Adenosine in the lateral hypothalamus/perifornical area does not participate on the CO2 chemoreflex

Author(s)

Cabral Rodrigues, Laisa Tais ^[1] ; Salata, Bruno ^[1] ; Horta-Junior, Jose de Anchieta C. ^[2] ; Gargaglioni, Luciane H. ^[3] ; Dias, Mirela Barros ^[1]

Affiliation

^[1] Sao Paulo State Univ, Inst Biosci, Dept Physiol, UNESP, Botucatu, SP - Brazil

^[2] Sao Paulo State Univ, Inst Biosci, Dept Anat, UNESP, Botucatu, SP - Brazil

^[3] Sao Paulo State Univ, Dept Anim Morphol & Physiol, FCAV, Jaboticabal, SP - Brazil

• Document type: Journal article
• Source: Respiratory Physiology & Neurobiology; v. 276, MAY 2020.
• Web of Science Citations: 0

Abstract

The Lateral Hypothalamus/Perifornical Area (LH/PFA) has been shown to be involved with the hypercapnic ventilatory response, in a state-dependent manner. We have demonstrated that purinergic signaling through ATP in the LH/PFA has an excitatory effect in ventilatory response to CO2 in awake rats in the dark phase of the diurnal cycle, but it is unknown whether the ATP metabolite adenosine, acting in the LH/PFA, modulates the ventilatory responses to hypercapnia. Here, we studied the effects of the microdialysis of adenosine (A1/A2 adenosine receptors agonist; 17 mM) and an A1 receptor antagonist (DPCPX; 0.1 mM) into the LH/PFA of conscious rats on ventilation in room air and in 7% CO2 during the light and the dark phases of the diurnal cycle. The microdialysis of adenosine and DPCPX caused no change in the CO2 ventilatory responses of rats during wakefulness or NREM sleep in either the dark or light period. Our data suggest that adenosine in the LH/PFA does not contribute to the hypercapnic ventilatory response in conscious rats. (AU)

• FAPESP's process: 16/13136-6 - The effect of metabolic programming by caloric restriction in areas of central nervous system of Wistar rats involved with feeding behavior: the solitary tract nucleus and the lateral hypothalamic area
• Grantee: José de Anchieta de Castro e Horta Júnior
• Support type: Regular Research Grants
• FAPESP's process: 17/02181-3 - Role of adenosine and A1 receptors in the lateral hypothalamus and perifornical area (LHA / PFA) in daily variations of the hypercapnic ventilatory response
• Grantee: Laísa Taís Cabral Rodrigues Xavier
• Support type: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 13/04216-8 - Neural mechanisms involved in the diurnal variation of the central chemoreflex control
• Grantee: Mirela Barros Dias
• Support type: Research Grants - Young Investigators Grants