Some embodiments of the invention include a nucleic acid molecule comprising natural nucleotides, non-natural nucleotides, an LNA which comprises one or more RNA core molecules, or an RNA molecule which comprises more than one RNA core molecule. Some embodiments of the invention include a nucleic acid molecule comprising an RNA molecule which comprises more than one RNA core molecule. Other embodiments of the invention include a nucleic acid molecule comprising a DNA molecule encoding the RNA molecule (e.g., vector or viral vector). Other embodiments include compositions or pharmaceutical compositions that comprise the nucleic acid molecule. Some embodiments of the invention comprise reducing miR-143 in a cell. Other embodiments of the invention include methods to deliver a protein across the BBB. Other embodiments include methods for treating disease (e.g., LSD, neuronopathic disease, neurodegenerative disease, Hurler syndrome, or MPS I). Additional embodiments of the invention are also discussed herein.
