Integration of the Proprioceptive and Central Inspiratory Inhibitory Afferent Inputs by Pontine Noradrenergic A5 Neurons in Rats
- Authors: Tatarnikov V.S.1, Shirolapov I.V.1, Glazkova E.N.1, Pyatin V.F.1
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Affiliations:
- Department of Physiology Samara State Medical University, Ministry of Health of the Russian Federation
- Issue: Vol 165, No 2 (2018)
- Pages: 184-188
- Section: Article
- URL: https://journals.rcsi.science/0007-4888/article/view/240151
- DOI: https://doi.org/10.1007/s10517-018-4126-6
- ID: 240151
Cite item
Abstract
Inhibitory afferent inputs to pontine A5 noradrenergic neurons (A5 NN) are not known, except partial baroreceptor input. In spontaneously breathing pentobarbital-anesthetized rats, we registered 35 A5 NN that were activated by hypoxia (100% N2, 10 sec) by more than 5 times in comparison with the background. Cooling of retrotrapezoid nucleus (15°C, 6 sec) completely blocked the motor inspiratory output and A5 NN discharge frequency increased (23/23) by more than 7 times in comparison with the background values. The beginning of A5 NN activation coincided with cessation of inspiratory activity. Short-term passive stretching of the shin muscles (1 sec, 100 g) caused BP drop and complete inhibition of A5 NN (12/12) activated by hypoxia. Inhibitory afferent inputs from proprioceptors and central inspiratory neurons that can limit A5 NN activity were demonstrated.
About the authors
V. S. Tatarnikov
Department of Physiology Samara State Medical University, Ministry of Health of the Russian Federation
Author for correspondence.
Email: tatarnikov_vs@mail.ru
Russian Federation, Samara
I. V. Shirolapov
Department of Physiology Samara State Medical University, Ministry of Health of the Russian Federation
Email: tatarnikov_vs@mail.ru
Russian Federation, Samara
E. N. Glazkova
Department of Physiology Samara State Medical University, Ministry of Health of the Russian Federation
Email: tatarnikov_vs@mail.ru
Russian Federation, Samara
V. F. Pyatin
Department of Physiology Samara State Medical University, Ministry of Health of the Russian Federation
Email: tatarnikov_vs@mail.ru
Russian Federation, Samara
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