Document Detail


Acute and chronic effects of carotid body denervation on ventilation and chemoreflexes in three rat strains.
MedLine Citation:
PMID:  22615434     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Gary C Mouradian; Hubert V Forster; Matthew R Hodges
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2012-05-21
Journal Detail:
Title:  The Journal of physiology     Volume:  590     ISSN:  1469-7793     ISO Abbreviation:  J. Physiol. (Lond.)     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-07-24     Completed Date:  2012-11-30     Revised Date:  2014-05-12    
Medline Journal Info:
Nlm Unique ID:  0266262     Medline TA:  J Physiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  3335-47     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Anoxia / physiopathology
Carbon Dioxide / blood
Carotid Body / physiology*,  surgery
Denervation
Hypercapnia / physiopathology
Male
Oxygen / blood
Pulmonary Ventilation / physiology*
Rats
Rats, Inbred BN
Rats, Inbred Dahl
Rats, Sprague-Dawley
Reflex / physiology*
Species Specificity
Grant Support
ID/Acronym/Agency:
HL097033/HL/NHLBI NIH HHS; R00 HL097033/HL/NHLBI NIH HHS; T32 HL007852/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
142M471B3J/Carbon Dioxide; S88TT14065/Oxygen
Comments/Corrections

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