Different behaviour of mouse‐human chimeric antibody F(ab') 2 fragments of IgG 1 , IgG 2 and IgG 4 sub‐class in vivo

Mouse‐human chimeric monoclonal antibodies (MAbs) of 3 different human IgG sub‐classes directed against carcinoembryonic antigen (CEA) have been produced in SP‐0 cells trans‐ fected with genomic chimeric DNA. F(ab') 2 fragments were obtained by pepsin digestion of the purified chimeric MAbs of...

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Veröffentlicht in:International journal of cancer 1992-02, Vol.50 (3), p.416-422
Hauptverfasser: Buchegger, Franz, Pèlegrin, Andre, Hardman, Norman, Heusser, Christoph, Lukas, John, Dolci, Wanda, Mach, Jean‐Pierre
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container_end_page 422
container_issue 3
container_start_page 416
container_title International journal of cancer
container_volume 50
creator Buchegger, Franz
Pèlegrin, Andre
Hardman, Norman
Heusser, Christoph
Lukas, John
Dolci, Wanda
Mach, Jean‐Pierre
description Mouse‐human chimeric monoclonal antibodies (MAbs) of 3 different human IgG sub‐classes directed against carcinoembryonic antigen (CEA) have been produced in SP‐0 cells trans‐ fected with genomic chimeric DNA. F(ab') 2 fragments were obtained by pepsin digestion of the purified chimeric MAbs of human IgG 1 , IgG 2 and IgG 4 sub‐class and of parental mouse MAb IgG. The 4 F(ab') 2 fragments exhibit similar molecular weight by SDS‐PAGE. They were labelled with 125 I or 131 I and high binding (80 to 87%) to purified unsolubilized CEA was observed. In vivo , double labelling experiments indicate that the longest biological half‐life and the highest tumour‐localization capacity is obtained with F(ab') 2 from chimeric MAb of human IgG 2 sub‐class, whereas F(ab') 2 from chimeric MAb IgG 4 give very low values for these 2 parameters. F(ab') 2 from chimeric MAb IgG 1 and from parental mouse MAb yield intermediate results in vivo. Our findings should help to select the appropriate human IgG sub‐class to produce chimeric or reshaped MAb F(ab') 2 to be used for tumour detection by immunoscintigraphy and for radioimmunotherapy.
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title Different behaviour of mouse‐human chimeric antibody F(ab') 2 fragments of IgG 1 , IgG 2 and IgG 4 sub‐class in vivo
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