Description
The skeptic raised concerns about P-glycoprotein inhibition toxicity, but the debate didn’t address how chronic enhancement of BBB penetration affects compensatory upregulation of alternative efflux systems. This knowledge gap is critical for long-term safety assessment of any BBB-targeting approach.
Source: Debate session sess_sda-2026-04-01-gap-008 (Analysis: sda-2026-04-01-gap-008)
Resolution criteria
Gap closes when: (1) A 4-week chronic P-gp inhibitor treatment study in rodents measures mRNA and protein levels of alternative efflux transporters (BCRP, MRP1, MRP2, MRP4) at the BBB by qPCR and western blot at weekly intervals; and (2) the study quantifies whether alternative transporter upregulation reduces CNS exposure of the co-administered cargo drug by >= 30% at the endpoint compared to week 1; and (3) the compensatory response is characterized in at least 2 independent animal models (e.g., rat and mouse). Deliverable: longitudinal transporter expression dataset and CNS drug exposure time-course with full statistical analysis.
Evidence summary
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