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Identifying Dysregulated Genes Induced by Kaposi's Sarcoma-associated Herpesvirus KSHV
07:02

Identifying Dysregulated Genes Induced by Kaposi's Sarcoma-associated Herpesvirus KSHV

Published on: September 14, 2010

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Degradation of TRIM32 is induced by RTA for Kaposi's sarcoma-associated herpesvirus lytic replication

Yulin Zhang1, Zhongwei Dong1, Feng Gu1

  • 1MOE/NHC/CAMS Key Laboratory of Medical Molecular Virology, Shanghai Institute of Infections Disease and Biosecurity, Shanghai Frontiers Science Center of Pathogenic Microorganism and Infection, School of Basic Medical Science, Shanghai Medical College, Fudan University, Shanghai, China.

Journal of Virology
|May 8, 2024
PubMed

Insights

Kaposi's sarcoma-associated herpesvirus (KSHV) upregulates TRIM32 during latency. Viral lytic replication triggers RTA to degrade TRIM32, promoting KSHV reactivation and potentially offering a therapeutic target for KSHV cancers.

Area of Science:

  • Virology
  • Oncology
  • Molecular Biology

Background:

  • Trimer interacting protein 32 (TRIM32) is frequently dysregulated in various cancers.
  • Kaposi's sarcoma-associated herpesvirus (KSHV) is implicated in human malignancies, with its lytic replication playing a key role in tumorigenesis.
  • The specific function of TRIM32 in herpesvirus replication and oncogenesis is not well understood.

Purpose of the Study:

  • To investigate the role of TRIM32 in KSHV infection and replication.
  • To elucidate the mechanism by which KSHV influences TRIM32 expression.
  • To assess the therapeutic potential of targeting TRIM32 in KSHV-associated cancers.

Main Methods:

  • Analysis of TRIM32 expression in KSHV-infected cells (Primary Effusion Lymphoma - PEL cells) during latency and lytic replication.
  • Investigating the interaction between KSHV's Replication and Transcription Activator (RTA) and TRIM32.
  • Utilizing proteasome inhibitors to study TRIM32 degradation pathways.
  • Assessing the impact of TRIM32 inhibition on PEL cell proliferation, apoptosis, and KSHV lytic reactivation.

Main Results:

  • TRIM32 expression is elevated by KSHV during latency.
  • KSHV lytic replication reactivation leads to TRIM32 downregulation in PEL cells.
  • KSHV RTA directly interacts with TRIM32 and promotes its proteasomal degradation.
  • TRIM32 inhibition induces apoptosis, reduces proliferation, and enhances KSHV lytic replication and virion production.

Conclusions:

  • TRIM32 degradation, mediated by KSHV RTA, is essential for KSHV lytic replication.
  • Targeting TRIM32 degradation presents a potential therapeutic strategy for KSHV-associated cancers.
Keywords:
KSHVRTATRIM32lytic replication

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