed individuals for many years after the exposure. There is some evidence that certain OCPs can cause or exacerbate medical problems in sensitive individuals. For example, exposure to some OCPs has been associated with development of Parkinsonism. Exposure to other OCPs has been associated with development of lupus erythematosus, an auto-immune disease. Other adverse effects of exposure to OCPs are endocrine disruption because some OCPs mimic estrogens and others mimic androgens, or may have mixed interactions with steroid receptors.

In this research study the investigators aim is to test the blood from former farmworkers during the 1940s through the late 1970s who reside in the Lake Apopka area for OCPs and for the auto-antibodies. In addition, questionnaires will provide insight on their health status and health concerns.

Detailed Description

In this research study, a onetime blood test will be collected from former farmworkers during the 1940s through the late 1970s who reside in the Lake Apopka area for OCPs and for the auto-antibodies. In addition, questionnaires will provide insight on their health status and health concerns.

The investigators will collect existing data from the National Health and Nutrition Examination Survey (NHANES) which has monitored the pesticide exposure (with the exception of toxaphene) of people older than 8 years, so there is information on the range of concentrations of these chemicals in the blood of Americans. This data will be use as the control group for comparison with the values found for OCP concentrations.

Study Timeline

• Study First Submitted: 2015-08-18
• Study First Submitted QC: 2015-08-19
• Study First Posted: 2015-08-21
• Study Start: 2015-11
• Primary Completion: 2016-03
• Study Completion: 2016-03
• Status Verified: 2019-09
• Last Update Submitted: 2019-09-17
• Last Update Posted: 2019-09-19

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 20

Inclusion Criteria

• Persons who worked on farms near lake Apopka, Florida up to 1998.
• Preference will be given to those who worked on the farms for over 10 years.

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Exclusion Criteria

• Persons who did not work on farms near Lake Apopka, Florida up to 1998.

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Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
Lake Apopka Farmworkers	Blood Collection	This group will have a onetime blood collection and questionnaires regarding health status and health concerns.

Primary Outcome Measures

Name	Time	Method
Blood levels of organochlorine pesticides will be compared between the groups	Day 1	Blood collected will be analyzed for DDT, dieldrin, chlordane, methoxychlor and the metabolites of DDT and methoxychlor. The data will be compared between the groups.

Secondary Outcome Measures

Name	Time	Method
Level of auto-antibodies will be recorded	Day 1	Blood collected will be analyzed for measurement of auto-antibodies

Trial Locations

Locations (1)

University of Florida; 🇺🇸 Gainesville, Florida, United States