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Abstract: Restriction of poliovirus RNA replication in persistently infected nerve cells

  [ 46 votes ]   [ Discuss This Article ] • May 9, 2002

J Gen Virol 2002 May;83(Pt 5):1087-93

Girard S, Gosselin AS, Pelletier I, Colbere-Garapin F, Couderc T, Blondel B.

Unite de Neurovirologie et Regeneration du Systeme Nerveux, Institut Pasteur, 28 rue du Docteur Roux, 75724 Paris cedex 15, France.

The aetiology of post-polio syndrome may involve persistence of poliovirus
(PV) in the CNS. PV persists in the CNS of infected paralysed mice for over a year after the acute phase of paralytic poliomyelitis. However, infectious PV particles cannot be recovered from homogenates of CNS from paralysed mice after the acute phase of disease, indicating that PV replication is restricted.

To identify the molecular mechanism by which PV replication is limited, PV RNA synthesis was analysed by estimating the relative level of genomic
(plus-strand) and complementary (minus-strand) PV RNA in the CNS of persistently infected mice. PV RNA replication decreased during the 6 months following onset of paralysis, due mainly to inhibition of plus-strand RNA synthesis. Thus, restriction of PV RNA synthesis may contribute to persistence by limiting virus replication in the mouse CNS. Interestingly, viral RNA replication was similarly inhibited in neuroblastoma IMR-32 cell cultures persistently infected with PV.

This in vitro model thus shows that cellular factors play a role in the inhibition of viral RNA synthesis.

PMID: 11961263 [PubMed - in process]

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