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• W2023657445 abstract "Abstract Background Human epidemiological data suggest a link between anesthesia exposure in early postnatal life and subsequent lasting neurocognitive alterations. Understanding the underlying mechanisms of this potential association is of paramount importance in an attempt to develop protective strategies. While general anesthetics are powerful modulators of GABAergic neurotransmission, little is known about the impact of these drugs on developing GABAergic networks. Here we addressed this issue by evaluating the impact of a 6‐h‐long midazolam exposure on the development of calbindin‐, calretinin‐ and parvalbumin‐expressing GABAergic interneurons. Methods Physiological expression patterns of calbindin‐, calretinin‐, and parvalbumin‐positive neurons as well as the impact of a 6‐h‐long midazolam exposure on these cell populations were evaluated in the medial prefrontal cortex of Wistar rats at defined stages of the brain growth spurt using stereological analysis. Activated caspase‐3 immunohistochemistry was used to quantify apoptotic death in controls and midazolam‐treated subjects. Results In control animals, the number of parvalbumin expressing cells significantly ( p < 0.01) increased while those of calbindin positive populations significantly ( p < 0.01) decreased between postnatal day 10 and 20. Expression of calretinin remained constant during this period. Immediately following exposure, midazolam induced neuroapoptosis at both early (postnatal day 5, p = 0.016) and later (postnatal day 15, p = 0.025) stages of brain development. While this did not diminish overall neuronal density in the medial prefrontal cortex, exposure at P5 led to a subsequent increase in the number of parvalbumin positive neurons in lower cortical layers, and midazolam administration at P15 increased the number of both parvalbumin and calretinin expressing neurons 5 days following exposure. Conclusion These observations demonstrate that midazolam exposure can impair the physiological differentiation patterns of GABAergic interneurons during the brain growth spurt. Considering the important role of GABAergic networks in neuronal physiology, these data provide us with one potential mechanism that could account for the lasting neurobehavioral and cognitive deficits observed in the context of anesthesia exposure in the early postnatal period." @default.
• W2023657445 created "2016-06-24" @default.
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• W2023657445 date "2015-04-18" @default.
• W2023657445 modified "2023-09-27" @default.
• W2023657445 title "Developmental stage‐dependent impact of midazolam on calbindin, calretinin and parvalbumin expression in the immature rat medial prefrontal cortex during the brain growth spurt" @default.
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• W2023657445 doi "https://doi.org/10.1016/j.ijdevneu.2015.04.002" @default.
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