Abstract:
:Acute promyelocytic leukemia (APL) has a specific genetic rearrangement between the retinoic acid receptor (RAR)-alpha gene and the pml nuclear protein gene. All-trans retinoic acid (ATRA) induces granulocytic differentiation of APL-derived cells and is used to treat APL patients. However, ATRA interacts with normal cells with RAR throughout the entire body, and when used at high doses or over a long duration, it induces several adverse effects. The development of drugs that selectively act on APL cells may contribute to increasing the therapeutic efficacy of APL treatment as well as elucidating the mechanisms of response to ATRA. In this study, 9-cis retinoic acid alpha-tocopherol ester (9CTT) inhibited the proliferation of APL-derived NB4 and HT93 cells and induced differentiation markers, such as granulocytic maturation, nitroblue tetrazolium reduction, and CD11b expression, in these cells. The effects of 9CTT on non-APL cells, including HL-60 and U937 cells, were much weaker than those on APL cells, and tretinoin tocoferil (TT), which is an alpha-tocopherol ester of ATRA, did not induce the differentiation of APL cells as effectively as 9CTT. The differentiation-inducing effects of 9CTT were inhibited by RAR antagonists. 9CTT and TT similarly induced the transactivating activity of RARs, but were not effective on RXRs. 9CTT downregulated the expression of PML/RAR-alpha protein more effectively than TT, which suggests that it may be involved in the selectivity of 9CTT against APL cells. Interestingly, 9CTT enhanced the differentiation of APL cells induced by ATRA, 9-cis retinoic acid, and synthetic retinobenzoic acids. Combined with 1alpha,25-dihydroxyvitamin D3 (VD3), 9CTT also more than additively induced the differentiation of APL cells. Thus, 9CTT, alone or in combination with other retinoids or VD3, may be useful for the treatment of APL.
journal_name
Bloodjournal_title
Bloodauthors
Makishima M,Umesono K,Shudo K,Naoe T,Kishi K,Honma Ysubject
Has Abstractpub_date
1998-06-15 00:00:00pages
4715-26issue
12eissn
0006-4971issn
1528-0020journal_volume
91pub_type
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