Nucleic Acids Research, 1994, Vol. 22, No. 22 4681-4688
© 1994
CHEMISTRY |
Imporved biological activity of antisense oligonucleotides conjugated to a fusogenic peptide
Institut de Génétique Moléculaire de Montpellier–UMR CNRS 9942 1919 route de Mende, 34033 Montpellier 1 U 74 INSERM, Faulté de Médecine, Laboratoire de Virologie, Université Louis Pasteur 3rue de Koeberlé, 67000 Strasbourg, France
*To whom correspondence should be addressed
Received July 8, 1994. Revised October 6, 1994. Accepted October 14, 1994.
Recently several groups reported a dramatic improvement of reporter gene transfection efficiency using a fusogenic peptide, derived from the Influenza hemagglutinin envelop protein. This peptide changes conformation at acidic pH and destabilizes the endosomal membranes thus resulting in an increased cytoplasmic gene delivery. We describe the use of a similar fusogenic peptide in order to improve the antiviral potency of antisense oligodeoxynucleotides (anti TAT) and oligophosphorothioates (S-dC28) on de novo HIV infected CEM-SS lymphocytes in serum-free medium. We observed a 5 to 10 fold improvement of the anti HIV activities of the phosphodiester antisense oligonucleotides after chemical coupling to the peptide in a one to one ratio by a disulfide or thioether bond. No toxicities were observed at the effective doses (0.1-1 µM). No sequence specificity was obtained and the fusogenic peptide possessed some antiviral activities on its own (IC50: 6 µM). A S-dC28 – peptide disulfide linked conjugate and a streptavidin - peptidebiotinylated S-dC28 adduct showed similar activities as the free S-dC28 oligonucleotide (IC50: 0.1–1 nM). As expected, all the compounds were less potent in the presence of serum but the relative contribution of peptide coupling was maintained.
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