Description

Technical Parameters

Introduction

Follistatin 3442

Factory 2

musclepic 2

Products Description

1. Classification and Structural Characteristics

From a structural and functional perspective, follistatin is mainly classified into two common forms: follistatin 288 and follistatin 344. The main difference lies in the length of the C-terminal sequence and their tissue distribution characteristics. Follistatin 288 has a stronger local binding capacity and is mostly found on the cell surface or in local tissues, while follistatin 344, due to its additional amino acid extension, exhibits higher blood circulation stability and systemic biological activity, making it more suitable for exogenous supplementation and systemic effects.

In industrial applications, FS344 powder can be divided into three main categories based on its intended use and purity requirements:

Research Grade Powder: Purity is generally 95%–98%, used for in vitro experiments, cell culture, and animal model research;

Pharmaceutical Grade Powder: Purity ≥99%, conforming to GMP standards, used for preclinical or formulation development;

Biotech Performance Grade Powder: Primarily used in non-medical products, such as muscle-building peptide supplements and anti-aging formulations, with purity controlled above 97%, and rigorously tested for endotoxin residue.

2. Physicochemical Properties

Follistatin 344 is a glycoprotein polypeptide with a molecular weight of approximately 38.0 kDa. Its theoretical isoelectric point (pI) is approximately 4.5–5.0, and it contains disulfide bonds formed by multiple cysteine residues, ensuring the protein's tertiary structural stability. The following are its main physicochemical characteristics:

Appearance and Color: High-quality Follistatin 344 raw material powder is a white to off-white lyophilized powder, lightweight and hygroscopic; low-purity samples may appear pale yellow or grayish-white.

Solubility: Soluble in distilled water, physiological saline, or weakly acidic buffers (such as acetate buffer at pH 5.5), but repeated freeze-thaw cycles should be avoided to prevent loss of activity.

Stability: Stable for more than 12 months in the lyophilized state at -20°C; after dissolution, it should be stored refrigerated and protected from light, and short-term use is recommended.

Purity Indicators: The peak area ratio of high-purity samples detected by HPLC should be ≥99%, and molecular integrity can be verified by mass spectrometry (MS) and SDS-PAGE.

pH Adaptability: Maintains structural stability within the pH range of 4–7; extreme acidic or alkaline environments may lead to conformational denaturation or peptide chain breakage.

3. Biological Mechanism and Mechanism of Action

The main physiological mechanism of action of Follistatin 344 lies in its antagonistic effect on myostatin, a muscle growth inhibitor. Myostatin belongs to the TGF-β superfamily and is an important negative regulator of skeletal muscle growth. When follistatin binds to myostatin, it blocks myostatin's binding to its receptor ActRIIB, thereby relieving the inhibitory signal on muscle cell differentiation and growth. The result is an increase in muscle fiber diameter and muscle cell number, leading to improved muscle mass.

Furthermore, follistatin 344 can also bind to Activin A/B, thereby playing a regulatory role in the function of the reproductive system, insulin secretion, inflammatory responses, and tissue repair. In animal experiments, exogenous supplementation with FS344 significantly increased the rate of skeletal muscle protein synthesis, accelerated damage repair, and indirectly affected fat metabolism, exhibiting a dual effect of decreasing body fat percentage and increasing muscle mass.

4. Advantages and Applications

Potential Muscle-Boosting Effect: FS344 inhibits the Myostatin signaling pathway, keeping muscle cells in a state of continuous growth. Multiple experiments have shown that animal models using Follistatin 344 can achieve a 20%–30% increase in muscle cross-sectional area within 4 weeks.

High Specificity and Low Toxicity: Unlike traditional anabolic hormones (such as testosterone and Nandrolone), FS344 is a natural protein derivative that does not act through the androgen receptor pathway, avoiding the side effects of hormones such as hepatotoxicity, hormonal imbalance, or endocrine disorders.

Good Tissue Compatibility: As it is a form of mammalian endogenous protein, exogenous supplementation results in extremely low immune rejection, making it suitable for organisms in various physiological states.

Anti-inflammatory and Repair Capabilities: Follistatin can inhibit the release of inflammatory factors and promote the activation and regeneration of muscle stem cells during injury repair, aiding in rapid recovery after exercise.

High Application Flexibility

FS344, existing in powder form, can be used in various forms such as injectable formulations, sustained-release carriers, and nanodelivery systems, facilitating research and product development.

5. Production and Preparation

Currently, high-quality Follitatin 344 is mostly prepared using recombinant expression technology. A common production route is as follows:

Using mammalian cells (such as CHO cells) or yeast systems as expression hosts;

Inserting the gene into an expression vector containing the FS344 coding sequence via gene cloning;

Expressing the protein under controlled fermentation conditions;

Subsequently, removing impurities and endotoxins through multiple steps of purification, including affinity chromatography, ion exchange chromatography, and molecular sieve filtration;

Finally, obtaining a stable white powder through lyophilization.

Strict control of production conditions ensures high purity and high activity of the product, avoiding activity reduction caused by differences in glycosylation or abnormal structural folding.

6. Quality Identification and Testing

The testing items for high-quality Follitatin 344 include:

Appearance and Color: White to off-white powder, with no obvious odor.

Purity testing: Analyze using HPLC, SEC-HPLC, or CE-SDS; purity should be ≥98%.

Molecular identification: Confirm the molecular weight is consistent with the theoretical value using mass spectrometry (MALDI-TOF MS).

Bioactivity assay: Assess its activity using Activin/Myostatin competitive binding assays or cell proliferation assays.

Sterility and endotoxin testing: Meets pharmacopoeia standards; endotoxin limit <0.1 EU/μg.

7. Storage and Stability

Follistatin 344 exhibits high stability in its lyophilized powder state. Recommended storage conditions are as follows:

Temperature: Store long-term below -20°C;

Humidity: ≤30%, avoid moisture absorption;

Light: Store away from light to prevent UV degradation;

Reconstitute before use with sterile water for injection or buffer solution, aliquot, and refrigerate (2–8°C), avoiding repeated freeze-thaw cycles.

Good storage conditions can significantly extend the product's shelf life and maintain its bioactivity.

8. Application Prospects

Follistatin 344 has extremely broad application prospects, not limited to the fitness and sports field. In medical research, it is considered a potential candidate drug for treating muscular dystrophy (such as Duchenne muscular dystrophy and sarcopenia in the elderly); in metabolic diseases, the effects of FS344 on improving insulin sensitivity and energy metabolism are also being explored. Furthermore, it shows promising potential in anti-aging medicine, skin regeneration, and tissue engineering.

With the maturation of biopeptide technology, Follistatin 344 is expected to be developed into a highly effective and safe muscle-enhancing and rehabilitation adjuvant, providing more solutions for future precision medicine.

9. Conclusion

As a high-quality, highly active peptide, Follistatin 344 exhibits unique advantages in molecular design, physicochemical properties, stability, and physiological effects. It not only has significant value in scientific research and clinical fields but is also considered a representative of "next-generation bio-enhancing peptides" in the sports and health industry.

A systematic understanding of its structure, properties, and application principles is key to driving its transition from the laboratory to industrialization. High-quality FS344 raw material powder should have high purity, high stability, and traceable production process. Only under strict quality control and scientific application can Follistatin 344 truly unleash its enormous potential in promoting muscle growth, repairing tissues, and delaying aging.