Study summary · research use only
Studies on the subcellular localization of the porphycene CPO
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
This in vitro study used fluorescence resonance energy transfer (FRET) to examine the subcellular binding sites of the porphycene CPO (9-capronyloxytetrakis(methoxyethyl)porphycene) relative to two fluorescent probes: nonyl acridine orange (NAO), which targets mitochondrial cardiolipin, and DiOC6, which labels the endoplasmic reticulum. The authors report FRET between DiOC6 and CPO but not between NAO and CPO, indicating similar localization of CPO and DiOC6. However, when CPO-containing cells were irradiated and then loaded with NAO, FRET was observed, which they interpret as a relocalization of CPO during irradiation. They relate this to CPO-catalyzed photodamage to endoplasmic reticulum and mitochondrial Bcl-2. Species are not specified.
Abstract
This study was designed to provide more detailed information on the subcellular sites of binding of the porphycene, termed 9-capronyloxytetrakis (methoxyethyl) porphycene (CPO), with a fluorescence resonance energy transfer (FRET) technique. The proximity of CPO to two fluorescent probes was determined: nonyl acridine orange (NAO), a dye with specific affinity for the mitochondrial lipid cardiolipin, and dihexa-oxacarbocyanine iodide (DiOC6), an agent that labels the endoplasmic reticulum (ER). FRET spectra indicated energy transfer between DiOC6 and CPO but no significant transfer between NAO and CPO. These results confirm data obtained by fluorescence microscopy, suggesting a similar pattern of subcellular localization by CPO and DiOC6 but not by CPO and NAO. However, when cells containing CPO were irradiated and then loaded with NAO, FRET between the two fluorophores was observed. Hence, a relocalization of CPO can occur during irradiation. These data provide an explanation for recent studies on CPO-catalyzed photodamage to both ER and mitochondrial Bcl-2.
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