Emission Ratiometric Imaging of Intracellular Zinc: Design of a Benzoxazole Fluorescent Sensor and Its Application in Two-Photon Microscopy
摘要:
Zinc and calcium are ubiquitous intracellular metals, and while a variety of quantitative probes have been developed for measuring intracellular changes in calcium concentration, the same is not true of zinc. We describe here the design, synthesis, and properties of the benzoxazole-based, ratiometric zinc probe, Zinbo-5. This bright fluorescent reporter has a quantum yield of 0.1 in the zinc-form, exhibits a Kd for Zn2+ in the nanomolar range, and shows significant changes in both excitation and emission maxima upon zinc binding. The utility of this cell permeable probe is demonstrated in fluorescence microscopy emission ratio imaging experiments on mammalian cells. We further show that Zinbo-5 is well suited for two-photon excitation microscopy ratio imaging and can readily reveal changes in intracellular zinc concentration within optical planes of single cells. To the best of our knowledge, this is the first example of two-photon excitation microscopy applied to ratio imaging of zinc. These methods can be applied to real-time emission or excitation ratio imaging studies of zinc physiology in living cells.
BORONIC ACID BEARING LIPHAGANE COMPOUNDS AS INHIBITORS OF P13K- a AND/OR B
申请人:COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH
公开号:US20150051173A1
公开(公告)日:2015-02-19
Compounds with unique liphagane meroterpenoid scaffold having boronic acid functionality in the skeleton are described (formula 1) together with pharmacological potential of these compounds as anticancer agents. A method of preparation and inhibiting the activity of phosphoinositide-3-kinase (PI3K-alpha and beta) has been presented. In particular, the invention describes a method of inhibiting PI3K isoforms, wherein the compounds are novel structures based on liphagane scaffold with unique boronic acid functionality. The methods and uses thereof are described herein this invention.