T-31 is a synthetic tripeptide composed of the amino acid sequence Ala-Glu-Asp (AED) and is commonly referred to in scientific literature as Cartalax. It belongs to the family of Khavinson bioregulatory peptides, a group of short peptides that have been investigated for their potential to influence gene expression by interacting with chromatin and specific DNA regions.
Current laboratory research suggests that T-31 may regulate transcriptional pathways associated with cellular proliferation, apoptosis, and senescence. Experimental studies have also proposed that the peptide may influence genes involved in telomere biology, growth factor signaling, inflammatory regulation, and cellular stress responses. As a result, T-31 has become a research tool for investigating age-related molecular pathways in fibroblasts, renal epithelial cells, and mesenchymal stem cell models.
Research
T-31 Peptide and Fibroblast Function
Fibroblasts are specialized connective tissue cells responsible for producing extracellular matrix components such as collagen, fibronectin, and proteoglycans. Because these cells gradually lose proliferative capacity during repeated laboratory passaging, they are frequently used to model cellular aging.
Research conducted by Lin’kova and colleagues investigated the effects of T-31 in fibroblast cultures at various stages of in vitro aging. Their findings suggest that exposure to T-31 may increase expression of Ki-67, a well-established marker of cellular proliferation. Elevated Ki-67 levels may indicate that the peptide supports maintenance of proliferative activity in aging fibroblast cultures.
Investigators also observed increased expression of CD98hc, a membrane glycoprotein involved in amino acid transport, nutrient uptake, and integrin-mediated signaling. Since CD98hc contributes to cell survival and adhesion, its increased expression may reflect improved cellular maintenance under aging conditions.
The study further reported reductions in caspase-3, a central mediator of apoptosis, in both early- and late-passage fibroblast cultures. Researchers interpreted these findings as evidence that T-31 may reduce apoptotic signaling during cellular aging.
Additional observations demonstrated lower expression of matrix metalloproteinase-9 (MMP-9) in aged fibroblasts following peptide exposure. Because MMP-9 participates in extracellular matrix degradation, reduced expression may indicate a shift toward preservation of connective tissue architecture.
Taken together, the combination of increased Ki-67 and CD98hc alongside reduced caspase-3 and MMP-9 suggests that T-31 may promote a more regenerative and less catabolic phenotype in cultured fibroblasts.
T-31 Peptide and Renal Epithelial Cells
Several studies have explored T-31 in laboratory models of renal epithelial aging.
Research by Khavinson and colleagues evaluated aged kidney cell cultures exposed to T-31 while monitoring expression of biomarkers associated with proliferation, apoptosis, and inflammation. The investigators reported that T-31 appeared to reduce expression of the pro-apoptotic protein p53, while simultaneously supporting increased cellular proliferation.
The authors suggested that aged renal epithelial cultures exposed to T-31 demonstrated reduced apoptotic activity together with enhanced proliferative potential. Similar findings were later reported in kidney tissue cultures obtained from both young and aged experimental models, where T-31 exposure was associated with increased Ki-67 expression and lower p53 levels.
Collectively, these observations suggest that T-31 may influence the balance between cellular renewal and programmed cell death within aging renal epithelial systems.
T-31 Peptide and Cellular Senescence
Beyond proliferation and apoptosis, T-31 has been investigated for its potential influence on molecular markers commonly associated with cellular senescence.
Experimental studies demonstrated reductions in the cyclin-dependent kinase inhibitors p16 and p21, two proteins that play central roles in establishing senescent cell-cycle arrest. Lower expression of these markers may indicate partial modulation of age-related senescence pathways in cultured renal cells.
Researchers also reported increased expression of SIRT6, a chromatin-associated protein involved in DNA repair, genome stability, metabolic regulation, and telomere maintenance. Since declining SIRT6 expression has been linked with biological aging, increased levels following T-31 exposure may represent an anti-senescence molecular signature within experimental systems.
Mechanistic investigations further proposed that T-31 may interact directly with A/T-rich DNA sequences, potentially altering chromatin accessibility and regulating transcription of genes involved in aging. Although this proposed DNA-binding mechanism requires additional investigation, it provides one possible explanation for the peptide’s observed effects on p16, p21, p53, and SIRT6 expression.
Additional research has also explored T-31’s influence on TNKS2 (Tankyrase 2), a protein involved in telomere regulation, Wnt signaling, and mitotic processes. Modulation of TNKS2 expression suggests another potential avenue through which T-31 may influence cellular aging and differentiation.
T-31 Peptide and Cellular Stress Signaling
T-31 has also been evaluated in laboratory models of cellular stress using aged mesenchymal stem cells.
Research by Ashapkin and colleagues investigated the peptide’s influence on several genes involved in stress adaptation and cellular maintenance, including IGF-1, FOXO1, TERT, TNKS2, and NF-κB.
One of the most notable findings was a substantial increase in IGF-1 gene expression following T-31 exposure. Since IGF-1 serves as a major regulator of anabolic signaling, tissue maintenance, and cellular repair, elevated expression may indicate activation of adaptive pathways that support aging stem cell populations.
Investigators also reported decreased expression of TERT, the catalytic component of telomerase responsible for maintaining telomere length. Rather than indicating reduced function, researchers suggested this observation may reflect a shift toward a more stable transcriptional state in aging cells, although its biological significance remains uncertain.
In addition, T-31 exposure was associated with increased NF-κB expression across multiple cellular aging models. NF-κB regulates numerous inflammatory and stress-response genes, and its activation may represent either a compensatory adaptive response or part of broader stress-related signaling pathways. Further research is needed to clarify the functional significance of these observations.
Note: T-31 peptide is intended exclusively for laboratory research purposes. It is supplied for scientific investigation only and is not approved for human or veterinary use.
