Resveratrol is not compatible with a Fura-2-based assay for measuring intracellular Ca²âº signaling.
Biochem Biophys Res Commun
; 450(4): 1626-30, 2014 Aug 08.
Article
en En
| MEDLINE
| ID: mdl-25035923
ABSTRACT
Fura-2 is a commonly used fluorescent Ca(2+) dye that allows an accurate determination of cytosolic Ca(2+) levels by measuring the emission obtained at 510 nm after alternating excitation at 340 nm and 380 nm (F340/F380 ratio). Previous studies, based on Fura-2 measurements, claimed that resveratrol, a polyphenol implicated in human health, triggered an acute rise in cytosolic [Ca(2+)]. In this report, we show that the spectral properties of resveratrol are not compatible with the fluorescent properties of Fura-2. Resveratrol displays a strong absorption of light at a wavelength of 340 nm and a strong emission at 510 nm upon excitation at 340 nm (F340). As a consequence, the F340 values, but not the F380 values, are increased when incubating cells with resveratrol. Consequently the F340/F380 ratio values acutely increase upon addition of resveratrol, independently of changes in cytosolic [Ca(2+)]. Yet, we show that pretreating cells with resveratrol does not affect the F340/F380 ratios of Fura-2, provided that resveratrol is washed away before fluorescence measurement. These results indicate that Fura-2 is not suitable for assessing acute effects of resveratrol on Ca(2+) signaling but that long-time effects can be assessed, provided that the resveratrol is carefully removed by appropriate wash steps.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Estilbenos
/
Fura-2
/
Señalización del Calcio
Idioma:
En
Revista:
Biochem Biophys Res Commun
Año:
2014
Tipo del documento:
Article
País de afiliación:
Bélgica