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Acute and chronic effects of carotid body denervation on ventilation and chemoreflexes in three rat strains. J Physiol 2012 Jul 15;590(14):3335-47

Date

05/23/2012

Pubmed ID

22615434

Pubmed Central ID

PMC3459046

DOI

10.1113/jphysiol.2012.234658

Scopus ID

2-s2.0-84864114827   28 Citations

Abstract

Brown Norway (BN) rats have a relatively specific deficit in CO2 sensitivity. This deficit could be due to an abnormally weak carotid body contribution to CO2 sensitivity. Accordingly, we tested the hypothesis that CBD would have less of an effect on eupnoeic breathing and CO2 sensitivity in the BN rats compared to other rat strains.We measured ventilation and blood gases at rest (eupnoea) and during hypoxia (FIO2 =0.12) or hypercapnia (FICO2 =0.07) before and up to 23 days after bilateral or Sham CBD in BN, Sprague–Dawley (SD) and Dahl Salt-Sensitive (SS) rats. In all three rat strains, CBD elicited eupnoeic hypoventilation (PaCO2 +8.7–11.0 mmHg) 1–2 days post-CBD (P <0.05), and attenuated ventilatory responses to hypoxia (P <0.05) and venous sodium cyanide (NaCN; P<0.05), while sham CBD had no effect on resting breathing, blood gases or chemoreflexes (P >0.05). In contrast, CBD had no effect on CO2 sensitivity (˙VE/PaCO2) in all strains (P>0.05). Eupnoeic PaCO2 returned to pre-CBD values within 15–23 days post-CBD. Thus, the effects of CBD in rats (1) further support an important role for the carotid bodies in eupnoeic blood gas regulation, (2) suggest that the carotid bodies are not a major determinant of CO2 sensitivity in rats, and (3) may not support the concept of an interaction among the peripheral and central chemoreceptors in rats.

Author List

Mouradian GC, Forster HV, Hodges MR

Authors

Hubert V. Forster PhD Professor in the Physiology department at Medical College of Wisconsin
Matthew R. Hodges PhD Associate Professor in the Physiology department at Medical College of Wisconsin
Gary C. Mouradian PhD Instructor in the Physiology department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Animals
Carbon Dioxide
Carotid Body
Denervation
Hypercapnia
Hypoxia
Male
Oxygen
Pulmonary Ventilation
Rats
Rats, Inbred BN
Rats, Inbred Dahl
Rats, Sprague-Dawley
Reflex
Species Specificity
jenkins-FCD Prod-411 e00897e83867fcfa48419861683711f8d99adb75