Searching for markers of Creutzfeldt-Jakob disease in cerebrospinal fluid by two-dimensional mapping

Proteomics
Chiara PiubelliPier Giorgio Righetti

Abstract

Differential proteomic analysis has been performed on the cerebrospinal fluid (CSF) of six healthy and six patients suffering form sporadic Creutzfeldt-Jakob disease (sCJD), age- and sex-matched, after immuno-subtraction of albumin and immunoglobulins. These maps have revealed 28 polypeptide chains differentially modulated in the sCJD samples, of which 10 appeared to be up-regulated, the remaining 18 being down-regulated. Among those, 13 could be identified upon digestion and MALDI-TOF, MS analysis. In addition, the strong modulation of cystatin C was also confirmed by immunoblot analysis and the highly altered level of the 14-3-3 proteins that escaped detection by 2-D mapping, could be assessed by Western blots and immuno-detection of monomeric and homo- and hetero-dimeric 14-3-3 isotypes. In search for a panel of potential markers for sCJD, we highlight cystatin C, 14-3-3 proteins, transferrin, ubiquitin, Apoliprotein J and perhaps some of the still unidentified, but strongly modulated polypeptide chains detected in the differential map.

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