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CAS 314728-85-3 Sunifiram AMPAkine Memory Enhancement Research
Brief Introduction
Brief Introduction
Sunifiram (development code: DM-235) is a novel pyrrolidone-type nootropic drug structurally related to Piracetam, but after molecular optimization, it is no longer classified as a racetam but rather as a piperazine alkaloid derivative . Sunifiram is structurally related to both unifiram (DM-232) and sapunifiram (MN-19), as all three molecules are piperazine alkaloids . In terms of anti-amnesic potential, Sunifiram exhibits four orders of magnitude (10,000-fold) higher potency than Piracetam, with 0.1 mg/kg injections showing cognitive-enhancing effects comparable to 30 mg/kg Piracetam .
Key Scientific Value & Findings
Unique Dual Mechanism of Action: Sunifiram exerts its cognition-enhancing effects through synergistic modulation of NMDA and AMPA receptors. It acts on the glycine-binding site of NMDA receptors, activating downstream signaling pathways, which in turn enhances AMPA receptor phosphorylation and function . This "NMDA activation first, AMPA enhancement second" dual mechanism underlies its ultra-high potency.
Long-Term Potentiation Enhancement: In mouse hippocampal slices, 10-100 nM Sunifiram significantly enhances long-term potentiation (LTP) in a bell-shaped dose-response relationship, peaking at 10 nM . Sunifiram treatment also restores impaired hippocampal LTP in olfactory bulbectomized mice to control levels .
Intracellular Signaling Pathway Activation: Sunifiram exerts its effects through activation of specific intracellular signaling pathways:
CaMKII Pathway: Restores CaMKIIα (Thr-286) autophosphorylation and GluR1 (Ser-831) phosphorylation in the hippocampal CA1 region to control levels
PKCα Pathway: Improves PKCα (Ser-657) autophosphorylation and NR1 (Ser-896) phosphorylation
Src Kinase Activation: Enhances Src family (Tyr-416) activity with the same bell-shaped dose-response curve as LTP, peaking at 10 nM
Notably, Sunifiram does not affect CaMKIV (Thr-196) and ERK phosphorylation, indicating the specificity of its signaling pathways
Cholinergic System Modulation: Sunifiram injections at 0.01 mg/kg facilitate acetylcholine release in the rat prefrontal cortex, reaching approximately 200% of baseline within one hour of injection .
Broad Anti-Amnesic Effects: Sunifiram reduces amnesia induced by scopolamine, baclofen, diphenhydramine, and clonidine, with effective doses as low as 0.001 mg/kg (injected) and 0.01 mg/kg (oral) .
Alzheimer's Disease Research Potential: In olfactory bulbectomized mouse models, Sunifiram significantly improves spatial reference memory (Y-maze test) and short-term memory (novel object recognition task), suggesting its value in research on neurodegenerative diseases such as Alzheimer's disease .
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