(8-OHdG)
[7–12].
The
increased
DNA
damage
and
MN
in
peripheral
lymphocytes
from
workers
exposed
to
crystalline
silica
were
found
in
some
epidemiologic
studies
[13,14].
In
addition,
several
studies
in
vitro
demonstrated
that
BPs
after
specific
activations
were
able
to
induce
genotoxic
effects.
These
genotoxic
effects
may
be
associated
with
oxidative
stress
induced
by
BPs.
Geh
et
al.
[15]
reported
that
MN
was
slightly
increased
after
exposure
of
human
fibroblasts
to
active
BPs
(activated
with
HCL)
in
cytokinesis-block
micronucleus
(CBMN)
assay,
and
the
increased
MN
was
related
to
reactive
oxygen
species
generation
induced
by
BPs.
In
our
recent
work,
a
signif-
icant
dose-related
increase
in
DNA
damage
and
MN
induced
by
organic
BPs
(activated
with
alkyl
quaternary
ammonium
salt)
or
active
BPs
(activated
with
H2SO4)
in
human
B
lymphoblast
cells
were
observed
using
comet
assay
and
CBMN
assay
[16,17].
Active
BPs
(activated
with
H2SO4)
could
induce
higher
levels
of
ROS
gener-
ation,
superoxide
dismutase
[18]
inhibition
and
malondialdehyde
(MDA,
a
biomarker
of
lipid
peroxidation)
in
cultures
of
human
B
lymphoblast
cells,
as
compared
with
native
BPs
or
gypsum
control
[19].
(8-OHdG) [7–12]. The increased DNA damage and MN in peripheral lymphocytes from workers exposed to crystalline silica were found in some epidemiologic studies [13,14]. In addition, several studies in vitro demonstrated that BPs after specific activations were able to induce genotoxic effects. These genotoxic effects may be associated with oxidative stress induced by BPs. Geh et al. [15] reported that MN was slightly increased after exposure of human fibroblasts to active BPs (activated with HCL) in cytokinesis-block micronucleus (CBMN) assay, and the increased MN was related to reactive oxygen species generation induced by BPs. In our recent work, a signif- icant dose-related increase in DNA damage and MN induced by organic BPs (activated with alkyl quaternary ammonium salt) or active BPs (activated with H2SO4) in human B lymphoblast cells were observed using comet assay and CBMN assay [16,17]. Active BPs (activated with H2SO4) could induce higher levels of ROS gener- ation, superoxide dismutase [18] inhibition and malondialdehyde (MDA, a biomarker of lipid peroxidation) in cultures of human B lymphoblast cells, as compared with native BPs or gypsum control [19].
การแปล กรุณารอสักครู่..
