Source 1primary paper2021Nature Communications
Toolkit/Ce:GAGG microparticles
Ce:GAGG microparticles
Also known as: Ce-doped Gd3(Al,Ga)5O12 (Ce:GAGG), injectable Ce:GAGG microparticles
Taxonomy: Mechanism Branch / Architecture. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
Ce-doped Gd3(Al,Ga)5O12 (Ce:GAGG) microparticles are injectable yellow-emitting inorganic scintillators used as implanted transducers for X-ray-driven optogenetic control. In the cited study, they converted X-ray irradiation into local light sufficient to activate ChRmine and inhibit via GtACR1, enabling bidirectional modulation of neural activity in mice.
Usefulness & Problems
Why this is useful
Ce:GAGG microparticles provide a way to couple externally delivered X-rays to local optical control of genetically targeted neurons through implanted scintillators. This is useful for remote bidirectional neuromodulation in freely moving animals and for chronic implantation because the reported particles were non-cytotoxic and biocompatible.
Source:
Using injectable Ce:GAGG microparticles, we successfully activated and inhibited midbrain dopamine neurons in freely moving mice by X-ray irradiation, producing bidirectional modulation of place preference behavior.
Problem solved
These microparticles address the problem of delivering light to deep neural targets for optogenetic excitation and inhibition without direct optical hardware at the target site. The reported system specifically enabled X-ray-driven control of midbrain dopamine neurons and associated place preference behavior in mice.
Taxonomy & Function
Primary hierarchy
Mechanism Branch
Architecture: A delivery strategy grouped with the mechanism branch because it determines how a system is instantiated and deployed in context.
Mechanisms
local photonic activation of opsinslocal photonic inhibition of opsinsx-ray-induced scintillationTechniques
Structural CharacterizationTarget processes
No target processes tagged yet.
Implementation Constraints
Implementation involved injectable Ce:GAGG microparticles implanted as local scintillating transducers and paired with opsin expression, specifically ChRmine or GtACR1. Actuation used pulsed X-ray irradiation at a clinical dose level, but the supplied evidence does not provide construct design, dosing parameters, or delivery workflow details.
The provided evidence is limited to a single cited study and focuses on X-ray-driven optogenetic control in mice. The available text does not specify particle size, emission spectrum details, implantation procedure, long-term stability, or validation beyond the reported biocompatibility and behavioral experiments.
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Observations
successMouseapplication demomousemidbrain dopamine neurons
place preference behavior
Inferred from claim c2 during normalization. Injectable Ce:GAGG microparticles enabled X-ray-driven activation and inhibition of midbrain dopamine neurons in freely moving mice, producing bidirectional modulation of place preference behavior. Derived from claim c2. Quoted text: Using injectable Ce:GAGG microparticles, we successfully activated and inhibited midbrain dopamine neurons in freely moving mice by X-ray irradiation, producing bidirectional modulation of place preference behavior.
Source:
successMouseapplication demomousebrain and bone marrow
behavioral changes
Inferred from claim c4 during normalization. Pulsed X-ray irradiation at a clinical dose level was sufficient to elicit behavioral changes without reducing the number of radiosensitive cells in the brain and bone marrow. Derived from claim c4. Quoted text: Pulsed X-ray irradiation at a clinical dose level is sufficient to elicit behavioral changes without reducing the number of radiosensitive cells in the brain and bone marrow.
Source:
Supporting Sources
Ranked Claims
Ce:GAGG can effectively activate the red-shifted excitatory opsin ChRmine and the inhibitory opsin GtACR1.
Here we show that a yellow-emitting inorganic scintillator, Ce-doped Gd3(Al,Ga)5O12 (Ce:GAGG), can effectively activate red-shifted excitatory and inhibitory opsins, ChRmine and GtACR1, respectively.
Ce:GAGG microparticles are non-cytotoxic and biocompatible, allowing chronic implantation.
Ce:GAGG microparticles are non-cytotoxic and biocompatible, allowing for chronic implantation.
Injectable Ce:GAGG microparticles enabled X-ray-driven activation and inhibition of midbrain dopamine neurons in freely moving mice, producing bidirectional modulation of place preference behavior.
Using injectable Ce:GAGG microparticles, we successfully activated and inhibited midbrain dopamine neurons in freely moving mice by X-ray irradiation, producing bidirectional modulation of place preference behavior.
Pulsed X-ray irradiation at a clinical dose level was sufficient to elicit behavioral changes without reducing the number of radiosensitive cells in the brain and bone marrow.
Pulsed X-ray irradiation at a clinical dose level is sufficient to elicit behavioral changes without reducing the number of radiosensitive cells in the brain and bone marrow.
Approval Evidence
1 source4 linked approval claimsfirst-pass slug ce-gagg-microparticles
Here we show that a yellow-emitting inorganic scintillator, Ce-doped Gd3(Al,Ga)5O12 (Ce:GAGG)... Using injectable Ce:GAGG microparticles...
Source:
activation capabilitysupports
Ce:GAGG can effectively activate the red-shifted excitatory opsin ChRmine and the inhibitory opsin GtACR1.
Here we show that a yellow-emitting inorganic scintillator, Ce-doped Gd3(Al,Ga)5O12 (Ce:GAGG), can effectively activate red-shifted excitatory and inhibitory opsins, ChRmine and GtACR1, respectively.
Source:
biocompatibilitysupports
Ce:GAGG microparticles are non-cytotoxic and biocompatible, allowing chronic implantation.
Ce:GAGG microparticles are non-cytotoxic and biocompatible, allowing for chronic implantation.
Source:
in vivo neural modulationsupports
Injectable Ce:GAGG microparticles enabled X-ray-driven activation and inhibition of midbrain dopamine neurons in freely moving mice, producing bidirectional modulation of place preference behavior.
Using injectable Ce:GAGG microparticles, we successfully activated and inhibited midbrain dopamine neurons in freely moving mice by X-ray irradiation, producing bidirectional modulation of place preference behavior.
Source:
xray dose tolerabilitysupports
Pulsed X-ray irradiation at a clinical dose level was sufficient to elicit behavioral changes without reducing the number of radiosensitive cells in the brain and bone marrow.
Pulsed X-ray irradiation at a clinical dose level is sufficient to elicit behavioral changes without reducing the number of radiosensitive cells in the brain and bone marrow.
Source:
Comparisons
Source-backed strengths
The cited study reported that Ce:GAGG effectively drove both excitatory and inhibitory opsins, specifically ChRmine and GtACR1. Injectable microparticles supported in vivo bidirectional modulation of dopamine-neuron-dependent place preference in freely moving mice, and pulsed X-ray irradiation at a clinical dose level elicited behavioral effects without reducing radiosensitive cell numbers in brain and bone marrow.
Ranked Citations
- 1.
Derived from 4 linked claims and 2 validation observations. Example evidence: Here we show that a yellow-emitting inorganic scintillator, Ce-doped Gd3(Al,Ga)5O12 (Ce:GAGG), can effectively activate red-shifted excitatory and inhibitory opsins, ChRmine and GtACR1, respectively.