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• W2077273756 abstract "Substance P (SP) has been implicated in vagal control of heart rate and cardiac functions, but the mechanisms of SP actions on cardiac vagal activity remain obscure. The present study has investigated the effects of SP on the synaptic inputs of preganglionic cardiovagal motoneurons (CVNs) in brainstem slices of neonatal rat. Whole-cell voltage-clamp recordings were performed on retrogradely labeled CVNs in the nucleus ambiguus. The results show that in thin slices (400 microm thickness) without respiratory-like rhythm, globally applied SP (1 microM) significantly enhanced both the GABAergic and the glycinergic inputs, but had no effect on the glutamatergic inputs, of CVNs. Since inspiratory-related augmentation of the inhibitory inputs of CVNs in individual respiratory cycles is known to play an important role in the genesis of respiratory sinus arrhythmia, the effects of SP on the inhibitory inputs of CVNs were further examined in thick slices (500-800 microm thickness) with respiratory-like rhythm, and SP (1 microM) was focally applied to the CVNs under patch-clamp recording. Focally applied SP caused frequency increases of the GABAergic and the glycinergic inputs both during inspiratory bursts and during inspiratory intervals. However, the inspiratory-related augmentation of the GABAergic and the glycinergic inputs of CVNs, measured by the frequency increases during inspiratory bursts in percentage of the frequency during inspiratory intervals, was significantly decreased by SP. These results suggest that SP inhibits CVNs via enhancement of their inhibitory synaptic inputs, and SP diminishes the respiratory-related fluctuation of cardiac vagal activity in individual respiratory cycles. These results also indicate that SP may play a role in altering the vagal control of the heart in some cardiovascular diseases such as myocardial ischemia and hypertension, since these diseases are characterized by weakened cardiac vagal tone and heart rate variability, and have been found to have increased central release and receptor binding of SP." @default.
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• W2077273756 date "2009-08-01" @default.
• W2077273756 modified "2023-09-23" @default.
• W2077273756 title "Presynaptic modulation of tonic and respiratory inputs to cardiovagal motoneurons by substance P" @default.
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• W2077273756 doi "https://doi.org/10.1016/j.brainres.2009.05.056" @default.
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