| Budget Amount *help |
¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000)
Fiscal Year 2014: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2012: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
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| Outline of Final Research Achievements |
We synthesized new phosphorescent iridium complexes BTQ-Mito, BTQSA and BTQDM which are internalized into biological cells without any transfection reagents and show specific localization to mitochondrion, endoplasmic reticulum (ER) and lysosome, respectively. These complexes exhibit oxygen-dependent phosphorescence in living cells. Phosphorescence lifetime measurements of living HeLa cells stained with these probes under a microscope enabled us to examine the subcellular oxygen status. The phosphorescence lifetimes of these probes internalized in HeLa cells were calibrated for the oxygen partial pressure of an incubator according to Stern-Volmer analyses, providing the oxygen quenching rate constant and the average lifetime in the absence of oxygen. Using the values of the oxygen quenching rate constant and the average lifetime, the oxygen level of HeLa cells was evaluated by lifetime measurements.
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