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- W2030374315 abstract "Protein kinase C (PKC) is reported to play a role in maturation of the myeloid cell and functions of the mature neutrophil. The neutrophils in chronic myeloid leukemia (CML) exhibit defects in several functions. As a step towards understanding the role of PKC in the defects in function of the leukemic cells, this study investigates the expression of PKC isoforms, their subcellular distribution, levels and kinase activity in the normal and leukemic neutrophils. It also investigates changes in representative PKC isoforms during myeloid maturation. This study confirms the presence of PKC alpha, beta and delta and shows, for the first time, the presence of non conventional PKC isoform theta, atypical PKC isoform lambda/iota and PKC isoform mu in normal human neutrophils. In unstimulated cells all the detected PKC isoforms showed a predominantly cytosolic localisation in normal and CML neutrophils. Cytosol-membrane distribution of PKC alpha and delta were significantly altered in leukemic neutrophils as compared to normal cells. Cytosolic levels of all PKC isoforms were reduced in CML neutrophils with PKC alpha, beta, iota, theta, and mu showing a significant decrease. Cytosolic levels of PKC delta contrary to the trend observed for other PKC isoforms showed a slight increase in CML cells, while its membrane levels were significantly reduced in CML neutrophils. Total PKC kinase activity in CML neutrophil cytosol was significantly reduced, while specific kinase activity of two representative isoforms, PKC alpha and delta, from normal and CML neutrophils were similar, thereby increasing the significance of the altered levels of PKC isoforms in CML, and highlighting their role in the defects in function exhibited by the leukemic neutrophils. The levels of PKC delta and iota increased and decreased respectively as the leukemic myeloid cell matured from the blast to the neutrophil, while the levels of PKC alpha and beta were not altered. This suggests a role for PKC delta and iota in the maturation of the leukemic myeloid cell." @default.
- W2030374315 created "2016-06-24" @default.
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- W2030374315 date "2002-01-01" @default.
- W2030374315 modified "2023-09-25" @default.
- W2030374315 title "Protein kinase C isoforms in normal and leukemic neutrophils: altered levels in leukemic neutrophils and changes during myeloid maturation in chronic myeloid leukemia" @default.
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- W2030374315 doi "https://doi.org/10.1016/s0145-2126(01)00098-4" @default.
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