Abstract: The present invention relates to a composition for administering a double-stranded oligonucleotide structure using an ultrasonic nebulizer. According to the method, the double-stranded oligonucleotide according to the present invention forms self-assembled nanoparticles, which are 90 nm in size and have a neutral charge, and it is possible to deliver the double-stranded oligonucleotide specifically to the nasal cavity and lungs while maintaining not only the same concentration, molecular weight, purity, nanoparticle size, and osmolality as those of the stock material but also the target gene inhibitory activity without cytotoxicity. Thus, the present invention may be useful for the prevention or treatment of respiratory viral infections including COVID-19, pulmonary fibrosis caused by viral infection, or respiratory diseases.

Abstract: The present invention relates to a composition for alleviating hair graying, promoting hair growth and/or preventing or alleviating hair loss, comprising double-stranded miRNA as an active ingredient and, more specifically, to: miR-3139, miR-3189, miR-3199 or miR-8485, which are double-stranded miRNA; a double-stranded oligonucleotide structure comprising same; or a pharmaceutical or cosmetic composition for alleviating hair graying, promoting hair growth and/or preventing or alleviating hair loss, comprising nanoparticles containing the structure as an active ingredient. A composition according to the present invention can prevent hair graying and reduce the rate of progress thereof by activating melanocytes and promoting melanogenesis and can allow the hair already affected by graying to be improved to a state before graying.

Abstract: The present invention pertains to: a double-stranded oligonucleotide construct having a structure in which a hydrophilic substance and a hydrophobic substance are conjugated by a simple covalent bond or a linker-mediated covalent bond at both ends of a DKK1-specific double-stranded oligonucleotide to efficiently deliver the double-stranded oligonucleotide into cells; a nanoparticle capable of being produced through self-assembly of the double-stranded oligonucleotide construct through a hydrophobic interaction in an aqueous solution; and a hair-loss-preventing and hair-growth-promoting composition containing the double-stranded oligonucleotide construct or the nanoparticle.