期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 29, 页码 9917-9922出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201902272
关键词
bioimaging; Ca2+sensor; calcium; fluorescent probes; mitochondria
资金
- University of Padua (STARS Grants programme CHEMPROCALIM)
- MIUR
- Italian Ministry of Education
- Fondazione Cassa di Risparmio di Padova e Rovigo (CARIPARO) Foundation
- Consiglio Nazionale delle Ricerche (CNR)
- Telethon Foundation
Ca2+ handling by mitochondria is crucial for cell life and the direct measure of mitochondrial Ca2+ concentration in living cells is of pivotal interest. Genetically-encoded indicators greatly facilitated this task, however they require demanding delivery procedures. On the other hand, existing mitochondriatargeted synthetic Ca2+ indicators are plagued by several drawbacks, for example, non-specific localization, leakage, toxicity. Here we report the synthesis and characterization of a new fluorescent Ca2+ sensor, named mt-fura-2, obtained by coupling two triphenylphosphonium cations to the molecular backbone of the ratiometric Ca2+ indicator fura-2. Mt-fura-2 binds Ca2+ with a dissociation constant of & 1.5 mm in vitro. When loaded in different cell types as acetoxymethyl ester, the probe shows proper mitochondrial localization and accurately measures matrix [ Ca2+] variations, proving its superiority over available dyes. We describe the synthesis, characterization and application of mt-fura-2 to cell types where the delivery of genetically-encoded indicators is troublesome.
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