B-hPD-L1/hTIGIT mice

Basic Information

Strain Name
C57BL/6-Cd274tm1(CD274) Tigittm1(TIGIT)/Bcgen
Stock Number
120532
Common Name
B-hPD-L1/hTIGIT mice
Source/Investigator
Bcgen (Beijing Biocytogen Co., Ltd)
Related Genes
Cd274 (CD274 antigen) Tigit (T cell immunoreceptor with Ig and ITIM domains)
Species
C57BL/6
Appearance:
Black
Genotypes:
Homozygous

Description

PD-L1 (Programmed cell death ligand-1), also known as B7-H1 and CD274, is mainly expressed in antigen-presenting cells (APCs) and activated T cells, and is one of the two ligands of PD-1. The interaction between PD1 and PD-L1 plays an important role in the negative regulation of the immune response. PD-L1 is highly expressed in a variety of solid tumors. PD-1 and PD-L1 interactions can reduce T Cell Activation and promote tumor immune escape. The PD-1/PD-L1 signaling pathway can be blocked and antitumor immune response can be restored by using by anti-PD-1 or anti-PD-L1 antibodies to block the binding of PD1 to PD-L1. TIGIT (T-cell immunoreceptor with Ig and ITIM domains), a member of the immunoglobulin family of PVR (poliovirus receptor), is a type I transmembrane protein. Similar to PD-1, TIM3, and LAG3, TIGIT is highly expressed in cancer tissues and competitively binds to TIGIT receptors with DNAM-1 proteins on the surface of NK cells to reduce the NK cell killing efficiency of cancer cells. Therefore, anti-TIGIT antibody can enhance NK cell ability to destroy tumor cells by facilitating DNAM-1 binding to TIGIT receptors. It has become the new generation of cancer immunotherapy checkpoint.

Targeting Strategy

Gene targeting strategy of B-hPD-L1/hTIGIT mice. The exon 3 of mouse Pd-l1 gene that encodes the extracellular domain was replaced by human PD-L1 exon 3 in B-hPD-L1/hTIGIT mice. The exon 2 of mouse Tigit gene that encodes the extracellular domain was replaced by human TIGIT exon 2 in B-hPD-L1/hTIGIT mice.

Details

Phenotype

Protein Expression Analysis

Splenocytes from B-hPD-L1/hTIGIT mice were analyzed by flow cytometry. mTIGIT+ cells were detectable in C57BL/6 mice, while hTIGIT+ cells were detectable in the homozygous B-hPD-L1/hTIGIT mice.

Splenocytes from B-hPD-L1/hTIGIT mice were analyzed by flow cytometry. mPD-L1+ cells were detectable in C57BL/6 mice, while hPD-L1+ cells were detectable in the homozygous B-hPD-L1/hTIGIT mice.

Application

Combination therapy of hTIGIT Ab and PD-L1 Ab

 

Antitumor activity of anti-hTIGIT antibody combined with anti-hPD-L1 antibody in B-hPD-L1/hTIGIT mice. (A) Anti-hTIGIT antibody combined with anti-hPD-L1 antibody inhibited MC38-hPD-L1 tumor growth in B-hPD-L1/hTIGIT mice. Murine colon cancer MC38-hPD-L1 cells (5×105) were subcutaneously implanted into homozygous B-hPD-L1/hTIGIT mice (female, 5-8 week-old, n=7). Mice were grouped when tumor volume reached approximately 150±50 mm3, at which time they were treated with anti-hTIGIT antibody combined with anti-hPD-L1 antibody and schedules indicated in panel (B) Body weight changes during treatment. As shown in panel A, combination of anti-hTIGIT and anti-hPD-L1 antibody shows more inhibitory effects than individual groups, demonstrating that the B-hPD-L1/hTIGIT mice provide a powerful preclinical model for in vivo evaluating combination therapy efficacy of hTIGIT antibodies and hPD-L1 antibodies . Values are expressed as mean ± SEM.

References

  1. J Clin Invest. 2015 May;125(5):2046-58. doi: 10.1172/JCI80445. Epub 2015 Apr 13.
  2. Immunol Rev. 2017 Mar;276(1):112-120. doi: 10.1111/imr.12518.
  3. Cancer Cell. 2014 Dec 8;26(6):923-937. doi: 10.1016/j.ccell.2014.10.018. Epub 2014 Nov 26.
  4. J Exp Med. 2015 Nov 16;212(12):2165-82. doi: 10.1084/jem.20150792. Epub 2015 Nov 9.
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