Regulation of contraction-induced FA uptake and oxidation by AMPK and ERK1/2 is intensity dependent in rodent muscle.
Regulation of contraction-induced FA uptake and oxidation by AMPK and ERK1/2 is intensity dependent in rodent muscle.
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AMPK 和 ERK1/2 对收缩诱导的 FA 摄取和氧化的调节在啮齿动物肌肉中具有强度依赖性。
DOI:
10.1152/ajpendo.00155.2006
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发表时间:
2006
期刊:
影响因子:
--
通讯作者:
Turcotte,LorraineP
中科院分区:
文献类型:
--
作者:
Raney,MarcellaA;Turcotte,LorraineP
Muscle contraction activates AMP-activated protein kinase (AMPK) and extracellular signal-regulated kinase (ERK1/2), two signaling molecules involved in the regulation of muscle metabolism. The purpose of this study was to determine whether activation of AMPK and/or ERK1/2 contributes to the regulation of muscle fatty acid (FA) uptake and oxidation in contracting muscle. Rat hindquarters were perfused during rest (R) or electrical stimulation (E) of increasing intensity by manipulating train duration (E1 = 25 ms, E2 = 50 ms, E3 = 100 ms, E4 = 200 ms). For matched FA delivery, FA uptake was significantly greater than R during E1, E2, and E3 (7.8 ± 0.7 vs. 14.4 ± 0.3, 16.9 ± 0.8, 15.2 ± 0.5 nmol·min−1·g−1, respectively,P< 0.05), but not during E4 (8.3 ± 0.3 nmol·min−1·g−1,P> 0.05). FA oxidation was significantly greater than R during E1 and E2 (1.5 ± 0.1 vs. 2.3 ± 0.2, 2.5 ± 0.2 nmol·min−1·g−1,P< 0.05) before returning to resting levels for E3 and E4 (1.8 ± 0.1 and 1.5 ± 0.2 nmol·min−1·g−1,P> 0.05). A positive correlation was found between FA uptake and ERK1/2 phosphorylation from R to E3 (R2= 0.55,P< 0.05) and between FA oxidation and ERK1/2 phosphorylation from R to E2 (R2= 0.76,P< 0.05), correlations that were not maintained when the data for E4 and E3 and E4, respectively, were included in the analysis (R2= 0.04 andR2= 0.03,P> 0.05). A positive correlation was also found between FA uptake and FA oxidation and AMPK activity for all exercise intensities (R2= 0.57,R2= 0.65 respectively,P< 0.05). These results, in combination with previous data from our laboratory, suggest that ERK1/2 and AMPK are the predominant signaling molecules regulating FA uptake and oxidation during low- to moderate-intensity muscle contraction and during moderate- to high-intensity muscle contraction, respectively.
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DOI:
10.1007/s004240000417
发表时间:
2000
期刊:
Pflügers Archiv
影响因子:
--
作者:
U. Widegren;C. Wretman;A. Lionikas;G. Hedin;J. Henriksson
通讯作者:
J. Henriksson
DOI:
10.1152/ajpendo.00301.2004
发表时间:
2005-03-01
影响因子:
5.1
作者:
Raney, MA;Yee, AJ;Turcotte, LP
通讯作者:
Turcotte, LP
影响因子:
3.3
作者:
P. Paul;B. Issekutz
通讯作者:
B. Issekutz
DOI:
10.1111/j.1365-201x.2005.01445.x
发表时间:
2005-06
期刊:
Acta physiologica Scandinavica
影响因子:
--
作者:
L. Turcotte;M. Raney;M. Todd
通讯作者:
L. Turcotte;M. Raney;M. Todd
DOI:
10.1152/ajpendo.00316.2001
发表时间:
2002
期刊:
American journal of physiology. Endocrinology and metabolism
影响因子:
--
作者:
Turcotte,LorraineP;Swenberger,JasonR;Yee,AliceJ
通讯作者:
Yee,AliceJ