In Vivo Hypotensive Effect of Aminosilanol-Based Nanocomposites Bearing Antisense Oligonucleotides

The search for new effective drugs for the treatment of arterial hypertension continues to be an urgent task. We studied the effect of aminosilanol nanocomposites (Si-ODN) that contained antisense oligonucleotides on the blood pressure in the hypertensive ISIAH rat strain, an experimental model of stress-sensitive arterial hyper-tension. The intraperitoneal, intravenous, and inhalation administration of Si-ODN targeted to mRNAs of the AT1A, ADRB1, and ACE1 genes decreased systolic blood pressure by 12-40 mm Hg. The use of scrambled oli-gonucleotides led to no antisense effect. The proposed in vivo delivery system was shown to be suitable for ol-igonucleotides with both natural and modified internucleotide bonds. The Si-ODN nanocomposites demonstrated the absence of toxicity under the studied conditions. The intravenous administration of a fluo-rescently labeled nanocomposite led to its accumulation in the animal's liver and kidneys, and when inhaled, a certain amount was detected in the brain. The content of the label reaches a maximum one day after the treatment and is almost eliminated from the body in two weeks. The best way to correct hypertension in ISIAH rats using the studied nanocomposites may be periodic inhalation of the nanocomposite that carries an oligo-nucleotide targeted to ACE1-mRNA.