TB-500

    • TB-500

    TB-500 is a 43 amino acid synthetic analog of thymosin B-4 (TB-4), which occurs naturally in nearly all mammalian cells. TB-500 is known for its effects on actin, cell migration, and wound healing. Animal models and in vitro studies have shown that TB-500 can improve blood vessel growth, accelerate wound healing, reduce inflammation, and promote production of extracellular matrix. The peptide is currently being studied for its ability to reduce oxidative stress in spinal cord injuries, improve recovery after heart attacks, and have a variety of anti-aging effects.

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    What is TB-500?
    TB-500 is a 43 amino acid synthetic analog of thymosin B-4 (TB-4), which occurs naturally in nearly all mammalian cells. TB-500 is known for its effects on actin, cell migration, and wound healing. Animal models and in vitro studies have shown that TB-500 can improve blood vessel growth, accelerate wound healing, reduce inflammation, and promote production of extracellular matrix. The peptide is currently being studied for its ability to reduce oxidative stress in spinal cord injuries, improve recovery after heart attacks, and have a variety of anti-aging effects.

    TB-500 Mechanism of Action

    TB-500 is the active domain of TB-4 and primarily acts as an actin-binding protein. Actin is an important component of cellular structure and makes up microfilaments. Microfilaments are responsible for giving cells their shape, protecting the integrity of cell membranes, allowing cells to move/migrate, and certain steps in cell reproduction. Actin is also one of the main components of muscle protein. Without actin, muscles cannot contract. Actin-binding proteins such as TB-4 sequester actin monomers (single units of actin), thereby protecting them from degradation and allowing them to polymerize into microfilaments when needed.




    1.TB-500 and neurological function


    Studies in rats have found that TB-500 promotes the repair and remodeling of tissue in the central and peripheral nervous systems after injury. Although the exact mechanism has not yet been elucidated, studies have shown that TB-500 activates cells that support neurons. These cells, called oligodendrocytes, keep neurons healthy. Enhancing their activity can actually improve blood vessel and neuronal growth in damaged brain areas, an important laboratory result reflected in clinically significant improvements in behavioral, motor control, and cognitive measures.

    Recent studies have shown that TB-500 can reduce oxidative stress after spinal cord injury and help transplanted neural stem/progenitor cells (NSPCs) survive long enough to enhance spinal cord regeneration. 

     These findings may make TB-500 and other TB-4 derivatives of great benefit in treating severe spinal cord injuries. TB-550 may provide important insights into spinal rehabilitation, allowing paralyzed people to regain use of affected body parts.


    2. TB-500 and Blood Vessel Growth


    TB-500 and TB-4 are potent stimulators of VEGF expression. VEGF is an important signaling molecule for capillary (small blood vessel) growth, which is essential for everything from wound healing to hair growth[4]. However, TB-500 is thought to work more complexly than that. Scientists speculate that the peptide may support multiple steps in the blood vessel growth process, including extracellular matrix remodeling, angiogenesis, vasculogenesis, and the transition from more primitive mesenchymal tissue to the specialized endothelial tissue lining blood vessels. This speculation is correct, as the absence of TB-4 has been shown to interfere with blood vessel growth and stability, while exogenous administration improves capillary formation and pericyte recruitment after injury.


    3. TB-500 and Hair Growth


    The discovery that TB-500 promotes hair growth was purely accidental. When mice with the gene-deficient TB-4 were shaved in laboratory experiments, the researchers found that their hair grew much more slowly than wild-type mice. When the scientists studied hair growth in mice that had been genetically modified to produce higher levels of TB-4, they found that these mice grew hair much faster than normal mice. Under a microscope, the mice had an increase in the number of hair shafts and follicles.


    4. TB-500 works synergistically with antibiotics


    Multidrug resistance is becoming increasingly common in a variety of infections, rendering current treatments ineffective. Unfortunately, the development of new antibiotics is very slow, with the drug development process taking an average of more than two decades. However, a recent study on the effects of TB-4 and its adjuvants offers some hope. A study of mice with Pseudomonas aeruginosa eye infections found that combining TB-4 with ciprofloxacin, a standard antibiotic for treating Pseudomonas aeruginosa, enhanced the effectiveness of the antibiotics, improved healing, reduced inflammation, and promoted faster recovery. Results from just five days of combined treatment showed a decrease in colony-forming units (CFU), a decrease in neutrophil (a type of white blood cell) counts, and reduced levels of inflammatory reactive oxygen species. This is the first study to demonstrate that TB-500 and similar peptides can be used to promote and enhance the effects of antibiotics.

    5. TB-500 and Cardiovascular Health
    Twenty years of research have shown that TB-4 and its derivatives have a variety of beneficial effects on the cardiovascular and renal systems. However, the specific mechanisms of these positive effects are unclear. Studies have shown that these benefits are actually due to several mechanisms. First, TB-500 promotes the growth of collateral vessels, which can be used both for prevention and restoration of function after disease. Second, TB-500 promotes endothelial cell migration and myocyte survival after a heart attack. Finally, TB-500 appears to work synergistically with other natural signaling molecules to reduce inflammation and reduce fibrosis (scar formation).

    Recently, studies on hydrogels containing a combination of collagen and TB-4 showed that the peptide promoted angiogenesis and epicardial heart cell migration, thereby improving recovery rates after ischemia and helping to prevent long-term complications by reducing scarring.


    6.TB-500 and Neurodegenerative Diseases


    The search for treatments for neurodegenerative diseases such as Alzheimer's and leukemia has been slow. A recent study on the effects of TB-4 on the immune system's ability to process leukemia proteins showed that the peptide enhances autophagy!. Autophagy is the central nervous system's primary protective mechanism against neurodegenerative diseases. TB-4's ability to enhance this natural immunity is the first step in a long time of progress toward truly treating these debilitating diseases.


    7.TB-500 has a wide range of applications


    TB-500 is able to affect a variety of different body tissues due to the fundamental role it plays in cell structure and function. This has led to a wide and varied study of the effects of this peptide. From treating cardiac and neurological diseases to enhancing the effects of antibiotics, TB-500 is one of the hottest peptides in research today and will likely remain one of the most intensively studied peptides for the foreseeable future
    TB-500 exhibits minimal side effects, low oral, and excellent subcutaneous bioavailability in mice. The mouse per kg dose is not applicable to humans. TB-500 sold by Peptide Sciences is for educational and scientific research purposes only and is not for human consumption. Only licensed researchers may purchase TB-500.