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B-hCTLA4/h4-1BB mice
Strain Name C57BL/6-Ctla4tm1(CTLA4)Cd137tm1(CD137)/Bcgen Common Name  B-hCTLA4/h4-1BB mice
Background C57BL/6 Catalog number  120539
Related Genes 
CTLA4 (Cytotoxic T-lymphocyte-associated protein 4,CD152)
TNFRSF9 (Tumor necrosis factor receptor superfamily, member 9)
Gene description

CTLA4 (cytotoxic T-lymphocyte-associated protein 4), also known as CD152, competitively binds to B7-1 (CD80) and B7-2 (CD86) on Antigen-Presenting Cells (APCs) to block the T cell activating signal by B7 and CD28 (on T cells) interaction. The inhibition of CTLA4 by its inhibitory antibodies enhances T cell activity. The CTLA4 antibody is the first FDA-approved antibody to treat advanced melanoma. 

TNFRSF9 (Tumor necrosis factor receptor super family, member 9), also called CD137 and 4-1BB, is a co-stimulatory molecule and is mainly expressed on the surface of T, NK and mononuclear cells. CD137 is activated by its ligand CD137L or activating anti-CD137 antibodies, resulting in T Cell Activation, proliferation and cytokine production. CD137L is expressed on antigen presenting cells such as dendritic cells and macrophages and activated B cells. In vivo studies show that CD137 activation increases anti-tumor immune responses, providing a new target for immunotherapy.


Protein expression analysis


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Strain specific 4-1BB expression analysis in homozygous B-hCTLA4/h4-1BB mice by flow cytometry. Splenocytes were collected from WT and homozygous B-hCTLA4/h4-1BB (H/H) mice stimulated with anti-CD3ε in vivo, and analyzed by flow cytometry with species-specific anti-h4-1BB antibody. Mouse 4-1BB was detectable in WT mice but not homozygous B-hCTLA4/h4-1BB mice. Human 4-1BB was exclusively detectable in homozygous B-hCTLA4/h4-1BB mice but not WT mice.


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Strain specific CTLA4 expression analysis in homozygous B-hCTLA4/h4-1BB mice by flow cytometry. 

Splenocytes were collected from WT and homozygous B-hCTLA4/h4-1BB (H/H) mice stimulated with anti-CD3ε in vivo, and analyzed by flow cytometry with species-specific anti-hCTLA4 antibody. Mouse CTLA4 was detectable in WT mice but not homozygous B-hCTLA4/h4-1BB mice. Human CTLA4 was exclusively detectable in homozygous B-hCTLA4/h4-1BB mice but not WT mice.