The fate of SPE B after internalization and its implication in SPEB-induced apoptosis.

Abstract:

:After streptococcal pyrogenic exotoxin B (SPE B) induces apoptosis, its fate is unknown. Using confocal time-course microscopy at 37 degrees C, we detected green fluorescence 20 min after adding FITC-SPE B. Orange fluorescence, an indication of co-localization of SPE B with lysosomes which were labeled with a red fluorescent probe, was maximal at 40 min and absent by 60 min. SPE B was co-precipitated with clathrin, which is consistent with endocytotic involvement. Western blotting assay also indicated that uptake of SPE B was maximal at 40 min and disappeared after 60 min. However, in the presence of chloroquine, a lysosome inhibitor, the uptake of SPE B was not detectable. The disappearance of TCA-precipitated FITC-SPE B was parallel to the appearance of TCA soluble FITC-SPE B; in the presence of chloroquine, however, no SPE B degradation occurred. Chloroquine increased the level of SPE B-induced apoptosis by inhibiting the degradation of SPE B. These results suggest that the internalization and degradation of SPE B in cells may be a host defense system that removes toxic substances by sacrificing the exposed cells.

journal_name

J Biomed Sci

authors

Chang CW,Tsai WH,Chuang WJ,Lin YS,Wu JJ,Liu CC,Tsai PJ,Lin MT

doi

10.1007/s11373-007-9154-6

subject

Has Abstract

pub_date

2007-05-01 00:00:00

pages

419-27

issue

3

eissn

1021-7770

issn

1423-0127

journal_volume

14

pub_type

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