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Department of 1 Physiology and Biophysics and 2 Medicine, School of Medicine, Case Western Reserve University, Cleveland, Ohio 44106
In the present study, the role
of nitric oxide (NO) generated by endothelial nitric oxide synthase
(NOS-3) in the control of respiration during hypoxia and hypercapnia
was assessed using mutant mice deficient in NOS-3.
Experiments were performed on awake and anesthetized mutant and
wild-type (WT) control mice. Respiratory responses to 100, 21, and 12%
O2 and 3 and 5% CO2-balance O2
were analyzed. In awake animals, respiration was monitored by body
plethysmography along with O2 consumption
(
O2) and
CO2 production
(
CO2). In anesthetized,
spontaneously breathing mice, integrated efferent phrenic nerve
activity was monitored as an index of neural respiration along with
arterial blood pressure and blood gases. Under both experimental
conditions, WT mice responded with greater increases in respiration
during 12% O2 than mutant mice. Respiratory responses to
hyperoxic hypercapnia were comparable between both groups of mice.
Arterial blood gases, changes in blood pressure,
O2, and
CO2 during hypoxia were
comparable between both groups of mice. Respiratory responses to
cyanide and brief hyperoxia were attenuated in mutant compared with WT mice, indicating reduced peripheral chemoreceptor sensitivity. cGMP
levels in the brain stem during 12% O2, taken as an index of NO production, were greater in mutant compared with WT mice. These
observations demonstrate that NOS-3 mutant mice exhibit selective
blunting of the respiratory responses to hypoxia but not to
hypercapnia, which in part is due to reduced peripheral chemosensitivity. These results support the idea that NO generated by
NOS-3 is an important physiological modulator of respiration during hypoxia.
nitric oxide; nitric oxide synthase enzyme; nitric oxide synthase deficiency; carotid body
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