Characterization of the MicroRNA Profile of Ginger Exosome-like Nanoparticles and Their Anti-Inflammatory Effects in Intestinal Caco-2 Cells

Plant-derived exosome-like nanoparticles (PELNs) have been shown to enter mammalian cells for disease treatment. Although abundant miRNAs are contained in ginger exosome-like nanoparticles (GELNs), little is known about their type and function. Herein, we extracted GELNs with desirable particle sizes (156 ± 36 nm) and a negative surface charge (-26.6 ± 5 mV). The miRNA profiles in ginger and GELNs were analyzed using high-throughput sequencing, and the results of the sequencing were validated by real-time quantitative polymerase chain reaction (RT-qPCR). There were 27 miRNAs with higher expression levels in the GELNs, and they were mainly involved in the regulation of inflammatory and cancer-related pathways. Furthermore, GELNs could be specifically internalized by intestine cells via caveolin-mediated endocytosis and micropinocytosis, as well as counteract lipopolysaccharide (LPS)-induced inflammation by downregulating NF-κβ, IL-6, IL-8, and TNF-α expression. Importantly, the positive effects were further proved to be possibly related to the miRNAs enriched in the GELNs. Overall, these results indicated that PELNs could target human digestive organs and play a cross-kingdom physiological regulation role through miRNAs.