Journal of Microbiology

Hyungtaek Jeon

2 Articles

Rab27b regulates extracellular vesicle production in cells infected with Kaposi’s sarcoma–associated herpesvirus to promote cell survival and persistent infection: Hyungtaek Jeon , Su-Kyung Kang , Myung-Ju Lee , Changhoon Park , Seung-Min Yoo , Yun Hee Kang , Myung-Shin Lee; J. Microbiol. 2021;59(5):522-529. Published online April 20, 2021; DOI: https://doi.org/10.1007/s12275-021-1108-6

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Extracellular vesicles (EVs) play a crucial role in cell-to-cell communication. EVs and viruses share several properties related to their structure and the biogenesis machinery in cells. EVs from virus-infected cells play a key role in virus spread and suppression using various loading molecules, such as viral proteins, host proteins, and microRNAs. However, it remains unclear how and why viruses regulate EV production inside host cells. The purpose of this study is to investigate the molecular mechanisms underlying EV production and their roles in Kaposi’s sarcoma-associated herpesvirus (KSHV)-infected cells. Here, we found that KSHV induced EV production in human endothelial cells via Rab- 27b upregulation. The suppression of Rab27b expression in KSHV-infected cells enhanced cell death by increasing autophagic flux and autolysosome formation. Our results indicate that Rab27b regulates EV biogenesis to promote cell survival and persistent viral infection during KSHV infection, thereby providing novel insights into the crucial role of Rab- 27b in the KSHV life cycle.

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Latent Kaposi’s sarcoma-associated herpesvirus infection in bladder cancer cells promotes drug resistance by reducing reactive oxygen species: Suhyuk Lee , Jaehyuk Jang , Hyungtaek Jeon , Jisu Lee , Seung-Min Yoo , Jinsung Park , Myung-Shin Lee; J. Microbiol. 2016;54(11):782-788. Published online October 29, 2016; DOI: https://doi.org/10.1007/s12275-016-6388-x

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Abstract PDF

Kaposi’s sarcoma-associated herpesvirus (KSHV) is the major etiologic agent of Kaposi’s sarcoma, primary effusion lymphoma, and multicentric Castleman’s disease. Recent studies have indicated that KSHV can be detected at high frequency in patient-derived bladder cancer tissue and might be associated with the pathogenesis of bladder cancer. Bladder cancer is the second most common cancer of the genitourinary tract, and it has a high rate of recurrence. Because drug resistance is closely related to chemotherapy failure and cancer recurrence, we investigated whether KSHV infection is associated with drug resistance of bladder cancer cells. Some KSHV-infected bladder cancer cell lines showed resistance to an anti-cancer drug, cisplatin, possibly as a result of downregulation of reactive oxygen species. Additionally, drug resistance acquired from KSHV infection could partly be overcome by HDAC1 inhibitors. Taken together, the data suggest the possible role of KSHV in chemo-resistant bladder cancer, and indicate the therapeutic potential of HDAC1 inhibitors in drug-resistant bladder cancers associated with KSHV infection.

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