Search PubMed⌕ Search

Biomedical subjects

K Muroi

Publications and source records attributed to K Muroi.

At least 55 records · Page 3Linked to original sources
PubMed1995

Characterization of enriched CD34+ cells from healthy volunteers and those from patients treated with chemotherapy plus granulocyte colony-stimulating factor (G-CSF).

CD34+ cells were enriched, using a panning method, from peripheral blood (PB) and bone marrow (BM) of healthy volunteers and of patients treated with chemotherapy plus granulocyte colony-stimulating factor (G-CSF). In healthy volunteers, PB CD34+ cells expressed CD33 and CD13 at a higher frequency than BM CD34+ cells, and PB CD34+ cells contained a greater number of burst-forming units-erythroid (BFU-E) than colony-forming units granulocyte-macrophage (CFU-GM). Administration of G-CSF to healthy volunteers induced a marked increase in the number of PB CD34+ cells, although the proportions of those expressing CD33, CD13, and c-kit among these cells as well as colony-forming ability were not changed before and after G-CSF administration. There were no significant differences in surface antigens on PB CD34+ cells between healthy volunteers and patients after chemotherapy plus G-CSF, except for low expression of c-kit in the PB of patients. However, PB CD34+ cells from patients contained almost the same number of CFU-GM as BFU-E. These results indicate that there were clear differences in the features of CD34+ cells from BM and from PB, and between healthy volunteers and patients after chemotherapy plus G-CSF. Enriched CD34+ cells are useful for analyzing the characteristics of hematopoietic progenitor cells, and such analysis may predict the usefulness of autologous or allogeneic peripheral blood stem cell transplantation.

Adult↗
PubMed1995

Transformation into acute basophilic leukaemia in a patient with myelodysplastic syndrome.

We describe a patient with basophilic leukaemia following a 2-year period with myelodysplastic syndrome (refractory anaemia). The marrow showed 59.4% of blasts with 25.0% of mature and immature basophils. The leukaemic blasts contained granules, positively stained with toluidine blue but negative for peroxidase. The basophilic differentiation was confirmed by ultrastructural analysis demonstrating immature basophil granules. In addition, a morphological transition from immature blasts to more mature basophils was observed. Immunophenotypic analysis of blasts and basophils showed positive for CD5, CD7, CD13, CD33 and CD34. Cytogenetic investigation showed an abnormal karyotype, 46,XY,del(5)(q31q35), in 11% of the cells examined when the initial diagnosis of refractory anaemia was made. However, expansion of the same clone up to 100% was observed concomitantly with transformation to basophilic leukaemia.

Anemia, Refractory↗
PubMed1995

Methicillin-resistant Staphylococcus aureus: colonization and development of infection in patients with haematological disorders.

A retrospective study of 53 patients with haematological disorders whose bacterial cultures were positive for methicillin-resistant Staphylococcus aureus (MRSA), was performed to analyse the risk factors for MRSA infection, and the prognostic factors. Sixteen patients showed colonization by MRSA but never developed infection(C), 16 showed colonization and subsequent infection(C-I), while 21 had MRSA infection at the time of first culture (I). Poor performance status, thrombocytopenia, increased serum urea nitrogen and decreased serum cholinesterase were more prominent in (I) than (C) + (C-I). The risk factors associated with the development of infection from colonization were age and serum cholinesterase. In addition, lower respiratory tract infection as a type of infection, non-remission status of the haematological malignancy and an inappropriate antibiotic therapy were associated with a poor prognosis for MRSA infection.

Blood Urea Nitrogen↗
PubMed1995

Duocarmycins, potent antitumor antibiotics produced by Streptomyces sp. structures and chemistry.

Seven novel potent antitumor antibiotics, duocarmycins A (1), C1 (2), C2 (3), D (4), B1 (5), B2 (6) and SA (7), were isolated from three independently collected Streptomyces sp. The complete structures, including absolute stereochemistry, were determined by spectral and chemical studies of those duocarmycins and several derivatives. Duocarmycins A (1) and SA (7) possess a 1,2,7,7a-tetrahydrocycloprop[1,2-c]indol-4-one subunit, a common pharmacophore with that of CC-1065 (10) found from Streptomyces zelensis.

Alkylating Agents↗
PubMed1995

B-cell lymphoma terminating in acute monoblastic leukemia.

A case of CD11b-, CD14- and CD36-positive B-cell lymphoma terminating in acute monoblastic leukemia is presented. The patient was initially suspected as having angiotrophic lymphoma due to proliferation of lymphoma cells within the sinusoid of the liver and clinical signs. Following chemotherapy, the lymphoma cells were converted into CD11b- and CD36-positive monoblasts. Lineage switching of B-cell lymphoma to acute monoblastic leukemia may have occurred in this case.

Humans↗
PubMed1995

Acute graft-versus-host disease of the gut.

A 28-year-old man with acute promyelocytic leukemia at first early relapse received HLA-matched allogenic bone marrow transplantation (BMT) at first early relapse. Cyclosporin A and methotrexate were administered at conventional doses as a prophylaxis for graft-versus-host disease (GVHD). He presented with severe bloody diarrhea on day 87 after BMT. Examination of the lower gastrointestinal tract revealed diffuse mucosal change of inflammation. A diagnosis of late onset of acute gut GVHD was made, in the absence of other manifestations such as skin and liver involvement. A further survey is needed to clarify the incidence and the pathogenesis of atypical gut GVHD.

Acute Disease↗
PubMed1995

Expression of c-kit receptor (CD117) and CD34 in leukemic cells.

The expression of c-kit receptor (c-kit R; CD117) and CD34 was examined in acute myeloid leukemia (AML), acute lymphoid leukemia (ALL), chronic myeloid leukemia (CML) in blastic transformation (BT), and myelofibrosis (MF) in myeloid BT. In myeloid leukemia including AML, CML-myeloid BT and MF-myeloid BT, both c-kit R and CD34 were expressed synchronously, while in lymphoid leukemia including ALL and CML-lymphoid BT, only CD34 was highly expressed. A close correlation between c-kit R and CD33 expression and an inverse correlation between c-kit R and CD19 expression were observed when all of the myeloid plus lymphoid leukemia cells were analysed. There was a close correlation between c-kit R and CD34 expression in the myeloid leukemia cells. c-kit R expression may be associated with myeloid phenotypes of leukemic cells and may be useful for the diagnosis of myeloid leukemia. The literature of c-kit R expression in leukemic cells is reviewed here and the comparison of c-kit R and CD34 expression in normal hematopoietic progenitor cells with those on the leukemic counterparts was discussed.

Antigens, CD↗
PubMed1994

Expression of sialosyl-Tn in colony-forming unit-erythroid, erythroblasts, B cells, and a subset of CD4+ cells.

The epitopes Tn and sialosyl-Tn are expressed on erythrocytes of individuals with a very rare blood group, who often suffer from "Tn syndrome." We surveyed expression of Tn and sialosyl-Tn in normal blood cells, malignant transformed cells, and progenitor stem cells from bone marrow (BM). An anti-Tn antibody, IE3, and an anti-sialosyl-Tn antibody, TKH2, were used in this study. TKH2 reacted with erythroblasts, B cells, and a subset of CD4+ cells; but not with erythrocytes. Erythroblastic cell lines (K562, HEL, and UT7/EPO) and B-cell lines (Daudi, Raji, and B-cell lines transformed by Epstein-Barr virus) showed reactivity to TKH2. Similar results from the reactivity of TKH2 with transformed cells from leukemia patients and lymphoma patients were obtained; TKH2 reacted with blasts from erythroleukemia (M6; for 4 of 4 cases) and with lymphocytes from B-cell chronic lymphocytic leukemia (3 of 3), B-cell lymphoma (5 of 5), and CD4+ adult T-cell leukemia (4 of 4), but did not react with blasts from acute myeloid leukemia (M0 to M5; 0 of 22) or acute lymphoid leukemia (B-lymphoid leukemia, 0 of 11; T-lymphoid leukemia, 0 of 2; undifferentiated leukemia, 0 of 1). IE3 did not react with all of the tested cells. CD2-CD19-TKH2+ normal BM cells (BMC) contained blasts and various maturation stages of erythroblasts. The TKH2+ cells produced a large number of colony-forming unit-erythroid (CFU-E) colonies, whereas they produced a small number of burst-forming unit-erythroid colonies and CFU-granulocyte-macrophage colonies. CD34+ normal BMC did not express Tn and sialosyl-Tn. These findings suggest that sialosyl-Tn expresses in CFU-E to erythroblasts.

Antibodies, Monoclonal↗
PubMed1994

Development of acute myeloblastic leukaemia in a case of aplastic anaemia treated with granulocyte colony-stimulating factor.

We report a case of aplastic anaemia (AA) treated with granulocyte colony-stimulating factor (G-CSF) terminating as acute myeloblastic leukaemia (AML). Because of severe pneumonia, 250 micrograms of G-CSF was administered for 30 d to promote neutrophil recovery. Following G-CSF therapy, myeoblasts appeared, and the diagnosis of AML was then made. The myeloblasts proliferated in response to G-CSF in vitro and in vivo. In AA, development of AML after treatment with G-CSF is rare. Therefore a careful observation for leukaemic transformation is necessary in long-term administration of G-CSF for AA.

Aged↗
PubMed1993

Bleeding tendency caused by the deposit of amyloid substance in the perivascular region.

A 55-year-old woman, who had systemic amyloidosis associated with multiple myeloma, had sudden development of hematomas of her lip and upper eye lid. There was no evidence of deterioration of multiple myeloma, thrombocytopenia nor deficiency of coagulation factors. Biopsy specimen showed the deposit of amyloid substance in the dermis and perivascular region. The bleeding tendency in this patient with myeloma was likely due to the deposit of amyloid substance in the vascular wall; improvement was achieved with administration of hemostatic agents.

Adrenochrome↗