Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (8): 2443.doi: 10.7503/cjcu20210140

• Organic Chemistry • Previous Articles     Next Articles

Carbazole-derived Dicyanostilbene Two-photon Fluorescence Probe for Lipid Raft

HUANG Chibao1,2(), KANG Shuai1, PAN Qi1, LYU Guoling1   

  1. 1.School of Information Engineering,Zunyi Normal University,Zunyi 563002,China
    2.Henry Fok School of Biology and Agriculture,Shaoguan University,Shaoguan 512005,China
  • Received:2021-03-03 Online:2021-08-10 Published:2021-08-05
  • Contact: HUANG Chibao E-mail:huangchibao@163.com

Abstract:

Lipid raft is a microdomain which is rich in cholesterol and sphingolipid(sphingomyelin and glycosphingolipid) in the cytoplasmic membrane. They are involved in cellular processes such as cell transduction and protein transport, and are closely related to neurodegenerative diseases such as Alzheimer's disease and prion disease. Therefore, the studies on the dynamic physiological processes and the action mechanism of lipid raft are helpful to reveal its life mystery and its correlations with some diseases. The two-photon fluorescence probe for lipid raft became an indispensable sharp tool to achieve this goal. A carbazole-derived two-photon fluorescence probe for lipid raft(DLR) was developed and characterized. DLR belonged to push-pull electronic architecture(donor-bridge-receptor, D-π-A). The maximum emission wavelength of the probe increased with the medium polarity and its fluorescence intensity decreased with the polarity. The emission intensity of DLR in dipalmitoylphosphatidylcholine(DPPC) was 20 times higher than that in dioleoylphosphatidylcholine(DOPC), and the fluorescence intensity ratio of DLR in DPPC, Raft mix[n(DOPC)∶n(sphingomyelin)∶ n(cholesterol)=1∶1∶1] and DOPC was 20∶12.8∶1, and its fluorescence lifetime in DPPC was more than 2.2 times that in DOPC, which indicated that DLR could distinguish DPPC from DOPC. The two-photon action cross sections(Φδ) of DLR in DPPC and DOPC were 1350 and 67 GM, respectively. DLR was able to image lipid raft distribution in cells and tissues.

Key words: Two-photon, Lipid raft sensor, Lipid raft, Polarity, Bio-imaging (Ed.: P, H, W, K)

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