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Purified Anti-Human CD8a (Hit8a)

Sizes available: 100 µg

Bulk Sizes: 1mg, 25mg, 50mg

*Bulk sizes have a standard lead time of 2 weeks. Customer will be notified if lead time exceeds 2 weeks.

Applications: FC, IHC
SKU: 70-0089
Product Name Price Qty
Purified Anti-Human CD8a (Hit8a) ..... Cat.No. 70-0089-U100 ..... Size 100 µg
Bulk Purified Anti-Human CD8a (Hit8a) ..... Cat.No. 70-0089-B001 ..... Size 1 mg
Bulk Purified Anti-Human CD8a (Hit8a) ..... Cat.No. 70-0089-B025 ..... Size 25 mg
Bulk Purified Anti-Human CD8a (Hit8a) ..... Cat.No. 70-0089-B050 ..... Size 50 mg



The Hit8a antibody is specific for the 32-34 kDa alpha chain of human CD8, known as CD8a or CD8 alpha. CD8a can form a homodimer (CD8 alpha-alpha), but is more commonly expressed as a heterodimer with a second chain known as CD8b or CD8 beta. CD8 acts as a co-receptor for antigen recognition and subsequent T cell activation that is initiated upon binding of the T cell receptor (TCR) to antigen-bearing MHC Class I molecules. The cytoplasmic domains of CD8 provide binding sites for the tyrosine kinase lck, facilitating intracellular signaling events that lead to T cell activation, development, and cytotoxic effector functions. CD8+ cytotoxic T cells (CTLs) play an important role in inducing cell death of tumor cells, as well as cells infected by virus, bacteria or parasites.

The Hit8a antibody is widely used as a phenotypic marker for CD8 on cytotoxic T cells, thymocytes, as well as on certain cell types that do not also express the TCR, including some NK cells and lymphoid dendritic cells. If used together with an alternative Anti-Human CD8a clone RPA-T8, the Hit8a antibody will not block binding of RPA-T8 to CD8a.

Additional Info

Additional Info

Name Purified Anti-Human CD8a (Hit8a)
Cat. No. 70-0089
Technical Data Sheet Download TDS
Alternative Names CD8 alpha, leu-2a
Gene ID 925
Clone Hit8a
Isotype Mouse IgG1, kappa
Reactivity Human
Cross Reactivity Chimpanzee, Rhesus
Format Purified
Application Flow Cytometry, IHC

Coppieters KT, Dotta F, Amirian N, Campbell PD, Kay TWH, Atkinson MA, Roep BO and von Herrath MG. 2012. J. Exp. Med. 109: 51-60. (in situ tetramer staining / Immunohistochemistry – frozen tissue)

Kumari A, Brendel C, Hochlaus A, Neubauer A, and Burchert A. 2012. Blood. 119: 530-539. (Flow cytometry)

Kryczek I, Banerjee M, Cheng P, Vatan L, et al. 2009. Blood. 114: 1141 – 1149. (Immunofluorescence microscopy)

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Application Key:
FC = Flow Cytometry; FA = Functional Assays; ICC = Immunocytochemistry; IHC = Immunohistochemistry; IHCF = Immunohistochemistry, Frozen Tissue; IHCP = Immunohistochemistry, Paraffin-Embedded Tissue;
IF = Immunofluorescence Microscopy; IP = Immunoprecipitation; WB = Western Blot; EM = Electron Microscopy

*Tonbo Biosciences tests all antibodies by flow cytometry. Citations are provided as a resource for additional applications that have not been validated by Tonbo Biosciences. Please choose the appropriate format for each application and consult the Materials and Methods section for additional details about the use of any product in these publications.