Evidence map›Paper›PMID 19074989›Full record

ArticleDiabetes2009

Muscle-derived angiopoietin-like protein 4 is induced by fatty acids via peroxisome proliferator-activated receptor (PPAR)-delta and is of metabolic relevance in humans.

Harald Staiger, Carina Haas, Jürgen Machann, Roman Werner, Melanie Weisser, Fritz Schick, Fausto Machicao, Norbert Stefan, Andreas Fritsche, Hans-Ulrich Häring

Open access · hybridAbstract read
In one paragraph

Article in Diabetes, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 96 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
96citing papers in PubMed, 1 pooled it
5.3field-weighted citation impact, top 4% 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

96 citing papers in PubMed, 1 synthesis or guideline pooled it, 185 citations in OpenAlex.

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  20. Nutrients · 2021
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36 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

10 authors at 1 institution in 1 country.

Harald StaigerDepartment of Internal Medicine, Division of Endocrinology, Diabetology, Angiology, Nephrology, and Clinical Chemistry, Eberhard-Karls-University Tübingen, Tübingen, Germany. harald.staiger@med.uni-tuebingen.de
Carina Haas
Jürgen Machann
Roman Werner
Melanie Weisser
Fritz Schick
Fausto Machicao
Norbert Stefan
Andreas Fritsche
Hans-Ulrich Häring
University of Tübingen · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveLong-chain fatty acids (LCFAs) contribute to metabolic homeostasis in part via gene regulation. This study's objective was to identify novel LCFA target genes in human skeletal muscle cells (myotubes). RESEARCH DESIGN AND

methodsIn vitro methods included culture and treatment of human myotubes and C2C12 cells, gene array analysis, real-time RT-PCR, Western blotting, ELISA, chromatin immunoprecipitation, and RNA interference. Human subjects (two cohorts) were characterized by oral glucose tolerance test, hyperinsulinemic-euglycemic clamp, magnetic resonance imaging and spectroscopy, and standard blood analyses (glucose, insulin, C-peptide, and plasma lipids).

resultsWe show here that ANGPTL4 (encoding angiopoietin-like protein 4) represents a prominent LCFA-responsive gene in human myotubes. LCFA activated peroxisome proliferator-activated receptor (PPAR)-delta, but not PPAR-alpha or -gamma, and pharmacological activation of PPAR-delta markedly induced ANGPTL4 production and secretion. In C2C12 myocytes, knockdown of PPARD, but not of PPARG, blocked LCFA-mediated ANGPTL4 induction, and LCFA treatment resulted in PPAR-delta recruitment to the ANGPTL4 gene. In addition, pharmacological PPAR-delta activation induced LIPE (encoding hormone-sensitive lipase), and this response crucially depended on ANGPTL4, as revealed by ANGPTL4 knockdown. In a human cohort of 108 thoroughly phenotyped subjects, plasma ANGPTL4 positively correlated with fasting nonesterified fatty acids (P = 0.0036) and adipose tissue lipolysis (P = 0.0012). Moreover, in 38 myotube donors, plasma ANGPTL4 levels and adipose tissue lipolysis in vivo were reflected by basal myotube ANGPTL4 expression in vitro (P = 0.02, both).

conclusionsANGPTL4 is produced by human myotubes in response to LCFA via PPAR-delta, and muscle-derived ANGPTL4 seems to be of systemic relevance in humans.

Indexed as

Glucose Tolerance TestAngiopoietin-Like Protein 4AngiopoietinsBlood GlucoseC-PeptideGene Expression RegulationGlucose Clamp TechniqueHumansInsulinLinoleic AcidLipidsMuscle Fibers, SkeletalMuscle, SkeletalOligonucleotide Array Sequence AnalysisPalmitic AcidPPAR alphaAngiopoietin-Like Protein 4AngiopoietinsANGPTL4 protein, humanBlood GlucoseC-PeptideInsulinLinoleic AcidLipidsPalmitic AcidPPAR alphaPPAR deltaRNA, Messenger

Identifiers

PMID19074989
PMCPMC2646056
OpenAlexW2127054137

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
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.