Transient attenuation of CO sensitivity after neurotoxic lesions in the medullary raphe area of awake goats
Journal of Applied Physiology, ISSN: 8750-7587, Vol: 97, Issue: 6, Page: 2236-2247
2004
- 46Citations
- 24Captures
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Metrics Details
- Citations46
- Citation Indexes46
- 46
- CrossRef38
- Captures24
- Readers24
- 24
Article Description
The major objective of his study was to gain insight into whether under physiological conditions medullary raphe area neurons influence breathing through CO/H chemoreceptors and/or through a postulated, nonchemoreceptor modulatory influence. Microtubules were chronically implanted into the raphe of adult goats (n = 13), and breathing at rest (awake and asleep), breathing during exercise, as well as CO sensitivity were assessed repeatedly before and after sequential injections of the neurotoxins saporin conjugated to substance P [SP-SAP; neurokinin-1 receptor (NK1R) specific] and ibotenic acid (IA; nonspecific glutamate receptor excitotoxin). In all goats, microtubule implantation alone resulted in altered breathing periods, manifested as central or obstructive apneas, and fractionated breathing. The frequency and characteristics of the altered breathing periods were not subsequently affected by injections of the neurotoxins (P > 0.05). Three to seven days after SP-SAP or subsequent IA injection, CO sensitivity was reduced (P < 0.05) by 23.8 and 26.8%, respectively, but CO sensitivity returned to preinjection control values >7 days postinjection. However, there was no hypoventilation at rest (awake, non-rapid eye movement sleep, or rapid eye movement sleep) or during exercise after these injections (P > 0.05). The neurotoxin injections resulted in neuronal death greater than three times that with microtubule implantation alone and reduced (P < 0.05) both tryptophan hydroxylase-expressing (36%) and NK1R-expressing (35%) neurons at the site of injection. We conclude that both NK1R- and glutamate receptor-expressing neurons in the medullary raphe nuclei influence CO sensitivity apparently through CO/H-expressing chemoreception, but the altered breathing periods appear unrelated to CO chemoreception and thus are likely due to non-chemoreceptor-related neuromodulation of ventilatory control mechanisms.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=9244237596&origin=inward; http://dx.doi.org/10.1152/japplphysiol.00584.2004; http://www.ncbi.nlm.nih.gov/pubmed/15322066; https://www.physiology.org/doi/10.1152/japplphysiol.00584.2004; http://jap.physiology.org/cgi/doi/10.1152/japplphysiol.00584.2004; http://jap.physiology.org/content/97/6/2236
American Physiological Society
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