Cortagen (Ala-Glu-Asp-Pro) is a synthetic Khavinson bioregulator peptide extensively evaluated in cell culture and animal models for its ability to modulate chromatin accessibility and gene expression profiles. PX1 Research supplies analytical-grade Cortagen specifically synthesized for laboratory researchers investigating cardiovascular epigenetics, neural signaling, and transcriptional regulation. Every batch is manufactured in the USA and verified by independent ISO 17025 accredited laboratories using RP-HPLC and mass spectrometry.
Cortagen (Ala-Glu-Asp-Pro) is a synthetic Khavinson bioregulator peptide extensively evaluated in cell culture and animal models for its ability to modulate chromatin accessibility and gene expression profiles. PX1 Research supplies analytical-grade Cortagen specifically synthesized for laboratory researchers investigating cardiovascular epigenetics, neural signaling, and transcriptional regulation. Every batch is manufactured in the USA and verified by independent ISO 17025 accredited laboratories using RP-HPLC and mass spectrometry.
Research-grade Cortagen (Ala-Glu-Asp-Pro) for cardiac gene expression studies is available from specialized peptide suppliers like PX1 Research strictly for in vitro and preclinical investigation. Preclinical literature demonstrates that Cortagen acts as a short-chain bioregulator capable of penetrating cellular and nuclear membranes to interact directly with DNA histone complexes. In cardiovascular laboratory models, this interaction modulates mRNA synthesis, anti-apoptotic signaling pathways, and structural protein transcription during oxidative or ischemic stress.
When purchasing Cortagen for quantitative PCR (qPCR), Western blotting, or transcriptomic profiling, researchers require verifiable purity and strict batch consistency. Impurities, trifluoroacetate (TFA) residual salts, or high endotoxin levels can artifactually alter cellular gene expression, masking the genuine transcriptional effects of the peptide. PX1 Research provides batch-specific Certificates of Analysis (COAs) detailing lot purity, mass identity, and endotoxin levels to ensure reproducible results across longitudinal research trials.
Cortagen is a synthetic tetrapeptide with the primary amino acid sequence L-Alanyl-L-alpha-glutamyl-L-alpha-aspartyl-L-proline (Ala-Glu-Asp-Pro, or AEDP). Derived from the class of short-chain Khavinson peptides, Cortagen was designed based on the amino acid sequence analysis of natural organ extracts, optimized for stability and specific nuclear interactions. With a molecular formula of C17H26N4O9 and a molecular mass of approximately 430.41 g/mol, it represents one of the smallest bioactive peptide sequences capable of epigenetic regulation.
The chemical architecture of Cortagen features carboxylic acid functional groups on the glutamate and aspartate residues, alongside the rigid pyrrolidine ring of proline. This spatial arrangement allows the peptide to adopt specific conformations that facilitate electrostatic interactions with the major and minor grooves of double-stranded DNA. In comparative nuclear binding assays, this specific charge distribution enables AEDP to bind selectively to histone-DNA complexes, influencing local chromatin condensation without requiring carrier proteins or transfection reagents.
The fundamental mechanism of Cortagen in molecular biology centers on peptide-chromatin interaction. In vitro studies demonstrate that short-chain synthetic peptides such as AEDP cross nuclear envelope membranes via passive diffusion or specific nuclear pore transport mechanisms. Once inside the nucleus, Cortagen binds to specific promoter regions of genes involved in cellular maintenance, stress responses, and tissue homeostasis.
Researchers investigating cardiac gene expression focus on how Cortagen alters the histone acetylation and DNA methylation landscape. By disrupting non-specific repressor complex binding or promoting euchromatin formation (open chromatin state), AEDP enables RNA polymerase II complexes to access promoter sequences more efficiently. Laboratory models show that this epigenetic modulation triggers differential expression of protective heat shock proteins, antioxidant enzymes, and cell survival factors under experimental stressors such as hypoxia or nutrient deprivation.
In animal models of myocardial stress and localized ischemia, administration of Cortagen has been evaluated for its potential to alter gene expression patterns within cardiomyocytes and vascular endothelial cells. Quantitative gene expression profiling in rodent models demonstrates that exposure to AEDP downregulates pro-inflammatory cytokines such as interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-alpha), while simultaneously upregulating anti-apoptotic regulators including Bcl-2.
Furthermore, preclinical experiments analyzing extracellular matrix (ECM) gene expression reveal that Cortagen modulates the transcription of matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs). In laboratory models of cardiac remodeling, this regulatory effect on gene transcription helps maintain structural collagen homeostasis, mitigating hyperplastic tissue changes following experimental injury. These observations make Cortagen a valuable reference compound for investigators studying myocardial repair pathways and genomic stability in cardiovascular disease models.
To understand the unique transcriptional activity of Cortagen, researchers frequently contrast its performance against other short-chain bioregulators within the Khavinson class. While Cortagen (AEDP) exhibits targeted activity toward neural and cardiac gene networks, related peptides target distinct tissue systems and chromatin sites. Evaluating these structural variants side-by-side provides critical insight into sequence-dependent epigenetic signaling.
For example, Epitalon (Ala-Glu-Asp-Gly) differs from Cortagen by a single terminal amino acid (glycine instead of proline), shifts focus toward telomerase activation and pineal gland gene expression. Similarly, Vilon (Lys-Glu) is a dipeptide prioritized for immune cell gene regulation and fibroblast activation, whereas Thymogen (Glu-Trp) is predominantly studied for T-lymphocyte differentiation. Comparing these analogs in parallel transcriptomic assays allows laboratories to map how subtle sequence alterations impact promoter binding specificity and gene activation cascades across diverse target tissues.
Cortagen is supplied as a sterile, lyophilized (freeze-dried) powder to maximize chemical stability during transport and storage. For laboratory reconstitution, researchers should use aseptic technique inside a certified laminar flow hood. Standard reconstitutions utilize sterile 0.9% Sodium Chloride, Phosphate-Buffered Saline (PBS, pH 7.4), or sterile Water for Injection, depending on downstream assay compatibility.
To reconstitute a typical 5 mg vial of Cortagen, introduce 1.0 mL to 2.0 mL of chosen diluent along the internal glass wall of the vial, allowing the liquid to gently wet the lyophilized cake. Avoid vigorous vortexing or agitation, which can induce physical shear stress; instead, gently swirl the vial until complete dissolution is achieved. Stock solutions prepared for cell culture assays typically target concentrations between 1 mM and 10 mM, which can be further diluted into culture media to achieve nano- to micromolar working concentrations standard in gene expression assays.
Lyophilized Cortagen powder should be stored at -20°C for short-to-medium term storage (up to 12 months) or at -80°C for long-term storage to prevent peptide hydrolysis or degradation. Vials should be kept in a desiccated container away from direct light exposure. Prior to opening sealed vials, allow the container to reach room temperature to prevent condensation from accumulating inside the vial, which could initiate premature peptide degradation.
Once reconstituted into aqueous solution, Cortagen stock solutions are stable at 2°C to 8°C for up to 7 to 14 days. For extended utility, reconstituted solutions should be aliquoted into single-use polypropylene microtubes and stored at -20°C or -80°C. Repeated freeze-thaw cycles must be rigorously avoided, as phase transitions induce physical degradation and aggregation, compromising concentration accuracy across analytical runs. Refer to the overall PX1 research library for additional chemical stability protocols.
Rigorous quality verification is imperative when purchasing Cortagen for gene expression research. Minor chemical impurities, truncted sequences, or synthesis side-products can interfere with cellular receptors and nuclear binding sites, generating false-positive or irreproducible gene regulation data. PX1 Research enforces stringent quality assurance standards for all research peptides.
Purity is assessed using Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC), ensuring that the final product meets a minimum threshold of 98.0% purity. Electrospray Ionization Mass Spectrometry (ESI-MS) confirms exact molecular mass (430.41 Da), validating sequence accuracy without identity ambiguities. Furthermore, because bacterial endotoxins (lipopolysaccharides) directly trigger inflammatory gene networks (e.g., NF-kB pathways) in cultured cells, every lot undergoes chromogenic LAL endotoxin testing to guarantee levels remain well below critical research thresholds (<0.05 EU/mg).
PX1 Research is a dedicated USA-based supplier committed to supporting university laboratories, pharmaceutical institutes, and independent research facilities with pure research compounds. All peptides in our catalog are synthesized in GMP-compliant facilities and tested by independent ISO 17025 accredited analytical laboratories within the United States. We do not distribute consumer products, clinical formulations, or non-verified imports.
Researchers ordering through PX1 Research benefit from full lot traceability, public access to batch COAs, and fast fulfillment. Orders ship directly from our state-of-the-art logistics centers in California and Arizona, with same-day dispatch for orders placed Monday through Friday before 3:00 PM EST. Explore our complete selection of bioregulators and synthetic peptides via our all peptides catalog, or set up a laboratory account for bulk procurement through our wholesale portal.
What is Cortagen and what is its primary focus in preclinical research?
Cortagen (Ala-Glu-Asp-Pro) is a synthetic short-chain Khavinson bioregulator peptide. In preclinical research, it is primarily studied for its ability to cross nuclear membranes, bind chromatin, and modulate gene expression related to stress response, apoptosis, and tissue repair in cardiac and neuronal cell models.
How does Cortagen influence cardiac gene expression in cell culture?
In vitro and animal models indicate that Cortagen interacts with DNA histone complexes, promoting chromatin remodeling. This leads to altered transcription rates of key targets, including upregulating anti-apoptotic proteins (such as Bcl-2) and modulating matrix metalloproteinase gene expression under hypoxic or oxidative stress conditions.
What analytical methods are used to verify the purity of Cortagen?
PX1 Research verifies Cortagen purity using Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) to ensure chemical purity exceeds 98.0%. Mass Spectrometry (MS) is performed to confirm precise molecular weight, and LAL assays test for bacterial endotoxins.
What is the recommended reconstitution medium for Cortagen for laboratory assays?
For standard laboratory and cell culture assays, Cortagen is typically reconstituted in sterile Phosphate-Buffered Saline (PBS, pH 7.4), sterile 0.9% Sodium Chloride solution, or laboratory-grade sterile Water for Injection.
How should reconstituted Cortagen stock solutions be stored?
Reconstituted Cortagen should be aliquoted into single-use microcentrifuge tubes and stored at -20°C or -80°C to avoid repeated freeze-thaw cycles. Short-term storage of working solutions at 2°C to 8°C is acceptable for up to 7-14 days.
How does Cortagen differ structurally from Epitalon?
Cortagen is a tetrapeptide with the sequence Ala-Glu-Asp-Pro (AEDP), whereas Epitalon is a tetrapeptide with the sequence Ala-Glu-Asp-Gly (AEDG). The replacement of proline with glycine alters spatial conformation and specific target gene binding affinities.
Why is endotoxin testing critical when evaluating peptides for gene expression studies?
Bacterial endotoxins (LPS) activate cellular Toll-like receptors (TLR4), triggering massive inflammatory gene transcription cascades (e.g., NF-kB activation). If a research peptide contains high endotoxin levels, observed gene expression changes may stem from endotoxin contamination rather than the peptide itself.
Is Cortagen supplied by PX1 Research intended for human clinical use?
No. All products offered by PX1 Research, including Cortagen, are strictly intended for laboratory research, in vitro experiments, and preclinical animal models. They are not for human or veterinary medical use, therapy, or clinical administration.
All products are sold strictly for laboratory and research use only. Not for human or veterinary use, diagnosis, treatment or consumption. Statements have not been evaluated by the FDA.