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[Immunotoxicology in occupational and environmental medicine: prospectives, limitations, and research objectives]
C Colosio1, W Barcellini, E Corsini
1International Centre for Pesticide Safety, Busto Garolfo, MI.
Abstract:
The immune system is able to recognize and neutralize potentially harmful agents, conferring to the organism resistance to infectious and malignant diseases. The authors have reviewed the literature and identified a group of substances able to enhance and/or reduce different immune functions, both in an experimental model and in occupational and environmental human exposure. The group includes several polyhalogenated hydrocarbons, particularly polychlorinated biphenyls, polybrominated biphenyls, tetrachloro-dibenzo-p-dioxin (TCDD), some metals like lead, cadmium and mercury, pesticides, i.e. dithiocarbamates and organotin compounds, organic solvents. The observed changes are usually slight and do not allow prognostic conclusion. In this study, the authors propose a 3-level rank of tests suitable for the immune evaluation of individuals occupationally exposed to xenobiotics, divided into three levels, as follows: tier 1: immunoglobulin classes (IgG, IgA, IgM), complement fractions (C3, C4), rheumatoid factor, and non-organ specific autoantibodies (AMA, SMA, ANA); CD3, CD4, CD8, CD57, CD20, HLA-DR; CD3/HLA-DR positive lymphocyte subsets; tier 2: determination of the mitotic response of peripheral blood lymphocytes to phytohaemoagglutinin, anti-CD3 monoclonal antibody, phorbol-myristate-acetate (PMA) and polyclonal immunoglobulin production after stimulation with pokeweed mitogen; tier 3: cytokine production with and without mitogen stimulation. The approach is "step by step" and assumes the need of a closely integrated and comparative evaluation of the findings obtained. The protocol could be used in research fields; moreover, some of the tests could be useful in the monitoring of persons exposed in the environment or in the workplace to immunotoxic substances or to biological agents.
Insights
This study identifies xenobiotics like PCBs and heavy metals that affect immune function. It proposes a tiered testing approach for evaluating immune responses in occupationally exposed individuals.
Area of Science:
- Immunotoxicology
- Environmental Health
- Occupational Medicine
Context:
- The immune system protects against disease, but exposure to environmental and occupational xenobiotics can alter immune function.
- Previous research has identified various substances, including polyhalogenated hydrocarbons, metals, pesticides, and organic solvents, that impact immune responses.
- Observed immune changes are often subtle, making prognosis difficult without standardized evaluation methods.
Purpose:
- To review literature on xenobiotic immunomodulation and propose a structured, tiered testing protocol for assessing immune function in occupationally exposed individuals.
- To establish a systematic approach for evaluating the immune system's response to xenobiotic exposure in research and occupational settings.
- To provide a framework for monitoring individuals exposed to potentially immunotoxic substances in the environment or workplace.
Summary:
- The study reviews known immunomodulatory xenobiotics, such as polychlorinated biphenyls (PCBs), lead, cadmium, mercury, and pesticides.
- A three-tiered testing protocol is proposed for immune evaluation, starting with basic markers (immunoglobulins, complement, autoantibodies, lymphocyte subsets) and progressing to functional assays (mitotic response, cytokine production).
- This step-by-step, integrated approach aims to provide a comprehensive assessment of xenobiotic-induced immune changes.
Impact:
- The proposed tiered testing protocol offers a standardized method for assessing immune function in individuals exposed to immunotoxic substances.
- This framework can aid in research and occupational health monitoring, potentially identifying risks and informing protective measures.
- The findings contribute to understanding xenobiotic impacts on immune health and developing strategies for risk management.