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Published on: July 23, 2012
The microRNA let-7b-5p Is Negatively Associated with Inflammation and Disease Severity in Multiple Sclerosis
Georgia Mandolesi1,2, Francesca Romana Rizzo3, Sara Balletta3
1Synaptic Immunopathology Lab, IRCCS San Raffaele Pisana, 00166 Rome, Italy.
Abstract:
The identification of microRNAs in biological fluids for diagnosis and prognosis is receiving great attention in the field of multiple sclerosis (MS) research but it is still in its infancy. In the present study, we observed in a large sample of MS patients that let-7b-5p levels in the cerebrospinal fluid (CSF) were highly correlated with a number of microRNAs implicated in MS, as well as with a variety of inflammation-related protein factors, showing specific expression patterns coherent with let-7b-5p-mediated regulation. Additionally, we found that the CSF let-7b-5p levels were significantly reduced in patients with the progressive MS compared to patients with relapsing-remitting MS and were negatively correlated with characteristic hallmark processes of the two phases of the disease. Indeed, in the non-progressive phase, let-7b-5p inversely associated with both central and peripheral inflammation; whereas, in progressive MS, the CSF levels of let-7b-5p negatively correlated with clinical disability at disease onset and after a follow-up period. Overall, our results uncovered, by the means of a multidisciplinary approach and multiple statistical analyses, a new possible pleiotropic action of let-7b-5p in MS, with potential utility as a biomarker of MS course.
Insights
let-7b-5p levels in cerebrospinal fluid (CSF) correlate with multiple sclerosis (MS) biomarkers and inflammation. Reduced CSF let-7b-5p indicates progressive MS and links to disease severity, suggesting its potential as an MS biomarker.
Area of Science:
- Neuroscience
- Biochemistry
- Genetics
Background:
- MicroRNAs (miRNAs) in biological fluids are emerging biomarkers for multiple sclerosis (MS) diagnosis and prognosis.
- Current research on miRNA biomarkers for MS is still in its early stages.
Purpose of the Study:
- To investigate the role of let-7b-5p in the cerebrospinal fluid (CSF) of multiple sclerosis patients.
- To explore the correlation of CSF let-7b-5p levels with MS disease course and inflammatory markers.
Main Methods:
- Analysis of CSF samples from a large cohort of MS patients.
- Correlation studies between let-7b-5p levels, other MS-implicated microRNAs, and inflammation-related proteins.
- Statistical analysis to assess the relationship between CSF let-7b-5p and disease progression, inflammation, and clinical disability.
Main Results:
- CSF let-7b-5p levels showed significant correlations with other MS-related microRNAs and inflammation markers.
- Reduced CSF let-7b-5p levels were observed in progressive MS patients compared to relapsing-remitting MS patients.
- CSF let-7b-5p inversely correlated with inflammation in the non-progressive phase and with clinical disability in progressive MS.
Conclusions:
- let-7b-5p exhibits a pleiotropic role in multiple sclerosis pathogenesis.
- CSF let-7b-5p may serve as a potential biomarker for monitoring MS disease course and progression.
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