Overview
CD20 is a protein encoded by the MS4A1 gene, predominantly expressed on the surface of B lymphocytes. It plays a crucial role in B-cell activation and differentiation, making it a significant marker in immunology and hematology. Discovered in the 1980s, CD20 has since become a pivotal target for therapeutic monoclonal antibodies, revolutionizing treatments for B-cell malignancies such as non-Hodgkin lymphoma and chronic lymphocytic leukemia. Research indicates that CD20 is involved in calcium ion transport across the plasma membrane, influencing B-cell receptor signaling. Its expression is restricted to B cells, from pre-B cells to mature B cells, but absent on plasma cells. This selective expression makes it an ideal target for therapies aiming to deplete pathogenic B cells while sparing other immune cells.
Physical and Chemical Properties
CD20 is a non-glycosylated phosphoprotein with a molecular weight of approximately 35-37 kDa. It spans the plasma membrane four times, forming two extracellular loops that serve as binding sites for therapeutic antibodies. The protein is stable under physiological conditions but may degrade if exposed to repeated freeze-thaw cycles or improper storage. Unlike many cell surface proteins, CD20 does not internalize upon antibody binding, which enhances the efficacy of antibody-dependent cellular cytotoxicity (ADCC) and complement-dependent cytotoxicity (CDC). This property is exploited in monoclonal antibody therapies like rituximab, which targets CD20 to induce B-cell lysis.
Main Applications
The primary application of CD20 is in the treatment of B-cell malignancies. Monoclonal antibodies such as rituximab, ofatumumab, and obinutuzumab target CD20 to induce apoptosis or immune-mediated destruction of cancerous B cells. These therapies are standard for conditions like diffuse large B-cell lymphoma and rheumatoid arthritis. CD20 is also used as a diagnostic marker in flow cytometry and immunohistochemistry to identify B-cell populations in clinical and research settings. Its absence or abnormal expression can indicate certain immunodeficiencies or hematological disorders, aiding in precise diagnosis and treatment planning.
Safety and Storage
CD20-related reagents, including antibodies and recombinant proteins, should be stored at -20°C or lower to maintain stability. Avoid repeated freeze-thaw cycles, as this can degrade the protein and reduce efficacy. Always follow the manufacturer's guidelines for reconstitution and handling. In clinical settings, CD20-targeted therapies may cause infusion-related reactions, including fever, chills, and hypotension. Premedication with antihistamines or corticosteroids is often recommended to mitigate these effects. Long-term immunosuppression is a potential risk, necessitating monitoring for infections.
B2B Procurement Guide
When procuring CD20-related products, prioritize suppliers with certifications such as ISO or GMP to ensure quality and consistency. Key considerations include the product's specificity (e.g., for flow cytometry or therapy), purity, and lot-to-lot variability. Request detailed technical data sheets and validation reports. For therapeutic antibodies, evaluate clinical trial data and regulatory approvals (e.g., FDA or EMA). Bulk purchases may qualify for discounts, but ensure proper storage capacity to maintain product integrity. Establish a reliable supply chain to avoid disruptions in research or treatment protocols.
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