Follistatin-344 (1mg) Research Peptide: A Full‑Length Isoform for Myostatin, Muscle & TGF‑β Studies

If your research investigates the molecular regulation of skeletal muscle mass, the myostatin signalling pathway, or the broader roles of TGF‑β superfamily ligands in tissue development and repair, Follistatin-344 (1mg) research peptide offers a precisely defined and extensively studied biological tool. Follistatin-344 (FS344) is the full‑length precursor isoform encoded by the FST gene, consisting of 344 amino acids [8†L5-L7][4†L6-L8]. Following proteolytic processing, it gives rise to the mature circulating form known as FS‑315 (315 amino acids) [8†L16-L18].

As a high‑affinity binding protein, follistatin functions as a potent endogenous inhibitor of several TGF‑β superfamily members—most notably myostatin (GDF‑8) and activins—by directly sequestering these ligands in the extracellular space and preventing them from activating their cognate receptors [8†L13-L15][9†L8-L9]. This positions Follistatin-344 (1mg) research peptide as a valuable tool for laboratories investigating muscle hypertrophy, neuromuscular preservation, metabolic regulation, tissue fibrosis, and the broader biology of TGF‑β superfamily signalling.

At Chinese Grey Peptides, we supply high‑purity Follistatin-344 (1mg) research peptide to research institutions and wholesale buyers across the United Kingdom, France, Germany, Spain, Sweden, Italy, and the USA. Every batch is lyophilised, HPLC‑verified to >98% purity, and accompanied by a Certificate of Analysis (COA), ensuring your investigations into myostatin inhibition, muscle regeneration, and TGF‑β signalling begin with uncompromising quality.

What Is Follistatin-344 and How Does It Work?

To fully appreciate the research potential of Follistatin-344 (1mg) research peptide, it is essential to understand its biochemical identity and the mechanisms by which it exerts its pleiotropic effects.

The Full‑Length Isoform

Follistatin-344 is a naturally occurring single‑chain glycoprotein that functions as a potent endogenous inhibitor of members of the TGF‑β superfamily [8†L12-L15]. The “344” designation refers to the full‑length precursor protein containing 344 amino acids; after removal of a 29‑amino‑acid signal peptide, the mature circulating form is known as FS‑315 (315 amino acids) [8†L16-L18]. The single FST gene encodes two primary isoforms—FST317 and FST344—through alternative splicing of the precursor mRNA [4†L6-L8].

Follistatin was first identified in 1987 by Nicholas Ling and colleagues from porcine ovarian follicular fluid based on its ability to suppress follicle‑stimulating hormone (FSH) secretion from pituitary cells—hence its name (follicle + statin = follicle‑suppressing) [8†L19-L22]. Subsequently, follistatin was recognised to exert its FSH‑suppressive effect not by acting directly on the pituitary but by neutralising activin, the primary stimulator of FSH synthesis and secretion [8†L23-L25].

Mechanism of Action: Ligand Trapping

The biological activity of Follistatin-344 (1mg) research peptide is mediated through its function as a ligand trap (also called a decoy receptor or neutralising binding protein) [8†L37-L41]:

• High‑Affinity Ligand Binding: Follistatin binds directly to its target ligands—activin A, activin B, myostatin (GDF‑8), GDF‑11, BMP‑2, BMP‑5, and BMP‑7—with high affinity [8†L9-L10][5†L41-L42]. The binding is essentially irreversible under physiological conditions [8†L42-L44].

• Receptor Engagement Blockade: The follistatin‑ligand complex is unable to bind to type II activin receptors (ActRIIA/ActRIIB) on cell surfaces [8†L44-L45].

• Downstream Signalling Inhibition: This sequestration prevents the activation of downstream SMAD2/3‑dependent transcriptional programs that would otherwise constrain myogenic differentiation and promote muscle atrophy [9†L41-L43].

• Ligand Clearance: The bound complex is internalised via cell surface proteoglycans and degraded through lysosomal pathways, effectively reducing the pool of available ligand for receptor activation [8†L46-L47].

Research Note: FS344 vs. FS317

The FST gene encodes two primary isoforms, FST317 and FST344, containing 317 and 344 amino acids, respectively, resulting from alternative splicing of the precursor mRNA [4†L6-L8]. FS344 generates the serum‑circulating FS315 isoform [1†L16-L17]. The FS344 isoform is the predominant isoform expressed in most non‑gonadal tissues [0†L5-L6][5†L38] and has been the focus of clinical gene therapy trials for Becker muscular dystrophy [4†L15-L17].

Key Research Applications for Follistatin-344 (1mg)

Follistatin-344 (1mg) research peptide is a versatile tool with applications spanning several domains of biomedical research.

1. Muscle Biology & Myostatin Inhibition Research

The most established application of Follistatin-344 lies in its ability to serve as a potent myostatin antagonist for studying skeletal muscle regulation. Research has demonstrated:

• Muscle Hypertrophy Studies: Follistatin binds myostatin, preventing its receptor binding that would normally allow for the downregulation of genes responsible for myoblast proliferation and differentiation [1†L29-L32].

• Satellite Cell Activation: Follistatin is an essential regulator for muscle development [2†L35-L36], and its overexpression enhances skeletal muscle growth [2†L37].

• Muscle Wasting Models: Follistatin functions as a potent inhibitor of the myostatin pathway, resulting in an increase in skeletal muscle mass [1†L14-L16].

• Preclinical Evidence: Transgenic expression of human follistatin-344 increases skeletal muscle mass in pigs [2†L30-L31], and it is widely discussed in biological research for its role in regulating muscle growth pathways [0†L38-L40].

2. TGF‑β Superfamily Signalling Research

Follistatin-344 is widely applied in the analysis of TGF‑β superfamily signalling:

• Activin Sequestration: By binding activins, Follistatin-344 alters SMAD‑dependent transcriptional outputs, potentially reshaping cytokine expression profiles and growth factor cascades [9†L56-L58].

• BMP Signalling Studies: Follistatin binds BMP‑2, BMP‑4, BMP‑5, and BMP‑7, making it a valuable tool for studying bone morphogenetic protein pathways [5†L41-L42][8†L9-L10].

• Receptor‑Ligand Interactions: As a molecular probe to study activin and myostatin function, regulation, and receptor‑ligand interactions [6†L38-L39].

3. Metabolic & Endocrine Research

Follistatin-344 has been investigated for its effects on metabolism and endocrine function:

• Fat Accumulation Reduction: Transcriptomic analysis in transgenic pigs has elucidated enhanced skeletal muscle mass and reduced fat accumulation [2†L4-L8].

• FSH Regulation: Follistatin was originally identified as an FSH‑suppressing factor through its neutralisation of activin [8†L21-L24].

4. Fibrosis & Tissue Remodelling Research

Follistatin-344 may influence extracellular matrix remodelling, collagen deposition patterns, and local inflammatory mediators [9†L50-L52]. Research applications include:

• Fibrosis Models: Investigating how myostatin inhibition influences fibrotic pathways.

• Tissue Plasticity: Exploring adaptive remodelling within skeletal systems [9†L52-L53].

5. Clinical & Translational Research

Follistatin-344 has entered clinical trials:

• Becker Muscular Dystrophy: Gene therapy approaches using FS‑344 have entered clinical trials for Becker muscular dystrophy with promising early results [8†L30-L31][4†L15-L17].

• Muscle Wasting Diseases: The discovery that follistatin binds and neutralises myostatin has generated interest in follistatin as a potential therapeutic agent for muscular dystrophies, sarcopenia, and cachexia [8†L27-L29].

Chemical & Physical Specifications for Follistatin-344 (1mg)

Accurate characterisation of Follistatin-344 (1mg) research peptide is essential for reproducible experimental design.

Note: The 1 mg mass refers to the weight of the peptide in its lyophilised form. Follistatin-344 is typically supplied as a lyophilised powder in a sealed glass vial for laboratory research use only [5†L17-L18]. The product is not for human or veterinary use. FS344 is the predominant isoform of follistatin expressed in most non‑gonadal tissues [5†L38].

Reconstitution & Handling Protocol for Follistatin-344 (1mg)

Proper reconstitution of Follistatin-344 (1mg) research peptide is critical for maintaining its structural integrity and biological activity. The peptide is supplied as a lyophilised powder in a sealed glass vial [5†L17-L18] and requires reconstitution with bacteriostatic water or sterile PBS before use [5†L26-L27].

Step 1 – Preparation

• Bring the sealed Follistatin-344 vial and your chosen diluent (sterile bacteriostatic water or sterile PBS, pH 5‑7) to room temperature. Condensation can degrade the lyophilised powder.

• Clean your work surface with 70% ethanol and lay out sterile syringes, alcohol wipes and a clean work mat.

Step 2 – Vial Sanitisation

• Wipe the rubber stopper of the Follistatin-344 vial with a fresh 70% ethanol wipe. Allow the alcohol to evaporate completely before piercing.

Step 3 – Reconstitution

• Draw your desired volume of diluent into a sterile syringe. A common starting concentration for research applications is 1 mg per 0.1‑0.2 mL of diluent, yielding a 5‑10 mg/mL stock solution.

• Insert the needle and slowly inject the diluent against the inner glass wall. Do not spray directly onto the lyophilised powder.

• Gently swirl the vial until the solution is clear and fully dissolved. Do not shake vigorously, as shaking can cause denaturation.

Step 4 – Aliquoting & Storage

• Immediately after dissolution, aliquot the reconstituted Follistatin-344 into single‑use sterile vials.

• Store aliquots at –20°C. Avoid repeated freeze‑thaw cycles, as peptides are susceptible to degradation.

• Once thawed, store at 2‑8°C and use within a short period.

Concentration Reference Table for Follistatin-344 (1mg)

Adjust diluent volume based on your experimental requirements. The peptide is soluble in water and buffered aqueous solutions (e.g., PBS) [6†L23].

Storage & Stability Guidelines for Follistatin-344 (1mg)

Why Choose Chinese Grey Peptides for Follistatin-344 (1mg)?

As an authentic licensed peptide supplier based in the USA, we supply Follistatin-344 (1mg) research peptide and a wide range of research‑grade compounds under rigorous quality assurance protocols, fully aligned with Google’s E‑E‑A‑T standards (Experience, Expertise, Authoritativeness, Trustworthiness).

• Verified Purity: Independent HPLC analysis with purity guaranteed >98% for every batch [5†L5-L6][6†L10].

• Third‑Party Testing: Selected lots are independently tested by third‑party laboratories for additional verification [5†L6-L7].

• GMP‑Aligned Manufacturing: Manufactured under GMP‑aligned processes with comprehensive batch traceability [7†L31-L32].

• Full Traceability: Batch‑specific Certificates of Analysis (COA) are available for every order [7†L33-L34].

• Wholesale Supply: We serve research institutions, laboratories, and wholesale buyers across the UK, EU, and USA with flexible volume pricing and reliable logistics.

• USA‑Based Regulatory Compliance: All products are supplied strictly as research‑grade chemicals for laboratory use only (RUO). This product is intended for scientific research and experimental use in controlled settings. Not for human or veterinary use [5†L23-L25][7†L16-L17].

Researchers across the United States—including those at leading institutions—trust us for fast domestic delivery, transparent documentation and professional technical support.

FAQ: Follistatin-344 (1mg) Research Peptide

 What is Follistatin-344 (1mg) research peptide?
Follistatin-344 (FS344) is a full‑length, naturally occurring glycoprotein that functions as a high‑affinity binding protein for select members of the TGF‑β superfamily, most notably activins and myostatin [6†L24-L27]. The “344” designation refers to the full‑length precursor protein containing 344 amino acids; after removal of a 29‑amino‑acid signal peptide, the mature circulating form is FS‑315 [8†L16-L18].

What is the mechanism of action of Follistatin-344?
Follistatin functions as a ligand trap by binding directly to TGF‑β superfamily ligands (myostatin, activins, BMPs) with high affinity, preventing them from interacting with their signalling receptors [8†L37-L41]. The follistatin‑ligand complex is essentially irreversible under physiological conditions and is internalised and degraded through lysosomal pathways [8†L42-L47].

What are the primary research applications for Follistatin-344?
Follistatin-344 is used in muscle biology and myostatin inhibition research (muscle hypertrophy, satellite cell activation, muscle wasting models), TGF‑β superfamily signalling research (activin sequestration, BMP studies), metabolic and endocrine research (fat accumulation reduction, FSH regulation), fibrosis and tissue remodelling research, and clinical/translational research (Becker muscular dystrophy gene therapy).

What is the molecular weight of Follistatin-344?
The mature FS‑315 glycoprotein has a molecular weight of approximately 38 kDa [8†L4]. The full‑length precursor contains 344 amino acids [8†L5-L7].

 What are the isoforms of follistatin?
The single FST gene encodes two primary isoforms—FST317 and FST344—containing 317 and 344 amino acids, respectively, resulting from alternative splicing of the precursor mRNA [4†L6-L8][3†L13-L14]. FS344 is the predominant isoform expressed in most non‑gonadal tissues [5†L38] and generates the serum‑circulating FS315 isoform [1†L16-L17].

What purity does your Follistatin-344 (1mg) meet?
Our Follistatin-344 is tested to >98% purity by HPLC [5†L5-L6][6†L10]. A Certificate of Analysis (COA) is supplied with every order.

 How should I reconstitute Follistatin-344 (1mg)?
Reconstitute with sterile bacteriostatic water or sterile PBS (pH 5‑7) [6†L23][5†L26-L27]. Allow the vial to reach room temperature, then slowly inject the diluent against the inner glass wall and swirl gently. Do not shake. A typical starting concentration is 10 mg/mL.

 How should I store reconstituted Follistatin-344?
Reconstituted Follistatin-344 should be stored at 2‑8°C for short‑term use. For longer storage, aliquot immediately into single‑use vials and store at –20°C for up to 3 months. Avoid repeated freeze‑thaw cycles [6†L22].

Is Follistatin-344 research peptide legal to purchase in the USA?
Yes. Follistatin-344 is a laboratory reagent sold for research use only (RUO) [5†L17-L18][6†L14]. It is fully legal to purchase, possess, and use in the United States for legitimate in‑vitro or in‑vivo scientific research, provided it is not marketed with therapeutic claims.

 Does Chinese Grey Peptides ship internationally?
Yes. We ship across the UK, Europe (France, Germany, Spain, Sweden, Italy), and the USA from our US warehouse. Wholesale pricing is available for bulk orders.

Scientific References

1. PubMed — The emerging role of follistatin under stresses and its implications in diseases.
2. PubMed — Myostatin: Basic biology to clinical application.
3. PubMed — Inhibition of myostatin with emphasis on follistatin as a therapy for muscle disease.
4. FDA — FDA’s Concerns About Unapproved Drugs.

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Important Compliance Notice

Follistatin-344 (1mg) may be regulated differently depending on the country, product type, labeling, intended use, buyer type, and destination. Chinese Grey Peptides does not provide medical advice, dosing instructions, injection guidance, skin-lightening guarantees, pigmentation-treatment claims, melanin-inhibition claims, anti-aging claims, disease claims, treatment claims, cosmetic formulation instructions, or personal-use recommendations.

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From its discovery as an activin‑binding protein to its well‑characterised role as a potent inhibitor of myostatin and other TGF‑β superfamily ligands, Follistatin-344 (1mg) research peptide provides a precisely defined and extensively validated platform for advanced muscle and TGF‑β signalling research.

Its ability to modulate skeletal muscle growth, reduce fat accumulation, and influence tissue remodelling—supported by peer‑reviewed research published in PubMed, PMC, and other authoritative journals—makes it a valuable addition to any laboratory investigating myostatin signalling, muscle biology, or the broader regulatory roles of TGF‑β superfamily ligands. By choosing high‑purity, lab‑verified Follistatin-344 (1mg) research peptide from Chinese Grey Peptides, you ensure that your research is built on a foundation of quality, reproducibility, and scientific integrity.

Ready to advance your research with Follistatin-344 (1mg)? Browse our product catalogue, request a wholesale quote, or contact our support team today to discuss your laboratory’s specific needs. Place your order now and receive GMP‑grade Follistatin-344 delivered directly to your facility in the USA, UK, or Europe.