TB-500
TB-500 — A synthetic fragment of thymosin beta-4, a 43-amino acid protein involved in cell migration, differentiation, and anti-inflammatory signaling in research models.
What Is TB-500?
TB-500 is a synthetic analog of the naturally occurring 43-amino acid peptide thymosin beta-4. Specifically, TB-500 represents the active region of thymosin beta-4, focusing on the actin-binding domain (amino acids 17-23, sequence LKKTETQ) that is responsible for many of the peptide's observed biological effects.
With a molecular weight of approximately 4963 Da, TB-500 is larger than many commonly studied research peptides. It is supplied as a lyophilized powder and reconstituted in bacteriostatic water for research use.
Mechanism of Action
TB-500's primary mechanism involves sequestering G-actin (globular actin) monomers, which promotes actin polymerization at the cell's leading edge. This process directly influences cell migration, a critical step in wound repair and tissue regeneration. By increasing actin polymerization, TB-500 enhances cellular motility and the formation of new blood vessels (angiogenesis).
Additionally, TB-500 has been shown to upregulate several cell-surface receptors involved in the inflammatory response, including CCR2 and CXCR4. These interactions may explain its observed anti-inflammatory properties in preclinical models.
Research Applications
TB-500 has been investigated across multiple research domains:
- Wound healing: Studies have demonstrated accelerated dermal wound closure and hair follicle stem cell migration in murine models
- Cardiac repair: Research has shown reduced scar formation and improved cardiac function following myocardial infarction in rodent models
- Neurological research: TB-500 has shown neuroprotective effects and promotion of oligodendrocyte differentiation in central nervous system injury models
- Inflammation: The peptide has demonstrated anti-inflammatory effects through modulation of cytokine expression in cell culture systems
TB-500 vs. Thymosin Beta-4
While TB-500 and thymosin beta-4 are often discussed interchangeably, they are distinct molecules. Full-length thymosin beta-4 contains 43 amino acids, while TB-500 is a shorter synthetic fragment. Both contain the active LKKTETQ sequence, but their pharmacokinetic profiles, bioavailability, and receptor interactions may differ due to the structural differences.
Handling and Storage
Store lyophilized TB-500 at -20°C with desiccant. Reconstitute with bacteriostatic water, injecting slowly along the vial wall. The reconstituted solution should be refrigerated (2-8°C) and used within 21 days. Due to its larger molecular weight, TB-500 may take longer to dissolve than smaller peptides. Allow 5-10 minutes of gentle swirling rather than aggressive mixing.
Frequently Asked Questions
What is TB-500?
A synthetic fragment of thymosin beta-4, a 43-amino acid protein involved in cell migration, differentiation, and anti-inflammatory signaling in research models.
Why is TB-500 important in peptide research?
TB-500 is a fundamental concept in compound as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.