CD28 Polyclonal Antibody

• Background:

  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.

• Structure Composition:

  0.01M TBS (pH7.4) with 1% BSA, 0.03% Proclin300 and 50% Glycerol.

• Product Name Alternative:

  CD 28; CD28 antigen; CD28 molecule; MGC138290; T cell antigen CD28; T cell specific surface glycoprotein; T cell specific surface glycoprotein CD28; Tp44.

• Swiss Prot:

  P31041

• Reactivity:

  Human, Mouse, Rat, Chicken, Dog, Pig, Cow, Horse

• Immunogen:

  KLH conjugated synthetic peptide derived from mouse CD28:1-120/218

• Conjugation:

  Unconjugated

• Applications:

  WB

• Dilution:

  WB=1:500-2000

• Purity:

  Affinity purified by Protein A

• Modification:

  Unmodification

• Molecular Weight:

  50 kD, 44kD

• Storage Conditions:

  Store at 4°C short term. Aliquot and store at -20°C long term. Avoid freeze-thaw cycles.

• Notes:

  For research use only, not for use in diagnostic procedure.

• Specificity:

  CD28 Polyclonal Antibody detects endogenous levels of CD28 protein.

• Applications Notes:

  Primary: Anti-CD28 at 1/1000 dilution

• Host or Source:

  Rabbit

• CAS Number:

  9007-83-4