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Mol. Cell. Biol., 06 1995, 3032-3040, Vol 15, No. 6
LB Owen-Schaub, W Zhang, JC Cusack, LS Angelo, SM Santee, T Fujiwara, JA Roth, AB Deisseroth, WW Zhang and E Kruzel
Fas/APO-1 is a cell surface protein known to trigger apoptosis upon
specific antibody engagement. Because wild-type p53 can activate
transcription as well as induce apoptosis, we queried whether p53 might
upregulate Fas/APO-1. To explore this possibility, we examined human
p53-null (H358 non-small-cell lung adenocarcinoma and K562 erythroleukemia)
and wild-type p53-containing (H460 non-small-cell lung adenocarcinoma) cell
lines. When H358 or H460 cells were transduced with a replication-deficient
adenovirus expression construct containing the human wild-type p53 gene but
not with vector alone, a marked upregulation (approximately a three-to
fourfold increase) of cell surface Fas/APO-1 was observed by flow
cytometry. Similarly, K562, cells stably transfected with a plasmid vector
containing the temperature-sensitive human p53 mutant Ala-143 demonstrated
a four- to sixfold upregulation of Fas/APO-1 by flow-cytometric analysis at
the permissive temperature of 32.5 degrees C. Temperature-sensitive
upregulation of Fas/APO-1 in K562 Ala-143 cells was verified by
immunoprecipitation and demonstrated to result from enhanced mRNA
production by nuclear run-on and Northern (RNA) analyses. Stably
transfected K562 cells expressing temperature-insensitive,
transcriptionally inactive p53 mutants (His-175, Trp-248, His-273, or
Gly-281) failed to upregulate Fas/APO-1 at either 32.5 degrees or 37.5
degrees C. The temperature-sensitive transcription of Fas/APO-1 occurred in
the presence of cycloheximide, indicating that de novo protein synthesis
was not required and suggested a direct involvement of p53. Collectively,
these observations argue that Fas/APO-1 is a target gene for
transcriptional activation by p53.
Copyright © 1995, American Society for Microbiology
Wild-type human p53 and a temperature-sensitive mutant induce Fas/APO-1 expression
Department of Immunology, University of Texas M. D. Anderson Cancer Center, Houston 77030, USA.
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