TB-500 (Thymosin Beta-4) (43aa)

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The Master Regulator of Actin Dynamics: An Introduction to TB-500 (Thymosin Beta-4) 🔬

For researchers focused on the frontiers of regenerative medicine, wound healing, and tissue repair, TB-500 (Thymosin Beta-4) stands as one of the most extensively studied and clinically significant peptide compounds in modern biomedical research. This synthetic 43-amino acid peptide is identical to the naturally occurring thymosin beta-4 (Tβ4), a highly conserved polypeptide found in virtually all human and animal cells, with particularly high concentrations in platelets, macrophages, and wound healing tissues .

TB-500's significance in research stems from its unique mechanism as the primary intracellular G-actin sequestering peptide . By binding to and sequestering monomeric G-actin, thymosin beta-4 regulates the pool of actin available for polymerization, thereby controlling cytoskeletal dynamics essential for cell migration, adhesion, and differentiation . Beyond its intracellular role, extracellular thymosin beta-4 contributes to critical physiological processes including angiogenesis, wound healing, and regulation of inflammation .

A very recent 2024 study published in the Journal of Chromatography B has shed new light on TB-500's metabolism, revealing that its previously reported wound-healing activity may be attributable to its metabolite Ac-LKKTE rather than the parent form . This finding opens new avenues for research into the peptide's mechanism and potential therapeutic applications.

What is TB-500 (Thymosin Beta-4)?

TB-500 is a synthetic 43-amino acid peptide with the sequence Ac-Ser-Asp-Lys-Pro-Asp-Met-Ala-Glu-Ile-Glu-Lys-Phe-Asp-Lys-Ser-Lys-Leu-Lys-Lys-Thr-Glu-Thr-Gln-Glu-Lys-Asn-Pro-Leu-Pro-Ser-Lys-Glu-Thr-Ile-Glu-Gln-Glu-Lys-Gln-Ala-Gly-Glu-Ser-OH . Its molecular formula is C₂₁₂H₃₅₀N₅₆O₇₈S with a molecular weight of approximately 4963.44 Da . It is identified by CAS number 77591-33-4 .

Its primary mechanisms of action, established through extensive research, include:

1. Actin Sequestration and Cytoskeletal Regulation: Thymosin beta-4 is the main intracellular G-actin sequestering peptide. By binding to monomeric actin, it maintains a pool of unpolymerized actin required for rapid filament elongation and cellular motility . This regulation is fundamental to cell migration, which is essential for wound healing and tissue regeneration .
2. Angiogenesis Promotion: TB-500 demonstrates potent angiogenic properties through multiple mechanisms, including stimulation of endothelial cell migration, proliferation, and tube formation. It upregulates expression of various angiogenic factors and promotes formation of new capillary networks, which are essential for adequate tissue perfusion during healing processes .
3. Cell Migration and Wound Healing: The peptide facilitates cellular migration and morphological changes essential for wound healing and tissue repair through its ability to modulate cytoskeletal organization . A 2024 study confirmed that the metabolite Ac-LKKTE shows significant wound healing activity .
4. Anti-Inflammatory Effects: TB-500 modulates cytokine production and promotes inflammatory resolution pathways. It appears to shift macrophage polarization from pro-inflammatory M1 phenotypes toward anti-inflammatory M2 phenotypes, thereby facilitating tissue repair and regeneration .
5. Cardioprotective and Neuroprotective Properties: Research has demonstrated that TB-500 preserves cardiac muscle viability following ischemic injury and promotes cardiac muscle regeneration. The peptide also exhibits neuroprotective properties and may facilitate neural regeneration through enhancement of axonal growth and synaptic plasticity .

🔬 Primary Research Focuses and Applications

The TB-500 Peptide is at the forefront of multiple cutting-edge research areas, validated by numerous peer-reviewed studies including a very recent 2024 publication:

• Metabolism and Active Metabolite Research (2024 Study): A landmark 2024 study published in the Journal of Chromatography B investigated the metabolism of TB-500 in human serum, various in-vitro enzyme systems, and urine samples from treated rats. The study identified Ac-LK as the primary metabolite with the highest concentration in rats, while Ac-LKK was detected as a long-term metabolite up to 72 hours. Importantly, the metabolite Ac-LKKTE demonstrated significant wound healing activity, suggesting that the previously reported effects of TB-500 may be attributable to this metabolite rather than the parent form .

• Wound Healing and Tissue Regeneration Research: TB-500 is extensively studied for its ability to promote healing across multiple tissue types, including skin, muscle, tendons, and ligaments. Research demonstrates that it enhances cellular migration, promotes angiogenesis, and modulates inflammation to accelerate healing . The peptide is naturally produced in higher concentrations where tissue has been damaged .

• Musculoskeletal and Tendon Research: TB-500 has demonstrated particular efficacy in preclinical models of tendon and ligament repair. Studies indicate improved healing quality, enhanced tensile strength, better collagen organization, and reduced scar tissue formation. The peptide's effects on cellular migration and angiogenesis contribute to these benefits .

• Cardiovascular and Cardiac Protection Research: Preclinical investigations have demonstrated TB-500's cardioprotective effects in models of myocardial injury. The peptide may help preserve cardiac muscle viability following ischemic injury, attenuate scar tissue formation after myocardial infarction, and promote neovascularization within ischemic cardiac tissue .

• Ophthalmology and Corneal Repair Research: TB-500 has been studied for its ability to promote healing in corneal tissues, leveraging its angiogenic and cell migration properties .

🧪 Product Specifications & Technical Data

At Buy Peptides Online USA, we ensure your research is built on a foundation of quality and consistency. This peptide is manufactured to rigorous laboratory standards and verified through advanced analytical methods.

✅ Why Choose Buy Peptides Online USA for Your Research?

Sourcing reliable research compounds is critical for reproducible, high-impact science. Here is why discerning researchers across the USA trust us:

• Verified Purity & Potency: We provide access to Certificates of Analysis (COA) and rely on advanced analytical methods like High Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS) to confirm the identity and purity (≥99%) of every batch . This commitment ensures the integrity of your experimental data.
• Research-Focused Integrity: We strictly adhere to research-use-only (RUO) guidelines. Our product descriptions are factual, focusing on chemical properties and cited research applications, never unverified human-use claims. This product is not for diagnostic or therapeutic use .
• Fast & Discreet USA Shipping: As a USA-based supplier, we offer fast, reliable shipping across the United States with discreet packaging to ensure your order arrives safely, professionally, and on time for your critical research timelines. Enjoy free shipping on orders over $300.
• Expert Support & Authenticity Guarantee: Our team provides technical consultation to support your work. We stand behind the authenticity and quality of all our products, offering a product replacement service and clear complaint handling.

📝 Handling, Storage, & Important Safety Information

• Critical Storage Information: Upon receipt, store the lyophilized powder at -20°C (-4°F) or below, desiccated, protected from light and moisture. Although stable at room temperature for up to 3 weeks, long-term storage requires freezing below -18°C . The lyophilized powder is stable for up to 3 years at -20°C.
• Handling for Research Use: This product is for laboratory use only by qualified professionals. Before opening, allow the vial to warm to room temperature and briefly centrifuge to concentrate material at the bottom. Reconstitute in sterile 18MΩ-cm H₂O at a concentration not less than 100 µg/ml . Gently invert to mix; do not vortex.
• Stability Considerations: Once reconstituted, store at 4°C for 2-7 days. For long-term storage, freeze below -18°C. Adding a carrier protein such as 0.1% HSA or BSA is recommended for extended stability . Avoid repeated freeze-thaw cycles at all costs, as this can degrade the peptide.
• TFA Salt Information: Peptides often contain trifluoroacetic acid (TFA) salt from the HPLC purification process. TFA contributes to total mass (peptide content typically >80% of total weight) and generally enhances solubility in aqueous solutions . For most standard in vitro assays, residual TFA levels do not cause interference.
• Safety Considerations: TB-500 is a potent, bioactive peptide for research use only. Its potential proangiogenic activity underscores the importance of careful experimental design . Always wear appropriate personal protective equipment (PPE), including lab coats, safety glasses, and nitrile gloves. Work in a laminar flow hood or well-ventilated area.
• Warning: This product is not for human or veterinary use. It is not a drug, food, or cosmetic. Not for human consumption or diagnostic use . For laboratory research only.

❓ Frequently Asked Questions (FAQs)

Q: What is the primary mechanism of action for TB-500?

A: TB-500 (thymosin beta-4) is the main intracellular G-actin sequestering peptide, regulating the pool of monomeric actin required for rapid filament elongation and cellular motility . It also promotes angiogenesis, cell migration, wound healing, and modulates inflammation .

Q: What is the structure of TB-500?

A: TB-500 is a 43-amino acid synthetic peptide with the sequence Ac-Ser-Asp-Lys-Pro-Asp-Met-Ala-Glu-Ile-Glu-Lys-Phe-Asp-Lys-Ser-Lys-Leu-Lys-Lys-Thr-Glu-Thr-Gln-Glu-Lys-Asn-Pro-Leu-Pro-Ser-Lys-Glu-Thr-Ile-Glu-Gln-Glu-Lys-Gln-Ala-Gly-Glu-Ser-OH. Its molecular weight is approximately 4963.44 Da, and its CAS number is 77591-33-4 .

Q: What are the most recent research findings on TB-500 (2024)?

A: A landmark 2024 study published in the Journal of Chromatography B investigated TB-500's metabolism, identifying Ac-LK as the primary metabolite and Ac-LKK as a long-term metabolite (detectable up to 72 hours). Crucially, the metabolite Ac-LKKTE demonstrated significant wound healing activity, suggesting that the previously reported effects of TB-500 may be due to this metabolite rather than the parent form .

Q: What research applications is TB-500 commonly used for?

A: TB-500 is extensively studied in wound healing and tissue regeneration, musculoskeletal repair (tendons, ligaments, muscle) , cardiovascular protection (myocardial infarction, cardiac regeneration) , angiogenesis , and inflammation modulation .

Q: What is the difference between TB-500 and Thymosin Beta-4?

A: TB-500 is a synthetic analogue of the naturally occurring 43-amino acid peptide thymosin beta-4 (Tβ4) . The terms are often used interchangeably in research contexts, as TB-500 is designed to replicate the biological activity of the endogenous protein.

Q: How do you verify the purity and identity of TB-500?

A: We ensure every batch is rigorously analyzed using High Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS) . HPLC confirms a purity level of ≥99% , while Mass Spectrometry verifies the precise molecular weight (~4963.44 Da) , ensuring the correct peptide structure and identity. Certificates of Analysis (COA) are available upon request.

Q: What are the critical storage conditions for TB-500?

A: Store the lyophilized powder at -20°C (-4°F) or below, desiccated and protected from light and moisture . Once reconstituted, store at 4°C for 2-7 days. For longer storage, freeze below -18°C, preferably with a carrier protein (0.1% HSA or BSA) . Avoid repeated freeze-thaw cycles.

Q: Is TB-500 prohibited in sports research?

A: Yes, researchers should be aware that TB-500, as a peptide hormone and growth factor modulator, would be considered a prohibited substance under the general category of peptide hormones and growth factors on the World Anti-Doping Agency (WADA) Prohibited List . It is intended for legitimate scientific research only.

Ready to Advance Your Research? 🚀

Equip your laboratory with a cornerstone peptide for studying actin dynamics, angiogenesis, and tissue regeneration, now informed by the latest 2024 metabolic findings. Order the high-purity TB-500 (Thymosin Beta-4) (43aa) today from Buy Peptides Online USA. Benefit from our fast USA shipping, secure payments (including crypto), and the confidence that comes from rigorously tested, research-grade compounds. For any questions about this product or your order, our support team is here to provide technical consultation.