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Glucocorticoid programing of the mesopontine cholinergic system
Sónia Borges1, Bárbara Coimbra1, Carina Soares-Cunha1
1Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho , Braga , Portugal ; ICVS/3B's - PT Government Associate Laboratory , Braga/Guimarães , Portugal.
Prenatal exposure to glucocorticoids (GCs) alters brain pathways, increasing anxiety and fear responses. This study reveals specific cholinergic pathway programming by GCs, impacting stress vulnerability.
Area of Science:
- Neuroscience
- Endocrinology
- Behavioral Biology
Background:
- Early life stress significantly modulates neuroendocrine systems, influencing long-term stress susceptibility and emotional dysfunction.
- Prenatal exposure to glucocorticoids (GCs) programs offspring for heightened anxiety, fear, and reactivity to negative stimuli.
Purpose of the Study:
- To investigate how early life experiences, specifically in utero glucocorticoid exposure (iuGC), alter the processing of negative stimuli and emotional regulation.
- To examine the role of the mesopontine tegmentum cholinergic pathway in mediating the effects of prenatal GC exposure on emotional behavior.
Main Methods:
- Assessment of behavioral responses, including fear and anxiety, in animals prenatally exposed to GCs (iuGC).
- Quantification of aversive 22 kHz ultrasonic vocalizations as an indicator of negative emotional states.
- Evaluation of choline acetyltransferase (ChAT) expression and cholinergic activation patterns in the laterodorsal tegmental nucleus (LDT) and pedunculopontine tegmental nucleus (PPT).
Main Results:
- iuGC animals exhibited increased anxiety, fear behavior, and hyper-reactivity to negative stimuli, alongside a rise in 22 kHz ultrasonic vocalizations.
- A basal increase in choline acetyltransferase (ChAT) expression was observed in the LDT and PPT of iuGC animals.
- Marked alterations in the cholinergic activation patterns of the LDT and PPT were found in iuGC animals, correlating with their amplified responses to adverse stimuli.
Conclusions:
- Prenatal GC exposure specifically programs the mesopontine tegmentum cholinergic pathway (LDT and PPT).
- This specific cholinergic pathway programming may be a key mechanism underlying individual differences in stress vulnerability thresholds.
- Findings suggest a link between prenatal GC exposure, cholinergic system alterations, and the development of stress-related emotional disorders.
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