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Viruses 2011, 3(10), 1815-1835; doi:10.3390/v3101815
Article

Inhibition of Geranylgeranyl Transferase-I Decreases Cell Viability of HTLV-1-Transformed Cells

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Received: 13 September 2011; Accepted: 26 September 2011 / Published: 10 October 2011
(This article belongs to the Special Issue Recent Developments in HTLV Research)
Download PDF [1431 KB, uploaded 10 October 2011]
Abstract: Human T-cell leukemia virus type-1 (HTLV-1) is the etiological agent of adult T-cell leukemia (ATL), an aggressive and highly chemoresistant malignancy. Rho family GTPases regulate multiple signaling pathways in tumorigenesis: cytoskeletal organization, transcription, cell cycle progression, and cell proliferation. Geranylgeranylation of Rho family GTPases is essential for cell membrane localization and activation of these proteins. It is currently unknown whether HTLV-1-transformed cells are preferentially sensitive to geranylgeranylation inhibitors, such as GGTI-298. In this report, we demonstrate that GGTI-298 decreased cell viability and induced G2/M phase accumulation of HTLV-1-transformed cells, independent of p53 reactivation. HTLV-1-LTR transcriptional activity was inhibited and Tax protein levels decreased following treatment with GGTI-298. Furthermore, GGTI-298 decreased activation of NF-κB, a downstream target of Rho family GTPases. These studies suggest that protein geranylgeranylation contributes to dysregulation of cell survival pathways in HTLV-1-transformed cells.
Keywords: human T-cell leukemia virus type-1; HTLV-1; Tax; long terminal repeat; LTR; geranylgeranyltransferase; GGTI-298; small GTPase; NF-κB; p53; cell cycle human T-cell leukemia virus type-1; HTLV-1; Tax; long terminal repeat; LTR; geranylgeranyltransferase; GGTI-298; small GTPase; NF-κB; p53; cell cycle
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Edwards, D.C.; McKinnon, K.M.; Fenizia, C.; Jung, K.-J.; Brady, J.N.; Pise-Masison, C.A. Inhibition of Geranylgeranyl Transferase-I Decreases Cell Viability of HTLV-1-Transformed Cells. Viruses 2011, 3, 1815-1835.

AMA Style

Edwards DC, McKinnon KM, Fenizia C, Jung K-J, Brady JN, Pise-Masison CA. Inhibition of Geranylgeranyl Transferase-I Decreases Cell Viability of HTLV-1-Transformed Cells. Viruses. 2011; 3(10):1815-1835.

Chicago/Turabian Style

Edwards, Dustin C.; McKinnon, Katherine M.; Fenizia, Claudio; Jung, Kyung-Jin; Brady, John N.; Pise-Masison, Cynthia A. 2011. "Inhibition of Geranylgeranyl Transferase-I Decreases Cell Viability of HTLV-1-Transformed Cells." Viruses 3, no. 10: 1815-1835.


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