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mike michaelides

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@mikelides

translational neuroscience/pharmacology/molecular imaging/neuromodulation/drug discovery/synthetic bio all activity reflects personal views
Joined April 2015
520 Following 992 Followers 713 Posts

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mike michaelides Verified account @mikelides
Congrats!! @zenbrainest
mike michaelides Verified account @mikelides 4d
A major milestone for Chemogenetics. DREADD technology demonstrates therapeutic efficacy in humans.

A new study published today in NEJM demonstrates preliminary safety and therapeutic benefit from DREADD-based chemogenetic treatment of refractory epilepsy, marking an extraordinary milestone for neuroscience and precision medicine.

nejm.org/doi/full/10.10…

The approach combines targeted AAV gene delivery at the epileptogenic locus with very low, subthreshold doses of clozapine to activate engineered DREADD receptors and modulate neuronal activity.

Congratulations to Bryan Roth, whose pioneering discovery of DREADDs made this field possible, and to the investigators of the NEJM study for bringing this technology to patients.

This achievement has a particularly meaningful connection to our work published in Science Magazine in 2017.

science.org/doi/10.1126/sc…

We showed that clozapine, rather than CNO itself, is the active mediator of DREADD activation in vivo and proposed that subthreshold doses of clozapine could be used to activate DREADDs in humans, anticipating a practical path toward clinical translation.

At the time, many in the scientific community viewed these findings primarily as relevant to the design of preclinical DREADD experiments. We saw a much broader opportunity, translating Chemogenetics into human therapeutics. Nearly a decade later, that vision is now becoming a reality.

Our 2017 study was supported by the research funding through the National Institutes of Health (NIH) and The National Institute on Drug Abuse (NIDA), a prime example of how fundamental basic research can ultimately enable transformative clinical applications.

This is an exciting beginning, but larger, well-controlled studies are essential to establish the magnitude and durability of therapeutic benefit and long-term safety.

Chemogenetics is moving beyond an experimental neuroscience tool toward a potentially transformative neuroscience platform. We are only beginning to realize its potential.
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mike michaelides Verified account @mikelides
A major milestone for Chemogenetics. DREADD technology demonstrates therapeutic efficacy in humans.

A new study published today in NEJM demonstrates preliminary safety and therapeutic benefit from DREADD-based chemogenetic treatment of refractory epilepsy, marking an extraordinary milestone for neuroscience and precision medicine.

nejm.org/doi/full/10.10…

The approach combines targeted AAV gene delivery at the epileptogenic locus with very low, subthreshold doses of clozapine to activate engineered DREADD receptors and modulate neuronal activity.

Congratulations to Bryan Roth, whose pioneering discovery of DREADDs made this field possible, and to the investigators of the NEJM study for bringing this technology to patients.

This achievement has a particularly meaningful connection to our work published in Science Magazine in 2017.

science.org/doi/10.1126/sc…

We showed that clozapine, rather than CNO itself, is the active mediator of DREADD activation in vivo and proposed that subthreshold doses of clozapine could be used to activate DREADDs in humans, anticipating a practical path toward clinical translation.

At the time, many in the scientific community viewed these findings primarily as relevant to the design of preclinical DREADD experiments. We saw a much broader opportunity, translating Chemogenetics into human therapeutics. Nearly a decade later, that vision is now becoming a reality.

Our 2017 study was supported by the research funding through the National Institutes of Health (NIH) and The National Institute on Drug Abuse (NIDA), a prime example of how fundamental basic research can ultimately enable transformative clinical applications.

This is an exciting beginning, but larger, well-controlled studies are essential to establish the magnitude and durability of therapeutic benefit and long-term safety.

Chemogenetics is moving beyond an experimental neuroscience tool toward a potentially transformative neuroscience platform. We are only beginning to realize its potential.
www.nejm.org Chemogenetic Neuromodulation for Refractory Epilepsy | NEJM In three patients with refractory epilepsy, hippocampal chemogenetic therapy plus low-dose clozapine was associated with a mean seizure-frequency reduction of 92.6%. Adverse events were grade 1 or 2.
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mike michaelides Verified account @mikelides
The long-standing view that ketamine is simply an NMDA receptor antagonist has been progressively and fundamentally reshaped by a series of recent studies that have collectively redefined our understanding of how ketamine and its enantiomers act therapeutically but also why it produces reinforcement and has liability for misuse and addiction.

Excited to share this News & Views (rdcu.be/fBIc8) written with @jorgh82 and published yesterday in @NatureSMB on the recent work of Qianru Jiang, Tao Che and colleagues who showed that ketamine (as well as PCP) can bind directly within the orthosteric pockets of both mu and kappa opioid receptors.

The Jiang et al. findings, taken together with other recent studies support a bifunctional model in which NMDA and opioid receptor signaling may work together to shape ketamine's antidepressant, analgesic, dissociative, and reinforcing effects.

Understanding how these systems converge could inform the development of next-generation treatments that preserve therapeutic benefits while reducing the risks of misuse and adverse effects.
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mike michaelides Verified account @mikelides
Of note, all these trials use clozapine and likely sub-threshold doses, as the DREADD agonist which we first proposed for human applications in 2017 when we showed that converted clozapine activates CNS DREADDs in vivo. Using clozapine addresses the drug component but other obstacles like delivery, transduction, longitudinal expression, target engagement, etc. remain. Accounting for and addressing patient heterogeneity in disease makeup and treatment response are other major challenges as chemogenetic therapies, regardless of which actuators (DREADDs or PSAMs) are employed, would comprise a personalized n of 1 treatment approach.

irp.nih.gov/accomplishment…

pubmed.ncbi.nlm.nih.gov/28774929/
BryanRoth Verified account @zenbrainest Aug 14
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mike michaelides Verified account @mikelides
New paper describing the generation of a dual recombinase ZnT3 mouse and its use to reveal a novel synaptic zinc-mediated thalamocortical pathway. Thank you my friend @AcousticThanos and @KonceptualKumar for the wonderful collaboration! With @osolca @eventrig @falloncurryy
Paper alert: New transgenic mouse - Auditory thalamus - Synaptic Zinc - Cortical PT neurons - NMDAR modulation. Excellent collaboration with my friend @mikelides @KonceptualKumar . science.org/doi/10.1126/sc…
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