What Is Epithalon?
Epithalon (Epitalon) is a synthetic tetrapeptide composed of four amino acids: alanine, glutamic acid, aspartic acid, and glycine (Ala-Glu-Asp-Gly; AEDG). It was synthesized based on the amino acid composition of Epithalamin, a peptide preparation derived from bovine pineal tissue.
Epithalon is classified as an oligopeptide and has been investigated in published scientific research as a distinct synthetic peptide. A definitive primary molecular target has not been experimentally established. The scientific literature has examined Epithalon in several areas of cellular and molecular biology, but its precise molecular basis remains incompletely characterized.
Research Overview Table
Chemical and Molecular Characteristics
Epithalon is a small synthetic tetrapeptide with a linear structure consisting of alanine, glutamic acid, aspartic acid, and glycine (Ala-Glu-Asp-Gly; AEDG). It has a molecular formula of C₁₄H₂₂N₄O₉ and a molecular weight of 390.35 g/mol. Its four-residue structure makes it considerably smaller and less structurally complex than recombinant proteins and larger peptide-based research compounds.
Its physicochemical properties are determined by the peptide backbone and the functional groups present in its amino acid residues. Studies report seven hydrogen-bond donors, ten hydrogen-bond acceptors, twelve rotatable bonds, and a topological polar surface area of 225 Ų. These characteristics are relevant to the chemical behavior and characterization of a small peptide in laboratory research.
The defined sequence and relatively small molecular size distinguish Epithalon as a discrete synthetic peptide. Its structure also differs from modified forms such as Epithalon TFA, which have a different molecular composition and molecular weight.
Certificates:
Mechanism of Action Under Investigation
Researchers have investigated Epithalon for possible interactions with DNA regulatory sequences. Computational and conformational analyses identified potential Epithalon-binding sequences within promoter regions associated with telomerase and RNA polymerase II. Proposed interactions include hydrogen bonding and hydrophobic interactions between the peptide and nucleotide bases. The available studies do not establish the structure of a confirmed Epithalon–DNA complex.
A second proposed mechanism involves interaction with linker histones. Molecular modeling identified preferential binding of Epithalon to histones H1.3 and H1.6 at regions involved in DNA interaction. The proposed binding may affect histone–DNA association and transcriptional regulation. However, this mechanism is based on molecular modeling and associated experimental observations rather than direct experimental confirmation of the binding event.
Researchers have investigated telomerase regulation as a molecular consequence of Epithalon exposure. Experimental studies measured telomerase catalytic-subunit expression and telomerase activity, while later work examined hTERT mRNA, telomerase activity, and alternative lengthening of telomeres using qPCR and immunofluorescence. These measurements help examine molecular events linked to telomere maintenance, but they do not establish how the initial Epithalon interaction produces these changes.
Scientific Research Context
Epithalon appears in published scientific literature because its biological properties have been investigated in experimental research. The literature includes in vitro cellular studies, in vivo animal studies, and in silico investigations, with evidence derived primarily from in vitro and preclinical animal models. A smaller body of clinical research has also been reported. The available literature therefore remains primarily preclinical, with studies conducted across different experimental systems rather than a large body of controlled human research.
Epithalon Biology and Biological Pathways
Primary Biological Function
Epithalon research has examined biological systems involving the pineal gland, telomere maintenance, cellular differentiation, and mitochondrial function. Pineal biology is relevant because Epithalon was synthesized from the amino acid composition of Epithalamin, a pineal peptide preparation. Telomere biology is another major research area because telomere length and telomerase activity provide measurable indicators of chromosome-end maintenance. Researchers have also examined mitochondrial biology in relation to cellular metabolic state and organelle function.
Relevant Metabolic or Signaling Pathways
The best-supported pathways investigated directly with Epithalon include pineal melatonin synthesis and telomere-maintenance pathways. In cultured rat pinealocytes, researchers examined AANAT and pCREB, both associated with regulation of melatonin synthesis. Telomere studies have examined telomerase and alternative lengthening of telomeres as distinct mechanisms for maintaining chromosome ends. Researchers investigate these pathways because they provide defined biochemical processes that can be measured experimentally.
Tissue-Specific Biology
Pineal tissue is an important system in Epithalon research because of its relationship to melatonin production and pineal cellular function. Human somatic cells, including fibroblasts, have been used to investigate telomere biology. Human epithelial and fibroblast cell lines have also been examined in more recent telomere research. Mouse oocytes provide a separate tissue-specific system for investigating mitochondrial characteristics during post-ovulatory cellular aging.
Experimental Biomarkers
Reported Epithalon-related measurements include AANAT, pCREB, melatonin, hTERT mRNA, telomerase activity, telomere length, ALT activity, mitochondrial membrane potential, mitochondrial DNA copy number, and intracellular reactive oxygen species. These measurements have been used to assess specific biological processes in Epithalon studies, including pineal melatonin production, telomere maintenance, and mitochondrial status. The biomarkers therefore vary according to the biological system and research question examined.
Laboratory Investigation Methods
Published Epithalon studies have used cell culture, quantitative PCR, immunofluorescence, immunohistochemistry, biochemical assays, and molecular modeling. These methods are used to examine gene expression, cellular markers, biochemical activity, and proposed molecular interactions.
Experimental Models Used in Published Research
Published Epithalon research has used cellular, animal, and specialized biological models. These models provide different levels of biological complexity, from isolated cells to whole organisms. The choice of model depends on the biological question being investigated. Their limitations mainly involve differences in cellular context, species biology, and the ability to reproduce human physiology.
Human Cell Models
Human fibroblast and epithelial cell cultures have been used as in vitro models for Epithalon research. These models provide controlled human-derived cellular systems for examining cellular processes. Their main limitation is that two-dimensional cell cultures do not reproduce tissue architecture, multicellular interactions, or whole-organism physiology.
Human Stem Cell Models
Human periodontal ligament stem cells and human mesenchymal stem cells have been investigated as models of cellular differentiation. They allow researchers to examine cellular changes under controlled culture conditions. Their main limitation is that isolated stem-cell cultures do not reproduce the organization and signaling environment of intact tissues.
Mouse Models
SAMP-1, SAMR-1, SHR, CBA, and transgenic FVB/N HER-2/neu mice have been used in Epithalon research. These models provide intact mammalian systems for studying organism-level and tissue-specific processes. Their main limitation is that strain-specific characteristics and differences between mouse and human physiology can limit translation to human biology.
Rat Models
Wistar rats are the main rat model reported in Epithalon research. Studies include pinealectomy and gastrointestinal models. Rats allow researchers to study Epithalon in a whole-animal setting. The main limitation is differences between rat and human biology, which limit direct translation.
Drosophila Model
Drosophila melanogaster, including the wild-type Canton-S strain, appears in Epithalon research. Researchers use flies as a whole-organism model for controlled studies across the life cycle. The main limitation is the large biological difference between insects and mammals, which limits direct application of findings to human biology.
Mouse Oocyte Model
Mouse oocytes have been used as a specialized in vitro model for post-ovulatory cellular aging. The model permits controlled examination of oocyte integrity and cellular characteristics during culture. Its limitation is its highly specialized reproductive-cell biology, which makes the findings difficult to generalize to other human cell types or tissues.
Epithalon Published Research
Telomere and Telomerase Research
Telomere research has examined telomerase activity, telomere length, and telomerase catalytic-subunit expression in human somatic cells. Studies used human fibroblast cultures to investigate telomere-related cellular changes and proliferative capacity. The findings provide cell-based evidence for Epithalon-related changes in telomere biology, but these studies do not establish the same effects in whole organisms or humans.
Pineal and Melatonin Research
Pineal research has examined melatonin production and pineal function. Studies have investigated Epithalon in relation to melatonin secretion in pineal and animal systems, including work involving aged rhesus monkeys and female rats. These studies provide experimental observations on pineal-related biology, although much of the evidence comes from animal research.
Gene Expression Research
Gene-expression studies have examined how Epithalon relates to transcriptional changes in different tissues. One mouse study analyzed thousands of transcripts in brain tissue and identified changes in genes associated with cell-cycle processes, apoptosis, and nucleic-acid metabolism. The study also examined tissue differences between brain and heart, making tissue-specific gene expression a distinct research area.
Aging-Related Animal Research
Published animal studies have investigated Epithalon in relation to aging biomarkers, chromosome stability, lifespan, reproductive aging and tumor development. Research has examined chromosome aberrations, survival, estrous function, and spontaneous tumor incidence. These studies cover several aspects of aging biology, but the observations are specific to the experimental animals and conditions used in each study.
Antioxidant and Cellular Research
Cellular antioxidant research has examined catalase activity and conjugated hydroperoxides in Drosophila melanogaster. The work investigated changes in antioxidant-related measures in different inbred fly lines. The model provides an organism-level system for studying oxidative processes, but insect biology differs substantially from mammalian biology.
Analytical Documentation
HPLC separates Epithalon from other compounds in a sample and helps assess purity. LC-MS measures molecular mass and helps confirm the peptide’s identity. NMR gives additional information about its molecular structure.
A Certificate of Analysis lists the test results for a specific batch, such as identity and purity. Together, these records provide chemical verification of the research material. Analytical documentation verifies product identity and quality rather than biological performance.
Storage and Laboratory Handling
Store Epithalon at 2–8°C, according to the supplied Certificate of Analysis. The material should remain in its specified storage conditions to help maintain its stated quality. Storage areas should be clean, dry, and protected from conditions that could affect the material.
Qualified laboratory personnel should handle Epithalon using clean equipment and suitable laboratory practices. Keep the material properly labeled and prevent contamination during storage and handling. Use the material properly identified and separate from unrelated laboratory materials. Epithalon is intended for laboratory research use only.
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