Related Experiment Video

Updated: Jun 24, 2026

Studying Muscle Transcriptional Dynamics at Single-molecule Scales in Drosophila
10:22

Studying Muscle Transcriptional Dynamics at Single-molecule Scales in Drosophila

Published on: September 8, 2023

Smad2 and 3 transcription factors control muscle mass in adulthood

Roberta Sartori1, Giulia Milan, Maria Patron

  • 1Venetian Institute of Molecular Medicine, 35129 Padova, Italy.

American Journal of Physiology. Cell Physiology
|April 10, 2009
PubMed

Insights

Myostatin inhibitors can promote muscle growth by targeting Smad2/3 transcription factors. This approach aids muscle hypertrophy, particularly when combined with IGF-1-Akt activators for rehabilitation.

Area of Science:

  • Muscle physiology
  • Molecular biology
  • Biochemistry

Background:

  • Muscle wasting is a common complication in various diseases, impacting disease progression.
  • Myostatin negatively regulates muscle growth, making its inhibitors potential therapeutic targets.
  • The adult myostatin pathway's role and its transcription factors remain incompletely understood.

Purpose of the Study:

  • To investigate the role of the myostatin pathway in adult muscle mass regulation.
  • To identify downstream targets and transcription factors involved in myostatin signaling.
  • To explore therapeutic strategies for preventing muscle wasting.

Main Methods:

  • Genetic perturbation of the myostatin pathway in adult myofibers in vivo.
  • Analysis of downstream targets and their effect on muscle mass.
  • Investigating the involvement of Smad2/3, MuRF1, mTOR, and Akt signaling pathways.

Main Results:

  • Smad2 and Smad3 are identified as transcription factors downstream of myostatin/TGF-beta.
  • Smad2/3 inhibition induces a muscle atrophy program independent of MuRF1.
  • Inhibition of Smad2/3 promotes muscle hypertrophy, independent of satellite cells but partially dependent on mTOR signaling.

Conclusions:

  • The myostatin and Akt pathways exhibit cross-talk at multiple levels.
  • Myostatin inhibitors show promise for promoting muscle growth during rehabilitation.
  • Combination therapy with myostatin inhibitors and IGF-1-Akt activators may enhance muscle recovery.

More Related Videos

Identification of MyoD Interactome Using Tandem Affinity Purification Coupled to Mass Spectrometry14:47

Identification of MyoD Interactome Using Tandem Affinity Purification Coupled to Mass Spectrometry

Published on: May 17, 2016

Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis08:34

Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis

Published on: June 3, 2016

Related Concept Videos

Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Satellite Stem Cells and Muscular Dystrophy01:21

Satellite Stem Cells and Muscular Dystrophy

Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
General Transcription Factors01:30

General Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
Formation of Muscle Fibers from Myoblasts01:13

Formation of Muscle Fibers from Myoblasts

De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription factors...
Transcription Factors02:16

Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...