Overview
In plain English
TB-500 is a synthetic form of thymosin beta-4, the principal G-actin sequestering peptide in mammalian cells and one that is released at sites of tissue injury.
It is studied in published research for cell migration, cytoskeletal remodelling and wound repair in animal models. It is often examined alongside BPC-157 because the two act on different parts of the repair process. Strictly for laboratory research use. Not for human or veterinary consumption.
- What it isA synthetic form of thymosin beta-4
- Mainly studied forCell migration, cytoskeletal remodelling and wound repair models
- Supplied asLyophilised powder, 10mg vial, independently assayed
How it works
What it actually does
When tissue is damaged, repair cells have to physically migrate into the wound. To do that they continuously rebuild their internal actin scaffolding.
Thymosin beta-4 is the cell's main regulator of the raw material for that scaffolding. It holds a reserve of actin monomer on standby so cells can polymerise it quickly and in the right direction.
That is why the research theme is cell movement and remodelling rather than blood supply — the opposite end of the repair process from BPC-157.
The science in detail
Thymosin beta-4 is a 43-residue, intrinsically disordered peptide and the principal G-actin sequestering protein in mammalian cells. Its defining function is stoichiometric: it binds monomeric G-actin in a 1:1 complex and holds it in an unpolymerisable state. This creates a buffered reservoir of actin monomer that the cell can release on demand, allowing rapid, localised polymerisation of F-actin at the leading edge during migration. The actin-binding activity localises to a central motif, the heptapeptide LKKTETQ, which is why "TB-500" is frequently described as a fragment-based construct rather than the intact protein — a distinction buyers should confirm against the batch assay, since commercial material varies.
The functional consequence of actin buffering is control over cell motility. Cells that must migrate into a wound bed — endothelial cells, keratinocytes, fibroblasts — depend on the ability to rapidly reorganise the cytoskeleton, and thymosin beta-4 sits directly on that control point. Malinda et al. (Journal of Investigative Dermatology, 1999) reported accelerated dermal wound repair with increased keratinocyte migration and collagen deposition in rodent models.
A second, distinct mechanism operates through enzymatic processing. The N-terminal tetrapeptide Ac-SDKP is liberated from thymosin beta-4 by prolyl oligopeptidase and by meprin-α, and this fragment has independent anti-fibrotic and anti-inflammatory activity in its own right — studied, for example, in bleomycin models of pulmonary fibrosis. The parent peptide therefore functions partly as a precursor.
In cardiac tissue, Bock-Marquette et al. (Nature, 2004) reported that thymosin beta-4 activates integrin-linked kinase and promotes cardiomyocyte migration and survival after injury, a pathway independent of the actin-sequestering role.
This is the contrast with BPC-157. TB-500's principal described actions are intracellular and cytoskeletal; BPC-157's are extracellular and vascular, centring on VEGFR2 and nitric oxide signalling. The mechanisms do not overlap, which is why the two are commonly studied together.
Evidence
What the research shows
Controls how repair cells move
It regulates the actin scaffolding cells use to migrate into a wound — the step that sets how fast repair starts.
Faster dermal repair in animal models
Rodent wound studies reported quicker closure, more cell migration and more collagen deposition.
Different mechanism to BPC-157
BPC-157 acts outside the cell on blood supply; TB-500 acts inside the cell on movement. That is why they are commonly studied together.
Studied in cardiac tissue too
Published work has examined its role in cardiac repair signalling, separate from the wound-healing research.
Reconstitution & handling
Reconstitution and handling in the laboratory
These are general handling notes for the lyophilised peptide supplied by Purist Peptides. They describe the preparation of a stock solution for laboratory work. They are not a dosing protocol, and they describe no administration to a person or an animal.
A 3ml vial of bacteriostatic water is included free with every peptide vial you order, so the material can be reconstituted on arrival.
TB-500 10mg — preparing a stock solution
Choice of diluent
Bacteriostatic water (water for injection with 0.9% benzyl alcohol) is the usual diluent where a stock will be drawn from repeatedly, because the preservative permits several septum entries across a working period. Sterile water for injection and sterile 0.9% sodium chloride are both used where a single-use preparation is wanted instead. The diluent volume sets the concentration of the stock, so record it.
Sterile technique
- Allow the sealed vial to reach room temperature before opening the carton — reconstituting a cold lyophilised cake slows dissolution
- Work in a clean area or a laminar flow cabinet, and wipe the rubber septum with 70% isopropyl alcohol, letting it dry fully
- Draw the chosen volume of diluent using a sterile single-use syringe and needle
- Angle the needle so the diluent runs down the inside wall of the vial — do not direct the stream onto the lyophilised cake
- Roll the vial gently between the palms until the cake has dissolved completely. Do not shake and do not vortex: peptides are surface-active, and agitation drives foaming and aggregation
- Let the vial stand for 5 to 10 minutes. A correctly reconstituted solution is clear and free of visible particles
Working out the concentration
Concentration follows from the mass in the vial and the volume of diluent added, nothing else. Adding 2ml of diluent to the 10mg vial gives a 5mg/ml stock; adding 1ml gives 10mg/ml. Label every reconstituted vial with its concentration and the date it was prepared.
Storage and stability
Before reconstitution
The lyophilised powder is the stable form. Sealed vials are best held at −20°C, protected from light and from moisture; the short periods at 2 to 6°C that occur in transit and on arrival are expected and are accounted for in the supply chain. Keep the vial in its carton — light and humid air are the two ordinary causes of loss on storage.
After reconstitution
Hold reconstituted solution at 2 to 6°C and protect it from light. Do not freeze a working stock: freeze-thaw cycling is the main avoidable cause of degradation and of visible precipitate. Where material must be held beyond a short working period, aliquot the stock into sterile low-binding tubes and freeze the aliquots once at −20°C or below, thawing each aliquot only once.
Checks before use
Inspect every vial against a light source. Discard any solution that is hazy, discoloured or contains particles, and any vial whose septum integrity is in doubt. The independent HPLC assay report for the batch supplied is available on request.
Strictly for laboratory research use. Not for human or veterinary consumption.
Questions
Frequently asked questions
Is TB-500 the same thing as thymosin beta-4?
Not necessarily. Thymosin beta-4 is the full 43-residue endogenous peptide. "TB-500" is a research designation applied both to full-length material and to constructs based on the LKKTETQ active motif, and usage across suppliers is inconsistent. Check the batch assay report to confirm what a given vial contains.
What does actin sequestration actually do?
Thymosin beta-4 binds monomeric G-actin in a 1:1 complex and holds it unpolymerised, creating a reservoir the cell can draw on. Releasing that monomer permits rapid, localised F-actin polymerisation at the leading edge — the mechanical basis of directed cell migration during tissue repair.
How does TB-500 differ from BPC-157?
TB-500's described mechanisms are intracellular and cytoskeletal. BPC-157's are extracellular and vascular, involving VEGFR2 signalling and nitric oxide modulation. Because the two act on different systems, they are frequently examined in parallel rather than as substitutes for one another.
Can it be stored in solution with BPC-157?
Standard laboratory practice is to reconstitute and store the two separately. The stability of a combined solution is not characterised in the literature, and mixing removes the ability to attribute any observed change to either compound.
How is purity verified?
Every batch is assayed by independent HPLC at Bioindustrial Services in Boksburg. We do not rely on the manufacturer's own certificate alone. The assay report for the batch you receive is available on request, and our full testing protocol is set out at Quality Standards.
How long does delivery take?
Orders are dispatched from South Africa, with timelines varying by region and courier. Current dispatch and transit windows are set out at Delivery Process.
Can I return an order?
Because these are laboratory compounds, returns are not accepted once an order has shipped. If your parcel arrives damaged, contact us within 48 hours with photographs of the packaging and product and we will arrange a replacement. The full terms are set out in our Refund Policy.
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