Map3k3I441M knock-in mouse model of cerebral cavernous malformations

The Map3k3I441M knock-in mouse model reveals an age-dependent mechanism in cerebral cavernous malformation (CCM) pathogenesis, wherein PI3K pathway activation is required for lesion formation in adults but not juveniles. Notably, rapamycin treatment effectively inhibited lesions across age groups, underscoring mammalian target of rapamycin (mTOR) inhibition as a potential therapy. This commentary highlights mechanistic insights from the Map3k3I441M knock-in mouse model, emphasizing the age-dependent role of PI3K signaling in CCM formation. It discusses the potential synergy between MAP3K3 and PIK3CA mutations, explores the therapeutic potential of mTOR inhibition, and considers the potential influence of pre-conceptional environmental exposures on CCM susceptibility.