Abstract
Susceptible BALB/c mice, after experimental infection with mouse hepatitis virus 3 (MHV3), revealed virus titres in the liver that increased gradually to a peak of 8 × 105 PFU/g of tissue after 3 days' infection, when the mice died of acute hepatitis. BALB/c mice were infected with MHV3, subsequently labelled in vivo with 35S-methionine, and then the liver preparations from both infected and non-infected animals were subjected to two-dimensional gel electrophoresis. Comparisons of the patterns by computer image analysis revealed 17 gene products which increased, and 8 gene products which decreased, upon virus infection in their two-dimensional gel spot intensity. We conclude that during MHV3 infection of a susceptible strain of mice, a major modification in protein synthesis occurs. The pattern alterations were not related to the virus gene products but were mostly endogenous mouse proteins. Whether these proteins are a result of a defence attempt by the animal, or are dictated by the virus in order to prevent a protective response from happening, remains to be shown.
Key-words: Coronavirus, Mouse hepatitis, Protein; Synthesis, Liver, Virus 3, In vivo labelling, Defences
Abstract
Des souris BALB/c infectées expérimentalement par le virus 3 de l'hépatite murine voient leur titre en virus croître progressivement jusqu'à 8 × 105 PFU/g de tissu 3 jours après l'infection, moment où les souris meurent d'hépatite aiguë. Après l'infection par le virus, les souris ont été marquées in vivo par la 35S-méthionine et des préparations de foie des animaux infectés et des animaux témoins ont été soumises à une électrophorèse bidimensionnelle. L'analyse comparée des images à l'aide d'un ordinateur a révélé que 17 protéines étaient détectées en plus grande quantité, alors que 8 autres étaient moins abondantes chez les souris infectées. Nous concluons que, pendant l'infection par le virus, les animaux sensibles présentent d'importantes perturbations des synthèses protéiques. Ces altérations concernent les protéines produites par la souris et non des produits de synthèse du virus. Il reste à déterminer si ces altérations sont le résultat d'une défense de l'animal ou si elles sont dictées par le virus afin d'enrayer une réponse de l'hôte.
Mots-clés: Coronavirus, Hépatite murine, Protéine; Synthèse, Foie, Marquage in vivo, Défenses
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