Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound   Target Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound

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Query: EC:1.11.1.7 (peroxidase)
65,474 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Between 1983-1988 bone marrow samples obtained from 195 peroxidase-negative leukemia patients were analyzed for their surface antigens. Thirteen of these patients (6.7%) had myelomonocytic-positive and lymphoid-negative antigens. These leukemic cells reacted with CD13 in eight patients, CD33 in seven, CD11 in six and CDw41 in two. In none of these patients did the leukemic cells react with CD1, CD2, CD3, CD4, CD5, CD8, CD10, CD19 or CD20. Leukemic cells from two patients were reactive with CD7. These leukemic cells demonstrated L2 morphology in 11 patients and L1 morphology in one patient. The leukemic cells from the final patient were diagnosed as those of leukemic transformation of myelodysplastic syndrome. Chromosomal abnormality was observed in approximately half of the patients examined (6/10). Cytochemical analysis revealed that the leukemic cells were negative for periodic acid Schiff stain but positive for acid phosphatase. The prognosis of these patients was markedly poor as compared to acute lymphocytic leukemia or typical peroxidase-positive nonlymphocytic leukemia. Complete remission was induced in only 30% of patients and duration of survival was short (4.7 months). This suggests that myelomonocytic antigen-positive peroxidase-negative acute leukemia is a distinct type of leukemia and may require more aggressive therapy to improve survival.
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PMID:Peroxidase-negative and myelomonocytic antigen-positive acute leukemia. 132 47

We recently encountered a patient with acute lymphoblastic leukemia (ALL) who showed temporal monocytosis of an unusually high cell count (5,000-30,000 monocytoid cells/microliter) five times after treatment with different chemotherapies. The leukemic cells expressed B-cell-associated antigens, CD19 and CD10, E-rosette receptor, CD2 and monocyte/myeloid antigen, CD13 simultaneously. They were peroxidase-negative. One week after the initiation of conventional chemotherapy for ALL, the leukemic blasts had disappeared. Alternatively, monocytoid cells appeared along with the recovery from nadir status. They showed several features of monocytes; they were weakly dot-positive for nonspecific esterase, reactive with CD14 and CD13 and Fc gamma-receptor-positive. Furthermore, they migrated into a fungally infected joint space. Features incompatible with normal monocytes were the absence of peroxidase reactivity, the expression of B-cell-associated antigens, CD19 and CD10 and E-rosette receptor, CD2. Southern blot hybridization analysis revealed an unexpected result that HindIII digested DNA from both leukemic blasts and monocytoid cells had the same rearranged band of IgH. Thus, an identical clonality of monocytoid cells, temporally appearing after chemotherapies and leukemic lymphoblasts, was determined in this patient with CD13+ ALL.
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PMID:Monocytes appearing repeatedly after chemotherapies had an identical rearrangement pattern of immunoglobulin with leukemic blasts in a patient with CD13+ acute lymphoblastic leukemia. 135 Jan 59

We herein describe an unusual case of acute myeloid leukaemia (AML) showing strong cytochemical reactivity for myeloperoxidase (MPO) but surprisingly no reactivity using flow cytometry for any of the lineage-specific cell surface markers, i.e. myelomonocytic antigens CD13, CD14 and CD33; or B-lymphoid antigens CD19, CD20 and immunoglobulins; or T-lymphoid antigens CD2, CD3 and CD5. The strong reactivity for MPO and the complete absence of reactivity for CD13 and CD14 was verified by an independent assay involving alkaline phosphatase-anti-alkaline phosphatase (APAAP). Our case is of interest for at least two reasons: First, a poorly differentiated variant of AML (negative for MPO but positive for one or more of the myeloid-lineage CD antigens) has been designated FAB M0. In terms of the expression of phenotypic markers, our case may be considered as an 'MPO (+), CD antigen (-) AML'. The CD antigens are known to be expressed very early during myeloid differentiation whereas MPO (in its functional form) is viewed as being expressed relatively late in the process. It is therefore intriguing from a biological standpoint why the supposedly early antigens (CD33 and CD13) remain unexpressed; this may represent an example of 'asynchronous differentiation' in leukaemia. Second, from a practical standpoint, the use of immunophenotyping as a first-line diagnosis would fail to detect such cases. This case strengthens the notion that immunophenotyping by flow cytometry does not eliminate the necessity of performing peroxidase cytochemical staining.
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PMID:Acute myeloid leukaemia with an unusual phenotype: myeloperoxidase (+), CD13 (-), CD14 (-) and CD33 (-). 138 46

Two continuously growing cell lines, designated YOS-M and YOS-B, were established simultaneously from a patient with Philadelphia (Ph1) chromosome-positive chronic myelogenous leukaemia (CML) in myeloid blast crisis. Both YOS-M and YOS-B had the Ph1 chromosome and identical additional chromosome abnormalities, which were not detected in the chronic phase. Cytochemical analysis showed that YOS-M was significantly positive for peroxidase, whereas YOS-B was entirely negative. YOS-M expressed myeloid-associated antigens (CD14, CD33) as well as CD4, CD25 and CD34. The surface phenotype of YOS-M was identical to that of the leukaemic blasts found in the patient. On the other hand, YOS-B expressed mature B-cell markers, CD19, CD20, CD21 and surface immunoglobulin, but not myeloid-associated antigens. These two cell lines showed an identical rearrangement pattern of the break point cluster region on chromosome 22, but rearrangement of the immunoglobulin heavy chain gene was detected only in YOS-B. These findings provide definite evidence that CML cells still have the capability to differentiate and mature along different haematopoietic cell lineages even after blast crisis.
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PMID:Simultaneous establishment of myeloid and B-lymphoid cell lines with identical chromosome abnormalities from Philadelphia chromosome-positive chronic myelogenous leukaemia. 148 31

The diagnosis of acute undifferentiated leukemia (AUL) is made when the leukemic cells do not have cytologic or cytochemical features of myeloid cells, and do not express myeloid antigens (CD13, CD14, CD33, CD41 etc.) or lymphoid antigens (CD2, CD3, CD19, CD20, Sm Ig etc.). Most of these cells are reported to be positive for CD7, CD34, TdT and HLA-DR, either alone or in combination. Cell lineage can be suspected in most AUL cells by genotypic analysis, phenotypic analysis after culturing with TPA, or peroxidase activity by ultrastructural or immunohistochemical analysis, which indicates the heterogeneity of AUL. The patients with AUL appear to have a poor prognosis with conventional chemotherapy.
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PMID:[Immunophenotyping analysis of acute undifferentiated leukemia]. 151 41

A 61-year-old man was admitted to our hospital in April 18, 1988, with dyspnea and gingival bleeding. Physical examination revealed marked splenomegaly, and peripheral blood showed severe pancytopenia with 38% abnormal mononuclear cells. The abnormal cells were characterized by a hairy appearance under a phase contrast microscopy, and strong tartrate-resistant acid phosphatase activity. These cells reacted with CD19, CD25 and CD11c monoclonal antibodies by the immunostaining method. Bone marrow aspiration failed and bone marrow biopsy revealed diffuse proliferation of hairy cells (HC) with moderate fibrosis. In addition, the staining pattern of HC peroxidase is similar to that found in megakaryocyte series. He was diagnosed as HCL of the European-American type based on these findings. Interferon (IFN)-alpha was administered at a daily dosage of 3 x 10(6) IU by intramuscular injection. Although splenomegaly and hematological conditions improved gradually, he received splenectomy because of his incomplete hematological improvement. Normalization of peripheral blood cell counts and a marked decrease of HC in bone marrow were obtained. Tubuloreticular structure and tubular confronting cisternae were seen in peripheral mononuclear cells during IFN therapy.
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PMID:[Improvement with interferon-alpha therapy and splenectomy in hairy cell leukemia of European-American type]. 157 41

Immunophenotypic analysis of acute leukemias is time consuming and often requires flow cytometric analysis. A 1-hour alkaline phosphatase-labeled streptavidin-biotin immunocytochemical procedure was evaluated as an alternative. Seventeen cases of acute leukemia, including 10 acute lymphocytic (ALL) and 7 acute nonlymphocytic, were phenotyped by the rapid immunocytochemical procedure and the results were compared with standard analyses. In all 17 cases, the diagnoses made using standard cytochemical and immunologic methods were the same as obtained in blinded reviews by rapid immunocytochemical analysis. Nine cases of precursor B-cell ALL were positive for CD19 and/or CD22. Five CD19 + cases of ALL reacted with anti-myeloperoxidase, with one case also positive for CD15. CD15 positivity was confirmed on repeated study as well as with plastic section immunoperoxidase staining. Nine cases of ALL were positive for CD10 and eight were positive for terminal deoxynucleotidyl transferase. One case of ALL marked as T-cell ALL with CD1, CD2, CD3, and CD7. All cases of acute nonlymphocytic leukemia were positive for CD15, CD13, and/or CD33; anti-myeloperoxidase was positive in all but one case of monocytic leukemia. All cases of acute nonlymphocytic leukemia were negative for CD10 and one was positive for terminal deoxynucleotidyl transferase. Acute leukemias apparently may be phenotyped easily and accurately in 1 hour with this immunocytochemical technique, and slides may be stored permanently for review. There was in these 17 cases high correlation of the diagnoses with standard flow cytometric and cytochemical results. This rapid method allows a coordinated evaluation of morphologic features and immunophenotype; the latter features facilitated confirmation of unexpected reactivity of myeloid markers CD15 and MPO-7 in some cases of ALL.
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PMID:Rapid immunocytochemical analysis of acute leukemias. 159 10

A 63 year-old woman was referred to our hospital because of fever and increased number of blasts in the bone marrow. On physical examination she had slight hepatomegaly but no splenomegaly. Laboratory tests disclosed a hemoglobin level of 8.5 g/dl; a WBC count of 13,200/microliter with 26% blasts; a platelet count of 51,000/microliter. A bone marrow aspirate was normocellular with 74% blasts and 37% blasts were stained positive for myeloperoxidase. Cell surface markers for HLA-DR, CD10, CD19, CD13, CD33 were positive. Karyotype analysis revealed 46, XX, t (9q+; 22q-) and 45XX, -7, t (9q+; 22q-). Southern analysis showed rearrangement of immunoglobulin heavy chain but not T cell receptor beta gene. Rearrangements in M-BCR were not detected with 5' or 3' bcr probes. After 2 courses of chemotherapy, blasts decreased to 7% with recovery of normal elements and 11 out of 20 metaphases of the bone marrow cells were normal karyotype. These findings suggest that this case was de novo Ph1 positive acute leukemia which demonstrated both lymphoid and myeloid features.
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PMID:[Biphenotypic acute leukemia with Ph1 chromosome, M-BCR-, myeloperoxidase+, and CALLA+]. 164 7

Tissue lesions from eight patients with recurrent oral ulcers (ROU) were subjected to detailed immunohistopathologic studies. In five patients, a specimen of an unaffected area from the opposite site was obtained. The main inflammatory cells in situ were CD3 positive T lymphocytes, with CD4 cells forming approximately half (range 30-60%) and CD8 cells 20% (range 10-30%) of all cells. CD19 positive B lymphocytes formed 5-12% of all cells. Furthermore, 45% (range 15-65%) of all lymphoid cells had signs of previous antigenous contact and had helper/inducer CDw29 type. Suppressor/inducer CD45R cells formed only about 20% (range 7-50%) of all cells. Although this observation suggests involvement of antigen as a causative and/or triggering stimulus, elements of a non-specific inflammatory response were observed as well. Endogenous peroxidase-positive neutrophils were present at the ulcer site, and were occasionally observed intravascularly and in the extracellular matrix in areas characterized by inflammatory mononuclear cell infiltrates. Although the proportion of endogenous peroxidase-positive, recently recruited monocytes was low, CD11b and nonspecific esterase-positive mature tissue macrophages formed about 14% (range 5-35%) of all inflammatory cells in situ, particularly at the periphery of the lymphoid cell infiltrates. Mast cells were also observed in all samples studied, forming 2-5% of inflammatory cells in the richly vascularized connective tissue beneath the basement membrane. In the specimens from clinically unaffected areas, inflammatory cells were rare. Our observations stress the multifaceted nature and participation of multiple effector systems in the local tissue pathogenesis of ROU.
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PMID:Immune-inflammatory cells in recurrent oral ulcers (ROU). 168 77

We present a case of acute lymphoblastic leukemia (ALL) in which the leukemic cells had cytoplasmic azurophilic granules. Surface marker studies revealed that the leukemic cells expressed CD10 (CALLA), CD19, CD20, and HLA-DR antigens. Cytochemical studies by light microscopy revealed that the blasts were negative for myeloperoxidase, PAS staining, and double esterase staining, supporting the diagnosis of ALL. However, an ultrastructural study demonstrated that some of the cytoplasmic granules were myeloperoxidase (MPO) positive. Our findings suggested that leukemic transformation in this case may have taken place at a stage ontogenetically close to the pluripotent stem cell. Furthermore, the present case indicates the existence of a new form of ALL is characterized by MPO-positive granules detectable by ultracytochemistry and lymphoid-associated surface markers.
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PMID:Acute lymphoblastic leukemia with azurophilic granules that contain ultrastructural myeloperoxidase activity. 170 29


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