title: Entry of mouse hepatitis virus 3 into cells.
abstract: The involvement of lysosomes in infection by mouse hepatitis virus 3 (MHV3) was studied. L cells were infected with MHV3 in the presence of NH4Cl or chloroquine, weak bases which increase the intralysosomal pH and impair lysosomal functions. NH4Cl significantly inhibited virus-induced cytopathic effects and MHV3 replication, but did not prevent the attachment of 3H-labelled virus. No inhibition of MHV3 replication by NH4Cl and chloroquine was observed when lysosomotropic agents were added later than 3 h post-infection, suggesting the direct involvement of lysosomes in release of the viral genome into cytoplasm. These results, together with the lack of antibody-mediated immune lysis of MHV3-infected cells, suggest that MHV3 entered cells by an endocytic pathway (viropexis) followed by internalization into cellular lysosomes.
mesh_terms: D000643:Ammonium Chloride / Q000494:pharmacology; D000818:Animals; D002738:Chloroquine / Q000494:pharmacology; D003588:Cytopathogenic Effect, Viral; D006524:Hepatitis, Viral, Animal / Q000382:microbiology*; D007739:L Cells / Q000187:drug effects / Q000382:microbiology; D008247:Lysosomes / Q000187:drug effects / Q000382:microbiology; D051379:Mice; D006517:Murine hepatitis virus / Q000187:drug effects / Q000472:pathogenicity; D014779:Virus Replication / Q000187:drug effects
chemical_list: D000643:Ammonium Chloride; D002738:Chloroquine