Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Pivot Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Target Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Query: UMLS:C0242706 (
hyperoxia
)
5,219
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
Chronic postnatal
hyperoxia
blunts the hypoxic ventilatory response (HVR) in rats, an effect that persists for months after return to normoxia. To determine whether decreased carotid body O(2) sensitivity contributes to this lasting impairment, single-unit chemoafferent nerve and glomus cell calcium responses to hypoxia were recorded from rats reared in 60% O(2) through 7d of age (P7) and then returned to normoxia. Single-unit nerve responses were attenuated by P4 and remained low through P7. After return to normoxia, hypoxic responses were partially recovered within 3d and fully recovered within 7-8d (i.e., at P14-15). Glomus cell calcium responses recovered with a similar time course.
Hyperoxia
altered carotid body mRNA expression for O(2)-sensitive K(+) channels TASK-1,
TASK-3
, and BK(Ca), but only TASK-1 mRNA paralleled changes in chemosensitivity (i.e., downregulation by P7, partial recovery by P14). Collectively, these data do not support a role for reduced O(2) sensitivity of individual chemoreceptor cells in long-lasting reduction of the HVR after developmental
hyperoxia
.
...
PMID:Recovery of carotid body O2 sensitivity following chronic postnatal hyperoxia in rats. 2142 May 11
Previous work demonstrated that
hyperoxia
(30-60% O(2)) exposure in the post-natal period reduces the ventilatory response to acute hypoxia and this impairment may continue considerably beyond the period of
hyperoxia
exposure. Previous work from our laboratory demonstrated that 1-2 weeks of
hyperoxia
(60% O(2)) starting between P1 and P14: reduced the single chemoreceptor unit response to hypoxia, reduced the rise in glomus cell calcium caused by acute hypoxia and reduced hypoxia-induced catecholamine release (Donnelly 05, Donnelly 09). The present study asked whether the impairment extended to hypoxia-induced membrane depolarization, an earlier step in the transduction cascade. Perforated patch, whole-cell recordings were obtained from rat glomus cells exposed to
hyperoxia
from P0-P8 or P8-P15 and age-matched control groups. In both cases, hypoxia-induced membrane depolarization was significantly less in the
hyperoxia
treated groups compared to controls, while depolarization to 20 mM K(+) was not significantly affected. Resting membrane potential and input resistance were also not different in the
hyperoxia
treated groups. Whole carotid body quantitative real time PCR showed that TASK-1,
TASK-3
and L-type Ca(2+) channel expression was significantly down-regulated at Hyper 8-15 compared to controls. We conclude that 1 week of postnatal
hyperoxia
during the early and late stage of CB maturation impairs organ function by affecting the coupling between hypoxia and glomus cell depolarization. This may be caused by altered expression of TASK1,
TASK3
or L-type Ca(2+) channel gene expression. We speculate that an identification of cellular changes caused by
hyperoxia
may yield unique insights to the mechanism of oxygen sensing by the carotid bodies.
...
PMID:Postnatal hyperoxia impairs acute oxygen sensing of rat glomus cells by reduced membrane depolarization. 2308 Jan 42
Despite intensive research, the exact function of TASK potassium channels in central and peripheral chemoreception is still under debate. In this study, we investigated the respiration of unrestrained
TASK-3
(
TASK-3
-/-
) and TASK-1/
TASK-3
double knockout (TASK-1/3
-/-
) adult male mice in vivo using a plethysmographic device. Ventilation parameters of
TASK-3
-/-
mice were normal under control condition (21% O
2
) and upon hypoxia and hypercapnia they displayed the physiological increase of ventilation. TASK-1/3
-/-
mice showed increased ventilation under control conditions. This increase of ventilation was caused by increased tidal volumes (V
T
), a phenomenon similarly observed in TASK-1
-/-
mice. Under acute hypoxia, TASK-1/3
-/-
mice displayed the physiological increase of the minute volume. Interestingly, this increase was not related to an increase of the respiratory frequency (f
R
), as observed in wild-type mice, but was caused by a strong increase of V
T
. This particular respiratory phenotype is reminiscent of the respiratory phenotype of carotid body-denervated rodents in the compensated state. Acute hypercapnia (5% CO
2
) stimulated ventilation in TASK-1/3
-/-
and wild-type mice to a similar extent; however, at higher CO
2
concentrations (>5% CO
2
) the stimulation of ventilation was more pronounced in TASK-1/3
-/-
mice. At
hyperoxia
(100% O
2
), TASK-1
-/-
,
TASK-3
-/-
and wild-type mice showed the physiological small decrease of ventilation. In sharp contrast, TASK-1/3
-/-
mice exhibited an abnormal increase of ventilation under
hyperoxia
. In summary, these measurements showed a grossly normal respiration of
TASK-3
-/-
mice and a respiratory phenotype of TASK-1/3
-/-
mice that was characterized by a markedly enhanced tidal volume, similar to the one observed in TASK-1
-/-
mice. The abnormal
hyperoxia
response, exclusively found in TASK-1/3
-/-
double mutant mice, indicates that both TASK-1 and
TASK-3
are essential for the
hyperoxia
-induced hypoventilation. The peculiar respiratory phenotype of TASK-1/3 knockout mice is reminiscent of the respiration of animals with long-term carotid body dysfunction. Taken together, TASK-1 and
TASK-3
appear to serve specific and distinct roles in the complex processes underlying chemoreception and respiratory control.
...
PMID:Abnormal respiration under hyperoxia in TASK-1/3 potassium channel double knockout mice. 2867 76
