Oncotropic H-1 parvovirus infection degrades HIF-1α protein in human pancreatic cancer cells independently of VHL and RACK1.

Abstract:

:Overexpression of HIF-1α, a transcription factor responsive to hypoxia, is frequently observed in malignant tumors, which sometimes show resistance to chemotherapy and radiation therapy. Consequently, decrease of HIF-1α through virotherapy offers a logical strategy for the treatment of aggressive tumors. In this study, we found that infection with the oncolytic H-1 parvovirus decreased HIF-1α protein levels in pancreatic cancer cells under CoCl2 or hypoxia. The H-1 virus-induced decrease of HIF-1α was regulated by a proteasome-mediated pathway. Suppression of VHL, an E3 ligase and a critical regulator of HIF-1α, or enforced expression of UCP, an E2 ubiquitin-conjugating enzyme, failed to inhibit the H-1 virus-induced decrease of HIF-1α. Furthermore, siRNA-mediated suppression of RACK1, another regulator of HIF-1α, did not prevent H-1 viral infection from lowering HIF-1α protein levels. Although decrease of HIF-1α was observed after H-1 viral infection, constitutive expression of HIF-1α limited H-1 viral replication. After combined treatment with H-1 parvovirus and YC-1, an inhibitor of HIF-1α, the apoptosis of pancreatic cancer cells was greater than after treatment with H-1 virus alone or YC-1 alone. Accordingly, we propose that H-1 parvovirus could be used with YC-1 as a potential therapeutic agent against aggressive tumors exhibiting hypoxia and increased levels of HIF-1α.

journal_name

Int J Oncol

authors

Cho IR,Kaowinn S,Moon J,Soh J,Kang HY,Jung CR,Oh S,Song H,Koh SS,Chung YH

doi

10.3892/ijo.2015.2922

subject

Has Abstract

pub_date

2015-05-01 00:00:00

pages

2076-82

issue

5

eissn

1019-6439

issn

1791-2423

journal_volume

46

pub_type

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