Download Special Stain

Cytochemical Reactions in Acute Leukemia
Cytochemical
Reaction
Cellular Element
Stained
Myeloperoxidase
(MPO)
Neutrophil primary Myeloblasts strong positive;
granules
monoblasts faint positive
Sudan Black B (SBB)
Phospholipids
Myeloblasts strong positive;
monoblasts faint positive
Specific esterase
Cellular enzyme
Myeloblasts strong positive
Nonspecific esterase
(NSE)
Cellular enzyme
Monoblasts strong positive
Glycogen and
related substances
Variable, coarse or block-like
positivity often seen in
lymphoblasts and
pronormoblasts, myeloblasts
usually
negative although faint diffuse
reaction may
occasionally be seen
Periodic acid-Schiff
Blasts Identified
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
Leukocyte Alkaline phosphatase (LAP)
Negative LAP reaction
Positive LAP reaction
1-Leukocyte Alkaline phosphatase (LAP):
 Interpretation:
 Count 100 neutrophils and score them (0/+4), then
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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
LAP elevated in:
LAP decreased in:
Leukomoid reaction.
CML.
Pregnancy
Paroxymal Nocturnal
Hemoglobinuria.
Polycythemia vera.
Sickle cell anemia.
Aplastic anemia.
Hypophosphatasia.
Multiuple myeloma
Obstructive juindice.
Hodgkins` disease.
**The following diseases will not affect LAP result:
1.
2.
3.
4.
Untreated hemolytic anemia.
Lymphosarcoma.
Viral hepatitis.
Secondary polycythemia.
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.
Myeloperoxidase (MPO)
Bluish-black granules
red brown precipitate
Myeloperoxidase stain, bone marrow aspirate
The red granular staining
peroxidase activity.
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)
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
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.
Sudan Black B
 Positive sudan
black B (SBB) stain
in a patient with
AML ,
 Not the black
staining cytoplasmic
granules in the
myeloblasts
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.
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).
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.
Non Specific Esterase:
{with fluoride inhibition}
 Purpose: Differentiate myelocytic and monocytic
leukemia.
 Principle: WBCS contain esterases, a group of
lysosomal enzymes
Non Specific Esterase: {with fluoride
inhibition}
NSEs α-naphthyl acetate positivity in M5b.
Not the granular positivity in the monoblasts
and immature monocytes
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.
Periodic Acid – Schiff [PAS]
Reaction:
 Purpose:
 Diagnosis of some acute lymphocytic leukemia
 subtypes of AML
 M6
 Principle: the stain indicates the presence of
muccoproteins , glycoproteins and high molecular
weight carbohydrates in blood cells.
Periodic Acid – Schiff [PAS] Reaction
Giant multinucleate late normoblasts
(left). Granular PAS positivity in
proerythroblasts and homogeneous
positivity in the later normoblasts
Interpretation:
 Normally all blood cells are (+ve) but Erythroblasts (-ve)
 Diffused stain pattern (Granulocytes)
 Granular stain (lymphocytes and monocytes)
 Plts deeply stained
 nRBCs (-ve) stain
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In diseases:
 In CML, lymphosarcoma and Hodgkins` disease (+ve) staining
granules will increase.
 nRBCs in M6, thalassemia and other types of anemia may give
[+ve] reaction.
Positive PAS stain
acute megakaryocytic
leukemia AML, M7.
Positive PAS stain in ALL
PAS positivity in M6. Not the
intense staining of the large
abnormal erythroblast.
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)
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.
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
reticulocytes
are
found
in
nRBCs,
some
Sidrotic granules are found in nRBCs, some
reticulocytes