Okadaic acid suppresses TPA-induced differentiation by stimulating G1/S transition in human myeloblastic leukaemia ML-1 cells.

Abstract:

:The association between the phosphorylation status of the retinoblastoma protein, pRb and changes in cell cycle control caused by either protein kinase C (PKC) or protein kinase A (PKA) stimulation was evaluated in human myeloblastic leukaemia ML-1 cells. TPA-induced PKC activation resulted in dephosphorylation of pRb and subsequently induced ML-1 differentiation based on morphological changes and CD14 expression. In the present study, we showed that inhibition of protein phosphatases (PP-1 and PP-2a) prevented the TPA-induced differentiation in ML-1 cells. Preinhibition of PP-1 and PP-2a activities with 1-100 nM okadaic acid dose-dependently blunted the decrease in the phosphorylation status of pRb obtained with TPA and overrode cell cycle arrest. PKA stimulation with 8-chlorophenylthio-cAMP (100 microM) decreased cell proliferation by 65% and the distribution of cells in the G1 phase significantly increased from 38% to 83% concomitant with a 34% decline in the number of cells present in the S phase. In addition, PKA stimulation significantly decreased the pRb phosphorylation status but did not elicit CD14 expression, indicating that cAMP-induced dephosphorylation of pRb cannot by itself trigger differentiation in ML-1 cells.

journal_name

Cell Prolif

journal_title

Cell proliferation

authors

Reinach PS,Li T,Lu L

doi

10.1046/j.1365-2184.2000.00162.x

subject

Has Abstract

pub_date

2000-08-01 00:00:00

pages

189-202

issue

4

eissn

0960-7722

issn

1365-2184

journal_volume

33

pub_type

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