Enhanced detection and study of murine norovirus-1 using a more efficient microglial cell line

Cox Courtney, Cao Shengbo, Lu, Lu Yuanan

Description

Human Noroviruses are the predominant cause of non-bacterial gastroenteritis worldwide. To facilitate prevention and control, a norovirus isolated from mice can provide a model to understand human noroviruses. To establish optimal viral infectivity conditions for murine noroviruses, several cell lines of hematopoietic lineage, including murine BV-2, RAW 264.7, and TIB, as well as human CHME-5, were tested comparatively for their sensitivity to murine norovirus-1. Results Except for CHME-5, all three murine-derived cell lines were susceptible to MNV infection. Viral infection of these cells was confirmed by RT-PCR. Using both viral plaque and replication assays, BV-2 and RAW 264.7 cells were determined to have comparable sensitivities to MNV-1 infection. Comparisons of cell growth characteristics, general laboratory handling and potential in-field applications suggest the use of BV-2 to be more advantageous. Conclusion Results obtained from these studies demonstrate that an immortalized microglial cell line can support MNV-1 replication and provides a more efficient method to detect and study murine noroviruses, facilitating future investigations using MNV-1 as a model to study, detect, and control Human Norovirus.

Informations

• Publié par: biomed
• Publié le: 01 janvier 2009
• Nombre de lectures: 7
• Langue: English

Extrait

Virology Journal

BioMedCentral

Open Access Research Enhanced detection and study of murine norovirus1 using a more efficient microglial cell line 1 2 2 Courtney Cox , Shengbo Cao and Yuanan Lu*

1 2 Address: Department of Microbiology, College of Natural Sciences, University of Hawaii at Manoa, Honolulu, HI 96822, USA and Department of Public Health Sciences, John A. Burns School of Medicine, University of Hawaii at Manoa, Honolulu, HI 96822, USA Email: Courtney Cox  [e-mail]; Shengbo Cao  [e-mail]; Yuanan Lu*  [e-mail] * Corresponding author

Published: 10 November 2009 Received: 18 September 2009 Accepted: 10 November 2009 Virology Journal2009,6:196 doi:10.1186/1743422X6196 This article is available from: http://www.virologyj.com/content/6/1/196 © 2009 Cox et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract Background:Human Noroviruses are the predominant cause of nonbacterial gastroenteritis worldwide. To facilitate prevention and control, a norovirus isolated from mice can provide a model to understand human noroviruses. To establish optimal viral infectivity conditions for murine noroviruses, several cell lines of hematopoietic lineage, including murine BV2, RAW 264.7, and TIB, as well as human CHME5, were tested comparatively for their sensitivity to murine norovirus1.

Results:Except for CHME5, all three murinederived cell lines were susceptible to MNV infection. Viral infection of these cells was confirmed by RTPCR. Using both viral plaque and replication assays, BV2 and RAW 264.7 cells were determined to have comparable sensitivities to MNV1 infection. Comparisons of cell growth characteristics, general laboratory handling and potential infield applications suggest the use of BV2 to be more advantageous.

Conclusion:Results obtained from these studies demonstrate that an immortalized microglial cell line can support MNV1 replication and provides a more efficient method to detect and study murine noroviruses, facilitating future investigations using MNV1 as a model to study, detect, and control Human Norovirus.

Background Noroviruses belong to the familyCaliciviridaeand are a group of small, icosahedral, nonenveloped, positive strand RNA viruses [16]. Most norovirus genomes range from 7.77.9 KB and contain three highly conserved open reading frames (ORF)[3]. Human Norovirus (HNV) strains are the predominant cause of nonbacterial gastro enteritis worldwide and are primarily transmitted through the fecaloral route, usually by the consumption of con taminated food or water [13,712].

Despite worldwide occurrence and high level of inci dence, there are no drug treatments or vaccines available to date. In fact, little is known about human norovirus biology due to the lack of a cell culture system or small animal model for use in studies [7,9,1316]. To facilitate the prevention and control of this human pathogen, a norovirus isolated from murine animals is currently con sidered as a model to understand human norovirus repli cation, life cycle, pathogenesis, and host immune response [7,14]. Recent studies have demonstrated that

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