Identification of the miRNA-mRNA regulatory network in multiple sclerosis

Area of Science:

• Neuroscience
• Genetics
• Molecular Biology

Background:

• Multiple sclerosis (MS) is a prevalent neurological disorder affecting young adults, characterized by damage to the central nervous system's myelin or oligodendrocytes, leading to disability.
• Understanding the molecular mechanisms underlying MS is crucial for developing effective diagnostic and therapeutic strategies.

Purpose of the Study:

• To identify key microRNAs (miRNAs) in the blood of multiple sclerosis patients.
• To elucidate the underlying molecular mechanisms and potential biomarkers involved in MS pathophysiology.

Main Methods:

• Integrated analysis of publicly available Gene Expression Omnibus datasets for MS.
• Microarray analysis of miRNA and mRNA expression in blood samples from MS patients and healthy controls.
• Gene Ontology and Kyoto Encyclopedia of Genes and Genomes pathway analyses, miRNA-mRNA interaction network construction, and quantitative real-time polymerase chain reaction (qRT-PCR) for validation.

Main Results:

• Identification of 45 significantly dysregulated miRNAs and 621 dysregulated mRNAs in MS patients.
• Prediction of 1165 miRNA-mRNA negative correlation pairs, with hsa-miR-30a, hsa-miR-93, hsa-miR-20b, and hsa-miR-20a identified as central regulatory hubs.
• Dysregulated mRNAs were significantly enriched in pathways related to ribosome, tuberculosis, and cancer. qRT-PCR confirmed the upregulation of hsa-miR-328-3p and downregulation of its target RAC2, and upregulation of hsa-miR-20a-5p with downregulation of EIF4EBP2 in MS patients.

Conclusions:

• hsa-miR-30a, hsa-miR-93, hsa-miR-20b, and hsa-miR-20a are likely key players in the pathophysiology of MS.
• These miRNAs may be involved in critical signaling pathways, including those related to ribosome, tuberculosis, and cancer, offering potential therapeutic targets.