Gonadorelin (GnRH) is a decapeptide gonadotropin-releasing hormone agonist.^[1] It appears to work by stimulating the synthesis and release of luteinizing hormone and follicle-stimulating hormone. It is being researched within the context of infertility and reproductive systems, and hypogonadism. It is also studied for its potential as a diagnostic tool to assess pituitary function.

Pegylated Mechano-growth factor (PEG-MGF) is a peptide that originates from the IGF-I (main anabolic mediator of growth hormone) gene sequence, which undergoes a process called alternative splicing.^[1] This process allows for the synthesis of additional segments, which form new functional molecules. During stress or injury, it has been suggested that muscles produce an alternative peptide called IGF-IEc, which contains extra “exons” or domains. This is thought to result in an additional segment at the C-terminus of IGF-I, known as the Ec-peptide, which comprises 40 amino acids.^[2]

MGF, or mechano-growth factor, is a synthetic peptide that represents the last 24 amino acids from the naturally occurring IGF-IEc molecule (the Ec-peptide). This 24 amino acid fragment is also called the E-domain or MGF-E and is thought to mediate the beneficial actions of IGF-IEc on muscle recovery and cell proliferation.^[5]. It appears to stimulate myoblast (muscle cell) proliferation and differentiation. It has further been researched for its potential to increase endurance, stimulate the function of the immune system, and possible applications that may decrease cholesterol. PEG-MGF may also hasten wound healing via immune function regulation. The up-regulation of IGF-IEc, sometimes referred to as full-length MGF, during periods of stress or injury has been correlated by researchers with the proliferation of satellite cells and muscle cells. This suggests a potential role in muscle tissue repair and regeneration.^[3][4]

The attachment of a polyethylene glycol moiety to another chemical compound is termed “Pegylation.” Pegylation appears to increase the plasma stability of a compound like MGF by decreasing its clearance and potentially masking its immunogenicity. Pegylation may be considered a common and typically advantageous modification. MGF appears to have a shorter half-life than other peptides. With this in mind, the pegylation of the peptide may overcome any rapid clearance.

Vasoactive intestinal peptide (VIP, vasoactive intestinal polypeptide, PHM27) is a short peptide hormone endogenously produced in the gastrointestinal tract, pancreas, and brain of most vertebrate animals. Researchers have suggested that the peptide may exhibit potential to influence inflammation, particularly in the cases of neurodegenerative disease, pulmonary fibrosis, inflammatory bowel disease, and cardiac fibrosis. VIP has been suggested to act as an immune system regulator and has been classified by scientists as an anti-inflammatory peptide. It is of active scientific interest for its proposed ability to support cognitive function in the setting of neurodegenerative disease. VIP has been hypothesized to bind to class II G protein-coupled receptors.

TB-500, or Thymosin Beta-4, is a synthetic analog of the endogenous Thymosin beta 4 protein, which is considered ubiquitously present in cells. The peptide belongs to a widespread family of 16 related molecules considered to exhibit a high degree of sequence conservation and localization in the majority of tissues and circulating cells.

Thymosin Beta-4 is speculated to encompass a unique peptide sequence, LKKTETQ, found between the 16th and 24th amino acids. This sequence is thought to assist in actin binding potentially. Actins are proteins believed to be vital to the cell’s cytoskeleton. They appear to maintain the cell’s structural framework and are considered by experts to be crucial for primary cellular activities, such as movement.

It is hypothesized that Thymosin Beta-4 associates with actin by attaching to globular actin (G-actin), the monomeric form of actin, before it forms filamentous actin (F-actin). This suggested interaction between Thymosin Beta-4 and G-actin might impede the polymerization process, a mechanism known as actin sequestration. This interference might potentially increase the concentration of G-actin.

The assumed inhibition of F-actin polymerization by Thymosin Beta-4 might result in alterations to the cellular cytoskeleton’s structure. These changes may impact the cell’s ability to move and undergo shape transformations.^[1] TB-500 was developed with the intention of sequestering and blocking actin polymerization in eukaryotic cells and influencing cell motility and transformation in experimental settings.

Pinealon (also referred to as EDR) is a short peptide comprising only three amino acids (Glu-Asp-Arg). Additionally, it is classified as one of Khavinson’s peptides. EDR is generally extracted from a crude polypeptide extract called Cortexin. Pinealon is considered to be a peptide bioregulator, and it appears to interact directly with DNA. It may contribute to the alteration of gene expression levels. It may potentially exhibit behavior modification and may protect various cell types, including neurons, against hypoxia. Pinealon has been studied for its potential to impact the pineal gland to address issues with metabolism, circadian rhythm disorders, and certain cognitive functions.

Specifications

Molecular Formula: C₁₄H₂₃CuN₆O₄

Molecular Weight: 340.38 g/mol

Sequence: Gly-His-LysCu.xHAc

Chonluten is also known as Tripeptide T-34 or EDG, due to its sequence (Glu-Asp-Gly). It is a cytogenetic complex consisting of short peptides that are suggested to normalize the mucous membrane cells of the lungs and the bronchial tube. It is a gene regulator associated with inflammation and antioxidant activity, and is considered to be involved in proliferation responses.^[1] It appears to function in animal test models as an anti-inflammatory in the lungs, normalizing the mucosal functions of the lungs in conditions like asthma and chronic obstructive pulmonary disease (COPD).

Livagen is a short peptide bioregulator, similar in structure to Epitalon. It is a tetrapeptide made of the amino acids Lys-Glu-Asp-Ala (KEDA) and is classified amongst Khavinson’s peptides. As a bioregulator, the peptide may interact with genetic material in different cells and consequently unpack and “unlock” various cellular genes. Livagen’s impacts appear to be exhibited directly on the lymphocytes (cells of the immune system), liver, and gastrointestinal tract (GIT). Its direct functions may be widespread, as suggested through research studies on DNA and gene expression patterns. The potential of the Livagen peptide to activate genes enclosed in the GIT and immune system may reflect possible age-mitigating characteristics exerted on cells.