GABAergic modulation of ventilation and peak oxygen consumption in obese Zucker rats.
GABAergic modulation of ventilation and peak oxygen consumption in obese Zucker rats.
复制标题
GABAergic 对肥胖 Zucker 大鼠通气和峰值耗氧量的调节。
DOI:
10.1152/jappl.2001.90.5.1707
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发表时间:
2001
期刊:
影响因子:
--
通讯作者:
Farkas,GA
中科院分区:
文献类型:
--
作者:
Lee,SD;Nakano,H;Farkas,GA
Obesity is often associated with a reduced ventilatory response and a decreased maximal exercise capacity. GABA is a major inhibitory neurotransmitter in the mammalian central nervous system. Altered GABAergic mechanisms have been detected in obese Zucker rats and implicated in their hyperphagic response. Whether altered GABAergic mechanisms also contribute to regulate ventilation and influence exercise capacity in obese Zucker rats is unknown and formed the basis of the present study. Eight lean [317 ± 18 (SD) g] and eight obese (450 ± 27 g) Zucker rats were studied at 12 wk of age. Ventilation at rest and ventilation during hypoxic (10% O2) and hypercapnic (4% CO2) challenges were measured by the barometric method. Peak O2consumption (V˙o2 peak) in response to a progressive treadmill test to exhaustion was measured in a metabolic treadmill. Ventilation and V˙o2 peakwere assessed after administration of equal volumes of DMSO (vehicle) and the GABAAreceptor antagonist bicuculline (1 mg/kg). In lean animals, bicuculline administration had no effect on ventilation andV˙o2 peak. In obese rats, bicuculline administration significantly (P< 0.05) increased resting ventilation (465 ± 53 and 542 ± 72 ml · kg−1· min−1for control and bicuculline, respectively), ventilation during exposure to hypoxia (899 ± 148 and 1,038 ± 83 ml · kg−1· min−1for control and bicuculline, respectively), andV˙o2 peak(62 ± 3.7 and 67 ± 3.5 ml · kg−0.75· min−1for control and bicuculline, respectively). However, in obese Zucker rats, ventilation in response to hypercapnia did not change after bicuculline administration (608 ± 96 vs. 580 ± 69 ml · kg−1· min−1). Our findings indicate that endogenous GABA depresses ventilation and limits exercise performance in obese Zucker rats.
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DOI:
10.1164/ajrccm.162.3.9909058
发表时间:
2000
期刊:
American journal of respiratory and critical care medicine.
影响因子:
--
作者:
Lee,SD;Nakano,H;Gosselin,LE;Krasney,JA;Schlenker,EH;Farkas,GA
通讯作者:
Farkas,GA
DOI:
10.1164/ajrccm.150.2.8049815
发表时间:
1994-08-01
影响因子:
24.7
作者:
FARKAS, GA;SCHLENKER, EH
通讯作者:
SCHLENKER, EH
DOI:
10.1152/jappl.1984.56.4.849
发表时间:
1984
期刊:
Journal of applied physiology: respiratory, environmental and exercise physiology
影响因子:
--
作者:
J. Hedner;T. Hedner;P. Wessberg;J. Jonason
通讯作者:
J. Jonason
影响因子:
3.8
作者:
J. Overton;Michael W. Redding;S. L. Yancey;R. Stremel
通讯作者:
R. Stremel
影响因子:
3.3
作者:
Jian Huang;C. Suguihara;D. Hehre;Jing Lin;Eduardo Bancalari
通讯作者:
Eduardo Bancalari