Introduction
Immunohistochemistry is used to identify the loca-
tion and distribution of target antigens in cells or
tissues by staining with a specific antibody. The
antibody is conjugated to either a fluorescent or
colorimetric label, and the location of the label
seen through a microscope approximates the posi-
tion of the target antigen. We present here a
method for staining of cervical tissue.
Purpose
Procedure for indirect staining of cytokines in
paraformaldehyde fixed cryostat sections with
monoclonal antibodies.
Procedure from Walid Al-Saleh Thesis (ULG, Pr.
Boniver Service of Anatomo-pathology), Liege,
Belgium. The cytokines IL-2, IL-4, IL-6, IL-10, IL-12,
IFN- γ and TNF-α proteins in cervical biopsies were
detected by an original immunohistology tech-
nique.
Materials and Equipment
• Frozen sections of sample tissues
• Refrigerator (4ºC)
• Glass slides
• Primary antibody
• Coverslips
• Secondary antibody
• 4% Paraformaldehyde, pH 7.4
• Hematoxylin
• 1% Goat Serum in TBS/Saponin
•Ethanol
• Diaminobenzidine (DAB) substrate solution
• Microscope
• Tris-buffered Saline, 0.1% Saponin, pH 7.4
• Tris-buffered Saline/0.3% H2O2/0.1% Saponin,
0.02% NaN3
• Avidin/Biotin/Peroxidase
(Vectastain, Vector Labs)
Protocol
1. Dry frozen tissue sec-
tions of 8 µm thickness
at room temperature
for 2 hours.
2. Fix sections with 4%
paraformaldehyde for
15 minutes at room
temperature.
3. Wash slides 2X, 4 min-
utes each, with
TBS/0.1% saponin.
4. Block endogenous peroxi-
dase by incubating 30 min-
utes in TBS/0.3% H2O2/0.1%
Saponin, 0.02% NaN3.
5. Wash slides 3X, 3 minutes each,
with TBS/saponin.
6. Block non-specific binding sites with 1/100
diluted goat serum in TBS/saponin for 20
minutes.
7. Incubate overnight at 4ºC, with the appro-
priate antibody.
8. Wash slides 4 times in TBS/saponin, incu-
bate the slides with biotinylated secondary
antibody for 30 minutes.
9. Add avidin-biotin-peroxidase reagents, and
reveal the resulting peroxidase activity by
incubating the slides with a 0.5 mg/mL
HRP substrate solution (DAB + H2O2 pre-
pared in distilled water).
10. Wash slides 4X in TBS.
11. Counterstain for 1 minute with hema-
toxylin.
12. Dehydrate slides with sequential ethanol
washes of 1 minute each starting with
75%, followed by 80% and finishing with
a 100% ethanol wash.
13. Seal slides.
14. Analyze by optical microscopy.
Note: It is not necessary to add detergent to the TBS buffer. The
protocol can be followed s is with saponin omitted from all buffers
when staining CDs.
B I O S O U R C E
For research use only.
BioSource USA 800.242.0607 • tech.support@biosource.com
BioSource Europe +32.67.88.99.99 • tech.support@biosource.be
Ihc503
w w w . b i o s o u r c e . c o m
Immunohistochemistry
Protocol
Cytokine Antibodies
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