Investigations on immune parameters in welders

Area of Science:

• Occupational Health
• Immunotoxicology
• Environmental Medicine

Background:

• Occupational exposure to welding fumes is prevalent.
• The impact of welding fumes on the human immune system requires further investigation.

Purpose of the Study:

• To investigate the effects of occupational welding fume exposure on cellular, non-specific, and humoral immune responses.
• To correlate immune function changes with reported health issues in welders.

Main Methods:

• Assessed cellular immunity via T cell responses and lymphocyte phenotyping.
• Quantified non-specific immunity through granulocyte oxidative burst and LAK cell cytotoxicity.
• Evaluated humoral immunity by measuring serum immunoglobulin levels and B cell production.
• Compared immune parameters between 30 male welders and 16 non-exposed controls.

Main Results:

• Welding fumes significantly retarded T cell DNA synthesis kinetics post-phytohaemagglutinin stimulation.
• Cytotoxic activity of lymphokine-activated killer (LAK) cells was reduced in welders.
• No significant effects were observed in lymphocytic subpopulations, mixed lymphocyte reactions, phagocytosis, or immunoglobulin production.
• Reported symptoms like respiratory infections and bronchitis were common among welders but not directly linked to measured immune impairments.

Conclusions:

• Welding fumes can negatively impact specific immune functions, including T cell proliferation and LAK cell cytotoxicity.
• The observed immune alterations, particularly reduced LAK cell activity, may contribute to health issues in exposed workers, though direct correlations were limited.
• Further research is needed to fully elucidate the immunotoxicological effects of welding fumes and their clinical relevance.