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Mouse monoclonal antibody against MSH2 (Clone ISM061)

Mouse monoclonal antibody against MSH2 (Clone ISM061)

Product identification

 

ISC092-R3                    3 ml ready-to-use (RTU)

ISC092-R7                    7 ml ready-to-use (RTU)

ISC092-C02                  0.2 ml concentrated

ISC092-C05                  0.5 ml concentrated

Summary and explanation

Mismatch repair (MMR) proteins is a group of nuclear enzymes, which in all proliferating cells participate in repair of base-base mismatch, that occur during DNA replication. The proteins form complexes (heterodimers) that bind to areas of abnormal DNA and initiates its removal. Loss of MMR proteins leads to an accumulation of DNA replication errors in the proliferating cells, particularly in areas of the genome with short repetitive nucleotide sequences, a phenomenon known as microsatellite instability (MSI). Hence, MMR protein deficiency in cells is closely related to a high degree of MSI (MSI-H), in contrast to cells with a low degree of MSI (MSI-L) and cells that are MSI stable (MSS). In human, nine genes with MMR function have been identified, of which five have particular clinical interest because they may be mutated in families with hereditary non-polyposis colorectal cancer (HNPCC) (the relative frequency in parenthesis): MLH1 (49%), PMS1 (0.3%), PMS2 (2%), MSH2 (38%), and MSH6 (9%).

 

Principle of the procedure

The stated primary antibody is suitable for immunohistochemical staining of FFPE tissue sections based on specific antigen-antibody reaction. Using a detection system linked to HRP or alkaline phosphatase the antigen visualization is performed via specific binding of the primary antibody. Secondary antibody is binding to the primary antibody, and the enzyme complex labels this complex. The enzymatic activation of the chromogen results in a visible reaction product at the antigen site. Each step is incubated for a precise time and temperature and requires interposed washing steps. The specimen may then be counterstained. Results are interpreted using a light microscope.

Staining procedure

  1. Cut 3-4 μm section of formalin-fixed paraffin-embedded tissue and place on positively charged slides.
  2. Dry at 65°C for 2 hours.
  3. Deparaffinize, rehydrate, and epitope retrieve. Upon completion, rinse with 3 changes of distilled or deionized water.
  4. If using HRP detection system, place slides in peroxide block for 10 minutes; rinse. If using AP detection system, omit this step.
  5. Apply the antibody and incubate for 60 minutes; rinse.
  6. Apply the InSituVison™ Polymer Rabbit/Mouse Detection System for 30 minutes; rinse.
  7. Apply ample amount of DAB or AEC chromogen and incubate; rinse.
  8. Dehydrate and coverslip.

Interpretation of results

The immunostaining procedure causes a colored reaction product to precipitate at the antigen sites localized by the primary antibody.

 

Cellular localization: Cell nucleus.

 

A qualified pathologist experienced in immunohistochemistry procedures must evaluate positive and negative tissue controls before interpreting patient specimens.

Positive staining intensity should be assessed within the context of any background staining of the negative reagent control.

Note: A negative result means that the antigen in question was not detected, but not that the antigen is not present in the cells/tissues tested. An antibody panel may be used to support the results in some circumstances. Additionally, the morphology of each tissue sample should be examined utilizing a hematoxylin and eosin stained section. A qualified pathologist must interpret the patient’s morphologic findings and pertinent clinical data.

Warnings and precautions

  1. Application only by qualified and trained personnel.
  2. There are no estimated health risks, if the product is used as directed. MSDS is available on request.
  3. Product contains sodium azide as preservative. Pure sodium azide is toxic. The concentration of sodium azide in this reagent is < 0.1 % and is not classified hazardous.

See MSDS.

  1. As with any product derived from biological sources, proper handling procedures should be used.
  2. Do not use reagents after expiration date.
  3. Take reasonable precautions when handling reagents. Use protective clothing and gloves.
  4. All hazardous materials should be disposed according to guidelines for hazardous waste disposal. Materials of human or animal origin should be handled as biohazardous materials and disposed of with proper precautions.
  5. Avoid microbial contamination of reagents as it may cause incorrect results.

Materials provided

 

Primary antibody MSH2
Host Mouse
Subclass IgG
Clone ISM061
Species Cross-reactivity Human. Others-not known
Applications Immunohistochemistry
Epitope Retrieval Heat-induced epitope retrieval
Ready-to-use antibody Prediluted antibody in antibody diluent buffer
Recommended working dilution range 1:50 to 1:100

 

Product label shows the specific lot number.

 

Prediluted antibody is ready-to-use and optimized for staining. No further dilution, reconstitution, mixing, or titration is needed.

Antibody concentrate is optimized for dilution within dilution range using InSituChem® Antibody Diluent for IHC (Cat. No. D005-50). Indicated dilution range should be considered as recommendation and depends on different facts (tissue, fixation, incubation conditions, etc.). Optimum dilution to be determined in user’s own system.

Materials required but not provided

The following materials may be required for staining but are not provided with the primary antibody.

– Positive and negative controls

– Microscope slides (positively charged) and cover slips

– Water bath

– Humidified chamber

– Staining jars

– Stopwatch

– Xylene or xylene substitute

– Ethanol

– Deionized or distilled water

– Antigen retrieval reagent, e.g. Antigen Enhancer (HIER buffer), Cat. No. D004-500

– Detection system, e.g. IHC Complete Detection system (Goat anti mouse/rabbit HRP, DAB staining), Cat. No. D001-15

– Wash buffer: e.g. IHC Wash Buffer, Cat. No. D003-500

– Tap water/bluing reagent (e.g. ammonia water)

– Light microscope

Storage and handling

Store at 2 – 8 °C.

 

When stored correctly antibody is stable to the expiration date indicated on the vial. Do not use after expiration date.

To ensure proper reagent delivery and stability of the antibody, replace the dispenser cap after every use and immediately place the bottle cool in an upright position

Literature

[1] Stone J G, Robertson D, Houlston R S. Immunohistochemistry for MSH2 and MHL1: a method for identifying mismatch repair deficient colorectal cancer[J]. Journal of clinical pathology, 2001, 54(6): 484-487.

 

[2] Wahlberg S S, Schmeits J, Thomas G, et al. Evaluation of microsatellite instability and immunohistochemistry for the prediction of germ-line MSH2 and MLH1 mutations in hereditary nonpolyposis colon cancer families[J]. Cancer research, 2002, 62(12): 3485-3492.

Date of publication or revision

 

2024-06-10

Change(s) made

Explanation of symbols