Abstract:
:To evaluate the involvement of protein phosphatases (PP) in differentiation of human myelogenous leukemia HL-60 cells, we made use of potent inhibitors of PP1 and PP2A, calyculin-A (CAL-A) and okadaic acid (OKA). CAL-A and OKA could augment all-trans retinoic acid (ATRA)-induced granulocytic differentiation, whereas the differentiation toward macrophage lineage by 12-o-tetradecanoylphorbol acetate (TPA) was unchanged in the presence of CAL-A. CAL-A augmented the phosphorylation of 18K, 23K and 30K proteins induced by ATRA. The PP1 and PP2A were identified and were present mainly in the cytosol of HL-60 cells. These results suggest that either PP1 or PP2A or both may be involved in regulating granulocytic differentiation of HL-60 cells.
journal_name
FEBS Lettjournal_title
FEBS lettersauthors
Morita K,Nishikawa M,Kobayashi K,Deguchi K,Ito M,Nakano T,Shima H,Nagao M,Kuno T,Tanaka Cdoi
10.1016/0014-5793(92)81501-ckeywords:
subject
Has Abstract,Author List Incompletepub_date
1992-12-21 00:00:00pages
340-4issue
3eissn
0014-5793issn
1873-3468journal_volume
314pub_type
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