Protein degradation and apoptotic death in lymphocytes during Fiv infection: activation of the ubiquitin-proteasome proteolytic system.

Abstract:

:The movement of a cell through the sequential phases of apoptosis is accompanied by a progressive decrease in cell size with loss in protein mass. In lymphocytes from Hiv-infected persons, protein loss during apoptosis is due to increased protein degradation rather than decreased synthesis. To identify and characterize the proteolytic enzymes or enzyme systems involved in this process, we studied several features of protein turnover in lymphocytes from peripheral blood and lymph nodes during the natural and experimental infection by feline immunodeficiency virus (Fiv). This animal model allowed us to integrate in vivo results with in vitro observations of protein damage. Here we report that protein breakdown in apoptotic cells is concomitant with the activation of the ATP and ubiquitin-dependent multicatalytic system (proteasome). We suggest that proteasome activation is part of the proteolytic cascade in the execution phases of apoptosis in AIDS.

journal_name

Exp Cell Res

authors

Piedimonte G,Crinelli R,Della Salda L,Corsi D,Pennisi MG,Kramer L,Casabianca A,Sarli G,Bendinelli M,Marcato PS,Magnani M

doi

10.1006/excr.1999.4410

keywords:

subject

Has Abstract

pub_date

1999-05-01 00:00:00

pages

381-90

issue

2

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(99)94410-5

journal_volume

248

pub_type

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