IMMUNOCYTOCHEMISTRY

Thursday, October 16, 2003

Description
Procedures for cell plating, fixing, antibody incubation and mounting

Procedure
A. Plating:

To sterilize glass coverslips, dip in ethanol and flame.
We use 22x22x1 mm3 coverslips and put them in 6-well plates.
Seed 100,000 cells per well overnight and fix the next day.

B. Fixation:

Remove the media and rinse once with PBS.
Remove the PBS and immediately add -20C methanol. (Do not allow the cells to dry.)
Put the plate in a -20C freezer for 5 min.
Remove the methanol and add PHEM buffer. Fixed cells are kept at 4C in PHEM.

C. Antibody incubation:

Block with appropriate sera (2.5 to 5%) in PHEM buffer for 1 hr with gentle rocking.
Add primary antibody to the blocking buffer and incubate for 1 hr with gentle rocking.
Remove and wash 4 x 10 min with PHEM buffer.
Add secondary antibody in PHEM buffer with sera and incubate for 30 min with gentle rocking.
Remove and wash 4 x 10 min with PHEM buffer.

D. Mounting:

Pick up coverslip with forceps and drain away excess buffer (can gently aspirate if desired).
Put ~20 l "antifade" on slide and gently lay coverslip on top.
After removing excess antifade, either by blotting with Kimwipe or aspirating, seal with clear nail polish.

KEEP IN THE DARK AT ALL TIMES.
Store in -20C freezer.

Recipes
PHEM buffer:
25 mM HEPES
10 mM EGTA
60 mM PIPES
2 mM MgCl2
pH = 6.9
(Add in this order.)
Antifade: 1 ml
1 mg p-phenylene diamine hydrochloride
Dissolve in 0.1 ml 10x PBS (20 min at RT)
Add 0.9 ml 100% glycerol
Keep covered at all times and no vortexing.
If it turns brown, its no good.
Aliquot and store at -70C.

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