GABAergic modulation of ventilation and peak oxygen consumption in obese Zucker rats.

GABAergic modulation of ventilation and peak oxygen consumption in obese Zucker rats.
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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:
Journal of applied physiology (Bethesda, Md. : 1985)
影响因子:
--
通讯作者:
Farkas,GA
Farkas,GA
中科院分区:
--
文献类型:
--
作者:
Lee,SD;Nakano,H;Farkas,GA

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肥胖通常与减少的运动反应和减少的最大运动能力有关。GABA是哺乳动物中枢神经系统中的主要抑制性神经递质。已在肥胖Zucker大鼠中检测到改变的GABA能机制,并与其摄食反应有关。改变的GABA能机制是否也有助于调节肥胖Zucker大鼠的通气和影响运动能力尚不清楚,这是本研究的基础。在12周龄时研究了8只瘦[317 ± 18(SD)g]和8只肥胖(450 ± 27 g)Zucker大鼠。通过气压法测量静息通气量和低氧(10%O2)和高碳酸(4%CO2)挑战期间的通气量。在代谢跑台上测量了对渐进式跑台试验至力竭的最大耗氧量(Vsteco 2 peak)。在给予等体积的DMSO(载体)和GABA A受体拮抗剂荷包牡丹碱(1 mg/kg)后评估通气和Vsteco 2峰。在瘦动物中,荷包牡丹碱给药对通气和Vsteco 2峰值没有影响。在肥胖大鼠中,荷包牡丹碱给药显著(P< 0.05)增加静息通气量(对照组和荷包牡丹碱组分别为465 ± 53和542 ± 72 ml · kg-1· min-1),缺氧暴露期间通气(对照组和荷包牡丹碱组分别为899 ± 148和1,038 ± 83 ml · kg-1· min-1)和Vsteco 2峰值(对照组和荷包牡丹碱组分别为62 ± 3.7和67 ± 3.5 ml · kg-0.75· min-1)。然而,在肥胖Zucker大鼠中,荷包牡丹碱给药后,对高碳酸血症的通气量没有变化(608 ± 96 vs. 580 ± 69 ml · kg−1· min−1)。我们的研究结果表明,内源性GABA抑制通气和限制肥胖Zucker大鼠的运动表现。
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.
内源性阿片类药物调节肥胖 Zucker 大鼠的通气和峰值耗氧量。
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
下丘脑 GABA 能对大鼠跑步机运动反应的影响
DOI: 10.1016/0361-9230(94)90077-9
发表时间: 1994
影响因子: 3.8
作者:
J. Overton;Michael W. Redding;S. L. Yancey;R. Stremel
通讯作者: R. Stremel
GABA 受体阻断对镇静新生仔猪缺氧呼吸反应的影响。
DOI: 10.1152/jappl.1994.77.2.1006
发表时间: 1994
影响因子: 3.3
作者:
Jian Huang;C. Suguihara;D. Hehre;Jing Lin;Eduardo Bancalari
通讯作者: Eduardo Bancalari