TE antigen retrieval and immunostaining: Difference between revisions
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=== Material === | === Material === | ||
'''Tris-EDTA Buffer''' | '''Tris-EDTA Buffer''' | ||
final concentration: 10mM Tris base, 1mM EDTA Solution, 0.05% Tween 20, pH 9.0: | final concentration: 10mM Tris base, 1mM EDTA Solution, 0.05% Tween 20, pH 9.0: | ||
* 1.21g [[Tris]] final 10mM | * 1.21g [[Tris]] final 10mM | ||
* 0.37g [[EDTA]] final 1mM | * 0.37g [[EDTA]] final 1mM | ||
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* 0.5ml [[Tween 20]] final 0.05% (for 1x) | * 0.5ml [[Tween 20]] final 0.05% (for 1x) | ||
The pH is typically around 9.0. Store the solution at room temperature for | The pH is typically around 9.0 with adjustment. Store the solution at room temperature for several weeks or at 4ºC for months. | ||
This buffer is basically a [[TE]] buffer with added Tween 20. | This buffer is basically a [[TE]] buffer with added Tween 20. | ||
=== Steps === | === Steps === | ||
* deparaffinise sections in xylene for 10min | * deparaffinise sections in xylene for 10min | ||
* hydration series | * hydration series | ||
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* remove the container and allow to cool at RT for 20 minutes | * remove the container and allow to cool at RT for 20 minutes | ||
* rinse sections in PBS Tween 20 for 2x2 min | * rinse sections in PBS Tween 20 for 2x2 min | ||
=== Comments === | === Comments === | ||
== Immunostaining == | == Immunostaining == | ||
Revision as of 12:29, 2 November 2009
This 2-part protocol describes antigen retrieval with Tris EDTA buffer followed by immunostaining. Antigen retrieval can be helpful for aldehyde-fixed, paraffin-embedded samples that don't give sufficient signal with a standard immunostaining protocol. Several antigen retrieval methods exist but, unfortunately, you need to determine empirically which one is most suited to your antibody.
Deparaffinisation
Tris EDTA heat-based antigen retrieval
Principle
- aldehyde treatment (paraformaldehyde, glutaraldehyde) chemically fixes cells and tissue
- paraffin-embedding allows very thin tissue sections to be cut
- however, some antibodies don't work well after aldehyde fixation and paraffin embedding as opposed to other fixatives and cryosections
- antigen retrieval methods can improve antibody binding by reversing chemical modification of epitopes or by unfolding/refolding epitopes
Material
Tris-EDTA Buffer final concentration: 10mM Tris base, 1mM EDTA Solution, 0.05% Tween 20, pH 9.0:
(or 100 ml to make 10x)
- 0.5ml Tween 20 final 0.05% (for 1x)
The pH is typically around 9.0 with adjustment. Store the solution at room temperature for several weeks or at 4ºC for months.
This buffer is basically a TE buffer with added Tween 20.
Steps
- deparaffinise sections in xylene for 10min
- hydration series
- 2 changes of 100% ethanol for 3 minutes each
- 95% ethanol 1min
- 80% ethanol 1min
- distilled water
- pre-heat steamer or water bath with container with Tris-EDTA Buffer until temperature reaches 95°C (do not boil)
- immerse slides, cover with lid, incubate for 10-40 minutes (optimal incubation time depends on tissue and antibody)
- remove the container and allow to cool at RT for 20 minutes
- rinse sections in PBS Tween 20 for 2x2 min
