Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\26335642
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Neuron
2015 ; 87
(5
): 946-61
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Neural Control of Breathing and CO2 Homeostasis
#MMPMID26335642
Guyenet PG
; Bayliss DA
Neuron
2015[Sep]; 87
(5
): 946-61
PMID26335642
show ga
Recent advances have clarified how the brain detects CO2 to regulate breathing
(central respiratory chemoreception). These mechanisms are reviewed and their
significance is presented in the general context of CO2/pH homeostasis through
breathing. At rest, respiratory chemoreflexes initiated at peripheral and central
sites mediate rapid stabilization of arterial PCO2 and pH. Specific brainstem
neurons (e.g., retrotrapezoid nucleus, RTN; serotonergic) are activated by PCO2
and stimulate breathing. RTN neurons detect CO2 via intrinsic proton receptors
(TASK-2, GPR4), synaptic input from peripheral chemoreceptors and signals from
astrocytes. Respiratory chemoreflexes are arousal state dependent whereas
chemoreceptor stimulation produces arousal. When abnormal, these interactions
lead to sleep-disordered breathing. During exercise, central command and reflexes
from exercising muscles produce the breathing stimulation required to maintain
arterial PCO2 and pH despite elevated metabolic activity. The neural circuits
underlying central command and muscle afferent control of breathing remain
elusive and represent a fertile area for future investigation.