Faculty Opinions recommendation of Comparative analysis of neonatal and adult rat carotid body responses to chronic intermittent hypoxia.

2008 ◽  
Author(s):  
Joseph Frank Cotten
Keyword(s):  
Comparative Analysis ◽  
Carotid Body ◽  
Intermittent Hypoxia ◽  
Chronic Intermittent Hypoxia ◽  
Adult Rat

scholarly journals Comparative analysis of neonatal and adult rat carotid body responses to chronic intermittent hypoxia

2008 ◽  
Vol 104 (5) ◽  
pp. 1287-1294 ◽  
Author(s):  
Anita Pawar ◽  
Ying-Jie Peng ◽  
Frank J. Jacono ◽  
Nanduri R. Prabhakar
Keyword(s):  
Carotid Body ◽  
Intermittent Hypoxia ◽  
Ex Vivo ◽  
Adult Life ◽  
Sensory Response ◽  
Chronic Intermittent Hypoxia ◽  
Adult Rats ◽  
Adult Rat ◽  
Carotid Bodies

Previous studies suggest that carotid body responses to long-term changes in environmental oxygen differ between neonates and adults. In the present study we tested the hypothesis that the effects of chronic intermittent hypoxia (CIH) on the carotid body differ between neonates and adult rats. Experiments were performed on neonatal (1–10 days) and adult (6–8 wk) males exposed either to CIH (9 episodes/h; 8 h/day) or to normoxia. Sensory activity was recorded from ex vivo carotid bodies. CIH augmented the hypoxic sensory response (HSR) in both groups. The magnitude of CIH-evoked hypoxic sensitization was significantly greater in neonates than in adults. Seventy-two episodes of CIH were sufficient to evoke hypoxic sensitization in neonates, whereas as many as 720 CIH episodes were required in adults, suggesting that neonatal carotid bodies are more sensitive to CIH than adult carotid bodies. CIH-induced hypoxic sensitization was reversed in adult rats after reexposure to 10 days of normoxia, whereas the effects of neonatal CIH persisted into adult life (2 mo). Acute intermittent hypoxia (IH) evoked sensory long-term facilitation of the carotid body activity (sensory LTF, i.e., increased baseline neural activity following acute IH) in CIH-exposed adults but not in neonates. The effects of CIH were associated with hyperplasia of glomus cells in neonatal but not in adult carotid bodies. These observations demonstrate that responses to CIH differ between neonates and adults with regard to the magnitude of sensitization of HSR, susceptibility to CIH, induction of sensory LTF, reversibility of the responses, and morphological remodeling of the chemoreceptor tissue.

scholarly journals NADPH Oxidase Is Required for the Sensory Plasticity of the Carotid Body by Chronic Intermittent Hypoxia

2009 ◽  
Vol 29 (15) ◽  
pp. 4903-4910 ◽  
Author(s):  
Y.- J. Peng ◽  
J. Nanduri ◽  
G. Yuan ◽  
N. Wang ◽  
E. Deneris ◽  
...  
Keyword(s):  
Nadph Oxidase ◽  
Carotid Body ◽  
Intermittent Hypoxia ◽  
Chronic Intermittent Hypoxia ◽  
Sensory Plasticity

scholarly journals Chronic intermittent hypoxia induces hypoxic sensitivity in adult rat adrenal medulla via oxidative stress

2006 ◽  
Vol 20 (4) ◽  
Author(s):  
Ganesh K Kumar ◽  
Vandana Rai ◽  
Suresh Sharma ◽  
DeviPrasadh Ramakrishnan ◽  
Ying‐Jie Peng ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Adrenal Medulla ◽  
Intermittent Hypoxia ◽  
Chronic Intermittent Hypoxia ◽  
Adult Rat

scholarly journals Chronic intermittent hypoxia induces hypoxia-evoked catecholamine efflux in adult rat adrenal medulla via oxidative stress

2006 ◽  
Vol 575 (1) ◽  
pp. 229-239 ◽  
Author(s):  
Ganesh K. Kumar ◽  
Vandana Rai ◽  
Suresh D. Sharma ◽  
Devi Prasadh Ramakrishnan ◽  
Ying-Jie Peng ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Adrenal Medulla ◽  
Intermittent Hypoxia ◽  
Chronic Intermittent Hypoxia ◽  
Adult Rat
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