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

Chia Wen Chang, Wan Hua Tsai, Woei Jer Chuang, Yee Shin Lin, Jiunn Jong Wu, Ching Chuan Liu, Pei Jane Tsai, Ming T. Lin

研究成果: Article同行評審

5 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)419-427
頁數9
期刊Journal of biomedical science
14
發行號3
DOIs
出版狀態Published - 2007 5月

All Science Journal Classification (ASJC) codes

  • 內分泌學、糖尿病和代謝
  • 分子生物學
  • 臨床生物化學
  • 細胞生物學
  • 生物化學(醫學)
  • 藥學(醫學)

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