Thymosin Beta 4

COMPOUND OVERVIEW

Thymosin Beta 4 (TB500, Tβ4) is a 43-amino acid protein encoded by the TMSB4X gene and found in virtually all human tissues and cells. It is one of the most abundant intracellular proteins in mammals, serving as the primary G-actin sequestering agent in the cytoplasm. Beyond its actin regulatory role, Thymosin Beta 4 has been identified as a critical mediator of wound healing, angiogenesis, and tissue repair. It promotes cell migration, survival, and differentiation through activation of integrin signaling and the PI3K/Akt pathway. Research on TB500 has spanned cardiac regeneration, neural repair, tendon healing, skin repair, and anti-inflammatory modulation.

MECHANISM OF ACTION

TB500 binds G-actin monomers via its LKKTET actin-binding domain, regulating the dynamics of the actin cytoskeleton in migrating cells — a critical step in wound closure and tissue infiltration. Its biological effects extend well beyond actin regulation: TB500 promotes angiogenesis by upregulating VEGF expression, activates Akt-mediated cell survival pathways, and modulates matrix metalloproteinase activity for extracellular matrix remodeling. In cardiac research models, it has been shown to activate epicardial progenitor cells, promote cardiomyocyte survival, and reduce post-injury fibrosis. Its anti-inflammatory effects are mediated through down-regulation of NF-kB and pro-inflammatory cytokine expression.

RESEARCH APPLICATIONS

• Wound healing and skin tissue repair research
• Cardiac repair and cardiomyocyte protection research
• Tendon, ligament, and muscle regeneration studies
• Angiogenesis and VEGF-mediated vasculogenesis research
• Neural protection and recovery research models
• Anti-inflammatory pathway modulation studies
• Actin cytoskeleton dynamics and cell migration research

KEY RESEARCH FINDINGS

• Cardiac research demonstrates TB500 activates epicardial progenitor cells and promotes cardiomyocyte regeneration following infarction in mouse models
• Wound healing studies show significantly accelerated closure rates and improved tensile strength in skin wound models
• Neural research demonstrates axon guidance and peripheral nerve repair enhancement with TB500 administration
• Angiogenesis studies confirm VEGF upregulation and capillary formation in multiple tissue injury models
• Tendon repair studies show TB500 promotes tenocyte proliferation and collagen synthesis in vitro
• Anti-inflammatory research confirms TB500 down-regulates IL-1β and TNF-α in macrophage cell cultures

STORAGE & HANDLING

• Store lyophilized at -20°C; stable for up to 24 months
• Reconstitute with bacteriostatic water; use within 28 days at 2–8°C
• Protect from heat and UV light
• Avoid repeated freeze-thaw cycles after reconstitution
• Handle with sterile technique; subcutaneous research administration is common in preclinical protocols

SPECIFICATIONS

DISCLAIMER: This compound is sold strictly for laboratory and research purposes only. It is not intended for human consumption, clinical use, or veterinary application. These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease. For use by licensed researchers and qualified professionals only. You must be 21 years of age or older to purchase.

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