Protected Sulfonate Compounds for Cellular Membrane Permeability
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Solution Overview
Problem
Sulfonated molecules, including fluorescent dyes and potential therapeutic agents, face difficulties in crossing cellular membranes due to their high polarity, and there is a lack of effective protecting groups or prodrugs that are stable and easily removable.
Innovation Solution
Development of sulfonate compounds with protected sulfonate groups that can diffuse across cellular membranes and be deprotected by enzymes or reductive conditions within the cell, allowing for the delivery of polar sulfonate fluorescent dyes into live cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If sulfonate groups are used to impart water-solubility to hydrophobic molecules, then water-solubility is improved, but cellular membrane permeability deteriorates
Solution Approach 1:
The sulfonate group is segmented into two functional components: a water-soluble sulfonate moiety and a lipophilic protecting group. This segmentation allows the molecule to exhibit both water solubility (through the sulfonate) and membrane permeability (through the protecting group), resolving the contradiction between these two properties.
Solution Approach 2:
A lipophilic protecting group acts as an intermediary that temporarily masks the polar sulfonate group, enabling the conjugate to cross cellular membranes. Once inside the cell, intracellular enzymes or reductive conditions remove the protecting group, releasing the active sulfonate compound. This intermediary resolves the contradiction by providing temporary lipophilicity for membrane crossing while maintaining the ultimate water-solubility function.
2Stability of the object's composition
If sulfonate esters are made stable, then chemical stability is improved, but deprotection conditions become harsh
Solution Approach 1:
The protecting group is designed with specific chemical parameters that allow it to be stable under physiological conditions (resisting hydrolysis by extracellular esterases) yet labile under intracellular conditions (sensitive to intracellular esterases or reductive environments). This parameter change approach resolves the contradiction by creating conditional stability rather than absolute stability.
Solution Approach 2:
The protecting group exhibits different stability characteristics in different cellular locations: it is stable in the extracellular environment and during membrane crossing, but becomes labile in the intracellular environment where specific enzymes or reducing conditions are present. This local quality differentiation resolves the contradiction between stability and ease of deprotection.
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
Enables the delivery of sulfonate fluorescent dyes into cellular environments, facilitating imaging and therapeutic applications by overcoming the barrier of cellular membrane permeability.
Implementation Method 1
certain protected sulfonated fluorescent dyes can readily diffuse across cellular membranes
Implementation Method 2
irradiating the cell with an excitation light, thereby generating fluorescence from the cell
Data Source
AI summary
This disclosure relates to compounds containing a fluorophore covalently bonded to at least one protected sulfonate group of formula (I):in which X and R2-R5 are defined in the specification. This disclosure also relates to use of these compounds as dyes in an imaging methods, as well as intermediates that can be used to prepare these compounds.