Unifying mechanism for different fibrotic diseases

G Wernig, SY Chen, L Cui… - Proceedings of the …, 2017 - National Acad Sciences
G Wernig, SY Chen, L Cui, C Van Neste, JM Tsai, N Kambham, H Vogel, Y Natkunam…
Proceedings of the National Academy of Sciences, 2017National Acad Sciences
Fibrotic diseases are not well-understood. They represent a number of different diseases
that are characterized by the development of severe organ fibrosis without any obvious
cause, such as the devastating diseases idiopathic pulmonary fibrosis (IPF) and
scleroderma. These diseases have a poor prognosis comparable with endstage cancer and
are uncurable. Given the phenotypic differences, it was assumed that the different fibrotic
diseases also have different pathomechanisms. Here, we demonstrate that many endstage …
Fibrotic diseases are not well-understood. They represent a number of different diseases that are characterized by the development of severe organ fibrosis without any obvious cause, such as the devastating diseases idiopathic pulmonary fibrosis (IPF) and scleroderma. These diseases have a poor prognosis comparable with endstage cancer and are uncurable. Given the phenotypic differences, it was assumed that the different fibrotic diseases also have different pathomechanisms. Here, we demonstrate that many endstage fibrotic diseases, including IPF; scleroderma; myelofibrosis; kidney-, pancreas-, and heart-fibrosis; and nonalcoholic steatohepatosis converge in the activation of the AP1 transcription factor c-JUN in the pathologic fibroblasts. Expression of the related AP1 transcription factor FRA2 was restricted to pulmonary artery hypertension. Induction of c-Jun in mice was sufficient to induce severe fibrosis in multiple organs and steatohepatosis, which was dependent on sustained c-Jun expression. Single cell mass cytometry revealed that c-Jun activates multiple signaling pathways in mice, including pAkt and CD47, which were also induced in human disease. αCD47 antibody treatment and VEGF or PI3K inhibition reversed various organ c-Jun–mediated fibroses in vivo. These data suggest that c-JUN is a central molecular mediator of most fibrotic conditions.
National Acad Sciences