Griffin:Antigen Retrieval Technique - Revision history

Korey Griffin: /* Heat Treatment */

Korey Griffin — Thu, 17 Dec 2009 22:56:28 GMT

Heat Treatment

←Older revision		Revision as of 22:56, 17 December 2009
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	==Heat Treatment==		==Heat Treatment==
		+
		+
		+	[[Image: ricecooker.jpg\|thumb\|right\|A standard Rice cooker is an effective heat/steam source for antigen unmasking]]

	10-20 minute heat treatment is a common range that is widely effective. The cooling process taking ~20 minutes. The main mechanism of heat-induced antigen retrieval is disruption of the cross-links and pH is also an essential factor for proper refolding of epitopes. For this reason a low pH and high pH buffer is a good contrast in optimizing the staining protocol.		10-20 minute heat treatment is a common range that is widely effective. The cooling process taking ~20 minutes. The main mechanism of heat-induced antigen retrieval is disruption of the cross-links and pH is also an essential factor for proper refolding of epitopes. For this reason a low pH and high pH buffer is a good contrast in optimizing the staining protocol.

Korey Griffin at 22:51, 17 December 2009

Korey Griffin — Thu, 17 Dec 2009 22:51:25 GMT

←Older revision		Revision as of 22:51, 17 December 2009
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-	Antigen Retrieval is a proven and effective method for optimizing tissue antigen detection of formalin-fixed, paraffin-embedded tissue sections. Pretreatment with an antigen retrieval reagent (Antigen unmasking) that reverses protein cross-~~links~~ formed by formalin fixation allows greater exposure for the antibody to associate with antigenic sites. ~~There are heat-based~~ (Microwave Oven, Pressure Cooker or Steamer/Rice Cooker) are ~~the most commonly used heating devices. Certain antigenic determinants are masked by formalin fixation~~ and ~~paraffin embedding and may be exposed~~. Below are ~~the most popular and~~ effective methods ~~from researchers performing these experiments~~.	+	Antigen Retrieval is a proven and effective method for optimizing tissue antigen detection of formalin-fixed, paraffin-embedded tissue sections. Pretreatment with an antigen retrieval reagent (Antigen unmasking) that reverses protein cross-linkage formed by formalin fixation allows greater exposure for the antibody to associate with antigenic sites. Heating methods (Microwave Oven, Pressure Cooker or Steamer/Rice Cooker) are common and effective. Below are a few effective methods to consider.

	==Heat Treatment==		==Heat Treatment==

Korey Griffin at 16:04, 13 May 2009

Korey Griffin — Wed, 13 May 2009 16:04:30 GMT

←Older revision		Revision as of 16:04, 13 May 2009
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-	Antigen Retrieval is a proven and effective method for optimizing tissue antigen detection of formalin-fixed, paraffin-embedded tissue sections. Pretreatment with an antigen retrieval reagent (Antigen unmasking) that reverses protein cross-links formed by formalin fixation allows greater exposure for the antibody to associate with antigenic sites. There are heat-based (Microwave Oven, Pressure Cooker or Steamer/~~Roce~~ Cooker) are the most commonly used heating devices. Certain antigenic determinants are masked by formalin fixation and paraffin embedding and may be exposed. Below are the most popular and effective methods from researchers performing these experiments.	+	Antigen Retrieval is a proven and effective method for optimizing tissue antigen detection of formalin-fixed, paraffin-embedded tissue sections. Pretreatment with an antigen retrieval reagent (Antigen unmasking) that reverses protein cross-links formed by formalin fixation allows greater exposure for the antibody to associate with antigenic sites. There are heat-based (Microwave Oven, Pressure Cooker or Steamer/Rice Cooker) are the most commonly used heating devices. Certain antigenic determinants are masked by formalin fixation and paraffin embedding and may be exposed. Below are the most popular and effective methods from researchers performing these experiments.

	==Heat Treatment==		==Heat Treatment==

Korey Griffin: /* Detergent Treatment */

Korey Griffin — Tue, 11 Nov 2008 19:14:41 GMT

Detergent Treatment

←Older revision		Revision as of 19:14, 11 November 2008
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	==Detergent Treatment==		==Detergent Treatment==

-	*Saponin: Incubate sections for 30 minutes in 0.05% saponin in deionized H2O at room temperature. Wash at least three times in PBS. Aspirate excess liquid from slides.	+	===Saponin===
		+	Incubate sections for 30 minutes in 0.05% saponin in deionized H2O at room temperature. Wash at least three times in PBS. Aspirate excess liquid from slides.

Korey Griffin: /* Trypsin */

Korey Griffin — Tue, 11 Nov 2008 19:14:25 GMT

Trypsin

←Older revision		Revision as of 19:14, 11 November 2008
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	===Trypsin===		===Trypsin===
-	Incubate sections for 10–20 minutes in 0.1% Trypsin PBS at room temperature. Wash slides several times in deionized H2O. Aspirate excess liquid from slides.	+	Incubate sections for 10–20 minutes in 0.1% Trypsin PBS at room temperature. Wash slides several times in deionized H2O. Aspirate excess liquid from slides.

	===Pepsin===		===Pepsin===

Korey Griffin: /* Enzymatic Treatment */

Korey Griffin — Tue, 11 Nov 2008 19:14:15 GMT

Enzymatic Treatment

←Older revision		Revision as of 19:14, 11 November 2008
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	3) Incubation temperature is usually at 37 °C.		3) Incubation temperature is usually at 37 °C.

-	*Trypsin ~~Antigen Retrieval:~~ Incubate sections for 10–20 minutes in 0.1% Trypsin PBS at room temperature. Wash slides several times in deionized H2O. Aspirate excess liquid from slides.	+	===Trypsin===
		+	Incubate sections for 10–20 minutes in 0.1% Trypsin PBS at room temperature. Wash slides several times in deionized H2O. Aspirate excess liquid from slides.

-	*Pepsin ~~Antigen Retrieval:~~ Incubate sections for 10–20 minutes in 0.1% pepsin in 0.01 N HCl at room temperature. Wash slides several times in deionized H2O. Aspirate excess liquid from slides.	+	===Pepsin===
		+	Incubate sections for 10–20 minutes in 0.1% pepsin in 0.01 N HCl at room temperature. Wash slides several times in deionized H2O. Aspirate excess liquid from slides.

	==Detergent Treatment==		==Detergent Treatment==

	*Saponin: Incubate sections for 30 minutes in 0.05% saponin in deionized H2O at room temperature. Wash at least three times in PBS. Aspirate excess liquid from slides.		*Saponin: Incubate sections for 30 minutes in 0.05% saponin in deionized H2O at room temperature. Wash at least three times in PBS. Aspirate excess liquid from slides.

Korey Griffin: /* Heat Treatment */

Korey Griffin — Tue, 11 Nov 2008 19:13:15 GMT

Heat Treatment

←Older revision		Revision as of 19:13, 11 November 2008
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	Below are 3 options to consider;		Below are 3 options to consider;

-	~~'''OPTION 1:'''~~ 10 mM sodium citrate buffer, pH 6.0.	+	===10 mM sodium citrate buffer, pH 6.0===

-	'''~~OPTION~~ 2:''' 50 mM glycine-HCl buffer, pH 3.5, with 0.01% (w/v) EDTA.	+	'''Summary:''' Heat at 95º C for 5 minutes. Top off with fresh buffer and heat at 95º C for 5 minutes (optimal incubation time may vary for each tissue type). Allow slides to cool in the buffer for approximately 20 minutes. Wash in deionized H2O three times for 2 minutes each. Aspirate excess liquid from slides.
		+
		+	'''Procedure:'''
		+
		+	Materials: Citrate or Glycine-EDTA buffer, a microwaveable plastic container with slide holder and a microwave with a rotating dish.
		+
		+	'''I)''' For consistency, fill the slide holder with slides even if only a couple of slides with tissues are being stained. Use clean slides with no tissue
		+	for that.
		+
		+	'''II)''' Fill the container with the citrate buffer, which is kept at ambient temperature.
		+
		+	'''III)''' Place the container with the slides and the buffer in the microwave and bring the buffer to a boil with the microwave at full power. This may take
		+	around 2 minutes depending on the microwave used. As soon as the buffer begins to boil the power is reduced to about 30% to allow intermitent boiling of the buffer. Keep the slides for 7 minutes under these conditions. This is done so the tissues don't come off the slides due to continuous boiling. Note: the amount of power used for this step will need to be determined for each microwave.
		+
		+	'''IV)''' The container is left at ambient temperature to cool down.
		+
		+	'''V)''' Once the buffer is near ambient temperature the slides with tissues are removed, washed briefly with 1xPBS and we proceed with the peroxidase
		+	blocking and antibody staining.
		+
		+	===50 mM glycine-HCl buffer, pH 3.5, with 0.01% (w/v) EDTA===

	'''Summary:''' Heat at 95º C for 5 minutes. Top off with fresh buffer and heat at 95º C for 5 minutes (optimal incubation time may vary for each tissue type). Allow slides to cool in the buffer for approximately 20 minutes. Wash in deionized H2O three times for 2 minutes each. Aspirate excess liquid from slides.		'''Summary:''' Heat at 95º C for 5 minutes. Top off with fresh buffer and heat at 95º C for 5 minutes (optimal incubation time may vary for each tissue type). Allow slides to cool in the buffer for approximately 20 minutes. Wash in deionized H2O three times for 2 minutes each. Aspirate excess liquid from slides.
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	blocking and antibody staining.		blocking and antibody staining.

-	~~'''OPTION 3:'''~~ 0.05% citraconic anhydride solution, pH 7.4	+	===0.05% citraconic anhydride solution, pH 7.4===

	Formaldehyde reacts predominantly with the lysyl residues and forms intramolecular cross-links. Citraconic anhydride reacts with the free amino groups of proteins and replaces the positively charged NH3 groups of lysyl residues with negatively charged carboxyl groups. Citraconic anhydride solution efficiently releases formaldehyde cross-links. Heat deparaffinized formalin fixed tissue sections in 0.05% citraconic anhydride solution, pH 7.4, at 98C for 45 min., followed by 3 wash steps.		Formaldehyde reacts predominantly with the lysyl residues and forms intramolecular cross-links. Citraconic anhydride reacts with the free amino groups of proteins and replaces the positively charged NH3 groups of lysyl residues with negatively charged carboxyl groups. Citraconic anhydride solution efficiently releases formaldehyde cross-links. Heat deparaffinized formalin fixed tissue sections in 0.05% citraconic anhydride solution, pH 7.4, at 98C for 45 min., followed by 3 wash steps.

Korey Griffin at 18:52, 13 October 2008

Korey Griffin — Mon, 13 Oct 2008 18:52:34 GMT

Korey Griffin at 18:51, 13 October 2008

Korey Griffin — Mon, 13 Oct 2008 18:51:13 GMT

←Older revision		Revision as of 18:51, 13 October 2008
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-	Antigen Retrieval is a proven and effective method for optimizing tissue antigen detection of formalin-fixed, paraffin-embedded tissue sections. Pretreatment with an antigen retrieval reagent (Antigen unmasking) that reverses protein cross-links formed by formalin fixation allows greater exposure for the antibody to associate with antigenic sites. There are heat-based (Microwave Oven, Pressure Cooker or Steamer/Roce Cooker) are the most commonly used heating devices. Certain antigenic determinants are masked by formalin fixation and paraffin embedding and may be exposed. Below are the most popular and effective methods from researchers performing these experiments.

		+
		+	Antigen Retrieval is a proven and effective method for optimizing tissue antigen detection of formalin-fixed, paraffin-embedded tissue sections. Pretreatment with an antigen retrieval reagent (Antigen unmasking) that reverses protein cross-links formed by formalin fixation allows greater exposure for the antibody to associate with antigenic sites. There are heat-based (Microwave Oven, Pressure Cooker or Steamer/Roce Cooker) are the most commonly used heating devices. Certain antigenic determinants are masked by formalin fixation and paraffin embedding and may be exposed. Below are the most popular and effective methods from researchers performing these experiments.

	==Heat Treatment==		==Heat Treatment==

-	10-20 minute heat treatment is a common range that is widely effective. The cooling process taking ~20 minutes. The main mechanism of heat-induced antigen retrieval is disruption of the cross-links and pH is also an essential factor for proper refolding of epitopes. For this reason a low pH and high pH buffer is a good contrast in optimizing the staining protocol. Below are 3 options to consider;	+	10-20 minute heat treatment is a common range that is widely effective. The cooling process taking ~20 minutes. The main mechanism of heat-induced antigen retrieval is disruption of the cross-links and pH is also an essential factor for proper refolding of epitopes. For this reason a low pH and high pH buffer is a good contrast in optimizing the staining protocol.
		+
		+	1) Temperature of retrieval solution should be around 95 °C.
		+
		+	2) Incubation time should be at least 10 minutes and it is usually around 20 minutes.
		+
		+	3) pH value of retrieval solution is depending on which solution you are using.
		+
		+	Below are 3 options to consider;

	*'''OPTION 1:''' 10 mM sodium citrate buffer, pH 6.0.		*'''OPTION 1:''' 10 mM sodium citrate buffer, pH 6.0.
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	==Enzymatic Treatment==		==Enzymatic Treatment==
		+
		+	1) Concentration of enzyme is usually 0.05-0.1% depending on type of tissue and fixation.
		+
		+	2) Incubation time could be 5-30 minutes and 10-15 minutes is commonly used.
		+
		+	3) Incubation temperature is usually at 37 °C.

	*Trypsin: Incubate sections for 10–20 minutes in 0.1% Trypsin PBS at room temperature. Wash slides several times in deionized H2O. Aspirate excess liquid from slides.		*Trypsin: Incubate sections for 10–20 minutes in 0.1% Trypsin PBS at room temperature. Wash slides several times in deionized H2O. Aspirate excess liquid from slides.

Korey Griffin at 22:41, 6 October 2008

Korey Griffin — Mon, 06 Oct 2008 22:41:47 GMT

←Older revision		Revision as of 22:41, 6 October 2008
Line 1:		Line 1:
	Antigen Retrieval is a proven and effective method for optimizing tissue antigen detection of formalin-fixed, paraffin-embedded tissue sections. Pretreatment with an antigen retrieval reagent (Antigen unmasking) that reverses protein cross-links formed by formalin fixation allows greater exposure for the antibody to associate with antigenic sites. There are heat-based (Microwave Oven, Pressure Cooker or Steamer/Roce Cooker) are the most commonly used heating devices. Certain antigenic determinants are masked by formalin fixation and paraffin embedding and may be exposed. Below are the most popular and effective methods from researchers performing these experiments.		Antigen Retrieval is a proven and effective method for optimizing tissue antigen detection of formalin-fixed, paraffin-embedded tissue sections. Pretreatment with an antigen retrieval reagent (Antigen unmasking) that reverses protein cross-links formed by formalin fixation allows greater exposure for the antibody to associate with antigenic sites. There are heat-based (Microwave Oven, Pressure Cooker or Steamer/Roce Cooker) are the most commonly used heating devices. Certain antigenic determinants are masked by formalin fixation and paraffin embedding and may be exposed. Below are the most popular and effective methods from researchers performing these experiments.
		+

	==Heat Treatment==		==Heat Treatment==

←Older revision		Revision as of 18:52, 13 October 2008
Line 1:		Line 1:
-
-
	Antigen Retrieval is a proven and effective method for optimizing tissue antigen detection of formalin-fixed, paraffin-embedded tissue sections. Pretreatment with an antigen retrieval reagent (Antigen unmasking) that reverses protein cross-links formed by formalin fixation allows greater exposure for the antibody to associate with antigenic sites. There are heat-based (Microwave Oven, Pressure Cooker or Steamer/Roce Cooker) are the most commonly used heating devices. Certain antigenic determinants are masked by formalin fixation and paraffin embedding and may be exposed. Below are the most popular and effective methods from researchers performing these experiments.		Antigen Retrieval is a proven and effective method for optimizing tissue antigen detection of formalin-fixed, paraffin-embedded tissue sections. Pretreatment with an antigen retrieval reagent (Antigen unmasking) that reverses protein cross-links formed by formalin fixation allows greater exposure for the antibody to associate with antigenic sites. There are heat-based (Microwave Oven, Pressure Cooker or Steamer/Roce Cooker) are the most commonly used heating devices. Certain antigenic determinants are masked by formalin fixation and paraffin embedding and may be exposed. Below are the most popular and effective methods from researchers performing these experiments.

Line 15:		Line 13:
	Below are 3 options to consider;		Below are 3 options to consider;

-	*'''OPTION 1:''' 10 mM sodium citrate buffer, pH 6.0.	+	'''OPTION 1:''' 10 mM sodium citrate buffer, pH 6.0.

-	*'''OPTION 2:''' 50 mM glycine-HCl buffer, pH 3.5, with 0.01% (w/v) EDTA.	+	'''OPTION 2:''' 50 mM glycine-HCl buffer, pH 3.5, with 0.01% (w/v) EDTA.

	'''Summary:''' Heat at 95º C for 5 minutes. Top off with fresh buffer and heat at 95º C for 5 minutes (optimal incubation time may vary for each tissue type). Allow slides to cool in the buffer for approximately 20 minutes. Wash in deionized H2O three times for 2 minutes each. Aspirate excess liquid from slides.		'''Summary:''' Heat at 95º C for 5 minutes. Top off with fresh buffer and heat at 95º C for 5 minutes (optimal incubation time may vary for each tissue type). Allow slides to cool in the buffer for approximately 20 minutes. Wash in deionized H2O three times for 2 minutes each. Aspirate excess liquid from slides.
Line 38:		Line 36:
	blocking and antibody staining.		blocking and antibody staining.

-	*'''OPTION 3:''' 0.05% citraconic anhydride solution, pH 7.4	+	'''OPTION 3:''' 0.05% citraconic anhydride solution, pH 7.4

	Formaldehyde reacts predominantly with the lysyl residues and forms intramolecular cross-links. Citraconic anhydride reacts with the free amino groups of proteins and replaces the positively charged NH3 groups of lysyl residues with negatively charged carboxyl groups. Citraconic anhydride solution efficiently releases formaldehyde cross-links. Heat deparaffinized formalin fixed tissue sections in 0.05% citraconic anhydride solution, pH 7.4, at 98C for 45 min., followed by 3 wash steps.		Formaldehyde reacts predominantly with the lysyl residues and forms intramolecular cross-links. Citraconic anhydride reacts with the free amino groups of proteins and replaces the positively charged NH3 groups of lysyl residues with negatively charged carboxyl groups. Citraconic anhydride solution efficiently releases formaldehyde cross-links. Heat deparaffinized formalin fixed tissue sections in 0.05% citraconic anhydride solution, pH 7.4, at 98C for 45 min., followed by 3 wash steps.
Line 55:		Line 53:
	3) Incubation temperature is usually at 37 °C.		3) Incubation temperature is usually at 37 °C.

-	*Trypsin: Incubate sections for 10–20 minutes in 0.1% Trypsin PBS at room temperature. Wash slides several times in deionized H2O. Aspirate excess liquid from slides.	+	*Trypsin Antigen Retrieval: Incubate sections for 10–20 minutes in 0.1% Trypsin PBS at room temperature. Wash slides several times in deionized H2O. Aspirate excess liquid from slides.

-	*Pepsin: Incubate sections for 10–20 minutes in 0.1% pepsin in 0.01 N HCl at room temperature. Wash slides several times in deionized H2O. Aspirate excess liquid from slides.	+	*Pepsin Antigen Retrieval: Incubate sections for 10–20 minutes in 0.1% pepsin in 0.01 N HCl at room temperature. Wash slides several times in deionized H2O. Aspirate excess liquid from slides.

	==Detergent Treatment==		==Detergent Treatment==

	*Saponin: Incubate sections for 30 minutes in 0.05% saponin in deionized H2O at room temperature. Wash at least three times in PBS. Aspirate excess liquid from slides.		*Saponin: Incubate sections for 30 minutes in 0.05% saponin in deionized H2O at room temperature. Wash at least three times in PBS. Aspirate excess liquid from slides.