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• W2894726421 endingPage "18.2018" @default.
• W2894726421 startingPage "ENEURO.0264" @default.
• W2894726421 abstract "In central respiratory circuitry, synaptic excitation is responsible for synchronizing neuronal activity in the different respiratory rhythm phases, whereas chloride-mediated inhibition is important for shaping the respiratory pattern itself. The potassium chloride cotransporter KCC2, which serves to maintain low intraneuronal Cl- concentration and thus render chloride-mediated synaptic signaling inhibitory, exists in two isoforms, KCC2a and KCC2b. KCC2 is essential for functional breathing motor control at birth, but the specific contribution of the KCC2a isoform remains unknown. Here, to address this issue, we investigated the respiratory phenotype of mice deficient for KCC2a. In vivo plethysmographic recordings revealed that KCC2a-deficient pups at P0 transiently express an abnormally low breathing rate and a high occurrence of apneas. Immunostainings confirmed that KCC2a is normally expressed in the brainstem neuronal groups involved in breathing (pre-Bötzinger complex, parafacial respiratory group, hypoglossus nucleus) and is absent in these regions in the KCC2a-/- mutant. However, in variously reduced in vitro medullary preparations, spontaneous rhythmic respiratory activity is similar to that expressed in wild-type preparations, as is hypoglossal motor output, and no respiratory pauses are detected, suggesting that the rhythm-generating networks are not intrinsically affected in mutants at P0. In contrast, inhibitory neuromodulatory influences exerted by the pons on respiratory rhythmogenesis are stronger in the mutant, thereby explaining the breathing anomalies observed in vivo. Thus, our results indicate that the KCC2a isoform is important for establishing proper breathing behavior at the time of birth, but by acting at sites that are extrinsic to the central respiratory networks themselves." @default.
• W2894726421 created "2018-10-12" @default.
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• W2894726421 date "2018-09-01" @default.
• W2894726421 modified "2023-10-10" @default.
• W2894726421 title "Role of the K⁺-Cl^– Cotransporter KCC2a Isoform in Mammalian Respiration at Birth" @default.
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• W2894726421 doi "https://doi.org/10.1523/eneuro.0264-18.2018" @default.
• W2894726421 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6220586" @default.
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