Jeffery D Haines1, Oscar G Vidaurre1, Fan Zhang1, Ángela L Riffo-Campos2, Josefa Castillo2, Bonaventura Casanova3, Patrizia Casaccia4, Gerardo Lopez-Rodas5. 1. Department of Neuroscience, Genetics and Genomics, Icahn School of Medicine at Mount Sinai, New York, USA. 2. Department of Biochemistry and Molecular Biology, University of Valencia, and Institute of Health Research INCLIVA, Valencia, Spain. 3. Department of Neurology, Hospital Universitari La Fe, Valencia, Spain. 4. Department of Neuroscience, Genetics and Genomics, Icahn School of Medicine at Mount Sinai, New York, USA patrizia.casaccia@mssm.edu. 5. Department of Biochemistry and Molecular Biology, University of Valencia, 46100 Burjassot, Valencia, Spain.
Abstract
BACKGROUND: Cerebrospinal fluid (CSF) is in contact with brain parenchyma and ventricles, and its composition might influence the cellular physiology of oligodendrocyte progenitor cells (OPCs) thereby contributing to multiple sclerosis (MS) disease pathogenesis. OBJECTIVE: To identify the transcriptional changes that distinguish the transcriptional response induced in proliferating rat OPCs upon exposure to CSF from primary progressive multiple sclerosis (PPMS) or relapsing remitting multiple sclerosis (RRMS) patients and other neurological controls. METHODS: We performed gene microarray analysis of OPCs exposed to CSF from neurological controls, or definitive RRMS or PPMS disease course. Results were confirmed by quantitative reverse transcriptase polymerase chain reaction, immunocytochemistry and western blot of cultured cells, and validated in human brain specimens. RESULTS: We identified common and unique oligodendrocyte genes for each treatment group. Exposure to CSF from PPMS uniquely induced branching of cultured progenitors and related transcriptional changes, including upregulation (P<0.05) of the adhesion molecule GALECTIN-3/Lgals3, which was also detected at the protein level in brain specimens from PPMS patients. This pattern of gene expression was distinct from the transcriptional programme of oligodendrocyte differentiation during development. CONCLUSIONS: Despite evidence of morphological differentiation induced by exposure to CSF of PPMS patients, the overall transcriptional response elicited in cultured OPCs was consistent with the activation of an aberrant transcriptional programme.
BACKGROUND: Cerebrospinal fluid (CSF) is in contact with brain parenchyma and ventricles, and its composition might influence the cellular physiology of oligodendrocyte progenitor cells (OPCs) thereby contributing to multiple sclerosis (MS) disease pathogenesis. OBJECTIVE: To identify the transcriptional changes that distinguish the transcriptional response induced in proliferating rat OPCs upon exposure to CSF from primary progressive multiple sclerosis (PPMS) or relapsing remitting multiple sclerosis (RRMS) patients and other neurological controls. METHODS: We performed gene microarray analysis of OPCs exposed to CSF from neurological controls, or definitive RRMS or PPMS disease course. Results were confirmed by quantitative reverse transcriptase polymerase chain reaction, immunocytochemistry and western blot of cultured cells, and validated in human brain specimens. RESULTS: We identified common and unique oligodendrocyte genes for each treatment group. Exposure to CSF from PPMS uniquely induced branching of cultured progenitors and related transcriptional changes, including upregulation (P<0.05) of the adhesion molecule GALECTIN-3/Lgals3, which was also detected at the protein level in brain specimens from PPMS patients. This pattern of gene expression was distinct from the transcriptional programme of oligodendrocyte differentiation during development. CONCLUSIONS: Despite evidence of morphological differentiation induced by exposure to CSF of PPMS patients, the overall transcriptional response elicited in cultured OPCs was consistent with the activation of an aberrant transcriptional programme.
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