The T-cell receptor (TCR) is a surface marker specific for T cells. TCR regulates T cell function and participates in human immune responses by recognizing and binding to exogenous antigens to prevent immune dysregulation and inflammatory responses. Because of its transient intracellular fragments, TCR requires intracellular molecules to assist in signaling. Among these, the CD3 molecule is one of the most important molecules. CD3 molecules are involved in TCR structural stability as well as T cell activation signaling. The TCR – CD3 complex is generated when the TCR and CD3 form a noncovalent bond. Both antigen recognition and T-cell signaling are facilitated by the TCR-CD3 complex. When the CD3 subunit is absent, the TCR – CD3 complex cannot form, and no subunits are transported to the cell surface. In addition to its direct involvement in T-cell activation, CD3 is also involved in immune regulation through interactions with other immune molecules. Abnormal expression or dysregulation of CD3 has been implicated in several diseases, including autoimmune diseases, immunodeficiency disease, and tumors.

At present, various drugs targeting CD3 are constantly under development, and taking drugs alone or together with other products to treat diseases has become a new method and remarkable achievements have been made. CD3 protein has shown important research value and application prospects in tumor biology, and drug research and development. With further research and technological advances, CD3 protein products are also essential. Alpha Lifetech can provide CD3 corresponding products and help each customer's research and development. Alpha Lifetech focuses on high-precision detection development and validation services to support drug screening and biosimilar discovery. Our detection methods, including ELISA, cell-based functional testing, and flow cytometry, have undergone rigorous sensitivity, specificity, and reproducibility testing. In addition to testing and development, our team also provides data analysis, scheme optimization, and cross-species reactivity testing to ensure reliable results.