Follistatin 344 Peptide

Follistatin 344 Peptide (FS-344)

Welcome to buypeptidesonlineusa.com, your premier domestic source for high-purity research peptides and proteins. Our Follistatin 344 (FS-344) is a synthetic version of a key endogenous protein isoform, meticulously manufactured for advanced investigations into myostatin inhibition, skeletal muscle hyperplasia, tissue regeneration, and metabolic pathways. As a powerful regulator of the TGF-β superfamily, Follistatin 344 represents a cutting-edge tool for researchers exploring muscle-wasting conditions, age-related sarcopenia, and novel anabolic mechanisms. We ensure your critical research is supported by uncompromising quality, transparency, and rapid fulfillment.

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⚠️ Important Research Compliance Notice

This product is intended strictly for laboratory research use only and is not for human consumption or veterinary use. This product is not a medicine, drug, or medical device. It has not been evaluated by the FDA. This protein is sold for investigational purposes by qualified researchers and professionals only.

🔬 What is Follistatin 344 Peptide?

Follistatin 344 (FS-344) is one of the major isoforms of the naturally occurring autocrine glycoprotein follistatin, which is produced by alternative splicing of the FST gene . This specific isoform corresponds to the full-length precursor protein, which, after post-translational processing, gives rise to the mature Follistatin 315 (FS-315) that circulates in the blood . It is a single-chain polypeptide consisting of 344 amino acids (including the signal sequence) with a predicted molecular weight of approximately 34.7-38.0 kDa .

Follistatin is best known as a high-affinity binding protein and potent antagonist of several members of the transforming growth factor-beta (TGF-β) superfamily . Its primary binding targets include:

• Myostatin (MSTN): A powerful negative regulator of skeletal muscle growth. By binding to and neutralizing myostatin, follistatin removes this “brake” on muscle development, leading to significant increases in muscle mass and strength .
• Activins: These proteins are involved in a wide range of biological processes, including inflammation, fibrosis, and the regulation of follicle-stimulating hormone (FSH). Follistatin neutralizes activin activity, modulating these pathways .
• Bone Morphogenetic Proteins (BMPs): Follistatin can also bind and regulate certain BMPs, influencing processes like cell differentiation and tissue development .

The unique property of the FS-344 isoform is that its processed product, FS-315, is the primary circulating form in the body, designed for systemic distribution rather than local cell-surface binding . This makes synthetic FS-344 an invaluable tool for researchers aiming to study the systemic effects of myostatin and activin inhibition.

✅ Why Choose Buy Peptides Online USA for Your Research?

When you need to buy Follistatin 344 peptide online, quality and consistency are non-negotiable. Here is why discerning researchers choose us:

• Verified Purity: We provide access to independent third-party documentation, confirming purity via HPLC or SDS-PAGE exceeding 95% and low endotoxin levels (<0.1 EU/μg), consistent with industry standards for research-grade proteins .
• Recombinant Production Excellence: Our FS-344 is produced in advanced systems to ensure proper folding, disulfide bond formation, and full bioactivity.
• Optimal Storage & Handling: Our Follistatin 344 is shipped in lyophilized form. For long-term stability, store at -20°C or below, protected from light and moisture .
• Domestic Shipping: As a USA-based supplier, we offer fast, reliable shipping. Orders typically arrive within 2-5 business days in discreet, temperature-controlled packaging.
• Research-Focused: We make no medical claims. Our service is built on integrity, providing accurately labeled products for legitimate scientific inquiry.

🔎 Product Specifications & Technical Data

To ensure your research parameters are met with precision, here are the verified technical specifications for our Follistatin 344 protein. Purity, bioactivity, and low endotoxin levels are critical for research accuracy, and our product meets the high standards expected by the scientific community .

🧪 Key Research Applications & Focus Areas

Follistatin 344’s role as a key regulator of the TGF-β superfamily makes it a highly sought-after tool in several advanced research fields.

• 💪 Muscle Biology, Hyperplasia & Sarcopenia Research: The most prominent application of FS-344 is in the study of myostatin inhibition. By binding to and neutralizing myostatin, follistatin promotes significant skeletal muscle growth through both hypertrophy (increase in size of existing fibers) and hyperplasia (growth of new muscle cells/fibers) . Researchers utilize FS-344 to model muscle enhancement, investigate pathways involved in muscle wasting (cachexia, sarcopenia, muscular dystrophy), and evaluate potential therapeutic strategies for neuromuscular diseases . Preclinical studies in animal models, from mice to non-human primates, have demonstrated remarkable increases in muscle mass and strength following follistatin administration .
• ⚖️ Metabolic & Obesity Research: Emerging research highlights a critical role for the follistatin/myostatin axis in energy metabolism. Follistatin has been shown to promote the browning of white adipose tissue (WAT) , increasing energy expenditure. It also influences key metabolic markers; in some studies, follistatin administration decreased leptin levels and increased adiponectin, suggesting improved metabolic health and insulin sensitivity . This makes FS-344 a valuable tool for studying thermogenesis and potential interventions for obesity and type 2 diabetes.
• 🩺 Inflammation, Fibrosis & Tissue Regeneration Research: Through its antagonism of activin, follistatin modulates pro-inflammatory and pro-fibrotic pathways. Researchers use FS-344 to study its protective effects in models of inflammatory diseases and tissue fibrosis (e.g., in liver, kidney, or lung), and to understand its role in regulating the immune response and tissue repair mechanisms .
• 🧬 Reproductive Endocrinology: Follistatin was first isolated from ovarian follicular fluid and is a key regulator of the hypothalamic-pituitary-gonadal axis . By suppressing activin, it negatively regulates follicle-stimulating hormone (FSH) secretion. It is used in research to study fertility, reproductive cycles, polycystic ovary syndrome (PCOS), and related endocrine disorders .

🔬 How Does Follistatin 344 Work? (Mechanism of Action)

The primary mechanism of Follistatin 344 involves its function as a high-affinity binding protein that acts as a ligand trap :

• Ligand Sequestration: FS-344 (and its processed form FS-315) binds directly to its target ligands, such as myostatin and activin-A, with high affinity. This binding prevents these ligands from interacting with their cell-surface receptors, primarily Activin Receptor Type IIB (ActRIIB) .
• Signal Neutralization: By blocking the ligand-receptor interaction, follistatin effectively neutralizes downstream catabolic signaling cascades, primarily the Smad2/3 pathway . Inhibition of this pathway leads to the de-repression of muscle growth.
• Cellular Outcomes: This blockade results in:
  • Enhanced muscle protein synthesis via increased mTOR activity .
  • Increased satellite cell activation and differentiation for muscle repair and regeneration (hyperplasia) .
  • Promotion of a more metabolically active phenotype in adipose tissue.
• Isoform-Specific Properties: The FS-344 isoform gives rise to FS-315, which has a unique acidic C-terminal tail. This tail reduces its affinity for cell-surface heparan sulfate proteoglycans, allowing it to circulate systemically and act as a reservoir for ligand neutralization in the bloodstream, avoiding some local off-target effects .

📝 Handling, Storage, and Preparation for Research

Proper handling is critical to maintaining protein integrity and ensuring experimental validity .

• Receiving & Storage: Upon receipt, store the lyophilized vial in a freezer at -20°C to -80°C. It is stable under these conditions for up to 12 months. Protect from light.
• Reconstitution:
  1. Centrifuge: Briefly centrifuge the vial before opening to collect the lyophilized powder at the bottom.
  2. Reconstitute: Reconstitute the protein to a concentration of 0.1-1.0 mg/mL in sterile, distilled water or sterile PBS .
  3. Mixing: Add the liquid slowly down the side of the vial. Do not vortex. Gently swirl or invert the vial until the protein is fully dissolved.
• Dilution & Handling for Bioassays: For use in cell culture or functional assays, further dilute the reconstituted stock into the appropriate pre-warmed culture medium. To prevent protein adsorption to tubes and pipette tips at low concentrations, use low-protein-binding plastics and include a carrier protein (0.1% BSA) in the dilution buffer.
• Post-Reconstitution Storage:
  • Short-term: Store the reconstituted solution at 2-8°C for up to 1 week.
  • Long-term: For longer storage, aliquot the solution into single-use vials and freeze at -20°C to -80°C for up to 3-6 months.
  • Critical: Avoid repeated freeze-thaw cycles, as this will degrade the protein and reduce its activity. Adding a carrier protein (0.1% BSA, 5% HSA, or 10% FBS) to the aliquots is highly recommended to maintain stability during frozen storage .
• Safety & Handling: Always use personal protective equipment (PPE) such as gloves and safety goggles when handling. Work in a laminar flow hood or well-ventilated area. Dispose of all waste in appropriate biohazard containers.

❓ Frequently Asked Questions (FAQ)

Q1: What is the difference between Follistatin 344 (FS-344) and other Follistatin isoforms like FS-315?

A: FS-344 is the full-length precursor protein. After production, the cell cleaves a signal peptide, and the mature, circulating form of the protein is Follistatin 315 (FS-315) , which consists of 315 amino acids . The FS-344 isoform is used in research to produce this systemically active form. It is distinct from the shorter FS-288 isoform, which binds strongly to cell surfaces and acts more locally .

Q2: How does Follistatin 344 promote such significant muscle growth?

A: FS-344 promotes muscle growth primarily by binding to and inhibiting myostatin, a potent negative regulator of muscle mass . By neutralizing myostatin, FS-344 removes this “brake” on muscle growth, leading to the activation of pathways that increase both the size (hypertrophy) and number (hyperplasia) of muscle fibers .

Q3: What is the role of Follistatin 344 in metabolism?

A: Research shows that follistatin can induce the browning of white adipose tissue and improve metabolic markers like leptin and adiponectin . This makes it a key tool in obesity and diabetes research for studying how inhibiting the myostatin/activin pathway can increase energy expenditure and improve metabolic health.

Q4: How do I verify the quality of your Follistatin 344?

A: We are committed to transparency. Our product listings provide access to documentation confirming purity via SDS-PAGE or HPLC (>95%) and low endotoxin levels, consistent with industry standards for research-grade proteins .

Q5: What is the correct way to reconstitute and store Follistatin 344 to maintain its activity?

A: Briefly centrifuge the vial, then reconstitute in sterile water or PBS (0.1-1.0 mg/mL) by gently swirling—do not vortex . For long-term storage of the reconstituted protein, it is critical to aliquot into single-use vials and freeze at -20°C or below, ideally with a carrier protein like 0.1% BSA, to prevent activity loss from freeze-thaw cycles .

📦 Our Services & Guarantees

• 24/7 Customer Support: Our team is available to answer your pre- and post-sales questions.
• Authenticity Guarantee: We guarantee that you receive the exact product described, with full documentation and lot matching.
• Product Replacement: In the unlikely event of damage during shipping, we have a clear process for claims and replacement.
• Technical Consultation: Contact us for assistance with reconstitution or handling protocols.

🚀 How to Buy Follistatin 344 Peptide Online

Purchasing from buypeptidesonlineusa.com is simple and secure.

1. Browse & Select: Choose the quantity you need (e.g., 500µg, 1mg, 5mg vial).
2. Add to Cart: Proceed to our secure checkout.
3. Payment: We accept major credit cards and cryptocurrency (Bitcoin, Ethereum, USDT) for privacy and convenience.
4. Shipping: Orders are processed within 24 hours on business days and shipped in discreet, temperature-controlled packaging. Domestic orders typically arrive in 2-5 days.

Ready to advance your research into muscle growth and metabolism? Add high-purity, bioactive Follistatin 344 to your cart today.