2.5.
Cytokinesis-block
micronucleus
cytome
(CBMNcyt)
assay
CBMNcyt
assay
was
performed
on
the
basis
of
the
method
described
by
Fenech
[28].
The
0.5
ml
whole
blood
was
added
to
4.5
ml
RPMI
1640
(GIBCO)
containing
20%
fetal
calf
serum,
0.2
mg/ml
phytohaemagglutinin-M
(PHA-M,
GIBCO).
Two
inde-
pendent
cultures
for
each
sample
were
incubated
at
37
◦
C
for
72
h,
and
4.5
g/ml
cytochalasin
B
(Sigma)
was
added
to
each
culture
at
28
h
before
harvesting
cells.
The
cultures
were
harvested
at
72
h
after
the
initiation
by
centrifugation.
The
lym-
phocytes
were
subjected
to
mild
hypotonic
treatment
(0.075
M
KCl)
for
5
min,
then
fixed
in
fresh
fixative
solution
(methanol:acetic
acid
=
3:1)
for
20
min,
this
fixation
step
was
repeated
twice
after
a
20
min
storage
at
4
◦
C.
The
cell
suspension
was
dropped
on
microscope
slides
and
stained
with
10%
pH
6.8
Giemsa
solutions
for
10
min.
On
the
basis
of
scoring
criteria
described
by
Fenech
[28]
and
Thomas
et
al.
[29],
a
total
of
2000
binucleated
cells
per
sample
were
analyzed
to
determine
the
fre-
quencies
of
micronucleated
cells
(MCF),
micronuclei
(MNF),
nucleoplasmic
bridges
2.5. Cytokinesis-block micronucleus cytome (CBMNcyt) assay CBMNcyt assay was performed on the basis of the method described by Fenech [28]. The 0.5 ml whole blood was added to 4.5 ml RPMI 1640 (GIBCO) containing 20% fetal calf serum, 0.2 mg/ml phytohaemagglutinin-M (PHA-M, GIBCO). Two inde- pendent cultures for each sample were incubated at 37 ◦ C for 72 h, and 4.5 ?g/ml cytochalasin B (Sigma) was added to each culture at 28 h before harvesting cells. The cultures were harvested at 72 h after the initiation by centrifugation. The lym- phocytes were subjected to mild hypotonic treatment (0.075 M KCl) for 5 min, then fixed in fresh fixative solution (methanol:acetic acid = 3:1) for 20 min, this fixation step was repeated twice after a 20 min storage at 4 ◦ C. The cell suspension was dropped on microscope slides and stained with 10% pH 6.8 Giemsa solutions for 10 min. On the basis of scoring criteria described by Fenech [28] and Thomas et al. [29], a total of 2000 binucleated cells per sample were analyzed to determine the fre- quencies of micronucleated cells (MCF), micronuclei (MNF), nucleoplasmic bridges
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