FOLLISTATIN-344 (FST344)

Myostatin & Activin Signaling • Skeletal Muscle Biology Research Protein

For Research Use Only

Overview

Follistatin-344 (FST344) is a recombinant research protein associated with the follistatin family of extracellular binding proteins.

Follistatin is best known for its ability to bind and regulate several members of the TGF-β superfamily, particularly activins and myostatin (GDF-8).

Because myostatin is an important negative regulator of skeletal-muscle growth, follistatin has become a significant research target in studies involving muscle development, tissue growth, cellular differentiation, regeneration, and TGF-β-family signaling.

Research Areas

Follistatin research includes:

• Myostatin/GDF-8 signaling
• Activin signaling
• Skeletal-muscle biology
• Muscle-cell differentiation
• Myogenesis
• Satellite-cell biology
• Muscle hypertrophy models
• Tissue remodeling
• Regenerative biology
• TGF-β superfamily signaling
• Fibrosis research
• Reproductive biology
• Endocrine signaling
• Cellular growth and differentiation

Mechanism Being Studied

Follistatin functions primarily as an extracellular binding protein.

It can bind activins and other related TGF-β-family ligands, limiting their ability to activate their respective receptors.

A simplified pathway is:

Follistatin → Ligand Binding → Reduced Activin/Myostatin Signaling → Changes in Cellular Growth & Differentiation

For skeletal-muscle research, the relationship with myostatin is particularly important.

Myostatin & Muscle Research

Myostatin (GDF-8) is produced primarily in skeletal muscle and acts as a powerful regulator that limits excessive muscle growth.

Simplified:

Myostatin → Activin Type II Receptors → SMAD Signaling → Restriction of Muscle Growth

Follistatin can bind myostatin and interfere with its receptor interaction.

Researchers therefore investigate:

Follistatin ↑ → Myostatin Signaling ↓ → Altered Muscle-Growth Regulation

This mechanism has produced substantial interest in follistatin for experimental models of skeletal-muscle development and muscle-wasting disorders.

Activin Signaling Research

Follistatin biology extends well beyond myostatin.

Its strong interaction with Activin A is central to its physiological function.

Activins participate in:

• Cell growth and differentiation
• Reproductive physiology
• Endocrine signaling
• Inflammatory processes
• Tissue remodeling
• Fibrotic signaling

Follistatin can sequester activin and regulate its availability to activin receptors.

This is why follistatin should not be described simply as a “myostatin blocker.” Its biological effects involve a considerably broader signaling network.

Skeletal-Muscle Research

Experimental manipulation of the follistatin–myostatin–activin system has produced substantial changes in skeletal-muscle mass in animal models.

Researchers investigate relationships involving:

Follistatin ↔ Myostatin ↔ Activin ↔ Muscle Growth

Research areas include:

• Muscle-fiber development
• Muscle mass regulation
• Myogenic differentiation
• Satellite-cell activity
• Muscle regeneration
• Protein synthesis and degradation
• Neuromuscular disease models

These experimental findings should not be interpreted as establishing FST344 as a proven muscle-building treatment in humans.

Follistatin-344 vs. Other Follistatin Forms

This distinction is particularly important for the Voltis listing.

FST344 refers to a follistatin precursor containing 344 amino acids.

Naturally occurring follistatin biology also includes important isoforms commonly described as:

FST315 — a circulating form with relatively greater systemic distribution.

FST288 — a shorter form with stronger association with cell surfaces and extracellular matrices.

Because these molecules can differ in localization and biological activity, findings involving one follistatin form should not automatically be attributed to FST344.

For Voltis, the vial label, product specification and COA should all identify the same molecular form.

Why Researchers Study Follistatin-344

Follistatin provides researchers with an important way to investigate a biological regulatory system controlling tissue growth.

Key relationships include:

Follistatin → Myostatin / Activin Regulation → SMAD Signaling → Cellular Growth & Differentiation

Researchers study this system in connection with:

• Muscle development
• Muscle regeneration
• Tissue remodeling
• Cellular differentiation
• Fibrosis
• Endocrine physiology
• TGF-β signaling
• Regenerative biology

Product Features

✔ Premium Research Grade
✔ Follistatin-344 (FST344)
✔ Recombinant Research Protein
✔ Third-Party Tested (COA Available)
✔ Identity & Purity Verification
✔ Batch & Lot Traceability
✔ Secure Professional Packaging
✔ Laboratory Research Only

Common Research Applications

FST344 may be investigated in laboratory models involving:

• Myostatin signaling
• Activin signaling
• Skeletal-muscle physiology
• Myogenesis
• Muscle-cell differentiation
• Satellite-cell biology
• Tissue remodeling
• TGF-β superfamily pathways
• Fibrosis biology
• Regenerative research

Storage

Store according to the product’s batch-specific stability documentation.

Protect lyophilized material from excessive heat, moisture, and direct sunlight.

Following preparation for laboratory experiments, use validated laboratory storage procedures and minimize unnecessary temperature cycling or repeated freeze-thaw exposure.

Important Research Distinction

Follistatin is sometimes marketed simply as a “myostatin inhibitor.” That’s incomplete.

Follistatin interacts with multiple TGF-β-family ligands, especially activins, meaning experimental manipulation can potentially affect biological pathways extending well beyond skeletal muscle.

Additionally, results from gene-therapy studies, animal models, FST288/FST315 research, or other follistatin constructs should not automatically be presented as evidence for a particular FST344 product.

Disclaimer

For Research Use Only.

Follistatin-344 is an investigational research protein. Experimental evidence involving follistatin, myostatin inhibition, or related signaling pathways should not be interpreted as establishing FST344 as a safe or effective muscle-building or therapeutic intervention in humans.

This Voltis product is intended exclusively for laboratory research and analytical purposes.

Not intended for human or veterinary use.

Why Choose Voltis Research Co.

At Voltis Research Co., quality begins with verification. This is particularly important with recombinant proteins such as FST344, where researchers need confidence in molecular identity, purity and batch consistency.

Qualifying batches undergo independent third-party analytical testing, with batch-specific Certificates of Analysis available to document identity and purity.

The Voltis Commitment

⚡ Research-Grade Quality
⚡ Independent Third-Party Testing
⚡ Batch-Specific Certificate of Analysis (COA)
⚡ High-Purity Research Compounds
⚡ Rigorous Quality Control
⚡ Secure Professional Packaging
⚡ Transparency, Consistency & Reliability

Powering Discovery Through Quality Research.