Muscle Specific Actin (MSA)

Muscle Specific Actin (MSA)
Muscle Specific Actin (MSA)
Concentrated and Prediluted Monoclonal Antibody
Control Number: 901-079-102015
Catalog Number:
CM 079 A, B
PM 079 AA
IP 079 G10
OAI 079 T60
0.1, 0.5 ml, concentrated
6.0 ml, prediluted
10 ml, prediluted
60 tests, prediluted
Da Vinci Green
Intended Use:
For In Vitro Diagnostic Use
Muscle Specific Actin (MSA) [HHF35] is a mouse monoclonal antibody that is
intended for laboratory use in the qualitative identification of muscle actin protein by
immunohistochemistry (IHC) in formalin-fixed paraffin-embedded (FFPE) human
tissues. The clinical interpretation of any staining or its absence should be
complemented by morphological studies using proper controls and should be evaluated
within the context of the patient’s clinical history and other diagnostic tests by a
qualified pathologist.
Summary and Explanation:
The HHF-35 antibody recognizes muscle specific alpha and gamma actin isomers. It
does not react with non-muscle actin. It recognizes the alpha actin from cardiac,
skeletal and smooth muscle sources. It does not react with beta or nonsmooth muscle
gamma actin isomers. Studies have shown the antibody labels leiomyoma,
leiomyosarcoma and rhabdomyosarcoma. It does not label melanoma or lymphoma.
Principle of Procedure:
Antigen detection in tissues and cells is a multi-step immunohistochemical process.
The initial step binds the primary antibody to its specific epitope. A secondary antibody
may be applied to bind the primary antibody, followed by an enzyme labeled polymer;
or an enzyme labeled polymer may be applied directly to bind the primary antibody.
The detection of the bound primary antibody is evidenced by an enzyme-mediated
colorimetric reaction.
Source: Mouse monoclonal
Species Reactivity: Human; others not tested
Clone: HHF35
Isotype: IgG1/kappa
Total Protein Concentration: ~10 mg/ml. Call for lot specific Ig concentration.
Epitope/Antigen: Muscle actin
Cellular Localization: Cytoplasmic
Positive Tissue Control: Leiomyoma, leiomyosarcoma, muscle or prostate
Known Applications:
Immunohistochemistry (formalin-fixed paraffin-embedded tissues)
Supplied As: Buffer with protein carrier and preservative
Storage and Stability:
Store at 2ºC to 8ºC. Do not use after expiration date printed on vial. If reagents are
stored under conditions other than those specified in the package insert, they must be
verified by the user. Diluted reagents should be used promptly; any remaining reagent
should be stored at 2ºC to 8ºC.
Protocol Recommendations (intelliPATH and manual use):
Peroxide Block: Block for 5 minutes with Biocare's Peroxidazed 1.
Pretreatment Solution (recommended): Reveal
Pretreatment Protocol:
Heat Retrieval Method:
Retrieve sections under pressure using Biocare's Decloaking Chamber, followed by a
wash in distilled water; alternatively, steam tissue sections for 45-60 minutes. Allow
solution to cool for 10 minutes then wash in distilled water.
Protein Block: Incubate for 20 minutes at RT with Biocare's Background Punisher.
Primary Antibody: Incubate for 30 minutes at RT.
Probe: Incubate for 10 minutes at RT with a secondary probe.
Polymer: Incubate for 10-20 minutes at RT with a tertiary polymer.
Protocol Recommendations (intelliPATH and manual use) Cont'd:
Chromogen: Incubate for 5 minutes at RT with Biocare's DAB - OR - Incubate for 5-7
minutes at RT with Biocare's Warp Red.
Counterstain: Counterstain with hematoxylin. Rinse with deionized water. Apply
Tacha's Bluing Solution for 1 minute. Rinse with deionized water.
intelliPATH™ Automated Slide Stainer:
IP079 is intended for use on the intelliPATH™ Automated Slide Stainer. Refer to the
intelliPATH Automated Slide Stainer manual for specific instructions on its use. When
using the intelliPATH, peroxide block with intelliPATH Peroxidase Blocking Reagent
(IPB5000) may be performed following heat retrieval.
Protocol Recommendations (ONCORE Automated Slide Staining System):
OAI079 is intended for use with the ONCORE Automated Slide Staining System.
Refer to the ONCORE Automated Slide Staining System User Manual for specific
instructions on its use. Protocol parameters in the ONCORE Automated Slide Stainer
Protocol Editor should be programmed as follows:
Protocol Name: MSA
Protocol Template (Description): Ms HRP Template 1
Dewaxing (DS Option): DS2
Antigen Retrieval (AR Option): AR2, low pH; 25°C
Reagent Name, Time, Temp.: MSA, 30 min., 25°C
Technical Note:
This antibody has been optimized for use with Biocare's MACH 4 Universal HRPPolymer Detection, intelliPATH Universal HRP Detection Kit and ONCORE HRP
Detection. Use TBS for washing steps.
The optimum antibody dilution and protocols for a specific application can vary. These
include, but are not limited to: fixation, heat-retrieval method, incubation times, tissue
section thickness and detection kit used. Due to the superior sensitivity of these unique
reagents, the recommended incubation times and titers listed are not applicable to other
detection systems, as results may vary. The data sheet recommendations and protocols
are based on exclusive use of Biocare products. Ultimately, it is the responsibility of
the investigator to determine optimal conditions. The clinical interpretation of any
positive or negative staining should be evaluated within the context of clinical
presentation, morphology and other histopathological criteria by a qualified
pathologist. The clinical interpretation of any positive or negative staining should be
complemented by morphological studies using proper positive and negative internal
and external controls as well as other diagnostic tests.
Quality Control:
Refer to CLSI Quality Standards for Design and Implementation of
Immunohistochemistry Assays; Approved Guideline-Second edition (I/LA28-A2)
CLSI Wayne, PA USA ( 2011.
1. This antibody contains less than 0.1% sodium azide. Concentrations less than 0.1%
are not reportable hazardous materials according to U.S. 29 CFR 1910.1200, OSHA
Hazard communication and EC Directive 91/155/EC. Sodium azide (NaN3) used as a
preservative is toxic if ingested. Sodium azide may react with lead and copper
plumbing to form highly explosive metal azides. Upon disposal, flush with large
Page 1 of 2
Muscle Specific Actin (MSA)
Concentrated and Prediluted Monoclonal Antibody
Control Number: 901-079-102015
Precautions Cont'd:
volumes of water to prevent azide build-up in plumbing. (Center for Disease Control,
1976, National Institute of Occupational Safety and Health, 1976) (5)
2. Specimens, before and after fixation, and all materials exposed to them should be
handled as if capable of transmitting infection and disposed of with proper precautions.
Never pipette reagents by mouth and avoid contacting the skin and mucous membranes
with reagents and specimens. If reagents or specimens come in contact with sensitive
areas, wash with copious amounts of water. (6)
3. Microbial contamination of reagents may result in an increase in nonspecific
4. Incubation times or temperatures other than those specified may give erroneous
results. The user must validate any such change.
5. Do not use reagent after the expiration date printed on the vial.
6. The SDS is available upon request and is located at
Follow the antibody specific protocol recommendations according to data sheet
If atypical results occur, contact Biocare's Technical Support at
1. Rangdaeng S, Truong LD. Comparative immunohistochemical staining for desmin
and muscle-specific actin. A study of 576 cases. Am J Clin Pathol. 1991 Jul; 96 (1):32
2. Miettinen M. Antibody specific to muscle actins in the diagnosis and classification
of soft tissue tumors. Am J Pathol. 1988 Jan; 130 (1):205-15.
3. Tsukada T, et al. HHF35, a muscle actin-specific monoclonal antibody. II.
Reactivity in normal, reactive, and neoplastic human tissues. J Pathol. 1987 May; 127
4. Norton AJ, Thomas JA, Isaacson PG. Cytokeratin-specific monoclonal antibodies
are reactive with tumours of smooth muscle derivation. An immunocytochemical and
biochemical study using antibodies to intermediate filament cytoskeletal proteins.
Histopathology. 1987 May; 11 (5):487-99.
5. Center for Disease Control Manual. Guide: Safety Management, NO. CDC-22,
Atlanta, GA. April 30, 1976 "Decontamination of Laboratory Sink Drains to Remove
Azide Salts."
6. Clinical and Laboratory Standards Institute (CLSI). Protection of Laboratory
Workers from Occupationally Acquired Infections; Approved Guideline-Fourth Edition
CLSI document M29-A4 Wayne, PA 2014.
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