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Characteristics of 25-hydroxycholesterol-induced apoptosis in the human leukemic cell line CEM.

Abstract：

:Cholesterol and related compounds can give rise to oxygenated sterol molecules (oxysterols) which are potent regulators of lymphoid cell growth. Oxysterols added exogenously cause cell death of several lines of cultured cells, and on the basis of limited criteria, it has been suggested that this death is apoptosis. In the present study, we show definitive evidence that 25-hydroxycholesterol (25OHC) kills cells of the clone CEM-C7 by apoptosis and establish the temporal sequence of related cellular and biochemical events. Cell shrinkage was evident as early as 12 h, while cell death was not evident until after 24 h. It mounted rapidly after that, and by 72 h, virtually all cells were dead. Electron microscopic analysis shows that by 24 h after treatment and before the onset of cell death, early ultrastructural features typical of apoptosis were present. DNA breaks were detected by TUNEL assay prior to the onset of cell death. Two types of specific DNA pieces often associated with apoptosis were found as increasing numbers of cells died. DNA fragments of 300 and 50 kbp were not appreciable until 42 h, and internucleosomal cleavage was observed by 48 h after oxysterol addition. None of these effects were seen in an oxysterol-resistant CEM subclone, establishing the specificity for apoptosis of the biochemical and morphological events. z-VAD.FMK, a peptide inhibitor of ICE-related proteases delayed but did not prevent the apoptosis of CEM-C7 cells induced by 25OHC. The addition of mevalonate partially protected CEM-C7 cells from apoptosis but did not restore cell growth.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Ayala-Torres S,Moller PC,Johnson BH,Thompson EB

doi

10.1006/excr.1997.3630

subject

Has Abstract

pub_date

1997-08-25 00:00:00

pages

35-47

issue

1

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(97)93630-2

journal_volume

235

pub_type

杂志文章

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