Basic Information
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Gene targeting strategy
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Gene targeting strategy for B-hOX40/h4-1BB mice. Exons 1-5 of mouse Ox40 gene (which encode the extracellular domain) were replaced by human OX40 exons 1-5 in B-hOX40/h4-1BB mice. Exons 2-7 of mouse 4-1BB gene (which encode the extracellular domain) were replaced by human 4-1BB exons 2-7 in B-hOX40/h4-1BB mice.
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Protein expression analysis
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Species-specific OX40 expression analysis in homozygous B-hOX40/h4-1BB mice by flow cytometry. Splenocytes were collected from WT and homozygous B-hOX40/h4-1BB (H/H) mice stimulated with or without anti-CD3ε in vivo, and analyzed by flow cytometry with species-specific anti-hOX40 antibody. Mouse OX40 was detectable in T cells of WT mice but not homozygous B-hOX40/h4-1BB mice. Human OX40 was exclusively detectable in T cells of homozygous B-hOX40/h4-1BB mice but not WT mice.
Species-specific 4-1BB expression analysis in homozygous B-hOX40/h4-1BB mice by flow cytometry. Splenocytes were collected from WT and homozygous B-hOX40/h4-1BB (H/H) mice stimulated with or without anti-CD3ε in vivo, and analyzed by flow cytometry with species-specific anti-h4-1BB antibody. Mouse 4-1BB was detectable in T cells of WT mice but not homozygous B-hOX40/h4-1BB mice. Human 4-1BB was exclusively detectable in T cells of homozygous B-hOX40/h4-1BB mice but not WT mice.
Species-specific OX40 expression analysis in homozygous B-hOX40/h4-1BB mice by flow cytometry. Splenocytes were collected from WT and homozygous B-hOX40/h4-1BB (H/H) mice stimulated with or without anti-CD3ε in vivo, and analyzed by flow cytometry with species-specific anti-hOX40 antibody. Mouse OX40 was detectable in CD4+ T cells of WT mice but not homozygous B-hOX40/h4-1BB mice. Human OX40 was exclusively detectable in CD4+ T cells of homozygous B-hOX40/h4-1BB mice but not WT mice.
Species-specific 4-1BB expression analysis in homozygous B-hOX40/h4-1BB mice by flow cytometry. Splenocytes were collected from WT and homozygous B-hOX40/h4-1BB (H/H) mice stimulated with or without anti-CD3ε in vivo, and analyzed by flow cytometry with species-specific anti-h4-1BB antibody. Mouse 4-1BB was detectable in CD4+ T cells of WT mice but not homozygous B-hOX40/h4-1BB mice. Human 4-1BB was exclusively detectable in CD4+ T cells of homozygous B-hOX40/h4-1BB mice but not WT mice.
Species-specific OX40 expression analysis in homozygous B-hOX40/h4-1BB mice by flow cytometry. Splenocytes were collected from WT and homozygous B-hOX40/h4-1BB (H/H) mice stimulated with or without anti-CD3ε in vivo, and analyzed by flow cytometry with species-specific anti-hOX40 antibody. Mouse OX40 was detectable in Treg cells of WT mice but not homozygous B-hOX40/h4-1BB mice. Human OX40 was exclusively detectable in Treg cells of homozygous B-hOX40/h4-1BB mice but not WT mice.
Species-specific 4-1BB expression analysis in homozygous B-hOX40/h4-1BB mice by flow cytometry. Splenocytes were collected from WT and homozygous B-hOX40/h4-1BB (H/H) mice stimulated with or without anti-CD3ε in vivo, and analyzed by flow cytometry with species-specific anti-h4-1BB antibody. Mouse 4-1BB was detectable in Treg cells of WT mice but not homozygous B-hOX40/h4-1BB mice. Human 4-1BB was exclusively detectable in Treg cells of homozygous B-hOX40/h4-1BB mice but not WT mice.
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Immune cell analysis
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Analysis of spleen leukocytes cell subpopulations in B-hOX40/h4-1BB mice
Analysis of spleen leukocyte subpopulations by FACS
Splenocytes were isolated from female C57BL/6 and B-hOX40/h4-1BB mice (n=3, 6-week-old). Flow cytometry analysis of the splenocytes was performed to assess leukocyte subpopulations. A. Representative FACS plots. Single live cells were gated for CD45 population and used for further analysis as indicated here. B. Results of FACS analysis. Percent of T, B, NK, Monocyte, DC and macrophage cells in homozygous B-hOX40/h4-1BB mice were similar to those in the C57BL/6 mice, demonstrating that introduction of hOX40 and h4-1BB in place of its mouse counterpart does not change the overall development, differentiation or distribution of these cell types in spleen.
Analysis of spleen T cell subpopulations in B-hOX40/h4-1BB mice
Analysis of spleen T cell subpopulations by FACS
Splenocytes were isolated from female C57BL/6 and B-hOX40/h4-1BB mice (n=3, 6-week-old). Flow cytometry analysis of the splenocytes was performed to assess leukocyte subpopulations. A. Representative FACS plots. Single live CD45+ cells were gated for CD3 T cell population and used for further analysis as indicated here. B. Results of FACS analysis. Percent of CD8, CD4, and Treg cells in homozygous B-hOX40/h4-1BB mice were similar to those in the C57BL/6 mice, demonstrating that introduction of hOX40 and h4-1BB in place of its mouse counterpart does not change the overall development, differentiation or distribution of these T cell sub types in spleen. Values are expressed as mean ± SEM.
Analysis of lymph node cell subpopulations in B-hOX40/h4-1BB mice
Analysis of lymph node leukocyte subpopulations by FACS
Lymph node were isolated from female C57BL/6 and B-hOX40/h4-1BB mice (n=3, 6-week-old). Flow cytometry analysis of the lymph node cells was performed to assess leukocyte subpopulations. A. Representative FACS plots. Single live cells were gated for CD45 population and used for further analysis as indicated here. B. Results of FACS analysis. Percent of T, B, NK, Monocyte, DC and macrophage cells in homozygous B-hOX40/h4-1BB mice were similar to those in the C57BL/6 mice, demonstrating that introduction of hOX40 and h4-1BB in place of its mouse counterpart does not change the overall development, differentiation or distribution of these cell types in lymph node.
Analysis of lymph node T cell subpopulations in B-hOX40/h4-1BB mice
Analysis of lymph node T cell subpopulations by FACS
Lymph node cells were isolated from female C57BL/6 and B-hOX40/h4-1BB mice (n=3, 6-week-old). Flow cytometry analysis of the lymph node cells was performed to assess lymph node cell subpopulations. A. Representative FACS plots. Single live CD45+ cells were gated for CD3 T cell population and used for further analysis as indicated here. B. Results of FACS analysis. Percent of CD8, CD4, and Treg cells in homozygous B-hOX40/h4-1BB mice were similar to those in the C57BL/6 mice, demonstrating that introduction of hOX40 and h4-1BB in place of its mouse counterpart does not change the overall development, differentiation or distribution of these T cell sub types in lymph node. Values are expressed as mean ± SEM.
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In vivo efficacy
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Combination therapy using an anti-human OX40 and an anti-human 4-1BB antibody in B-hOX40/h4-1BB mice. (A) combination of anti-human OX40 antibody and anti-human 4-1BB antibody inhibited MC38-hPD-L1 tumor growth in B-hOX40/h4-1BB mice. Murine colon cancer MC38-hPD-L1 cells were subcutaneously implanted into homozygous B-hOX40/h4-1BB mice (female, 6-week-old, n=5). Mice were grouped when tumor volume reached approximately 100 mm3, at which time they were treated with anti-human OX40 antibody and anti-human 4-1BB antibody with doses and schedules indicated in panel. (B) Body weight changes during treatment. As shown in panel A, efficacy of combination of anti-human OX40 antibody and anti-human 4-1BB antibody were similar to that of anti-human 4-1BB antibody in controlling tumor growth in B-hOX40/h4-1BB mice. Values are expressed as mean ± SEM.
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References
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- Front. Oncol. 5:117. doi: 10.3389/fonc.2015.00117
- J Immunol. 2012 January 15; 188(2): 892–901. doi:10.4049/jimmunol.1101373
- Journal for Immuno Therapy of Cancer 2014, 2 (Suppl 3): P105
