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Nuclear localization and characterization of alkaline phosphatase in neutrophils from normal controls and pregnant women
Author(s) -
Vergnes Henri A.,
BrissonLougarre Andrée,
Grozdea Jean G.,
Blum Claude J.,
Kihn Y.,
Sevely J.
Publication year - 1992
Publication title -
american journal of hematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.456
H-Index - 105
eISSN - 1096-8652
pISSN - 0361-8609
DOI - 10.1002/ajh.2830390404
Subject(s) - alkaline phosphatase , isozyme , enzyme , cytochemistry , immunocytochemistry , context (archaeology) , lactate dehydrogenase , biology , medicine , chemistry , endocrinology , biochemistry , paleontology
Abstract There were controversial data concerning localization of alkaline phosphatase (AP) in neutrophil nuclei under physiological conditions. In this context, the AP pattern has been determined on nuclei preparations from normal human neutrophils. Blood cells were isolated from 10 healthy adults and from 3 women in the third trimester of an uncomplicated pregnancy. Purity of nuclear suspension was checked by electron microscopy and assay of organelle marker enzymes. Electron microscope cytochemistry and immunocytochemistry studies were carried out on WBC. Enzyme characterization was performed by the usual biochemical procedures. AP was found in nuclear preparations from four of ten normal controls. When present, AP was detected in approximately two‐thirds of the nuclei examined, representing an average of 20% of the total cell activity. Conversely, a large amount of nucleus‐bound enzyme (55% of total AP activity) was recognized in all pregnant women samples. Biochemical and immunological characteristics clearly differentiate AP forms in the two groups of subjects. Normal controls have an heterogeneous enzyme pattern. AP positive preparations contain a mixture of isoenzymes: a prominent heat labile form and a relatively heat stable minor component. The heat stable fraction displays some properties similar to those previously described in leukocyte AP. Pregnant women express a unique very heat labile isoenzyme identical in its main characteristics to the early placental type. © 1992 Wiley‐Liss, Inc.