Effect of rifampicin to inhibit rapamycin-induced autophagy via the suppression of protein phosphatase 2A activity.

Abstract:

:Recently, a number of studies have focused on the secondary effects of rifampicin. In the present study, we assessed whether rifampicin influences the rapamycin-induced autophagy of RAW 264.7 cells. Here, we demonstrate that the rapamycin-induced autophagy is dependent on protein phosphatase (PP) 2A activity and rifampicin inhibits the activity of PP2A by reducing expressions of PP2A subunits A and C. In addition, rifampicin slightly, but significantly, inhibited the rapamycin-induced dephosphorylation of p70 ribosomal protein S6 kinase (p70S6K) at Thr421/Ser424, which are regulated dually by both rapamycin and PP2A, but not at the rapamycin dephosphorylation site located at Thr389. These results show that rifampicin inhibits rapamycin-induced autophagy, at least in part, via the suppression of PP2A activity.

authors

Park IH,Yeum CE,Chae GT,Lee SB

doi

10.1080/08923970802135732

subject

Has Abstract

pub_date

2008-01-01 00:00:00

pages

837-49

issue

4

eissn

0892-3973

issn

1532-2513

pii

794502438

journal_volume

30

pub_type

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