Paramagnetic Nanoparticle Cell Modulation via Magnetic Field Excitation
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Solution Overview
Problem
Current methods for remotely controlling cell function, such as electrical and chemical lesions, and light-activated systems, are invasive, limited in spatial control, and have slow time courses, making them inadequate for precise modulation of cellular activity in specific cell types.
Innovation Solution
The use of radiofrequency waves or magnetic fields to excite endogenous paramagnetic nanoparticles, which are expressed in specific cells, inducing physical changes that modulate ion flow and trigger cellular responses, allowing for non-invasive and rapid control of cell activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical and chemical lesions are used to ablate neurons and fibers, then cell activity can be modulated, but tissue damage and permanent implants are required
Solution Approach 1:
The patent replaces electrical and chemical ablation methods with optogenetic and chemogenetic approaches. Specifically, it uses light-activated ion channels (optogenetics) and GPCR-based systems (chemogenetics) to modulate cell activity without causing tissue damage, thereby substituting harmful mechanical and chemical methods with non-invasive optical and biochemical mechanisms.
Solution Approach 2:
The patent introduces intermediary molecules including photoactivatable compounds (caged compounds) and GPCR ligands that act as mediators between external stimuli and cellular responses. These intermediaries enable precise control of cell activity through non-invasive means, avoiding direct electrical or chemical damage to tissues.
2Ease of operation
If direct stimulation through implanted electrodes is used, then cell activity can be controlled, but variable activation and need for permanent implants occur
Solution Approach 1:
The patent substitutes implanted electrode systems with non-invasive optical and biochemical delivery methods. By using light delivery systems and systemically administratable chemogenetic ligands, the patent eliminates the need for permanent implants while maintaining precise cell activity control.
Solution Approach 2:
The patent employs universal control mechanisms where a single light delivery system or a single chemogenetic ligand can control multiple cell types expressing different optogenetic or chemogenetic tools. This multi-functionality reduces the need for multiple specialized implants while providing versatile cell activity control.
3Reliability
If drug inducible systems are used to alter gene expression, then cell activity can be modulated, but time course is slow (hours to days)
Solution Approach 1:
The patent replaces slow drug-inducible gene expression systems with optogenetic systems that provide immediate cellular responses upon light activation. The direct coupling of light absorption to ion channel opening eliminates the transcriptional translation delay inherent in drug-inducible systems.
Solution Approach 2:
The patent employs preliminary action by pre-expressing optogenetic tools (light-activated ion channels) in target cells before stimulation is needed. This allows immediate cellular response upon light delivery without requiring time for drug action and gene expression, thus reducing the time course from hours/days to seconds.
4Speed
If light-activated systems are used, then rapid cell activation is achieved, but invasive fiber optic delivery is required
Solution Approach 1:
The patent substitutes invasive fiber optic light delivery with non-invasive light delivery methods such as cranial windows, optical fibers implanted only at accessible locations, or potential future methods like transdermal light delivery. This maintains rapid optogenetic activation while reducing invasive procedures.
Solution Approach 2:
The patent uses intermediaries such as cranial windows or optically transparent materials that allow light to reach target cells without requiring direct fiber optic insertion into brain tissue. These intermediaries enable non-invasive or minimally invasive light delivery while maintaining the speed advantage of optogenetics.
5Measurement precision
If light-activated systems are used, then anatomical specificity is achieved, but limited number of anatomic sites can be regulated simultaneously
Solution Approach 1:
The patent employs universal optogenetic and chemogenetic tools that can be expressed in multiple cell types across different anatomical locations. A single light delivery system or a single chemogenetic ligand can simultaneously control multiple distributed cell populations, thereby increasing the number of regulatable sites while maintaining anatomical specificity through selective expression patterns.
Solution Approach 2:
The patent uses dynamic control where the same optogenetic or chemogenetic system can be selectively activated in different anatomical locations by controlling where and when the activating stimulus (light or ligand) is applied. This dynamic flexibility allows regulation of multiple anatomic sites with a single system.
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 remote, non-invasive modulation of cell activity, including gene expression and protein production, with high spatial and temporal precision, applicable for treating various diseases by regulating neural and other cellular functions.
Implementation Method 1
the use of radiofrequency waves or a magnetic field to excite endogenous paramagnetic nanoparticles produced by specific cell types
Implementation Method 2
The invention uses Nanoparticle Induced Cellular Regulation (NICR) to, for example, regulate ion channels as a means for stimulating or inhibiting the activity of specific cells remotely and non-invasively and at one or at multiple sites
Implementation Method 3
The excitation of the paramagnetic nanoparticles results in a localized temperature increase and/or mechanical force
Implementation Method 4
The cell type of interest expresses an ion channel tethered to a metal binding protein associated with paramagnetic nanoparticles, wherein exposure of the paramagnetic nanoparticles to an electromagnetic or magnetic field results in a physical change that is transduced into a cellular response
Implementation Method 5
exposure of the paramagnetic nanoparticles to an electromagnetic or magnetic field results in a physical change that is transduced into a cellular response via changes in ion flow across a cell membrane
Implementation Method 6
The cell type of interest expresses an ion channel tethered to a metal binding protein associated with paramagnetic nanoparticles, wherein exposure of the paramagnetic nanoparticles to an electromagnetic or magnetic field results in a physical change that is transduced into a cellular response
Implementation Method 7
By allowing the selective passage of cations or anions, families of ion channels regulate intracellular ion concentrations, which in turn modulate intracellular functions according to the cell type
Data Source
AI summary
The present invention provides methods and compositions for the remote control of cell function based on the use of a magnetic field to excite paramagnetic nanoparticles targeted to specific cell types. The cell type of interest expresses an ion channel wherein excitation of the paramagnetic nanoparticles results in a physical change that is transduced into a cellular response. Such cellular responses may include, for example, increases in gene expression resulting in production of one or more physiologically active proteins. The expression of such proteins can be used to treat a variety of different inherited or acquired diseases or disorders in a subject.