Name: a human peripheral blood mononuclear cell (pbmc) engrafted humanized xenograft model for translational immuno-oncology (i-o) research
Uploaded: 2019-08-15T14:00:00
Description: Watch this Scientific Journal Video about A Human Peripheral Blood Mononuclear Cell PBMC Engrafted Humanized Xenograft Model for Translational Immuno-oncology I-O Research at JoVE.com

We thank members of our laboratories for helpful discussions. This work was partially supported by the Biomedical and Life Science Innovation and Cultivation Research Program of the Beijing Municipal Science and Technology Commission under Grant Agreement No. Z151100003915070 (project &#34;Preclinical study on a novel immune oncology anti-tumor drug BGB-A317&#34;), and it was also partially supported by internal company funding for preclinical research.

All procedures performed in studies involving human participants were in accordance with the ethical standards of BeiGene and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study. All procedures performed in studies involving animals were approved by the Internal Review Board at BeiGene. This protocol has been specifically adjusted for the evaluation of BGB-A317 (...

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Our knowledge of cancer development and progression has advanced significantly in recent years, with focus on a comprehensive understanding of both the tumor cells and its associated stroma. Harnessing the host immune mechanisms could induce a greater impact against cancer cells, representing a promising treatment strategy. Murine models with intact mouse immune systems, such as syngeneic and GEM models, have been widely used to study checkpoint-mediated immunity. Efficacy assessments using these models depend largely on...

Immuno-oncology (I-O) is a rapidly expanding field of cancer treatment. Researchers have recently started to appreciate the therapeutic potential of modulating functions of the immune system to attack tumors. Immune checkpoint blockades have demonstrated encouraging activities in a variety of cancer types, including melanoma, renal cell carcinoma, head and neck, lung, bladder and prostate cancers1,2. Contrary to targeted therapies that directly kill &#160;cancer cells, I-O therapies potentiate the body&#8217;s immune system to attack tumors3.
To date, numerous relevant I-O animal models have been established. These include: 1) mouse tumor cell lines or tumor homograft in syngeneic mice; 2) spontaneous tumors derived from genetically engineered mouse (GEM) or carcinogen-induction; 3) chimeric GEMs with the knock-in of human drug target(s) in a functional murine immune system; and 4) mice with reconstituted human immunity transplanted with human cancer cells or patient-derived xenografts (PDXs). Each of these models have obvious advantages as well as limitations, which have been described and reviewed extensively elsewhere4.
Reconstitution of human immunity in immunodeficient mice have been growingly appreciated as a clinically relevant approach for translational I-O research. This is usually achieved through either 1) engraftment of adult immune cells (e.g., peripheral blood mononuclear cells (PMBC))5,6, or 2) engraftment of hematopoietic stem cells (HSC) from, for example, umbilical cord blood or fetal liver7,8. These humanized mice could support the growth of human tumors, thus allowing the assessment of I-O therapies in the context of both human immunity and human cancers. Despite the advantages, applications of humanized mice in I-O research were usually hindered by several concerns, such as long model development time and considerably high cost.
Here, we describe a human PBMC-based model that could be widely applied for translational I-O studies. This model is comparatively time- and cost-effective with high reproducibility in efficacy studies. It has been used in-house for the evaluations of several I-O therapeutics currently under preclinical and clinical development. BGB-A317 (Tislelizumab), an investigational humanized anti-PD-1 antibody9 , is used as the example to discuss model development, characterization, and possible applications for anti-tumor efficacy analyses.

<table border="0" cellpadding="0" cellspacing="0" style="width:955px;" width="955">
	<colgroup>
		<col />
		<col />
		<col />
		<col />
	</colgroup>
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:408px;">PBMC separation /cell culture</td>
			<td style="width:211px;"></td>
			<td style="width:193px;"></td>
			<td style="width:143px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Histopaque-1077</td>
			<td style="width:211px;">Sigma</td>
			<td style="width:193px;">10771</td>
			<td style="width:143px;">Cell isolation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">DMEM</td>
			<td style="width:211px;">Corning</td>
			<td style="width:193px;">10-013-CVR</td>
			<td style="width:143px;">Cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">DPBS</td>
			<td style="width:211px;">Corning</td>
			<td style="width:193px;">21-031-CVR</td>
			<td style="width:143px;">Cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">FBS</td>
			<td style="width:211px;">Corning</td>
			<td style="width:193px;">35-076-CV</td>
			<td style="width:143px;">Cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Penicillin-Streptomycin, Liquid</td>
			<td style="width:211px;">Gibco</td>
			<td style="width:193px;">15140-163</td>
			<td style="width:143px;">Cell culture</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Trypsin-EDTA (0.25%), phenol red</td>
			<td style="width:211px;">Gibco</td>
			<td style="width:193px;">25200-114</td>
			<td style="width:143px;">Cell culture</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:408px;">Matrigel</td>
			<td style="width:211px;">Corning</td>
			<td style="width:193px;">356237</td>
			<td style="width:143px;">CDX inoculation</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:408px;">FACS analysis</td>
			<td style="width:211px;"></td>
			<td style="width:193px;"></td>
			<td style="width:143px;"></td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:408px;">Deoxyribonuclease I from bovine pancreas</td>
			<td style="width:211px;">Sigma</td>
			<td style="width:193px;">DN25</td>
			<td style="width:143px;">Sample preparation</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:408px;">Collagenase Type I</td>
			<td style="width:211px;">Sigma</td>
			<td style="width:193px;">C0130</td>
			<td style="width:143px;">Sample preparation</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Anti-mouse/human CD11b (M1/70) antibody</td>
			<td style="width:211px;">BioLegend</td>
			<td style="width:193px;">101206</td>
			<td style="width:143px;">FACS</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Anti-mouse Ly-6C (HK1.4) antibody</td>
			<td style="width:211px;">BioLegend</td>
			<td style="width:193px;">128008</td>
			<td style="width:143px;">FACS</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Anti-mouse Ly-6G (1A8) antibody</td>
			<td style="width:211px;">BioLegend</td>
			<td style="width:193px;">127614</td>
			<td style="width:143px;">FACS</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Anti-human CD8 (OKT8) antibody</td>
			<td style="width:211px;">Sungene Biotech</td>
			<td style="width:193px;">H10082-11H</td>
			<td style="width:143px;">FACS</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Anti-human CD279 (MIH4) antibody</td>
			<td style="width:211px;">eBioscience</td>
			<td style="width:193px;">12-9969-42</td>
			<td style="width:143px;">FACS</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Anti-human CD3 (HIT3a) antibody</td>
			<td style="width:211px;">4A Biotech</td>
			<td style="width:193px;">--</td>
			<td style="width:143px;">FACS</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:408px;">Guava easyCyte 8HT Benchtop Flow Cytometer</td>
			<td style="width:211px;">Millipore</td>
			<td style="width:193px;">0500-4008</td>
			<td style="width:143px;">FACS</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:408px;">Tumor/PDX implantation /dosing / measurement</td>
			<td style="width:211px;"></td>
			<td style="width:193px;"></td>
			<td style="width:143px;"></td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:408px;">Cyclophosphamide</td>
			<td style="width:211px;">J&#38;K</td>
			<td style="width:193px;">Cat#419656, CAS#6055-19-2</td>
			<td style="width:143px;">In vivo efficacy</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:408px;">Disulfiram</td>
			<td style="width:211px;">J&#38;K</td>
			<td style="width:193px;">Cat#591123, CAS#97-77-8</td>
			<td style="width:143px;">In vivo efficacy</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Syringe</td>
			<td style="width:211px;">BD</td>
			<td style="width:193px;">300841</td>
			<td style="width:143px;">CDX inoculation</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:408px;">Hypodermic needles (14G)</td>
			<td style="width:211px;">Shanghai SA Mediciall &#38; Plastic Instruments Co., Ltd.</td>
			<td style="width:193px;">0.7*32 TW SB</td>
			<td style="width:143px;">PDX inoculation</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:408px;">Vernier Caliper (MarCal)</td>
			<td style="width:211px;">Mahr</td>
			<td style="width:193px;">16ER</td>
			<td style="width:143px;">Tumor measurement</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:408px;">IVC individual ventilated cages</td>
			<td style="width:211px;">Lingyunboji Ltd.</td>
			<td style="width:193px;">IVC-128</td>
			<td style="width:143px;">Animal facility</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:408px;">IHC</td>
			<td style="width:211px;"></td>
			<td style="width:193px;"></td>
			<td style="width:143px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Leica ASP200 Vacuum tissue processor</td>
			<td style="width:211px;">Leica</td>
			<td style="width:193px;">ASP200</td>
			<td style="width:143px;">IHC</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:408px;">Leica RM2235 Manual Rotary Microtome for Routine Sectioning</td>
			<td style="width:211px;">Leica</td>
			<td style="width:193px;">RM2235</td>
			<td style="width:143px;">IHC</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Leica EG1150 H Heated Paraffin Embedding Module</td>
			<td style="width:211px;">Leica</td>
			<td style="width:193px;">EG1150 H</td>
			<td style="width:143px;">IHC</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Ariol-Clinical IHC and FISH Scanner</td>
			<td style="width:211px;">Leica</td>
			<td style="width:193px;">Ariol</td>
			<td style="width:143px;">IHC</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Anti-human CD8 (EP334) antibody</td>
			<td style="width:211px;">ZSGB-Bio</td>
			<td style="width:193px;">ZA-0508</td>
			<td style="width:143px;">IHC</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Anti-human PD1 [NAT105] antibody</td>
			<td style="width:211px;">Abcam</td>
			<td style="width:193px;">ab52587</td>
			<td style="width:143px;">IHC</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:408px;">Anti-human PD-L1 (E1L3N) antibody</td>
			<td style="width:211px;">Cell Signaling Technology</td>
			<td style="width:193px;">13684S</td>
			<td style="width:143px;">IHC</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:408px;">Polink-2 plus Polymer HRP Detection System</td>
			<td style="width:211px;">ZSGB-Bio</td>
			<td style="width:193px;">PV-9001/9002</td>
			<td style="width:143px;">IHC</td>
		</tr>
	</tbody>
</table>

a human peripheral blood mononuclear cell (pbmc) engrafted humanized xenograft model for translational immuno-oncology (i-o) research

The discovery and development of immuno-oncology (I-O) therapy in recent years represents a milestone in the treatment of cancer. However, treatment challenges persist. Robust and disease-relevant animal models are vital resources for continued preclinical research and development in order to address a range of additional immune checkpoints. Here, we describe a human peripheral blood mononuclear cell (PBMC) &#8212; based humanized xenograft model. BGB-A317 (Tislelizumab), an investigational humanized anti-PD-1 antibody in late-stage clinical development, is used as an example to discuss platform set-up, model characterization and drug efficacy evaluations. These humanized mice support the growth of most human tumors tested, thus allowing the assessment of I-O therapies in the context of both human immunity and human cancers. Once established, our model is comparatively time- and cost-effective, and usually yield highly reproducible results. We suggest that the protocol outlined in this article could serve as a general guideline for establishing mouse models reconstituted with human PBMC and tumors for I-O research.

Following the procedures presented here, a PBMC-based humanized xenograft model was successfully established. In brief, CP myeloablation effects in NOD/SCID mice was determined by flow cytometry analysis of neutrophil and monocyte populations post CP and DS treatment (Figure 1). 100 mg/kg CP plus 125 mg/kg DS was determined as the optimal dose and used in later studies as the regimen results in maximum depletion of neutrophils and monocytes without causing severe toxicity to mice. Next, huma...

Watch this Scientific Journal Video about A Human Peripheral Blood Mononuclear Cell PBMC Engrafted Humanized Xenograft Model for Translational Immuno-oncology I-O Research at JoVE.com

A Human Peripheral Blood Mononuclear Cell PBMC Engrafted Humanized Xenograft Model for Translational Immuno-oncology I-O Research

We describe a human peripheral blood mononuclear cell (PBMC) &#8212; based humanized xenograft mouse model for translational immuno-oncology research. This protocol could serve as a general guideline for establishing and characterizing similar models for I-O therapy assessment.

A Human Peripheral Blood Mononuclear Cell (PBMC) Engrafted Humanized Xenograft Model for Translational Immuno-oncology (I-O) Research

The discovery and development of immuno-oncology (I-O) therapy in recent years represents a milestone in the treatment of cancer. However, treatment ...

Our protocol can serve as a general guideline for establishing mouse models reconstituted with human PBMC and tumors for immuno-oncology research. These procedures provide a cost-effective and highly reproducible approach for partially reconstituting human immunity in human tumor-bearing mice through subcutaneous and mixing of human PBMC with cancer xenografts. Demonstrating the procedures with me will be Xinxin Cui, Yanjuan Zhang, Huichen Bai and Xiaolong Yang, sent us from the Pharmacology Department.For myeloid cell depletion intra peritoneally deliver 100mg per kilogram of cyclophosphamide and orally deliver 125mg per kilogram of disulfiram to six to eight week old NOD/SCID female mice once a day for two days. 24 hours after the second dose of cyclophosphamide and disulfiram, resuspend five times 10 of the six freshly isolated human PBMC and 2.5 times 10 of the six human tumor cell line cells and 200 microliters of PBS plus 50%metrogel per animal and inject the entire volume subcutaneously into the right flank of each experimental animal. Measure and record the primary tumor volume two times a week for four to six weeks.When the tumors reach an average volume of 200 to 500 millimeters cubed, use optomic scissors to harvest whole tumor from each animal. PBMC donors tumor cell lines and patient derived xenografts that result in a moderate tumor growth with relatively high PD-1, PD-L1 and CD8 expression should be used for subsequent analysis. For immunohistochemical analysis of the harvested tumor tissues, fix the samples and formalin 24 to 72 hours before dehydration and embedding of the tissues in paraffin.Obtain three micrometer sections of the embedded tissues on polylysine coated slides and deparaffinize the samples with three seven minute xylene immersions. After the third treatment, hydrate the sections with three minute graded alcohol immersions. Then rinse the slide in deionized water three times and remove any excess liquid from the slides.To perform antigen retrieval, place the slides in a container and cover the slides with 10 millimolar sodiocitrate buffer. Heat the slides, container, in a microwave for three minutes before placing the slides in a 95 degrees Celsius water bath for 30 minutes. After cooling to room temperature, rinse the slides three times in deionized water and aspirate any excess liquid from the slides.Incubate with 0.3%hydrogen peroxide for 10 minutes to block endogenous peroxidase activity followed by blocking with 3%BSA and PBS for one hour. At the end of the hydrogen peroxide incubation, label the slides with the appropriate primary antibodies at four degrees Celsius overnight. The next morning, treat the slides with horseradish peroxidase conjugated secondary antibody for one hour at room temperature before applying the substrate dropwise onto the slides until an appropriate level of brown staining is observed by light microscopy.Next, stain the samples with hematoxylin. After one minute, stop the reaction with distilled water followed by a five second submersion in 0.5%hydrochloric acid alcohol and five seconds in 0.5%ammonia water. Then dehydrate the samples with three ascending three minute ethanol and three, five minute xylene immersion.To assess the antitumor activity of a candidate drug of interest, initiate the treatment on the day of the cell inoculation according to the planned experimental protocol and monitor the primary tumor volume twice a week for four to six weeks. For PharmaCODE dynamic analysis of the tumor infiltrated immune cells, mince the tumor tissues into small pieces and digest the fragments with collagenase type one and DNase I and RPMI-1640 medium plus 5%FBS for 30 minutes at 37 degrees Celsius. At the end of the digestion, filter the digested tissue through a 40 micrometer cell strainer to obtain a single cell suspension and collect the cells by centrifugation.Resuspend the pellet at a one times 10 of the seventh cells per milliliter of ice cold fax buffer concentration and transfer an equal volume of cells to the appropriate number of wells in a 96-well round bottom plate. Collect the cells by centrifugation and resuspend the pellets in 20 micrograms per milliliter of human IGG for 30 minutes to block any nonspecific binding. Then stain the cells with the appropriate primary antibodies for 30 minutes at four degrees Celsius before their analysis by flow cytometry according to standard protocols.As demonstrated, 100 milligrams per kilogram cyclophosphamide and 125 milligrams per kilogram disulfiram myeloablation results in a significant depletion of neutrophils and monocytes four days post-treatment. After human PBMC and tumor transplantation, the presence of human immune cell infiltrates can be verified within the tumor microenvironment by immunohistochemistry. An in vivo screening of a panel of PBMC donors can be performed to confirm the presence of a relatively high immune cell infiltration into the tumor microenvironment in an acceptable tumor growth rate.Human cancer cell lines in patient derived xenografts of different cancer types can also be evaluated to assess the tumor growth rate and immune cell infiltration. In this representative experiment, treatment of the PBMC and grafted humanized mice with humanized anti-PD1 antibody resulted in significant antitumor activities. Disulfiram decreases urotoxicity of cyclophosphamide, the combination may exert longer lasting neutropenia effects in mice.The exact dose regimen of cyclophosphamide and disulfiram may need to be predetermined. Newer strains of more immunodeficient mice for easier human immunity reconstitution and decreased xenogenic GvHD effect have been established and are pending further investigations with our documented protocol. Our model is useful for evaluating T-cell engaging cancer immune therapies, particularly when working on short timelines or for selecting agents before moving to a more complex multilineage immunity model.

Research

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Cancer Research

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Tumor Engraftment in a Xenograft Mouse Model of Human Mantle Cell Lymphoma

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Development of a Human Preclinical Model of Osteoclastogenesis from Peripheral Blood Monocytes Co-cultured with Breast Cancer Cell Lines

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Automated Multiplex Immunofluorescence Panel for Immuno-oncology Studies on Formalin-fixed Carcinoma Tissue Specimens

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Patient-derived Orthotopic Xenograft Models for Human Urothelial Cell Carcinoma and Colorectal Cancer Tumor Growth and Spontaneous Metastasis

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Patient-derived Heterogeneous Xenograft Model of Pancreatic Cancer Using Zebrafish Larvae as Hosts for Comparative Drug Assessment

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A Melanoma Patient-Derived Xenograft Model

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Establishment of Gastric Cancer Patient-derived Xenograft Models and Primary Cell Lines

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Isolating Human Peripheral Blood Mononuclear Cells and CD4+ T cells from S&#233;zary Syndrome Patients for Transcriptomic Profiling

Cutaneous T-cell lymphomas (CTCL) are derived from the transformation and uncontrolled proliferation of mature skin-homing T cells, and mycosis fungoides ...

Circulating Tumor Cell Lines: an Innovative Tool for Fundamental and Translational Research

Metastasis is a leading cause of cancer death. Despite improvements in treatment strategies, metastatic cancer has a poor prognosis. We thus face an ...