Abstract:
:Human promyelocytic leukemia cells (HL-60) were treated with several differentiation inducers, then the changes in the activity of cytosolic protein kinase C (PKC) isoforms were examined by hydroxylapatite chromatography and the species of the isoforms were determined immunologically. In three undifferentiated HL-60 cell lines examined, PKC alpha and beta isoforms were present, but PKC gamma isoform was not detected. When the cells were induced by dimethylsulfoxide, dibutyryl cAMP, or nicotinamide to differentiate into granulocytes, these two PKC isoforms each increased to about 2- to 3-fold. When retinoic acid was used as the inducer, in addition to PKC alpha and beta, a third PKC isoform appeared. This isoform was clearly distinct from rat PKC alpha, beta, and gamma, immunologically. This isoform showed a distinctly lower Ca(2+)-requirement (3 microM) than that of PKC alpha or beta (100 microM) and was more dependent on cardiolipin and phosphatidylethanolamine, compared with PKC alpha, beta, and gamma. These results suggest that while the increases in the activities of PKC alpha and beta isoforms are common in the differentiation program initiated by several inducers, including retinoic acid, the emergence of an unclassified PKC isoform is a retinoic acid-specific process.
journal_name
J Biochemjournal_title
Journal of biochemistryauthors
Tanaka Y,Yoshihara K,Tsuyuki M,Itaya-Hironaka A,Inada Y,Kamiya Tdoi
10.1093/oxfordjournals.jbchem.a123747keywords:
subject
Has Abstractpub_date
1992-02-01 00:00:00pages
265-71issue
2eissn
0021-924Xissn
1756-2651journal_volume
111pub_type
杂志文章abstract::The direct ion-dipolar interactions between potassium ion (K(+)) and the two hydroxyl groups of the substrate are the most striking feature of the crystal structure of coenzyme B(12)-dependent diol dehydratase. We carried out density-functional-theory computations to determine whether K(+) can assist the 1,2-shift of ...
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