TB-500 (Thymosin Beta-4 Fragment) Overview

TB-500 is a synthetic peptide based on a fragment of thymosin beta-4 (Tβ4), a naturally occurring 43-amino-acid actin-binding protein found in high concentrations in mammalian tissues. Thymosin beta-4 has been extensively studied for its role in cell migration, tissue repair, angiogenesis, and inflammation regulation. TB-500 is commonly used in research as a shorter functional analog designed to explore similar biological pathways in laboratory settings.

Tissue Repair and Regenerative Research

Promotion of Cell Migration and Actin Regulation

Thymosin beta-4 plays a central role in actin sequestration, a process critical for cell movement and structural reorganization during tissue repair. By regulating actin dynamics, Tβ4 facilitates the migration of endothelial cells, keratinocytes, and fibroblasts to sites of injury—an essential step in wound healing and regeneration.

Supported by:
Goldstein et al., FASEB Journal; Smart et al., Nature

Enhancement of Soft Tissue Healing

Preclinical studies have shown that thymosin beta-4 accelerates healing in skin, muscle, tendon, and corneal injury models. These effects include faster wound closure, improved tissue organization, and reduced fibrosis. While most data involve full-length Tβ4, TB-500 is studied as a functional fragment intended to probe similar repair mechanisms.

Supported by:
Malinda et al., Journal of Investigative Dermatology; Sosne et al., Investigative Ophthalmology & Visual Science

Angiogenesis and Vascular Support

Stimulation of New Blood Vessel Formation

Thymosin beta-4 has been shown to promote angiogenesis by enhancing endothelial cell migration and survival. In ischemic and injury models, increased vascularization improves oxygen and nutrient delivery, supporting tissue recovery and remodeling.

Supported by:
Smart et al., Nature; Bock-Marquette et al., Journal of Molecular and Cellular Cardiology

Anti-Inflammatory and Cytoprotective Effects

Modulation of Inflammatory Signaling

Experimental studies indicate that thymosin beta-4 can reduce inflammatory cytokine signaling and limit secondary tissue damage following injury. These anti-inflammatory effects are thought to support a healing environment rather than suppress normal immune responses.

Supported by:
Philp et al., Annals of the New York Academy of Sciences

Neuroprotective and Organ-Protective Research

Protection in Neural and Organ Injury Models

Preclinical research has explored thymosin beta-4’s protective effects in models of central nervous system injury, myocardial ischemia, and organ damage. Findings include reduced apoptosis, improved cell survival, and enhanced regenerative signaling. These effects remain investigational and are primarily derived from animal and cell studies.

Supported by:
Morris et al., Experimental Neurology; Smart et al., Nature

TB-500 Peptide Specifications

• Common Name: TB-500

• Related Molecule: Thymosin beta-4 (Tβ4)

• Peptide Class: Synthetic peptide fragment (research analog)

• Form: Lyophilized powder in sterile glass vial

• Purity: ≥98% (research grade)

• Color: White to off-white powder

• Storage: Refrigerate after reconstitution

(Note: TB-500 is not identical to full-length thymosin beta-4; most mechanistic and biological data are derived from studies of Tβ4.)

Important Notice

TB-500 is intended solely for in vitro laboratory research by qualified professionals. It is not approved by the U.S. Food and Drug Administration (FDA) for human or veterinary use and must not be marketed, labeled, or represented as a drug, dietary supplement, cosmetic, or food product.

References

1. Goldstein AL, Kleinman HK. Thymosin beta-4: actin-sequestering protein regulating cell migration and tissue repair. FASEB Journal.
   https://faseb.onlinelibrary.wiley.com/doi/10.1096/fj.01-0846rev

2. Smart N, et al. Thymosin beta-4 induces adult epicardial progenitor mobilization and neovascularization.Nature.
   https://www.nature.com/articles/nature08446

3. Malinda KM, et al. Thymosin beta-4 accelerates wound healing. Journal of Investigative Dermatology.
   https://pubmed.ncbi.nlm.nih.gov/11895414/

4. Sosne G, et al. Thymosin beta-4 promotes corneal wound healing. Investigative Ophthalmology & Visual Science.
   https://pubmed.ncbi.nlm.nih.gov/15671278/

5. Bock-Marquette I, et al. Thymosin beta-4 activates integrin-linked kinase and promotes angiogenesis. Journal of Molecular and Cellular Cardiology.
   https://pubmed.ncbi.nlm.nih.gov/16780813/

6. Philp D, et al. Thymosin beta-4 and tissue protection. Annals of the New York Academy of Sciences.
   https://pubmed.ncbi.nlm.nih.gov/12803674/

7. Morris DC, et al. Thymosin beta-4 improves functional recovery after experimental stroke. Experimental Neurology.
   https://pubmed.ncbi.nlm.nih.gov/18054904/

8. Sosne G, Kleinman HK. Thymosin beta-4: structure, function, and therapeutic potential. Expert Opinion on Biological Therapy.
   https://pubmed.ncbi.nlm.nih.gov/15757399/

Complete Disclaimer

This product is sold exclusively for laboratory research purposes under Section 351 of the Public Health Service Act. It is not intended for human or veterinary use, nor for diagnostic, therapeutic, or cosmetic applications. Purchaser certifies they are properly licensed and equipped to handle research compounds in compliance with all local, state, and federal regulations. EaglePeptidesUSA assumes no liability for misuse or unauthorized handling. By purchasing, you affirm this material will not be introduced into interstate commerce or used in food/drug products.