title: Delivery of ultraviolet-inactivated 35S-herpesvirus across an osmotically modified blood-brain barrier.
abstract: The present studies were undertaken to determine if viral particles can be delivered across the rat blood-brain barrier (BBB). Osmotic BBB modification with intracarotid mannitol (25%) was immediately followed by bolus intracarotid administration of 0.5 ml purified, ultraviolet-inactivated, herpes simplex virus type 1 endogenously labeled with 35S-labeled methionine (2.0 x 10(6) cpm, approximately 5 x 10(8) plaque-forming units/ml). After 60 minutes, intravascular virus was cleared by saline perfusion and the animals were sacrificed. A marked increase (fourfold, p less than or equal to 0.02) in radioactivity was observed in the ipsilateral brain hemisphere when compared to control animals without barrier modification. Administration of intravenous virus immediately after BBB modification displayed no difference in delivery when compared to intracarotid saline-infused controls (without BBB modification) suggesting the importance of a first-pass phenomenon. There were no significant differences in serum concentrations among intracarotid or intravenous groups. These preliminary studies suggest the possibility of delivering viral particles across the BBB with osmotic disruption, which may permit delivery of genetic material in replication-defective viral vectors in the feline model of GM2-gangliosidosis.
authors.affiliation: Department of Neurology, Oregon Health Sciences University, Portland.
authors.forename: E A
authors.initials: EA
authors.lastname: Neuwelt
authors.forename: M A
authors.initials: MA
authors.lastname: Pagel
authors.forename: R D
authors.initials: RD
authors.lastname: Dix
mesh_terms: D000818:Animals; D001812:Blood-Brain Barrier / Q000187:drug effects; D005260:Female; D005822:Genetic Vectors; D006564:Herpesviridae / Q000502:physiology / Q000528:radiation effects*; D008353:Mannitol / Q000494:pharmacology; D009995:Osmosis; D051381:Rats; D014466:Ultraviolet Rays; D014775:Virus Activation
chemical_list: D008353:Mannitol