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Changes in the frequency of splenic immunocompetent cells in rats exposed to carbon monoxide during gestation
A Giustino1, M R Carratu, G Siro Brigiani
1Institute of Pharmacology, School of Medicine, University of Bari, Italy.
Insights
Prenatal exposure to carbon monoxide (CO) can decrease immune cell counts in young rats, but these effects are reversible. This study highlights subtle immunological changes from gestational CO exposure without obvious toxicity.
Area of Science:
- Immunology
- Toxicology
- Developmental Biology
Background:
- Prenatal exposure to environmental toxins can impact immune system development.
- Carbon monoxide (CO) is a common environmental pollutant with potential developmental effects.
- Previous research suggests moderate CO exposure may cause subtle immunological changes.
Purpose of the Study:
- To investigate the effects of prenatal carbon monoxide (CO) exposure on splenic cell populations in young and aged rats.
- To determine if low-to-moderate concentrations of CO during gestation alter immune cell frequencies.
- To assess the reversibility of any observed immunological changes.
Main Methods:
- Wistar rats were exposed to 75 or 150 ppm of CO during pregnancy (days 0-20).
- Splenic cell populations were analyzed in offspring at 15-21 days and 18 months of age.
- Flow cytometry was used to quantify cell types including leucocyte common antigen (LCA+), macrophages, MHC II, T lymphocytes, and B lymphocytes.
Main Results:
- Prenatal exposure to 150 ppm CO significantly reduced LCA+ cells in 21-day-old male rats.
- Other immune cell populations (macrophages, MHC II, T and B lymphocytes) showed a trend towards reduction but did not reach statistical significance.
- Observed alterations in LCA+ cell frequency were reversible in later life.
Conclusions:
- Gestational exposure to moderate CO concentrations can lead to reversible, subtle immunological alterations in offspring.
- These findings indicate potential impacts on immune cell development without overt signs of toxicity.
- Further research is warranted to understand the long-term implications of prenatal CO exposure on immune function.
Abstract:
The aim of the present study was to evaluate whether prenatal exposure to relatively low concentrations of carbon monoxide (CO) may alter the frequency of splenic cells either in young (15-21 days) or in aged rats (18 months). Wistar female rats were exposed to 75 and 150 ppm of CO from day 0 to day 20 of pregnancy, respectively. The results show that prenatal exposure to 150 ppm of CO significantly decreases the number of leucocyte common antigen (LCA+) cells in 21 day old male rats, whereas other cellular populations, such as macrophages, Major Histocompatibility (MHC) II cells, T and B lymphocytes display only a trend towards a reduction without achieving statistical significance. The alterations in LCA+ cell frequency produced by gestational exposure to CO were reversible. These data further extend previous findings showing that rats prenatally exposed to moderate concentrations of CO exhibit subtle immunological changes in the absence of overt signs of toxicity.