Integral membrane glycoprotein that plays an essential role in the immune response and serves multiple functions in responses against both external and internal offenses. In T-cells, functions primarily as a coreceptor for MHC class II molecule:peptide complex. The antigens presented by class II peptides are derived from extracellular proteins while class I peptides are derived from cytosolic proteins. Interacts simultaneously with the T-cell receptor (TCR) and the MHC class II presented by antigen presenting cells (APCs). In turn, recruits the Src kinase LCK to the vicinity of the TCR-CD3 complex. LCK then initiates different intracellular signaling pathways by phosphorylating various substrates ultimately leading to lymphokine production, motility, adhesion and activation of T-helper cells. In other cells such as macrophages or NK cells, plays a role in differentiation/activation, cytokine expression and cell migration in a TCR/LCK-independent pathway. Participates in the development of T-helper cells in the thymus and triggers the differentiation of monocytes into functional mature macrophages.

推荐稀释比 WB:1/1000-1/2000; IHC:1/100-1/200; IF:1/50-1/200; FC:1/50-1/100

Western blot analysis of CD4 in THP-1 lysates using CD4 antibody.

Immunohistochemistry analysis of paraffin-embedded Human colon using CD4 antibody.High-pressure and temperature Sodium Citrate pH 6.0 was used for antigen retrieval.

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