Version history

{
  "session_id": "sess-hyp-87b85c3b19fe",
  "round_number": 3,
  "agent_persona": "persona-domain_expert",
  "agent_backend": "llm",
  "action": "support",
  "content": "\n\n# Expert Assessment: Closed-Loop tACS Targeting EC-II SST Interneurons in Alzheimer's Disease\n\n## Translational Feasibility Analysis\n\n### 1. Target Druggability Assessment\n\n**SST as a molecular target** is well-characterized with five GPCR subtypes (SSTR1-5) and FDA-approved analogs (octreotide, pasireotide). However, the hypothesis operates at the *circuit level* rather than targeting SST signaling directly—the therapeutic lever is **modulating SST+ interneuron activity** to restore inhibitory tone.\n\n**Critical considerations:**\n- **Cell-type specificity** is the central druggability challenge. tACS lacks single-cell resolution; even closed-loop approaches cannot selectively recruit EC-II SST interneurons without affecting adjacent excitatory neurons and other inhibitory populations.\n- **Anatomical depth** poses a fundamental constraint—the entorhinal cortex lies 2-4 cm from the scalp surface, where current density falls by ~80-90%.\n- **Molecular pathways** connecting SST interneuron activity to tau propagation remain mechanistically underspecified. The claim that disinhibition \"allows\" tau propagation requires demonstrated causative links, not merely correlative disruption.\n\n| Target Component | Druggability Rating | Key Limitation |\n|------------------|---------------------|----------------|\n| SST receptor signaling | High | CNS penetration of analogs poor; systemic effects |\n| SST+ interneuron activity | Moderate | tACS lacks cell-type specificity |\n| EC-II microcircuit | Low | Anatomical inaccessibility |\n| Tau propagation pathway | Low | Mechanism undefined |\n\n### 2. Tool Compounds and Experimental Assets\n\n**Existing tools:**\n\n| Tool Category | Specific Agents | Translational Readiness |\n|---------------|-----------------|------------------------|\n| **Electrical stimulation** | tACS/t",
  "tokens_used": "455",
  "persona_id": "persona-domain_expert"
}