Overview
Thymogen, also known by its chemical name glutamyltryptophan or oglufanide, is a small synthetic dipeptide composed of just two amino acids — glutamic acid and tryptophan — giving it a relatively simple structure compared to many other research peptides. It belongs to a class of compounds studied as immunomodulatory peptides, meaning researchers are interested in how it may interact with immune-related processes at a cellular level. Originally derived from thymic tissue research, Thymogen has been investigated in preclinical studies exploring its potential antioxidant and reparative properties, particularly in models of liver stress and damage. It has also attracted scientific attention for its chiral chemistry, as researchers have examined how structural modifications — such as the addition of D-alanine to its molecular ends — may influence its behavior and stability in biological systems. Thymogen is intended strictly for laboratory and research purposes and is not approved or intended for human use.
Research & Bioactivity
Thymogen is a synthetic dipeptide that researchers have studied primarily in the context of immune modulation and tissue protection. Studies have examined its effects on oxidative stress markers in animal models of toxic liver injury, including models induced by hydrazine hydrochloride and carbon tetrachloride, where researchers observed changes in catalase activity and malondialdehyde concentrations following administration. In vitro research has investigated Thymogen's influence on inflammatory and proliferative processes using the THP-1 human monocytic cell line, a widely used model for studying macrophage behavior and immune signaling. Researchers have also explored structural analogues of Thymogen, including modifications involving D-amino acids, to examine how changes to the peptide's chirality and composition affect its biological activity and resistance to proteolytic degradation. Additionally, published literature has explored the broader category of thymic peptides, including Thymogen, in relation to immune homeostasis and cellular regulatory processes across various tissue types.
Published Research
Hepatoprotective Effects of Thymogen Analogues in Hydrazine Hepatopathy in Rats.
Chulanova AA, Smakhtina AM, Mal GS, Bobyntsev II, Smakhtin MY, et al. — 2025
We studied the reparative and antioxidant effects of thymogen (10 and 100 μg/kg) and its modifications in equimolar doses (12 and 120 μg/kg) obtained by attaching the amino acid D-alanine (D-Ala) to the N- or C-terminus of the peptide molecule. A single intraperitoneal injection of hydrazine hydrochloride caused a decrease in catalase activity and an increase in molondialdehyde (MDA) concentration. Administration of peptides in lower doses inhibited LPO and stimulated reparative regeneration of hepatocytes. Thymogen analogue with D-Ala at the C-terminus was most effective. Increasing the doses of thymogen (100 μg/kg) and its analogues (120 μg/kg) did not lead to further increase in their hepatoprotective activity.
The First Reciprocal Activities of Chiral Peptide Pharmaceuticals: Thymogen and Thymodepressin, as Examples.
Deigin V, Linkova N, Vinogradova J, Vinogradov D, Polyakova V, et al. — 2024
Peptides show high promise in the targeting and intracellular delivery of next-generation biotherapeutics. The main limitation is peptides' susceptibility to proteolysis in biological systems. Numerous strategies have been developed to overcome this challenge by chemically enhancing the resistance to proteolysis. In nature, amino acids, except glycine, are found in L- and D-enantiomers. The change from one form to the other will change the primary structure of polypeptides and proteins and may affect their function and biological activity. Given the inherent chiral nature of biological systems and their high enantiomeric selectivity, there is rising interest in manipulating the chirality of polypeptides to enhance their biomolecular interactions. In this review, we discuss the first examples of up-and-down homeostasis regulation by two enantiomeric drugs: immunostimulant Thymogen (L-Glu-L-Trp) and immunosuppressor Thymodepressin (D-Glu(D-Trp)). This study shows the perspective of exploring chirality to remove the chiral wall between L- and D-biomolecules. The selected clinical result will be discussed.
Reparative and Antioxidant Effects of New Analogues of Immunomodulator Thymogen in Experimental Model of Liver Damage.
Chulanova AA, Smakhtin MY, Bobyntsev II, Mishina ES, Artyushkova EB, et al. — 2023
We studied the reparative and antioxidant effects of Thymogen and its new structural analogues obtained by binding amino acid D-Ala to the N- or C-end of the peptide molecule in acute toxic hepatopathy. Intragastric administration of carbon tetrachloride for 5 days caused the development of fat degeneration of hepatocytes, a decrease in catalase activity, and an increase in malondialdehyde concentration. Administration of peptides suppressed oxidative peroxidation and stimulated reparative regeneration of hepatocytes; Thymogen analogues produced more pronounced hepatotropic and antioxidant effects than Thymogen. Inclusion of D-Ala enhanced the effect of Thymogen on the processes of regeneration in hepatocytes and the antioxidant effect under conditions of acute carbon tetrachloride hepatopathy. The highest efficiency was achieved when the amino acid was added to the C-end of the molecule.
Peptides Regulating Proliferative Activity and Inflammatory Pathways in the Monocyte/Macrophage THP-1 Cell Line.
Avolio F, Martinotti S, Khavinson VK, Esposito JE, Giambuzzi G, et al. — 2022
This study evaluates the effects of five different peptides, the Epitalon tetrapeptide, the Vilon dipeptide, the Thymogen dipeptide, the Thymalin peptide complex, and the Chonluten tripeptide, as regulators of inflammatory and proliferative processes in the human monocytic THP-1, which is a human leukemia monocytic cell line capable of differentiating into macrophages by PMA in vitro. These peptides (Khavinson Peptides), characterized by Prof. Khavinson from 1973 onwards, were initially isolated from animal tissues and found to be organ specific. We tested the capacity of the five peptides to influence cell cultures in vitro by incubating THP-1 cells with peptides at certain concentrations known for being effective on recipient cells in culture. We found that all five peptides can modulate key proliferative patterns, increasing tyrosine phosphorylation of mitogen-activated cytoplasmic kinases. In addition, the Chonluten tripeptide, derived from bronchial epithelial cells, inhibited in vitro tumor necrosis factor (TNF) production of monocytes exposed to pro-inflammatory bacterial lipopolysaccharide (LPS). The low TNF release by monocytes is linked to a documented mechanism of TNF tolerance, promoting attenuation of inflammatory action. Therefore, all peptides inhibited the expression of TNF and pro-inflammatory IL-6 cytokine stimulated by LPS on terminally differentiated THP-1 cells. Lastly, by incubating the THP1 cells, treated with the peptides, on a layer of activated endothelial cells (HUVECs activated by LPS), we observed a reduction in cell adhesion, a typical pro-inflammatory mechanism. Overall, the results suggest that the Khavinson Peptides cooperate as natural inducers of TNF tolerance in monocyte, and act on macrophages as anti-inflammatory molecules during inflammatory and microbial-mediated activity.
[Age features of bioregulatory therapy of dental diseases.].
Pinelis IS, Pinelis YI, Kuznik BI, Iordanishvili AK, Vasiliev MA — 2020
The article presents data on the use of peptide bioregulators of cell homeostasis and the protective functions of the body in various dental diseases and pathology of organs and tissues of the maxillofacial region. Issues related to the immunopharmacological effect and clinical use of natural and synthetic peptide thymomimetics (thymalin, thymogen, vilon, epithalamin, cortexin) and peptide bioregulators from cartilaginous (sigumir, chondrolux) and other tissues in case of trauma, as well as inflammatory, inflammatory and other pathological processes of tissues of the oral cavity and maxillofacial region. Particular attention is paid to their use in the complex treatment of dental diseases in the elderly.