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Microfilament-dependent modulation of cytoplasmic protein binding to TNFalpha mRNA AU-rich instability element in human lymphoid cells.

Abstract：

:Cytoplasmic proteins with binding capability to AU-rich instability determinant sequences (ARE) of tumour necrosis factor alpha (TNFalpha) mRNA 3' untranslated region (3'UTR) were assessed in human lymphoid cells. In vitro label transfer experiments using wild type as well as mutant sequences in which the 70 nucleotide-long AUUUA pentamer-containing portion of the 3'UTR had been deleted conferred binding specificity to five major activities of 22/25-, 38/40-, 50-, 60- and 80-kDa proteins in cytoplasmic extracts of peripheral blood mononuclear cells (PBMCs). Cytochalasin-induced disarrangement of the F-actin-based microfilament system led to a Triton X-100-insoluble to soluble redistribution of these binding activities. No such changes were observed in Jurkat tumour cells. Combination of in vivo UV-crosslinking and in vitro label transfer experiments revealed considerable differences in RNA association between proteins of the same cell type as well as between proteins of identical molecular weight (Mw) derived from either PBMCs or Jurkat cells. Our findings may explain some aspects of differential regulation of interleukin 2 (IL-2) and TNFalpha mRNA stability upon microfilament disruption in human PBMCs observed in an earlier study. These results also suggest that the physical state of cytoplasmic structural environment might contribute to important regulatory processes regarding key elements of eukaryotic mRNA metabolism, such as modulation of stability. Finally, these data highlight the possibility that the often observed disorganization of the cytoskeleton in tumour cells may partly be responsible for the maintenance of the neoplastic state, a phenomenon that potentially involves ARE-AUBP interactions.

journal_name

Cell Biol Int

journal_title

Cell biology international

authors

Henics T

doi

10.1006/cbir.1999.0418

keywords:

subject

Has Abstract

pub_date

1999-01-01 00:00:00

pages

561-70

issue

8

eissn

1065-6995

issn

1095-8355

pii

S1065-6995(99)90418-3

journal_volume

23

pub_type

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