Selenosulfide H2S Probe for Intracellular Delivery
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Solution Overview
Problem
Current reaction-based fluorescent probes for detecting hydrogen sulfide (H2S) face challenges such as low water solubility, inefficient intracellular delivery, and lack of specificity for targeting tissues where H2S is highly expressed, limiting their effectiveness in biological settings.
Innovation Solution
Development of a compound with a selenosulfide functionality, such as AL1, which includes a physicochemical modulator and a fluorescent reporter moiety that selectively reacts with H2S, providing enhanced solubility, cell permeability, and tissue specificity through a selenosulfide tethered to a gem-dimethyl ester framework, allowing for selective detection and visualization of H2S in cells and tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reaction-based fluorescent probes are used to detect H2S, then H2S detection capability is achieved, but water solubility and intracellular delivery efficiency deteriorate
Solution Approach 1:
The probe is divided into separate functional modules: a hydrophobic fluorescent reporter module and a hydrophilic modulator module containing the selenosulfide group. This segmentation allows each module to perform its specialized function - the reporter provides detection capability while the modulator ensures water solubility and cellular uptake, resolving the contradiction between detection performance and delivery efficiency
Solution Approach 2:
The probe employs a composite molecular structure combining hydrophobic aromatic rings (for fluorescence) with hydrophilic selenosulfide and gem-dimethyl ester groups (for solubility and delivery). This composite design integrates both hydrophobic and hydrophilic characteristics into a single molecule, enabling simultaneous achievement of H2S detection capability and improved intracellular delivery
2Measurement precision
If conventional H2S probes are used, then H2S reactivity is achieved, but tissue specificity and targeted delivery deteriorate
Solution Approach 1:
The probe design applies local quality by concentrating H2S reactivity specifically at the selenosulfide functional group location within the molecule. This localized reactive center ensures high H2S reactivity while the rest of the molecular structure can be optimized for tissue targeting and solubility, allowing simultaneous achievement of reactivity and tissue specificity
Solution Approach 2:
The selenosulfide group acts as an intermediary that selectively mediates the interaction between the probe and H2S. This intermediary functional group provides the necessary reactivity toward H2S while being distinct from the targeting moieties, enabling the probe to maintain both H2S-specific reactivity and tissue-targeting capability
3Illumination intensity
If hydrophobic probes are used for H2S detection, then fluorescence response is achieved, but water solubility and biological compatibility deteriorate
Solution Approach 1:
The molecular parameters of the probe are changed by introducing hydrophilic functional groups (selenosulfide and gem-dimethyl ester) alongside the hydrophobic fluorescent reporter. This parameter modification maintains the fluorescent properties while fundamentally altering the solubility characteristics to enable water solubility and biological compatibility
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
The compound achieves high selectivity and stability for H2S detection, with a significant increase in fluorescence intensity upon reaction, and demonstrates improved intracellular delivery and tissue specificity, enabling effective imaging and quantification of H2S in biological samples.
Implementation Method 1
H2S resides predominately in its reactive HS- form under physiological conditions, rendering it a vastly superior reductant and nucleophile at neutral pH
Implementation Method 2
reaction-based fluorescent probes have proven to be invaluable chemical tools for aiding H2S research by providing a non-destructive method for the real-time detection and visualization of H2S within biological samples
Data Source
AI summary
Provided herein is a compound of formula I:and the use thereof for detecting the presence of hydrogen sulfide in cells or tissues in vitro or in vivo. The detecting may be useful, for example, in diagnosing cancer or other diseases related to imbalanced hydrogen sulfide (H2S) production such as neurodegenerative diseases.