Anti-mPD-L1

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Antibody against murine PD-L1
Anti-mPD-L1

Anti-PD-L1-mIgG1e3 InvivoFit™ is a recombinant monoclonal antibody (mAb) designed for in vivo studies in mice. It features the variable region of the anti-PD-L1 atezolizumab [1] and the engineered murine IgG1e3 constant region.  Programmed cell death ligand 1 (PD-L1; also called B7-H1 or CD274) is a transmembrane protein expressed on antigen-presenting cells. PD-L1 binds to programmed cell death protein 1 (PD-1) on T cells and contributes to T cell exhaustion during chronic infections. Moreover, it has been shown that the engagement of PD-1 on T cells by PD-L1 on tumor cells is associated with the immune escape of tumors. Clinical trials have highlighted the anti-tumor efficacy of blockades targeting the PD-1/PD-L1 pathway [2].  

Atezolizumab (formerly known as MPDL3280A) is a therapeutic mAb that binds human and murine PD-L1, blocking the interaction with its receptor programmed cell death 1 (PD-1). Notably, atezolizumab contains an engineered constant region designed to limit effector functions, such as antibody-dependent cellular cytotoxicity (ADCC) and complement-dependent cytotoxicity (CDC) [3]. However, as it is a humanized antibody, it is immunogenic in mice. To overcome this issue, Anti-PD-L1-mIgG1e3 InvivoFit™ was generated by recombinant DNA technology so that it is ~65% murine (constant region). Importantly, its constant region contains a point mutation D265A (a replacement of aspartic acid by alanine at position 265), resulting in the complete loss of cytolytic effector functions [4].

Anti-PD-L1-mIgG1e3 is provided in an InvivoFit™ grade, a high-quality standard specifically adapted to in vivo studies.

Key features of Anti-PD-L1-mIgG1e3 InvivoFit™:

  • Derived from Atezolizumab (aka MPDL3280A), human IgG1
  • Feature mouse IgG1e3 isotype (constant region)
  • mIgG1e3 (IgG1 with a D265A point mutation) is effectorless
  • Guaranteed sterile, endotoxin level: 1 EU/mg
  • Suitable for parenteral delivery in mice (azide-free)
  • Low aggregation < 5%
  • Produced in animal-free facilities and defined media

Anti-PD-L1-mIgG1e3 InvivoFit™ is produced in Chinese hamster ovary (CHO) cells and purified by affinity chromatography with protein A.  Its binding is validated by flow cytometry and ELISA.

References:

  1. Lesniak W.G. et al., 2016. PD-L1 Detection in Tumors Using [(64)Cu]Atezolizumab with PET. Bioconjug Chem. 27(9):2103-10.
  2. McDermott D. & Atkins M. 2013. PD-1 as a potential target in cancer therapy. Cancer Med. 2(5): 662–673.
  3. Herbst R.S. et al., 2014. Predictive correlates of response to the anti-PD-L1 antibody MPDL3280A in cancer patients. Nature. 515(7528):563-7.
  4. Baudino L. et al., 2008. Crucial role of aspartic acid at position 265 in the CH2 domain for murine IgG2a and IgG2b Fc-associated effector functions. J Immunol. 181(9):6664-9.

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