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Potential use of retrograde axoplasmic flow to eradicate virus persistence in ganglionic cells was studied in a new herpes simplex virus (HSV) persistence model in rat trigeminal ganglia. After injection of the F strain of HSV type 1 into the mental nerve, viral antigens were detectable in the ganglia by the immunofluorescence and peroxidase methods between postinoculation (p.i.) days 3 and 6 but not thereafter. None of 82 inoculated rats showed signs of acute illness, and some survived for more than 502 days without symptoms. By cocultivation of ganglion tissues with Vero cells, the virus was isolated from 42 of 49 ganglia (85.7%) between 15 and 386 days (p.i.). HSV DNA was solely localized in the nucleus of neurons by immunoperoxidase staining of paraffin sections with a biotinylated HSV DNA probe, and the presence of HSV DNA-positive cells was confirmed in four of four ganglia on p.i. day 6 and in five of six on p.i. day 502. The efficacy of axoplasmic flow in drug delivery to ganglionic cells was investigated by injection of doxorubicin (ADM) into the nerve once used for virus inoculation. As early as 19 h after injection, strong ADM-specific autofluorescence was seen in the nuclei of neurons parental to the mental nerve and in those of adjacent Schwann cells, and the death of ADM-positive cells subsequently ensued. A single injection of ADM reduced the virus isolation rate from 31/37 (84%) to 3/37 (8%).

Eradication of herpes simplex virus persistence in rat trigeminal ganglia by retrograde axoplasmic transport