CD28抗体-抗体-抗体-生物在线
北京索莱宝科技有限公司
CD28抗体

CD28抗体

商家询价

产品名称: CD28抗体

英文名称: CD28

产品编号: bs-1297R

产品价格: null

产品产地: 北京

品牌商标: BIOSS

更新时间: 2025-01-08T10:30:41

使用范围: WB=1:100-500,ELISA=1:500-1000,IHC-P=1:100-500,IHC-F=1:100-500,IF=1:100-500,

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Human CD28 antigen is a 44 kDa disulfide linked homodimeric T cell specific surface glycoprotein. It is a cell adhesion molecule of the immunoglobulin superfamily which is constitutively expressed on most peripheral blood T lymphocytes (approximately 95% of CD4+ cells and 50% of CD8+ cells). Mature thymocytes exhibit higher levels of CD28 than the immature cells. Activation of T cells results in enhanced CD28 expression. T cell activation requires two combined signals provided by antigen presenting cells. The first is mediated via the T cell receptor following its interaction with antigenic peptide MHC complexes, and the second is delivered by accessory or costimulating molecules through their counter receptors on T lymphocytes. CD28 bears structural homology to CTLA 4 which is expressed at very low levels on the surface of CD4+ and CD8+ peripheral blood cells only following activation. CD28 is the natural receptor for the B7/BB 1 ligand (CD80) a 55-60 kDa glycoprotein which is expressed on activated B lymphocytes, on dendritic cells and on interferon gamma treated monocytes. The binding of B7 1/BB 1 molecules to CD28 is involved in T lymphocyte activation and in the initiation and maintenance of chronic inflammation.