Targeting Cytomegalovirus-Infected Cells Using T Cells Armed with Anti-CD3 × Anti- CMV Bispecific Antibody  Lawrence G. Lum, Mayur Ramesh, Archana Thakur,

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Targeting Cytomegalovirus-Infected Cells Using T Cells Armed with Anti-CD3 × Anti- CMV Bispecific Antibody  Lawrence G. Lum, Mayur Ramesh, Archana Thakur, Subhashis Mitra, Abhinav Deol, Joseph P. Uberti, Philip E. Pellett  Biology of Blood and Marrow Transplantation  Volume 18, Issue 7, Pages 1012-1022 (July 2012) DOI: 10.1016/j.bbmt.2012.01.022 Copyright © 2012 American Society for Blood and Marrow Transplantation Terms and Conditions

Figure 1 (A) Production of CMVBi.OKT3 was cross-linked with Traut’s reagent, and Cytogam® was cross-linked with SMCC before mixing followed by overnight heterconjugation. The reactants were resolved by nonreducing PAGE gel and stained with Coomassie blue. All lanes were loaded with 8 μg of protein. Lane 1: OKT3; lane 2: Cytogam; lane 3: CMVBi. (B) Staining of CMV-infected cells.The series of panels show dual staining for infected fibroblasts by staining for IE-2 (FITC, green) expressed in the nucleus, cytoplasm, and cell surface viral proteins by staining with CMVBi (PE, red). Nuclei of infected and noninfected cells were counterstained with blue DAPI (blue, lower left panel). The rightlower panel shows merged images for anti-IE2 and anti-CMVBi staining at 20× magnification. Biology of Blood and Marrow Transplantation 2012 18, 1012-1022DOI: (10.1016/j.bbmt.2012.01.022) Copyright © 2012 American Society for Blood and Marrow Transplantation Terms and Conditions

Figure 2 Cytotoxicity directed at CMV-infected MRC-5 fibroblasts as a function of the CMVBi arming dose. Cytotoxicity mediated by ATCs armed with increasing doses of CMVBi directed at MRC-5 human lung fibroblasts infected with CMV strain AD169. ATCs were armed with 0.01, 0.1, 1, 5, 50, 100, and 200 ng per 106 ATCs and tested for specific cytotoxicity against CMV-infected cells with an MOI of 0.1 after 96 hours of infection. Unarmed ATCs from the same normal donor are shown. The data represent the mean cytotoxicity ± standard error of the mean (SEM) of triplicate determinations. Biology of Blood and Marrow Transplantation 2012 18, 1012-1022DOI: (10.1016/j.bbmt.2012.01.022) Copyright © 2012 American Society for Blood and Marrow Transplantation Terms and Conditions

Figure 3 Cytotoxicity as a function of time of CMV infection. CMVBi-armed ATCs and unarmed ATCs from one donor were tested against MRC-5 targets at E:T from 3.12 to 25:1 at 48, 72, and 96 hours after infection at an MOI of 0.1. The data are presented as mean ± SEM of triplicate determinations. Biology of Blood and Marrow Transplantation 2012 18, 1012-1022DOI: (10.1016/j.bbmt.2012.01.022) Copyright © 2012 American Society for Blood and Marrow Transplantation Terms and Conditions

Figure 4 CMVBi-armed ATCs targeting of CMV-infected and uninfected fibroblast as a function MOI. MRC-5 human lung fibroblasts were plated after infected for 96 hours (I) at the MOIs of 0.01, 0.05, 0.1 and 1.0 or left uninfected as controls (UnI) as indicated in each panel. ATC-I (ATCs + infected targets), armed ATC-I (CMVBi-armed ATCs + infected targets); ATC-UnI (ATCs + unInfected targets); and armed ATC-UnI (CMVBi-armed ATCs + uninfected targets). Biology of Blood and Marrow Transplantation 2012 18, 1012-1022DOI: (10.1016/j.bbmt.2012.01.022) Copyright © 2012 American Society for Blood and Marrow Transplantation Terms and Conditions

Figure 5 (A) Specific cytotoxicity directed at CMV-infected fibroblasts at various E:T ratios. CMVBi-armed ATCs (aATC) and unarmed ATCs (ATC) from 4 donors were tested for cytotoxicity-directed MRC-5 targets at an MOI of 0.1 at E:T from 25:1 to 0.125:1 in 51Cr release cytotoxicity. The data are presented as the mean ± SEM of 4 donors. (B) Comparison of cytotoxicity seen in ADCC, CDC, and CMVBi with ATCs and armed ATCs. PBMC or ATCs from 2 normal subjects were used for this experiment. Antibody-dependent cellular cytotoxicity was tested using CMVBi at 50 ng/mL (CMVBi-ADCC) and Cytogam® 10 μg/mL (Cytogam®-ADCC) in the presence of fresh PBMC at the indicated E:T, ATCs armed with 50 ng/106 ATCs (CMVBi-armed ATCs) or unarmed ATCs (ATC) were tested for cytotoxicity at the indicated E:T. Complement-dependent cytotoxicity (CDC) was tested using fresh human complement (1:10 dilutions of fresh human serum) either in the presence of CMVBi at 50 ng/mL or Cytogam® 10 μg/mL on MRC-5 targets. The experiments were conducted at an MOI of 1. (C) The effects of irradiation on cytotoxicity mediated by CMVBi-armed ATCs. Unarmed ATCs (ATC), CMVBi-armed ATCs (aATC) from 2 donors were tested against irradiated ATCs (ATC∗) and irradiated CMVBi-armed ATCs (aATC∗ for specific cytotoxicity directed at CMV-infected fibroblasts) (0.1 MOI after 96 hours of infection) at E:T from 3.12 to 25:1. The data are presented as mean ± SEM of triplicate determinations. Biology of Blood and Marrow Transplantation 2012 18, 1012-1022DOI: (10.1016/j.bbmt.2012.01.022) Copyright © 2012 American Society for Blood and Marrow Transplantation Terms and Conditions

Figure 6 Marked depressed allogeneic responses from ATCs and armed ATCs. Six experiments involving cocultures of unrelated allogeneic responder PBMC (Pr) and irradiated PBMC stimulator cells (P∗s) in the allogeneic MLR control. Pr and autologous irradiated PBMC (P∗r) from the same individual cocultured in an autologous MLR; ATCs from the responder (ATCr) cocultured with autologous P∗r in an autologous MLR (control); ATCr cocultured with P∗s in allogeneic MLR to assess allo-reactivity of ATC; responder armed ATCs (aATCr) cocultured with autologous P∗r in an autologous MLR (control); and aATCr cocultured with P∗s in allogeneic MLR to assess allo-reactivity of aATC. Biology of Blood and Marrow Transplantation 2012 18, 1012-1022DOI: (10.1016/j.bbmt.2012.01.022) Copyright © 2012 American Society for Blood and Marrow Transplantation Terms and Conditions