Related Experiment Videos
Effects of early postnatal exposure to low concentrations of carbon monoxide on cognitive functions in rats
M Tattoli1, M R Carratù, T Cassano
1Department of Pharmacology and Human Physiology, Section of Pharmacology, University of Bari*b2Policlinico, Piazza Giulio Cesare, Bari, 70124, Italy.
Insights
Early carbon monoxide (CO) exposure in newborn rats did not impair cognitive functions later in life. However, prenatal CO exposure caused lasting learning and memory deficits, highlighting developmental vulnerability.
Area of Science:
- Neuroscience
- Developmental Biology
- Toxicology
Background:
- Carbon monoxide (CO) exposure during development can impact brain function.
- Understanding the timing of exposure is crucial for assessing neurodevelopmental risks.
- Previous research suggests prenatal CO exposure leads to cognitive deficits.
Purpose of the Study:
- To investigate the long-term cognitive effects of early postnatal carbon monoxide (CO) exposure in rats.
- To compare the neurofunctional consequences of early postnatal CO exposure with those of prenatal CO exposure.
- To determine the critical developmental windows for CO-induced neurotoxicity.
Main Methods:
- Male Wistar rats were exposed to 75 and 150 ppm of CO from postnatal day 1 to 10.
- Cognitive functions were assessed using an active avoidance task at 3 and 18 months of age.
- Results were compared with previous findings on prenatal CO exposure.
Main Results:
- Early postnatal CO exposure did not affect the acquisition or reacquisition of the active avoidance task in adult or aged rats.
- Prenatal CO exposure (previously studied) induced long-lasting learning and memory deficits.
- The neurofunctional outcomes differed significantly based on the timing of CO exposure (prenatal vs. early postnatal).
Conclusions:
- The developing brain's vulnerability to CO-induced hypoxia depends critically on the developmental period of exposure.
- Prenatal CO exposure poses a greater risk for long-term cognitive impairment than early postnatal exposure.
- Neurodevelopmental sequelae are distinct for prenatal versus early postnatal CO exposure.
Abstract:
Male Wistar rats were exposed to 75 and 150 ppm of carbon monoxide (CO) from day 1 after birth until postnatal day 10 and their cognitive functions were evaluated at 3 and 18 months of age. The results show that early postnatal exposure to CO does not affect the acquisition and reacquisition of an active avoidance task in both adult and aged rats. Conversely, our previous findings indicate that prenatal exposure to CO (75 and 150 ppm), resulting in maternal blood carboxyhaemoglobin concentrations equivalent to those found in human cigarette smokers, induces long-lasting learning and memory deficits. These findings suggest that neurofunctional sequelae of prenatal CO exposure are notably different from those occurring in response to early postnatal exposure and that the vulnerability of the developing brain to prolonged, relatively mild, decrease in oxygen availability induced by CO critically depends on the particular period of developmental exposure.