B-hCD16A mice

Basic Information

Targeting strategy

Gene targeting strategy for B-hCD16A mice. The regulatory region and exons 1~5 of mouse Fcgr4 gene that encode the full-length protein were replaced by human FCGR3A(F158V) exons 1~6 and regulatory region in B-hCD16A mice.

mRNA expression analysis

Strain specific analysis of CD16A gene expression in wild-type mice and homozygous B-hCD16A mice by RT-PCR.

Mouse Fcgr4 mRNA was exclusively detectable in wild-type mice and human FCGR3A mRNA was exclusively detectable in homozygous B-hCD16A mice (H/H).

Protein expression analysis in NK cells

Strain specific CD16A expression analysis in wild-type C57BL/6 mice and homozygous B-hCD16A mice by flow cytometry.

Splenocytes were collected from wild-type C57BL/6 mice(+/+)  and homozygous B-hCD16A mice (H/H). Human CD16A was exclusively detectable in the NK cells of homozygous B-hCD16A mice.

Protein expression analysis in macrophages

Strain specific CD16A expression analysis in wild-type C57BL/6 mice and homozygous B-hCD16A mice by flow cytometry. Peritoneal exudative macrophages(PEMs) were collected from wild-type C57BL/6 mice(+/+)  and homozygous B-hCD16A mice(H/H). Mouse CD16A was exclusively detectable in wild-type C57BL/6 mice. Human CD16A was exclusively detectable in homozygous B-hCD16A mice.

Protein expression analysis in multiple lymphocyte subtypes

NK cells

Strain specific CD16A expression analysis in wild-type C57BL/6 mice and homozygous B-hCD16A mice by flow cytometry.

Different tissues were collected from wild-type C57BL/6 mice(+/+)  and homozygous B-hCD16A mice (H/H). Human CD16A was exclusively detectable in the NK cells of homozygous B-hCD16A mice.

B cells

Strain specific CD16A expression analysis in wild-type C57BL/6 mice and homozygous B-hCD16A mice by flow cytometry.

Different tissues were collected from wild-type C57BL/6 mice(+/+)  and homozygous B-hCD16A mice (H/H). Mouse CD16A and human CD16A was not detectable in B cell of wild-type C57BL/6 mice or homozygous B-hCD16A mice.

T cells

Strain specific CD16A expression analysis in wild-type C57BL/6 mice and homozygous B-hCD16A mice by flow cytometry.

Different tissues were collected from wild-type C57BL/6 mice(+/+)  and homozygous B-hCD16A mice (H/H). Mouse CD16A and human CD16A was not detectable in T cell of wild-type C57BL/6 mice or homozygous B-hCD16A mice.

CD4+ T cells

Strain specific CD16A expression analysis in wild-type C57BL/6 mice and homozygous B-hCD16A mice by flow cytometry.

Different tissues were collected from wild-type C57BL/6 mice(+/+)  and homozygous B-hCD16A mice (H/H). Mouse CD16A and human CD16A was not detectable in CD4+ T cell of wild-type C57BL/6 mice or homozygous B-hCD16A mice.

CD8+ T cells

Strain specific CD16A expression analysis in wild-type C57BL/6 mice and homozygous B-hCD16A mice by flow cytometry.

Different tissues were collected from wild-type C57BL/6 mice(+/+)  and homozygous B-hCD16A mice (H/H). Mouse CD16A and human CD16A was not detectable in CD8+ T cell of wild-type C57BL/6 mice or homozygous B-hCD16A mice.

Treg cells

Strain specific CD16A expression analysis in wild-type C57BL/6 mice and homozygous B-hCD16A mice by flow cytometry.

Different tissues were collected from wild-type C57BL/6 mice(+/+)  and homozygous B-hCD16A mice (H/H). Mouse CD16A and human CD16A was not detectable in Treg cell of wild-type C57BL/6 mice or homozygous B-hCD16A mice.

DCs

Strain specific CD16A expression analysis in wild-type C57BL/6 mice and homozygous B-hCD16A mice by flow cytometry.

Different tissues were collected from wild-type C57BL/6 mice(+/+)  and homozygous B-hCD16A mice (H/H). Mouse CD16A was exclusively detective in DCs of wild-type mice. Human CD16A was detectable in DCs of homozygous B-hCD16A mice at a very low expression level.

Granulocytes

Strain specific CD16A expression analysis in wild-type C57BL/6 mice and homozygous B-hCD16A mice by flow cytometry.

Different tissues were collected from wild-type C57BL/6 mice(+/+)  and homozygous B-hCD16A mice (H/H). Mouse CD16A was exclusively detective in granulocytes of wild-type mice. Human CD16A was not detectable in granulocytes of wild-type C57BL/6 mice or homozygous B-hCD16A mice.

Monocytes

Strain specific CD16A expression analysis in wild-type C57BL/6 mice and homozygous B-hCD16A mice(v2) by flow cytometry. Different tissues were collected from wild-type C57BL/6 mice(+/+)  and homozygous B-hCD16A mice (H/H). Mouse CD16A was not detective in monocytes of wild-type mice. Human CD16A was exclusively detectable in monocytes of homozygous B-hCD16A mice.

Macrophages

Strain specific CD16A expression analysis in wild-type C57BL/6 mice and homozygous B-hCD16A mice by flow cytometry. Different tissues were collected from wild-type C57BL/6 mice(+/+)  and homozygous B-hCD16A mice (H/H). Mouse CD16A was exclusively detective in macrophages of wild-type mice. Human CD16A was exclusively detectable in macrophages of homozygous B-hCD16A mice .

Protein expression analysis in NK cells

Strain specific CD16A expression level analysis in NK cells of homozygous B-hCD16A mice and human PBMCs by flow cytometry. 

Analysis of leukocytes subpopulation in B-hCD16A mice

Analysis of spleen leukocyte subpopulations by FACS. Splenocytes were isolated from female C57BL/6 and B-hCD16A 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 the CD45+ population and used for further analysis as indicated here. B. Results of FACS analysis. Values are expressed as mean ± SEM.

Analysis of spleen T cell subpopulations in B-hCD16A mice

Analysis of spleen T cell subpopulations by FACS. Splenocytes were isolated from female C57BL/6 and B-hCD16A 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 TCRβ+T cell population and used for further analysis as indicated here. B. Results of FACS analysis. Values are expressed as mean ± SEM.

Analysis of leukocytes subpopulation in B-hCD16A mice

Analysis of LNs leukocyte subpopulations by FACS. LNs were isolated from female C57BL/6 and B-hCD16A mice (n=3, 6-week-old). Flow cytometry analysis of the LNs was performed to assess leukocyte subpopulations. A. Representative FACS plots. Single live cells were gated for the CD45+ population and used for further analysis as indicated here. B. Results of FACS analysis. Values are expressed as mean ± SEM.

Analysis of LNs T cell subpopulations in B-hCD16A mice

Analysis of LNs T cell subpopulations by FACS. LNs were isolated from female C57BL/6 and B-hCD16A mice (n=3, 6-week-old).  Flow cytometry analysis of the LNs was performed to assess leukocyte subpopulations. A. Representative FACS plots. Single live CD45+ cells were gated for TCRβ+T cell population and used for further analysis as indicated here. B. Results of FACS analysis. Values are expressed as mean ± SEM.

Analysis of leukocytes subpopulation in B-hCD16A mice

Analysis of blood leukocyte subpopulations by FACS. Blood were isolated from female C57BL/6 and B-hCD16A mice (n=3, 6-week-old). Flow cytometry analysis of the blood was performed to assess leukocyte subpopulations. A. Representative FACS plots. Single live cells were gated for the CD45+ population and used for further analysis as indicated here. B. Results of FACS analysis. Values are expressed as mean ± SEM.

Analysis of blood T cell subpopulations in B-hCD16A mice

Analysis of blood T cell subpopulations by FACS. Blood were isolated from female C57BL/6 and B-hCD16A mice (n=3, 6-week-old).  Flow cytometry analysis of the blood was performed to assess leukocyte subpopulations. A. Representative FACS plots. Single live CD45+ cells were gated for TCRβ+T cell population and used for further analysis as indicated here. B. Results of FACS analysis. Values are expressed as mean ± SEM.

Tumor growth curve & Body weight changes

Subcutaneous homograft tumor growth of B-hCLDN18.2 MC38 cells, B-hBCMA MC38 cells and B-hB7-H3 MC38 cells in B-hCD16A mice.

B-hCLDN18.2 MC38 cells, B-hBCMA MC38 cells and B-hB7-H3 MC38 cells (5×10⁵) and wild-type MC38 cells (5×10⁵) were subcutaneously implanted into B-hCD16A mice (female, 8-week-old, n=6). Tumor volume and body weight were measured twice a week. (A) Average tumor volume ± SEM. (B)  Body weight (Mean± SEM). Volume was expressed in mm³ using the formula: V=0.5 X long diameter X short diameter². As shown in panel A, B-hCLDN18.2 MC38 cells, B-hBCMA MC38 cells and B-hB7-H3 MC38 cells were able to establish tumors in B-hCD16A mice and can be used for efficacy studies.

Subcutaneous homograft tumor growth of B-hEPCAM MC38 cells, B-hROR1 MC38 cells and B-hLILRB4 MC38 in B-hCD16A mice.

B-hEPCAM MC38 cells, B-hROR1 MC38 cells and B-hLILRB4 MC38 (5×10⁵) and wild-type MC38 cells (5×10⁵) were subcutaneously implanted into B-hCD16A mice (female, 8-week-old, n=8). Tumor volume and body weight were measured twice a week. (A) Average tumor volume ± SEM. (B)  Body weight (Mean± SEM). Volume was expressed in mm³ using the formula: V=0.5 X long diameter X short diameter². As shown in panel A, B-hEPCAM MC38 cells, B-hROR1 MC38 cells and B-hLILRB4 MC38 were able to establish tumors in B-hCD16A mice and can be used for efficacy studies.

Subcutaneous homograft tumor growth of B-hCD19 MC38 cells and B-hTPBG MC38 in B-hCD16A mice.

B-hCD19 MC38 cells, B-hTPBG MC38 (5×10⁵) and wild-type MC38 cells (5×10⁵) were subcutaneously implanted into B-hCD16A mice (female, 8-week-old, n=8). Tumor volume and body weight were measured twice a week. (A) Average tumor volume ± SEM. (B)  Body weight (Mean± SEM). Volume was expressed in mm³ using the formula: V=0.5 X long diameter X short diameter². As shown in panel A, B-hCD19 MC38 cells and B-hTPBG MC38 were able to establish tumors in B-hCD16A mice and can be used for efficacy studies.

Subcutaneous homograft tumor growth of B-hCLDN6 MC38 cells in B-hCD16A mice.

B-hCLDN6 MC38 (5×10⁵) and wild-type MC38 cells (5×10⁵) were subcutaneously implanted into B-hCD16A mice (female, 8-week-old, n=8). Tumor volume and body weight were measured twice a week. (A) Average tumor volume ± SEM. (B)  Body weight (Mean± SEM). Volume was expressed in mm³ using the formula: V=0.5 X long diameter X short diameter². As shown in panel A, B-hCLDN6 MC38 cells was able to establish tumors in B-hCD16A mice and can be used for efficacy studies.

Antitumor activity of anti-human CD16A-based Ab in B-hCD16A mice

Antitumor activity of anti-human CD16A-based Ab in B-hCD16A mice.

(A) Anti-human CD16A-based Ab inhibited MC38 tumor growth in B-hCD16A mice. Murine colon cancer MC38 cells were subcutaneously implanted into homozygous B-hCD16A mice (female,13 week-old, n=7). Mice were grouped when tumor volume reached approximately 70 mm³, at which time they were treated with anti-human CD16A-based Ab with doses and schedules indicated in panel B. (B) Body weight changes during treatment. As shown in panel A, anti-human CD16A-based Ab was efficacious in controlling tumor growth in B-hCD16A mice, demonstrating that the B-hCD16A mice provide a powerful preclinical model for in vivo evaluation of anti-human CD16A-based Ab. Values are expressed as mean ± SEM.