We assessed the autoantibody repertoire of a mouse model engineered to develop breast cancer and the repertoire of autoantibodies in plasmas collected at a pre-clinical time point and at the time of clinical diagnosis of breast cancer. In seeking to identify common pathways, networks and protein families associated with the humoral response, we elucidated the dynamic nature of tumor antigens and autoantibody interactions. Lysate proteins from an immortalized cell line from an MMTV-neu mouse model and from MCF7 human breast cancers were spotted onto nitrocellulose microarrays and hybridized with mouse and human plasma samples, respectively. Ig-based plasma immunoreactivity against glycolysis and spliceosome proteins was a predominant feature observed both in tumor bearing mice and in pre-diagnostic human samples. Interestingly, autoantibody reactivity was more pronounced further away than closer to diagnosis. We provide evidence for dynamic changes in autoantibody reactivity with tumor development and progression that may depend in part on the extent of antigen-antibody interactions.
Autoantibody signatures involving glycolysis and splicesome proteins precede a diagnosis of breast cancer among post-menopausal women
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