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  • Plasma peptide biomarker discovery for amyotrophic lateral sclerosis by MALDI-TOF mass spectrometry profiling.

Plasma peptide biomarker discovery for amyotrophic lateral sclerosis by MALDI-TOF mass spectrometry profiling.

PloS one (2013-11-14)
Laurence Conraux, Catherine Pech, Halim Guerraoui, Denis Loyaux, Pascual Ferrara, Jean-Claude Guillemot, Vincent Meininger, Pierre-François Pradat, François Salachas, Gaëlle Bruneteau, Nadine Le Forestier, Lucette Lacomblez
ABSTRACT

The diagnostic of Amyotrophic lateral sclerosis (ALS) remains based on clinical and neurophysiological observations. The actual delay between the onset of the symptoms and diagnosis is about 1 year, preventing early inclusion of patients into clinical trials and early care of the disease. Therefore, finding biomarkers with high sensitivity and specificity remains urgent. In our study, we looked for peptide biomarkers in plasma samples using reverse phase magnetic beads (C18 and C8) and MALDI-TOF mass spectrometry analysis. From a set of ALS patients (n=30) and healthy age-matched controls (n=30), C18- or C8-SVM-based models for ALS diagnostic were constructed on the base of the minimum of the most discriminant peaks. These two SVM-based models end up in excellent separations between the 2 groups of patients (recognition capability overall classes > 97%) and classify blinded samples (10 ALS and 10 healthy age-matched controls) with very high sensitivities and specificities (>90%). Some of these discriminant peaks have been identified by Mass Spectrometry (MS) analyses and correspond to (or are fragments of) major plasma proteins, partly linked to the blood coagulation.

MATERIALS
Product Number
Brand
Product Description

Supelco
Discovery® C8 Supelguard Guard Cartridge, 5 μm particle size, L × I.D. 2 cm × 4 mm
Supelco
Discovery® C8 HPLC Column, 5 μm particle size, L × I.D. 25 cm × 3 mm
Supelco
Discovery® C8 HPLC Column, 5 μm particle size, L × I.D. 5 cm × 4.6 mm
Supelco
Discovery® C8 HPLC Column, 5 μm particle size, L × I.D. 5 cm × 2.1 mm
Supelco
Discovery® C8 HPLC Column, 5 μm particle size, L × I.D. 15 cm × 2.1 mm
Supelco
Discovery® C8 Supelguard Guard Cartridge, 5 μm particle size, L × I.D. 2 cm × 4 mm
Supelco
Discovery® C8 HPLC Column, 5 μm particle size, L × I.D. 12.5 cm × 4 mm
Supelco
Discovery® C8 HPLC Column, 5 μm particle size, L × I.D. 12.5 cm × 4.6 mm
Supelco
Discovery® C8 Supelguard Guard Cartridge, 5 μm particle size, L × I.D. 2 cm × 2.1 mm
Supelco
Discovery® C8 HPLC Column, 5 μm particle size, L × I.D. 15 cm × 4.6 mm
Supelco
Discovery® C8 HPLC Column, 5 μm particle size, L × I.D. 25 cm × 4.6 mm