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Detection of JC virus DNA in cerebrospinal fluid from multiple sclerosis patients

Laboratory of Biology, Don C. Gnocchi Foundation, IRCCS (Research Hospital), Milan, Italy, Institute of Medical Microbiology, University of Milan, IRCCS, Milan, Italy

E Omodeo-Zorini

Laboratory of Biology, Don C. Gnocchi Foundation, IRCCS (Research Hospital), Milan, Italy

R Caldarelli-Stefano

Laboratory of Biology, Don C. Gnocchi Foundation, IRCCS (Research Hospital), Milan, Italy

M Mediati

Laboratory of Biology, Don C. Gnocchi Foundation, IRCCS (Research Hospital), Milan, Italy

E Fainardi

Neurological Clinic, University of Ferrara, IRCCS, Milan, Italy

E Granieri

Neurological Clinic, University of Ferrara, IRCCS, Milan, Italy

D Caputo

Multiple Sclerosis Unit, Don C. Gnocchi Foundation, IRCCS, Milan, Italy

JC virus (JCV), the causative agent of progressive multifocal leukoencephalopathy (PML), has been proposed as a possible aetiopathogenic factor in multiple sclerosis (MS). We performed a study to search the LT region of JCV genome by nested PCR in cerebrospinal fluid (CSF), peripheral blood mononuclear cell (PBMC) and urine samples collected from 121 MS patients, 24 patients with other neurological disorders (OND), 30 non neurological patients (NND) and in PBMCs and urine of 40 healthy subjects. JCV DNA has been found in the CSF of 11 MS patients (9%) while all the CSFs from the 24 OND and the 30 NND cases were negative. No significant differences have been observed as regard to the frequency of JCV DNA detection in PBMCs and urine between the MS patients and the control groups. Nucleotide sequences analysis of seven JCV CSF isolates showed that five strains were identical the prototypal strain, while the other two had a base mutation (TC) in 4286 nucleotide (nt). The finding of JCV DNA in the CSF of MS patients suggest that JCV could play a role in the triggering and/or in the maintenance of MS aetiopathogenic process, and therefore it should be taken in consideration when monitoring this disease.

Key Words: JC virus • multiple sclerosis • cerebrospinal fluid • peripheral blood • urine • polymerase chain reaction

Multiple Sclerosis, Vol. 4, No. 2, 49-54 (1998)
DOI: 10.1177/135245859800400202


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