Differentiation of human myeloblastic leukemia ML-1 cells into macrophages by staurosporine, an inhibitor of protein kinase activities.

Abstract:

:Protein kinase activities are involved in cellular proliferation and differentiation, and inhibitors of these activities are useful for studying the mechanisms of induction of differentiation. We found that staurosporine, an inhibitor of protein kinase activities, induced morphological differentiation of human myeloblastic leukemia ML-1 cells along myelomonocytic lineage and also induced functional differentiation (increase in nitroblue tetrazolium-reducing and lysozyme activities) in the cells. Several other protein kinase inhibitors such as 1-(5-isoquinolinesulfonyl)-2-methylpiperazine dihydrochloride (H-7), sphingosine, N-(6-aminoethyl)-5-chloro-1-naphthalenesulfonamide and 1-(5-chloronaphthalene-1-sulfonyl)-1H-hexahydro-1,4-diazepine hydrochloride (ML-9) did not induce the differentiation of ML-1 cells. Treatment with staurosporine induced formation of granules in ML-1 cells, and the granules showed metachromasia by toluidine blue staining; however, histamine content did not increase. The "metachromatic" ML-1 cells were positive for CD14, indicating that staurosporine induced the differentiation of ML-1 cells into metachromatic monocytes/macrophages, 1 alpha,25-dihydroxyvitamin D3 (VD3) enhanced appearance of metachromatic granules in staurosporine-treated cells. These results suggest that modulation of protein phosphorylation by a staurosporine-sensitive protein kinase(s) may be associated with differentiation of ML-1 leukemia cells.

journal_name

Exp Hematol

journal_title

Experimental hematology

authors

Makishima M,Honma Y,Hozumi M,Sampi K,Motoyoshi K,Nagata N,Hattori M

subject

Has Abstract

pub_date

1993-07-01 00:00:00

pages

839-45

issue

7

eissn

0301-472X

issn

1873-2399

journal_volume

21

pub_type

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