Lanthanide Probes for Primary Cilia Imaging
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Solution Overview
Problem
Current methods for visualizing primary cilia lack direct and specific imaging tools, relying on indirect methods like immunostaining which are limited by fixation issues and auto-fluorescence, hindering the understanding of primary cilium's role in cellular processes and its correlation with human diseases.
Innovation Solution
Development of cyclen-based lanthanide complexes, particularly europium complexes, that exhibit specific subcellular localization in primary cilia, enabling direct imaging and potential protein targeting or pull-down experiments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If indirect imaging methods like immunostaining are used, then primary cilia can be visualized, but the method is limited by fixation issues and auto-fluorescence interference
Solution Approach 1:
The patent introduces lanthanide ions as intermediary contrast agents that mediate between the imaging system and primary cilia. These ions complex with cyclen-based ligands to form probes that specifically target primary cilia, enabling imaging without the harmful effects of auto-fluorescence that plague direct fluorescent labeling methods
Solution Approach 2:
The patent exploits the unique photophysical parameters of lanthanide ions, particularly their long fluorescence lifetimes (micro to millisecond region), to resolve the contradiction. By using time-gated detection systems that wait for autofluorescence to decay before capturing the lanthanide signal, the method achieves high specificity while eliminating autofluorescence interference
2Measurement precision
If indirect imaging methods are used, then primary cilia visualization is achieved, but fixation and delivery issues limit the method
Solution Approach 1:
The lanthanide-cyclen complexes are designed to be cell-permeable and self-targeting to primary cilia without requiring complex fixation protocols or delivery mechanisms. The probes enter cells autonomously and selectively accumulate in primary cilia through their molecular design, simplifying the overall imaging procedure
Solution Approach 2:
The cyclen-based ligand acts as an intermediary that facilitates the delivery of lanthanide ions to primary cilia. This mediator approach replaces complex delivery systems with a simple small molecule that naturally targets the desired organelle, eliminating fixation issues associated with larger biomolecules
3Loss of information
If immunostaining with antibodies or green fluorescent proteins is used, then primary cilia can be marked, but the amount of information obtained is limited
Solution Approach 1:
The lanthanide-cyclen platform provides multi-functional capability for primary cilia imaging. By changing the lanthanide ion (Eu³⁺, Tb³⁺, Dy³⁺, etc.), researchers can access different emission wavelengths and lifetimes from the same structural platform, enabling multiplexed imaging and obtaining comprehensive information about primary cilia structure and function
Solution Approach 2:
The patent utilizes the characteristic emission colors of different lanthanide ions to provide rich information about primary cilia. Each lanthanide ion emits at distinct wavelengths (e.g., Eu³⁺ at 615 nm, Tb³⁺ at 545 nm, Dy³⁺ at 484 nm), enabling color-coded imaging that provides detailed structural and functional information without increasing probe complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These complexes allow for specific and efficient visualization of primary cilia, reducing auto-fluorescence interference and providing detailed imaging capabilities in vitro and in vivo, facilitating the study of primary cilium's functions and its role in diseases.
Implementation Method 1
The long emission lifetimes (micro to millisecond region), hypersensitive, sharp and fingerprint spectral profile of europium, paired with a time-gated system, can effectively eliminate the interfering autofluorescence
Data Source
AI summary
Provided herein are lanthanide complexes that exhibit specific subcellular localization to primary cilium. The lanthanide complexes provided herein are useful for imaging, tagging, and pull down of binding targets located in primary cilium.