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Cell Growth & Differentiation, Vol 6, Issue 5 493-503, Copyright © 1995 by American Association of Cancer Research


ARTICLES

Combined vitamin D3/retinoic acid induction of human promyelocytic cell lines: enhanced phagocytic cell maturation and hybrid granulomonocytic phenotype

R Masciulli, U Testa, T Barberi, P Samoggia, E Tritarelli, R Pustorino, G Mastroberardino, A Camagna and C Peschle
Department of Hematology and Oncology, Istituto Superiore di Sanita, Rome, Italy.

Studies on the effect of retinoic acid (RA) and 1,25-dihydroxyvitamin (D3) on the differentiation of leukemic cells have provided insight into the cellular and molecular mechanisms underlying hematopoietic cell differentiation. We have evaluated the combined effect of these chemical inducers on the differentiation of HL-60 and AML-193 promyelocytic leukemia cell lines. Simultaneous RA+D3 addition potentiated leukemic cell maturation up to mature phagocytic cells. Interestingly, AML-193 cells induced with D3 and RA displayed a typical neutrophilic morphology while exhibiting properties specific to monocytic cells, e.g., high expression of CD14 membrane antigen, capacity to bind bacterial lipopolysaccharide, and monocytic-specific esterase activity; this hybrid granulomonocytic (GM) phenotype was not observed upon initial incubation with one inducer and later addition of the other. Parallel control studies were performed with purified normal GM progenitors, triggered by interleukin 3+GM-colony-stimulating factor (CSF) in FCS-rich or -free clonogenic culture, by GM-CSF+M-CSF in FCS-rich clonogenic culture, and by M-CSF in liquid suspension culture. The progenitors grown in the first condition generate exclusively G clones, even upon addition of D3 and/or RA. The progenitors grown in the second and third culture conditions generate either G and M clones (second culture condition) or a population of cells composed by a majority of monocytes (third culture condition); the D3 addition did not modify this differentiation pattern, whereas RA or RA+D3 addition elicited a marked inhibition of monocytic differentiation. These observations suggest that the development of a hybrid GM phenotype is restricted to the progeny of bipotent GM leukemic precursors.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1995 by the American Association of Cancer Research.