Intended Use
For In Vitro Diagnostic Use
Summary and Explanation
CD34 functions as a cell-cell adhesion factor and cell-surface glycoprotein. It may also mediate the attachment of stem cells to bone marrow extracellular matrixes or directly to stromal cells. Cells expressing CD34 are normally found in the umbilical cord and bonemarrow as hematopoietic cells, and in vascular endothelium. In addition to stem cell recognition, CD34 is expressed by vascular endothelium; it appears that proliferating endothelial cells express this molecule in greater amounts than resting cells. In comparison to factor VIII R Antigen, CD34 stains are stronger and appear to be more sensitive in nature.
In tumors, CD34 is found in Alveolar Soft Part Sarcoma, pre B-ALL (positive in 75%), AML(40%), AMLM7 (most), Dermatofibrosarcoma Protuberans, Gastrointestinal Stromal Tumors, Giant Cell Fibroblastoma, Granulocytic Sarcoma, Kaposi’s Sarcoma, Liposarcoma, Malignant Fibrous Histiocytoma, Malignant Peripheral Nerve Sheath tumors, Meningeal Hemangiopericytomas, Meningiomas, Neurofibromas, Schwannomas, and Papillary Thyroid Carcinoma. A negative CD34 may exclude Ewing’s Sarcoma/PNET, Myofibrosarcoma of the breast, and Inflammatory Myofibroblastic tumors of the stomach.
Presentation
Anti – CD34 is a mouse monoclonal antibody derived from cell culture supernatant that is concentrated, dialyzed, filter sterilized and diluted in buffer pH 7.5, containing BSA and sodium azide as a preservative.
Mohs IHC Procedure
Specimen Preparation of Mohs Frozen Tissues
- Embed the specimen in OCT inside a cryostat.
- Cut sections at 4-5 µm and mount on a positively charged glass slide such as the Bio SB Hydrophilic Plus Slides (BSB 7028) or in the lower third of the TintoDetector Cap Gap slides (BSB 7006).
- Air dry the slide at room temperature for 2 minutes and then incubate the slide at 60 °C for 3 minutes in an incubator or dry bath.
- Fix in 100% acetone for 2 minutes at room temperature.
Pretreatment of Mohs Frozen Tissues
- Preheat the TintoDetector Incubator to 110°C.
- Place TintoDetector Cap Gap slides (BSB 7006) face to face and insert them into the TintoDetector Slide Holder (BSB 7003).
- Submerge slides in ImmunoDNA Retriever with EDTA to draw up enough solution by capillary action to cover the tissues.
- Heat the slides in a preheated TintoDetector Incubator for 3 minutes.
- Transfer slides to room temperature and cool off for 1 min.
Mohs IHC Detection
- After HIER, transfer slides to ImmunoDNA washer and let it stand for 1-2 minutes.
- For manual staining, perform antibody incubation at ambient temperature. For automated staining methods, perform antibody incubation according to instrument manufacturer’s instructions.
- Wash slides with ImmunoDNA washer or DI water.
- Continue IHC detection protocol. Wash slides between each step with ImmunoDNA washer solution.
Abbreviated Mohs PolyDetector Plus DAB HRP Brown or HRP Green Immunohistochemical Protocol
- Incubate with Primary Antibody for 5 min
- Wash with Buffer (TBST or PBST)
- Incubate with M/R link for 4 min
- Wash with Buffer (TBST or PBST)
- HRP Label for 4 min.
- Wash with Buffer (TBST or PBST)
- Prepare
- DAB Brown (1 drop of DAB Chromogen in 1ml of DAB Buffer; mix well)
- or HRP Green (1 drop of HRP Green Chromogen in 1 ml of HRP Green Buffer; mix well)
- Incubate with DAB or HRP Green for 1-2 min
- Wash with Buffer (TBST or PBST)
- Counterstain with Hematoxylin or Nuclear Fast Red for 30 seconds
- Wash with Buffer (TBST or PBST)
- Mount with AquaMounter or dehydrate the tissue with Fast ChromoProtector then mount with PermaMounter
Step
|
Mohs PolyDetector Plus HRP Green or DAB 20 Minute Protocol |
| HIER |
3 min. |
| Primary Antibody |
5 min. |
| 1st Step Detection |
4 min. |
| 2nd Step Detection |
4 min. |
| Substrate-Chromogen |
1-2 min. |
| Counterstain / Coverslip |
Varies |
This protocol can also be used with FFPE tissues retrieved with Citrate or EDTA.
