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6-ethylmercaptopurine-mediated growth inhibition of HL-60 cells in vitro irrespective of purine salvage.

Abstract：

:A variety of purine analogs inhibit the growth and induce the differentiation of human promyelocytic leukemia (HL-60) cells that lack the purine salvage enzyme hypoxanthine-guanine phosphoribosyltransferase (HGPRT). Mechanisms by which purine analogs induce differentiation offer unique potential for cancer chemotherapy. The guanine analogs, 6-thioguanine and 8-azaguanine, induce granulocytic differentiation of HGPRT-deficient HL-60 promyelocytes. Although these compounds are useful as model purine analogs that induce differentiation in HGPRT-deficient HL-60 cells, they suffer the disadvantage that they are highly cytotoxic to wild-type cells. We studied the effect of the hypoxanthine analog 6-ethylmercaptopurine on wild-type and HGPRT-deficient HL-60 cells. 6-Ethylmercaptopurine inhibits growth and produces a specific terminal end-cell in both types of HL-60 cells. The mechanism appears to be independent of the normal modes of cytotoxic activation through HGPRT or adenine phosphoribosyltransferase (APRT), since no new peaks were seen in HPLC chromatograms of the nucleotide pools. Furthermore, hypoxanthine and adenine failed to prevent growth inhibition by 6-ethylmercaptopurine, and inhibition of IMP dehydrogenase and the consequential alteration of the guanine nucleotide pools does not appear to be involved. The mechanism differs from that of guanine analog-induced differentiation in HGPRT-deficient HL-60 cells.

journal_name

Cancer Chemother Pharmacol

journal_title

Cancer chemotherapy and pharmacology

authors

Gibboney DS,French BT,Patrick DE,Trewyn RW

doi

10.1007/BF00689581

subject

Has Abstract

pub_date

1989-01-01 00:00:00

pages

189-94

issue

3

eissn

0344-5704

issn

1432-0843

journal_volume

25

pub_type

杂志文章

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