Transcriptome Profiling of miRNA-mRNA Interactions and Associated Mechanisms in Chemotherapy-Induced Neuropathic Pain

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Chemotherapy-induced neuropathic pain (CINP) is a significant dose-limiting side effect impacting 40% of patients.
• The precise molecular mechanisms, particularly miRNA-mRNA interactions, underlying CINP are not fully understood.

Purpose of the Study:

• To comprehensively profile miRNA-mRNA interactions in the spinal dorsal horn of a rat model with CINP.
• To identify key molecular players and pathways involved in CINP pathogenesis.
• To explore potential therapeutic targets for managing CINP.

Main Methods:

• Establishment of a paclitaxel-induced rat model of CINP.
• Nociceptive behavioral testing (mechanical allodynia, thermal hyperalgesia, cold allodynia).
• mRNA transcriptomics and small RNA sequencing of the spinal dorsal horn.
• Bioinformatic analyses including GSEA, GO, KEGG, PPI, and network analyses.
• Validation using RT-qPCR, dual-luciferase assays, and single-cell analysis.

Main Results:

• Identification of 86 differentially expressed mRNAs and 56 miRNAs in the CINP model.
• Enrichment analyses revealed involvement of pathways such as Odorant binding, synaptic specialization, extracellular matrix, and retrograde endocannabinoid signaling.
• Increased Th17 and decreased MDSC immune cell infiltration observed in CINP.
• The gene Mpz, expressed in Schwann cells, was identified as critical in maintaining CINP under miRNA regulation.

Conclusions:

• This study elucidates the miRNA-mRNA interaction landscape in the spinal dorsal horn under CINP conditions.
• Mpz plays a crucial role in CINP pathogenesis and may serve as a promising therapeutic target.
• Understanding these molecular interactions provides insights into novel strategies for CINP management.