Description
Molecular Characteristics
Structure: A synthetic analog of the N-terminal acetylated 17–23 fragment of Tβ4.
Molecular Formula: C38H68N10O14
Molecular Weight: Approximately 889.02 Da.
Sequence: Ac-LKKTETQ.
Biological Mechanisms
Preclinical research suggests TB-500 mimics several functions of its parent molecule, Tβ4, primarily through actin regulation:
Actin Sequestration: Binds to G-actin monomers, preventing their polymerization into F-actin. This increases cellular motility, allowing repair cells to migrate to injury sites.
Angiogenesis: Promotes the formation of new blood vessels by upregulating VEGF (Vascular Endothelial Growth Factor) expression.
Anti-inflammatory Effects: Reduces pro-inflammatory cytokines like TNF-α , IL-1β, and IL-6.
Metabolic Insights: Research published in 2024 suggests that TB-500 itself may not be the primary active agent for wound healing; instead, its metabolite Ac-LKKTE showed significant activity in fibroblast experiments, while the parent form did not.
Evidence for Efficacy (Preclinical)
Most data comes from animal models (mice, rats, and horses):
Wound Healing: Accelerated closure rates by 40–55% in diabetic and aged mouse models.
Tendon/Ligament Repair: Increased tensile strength and improved functional recovery in rat Achilles tendon and rotator cuff models.
Cardiovascular: Reduced infarct size and improved left ventricular function in mouse coronary ligation models.
Safety and Regulatory Status
Human Data: There are zero completed large-scale human clinical trials specifically for TB-500. Most human-facing data is extrapolated from Thymosin Beta-4 trials, which showed safety in Phase II for cardiac and ocular use but are not identical to TB-500.
Banned Substance: Prohibited by the World Anti-Doping Agency (WADA) under category S0 (Non-Approved Substances).
Risks: Potential concerns include oncogenic risk (angiogenesis could theoretically promote tumor growth), immune sensitization, and product quality issues (contaminants like endotoxins) in the unregulated market.
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