Hepatitis B virus X protein, and polyploidy in the
development of HCC
DNA rereplication induced by viral protein
978-3-639-04708-0
3639047087
144
2009-06-23
59,00 €
eng
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Hepatitis B Virus (HBV) X protein (pX) is implicated
by an unknown mechanism in
hepatocellular carcinoma (HCC) development,
characterized by increased rate of
chromosomal aberrations. Although most patients clear
the infection and develop
immunity, chronic infection in 5 to 10% infected
patients lead to HCC development in
the 4th to 5th decade of life. I demonstrate that
tetracycline-regulated pX expression
induces multipolar spindles and polyploidy (>4N DNA).
To understand the mechanism
of pX-mediated polyploidy, I investigated whether pX
promotes DNA re-replication.
Dual-parameter flow cytometry demonstrates
pX-dependent BrdU incorporation in cells
with >4N DNA. pX also induces expression of
replication initiation factors Cdc6 and
Cdtl, while suppressing geminin expression, a
negative regulator of re-replication. G2-
phase synchronized cells exhibit pX-dependent: i)
nuclear Cdc6 and Mcm5 colocalization;
ii) absence of nuclear geminin; iii) increased BrdU
incorporation; iv) ATR
activation; v) RAD17 and H2AX phosphorylation; and
vi) co-localization of γ-H2AX
with the DNA elongation factor PCNA.
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