Arylidene-imidazolones with three electron-donating substitutions as fluorogenic dyes for lipid droplets of living cells

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Abstract

A pair of new fluorogenic dyes from the arylidene-imidazolones’ family, containing simultaneously three electron-donating groups in the arylidene fragment, has been obtained. The optical properties of the resulting compounds were studied. It was shown that they are characterized by a noticeable bathochromic shift of absorption and emission maxima, as well as a pronounced variation of the position of the emission maximum depending on the properties of the environment. Using the HeLa Kyoto and Huh 7.5 cell lines as an example, we demonstrated that (Z)-5-(3,5-bis(dimethylamino)-4-(ethylamino)benzylidene)-2,3-dimethyl-3,5-dihydro-4H-imidazol-4-one can be used as a selective fluorogenic dye for fluorescent labeling of lipid droplets, which indicates the potential of this fluorogen for staining these organelles in other living systems.

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About the authors

D. I. Rudik

Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry RAS

Author for correspondence.
Email: svetlanakr2002@mail.ru
Russian Federation, Moscow

A. R. Gilvanov

Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry RAS; Pirogov Russian National Research Medical University

Email: svetlanakr2002@mail.ru
Russian Federation, Moscow; Moscow

A. Yu. Smirnov

Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry RAS; Pirogov Russian National Research Medical University

Email: svetlanakr2002@mail.ru
Russian Federation, Moscow; Moscow

Yu. A. Bogdanova

Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry RAS; Pirogov Russian National Research Medical University

Email: svetlanakr2002@mail.ru
Russian Federation, Moscow; Moscow

S. A. Krasnova

Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry RAS

Email: svetlanakr2002@mail.ru
Russian Federation, Moscow

M. S. Baranov

Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry RAS; Pirogov Russian National Research Medical University

Email: svetlanakr2002@mail.ru
Russian Federation, Moscow; Moscow

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Supplementary files

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3. Fig. 1. Micrographs of living HeLa Kyoto (a–c) and Huh 7.5 (d–e) cells stained with compound (IV). (a, d) – Cells in transmitted light; (b, d) – fluorescence of lipid droplets in the CFP channel (excitation filter: 436/20; emission filter: 480/40); (c, e) – superposition of images obtained in transmitted light and the CFP channel. Scale bar – 10 μm.

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4. Scheme 1. Scheme of synthesis of new arylidene-imidazolones (III, IV) with three electron-donating substituents.

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5. Table 1.1

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6. Table 1.2

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