期刊
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
卷 311, 期 4, 页码 847-852出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2003.10.070
关键词
biosynthesis; steroid; tetrapyrrole; transport; photodynamic therapy
资金
- NIEHS NIH HHS [ES-07747] Funding Source: Medline
The mitochondrial 18 kDa peripheral-type benzodiazepine receptor (PBR), a high affinity cholesterol binding protein, has been shown to interact with protoporphyrin IX (PPIX) and this interaction was assumed to be involved in the regulation of heme biosynthesis and porphyrin-based photodynamic therapy in cancer. In order to test this hypothesis recombinant mouse PBR was expressed in Escherichia coli. The recombinant gene product showed in E coli protoplasts specific affinity for PPIX binding. PPIX could displace PK 11195 binding. Moreover, induced PBR protein expression in E coli protoplasts caused an uptake of PPIX that could be completely inhibited by cholesterol and to a lesser extent inhibited by PK 11195 and Ro5-4864. These results suggest that PBR, in addition to its role in cholesterol and coproporphyrinogen III transport, is also directing the mitochondrial PPIX import, a function that can be ascribed to the 18 kDa PBR protein alone. (C) 2003 Elsevier Inc. All rights reserved.
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