Basic Information
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Targeting strategy
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Gene targeting strategy for B-hPD-1/hPD-L1 mice. The exon 2 of mouse PD-1 gene that encodes the IgV domain was replaced by human PD-1 exon 2 in B-hPD-1/hPD-L1 mice. The exon 3 of mouse Pdl1 gene that encodes the IgV domain was replaced by human PD-L1 exon 3 in B-hPD-1/hPD-L1 mice. This double knock-in model, was developed by breeding the B-hPD-1 mice and the B-hPD-L1 mice.
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mRNA expression analysis
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Strain specific analysis of PD-1 and PD-L1 gene expression in WT and B-hPD-1/hPD-L1 mice by RT-PCR. Mouse Pd-1 and PD-L1 mRNA was detected in splenocytes of wild-type (+/+) mice. Human PD-1 and PD-L1 mRNA was detected in H/H but not in +/+ mice.
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Protein expression analysis
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Strain specific PD1 and PD-L1 expression analysis in homozygous B-hPD-1/hPD-L1 mice by flow cytometry. Splenocytes were collected from WT and homozygous B-hPD-1/hPD-L1 (H/H) mice stimulated with anti-CD3ε in vivo , and analyzed by flow cytometry with species-specific anti-PD-1 and anti-PD-L1 antibodies. Mouse PD-1 and PD-L1 were exclusively detectable in WT mice. Human PD-1 and PD-L1 were exclusively detectable in homozygous B-hPD-1/hPD-L1 mice but not in WT mice.
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Blood routine test of B-hPD-1/hPD-L1 mice
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Complete blood count (CBC)
Blood from female C57BL/6 and B-hPD-1/hPD-L1 mice (n = 5, 6 weeks-old) was collected and analyzed by CBC. There was no differences among any measurement between C57BL/6 and B-hPD-1/hPD-L1 mice.
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Blood chemistry of B-hPD-1/hPD-L1 mice
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Blood chemistry tests of B-hPD-1/hPD-L1 mice. Serum from the C57BL/6 and B-hPD-1/hPD-L1 mice (n = 3, 6 week-old) was collected and analyzed for levels of biochemistry. There was no differences on AST, ALB, GLU, CHOL, CREA measurement between C57BL/6 and B-hPD-1/hPD-L1,. ALT, TRIG, UREA have significant changes compared to wild-type mice. Values are expressed as mean ± SEM.
Blood chemistry tests of B-hPD-1/hPD-L1 mice. Serum from the C57BL/6 and B-hPD-1/hPD-L1 mice (n = 3, 6 week-old) was collected and analyzed for levels of biochemistry. There was no differences on AST, ALB, GLU, CHOL, CREA measurement between C57BL/6 and B-hPD-1/hPD-L1. Values are expressed as mean ± SEM.
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In vivo efficacy of anti-human PD-1 antibody
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Antitumor activity of anti-human PD-1 antibody in B-hPD-1/hPD-L1 mice. (A) Anti-human PD-L1 antibody Pembrolizumab (in house) inhibited B-hPD-L1 MC38 plus tumor growth in B-hPD-1/hPD-L1 mice. Murine colon cancer B-hPD-L1 MC38 plus cells (5×105) were subcutaneously implanted into homozygous B-hPD-1/hPD-L1 mice (male, 8-week-old, n=5). Mice were grouped when tumor volume reached approximately 80mm3, at which time they were treated with anti-human PD-1 antibody with doses and schedules indicated in panel. (B) Body weight changes during treatment. As shown in panel A, different doses of human PD-1 antibody inhibited tumor growth in different levels, demonstrating that the B-hPD-1/hPD-L1 mice provide a powerful preclinical model for in vivo evaluation of anti-human PD-1 antibodies. Values are expressed as mean ± SEM.
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In vivo efficacy of anti-human PD-L1 antibody
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Antitumor activity of anti-human PD-L1 antibody in B-hPD-1/hPD-L1 mice. (A) Anti-human PD-L1 antibody atezolizumab (in house) inhibited B-hPD-L1 MC38 plus tumor growth in B-hPD-1/hPD-L1 mice. Murine colon cancer B-hPD-L1 MC38 plus cells (5×105) were subcutaneously implanted into homozygous B-hPD-1/hPD-L1 mice (male, 5-week-old, n=5). Mice were grouped when tumor volume reached approximately 100 mm3, at which time they were treated with anti-human PD-L1 antibody with doses and schedules indicated in panel. (B) Body weight changes during treatment. As shown in panel A, different doses of human PD-L1 antibody inhibited tumor growth in different levels, demonstrating that the B-hPD-1/hPD-L1 mice provide a powerful preclinical model for in vivo evaluation of anti-human PD-L1 antibodies. Values are expressed as mean ± SEM.
