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B-hTREM1 mice
Strain Name C57BL/6-Trem1tm1(TREM1)/Bcgen Common Name  B-hTREM1 mice
Background C57BL/6 Catalog number 111180
Related Genes 
CD354, TREM-1
NCBI Gene ID
58271
Targeting strategy


Gene targeting strategy for B-hTREM1 mice. 

The exons 1~4 of mouse Trem1 gene that encode the extracellular domain were replaced by human TREM1 exons 1~4 in B-hTREM1 mice. 


Protein expression analysis

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Strain specific TREM1 expression analysis in homozygous B-hTREM1 mice by flow cytometry. MC38 cells were inoculated into wild-type C57BL/6(+/+) and homozygous B-hTREM1 mice(H/H). Blood and tumor were harvested when tumor volume reached approximately 500 mm3, and analyzed by flow cytometry with species-specific anti-TREM1 antibody. Mouse TREM1 was exclusively detectable in blood and tumor macrophage of wild-type mice. Human TREM1 was exclusively detectable in blood and tumor macrophage of homozygous B-hTREM1 mice. 
* It is not clear what population of cells was stained with specific anti-hTREM1 in tumors of C57BL/6 (Q2).

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Strain specific TREM1 expression analysis in homozygous B-hTREM1 mice by flow cytometry. 

MC38 cells were inoculated into wild-type C57BL/6(+/+) and homozygous B-hTREM1 mice(H/H). Blood and tumor were harvested when tumor volume reached approximately 500 mm3, and analyzed by flow cytometry with species-specific anti-TREM1 antibody. Mouse and human TREM1 were not detectable in blood monocyte of wild-type mice and homozygous B-hTREM1 mice. Human TREM1 was exclusively detectable in tumor M-MDSC of homozygous B-hTREM1 mice. 
* It is not clear what population of cells was stained with specific anti-hTREM1 in tumors of C57BL/6 (Q2).

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Strain specific TREM1 expression analysis in homozygous B-hTREM1 mice by flow cytometry. MC38 cells were inoculated into wild-type C57BL/6(+/+) and homozygous B-hTREM1 mice(H/H). Blood and tumor were harvested when tumor volume reached approximately 500 mm3, and analyzed by flow cytometry with species-specific anti-TREM1 antibody. Mouse TREM1 was exclusively detectable in blood and tumor neutrophil(G-MDSC) of wild-type mice. Human TREM1 was exclusively detectable in blood and tumor neutrophil(G-MDSC)  of homozygous B-hTREM1 mice. 



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Strain specific TREM1 expression analysis in homozygous B-hTREM1 mice by flow cytometry. MC38 cells were inoculated into wild-type C57BL/6(+/+) and homozygous B-hTREM1 mice(H/H). Blood and tumor were harvested when tumor volume reached approximately 500 mm3, and analyzed by flow cytometry with species-specific anti-TREM1 antibody. Mouse and human TREM1 were not detectable in blood and tumor T cells of wild-type mice and homozygous B-hTREM1 mice. 

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Strain specific TREM1 expression analysis in homozygous B-hTREM1 mice by flow cytometry. MC38 cells were inoculated into wild-type C57BL/6(+/+) and homozygous B-hTREM1 mice(H/H). Blood and tumor were harvested when tumor volume reached approximately 500 mm3, and analyzed by flow cytometry with species-specific anti-TREM1 antibody. Mouse and human TREM1 were not detectable in blood and tumor B cells of wild-type mice and homozygous B-hTREM1 mice. 

Analysis of leukocytes cell subpopulation in spleen


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Analysis of spleen leukocyte subpopulations by FACS. Splenocytes were isolated from female C57BL/6 and B-hTREM1 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. Percent of T cell, B cell, NK cell, monocyte, dendritic cell, granulocyte and macrophage in homozygous B-hTREM1 mice were similar to those in the C57BL/6 mice, demonstrating that TREM1 humanized does not change the overall development, differentiation or distribution of these cell types in spleen. Values are expressed as mean ± SEM.

Analysis of T cell subpopulation in spleen


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Analysis of spleen T cell subpopulations by FACS. Splenocytes were isolated from female C57BL/6 and B-hTREM1 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. There were no differences between C57BL/6 and B-hTREM1 mice, demonstrating that humanized of TREM1 does not change the overall development, differentiation or distribution of these T cell subtypes. Values are expressed as mean ± SEM.

Analysis of leukocytes cell subpopulation in LNs


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Analysis of LNs leukocyte subpopulations by FACS. LNs were isolated from female C57BL/6 and B-hTREM1 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. Percent of T cell, B cell, NK cell in homozygous B-hTREM1 mice were similar to those in the C57BL/6 mice, demonstrating that TREM1 humanized does not change the overall development, differentiation or distribution of these cell types in spleen. Values are expressed as mean ± SEM.

Analysis of T cell subpopulation in LNs



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Analysis of LNs T cell subpopulations by FACS. LNs were isolated from female C57BL/6 and B-hTREM1 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. . There were no differences between C57BL/6 and B-hTREM1 mice, demonstrating that humanized of TREM1 does not change the overall development, differentiation or distribution of these T cell subtypes. Values are expressed as mean ± SEM.

Analysis of leukocytes cell subpopulation in blood


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Analysis of blood leukocyte subpopulations by FACS. Blood were isolated from female C57BL/6 and B-hTREM1 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. Percent of T cell, B cell, NK cell, monocyte, dendritic cell, granulocyte and macrophage in homozygous B-hTREM1 mice were similar to those in the C57BL/6 mice, demonstrating that TREM1 humanized does not change the overall development, differentiation or distribution of these cell types in blood. Values are expressed as mean ± SEM.

Analysis of T cell subpopulation in blood

from clipboard


Analysis of blood T cell subpopulations by FACS. Blood were isolated from female C57BL/6 and B-hTREM1 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. There were no differences between C57BL/6 and B-hTREM1 mice, demonstrating that humanized of TREM1 does not change the overall development, differentiation or distribution of these T cell subtypes. Values are expressed as mean ± SEM.


Analysis of hTREM1 function in B-hTREM1 mice


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Analysis of hTREM1 function in B-hTREM1 mice. Wild-type C57BL/6 mice(+/+) and B-hTREM1 mice(H/H) were randomly grouped and injected i.p. with LPS from E.coli(500 ug/mouse). Serum and peritoneal macrophages were collected after LPS administration. Under LPS-stimulated conditions, human TREM1 could be activated effectively and then induced rapid phosphorylation of Syk in B-hTREM1 mice(A). Also, soluble TREM1 were upregulated in the serum of B-hTREM1 mice (B), indicating that mouse MMP was able to proteolytic cleave human TREM1, and induce soluble TREM1 release. ND, not detected.



Tumor growth curve & Body weight changes


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Subcutaneous homograft tumor growth of MC38 cells in B-hTREM1 mice. Wild-type MC38 cells (5x105) were subcutaneously implanted into wild-type C57BL/6 mice and  B-hTREM1 mice (male, 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, MC38 cells were able to establish tumors in B-hTREM1 mice and can be used for efficacy studies.