Source 1primary paper2019
Toolkit/Ce-doped Gd3(Al,Ga)5O12 (Ce:GAGG) microparticles
Ce-doped Gd3(Al,Ga)5O12 (Ce:GAGG) microparticles
Also known as: Ce:GAGG, 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 to convert X-ray irradiation into local optical output in vivo. In the cited study, this scintillation activated the red-shifted opsins ChRmine and GtACR1, enabling remote bidirectional control of neural activity.
Usefulness & Problems
Why this is useful
Ce:GAGG microparticles provide a delivery harness for deep-tissue optical stimulation without implanted light guides, because X-rays can be applied externally and converted locally into opsin-activating light. The reported system supported chronic implantation and behavioral modulation in freely moving mice.
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
This tool addresses the problem of delivering light to opsin-expressing cells in vivo when direct optical access is difficult. The cited work specifically used injectable scintillator microparticles to enable X-ray-driven activation and inhibition of midbrain dopamine neurons.
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.
Techniques
Structural CharacterizationTarget processes
No target processes tagged yet.
Implementation Constraints
The tool is implemented as injectable Ce:GAGG microparticles, described as yellow-emitting inorganic scintillators, used in conjunction with X-ray irradiation and expression of red-shifted opsins such as ChRmine or GtACR1. The cited study reports chronic implantation and use of pulsed X-ray irradiation at a clinical dose level, but the supplied evidence does not provide construct design, dosing, or fabrication details.
The supplied evidence is limited to a single cited study and focuses on ChRmine and GtACR1 in a mouse neural application. The evidence provided does not specify particle size, emission spectrum details, implantation procedure, long-term material stability, or performance across other cell types, tissues, or species.
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Observations
successMouseapplication demomouse
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 was 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 could effectively activate the red-shifted opsins ChRmine and GtACR1 under X-ray-induced scintillation.
Ce-doped Gd3(Al,Ga)5O12 (Ce:GAGG), could effectively activate red-shifted excitatory and inhibitory opsins, ChRmine and GtACR1, respectively.
Ce:GAGG microparticles were non-cytotoxic and biocompatible, allowing chronic implantation.
Ce:GAGG microparticles were 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 was 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-doped-gd3-al-ga-5o12-ce-gagg-microparticles
a yellow-emitting inorganic scintillator, Ce-doped Gd3(Al,Ga)5O12 (Ce:GAGG) ... Using injectable Ce:GAGG microparticles
Source:
activation capabilitysupports
Ce:GAGG could effectively activate the red-shifted opsins ChRmine and GtACR1 under X-ray-induced scintillation.
Ce-doped Gd3(Al,Ga)5O12 (Ce:GAGG), could effectively activate red-shifted excitatory and inhibitory opsins, ChRmine and GtACR1, respectively.
Source:
biocompatibilitysupports
Ce:GAGG microparticles were non-cytotoxic and biocompatible, allowing chronic implantation.
Ce:GAGG microparticles were non-cytotoxic and biocompatible, allowing for chronic implantation.
Source:
in vivo neural controlsupports
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 was sufficient to elicit behavioral changes without reducing the number of radiosensitive cells in the brain and bone marrow.
Source:
Comparisons
Source-backed strengths
The reported particles effectively activated both ChRmine and GtACR1 under X-ray-induced scintillation, supporting both excitation and inhibition. They were described as non-cytotoxic and biocompatible for chronic implantation, and pulsed X-ray irradiation at a clinical dose level elicited behavioral effects without reducing radiosensitive cell numbers in brain and bone marrow in the reported experiments.
Ranked Citations
- 1.