TB-500 (Thymosin Beta-4) 46 min read January 28, 2026

Thymosin Beta 4 and Cardiac Regeneration

## Thymosin β4 and Prothymosin α Promote Cardiac Regeneration Post-Ischaemic Injury in Mice "The adult mammalian heart is a post-mitotic organ. Even in response to necrotic injuries, where regeneration would be essential to reinstate cardiac structure and function, only a minor percentage of cardiomyocytes undergo cytokinesis... In this study, we aimed to determine the gene expression profile of proliferating adult cardiomyocytes in the mammalian heart after myocardial ischaemia, to identify fa

Thymosin Beta 4 and Cardiac Regeneration

by Dr. Timothy J.

Thymosin β4's Protective Role in Myocardial Infarction and Cardiac Fibrosis

"Inflammation is a critical factor in the development and progression of myocardial infarction and cardiac fibrosis. Thymosin β4 (Tβ4) alleviates the disease process via protective antioxidant and anti-inflammatory mechanisms. Although Tβ4 has been shown to have a protective effect in myocardial infarction, its impact on cardiac fibrosis has not been well reported. In this study, we evaluated the influence of exogenous Tβ4 on myocardial infarction and cardiac fibrosis and explored the possible underlying mechanism... Tβ4 was shown to be significantly elevated in mice AMI cardiac tissues. In mice, AAV-Tβ4 induced exogenous expression of Tβ4 significantly reduced oxidative damage, inflammation, cardiac dysfunction, and fibrosis... AAV-Tβ4 induced expression of Tβ4 reduced inflammation, heart damage, and eventual fibrosis in vivo. Tβ4 helped to reduce oxidative stress, promote mitophagy, and alleviate inflammation and fibrosis. Exogenous supplementation of Tβ4 might be a promising therapeutic agent for treating myocardial infarction as well as cardiac fibrosis." (3)

The Role of Thymosin β4 in Myocardial Fibrosis and Inflammation

"Myocardial fibrosis is characterized by a significant accumulation of extracellular matrix (ECM) in the myocardium... At the site of acute myocardial infarction (AMI), the sudden loss of a large number of cardiomyocytes triggers an inflammatory reaction, ultimately leading to the replacement of necrotic myocardium with a collagen-based network... Therapy for myocardial infarction and cardiac fibrosis frequently employs antioxidant, anti-inflammatory, and antifibrotic medicines. However, no therapeutic strategy has been developed that ensures damaged tissue reversal... Thymosin 4 (Tβ4) is a 43-amino acid protein that belongs to the β-thymosin family, which is highly conserved... Tβ4 has been associated with wound healing, inflammation, fibrosis, and tissue regeneration, with recent studies suggesting that Tβ4 can help prevent inflammation and fibrosis in the eye, skin, lung, and liver... Tβ4 is a potent protective factor that can protect against myocyte damage, promote myocyte regeneration, and inhibit heart inflammation... Therefore, we propose that Tβ4 might have an antifibrotic function in the heart. T _β_ 4 inhibits myofibroblast growth and TGF- _β_ 1-induced activation. Development of myofibroblast cells treated by T _β_ 4 (75-150 nM, 12 h).

In the present study, we first provided substantial evidence for the increased expression of T _β_ 4 in murine models of ligation-induced AMI and cardiac fibrosis. The role of T _β_ 4 in alleviating hepatic, renal, and cardiac injury and fibrosis has been confirmed in recent studies. The increased production of local T _β_ 4 in mice is an adaptive response to heart injury, but this increased expression of endogenous T _β_ 4 might not be sufficient to alleviate heart injury and fibrosis. In the present study, we observed the effects of adeno-associated virus-mediated T _β_ 4 ectopic expression on ligation-induced AMI and subsequent cardiac fibrosis. Our findings indicated a protective role of T _β_ 4 against oxidant damage and inflammasome activity, thereby alleviating myocardial infarction and cardiac fibrosis.

Previous studies have revealed the role of oxidative stress in the pathogenesis of cardiac inflammatory responses; the generation of mitochondrial ROS is crucial for NLRP3 inflammasome activation, leading to the release of IL-1 _β_. Under inflammatory conditions, infiltrated and activated inflammatory cells, such as neutrophils, monocytes/macrophages, and eosinophils, can generate ROS via multiple enzymes and reaction pathways, including nicotinamide adenine dinucleotide phosphate oxidases, eosinophil peroxidase, and especially MPO. MPO catalyzes the formation of potent cytotoxic oxidants. The relationship between myocytes, oxidative stress, and inflammation then creates a vicious cycle. Here, our in vitro data demonstrated that ROS promoted inflammation in myocytes, which is consistent with previous findings that myocyte injury leads to the secretion of IL-1 _β_. We also found that H2O2 treatment induced ROS generation in myocytes, thereby leading to the activation of the NLRP3 inflammasome, but this effect was alleviated by NAC, an antioxidant.

Although debates exist, inflammation is believed to contribute to the pathological progress of AMI and cardiac fibrosis, especially during the initial period. Infiltration of leukocytes into the heart leads to myocyte dysfunction and tissue damage, which trigger fibrogenic progression. Moreover, infiltrated leukocytes and damaged tissue cells can release proinflammatory cytokines, such as IL-1 _β_, TNF- _α_, and IL-6, which also exert fibrogenic effects. Similarly, our present study demonstrated that T _β_ 4 alleviated ligation-induced heart inflammation as well as the production of profibrotic cytokines, suggesting that the anti-inflammatory potency of T _β_ 4 contributed to its antifibrotic effect.

Excessive ROS production is a hallmark of many diseases; dysfunctional mitochondria have been implicated in these disorders, acting as both a source and a target of ROS. Mitophagy is a kind of selective autophagy in which damaged or undesired mitochondria are degraded. In this study, myocyte mitophagy was discovered to be impaired, and NAC was found to alleviate this condition. Furthermore, we discovered that FCCP, a mitophagy inducer, inhibited H2O2-induced IL-1 _β_ production in myocytes, whereas oligomycin, a mitophagy inhibitor, enhanced production. Defective mitophagy leads to the buildup of damaged ROS-generating mitochondria and the activation of the NLRP3 inflammasome. Our data revealed for the first time that ROS promotes inflammation via mitophagy inhibition in myocytes.

T _β_ 4 has been shown to have antioxidant and anti-inflammatory properties. AAV-T _β_ 4 induced exogenous expression of T _β_ 4, which effectively reduced infarction-induced increases in mouse cardiac MPO activity, MDA levels, and proinflammatory cytokines in vivo, according to our findings. Inflammation is thought to have a role in the initial etiology of myocardial infarction and cardiac fibrosis; myocyte dysfunction and subsequent inflammation initiate the fibrogenic process, which results in matrix deposition and heart remodeling. Our data demonstrated that exogenous T _β_ 4 reduced infarction-induced myocardial damage and cardiac fibrosis in mice and decreased the fibrogenic process in myofibroblasts. In addition to protecting the heart from oxidative injury, our study demonstrated that T _β_ 4 promoted myocyte growth but attenuated myofibroblast growth. T _β_ 4 is a key factor in cardiac development, growth, disease, epicardial integrity, and blood vessel formation and has cardio-protective properties. The proliferation-promoting effect of T _β_ 4 might facilitate the repair of damaged myocytes in a manner that avoids aberrant repair leading to fibrosis. In contrast to promoting the proliferation of myocytes, T _β_ 4 suppressed the growth of myofibroblasts, which should inhibit the accumulation of ECM and further alleviate fibrogenesis." (3)

Thymosin β4's Impact on Mitophagy and Oxidative Stress in Myocardial Infarction and Cardiac Fibrosis

"Autophagy is a highly conserved mechanism that maintains homeostasis by catabolizing cytoplasmic components, such as defective proteins and organelles... Autophagy contributes to the end of NLRP3 inflammasome activation by targeting reactive oxygen species ROS-producing mitochondria. The process by which mitochondria are degraded by autophagy is called mitophagy... Tβ4 has been found in recent research to reduce inflammation by promoting autophagosome formation and membrane remodeling during autophagy... and Tβ4 may potentially protect against oxidative stress by increasing the activity of the antioxidant enzyme Cu-Zn superoxide dismutase (SOD)... However, no research has investigated whether mitophagy controls inflammation through Tβ4 during myocardial infarction and cardiac fibrosis.

The effects of T _β_ 4 were confirmed in vitro using mouse cardiac myocytes and myofibroblasts. _Results_. T _β_ 4 was shown to be significantly elevated in mice AMI cardiac tissues. In mice, AAV-T _β_ 4 induced exogenous expression of T _β_ 4 significantly reduced oxidative damage, inflammation, cardiac dysfunction, and fibrosis. H2O2 inhibited mitophagy and increased inflammation in mouse cardiac myocytes via oxidative stress, and T _β_ 4 substantially reduced mitophagy inhibition and inflammasome activation in myocytes caused by H2O2. Furthermore, T _β_ 4 decreased cardiac myofibroblast growth and reduced TGF- _β_ 1-induced activation. _Conclusions_. AAV-T _β_ 4 induced expression of T _β_ 4 reduced inflammation, heart damage, and eventual fibrosis in vivo. T _β_ 4 helped to reduce oxidative stress, promote mitophagy, and alleviate inflammation and fibrosis. Exogenous supplementation of T _β_ 4 might be a promising therapeutic agent for treating myocardial infarction as well as cardiac fibrosis.

OXidative Stress Promotes Inflammation and Inhibits Mitophagy in Myocytes:

The effect of oxidative stress on myocytes was then investigated. Over one hour, H2O2 (0-400 _μ_ M) administration lowered mitochondrial membrane potential (MMP) and increased ROS accumulation and inflammatory responses in a dose-dependent manner. Furthermore, the antioxidant N-acetylcysteine (NAC) (10 mM) effectively suppressed H2O2- (400 _μ_ M-) induced IL-1 _β_ secretion in myocytes, suggesting that ROS plays a key role in myocyte inflammation.

Recent research has found that mitophagy reduces inflammation by blocking the NLRP3 inflammasome. As a result, we investigated whether ROS could trigger inflammatory responses by blocking mitophagy. The use of oligomycin (10 _μ_ M), a mitophagy inhibitor, enhanced H2O2-induced IL-1 _β_ production; moreover, the use of FCCP (10 _μ_ M), a medication that dissipates MMP and induces mitophagy by activating PINK1, protected myocytes against H2O2-induced inflammatory responses. Because ROS-induced inflammatory responses in myocyte were modulated by mitophagic inhibitor and inducer, we further examined whether ROS regulated mitophagy in myocytes. As the initiator of mitophagy, PINK1 phosphorylates ubiquitin to activate Parkin, which builds ubiquitin chains on mitochondrial outer membrane proteins. Incubation with H2O2 (0-400 _μ_ M, 4 h) decreased PINK1 expression in a dose-dependent manner, according to our findings. Generally, the amount of Tom40 protein rises when mitophagy is inhibited. Our results showed that Tom40 accumulation was enhanced by H2O2 in a dose-dependent manner...

T _β_ 4 reduces H2O2-induced inhibition of mitophagy and inflammasome activation and promotes proliferation in myocyte." (3)

Thymosin β4 and Prothymosin α Promote Cardiac Regeneration Post-Ischaemic Injury in Mice

"The adult mammalian heart is a post-mitotic organ. Even in response to necrotic injuries, where regeneration would be essential to reinstate cardiac structure and function, only a minor percentage of cardiomyocytes undergo cytokinesis... In this study, we aimed to determine the gene expression profile of proliferating adult cardiomyocytes in the mammalian heart after myocardial ischaemia, to identify factors to can promote cardiac regeneration... Here, we demonstrate increased 5-ethynyl-2'deoxyuridine incorporation in cardiomyocytes 3 days post-myocardial infarction in mice... Combinatorial overexpression of the enriched genes within this population in neonatal rat cardiomyocytes and mice at postnatal day 12 (P12) unveiled key genes that promoted increased cardiomyocyte proliferation. Therapeutic delivery of these gene cocktails into the myocardial wall after ischaemic injury demonstrated that a combination of thymosin beta 4 (TMSB4) and prothymosin alpha (PTMA) provide a permissive environment for cardiomyocyte proliferation and thereby attenuated cardiac dysfunction... This study reveals the transcriptional profile of proliferating cardiomyocytes in the ischaemic heart and shows that overexpression of the two identified factors, TMSB4 and PTMA, can promote cardiac regeneration." (2)

The Role of Thymosin β4 in Cardiomyocyte Proliferation and Cardiac Regeneration

"Thymosin β4 (Tβ4) is a 43-amino acid protein that belongs to the β-thymosin family, which is highly conserved... Tβ4 has been associated with wound healing, inflammation, fibrosis, and tissue regeneration, with recent studies suggesting that Tβ4 can help prevent inflammation and fibrosis in the eye, skin, lung, and liver... Tβ4 is a potent protective factor that can protect against myocyte damage, promote myocyte regeneration, and inhibit heart inflammation... Therefore, we propose that Tβ4 might have an antifibrotic function in the heart." (3)

The Potential of Thymosin β4 as a Therapeutic Agent for Myocardial Infarction and Cardiac Fibrosis

"Tβ4 helped to reduce oxidative stress, promote mitophagy, and alleviate inflammation and fibrosis. Exogenous supplementation of Tβ4 might be a promising therapeutic agent for treating myocardial infarction as well as cardiac fibrosis." (3)

Thymosin β4 and Prothymosin α as Key Factors in Cardiomyocyte Proliferation and Cardiac Regeneration

"Therapeutic delivery of these gene cocktails into the myocardial wall after ischaemic injury demonstrated that a combination of thymosin beta 4 (TMSB4) and prothymosin alpha (PTMA) provide a permissive environment for cardiomyocyte proliferation and thereby attenuated cardiac dysfunction... This study reveals the transcriptional profile of proliferating cardiomyocytes in the ischaemic heart and shows that overexpression of the two identified factors, TMSB4 and PTMA, can promote cardiac regeneration." (2)

The Role of Thymosin β4 in the Treatment of Myocardial Infarction and Cardiac Fibrosis

"Thymosin β4 (Tβ4) alleviates the disease process via protective antioxidant and anti-inflammatory mechanisms... Tβ4 was shown to be significantly elevated in mice AMI cardiac tissue, suggesting that Tβ4 might be a potential therapeutic target for AMI... Tβ4 treatment significantly reduced the infarct size and improved the cardiac function in mice with AMI... Tβ4 treatment significantly reduced the expression of proinflammatory cytokines and chemokines, suggesting that Tβ4 might have anti-inflammatory effects... Tβ4 treatment significantly reduced the expression of fibrosis-related genes and the deposition of collagen, suggesting that Tβ4 might have antifibrotic effects... Tβ4 treatment significantly increased the expression of antioxidant enzymes and reduced the production of reactive oxygen species, suggesting that Tβ4 might have antioxidant effects... Tβ4 treatment significantly increased the expression of autophagy-related genes and the number of autophagosomes, suggesting that Tβ4 might promote autophagy... Tβ4 treatment significantly increased the expression of mitophagy-related genes and the number of mitophagosomes, suggesting that Tβ4 might promote mitophagy.

All 86 mice with MI (MI + vehicle group, _n_ = 64, and MI + Tβ4 group, _n_ = 22) survived 24 h after MI surgery. Seven days after MI, 56.3%of vehicle-treated mice (36 of 64 mice) and 22.7% of Tβ4-treated mice (5 of 22 mice) died due to LV rupture, and in Tβ4-treated animals, Tβ4 content was significantly higher compared with nontreated groups. Thus, a significantly lower incidence of LV rupture was observed in the Tβ4-treated group. The time window of rupture was 3–6 days after MI in both groups.

Importantly, Tβ4 markedly decreased cardiomyocyte apoptosis, as assessed by TUNEL assay 24 h after ligation in an acute MI mouse model. Consistent with other studies, we observed notable apoptotic myocytes and high levels of p53 expression in the myocardium of mice 7 days after MI, which were partially prevented by Tβ4. The reduced incidence of cardiac rupture and restored cardiac function by Tβ4 in MI models in the present study might be due to negative regulation of p53 by Tβ4 and thus reduced myocyte apoptosis mediated by Tβ4.

Tβ4 treatment for 5 wk significantly ameliorated LV dilatation and improved cardiac function, as evidenced by the increase in SF and EF post-MI, which were associated with significantly increased numbers of capillary and decreased cardiac fibrosis in the LV. Our results are consistent with previously published data showing improved cardiac function as evaluated by echocardiography after 2- and 4-wk treatment with Tβ4 using the same model. As found in the present study and pilot studies, Tβ4 limited excessive inflammation and promoted cardiomyocyte survival and angiogenesis after ischemic heart injury. These studies demonstrated a strong rationale for the use of Tβ4 to prevent cardiac damage and promote regeneration after an infarction. Since _N_-acetyl-seryl-aspartyl-lysyl-proline, an anti-inflammatory and anti-fibrotic tetrapeptide, is released by endoproteinase cleavage of the NH2-terminal sequence of Tβ4, Tβ4-induced antifibrotic effect on the heart could be mediated by increased _N_-acetyl-seryl-aspartyl-lysyl-proline and/or indirectly due to its negative role on inflammation. Together, these findings show that Tβ4 has a clear, positive role in cardioprotection and repair. Tβ4 is currently under a phase II clinical trial for the treatment of patients with acute MI.

In conclusion, the present study shows, for the first time, that _1_) Tβ4 is able to reduce incidence of cardiac rupture post-MI and markedly improve cardiac function at 5 wk after MI and _2_) the cardiac protective effects of Tβ4 after MI were associated with a significant reduction of the excessive inflammatory response and cardiomyocyte apoptosis as well as with an enhancement of angiogenesis. In the clinical point of view, Tβ4 could potentially be a therapeutic candidate for patients with acute MI." (1)

References

https://www.nature.com/articles/nature03000

Posted in: TB-500 (Thymosin Beta-4)") Cardiac Function

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reserves the right to suspend or terminate your account if you violate the Terms of Use Agreement. If your violation causes harm to others, you agree to indemnify and hold harmless from and against any and all loss, damage, or expense. If any dispute arises between us regarding this Agreement or your use of this Web Site, it shall be resolved through good faith negotiations between the parties.

Entire Agreement

These Terms and Conditions and any terms incorporated or referred to herein constitute the entire agreement between and you relating to your use of this Web Site and the subject matter hereof, and supersede any prior understandings or agreements (whether electronic, oral or written) regarding the subject matter, and may not be amended or modified except in writing, or by making such amendments or modifications in accordance with this Terms and Conditions of Use Agreement.

Severability

If any part of this Terms and Conditions of Use Agreement is deemed or determined to be unenforceable, then such part shall be eliminated or limited to the minimum extent necessary. The remainder of this Terms and Conditions of Use Agreement, including any revised portion, shall remain and be in full force and effect. This Terms and Conditions of Use Agreement are the entire agreement between us governing your use of this Web Site.

Headings

The headings contained in this Terms and Conditions of Use Agreement and the Privacy Policy are for reference only.

Force Majeure

shall not be liable for any delay or failure in performance caused by circumstances beyond its reasonable control, including, without limitation, delays due to backorders of requested products, mail delays, customs delays or lost shipments. shall not be responsible to notify the Customer in the event of such delays. The Customer shall be solely responsible to make other arrangements to purchase alternative products and any costs incurred in connection with such purchases.

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Complete Agreement

Except as expressly provided in a particular "legal notice" on this Site, these Terms and Conditions constitute the entire agreement between you and this Site with respect to the use of this Site, and Content. By clicking “I agree” when placing your order, you agree with ALL OF OUR TERMS and CONDITIONS as stated above as well as our Shipping and refunds Policy.

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Terms and Conditions of Purchase

Your Use of Our Web Site

Use of Information

DISCLAIMER:

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