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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Raphe Pallidus is Not Important to Central Chemoreception in a Rat Model of Parkinson's Disease

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Oliveira, Luiz M. [1] ; Moreira, Thiago S. [2] ; Takakura, Ana C. [1]
Total Authors: 3
[1] Univ Sao Paulo, Inst Biomed Sci, Dept Pharmacol, 1524 Lineu Prestes Ave, BR-05508000 Sao Paulo, SP - Brazil
[2] Univ Sao Paulo, Inst Biomed Sci, Dept Physiol & Biophys, BR-05508000 Sao Paulo, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Neuroscience; v. 369, p. 350-362, JAN 15 2018.
Web of Science Citations: 4

Central chemoreceptors are primarily sensitive to changes in CO2/H+, and such changes lead to intense breathing activity. Medullary raphe and retrotrapezoid nucleus (RTN) neurons are candidates for central chemoreceptors because they are unusually pH sensitive. The pathophysiology of Parkinson's disease (PD) is related to the reduction of neurons in the substantia nigra pars compacta (SNpc) that express dopamine, although other neurons can also be degenerated in this pathology. In rodent models of PD, we showed an impairment of the hypercapnia ventilatory response due to a reduction in the number of RTN chemosensitive neurons. Here, we aimed to investigate if serotonine-expressing neurons in the Raphe pallidus/parapyramidal region (RPa/PPy) are also involved in the modulation of breathing during central chemoreception activation in a PD animal model. PD was induced in male Wistar rats with bilateral injection of 6-OHDA (6-hydroxydopamine; 24 mg/ml) into the striatum, which leads to a reduction in the catecholaminergic neurons of the SNpc by 89%. In PD animals, we noticed a reduction in the number of RPa neurons that project to the RTN, without a change in the number of hypercapnia-activated (7% CO2) raphe neurons. The PD animals that received injection of the toxin saporin anti-SERT into the RPA/PPy region did not show a further reduction of respiratory frequency (f(R)) or ventilation (V-E) at rest or during hypercapnia challenge. These experiments demonstrate that serotonergic neurons of RPa/PPy are not involved in the breathing responses induced by central chemoreceptor activation in a PD animal model. (C) 2017 IBRO. Published by Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 15/23376-1 - Retrotrapezoid nucleus, respiratory chemosensitivity and breathing automaticity
Grantee:Thiago dos Santos Moreira
Support type: Research Projects - Thematic Grants
FAPESP's process: 16/23281-3 - Encephalic regions responsible for neuroplasticity observed in respiratory response induced by hypercapnia in a modelo of Parkinson´s s disease
Grantee:Ana Carolina Thomaz Takakura
Support type: Regular Research Grants
FAPESP's process: 14/22406-1 - Respiratory anatomofunctional changes observed in an experimental model of Parkinson Disease
Grantee:Ana Carolina Thomaz Takakura
Support type: Regular Research Grants
FAPESP's process: 15/18842-3 - Orexinergic and aminergic mechanisms in respiratory control in an animal model of Parkinsons Disease
Grantee:Luiz Marcelo Oliveira Santos
Support type: Scholarships in Brazil - Doctorate