ACE-031 (1mg)

Description

ACE-031 – Advanced Biochemical Mechanism & Signaling Profile

ACE-031 is a recombinant fusion protein consisting of the extracellular domain of the activin type IIB receptor (ActRIIB) linked to the Fc portion of human IgG. In research models, ACE-031 functions as a soluble decoy receptor that sequesters ligands involved in negative regulation of skeletal muscle growth, primarily myostatin (GDF-8) and related TGF-β superfamily members such as activins and GDF-11.

Receptor Kinetics & Ligand Binding

• ActRIIB normally binds circulating myostatin and activins with high affinity

• ACE-031 preserves the native ligand-binding region while lacking intracellular signaling domains

• As a soluble receptor, ACE-031 sequesters ligands before they can bind to membrane-bound ActRIIB

• This prevents the formation of the ActRIIB/ALK4 or ActRIIB/ALK5 receptor complexes required for canonical signaling

Researchers use ACE-031 to study ligand-receptor interactions, binding competition, and downstream suppression of inhibitory myokines in controlled models.

Smad Signaling Interference

Under normal conditions:

1. Myostatin or activin binds ActRIIB

2. Type I receptor (ALK4/ALK5) recruitment occurs

3. Smad2/3 phosphorylation is triggered

4. Smad2/3 form complexes with Smad4

5. The complex translocates to the nucleus to regulate gene transcription

ACE-031 blocks Step 1 by binding circulating ligands, resulting in:

• Reduced Smad2/3 phosphorylation

• Lowered transcription of muscle-suppressive genes

• Disinhibition of anabolic signaling pathways

Downstream Pathways & Gene Targets Studied

Suppression of Smad2/3 signaling allows researchers to examine changes in:

Muscle protein synthesis signaling

• mTORC1 activation

• Akt phosphorylation

• Decreased expression of E3 ubiquitin ligases (e.g., MuRF1, MAFbx/Atrogin-1)

Satellite cell activity

• Pax7, MyoD, Myf5 gene expression

• Myoblast proliferation and myotube formation

• Reduced expression of cell-cycle inhibitors involved in myostatin-mediated suppression

Extracellular matrix remodeling

• Alterations in collagen-associated genes

• Matrix signaling proteins involved in muscle fiber hypertrophy

This makes ACE-031 a frequent tool in studies of muscle atrophy, hypertrophy, and TGF-β–dependent transcriptional regulation.

Research Applications (In-Vitro / Laboratory Models Only)

ACE-031 is used to explore:

• Myostatin ligand trapping and receptor competition

• Disruption of TGF-β superfamily inhibitory signaling

• Gene transcription changes resulting from decreased Smad2/3 activation

• Cellular and molecular responses associated with skeletal muscle adaptation

Research-Only Classification

This material is supplied exclusively for in-vitro, laboratory research.
It is not a drug, supplement, therapy, or diagnostic agent, and is not approved for human or animal use.