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X Demographics
Mendeley readers
Attention Score in Context
| Title |
β‐adrenergic stimulation of skeletal muscle HSL can be overridden by AMPK signaling
|
|---|---|
| Published in |
FASEB Journal, July 2004
|
| DOI | 10.1096/fj.03-1067fje |
| Pubmed ID | |
| Authors |
Matthew J. Watt, Gregory R. Steinberg, Stanley Chan, Andrew Garnham, Bruce E. Kemp, Mark A. Febbraio |
| Abstract |
Hormone-sensitive lipase (HSL), an important regulatory enzyme for triacylglycerol hydrolysis within skeletal muscle, is controlled by beta-adrenergic signaling as well as intrinsic factors related to contraction and energy turnover. In the current study, we tested the capacity of 5'AMP-activated protein kinase (AMPK) to suppress beta-adrenergic stimulation of HSL activity. Eight male subjects completed 60 min of cycle exercise at 70% VO2 peak on two occasions: either with normal (CON) or low (LG) pre-exercise muscle glycogen content, which is known to enhance exercise-induced AMPK activity. Muscle samples were obtained before and immediately after exercise. Pre-exercise glycogen averaged 375 +/- 35 and 163 +/- 27 mmol x kg(-1) dm for CON and LG, respectively. AMPK alpha-2 was not different between trials at rest and was increased (3.7-fold, P<0.05) by exercise during LG only. HSL activity did not differ between trials at rest and increased (0 min: 1.67 +/- 0.13; 60 min: 2.60 +/- 0.26 mmol x min(-1) x kg(-1) dm) in CON. The exercise-induced increase in HSL activity was attenuated by AMPK alpha-2 activation in LG. The attenuated HSL activity during LG occurred despite higher plasma epinephrine levels (60 min: CON, 1.96 +/- 0.29 vs LG, 4.25 +/- 0.60 nM, P<0.05) compared with CON. Despite the attenuated HSL activity in LG, IMTG was decreased by exercise (0 min: 27.1 +/- 2.0; 60 min: 22.5 +/- 2.0 mmol x kg(-1) dm, P<0.05), whereas no net reduction occurred in CON. To confirm the apparent effect of AMPK on HSL activity, we performed experiments in muscle cell culture. The epineprine-induced increase in HSL activity was totally attenuated (P<0.05) by AICAR administration in L6 myotubes. These data provide new evidence indicating that AMPK is a major regulator of skeletal muscle HSL activity that can override beta-adrenergic stimulation. However, the increased IMTG degradation in LG suggests factors other than HSL activity are important for IMTG degradation. |
X Demographics
The data shown below were collected from the profiles of 3 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United Kingdom | 1 | 33% |
| Australia | 1 | 33% |
| United States | 1 | 33% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 2 | 67% |
| Scientists | 1 | 33% |
Mendeley readers
The data shown below were compiled from readership statistics for 50 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Argentina | 1 | 2% |
| Canada | 1 | 2% |
| Australia | 1 | 2% |
| Unknown | 47 | 94% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Ph. D. Student | 13 | 26% |
| Researcher | 9 | 18% |
| Professor | 7 | 14% |
| Student > Bachelor | 4 | 8% |
| Student > Master | 4 | 8% |
| Other | 9 | 18% |
| Unknown | 4 | 8% |
| Readers by discipline | Count | As % |
|---|---|---|
| Agricultural and Biological Sciences | 14 | 28% |
| Biochemistry, Genetics and Molecular Biology | 11 | 22% |
| Medicine and Dentistry | 7 | 14% |
| Sports and Recreations | 5 | 10% |
| Pharmacology, Toxicology and Pharmaceutical Science | 3 | 6% |
| Other | 4 | 8% |
| Unknown | 6 | 12% |
Attention Score in Context
This research output has an Altmetric Attention Score of 2. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 30 April 2014.
All research outputs
#15,168,167
of 25,371,288 outputs
Outputs from FASEB Journal
#6,595
of 11,446 outputs
Outputs of similar age
#52,200
of 59,034 outputs
Outputs of similar age from FASEB Journal
#51
of 55 outputs
Altmetric has tracked 25,371,288 research outputs across all sources so far. This one is in the 38th percentile – i.e., 38% of other outputs scored the same or lower than it.
So far Altmetric has tracked 11,446 research outputs from this source. They typically receive more attention than average, with a mean Attention Score of 8.5. This one is in the 40th percentile – i.e., 40% of its peers scored the same or lower than it.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 59,034 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 11th percentile – i.e., 11% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 55 others from the same source and published within six weeks on either side of this one. This one is in the 7th percentile – i.e., 7% of its contemporaries scored the same or lower than it.