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Integration between rostroventrolateral medulla and paraventricular nucleus during arterial chemoreceptor activation: possible involvement of catecholaminergic mechanisms

Grant number: 13/00401-5
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): March 01, 2014
Effective date (End): March 31, 2016
Field of knowledge:Biological Sciences - Physiology
Principal Investigator:Thiago dos Santos Moreira
Grantee:Talita de Melo e Silva
Home Institution: Instituto de Ciências Biomédicas (ICB). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

In response to a reduction in the partial pressure of O2 (PaO2), peripheral chemoreceptors detect these changes and send information to the CNS in order to elicit brain mobilization to correct the change in homeostasis. Thus, the peripheral chemoreflex is a main element maintainers of cardiorespiratory homeostasis.Information from peripheral chemoreceptors can be distributed to different areas of the CNS, including areas located in the ventrolateral region of the medulla oblongata involved in sympathetic and respiratory control. Under resting conditions, the sympathetic premotor neurons in the ventrolateral medulla are the primary source of sympathetic activity, 70% of these neurons synthesize adrenaline and belong by definition to the C1 neurons. These catecholaminergic projections can promote the activation of hypothalamic neurons, particularly the paraventricular nucleus of the hypothalamus (PVN). Parvocellular neurons of the PVN are involved in cardiovascular control through the innervation of other brain structures involved in the control of sympathetic activity, including the NTS, the catecholaminergic C1 neurons and spinal cord. Studies show that aversive situations are able to promote the production of vasopressin, oxytocin and corticotrophin releasing factor (CRF). From this evidence, it is important to assess whether activation of the peripheral chemoreflex (another important aversive stimulus) activates catecholaminergic neurons located in the ventrolateral medulla which in turn influence the control of the activity of neurons located in the PVN.Moreover, there is evidence of the involvement of an inflammatory process in front of a chronic intermittent hypoxia. Our hypothesis is that hypoxia maintained (3 hours) would be promoting the release of pro-inflammatory factors such as interleukins (IL-1² and IL-6), tumor necrosis factor (TNF ±), which would be essential to promote the activation of the brain pathway C1- PVN.The experiments outlined in this project seek to test these hypotheses and will be performed by anatomical, optogenetic and molecular biology techniques.

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SILVA, TALITA M.; CHAAR, LAIALI J.; SILVA, REINALDO C.; TAKAKURA, ANA C.; CAMARA, NIELS O.; ANTUNES, VAGNER R.; MOREIRA, THIAGO S. Minocycline alters expression of inflammatory markers in autonomic brain areas and ventilatory responses induced by acute hypoxia. Experimental Physiology, v. 103, n. 6, p. 884-895, JUN 1 2018. Web of Science Citations: 5.
SILVA, TALITA M.; TAKAKURA, ANA C.; MOREIRA, THIAGO S. Acute hypoxia activates hypothalamic paraventricular nucleus-projecting catecholaminergic neurons in the C1 region. Experimental Neurology, v. 285, n. A, p. 1-11, NOV 2016. Web of Science Citations: 9.
SILVA, JOSIANE N.; LUCENA, ELVIS V.; SILVA, TALITA M.; DAMASCENO, ROSELIA S.; TAKAKURA, ANA C.; MOREIRA, THIAGO S. INHIBITION OF THE PONTINE KOLLIKER-FUSE NUCLEUS REDUCES GENIOGLOSSAL ACTIVITY ELICITED BY STIMULATION OF THE RETROTRAPEZOID CHEMORECEPTOR NEURONS. Neuroscience, v. 328, p. 9-21, JUL 22 2016. Web of Science Citations: 8.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)

Please report errors in scientific publications list by writing to: cdi@fapesp.br.