PX1 Research provides certified, high-purity Cortagen (Ala-Glu-Asp-Pro) engineered specifically for laboratory research into neurodegenerative mechanisms and central nervous system cellular repair. As an established USA-based research peptide supplier, we deliver fully characterized compounds supported by lot-specific analytical documentation for academic and institutional investigators.
PX1 Research provides certified, high-purity Cortagen (Ala-Glu-Asp-Pro) engineered specifically for laboratory research into neurodegenerative mechanisms and central nervous system cellular repair. As an established USA-based research peptide supplier, we deliver fully characterized compounds supported by lot-specific analytical documentation for academic and institutional investigators.
To source research-grade Cortagen for preclinical neurodegenerative disease research, laboratories must partner with verified suppliers providing USA-manufactured tetrapeptides evaluated via RP-HPLC and ESI-MS. PX1 Research supplies high-purity Cortagen (Ala-Glu-Asp-Pro) with lot-specific certificates of analysis, strict endotoxin threshold testing (<0.01 EU/mg), and cold-chain stability controls for rigorous in vitro and animal models.
When purchasing compounds for central nervous system (CNS) investigations, analytical precision is paramount. Minor impurities, residual solvents, or unquantified endotoxins can distort gene expression assays, primary neuronal cell cultures, and animal behavioral data. Institutional buyers require full lot traceability, verified sequence identity, and batch-to-batch consistency from an established research peptide supplier.
Cortagen is a synthetic bioregulatory tetrapeptide comprising the amino acid sequence L-alanyl-L-glutamyl-L-asparagyl-L-proline (Ala-Glu-Asp-Pro). It belongs to a specialized class of short-chain signal peptides designed to interact with chromatin structures and modulate nuclear transcriptional activity within neuronal tissue.
Due to its low molecular weight (~444.43 g/mol) and distinct carboxyl and amino terminals, Cortagen possesses unique conformational flexibility. Preclinical structural modeling indicates that this tetrapeptide can penetrate nuclear membranes without specialized transport systems, allowing direct interaction with specific histone proteins and DNA promoter regions involved in neuronal homeostasis.
Investigators interested in the broader biophysical mechanisms of short-chain peptide bioregulators can review detailed comparative data in our comprehensive peptide bioregulators overview.
In vitro data indicate that Cortagen exerts its primary biological effects by modulating gene expression in cortical and hippocampal neuronal populations. Rather than operating through classical membrane-bound cell surface receptors, short bioregulatory peptides like Cortagen participate in epigenetic regulation by binding directly to the double helix in major and minor grooves of genomic DNA.
Preclinical studies suggest that Cortagen upregulates the transcription of neurotrophic factors, including brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF), while suppressing pro-inflammatory cytokines such as interleukin-1 beta (IL-1β) and tumor necrosis factor-alpha (TNF-α). In cultured primary cortical neurons subjected to oxidative stress or glutamate excitotoxicity, exposure to Cortagen significantly reduced apoptosis rates and preserved mitochondrial membrane potential.
Furthermore, rodent models evaluating age-related cognitive decline and ischemic stroke show that Cortagen administration promotes neurogenesis, enhances synaptic plasticity, and restores functional performance in spatial navigation tasks. These findings highlight Cortagen as a compelling tool for exploring structural repair mechanisms across various neurodegenerative disease paradigms.
When designing protocols for CNS research, investigators frequently compare Cortagen against other short-chain peptide bioregulators and synthetic neuropeptides. Understanding structural and functional distinctions enables precise compound selection for target signaling pathways.
Cortagen is often evaluated alongside Pinealon (Glu-Asp-Arg), another cortical bioregulating tripeptide, as well as systemic bioregulators like Epitalon (Ala-Glu-Asp-Gly). While Pinealon specifically target reactive oxygen species and mitochondrial dynamics within cerebral structures, Cortagen demonstrates broader transcriptional activity regarding nerve growth factor expression and structural synaptic remodeling. Additionally, researchers comparing bioregulators against synthetic neuropeptide analogs frequently analyze outcomes relative to Semax neuroprotection mechanisms, which operate primarily through ACTH-derived neurotrophic pathways rather than direct chromatin interaction.
For valid and reproducible neurodegenerative disease modeling, researchers must verify that purchased Cortagen meets strict quality thresholds. Evaluating a supplier requires scrutinizing four core analytical metrics prior to laboratory deployment:
1. Purity via Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC): The product must exhibit a single, sharp chromatogram peak representing ≥98.0% chemical purity, ensuring the absence of truncated peptide sequences or synthesis side-products.
2. Identity via Electrospray Ionization Mass Spectrometry (ESI-MS): Mass spectrometry must confirm the exact monoisotopic mass of the Ala-Glu-Asp-Pro tetrapeptide, verifying molecular weight and sequence integrity.
3. Endotoxin Quantitation: For primary neuronal cultures and central nervous system microinjections, endotoxin levels must remain strictly below 0.01 EU/mg, measured via Chromogenic Recombinant Factor C (rFC) or Limulus Amebocyte Lysate (LAL) assays to prevent inflammatory artifacts.
4. Residual Solvent and Counter-Ion Analysis: Synthetic peptides purified with trifluoroacetic acid (TFA) must undergo adequate salt exchange or strict TFA quantification to prevent cytotoxicity in delicate cell assays.
Cortagen is supplied as a lyophilized, sterile-filtered white powder to maximize long-term molecular stability. Reconstitution protocols must follow strict aseptic technique within a certified laminar flow hood to maintain product purity.
For baseline solubilization, researchers typically use sterile, non-pyrogenic laboratory-grade water or phosphate-buffered saline (PBS, pH 7.4). Due to its hydrophilic amino acid composition (glutamic acid and aspartic acid residues), Cortagen dissolves rapidly without requiring organic co-solvents such as DMSO or ethanol.
Once reconstituted, stock solutions should be divided into single-use experimental aliquots using low-protein-binding microcentrifuge tubes. This step prevents repeated freeze-thaw cycles, which induce mechanical shear and gradual peptide degradation. For additional technical guidance on preparing research solutions, consult our dedicated research library hub.
To preserve structural integrity over extended experimental timelines, lyophilized Cortagen should be stored at -20°C or -80°C in a desiccated environment upon arrival. Under these conditions, the dry peptide cake remains stable for up to 24 months without measurable loss of purity.
Reconstituted liquid aliquots kept at 2°C to 8°C should be utilized within 7 to 14 days. For long-term storage of liquid stock solutions, samples must be frozen immediately at -80°C, where stability can be maintained for up to 6 months. Exposure to ambient temperatures, light, or basic pH environments accelerates deamidation of the asparagine (Asp) residue, reducing active peptide concentration.
Selecting a trustworthy supplier for neurodegenerative research compounds requires evaluating institutional manufacturing capabilities and transparency standards. PX1 Research adheres to rigorous quality control frameworks designed specifically to support academic, biotechnology, and pharmaceutical research programs.
All PX1 Research compounds are manufactured in ISO 17025-accredited, GMP-compliant facilities within the United States. Every lot undergoes independent, third-party analytical testing with publicly accessible COAs matching the specific vial batch numbers received by your laboratory. Institutional procurement teams managing multi-center grants or high-throughput screening projects can establish preferred fulfillment schedules through our dedicated wholesale account portal.
What is the primary chemical structure and sequence of Cortagen?
Cortagen is a synthetic tetrapeptide consisting of the sequence L-alanyl-L-glutamyl-L-asparagyl-L-proline (Ala-Glu-Asp-Pro), with a molecular weight of approximately 444.43 g/mol.
How is Cortagen purity verified by PX1 Research?
Each lot of Cortagen is subjected to Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) to verify chemical purity ≥98.0%, and Electrospray Ionization Mass Spectrometry (ESI-MS) to confirm sequence identity and correct molecular mass.
What are the recommended endotoxin limits for Cortagen in neuronal assays?
For primary cell culture and neurobiological research, PX1 Research maintains endotoxin levels below 0.01 EU/mg, verified by chromogenic LAL or rFC testing to prevent microglial activation and culture contamination.
How should lyophilized Cortagen be stored upon delivery?
Lyophilized Cortagen should be stored at -20°C or -80°C in a desiccated container protected from light, where it remains stable for up to 24 months.
What is the optimal solvent for reconstituting Cortagen in laboratory settings?
Cortagen dissolves readily in sterile non-pyrogenic water, 0.9% sterile saline, or standard phosphate-buffered saline (PBS, pH 7.4) due to its hydrophilic residue composition.
How does Cortagen differ from Pinealon in preclinical studies?
While both are brain-targeted bioregulating peptides, Cortagen (Ala-Glu-Asp-Pro) primarily modulates gene expression related to neurotrophic factor synthesis (BDNF/NGF), whereas Pinealon (Glu-Asp-Arg) acts heavily on mitochondrial reactive oxygen species suppression.
Does PX1 Research provide lot-specific COAs with Cortagen orders?
Yes. Every shipment of Cortagen includes access to a lot-specific Certificate of Analysis detailing HPLC purity, MS spectrum, endotoxin values, and mass balance data.
Are PX1 Research compounds approved for clinical human administration?
No. All products supplied by PX1 Research, including Cortagen, are strictly intended for laboratory research use only (RUO) and in vitro / animal testing. They are not for human or veterinary medical use.
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.