Pharmacoproteomic study of the effects of chondroitin and glucosamine sulfate on human articular chondrocytes.

Arthritis Research & Therapy
Valentina CalamiaFrancisco J Blanco

Abstract

Chondroitin sulfate (CS) and glucosamine sulfate (GS) are symptomatic slow-acting drugs for osteoarthritis (OA) widely used in clinic. Despite their widespread use, knowledge of the specific molecular mechanisms of their action is limited. The aim of this work is to explore the utility of a pharmacoproteomic approach for the identification of specific molecules involved in the pharmacological effect of GS and CS. Chondrocytes obtained from three healthy donors were treated with GS 10 mM and/or CS 200 μg/mL, and then stimulated with interleukin-1β (IL-1β) 10 ng/mL. Whole cell proteins were isolated 24 hours later and resolved by two-dimensional electrophoresis. The gels were stained with SYPRORuby. Modulated proteins were identified by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF/TOF) mass spectrometry. Real-time PCR and Western blot analyses were performed to validate our results. A total of 31 different proteins were altered by GS or/and CS treatment when compared to control. Regarding their predicted biological function, 35% of the proteins modulated by GS are involved in signal transduction pathways, 15% in redox and stress response, and 25% in protein synthesis and folding processes. Interestingly, ...Continue Reading

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Citations

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Methods Mentioned

BETA
electrophoresis
FCS
PCR
glycosylation

Software Mentioned

ImageScanner
LightCycler 480
Prot
Mascot
Roche
Universal Probe Library
PDQuest
PSORT
Data Explorer
ImageQuant

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