Journal of Microbiology

Hey Rhyoung Lyoo

2 Articles

Extended stability of cyclin D1 contributes to limited cell cycle arrest at G1-phase in BHK-21 cells with Japanese encephalitis virus persistent infection: Ji Young Kim , Soo Young Park , Hey Rhyoung Lyoo , Eung Seo Koo , Man Su Kim , Yong Seok Jeong; J. Microbiol. 2015;53(1):77-83. Published online January 4, 2015; DOI: https://doi.org/10.1007/s12275-015-4661-z

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There is increasing evidence that many RNA viruses manipulate cell cycle control to achieve favorable cellular environments for their efficient replication during infection. Although virus-induced G0/G1 arrest often delays early apoptosis temporarily, a prolonged replication of the infected virus leads host cells to eventual death. In contrast, most mammalian cells with RNA virus persistent infection often escape cytolysis in the presence of productive viral replication. In this study, we demonstrated that the extended endurance of cyclin D1 was clearly associated with the suppression of glycogen synthase kinase-3β (GSK-3β) expression in BHK-21 cells that are persistently infected with Japanese encephalitis virus (JEV). The G0/G1 arrest of these cells turned much loose compared to the normal BHK-21 cells with JEV acute infection. After cycloheximide treatment, cyclin D1 in the persistently infected cells lasted several hours longer than those in acutely infected cells. Furthermore, both p21Cip1 and p27Kip1, positive regulators for cyclin D1 accumulation in the nucleus, were suppressed in their expression, which contrasts with those in JEV acute infection. Inhibition of the GSK-3β by lithium chloride treatment rescued a significant number of cells from cytolysis in JEV acute infection, which coincided with the levels of cyclin D1 that escaped from proteolysis. Therefore, the limitation of G1/S arrest in the BHK-21 cells with JEV persistent infection is associated with the suppression of GSK-3β expression, resulting in the extended duration of cyclin D1.

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Reliability of Non-Culturable Virus Monitoring by PCR-Based Detection Methods in Environmental Waters Containing Various Concentrations of Target RNA: Eung Seo Koo , Chang-Hoon Yoo , Youjin Na , Soo Young Park , Hey Rhyoung Lyoo , Yong Seok Jeong; J. Microbiol. 2012;50(5):726-734. Published online November 4, 2012; DOI: https://doi.org/10.1007/s12275-012-2279-y

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Abstract PDF

Owing to the lack of practical cell culture system for human noroviruses (HuNoV), various detection methods based on conventional reverse transcription-PCR (RT-PCR) and the quantitative real-time PCR have been major tools for monitoring environmental water safety. In this study, we showed that the proportion of water sample concentrates used for one-step RT-PCR significantly influences false-negative findings of the non-culturable viruses. In total, 59 archived samples of previously analyzed water concentrates were reexamined for HuNoV RNA by the one-step RT-PCR and semi-nested PCR. Using new aliquots for RNA extraction for every trial, up to 20 PCR trials were performed for each archive to determine whether the crosscheck results supported the previous determinations. We reconfirmed that 27.6% (8/29) of the samples were HuNoV-positive samples: 6.7% (1/15) from groundwater, 33.3% (3/9) from river water, and 80% (4/5) from treated sewage effluent (TSE). These results corresponded to the ratio of previously negative HuNoV samples now identified as positive (8/30): 6.7% (1/15) from groundwater, 20% (1/5) from river water, and 60% (6/10) from TSE. To elucidate the cause of these results, 16 different concentrations of murine norovirus (MNV) RNA (from 2×102 to 8×103 copies, divided into 10 tubes for each concentration) were subjected to one-step RT-PCR. The detection frequency and reproducibility decreased sharply when the number of MNV RNA copies fell below threshold levels. These observations suggest that the proportion of water concentrate used for PCR-based detection should be considered carefully when deciding viral presence in certain types of environmental water, particularly in regard with legal controls.

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