Related Experiment Video
Updated: Jul 10, 2026
06:08
Semi-Automated Isolation of the Stromal Vascular Fraction from Murine White Adipose Tissue Using a Tissue Dissociator
Published on: May 19, 2023
p38MAP Kinase activity is required for human primary adipocyte differentiation.
1INSERM, U 568, IFR50, F-06107, Nice, France. myriam.aouadi@umassmed.edu
FEBS Letters
|November 14, 2007
Summary
p38MAPK signaling is crucial for human adipocyte differentiation, promoting triglyceride accumulation and adipocyte marker expression. Inhibition of p38MAPK reduces adipogenesis by affecting key transcription factors like PPARgamma.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- The role of p38 mitogen-activated protein kinase (MAPK) in human adipocyte differentiation remains largely uncharacterized.
- Understanding the molecular mechanisms governing adipogenesis is vital for addressing metabolic disorders.
Purpose of the Study:
- To investigate the function of p38MAPK in the process of human adipocyte differentiation.
- To elucidate the molecular targets and pathways regulated by p38MAPK during adipogenesis.
Main Methods:
- Primary human preadipocytes were cultured and induced to differentiate.
- Pharmacological inhibitors were used to block p38MAPK activity during differentiation.
- Triglyceride accumulation, adipocyte marker expression, cell proliferation, and key transcription factor activity (C/EBPbeta, PPARgamma) were assessed.
Main Results:
- p38MAPK activity was observed to increase during human preadipocyte differentiation.
- Inhibition of p38MAPK significantly reduced triglyceride accumulation and the expression of adipocyte-specific markers.
- p38MAPK inhibition did not affect cell cycle arrest or proliferation.
- While C/EBPbeta induction was unaltered, its phosphorylation at Threonine(188) and PPARgamma expression were decreased upon p38MAPK inhibition.
Conclusions:
- p38MAPK plays a positive and essential role in human adipogenesis.
- The pro-adipogenic effects of p38MAPK are mediated through the regulation of C/EBPbeta phosphorylation and PPARgamma expression.
- Targeting p38MAPK could offer a potential strategy for modulating adipogenesis in metabolic diseases.
Related Concept Videos
01:07MAPK Signaling Cascades
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
01:25cAMP-dependent Protein Kinase Pathways
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
01:22PI3K/mTOR/AKT Signaling Pathway
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a rapamycin-insensitive companion...