Mechanisms of a phosphorothioate oligonucleotide delivery by skin electroporation.
Skin electroporation has great potential for topical delivery of oligonucleotides. Controled therapeutic levels of an intact phosphorothioate oligonucleotide (PS) can be reached in the viable tissue of the skin. The aim of this work was to investigate the transport mechanisms of a PS in hairless rat skin by electroporation, and hence to allow optimization of oligonucleotides (ONs) topical delivery. The pulsing condition used was five exponentially-decaying pulses of 100 V and 500 ms pulse time. The main mechanism of PS transport in the skin viable tissues during pulsing was electrophoresis. The electroosmosis contribution was negligible. Electrophoresis created within minutes a reservoir of PS in the skin viable tissues, which persisted within a therapeutic range of hours. A strong PS/stratum corneum interaction occurred.
Regnier
V
V
Université Catholique de Louvain, Unité de Pharmacie Galénique, Avenue E. Mounier, 73, UCL 73.20, 1200 Brussels, Belgium.
De Morre
N
N
Jadoul
A
A
Préat
V
V
D000818:Animals; D001693:Biological Transport, Active; D004558:Electric Stimulation; D018274:Electroporation; D066298:In Vitro Techniques; D007478:Iontophoresis; D008297:Male; D009841:Oligonucleotides / Q000008:administration & dosage*; D051381:Rats; D011923:Rats, Nude; D012869:Skin Absorption
D009841:Oligonucleotides