Efficacy of an anti-CD5-ricin a chain immunoconjugate in an improved human peripheral blood lymphocyte-reconstituted severe combined immunodeficient mouse model

Severe combined immunodeficient mice reconstituted with human peripheral blooldlymphocytes (hu-PBL-SCID mice) were used to evaluate in vivo efficacy of a mouse IgG1 monoclonal antibody (mAb)-ricin toxin A chain immunoconjugate (H65-RTA) directed against the CD5 cell surface antigen present on human...

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Veröffentlicht in:International journal of immunopharmacology 1993-08, Vol.15 (6), p.695-709
Hauptverfasser: Kohn, Fred R., Fishwild, Dianne M., Kung, Ada H.C.
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creator Kohn, Fred R.
Fishwild, Dianne M.
Kung, Ada H.C.
description Severe combined immunodeficient mice reconstituted with human peripheral blooldlymphocytes (hu-PBL-SCID mice) were used to evaluate in vivo efficacy of a mouse IgG1 monoclonal antibody (mAb)-ricin toxin A chain immunoconjugate (H65-RTA) directed against the CD5 cell surface antigen present on human T-cells. Initial studies demonstrated that plasma levels of human soluble interleukin-2 receptor (sIL-2R) are predictive of human T-cell engraftment in spleens and blood of SCID mice transplanted with human PBL. Therefore, chimeric mice with detectable plasma levels of human sIL-2R were used in subsequent studies. Systemic injection of such mice with H65-RTA resulted in a significant depletion of human T-cells from spleens, blood and bone marrow, and a decrease in plasma levels of human sIL-2R as compared to vehicle-treated control animals. The effect of H65-RTA was dose-dependent, treatment schedule-dependent, and mAb-specific, as an isotype-, linker- and toxin-matched immunoconjugate of irrelevant binding specificity was not efficacious. Moreover, human T-cells remained depleted from SCID tissues for at least 10 days after cessation of H65-RTA treatment, indicating that the cells were killed by the immunoconjugate. Unconjugated H65 mAb and an H65-derived F(ab′) 2-RTA conjugate, but not unconjugated F(ab′) 2, were also efficacious, suggesting that the Fc portion of the mAb and the toxin moiety may both play a role in the mechanism of human T-cell depletion by H65-RTA in this model. Results indicate that the hu-PBL-SCID mouse model can be used to compare in vivo efficacy of immunosuppressive agents specifically directed against human T-cells.
doi_str_mv 10.1016/0192-0561(93)90142-L
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Initial studies demonstrated that plasma levels of human soluble interleukin-2 receptor (sIL-2R) are predictive of human T-cell engraftment in spleens and blood of SCID mice transplanted with human PBL. Therefore, chimeric mice with detectable plasma levels of human sIL-2R were used in subsequent studies. Systemic injection of such mice with H65-RTA resulted in a significant depletion of human T-cells from spleens, blood and bone marrow, and a decrease in plasma levels of human sIL-2R as compared to vehicle-treated control animals. The effect of H65-RTA was dose-dependent, treatment schedule-dependent, and mAb-specific, as an isotype-, linker- and toxin-matched immunoconjugate of irrelevant binding specificity was not efficacious. Moreover, human T-cells remained depleted from SCID tissues for at least 10 days after cessation of H65-RTA treatment, indicating that the cells were killed by the immunoconjugate. Unconjugated H65 mAb and an H65-derived F(ab′) 2-RTA conjugate, but not unconjugated F(ab′) 2, were also efficacious, suggesting that the Fc portion of the mAb and the toxin moiety may both play a role in the mechanism of human T-cell depletion by H65-RTA in this model. Results indicate that the hu-PBL-SCID mouse model can be used to compare in vivo efficacy of immunosuppressive agents specifically directed against human T-cells.</description><subject>Animals</subject><subject>Antigens, CD - immunology</subject><subject>Biological and medical sciences</subject><subject>CD5 Antigens</subject><subject>Dose-Response Relationship, Drug</subject><subject>Humans</subject><subject>Immunoglobulins - blood</subject><subject>Immunomodulators</subject><subject>Immunotoxins - administration &amp; dosage</subject><subject>Immunotoxins - pharmacology</subject><subject>Lymphocyte Depletion</subject><subject>Lymphocyte Transfusion</subject><subject>Medical sciences</subject><subject>Mice</subject><subject>Mice, SCID</subject><subject>Pharmacology. 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Drug treatments</topic><topic>Receptors, Interleukin-2 - analysis</topic><topic>Ricin - pharmacology</topic><topic>T-Lymphocytes - transplantation</topic><topic>Transplantation, Heterologous</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kohn, Fred R.</creatorcontrib><creatorcontrib>Fishwild, Dianne M.</creatorcontrib><creatorcontrib>Kung, Ada H.C.</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Immunology Abstracts</collection><collection>AIDS and Cancer Research Abstracts</collection><jtitle>International journal of immunopharmacology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kohn, Fred R.</au><au>Fishwild, Dianne M.</au><au>Kung, Ada H.C.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Efficacy of an anti-CD5-ricin a chain immunoconjugate in an improved human peripheral blood lymphocyte-reconstituted severe combined immunodeficient mouse model</atitle><jtitle>International journal of immunopharmacology</jtitle><addtitle>Int J Immunopharmacol</addtitle><date>1993-08-01</date><risdate>1993</risdate><volume>15</volume><issue>6</issue><spage>695</spage><epage>709</epage><pages>695-709</pages><issn>0192-0561</issn><eissn>1879-3495</eissn><coden>IJIMDS</coden><abstract>Severe combined immunodeficient mice reconstituted with human peripheral blooldlymphocytes (hu-PBL-SCID mice) were used to evaluate in vivo efficacy of a mouse IgG1 monoclonal antibody (mAb)-ricin toxin A chain immunoconjugate (H65-RTA) directed against the CD5 cell surface antigen present on human T-cells. Initial studies demonstrated that plasma levels of human soluble interleukin-2 receptor (sIL-2R) are predictive of human T-cell engraftment in spleens and blood of SCID mice transplanted with human PBL. Therefore, chimeric mice with detectable plasma levels of human sIL-2R were used in subsequent studies. Systemic injection of such mice with H65-RTA resulted in a significant depletion of human T-cells from spleens, blood and bone marrow, and a decrease in plasma levels of human sIL-2R as compared to vehicle-treated control animals. The effect of H65-RTA was dose-dependent, treatment schedule-dependent, and mAb-specific, as an isotype-, linker- and toxin-matched immunoconjugate of irrelevant binding specificity was not efficacious. Moreover, human T-cells remained depleted from SCID tissues for at least 10 days after cessation of H65-RTA treatment, indicating that the cells were killed by the immunoconjugate. 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ispartof International journal of immunopharmacology, 1993-08, Vol.15 (6), p.695-709
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subjects Animals
Antigens, CD - immunology
Biological and medical sciences
CD5 Antigens
Dose-Response Relationship, Drug
Humans
Immunoglobulins - blood
Immunomodulators
Immunotoxins - administration & dosage
Immunotoxins - pharmacology
Lymphocyte Depletion
Lymphocyte Transfusion
Medical sciences
Mice
Mice, SCID
Pharmacology. Drug treatments
Receptors, Interleukin-2 - analysis
Ricin - pharmacology
T-Lymphocytes - transplantation
Transplantation, Heterologous
title Efficacy of an anti-CD5-ricin a chain immunoconjugate in an improved human peripheral blood lymphocyte-reconstituted severe combined immunodeficient mouse model
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