Targeting membrane heat-shock protein 70 (Hsp70) on tumors by cmHsp70.1 antibody

Immunization of mice with a 14-mer peptide TKDNNLLGRFELSG, termed "TKD," comprising amino acids 450–461 (aa 450–461 ) in the C terminus of inducible Hsp70, resulted in the generation of an IgG1 mouse mAb cmHsp70.1. The epitope recognized by cmHsp70.1 mAb, which has been confirmed to be loc...

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Veröffentlicht in:Proceedings of the National Academy of Sciences - PNAS 2011-01, Vol.108 (2), p.733-738
Hauptverfasser: Stangl, Stefan, Gehrmann, Mathias, Riegger, Julia, Kuhs, Kristin, Riederer, Isabelle, Sievert, Wolfgang, Hube, Kathrin, Mocikat, Ralph, Dressel, Ralf, Kremmer, Elisabeth, Pockley, Alan G., Friedrich, Lars, Vigh, Laszlo, Skerra, Arne, Multhoff, Gabriele, Kondorosi, Eva
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container_title Proceedings of the National Academy of Sciences - PNAS
container_volume 108
creator Stangl, Stefan
Gehrmann, Mathias
Riegger, Julia
Kuhs, Kristin
Riederer, Isabelle
Sievert, Wolfgang
Hube, Kathrin
Mocikat, Ralph
Dressel, Ralf
Kremmer, Elisabeth
Pockley, Alan G.
Friedrich, Lars
Vigh, Laszlo
Skerra, Arne
Multhoff, Gabriele
Kondorosi, Eva
description Immunization of mice with a 14-mer peptide TKDNNLLGRFELSG, termed "TKD," comprising amino acids 450–461 (aa 450–461 ) in the C terminus of inducible Hsp70, resulted in the generation of an IgG1 mouse mAb cmHsp70.1. The epitope recognized by cmHsp70.1 mAb, which has been confirmed to be located in the TKD sequence by SPOT analysis, is frequently detectable on the cell surface of human and mouse tumors, but not on isogenic cells and normal tissues, and membrane Hsp70 might thus serve as a tumor-specific target structure. As shown for human tumors, Hsp70 is associated with cholesterol-rich microdomains in the plasma membrane of mouse tumors. Herein, we show that the cmHsp70.1 mAb can selectively induce antibody-dependent cellular cytotoxicity (ADCC) of membrane Hsp70⁺ mouse tumor cells by unstimulated mouse spleen cells. Tumor killing could be further enhanced by activating the effector cells with TKD and IL-2. Three consecutive injections of the cmHsp70.1 mAb into mice bearing CT26 tumors significantly inhibited tumor growth and enhanced the overall survival. These effects were associated with infiltrations of NK cells, macrophages, and granulocytes. The Hsp70 specificity of the ADCC response was confirmed by preventing the antitumor response in tumor-bearing mice by coinjecting the cognate TKD peptide with the cmHsp70.1 mAb, and by blocking the binding of cmHsp70.1 mAb to CT26 tumor cells using either TKD peptide or the C-terminal substrate-binding domain of Hsp70.
doi_str_mv 10.1073/pnas.1016065108
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subjects Amino acids
Animals
Antibodies
Antibodies, Monoclonal - chemistry
Antibody dependent cell cytotoxicity
Binding sites
Biochemistry
Biological Sciences
Cell Line, Tumor
Cell lines
Cell membranes
Cholesterol - chemistry
Cytotoxicity
Granulocytes - cytology
Heat shock proteins
HSP70 Heat-Shock Proteins - chemistry
Human subjects
Humans
Immunization
Interleukin-2 - metabolism
Killer Cells, Natural - cytology
Macrophages - cytology
Macrophages - metabolism
Membranes
Mice
Mice, Inbred BALB C
Mice, Inbred C57BL
Natural killer cells
Neoplasm Transplantation
Peptides
Protein Binding
Protein Structure, Tertiary
Rodents
Spleen cells
T lymphocytes
Tumor cell line
Tumors
title Targeting membrane heat-shock protein 70 (Hsp70) on tumors by cmHsp70.1 antibody
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