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Updated: Aug 17, 2026

In Vivo SiRNA Transfection and Gene Knockdown in Spinal Cord via Rapid Noninvasive Lumbar Intrathecal Injections in Mice
Published on: March 22, 2014
A Gi2alpha antisense oligonucleotide differentiates morphine antinociception, constipation and acute dependence in
R B Raffa1, T L Goode, R P Martinez
1Drug Discovery Research, The R.W. Johnson Pharmaceutical Research Institute, Spring House, PA, USA.
Abstract:
In the same mice in which the intracerebroventricular (i.c.v.) administration of antisense oligodeoxyribonucleotide (oligo) directed against the Gi2alpha (but not Gi1alpha, Gi3alpha or G(s)alpha) G-protein subunits attenuated i.c.v. morphine-induced antinociception in the tail-flick test, none of the oligos altered naloxone-precipitated jumping (acute dependence). Likewise, none of the oligos significantly altered morphine-induced constipation. Hence, i.c.v. morphine-induced antinociception might be preferentially mediated via transduction pathway(s) different from constipation or acute dependence, offering novel opportunities for drug discovery.
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