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HL-60 cell differentiation induced by phorbol- and 12-deoxyphorbol-esters
W J Ryves1, S Dimitrijevic, P C Gordge
1School of Pharmacy, University of London, Department of Pharmacognosy, UK.
Carcinogenesis
|November 1, 1994
Summary
The study shows that the phorbol ester Doppa must be converted to Dopp within HL-60 cells to induce differentiation. This metabolic conversion is crucial for the differentiating effects, suggesting protein kinase C-beta 1 activation alone is insufficient.
Area of Science:
- Cell biology
- Molecular pharmacology
- Cancer research
Background:
- Human promyelocytic leukaemia (HL-60) cells differentiate into macrophage-like cells when treated with phorbol esters.
- Tumor promoting and non-promoting phorbol esters can induce differentiation.
Purpose of the Study:
- Investigate the differentiation effects of non-promoting phorbol esters Dopp and Doppa on HL-60 cells.
- Compare Dopp and Doppa with the tumor promoter TPA.
- Determine the mechanism of action for Doppa-induced differentiation.
Main Methods:
- HL-60 cell culture and treatment with phorbol esters (TPA, Dopp, Doppa).
- Assessment of cell proliferation, adherence, and morphology.
- Measurement of thymidine incorporation inhibition using HPLC.
- Cell exposure and washing experiments.
Main Results:
- All tested phorbol esters inhibited HL-60 proliferation and induced differentiation.
- TPA was more potent than Dopp and Doppa.
- Doppa was rapidly converted to Dopp in HL-60 cells via C-20 deacylation.
- Dopp and TPA showed similar time courses for thymidine incorporation inhibition, while Doppa's was delayed.
- Dopp and Doppa were more easily washed from cells than TPA.
Conclusions:
- Metabolic conversion of Doppa to Dopp is necessary for HL-60 differentiation.
- PKC-beta 1 activation by Doppa in vitro is not sufficient to drive HL-60 differentiation in vivo.