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Involvement of nitric oxide in regulation of the medullary respiratory rhythm in neonatal rats

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Volgin D., Volgina A., Seredenko M.
Acta Neurobiologiae Experimentalis
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2000
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vol. 60
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issue 2
175-186
EN
The NADPH-diaphorase (as a neuronal NO-synthase) reactivity in the medullary structures of the respiratory rhythm (RR) generator and the role of NO in the regulation of respiratory activity in the phrenic nerve of artificially superfused semi-isolated medulla-spinal cord preparations were investigated in newborn rats. NADPH-diaphorase positive neurons were found in all nuclei of both dorsal and ventral respiratory groups of neurons. The maximal density of stained cells was present within the rostral part of the ventrolateral medulla (VLM), in the region of the lateral paragigantocellular reticular nucleus. It was found that endogenous NO mediates the mechanism of tonic inhibitory control of the RR frequency located in the rostral VLM under normal and hypoxic conditions, and appears to be involved in generation of the basic RR by the more caudal structures of VLM. It was shown that NO biosynthesis mediates the effect of NMDA receptors activation on the RR.
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Changes in the central respiratory rhythm following pharmacological blockade of the nucleus parabrachialis medialis in the rabbit

100%
Gromysz K.
Acta Neurobiologiae Experimentalis
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1997
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vol. 57
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issue 4
339-343
EN
Experiments were performed in halothane anesthetized, paralyzed, bilaterally vagotomized and artificially ventilated rabbits. Arterial blood pressure, expiratory carbon dioxide concentration, and electrical activity of the right phrenic nerve were recorded prior to and after xylocaine microinjection to the left nucleus parabrachialis medialis (NPBM). The location of the xylocaine blockade was verified histologically. It was found that blockade of the NPBM results in a decelerated respiratory rhythm due to lengthening of both phases of the respiratory cycle. These results do not corroborate the role of NPBM in the regulation of respiration as postulated by Bertrand and Hugelin (1971). ugelin (
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