Overview
EGFR (Epidermal Growth Factor Receptor) is a member of the ErbB family of receptor tyrosine kinases. It is crucial for regulating cell proliferation, survival, and differentiation. Upon binding to ligands like EGF, EGFR undergoes dimerization and autophosphorylation, activating downstream signaling pathways such as MAPK and PI3K/AKT. Dysregulation of EGFR is implicated in various cancers, making it a key target for therapeutic interventions. EGFR is extensively studied in oncology, particularly in non-small cell lung cancer (NSCLC), colorectal cancer, and glioblastoma. Monoclonal antibodies (e.g., cetuximab) and tyrosine kinase inhibitors (e.g., gefitinib) are FDA-approved drugs targeting EGFR. Research on EGFR also extends to wound healing and tissue regeneration, highlighting its multifaceted biological roles.
Physical and Chemical Properties
EGFR is a glycoprotein with a molecular weight of approximately 170 kDa. It consists of an extracellular ligand-binding domain, a transmembrane helix, and an intracellular tyrosine kinase domain. The protein is typically solubilized in buffers containing detergents or glycerol to maintain stability. Its activity is highly dependent on post-translational modifications, including glycosylation and phosphorylation. For laboratory use, EGFR is often supplied as a lyophilized powder or in solution. The protein is sensitive to temperature fluctuations and proteolytic degradation, requiring storage at -20°C or below. Solubility is achieved in PBS or Tris-based buffers, often with added stabilizers like BSA or DTT to prevent aggregation.
Main Applications
EGFR is pivotal in cancer research, serving as a biomarker and therapeutic target. Overexpression or mutations in EGFR are associated with tumor aggressiveness and poor prognosis. Targeted therapies, such as TKIs (e.g., erlotinib) and monoclonal antibodies (e.g., panitumumab), inhibit EGFR signaling to curb tumor growth. These treatments are tailored to patients with specific EGFR mutations, emphasizing personalized medicine. Beyond oncology, EGFR is used in diagnostic kits to detect receptor expression levels in tissue samples. It also has applications in regenerative medicine, where EGF-stimulated pathways promote wound healing. In biotechnology, recombinant EGFR proteins are utilized for drug screening and mechanistic studies, aiding in the development of next-generation therapeutics.
Safety and Storage
Handling EGFR requires standard biosafety precautions. Use personal protective equipment (PPE) such as gloves and lab coats to avoid exposure. While EGFR itself is not classified as hazardous, contamination with endotoxins or impurities from production may pose risks. Always work in a ventilated area and follow institutional safety protocols. For storage, aliquot EGFR solutions to minimize freeze-thaw cycles, which can degrade the protein. Lyophilized powder should be reconstituted with sterile, nuclease-free water or buffer. Long-term stability is ensured at -80°C, with short-term use at 4°C for up to one week. Avoid exposure to light and ensure containers are tightly sealed to prevent moisture absorption.
B2B Procurement Guide
When procuring EGFR for research or industrial use, prioritize suppliers with proven track records in protein production. Request detailed documentation, including Certificate of Analysis (COA), which specifies purity (>95% by SDS-PAGE), endotoxin levels (<1 EU/μg), and functional activity (e.g., kinase assay results). Compare prices across vendors, but prioritize quality over cost savings. Bulk purchases may qualify for discounts, especially for GMP-grade EGFR used in therapeutics. Ensure the supplier complies with regulatory standards (e.g., ISO 13485 for diagnostic applications). For custom modifications (e.g., labeling or tagging), confirm lead times and technical support. Establish a reliable cold chain for shipping to maintain protein integrity.
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