Molecular triggers of migraine aura: A systematic review of human pharmacological provocation studies
Abstract
Background Migraine aura reflects transient neurological disturbances attributed to cortical spreading depolarization (CSD), yet the upstream molecular events that promote or precipitate this phenomenon remain uncertain. Human pharmacological provocation models provide a controlled approach to identifying endogenous signaling pathways capable of triggering aura and thereby clarifying their mechanistic role in migraine pathogenesis. Methods This systematic review was pre-registered in PROSPERO (ID: CRD420250636266) and conducted in accordance with the Synthesis Without Meta-Analysis (SWiM) guideline. PubMed and Embase were searched from database inception through January 1, 2026, without language restrictions, to identify experimental studies administering pharmacological agents to individuals with migraine with aura under controlled lab conditions. Two reviewers independently performed study selection, data extraction, and methodological assessment. Extracted variables included participant characteristics, study design, pharmacological trigger, dosing protocol, and the incidence, timing, and phenotype of provoked aura and headache. Because of substantial heterogeneity, findings were synthesized qualitatively. Results Fourteen studies met inclusion criteria, examining seven pharmacological agents: calcitonin gene-related peptide (CGRP), levcromakalim (ATP-sensitive potassium (KATP) channels opener), glyceryl trinitrate (GTN), sildenafil, cilostazol, endothelin-1, and…
How strong is the evidence?
Evidence Hub reads this as a systematic review, done in people. Its evidence level is 1 of 5 (Highest · pooled evidence). Pooled evidence from several studies sits at the top of the evidence pyramid. Reported size: 53 participants or records.
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