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Special Stain

Special Stain. Cytochemical Reactions in Acute Leukemia. Leukocyte Alkaline phosphatase (LAP):. Purpose: Distinguishing the cells of leukemoid reactions with increase activity from these of (CML) with decreased activity.

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Special Stain

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  1. Special Stain

  2. Cytochemical Reactions in Acute Leukemia

  3. Leukocyte Alkaline phosphatase (LAP): • Purpose: Distinguishing the cells of leukemoid reactions with increase activity from these of (CML) with decreased activity. • Principle: Alkaline phosphatase Activity is present in varying degrees in the neutrophil and band form of the granulocytes /some times in B lymphocytes

  4. Leukocyte Alkaline phosphatase (LAP) Negative LAP reaction Positive LAP reaction

  5. 1-Leukocyte Alkaline phosphatase (LAP): • Interpretation: • Count 100 neutrophils and score them (0/+4), then calculate the final score by adding the total scores. • Grading: • *(0) No stain • *(+1) Faint stain • *(+2) Moderate stain • *(+3) Strong stain • *(+4) Strong stain without cytoplasmic background • Normal Range: 30-185

  6. **The following diseases will not affect LAP result: • Untreated hemolytic anemia. • Lymphosarcoma. • Viral hepatitis. • Secondary polycythemia.

  7. Peroxidase stain : • Purpose: To differentiate a myelogenous or monocytic leukemia from acute lymphocytic .leukemia • Principle: • Peroxidase is present in the primary azurophilic granules of neutrophil, eosinophil and monocyte & activity increased with maturation, no activity is found in red cells or lymphocytes.

  8. Myeloperoxidase (MPO) red brown precipitate Bluish-black granules

  9. Myeloperoxidase stain, bone marrow aspirate The red granular staining peroxidase activity.

  10. Peroxidase stain : • Red – brown peroxidase found in: neutrophil and eosinophil {promyelocyte – Myelocyte – Metamyelocyte} • Finely granular staining found in: - Monocyte • Negative stain found in: ( early Myeloblast, lymphblast, basophiles and plasma cell)

  11. Notes: • In acute leukemia, infection & myelodysplasia neutrophils show (-ve) stain • Increase in CML* • Basophile May stain +ve in granulocytic leukemia • Peroxidase stain show results similar to those of sudan Black B stain

  12. Sudan Black B: • Purpose: To distinguish acute myelogenous and monocytic leukemia from lymphocytic leukemia. • Principle: Sudan black B dye is fat soluble, then it stains fat particles (Steroles, phospholipids and neutral fats) which present in the primary and secondery granules of myelocytic and monocytic cells.

  13. Sudan Black B • Positive sudan black B (SBB) stain in a patient with AML , • Not the black staining cytoplasmic granules in the myeloblasts

  14. Interpretation: • Myelogenous cells show coarse staining granules with faint staining pattern for myelobast and increase staining with maturation. • Auer rods are +vely stained. • Monocytic cells show finely scatterd granules. • -ve lymphoctic staining except Burkitt`s lymphoma cells, may show +ve staining vacuoles.

  15. Non Specific Esterase: {with fluoride inhibition} • Purpose: Differentiate myelocytic and monocytic leukemia. • Principle: WBCS contain esterases, a group of lysosomal enzymes

  16. Non Specific Esterase: {with fluoride inhibition} NSEs α-naphthyl acetate positivity in M5b. Not the granular positivity in the monoblasts and immature monocytes

  17. Interpretation • (+ve) brick – red staining which found in: Megakaryocyte and platelets, Histocyte, Macrophage, Monocyte & Lymphoblast of ALL • (-ve) for granulocytes • **If fluoride added, only monocyte non specific esterase will be inhabited.

  18. Specific esterase or chloroacetate • Principle: Interpretation: • Myeloid cells (+ve) • Monocyte and basophile (–ve) to weak (+ve) • Other cells {lymph – plasma –megakaryocyte – nrbc } (-ve) • Auer rods (+ve)

  19. Specific esterase or chloroacetate • Naphthol (AS-D) Chloroacetate Esterase stain in a patient with AML,M2. Not the bright red staining indicating that these two blasts are of myeloid origin.

  20. Periodic Acid – Schiff [PAS] Reaction: • Purpose: • Diagnosis of some acute lymphocytic leukemia • subtypes of AML • M 6 • Principle: the stain indicates the presence of muccoproteins , glycoproteins and high molecular weight carbohydrates in blood cells.

  21. Periodic Acid – Schiff [PAS] Reaction Giant multinucleate late normoblasts (left). Granular PAS positivity in proerythroblasts and homogeneous positivity in the later normoblasts

  22. PAS positivity in M6. Not the intense staining of the large abnormal erythroblast. Positive PAS stain in ALL

  23. Acid phosphatase ( with tartrate resistance) • Purpose: diagnosis of hairy cell leukemia. • Principle: ACP enzyme present in myelocytic, lymphocytes, monocytic, plasma cell, and platelets in these cells ACP activity will inhibited in the presence of (L-tartarate) and give no color, while hairy cell ACP will not inhibited and give (+ve).

  24. Acid phosphatase ( with tartrate resistance) • Hairy cell leukemia, TRAP stain. Acid phosphatase reaction after incubation with tartaric acid. Granular staining is seen in the lymphocytes.

  25. Iron stain (Prussian Blue Reaction): • Principle: • Sidrotic granules are found in the cytoplasm of developing cells in [BM] in the form of Ferric [Fe+3]. • Perls' reagent is formed of (Potassium Ferricyanide + HCL) • Sidrotic granules are found in nRBCs, some reticulocytes

  26. Sidrotic granules are found in nRBCs, some reticulocytes

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