Developmental stage-specific changes in immunological biomarkers in male C3H/HeN mice after early life toluene...

Area of Science:

• Environmental Toxicology
• Immunology
• Developmental Biology

Background:

• Toluene is a volatile organic compound with widespread environmental presence.
• Early life exposure to environmental toxins can disrupt normal development, including immune system maturation.
• Understanding the impact of low-level toluene exposure on developing immune systems is crucial for public health.

Purpose of the Study:

• To investigate the effects of developmental toluene exposure on immunological biomarkers in infant mice.
• To determine if the timing of toluene exposure influences the immune response.
• To assess changes in immune cell populations and cytokine expression following toluene exposure.

Main Methods:

• Exposure of pregnant mice and pups to filtered air (control), 5 ppm, or 50 ppm toluene during specific gestational and postnatal days.
• Analysis of immunological biomarkers in blood and spleen of PND 21 and PND 42 male mice.
• Utilized ELISA, real-time RT-PCR, flow cytometry, and histological analysis.

Main Results:

• Reduced plasma total IgG1 levels in mice exposed to 5 ppm toluene during all developmental stages.
• Suppressed splenic T lymphocyte subsets and mRNA expression of IL-12, T-bet, and Foxp3 in mice exposed during PNDs 8-12.
• Observed alterations in other immunological biomarkers at PND 42 following early toluene exposure.

Conclusions:

• Early life toluene exposure induces developmental stage-specific changes in immunological biomarkers.
• The timing of toluene exposure is critical in determining the observed immunological effects.
• Findings highlight the potential for environmental solvents to impact immune development during sensitive life stages.