Overview
PD1 (Programmed Cell Death Protein 1) is a critical immune checkpoint receptor belonging to the CD28 family. First identified in 1992, this cell surface protein plays a pivotal role in regulating T-cell activity and maintaining immune tolerance. PD1 is expressed on activated T cells, B cells, and myeloid cells, functioning as a 'brake' on immune responses to prevent autoimmunity and excessive inflammation. In the tumor microenvironment, cancer cells often exploit the PD1 pathway to evade immune detection by expressing its ligands PD-L1 and PD-L2. This discovery led to the development of groundbreaking PD1 inhibitors that have revolutionized cancer immunotherapy, particularly for malignancies like melanoma, non-small cell lung cancer, and Hodgkin's lymphoma.
Physical and Chemical Properties
PD1 is a type I transmembrane protein with a molecular weight of approximately 50-55 kDa when glycosylated. The extracellular region contains an immunoglobulin variable (IgV)-like domain that mediates interactions with its ligands PD-L1 and PD-L2. The intracellular portion features an immunoreceptor tyrosine-based inhibitory motif (ITIM) and an immunoreceptor tyrosine-based switch motif (ITSM) that transmit inhibitory signals. As a research reagent, PD1 is typically supplied as a recombinant protein produced in mammalian expression systems to ensure proper glycosylation and folding. The protein's stability depends on proper storage conditions, with lyophilized forms generally stable at -20°C and solution forms requiring careful handling to prevent aggregation or degradation.
Main Applications
The primary application of PD1 in biotechnology and pharmaceuticals is as a target for cancer immunotherapy. PD1 inhibitors (checkpoint inhibitors) such as pembrolizumab and nivolumab have become standard treatments for multiple cancers. These monoclonal antibodies block PD1 signaling, allowing T cells to recognize and attack tumor cells more effectively. Beyond oncology, PD1 research extends to infectious diseases (chronic viral infections), autoimmune disorders (where PD1 agonists may be therapeutic), and transplantation medicine. In research settings, recombinant PD1 proteins are used for assay development, antibody screening, and mechanistic studies of immune regulation.
Safety and Storage
PD1-related materials require careful handling due to their biological activity. Recombinant proteins should be stored at recommended temperatures (-20°C or -80°C for long-term storage) and protected from repeated freeze-thaw cycles. Working solutions should typically be prepared in sterile, endotoxin-free buffers and used promptly. For therapeutic PD1 inhibitors, clinicians must monitor for immune-related adverse events (irAEs) including pneumonitis, colitis, hepatitis, and endocrinopathies. Research laboratories should implement appropriate biosafety level (BSL) precautions when working with PD1-expressing cell lines or related biological materials.
B2B Procurement Guide
When procuring PD1-related products, buyers should consider several critical factors. For recombinant proteins, verify the expression system (mammalian preferred for proper glycosylation), purity level (>90% typically required for research), and biological activity (often confirmed by binding assays). Endotoxin levels should be <1 EU/μg for most applications. For therapeutic antibodies, ensure suppliers comply with current Good Manufacturing Practice (cGMP) standards. Pricing varies significantly based on quantity, purity, and application (research vs. clinical grade). Consider working with suppliers who provide comprehensive characterization data and batch-specific certificates of analysis. Lead times for custom PD1 products can range from weeks to months depending on complexity.
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