Perelman School of Medicine at the University of Pennsylvania

Kahn Lab

Cerebral Cavernous Malformations

Cerebral Cavernous Malformations (CCMs) are devastating but the mechanisms are not well defined.

CCMs cause stroke and seizure in young people, many of whom carry a mutant disease allele. Our studies build upon prior studies that defined a CCM-MEKK3-KLF2/4 signaling axis in endothelial cells that contribute to CCM disease. Recently, we have shown that gram negative bacteria in the gut microbiome further contribute to disease progression (Nature 2017, Science Translational Medicine 2019). Furthermore, degradation of the extracellular matrix by secreted proteases recruits normal, un-mutated cells to CCM lesions and exacerbates disease (Journal of Experimental Medicine 2020). Lastly, we have found a synergistic role for PI3K signaling in lesion formation in mice and humans (Nature 2021). Projects are now investigating other pathways that contribute to CCM lesion formation.

See the below recent publications related to this project:

PIK3CA and CCM mutations fuel cavernomas through a cancer-like mechanism

Ren et al. 2021, Nature

Cerebral cavernous malformations are driven by ADAMTS5 proteolysis of versican

Hong et al. 2020, Journal of Experimental Medicine

Distinct cellular roles for PDCD10 define a gut-brain axis in cerebral cavernous malformation

Tang et al. 2019, Science Translational Medicine

Endothelial TLR4 and the microbiome drive cerebral cavernous malformations

Tang et al. 2017, Nature

Cerebral cavernous malformations arise from endothelial gain of MEKK3-KLF2/4 signalling

Zhou and Tang et al. 2016, Nature