Evidence map›Paper›PMID 22052865›Full record

ArticleJournal of applied physiology (Bethesda, Md. : 1985)2012

Mild heat stress induces mitochondrial biogenesis in C2C12 myotubes.

Chien-Ting Liu, George A Brooks

Open access · greenAbstract read
In one paragraph

Article in Journal of applied physiology (Bethesda, Md. : 1985), 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 67 papers.

0numbers the graph read from it
0cells of the map it votes in
67citing papers in PubMed
3.8field-weighted citation impact, top 6% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

67 citing papers in PubMed, 147 citations in OpenAlex.

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7 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

2 authors at 1 institution in 2 countries.

Chien-Ting LiuExercise Physiology Laboratory, Department of Integrative Biology, University of California, Berkeley, California 94720-3140, USA.
George A Brooks
University of California, Berkeley · US

Funding

Physiological Signals to MCT ExpressionR01AR050459 · NIAMS · UNIVERSITY OF CALIFORNIA BERKELEY · PI BROOKS, GEORGE AUSTIN · 2005 to 2008
$1.2M
NIAMS NIH HHS R01 AR050459
6 · The paper itself

Abstract

During endurance exercise, most (≈75%) of the energy derived from the oxidation of metabolic fuels and ATP hydrolysis of muscle contraction is liberated as heat, the accumulation of which leads to an increase in body temperature. For example, the temperature of exercising muscles can rise to 40°C. Although severe heat injury can be deleterious, several beneficial effects of mild heat stress (HS), such as the improvement of insulin sensitivity in patients with type 2 diabetes, have been reported. However, among all cellular events induced by mild HS from physical activities, the direct effects and mechanisms of mild HS on mitochondrial biogenesis in skeletal muscle are least characterized. AMP-activated protein kinase (AMPK) and sirtuin 1 (SIRT1) are key energy-sensing molecules regulating mitochondrial biogenesis. In C2C12 myotubes, we found that 1 h mild HS at 40°C upregulated both AMPK activity and SIRT1 expression, as well as increased the expression of several mitochondrial biogenesis regulatory genes including peroxisome proliferator-activated receptor gamma coactivator-1α (PGC-1α) and transcription factors involved in mitochondrial biogenesis. In particular, PGC-1α expression was found to be transcriptionally regulated by mild HS. Additionally, after repeated mild HS for 5 days, protein levels of PGC-1α and several mitochondrial oxidative phosphorylation subunits were also upregulated. Repeated mild HS also significantly increased mitochondrial DNA copy number. In conclusion, these data show that mild HS is sufficient to induce mitochondrial biogenesis in C2C12 myotubes. Temperature-induced mitochondrial biogenesis correlates with activation of the AMPK-SIRT1-PGC-1α pathway. Therefore, it is possible that muscle heat production during exercise plays a role in mitochondrial biogenesis.

Indexed as

AMP-Activated Protein KinasesAnimalsCells, CulturedDNA, MitochondrialGene DosageGene ExpressionHeat-Shock ResponseHeat StrokeMaleMitochondria, MuscleMuscle Fibers, SkeletalMuscle, SkeletalMyoblastsOrganelle BiogenesisOxidative PhosphorylationPeroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alphaAMP-Activated Protein KinasesDNA, MitochondrialPeroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alphaPpargc1a protein, mouseSirtuin 1Trans-ActivatorsTranscription Factors

Identifiers

PMID22052865
PMCPMC3774254
OpenAlexW2131205229

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.