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Published in: Cancer Immunology, Immunotherapy 11/2012

Open Access 01-11-2012 | Original article

Humoral anti-KLH responses in cancer patients treated with dendritic cell-based immunotherapy are dictated by different vaccination parameters

Authors: Erik H. J. G. Aarntzen, I. Jolanda M. de Vries, Joop H. Göertz, Marjo Beldhuis-Valkis, Huberdina M. L. M. Brouwers, Mandy W. M. M. van de Rakt, Renate G. van der Molen, Cornelis J. A. Punt, Gosse J. Adema, Paul J. Tacken, Irma Joosten, Joannes F. M. Jacobs

Published in: Cancer Immunology, Immunotherapy | Issue 11/2012

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Abstract

Purpose

Keyhole limpet hemocyanin (KLH) attracts biomedical interest because of its remarkable immunostimulatory properties. Currently, KLH is used as vaccine adjuvant, carrier protein for haptens and as local treatment for bladder cancer. Since a quantitative human anti-KLH assay is lacking, it has not been possible to monitor the dynamics of KLH-specific antibody (Ab) responses after in vivo KLH exposure. We designed a quantitative assay to measure KLH-specific Abs in humans and retrospectively studied the relation between vaccination parameters and the vaccine-induced anti-KLH Ab responses.

Experimental design

Anti-KLH Abs were purified from pooled serum of melanoma patients who have responded to KLH as a vaccine adjuvant. Standard isotype-specific calibration curves were generated to measure KLH-specific Ab responses in individual serum samples using ELISA.

Results

KLH-specific IgM, IgA, IgG and all IgG-subclasses were accurately measured at concentrations as low as 20 μg/ml. The intra- and inter-assay coefficients of variation of this ELISA were below 6.7 and 9.9 %, respectively. Analyses of 128 patients demonstrated that mature DC induced higher levels of KLH-specific IgG compared to immature DC, prior infusion with anti-CD25 abolished IgG and IgM production and patients with locoregional disease developed more robust IgG responses than advanced metastatic melanoma patients.

Conclusions

We present the first quantitative assay to measure KLH-specific Abs in human serum, which now enables monitoring both the dynamics and absolute concentrations of humoral immune responses in individuals exposed to KLH. This assay may provide a valuable biomarker for the immunogenicity and clinical effectiveness of KLH-containing vaccines and therapies.
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Metadata
Title
Humoral anti-KLH responses in cancer patients treated with dendritic cell-based immunotherapy are dictated by different vaccination parameters
Authors
Erik H. J. G. Aarntzen
I. Jolanda M. de Vries
Joop H. Göertz
Marjo Beldhuis-Valkis
Huberdina M. L. M. Brouwers
Mandy W. M. M. van de Rakt
Renate G. van der Molen
Cornelis J. A. Punt
Gosse J. Adema
Paul J. Tacken
Irma Joosten
Joannes F. M. Jacobs
Publication date
01-11-2012
Publisher
Springer-Verlag
Published in
Cancer Immunology, Immunotherapy / Issue 11/2012
Print ISSN: 0340-7004
Electronic ISSN: 1432-0851
DOI
https://doi.org/10.1007/s00262-012-1263-z

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