title: Discovery and early development of AVI-7537 and AVI-7288 for the treatment of Ebola virus and Marburg virus infections.
abstract: There are no currently approved treatments for filovirus infections. In this study we report the discovery process which led to the development of antisense Phosphorodiamidate Morpholino Oligomers (PMOs) AVI-6002 (composed of  AVI-7357 and AVI-7539) and AVI-6003 (composed of AVI-7287 and AVI-7288) targeting Ebola virus and Marburg virus respectively. The discovery process involved identification of optimal transcript binding sites for PMO based RNA-therapeutics followed by screening for effective viral gene target in mouse and guinea pig models utilizing adapted viral isolates. An evolution of chemical modifications were tested, beginning with simple Phosphorodiamidate Morpholino Oligomers (PMO) transitioning to cell penetrating peptide conjugated PMOs (PPMO) and ending with PMOplus containing a limited number of positively charged linkages in the PMO structure. The initial lead compounds were combinations of two agents targeting separate genes. In the final analysis, a single agent for treatment of each virus was selected, AVI-7537 targeting the VP24 gene of Ebola virus and AVI-7288 targeting NP of Marburg virus, and are now progressing into late stage clinical development as the optimal therapeutic candidates.
authors.affiliation: Sarepta Therapeutics, Bothell, Washington 98021, USA. piversen@sareptatherapeutics.com
authors.forename: Patrick L
authors.initials: PL
authors.lastname: Iversen
authors.forename: Travis K
authors.initials: TK
authors.lastname: Warren
authors.forename: Jay B
authors.initials: JB
authors.lastname: Wells
authors.forename: Nicole L
authors.initials: NL
authors.lastname: Garza
authors.forename: Dan V
authors.initials: DV
authors.lastname: Mourich
authors.forename: Lisa S
authors.initials: LS
authors.lastname: Welch
authors.forename: Rekha G
authors.initials: RG
authors.lastname: Panchal
authors.forename: Sina
authors.initials: S
authors.lastname: Bavari
mesh_terms: D000818:Animals; D000998:Antiviral Agents / Q000008:administration & dosage* / Q000737:chemistry; D001483:Base Sequence; D029043:Ebolavirus / Q000235:genetics* / Q000378:metabolism; D005814:Genes, Viral; D006168:Guinea Pigs; D019142:Hemorrhagic Fever, Ebola / Q000401:mortality / Q000628:therapy* / Q000821:virology; D008379:Marburg Virus Disease / Q000401:mortality / Q000628:therapy* / Q000821:virology; D029024:Marburgvirus / Q000235:genetics* / Q000378:metabolism; D051379:Mice; D060172:Morpholinos / Q000008:administration & dosage* / Q000737:chemistry; D020319:Oligodeoxyribonucleotides, Antisense / Q000008:administration & dosage* / Q000737:chemistry; D011323:Primates; D014176:Protein Biosynthesis / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012367:RNA, Viral / Q000235:genetics / Q000378:metabolism
chemical_list: C000599943:AVI-7288; D000998:Antiviral Agents; D060172:Morpholinos; D020319:Oligodeoxyribonucleotides, Antisense; D012333:RNA, Messenger; D012367:RNA, Viral