What is the specific mode of action of Epitalon in the treatment of neurodegenerative diseases?
Regulation of immune function:
Studies have shown that Epitalon can affect the immune response of mice under different stress conditions. In the face of immune-stimulating rotational stress and immunosuppressive combined stress, Epitalon can increase the proliferation activity of thymocytes [4]. This means that Epitalon may enhance the body’s resistance to neurodegenerative diseases by regulating the immune system. The proliferation of thymocytes is closely related to the function of the immune system, and the immune system plays an important role in the occurrence and development of neurodegenerative diseases. For example, some neurodegenerative diseases may be related to the abnormal activation or dysfunction of the immune system. The promoting effect of Epitalon on the proliferation of thymocytes may help maintain the balance of the immune system, thereby alleviating the symptoms of neurodegenerative diseases.
Influence on the signal transduction pathway:
Epitalon has a regulatory effect on the interleukin-1β (IL-1β) signal transduction pathway. Specifically, Epitalon can increase the synergistic effect of IL-1β and affect the activity of the key enzyme in the ceramide signal transduction pathway in the cerebral cortex membrane, namely membrane neutral sphingomyelinase (nSMase)[4]. IL-1β is an important cytokine involved in a variety of physiological and pathological processes. In neurodegenerative diseases, the abnormal expression of IL-1β may lead to neuroinflammation and neuronal damage. By regulating the IL-1β signal transduction pathway, Epitalon may reduce neuroinflammation and protect neurons from damage. In addition, changes in the activity of nSMase are also related to neurodegenerative diseases. The regulation of the activity of nSMase by Epitalon may help maintain the normal function of nerve cells.In conclusion, the mode of action of Epitalon in the treatment of neurodegenerative diseases may involve immune regulation and the regulation of the signal transduction pathway. However, the current research on Epitalon in the treatment of neurodegenerative diseases is still in the preliminary stage, and further research is needed to confirm its effectiveness and safety.
The research progress of Epitalon
The impact on the quality of oocytes
Delaying the aging of oocytes:
In vitro experimental studies have found that Epitalon can reduce the level of intracellular reactive oxygen species (ROS) in aged mouse oocytes after ovulation. Over time, the developmental potential of oocytes will gradually decrease after ovulation in vivo or in vitro. As a synthetic short peptide, Epitalon acts similarly to melatonin and is an effective antioxidant, which may have the benefit of extending lifespan. Treatment with Epitalon significantly reduced the frequency of spindle defects and abnormal distribution of cortical granules during 12 hours and 24 hours of aging, and at the same time increased the mitochondrial membrane potential and the copy number of mitochondrial DNA, thereby reducing the apoptosis of oocytes during 24 hours of in vitro aging. These results indicate that Epitalon can delay the aging process of oocytes in vitro by regulating mitochondrial activity and ROS levels[2].
Improving the quality of oocytes:
Adding 0.1 mM of Epitalon to the in vitro culture medium can reduce the rate of cytoplasmic fragmentation in the parthenogenetic activation of oocytes caused by in vitro aging after ovulation, reduce the ratios of abnormal spindle morphology and abnormal exocytosis of cortical granules, increase the mitochondrial membrane potential and the copy number of mitochondrial DNA, and reduce the positive rate of Annexin V staining and the fluorescence intensity of γH2AX in in vitro aged oocytes. This indicates that Epitalon can improve the disorder of organelles during the in vitro aging process of oocytes and improve the quality of oocytes (Xue Yue).
The impact on the differentiation of nerve cells
Studies have found that the AEDG peptide (Epitalon) can increase the synthesis of neurogenic differentiation markers in human gingival mesenchymal stem cells, such as Nestin, GAP43, β Tubulin III, and Doublecortin. Molecular modeling methods show that Epitalon preferentially binds to H1/6 and H1/3 histones, which may be one of the mechanisms for increasing the transcription of these neuronal differentiation genes[5].
The regulatory effect on the nervous system
Regulating neuronal activity:
Through research on rats, it has been found that intranasal infusion of Epitalon (2 ng) can significantly activate the neural activity of the cerebral cortex of rats within a few minutes, and the firing frequency of neurons is increased by 2 – 2.5 times[6]. In some recordings, complex responses consisting of several stages were also observed. The increase in the spontaneous activity of neurons by Epitalon is caused by a higher frequency of already active units and the participation of previously silent cells. At least the first stage of the action of Epitalon can be explained by the direct effect of this peptide on the cells of the motor cortex.
Stress protection effect:
Epitalon has a stress protection effect on mice exposed to different stress conditions. Experiments have shown that Epitalon increases the proliferation activity of thymocytes. Whether it is enhanced under immune-stimulating rotational stress or inhibited under immunosuppressive combined stress, Epitalon can play a regulatory role (Vladimir Kh Khavinson, 2002). At the same time, Epitalon can also increase the synergistic effect of interleukin-1β (IL-1β) and has an impact on the changes in the activity of sphingomyelinase (nSMase) in the cerebral cortex membrane induced by stress. This indicates that Epitalon has a stress protection effect at the level of IL-1β signal transduction in the sphingomyelin pathway and at the level of target thymocyte proliferation in nerve tissues.
The impact on the endocrine function of non-human primates:
In elderly rhesus monkeys, Epitalon can reduce the basal levels of glucose and insulin and increase the basal nighttime melatonin level. At the same time, Epitalon can reduce the area under the plasma glucose response curve, increase the “disappearance” rate of glucose, and normalize the plasma insulin kinetics in response to the administration of glucose. This indicates that Epitalon is a promising factor for restoring age-related endocrine dysfunction in primates[7].
The potential application of Epitalon in the treatment of nervous system diseases
Alzheimer’s disease: Alzheimer’s disease is a common neurodegenerative disease, mainly characterized by a decline in cognitive function and memory loss. Current research shows that Alzheimer’s disease is related to impaired neurogenic differentiation. The number of neural stem cells in the brains of Alzheimer’s disease patients decreases, and their differentiation ability is also inhibited. Epitalon may promote the proliferation and differentiation of neural stem cells, increase the number of neurons, and improve the cognitive function of Alzheimer’s disease patients. In addition, Epitalon may also regulate the release of neurotransmitters, improving the memory and learning ability of Alzheimer’s disease patients[8].
Parkinson’s disease: Parkinson’s disease is a neurodegenerative disease mainly characterized by motor disorders. Its main pathological feature is the loss of dopaminergic neurons in the substantia nigra. The current treatment methods mainly relieve the symptoms by supplementing dopamine or inhibiting the degradation of dopamine, but these methods cannot stop the progression of the disease. Neural stem cell transplantation is a potential treatment method, but the source and differentiation ability of neural stem cells are still a problem. Epitalon may promote the proliferation and differentiation of neural stem cells, increase the number of dopaminergic neurons, and improve the motor function of Parkinson’s disease patients[8].
Stroke and brain injury: Stroke is a common cerebrovascular disease, and its main consequence is the death of neurons and neurological dysfunction. Brain injury may also lead to the loss of neurons and dysfunction. Neural stem cells play an important role in the repair and regeneration after stroke and brain injury. Epitalon may promote the proliferation and differentiation of neural stem cells, increase the number of neurons, and improve the neurological function of stroke and brain injury patients [8].
In conclusion, as a synthetic tetrapeptide, the core anti-aging mechanism of Epitalon lies in activating the expression of the telomerase reverse transcriptase subunit (TERT) gene, extending the length of telomeres and maintaining telomerase activity, thereby intervening in the core process of cellular aging. Its significance lies in the first realization of anti-aging intervention from the perspective of telomere biology, breaking through the limitation of traditional antioxidants that only target free radicals, and providing a new target for delaying age-related diseases such as Alzheimer’s disease and cardiovascular diseases. Although its long-term safety (especially the risk of cancer) still needs to be verified in phase III clinical trials, as the research and development paradigm of the first telomerase activator-type anti-aging drug, it marks a revolutionary breakthrough in aging intervention from symptom improvement to molecular mechanism regulation and is expected to promote the extension of human healthy lifespan.
Scientific Journal AuthorVladimir Khavinson is a prominent Russian biogerontologist and peptide bioregulator researcher. He is the Director of the St. Petersburg Institute of Bioregulation and Gerontology and a member of the Russian Academy of Medical Sciences. Khavinson has made significant contributions to the field of aging research and has authored numerous publications in reputable journals such as “Molecular Biology of Aging” and “Journal of Anti-Aging Medicine”. His work primarily focuses on the development and application of peptide bioregulators to combat age-related diseases and improve healthspan. Khavinson’s research has been influential in the field of gerontology, offering new insights and therapeutic approaches for healthy aging. Vladimir Khavinson is listed in the reference of citation [5].
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