title: Essential Role of Lyn in Fibrosis.
abstract: Fibrotic disorders involve replacement of normal parenchyma with myofibroblasts, which deposit connective tissue, leading to obliteration of the function of the underlying organ. The treatment options are inadequate and reflect the fact that signaling targets in myofibroblasts are unknown. Here we identify the hyperactive Lyn signaling in myofibroblasts of patients with chronic pancreatitis-induced fibrosis. Lyn activation coexpress with markers of activated myofibroblasts, and is increased ~11-fold in chronic pancreatitis compared to normal tissue. Inhibition of Lyn with siRNA or INNO-406 leads to the substantial decrease of migration and proliferation of human chronic pancreatitis myofibroblasts in vitro, while leaving migration and proliferation of normal myofibroblasts only slightly affected. Furthermore, inhibition of Lyn prevents synthesis of procollagen and collagen in myofibroblasts in a mouse model of chronic pancreatitis-induced fibrosis. We conclude that Lyn, as a positive regulator of myofibroblast migration, proliferation, and collagen production, is a key target for preventing fibrosis.
authors.affiliation: Division of Gastroenterology, Department of Medicine, Cedars-Sinai Medical CenterLos Angeles, CA, USA; Department of Veterans AffairsLos Angeles, CA, USA; Department of Medicine, University of California, Los AngelesLos Angeles, CA, USA.
authors.forename: Hung
authors.initials: H
authors.lastname: Pham
authors.affiliation: Division of Gastroenterology, Department of Medicine, Cedars-Sinai Medical CenterLos Angeles, CA, USA; Department of Internal Medicine, University of BolognaBologna, Italy.
authors.forename: Chiara
authors.initials: C
authors.lastname: Birtolo
authors.affiliation: Division of Gastroenterology, Department of Medicine, Cedars-Sinai Medical Center Los Angeles, CA, USA.
authors.forename: Chintan
authors.initials: C
authors.lastname: Chheda
authors.affiliation: Department of Medicine, Institute of Stem Cell and Regenerative Medicine, University of Washington Seattle, WA, USA.
authors.forename: Wendy
authors.initials: W
authors.lastname: Yang
authors.affiliation: Division of Gastroenterology, Department of Medicine, Cedars-Sinai Medical Center Los Angeles, CA, USA.
authors.forename: Maria D
authors.initials: MD
authors.lastname: Rodriguez
authors.affiliation: Division of Gastroenterology, Department of Medicine, Cedars-Sinai Medical CenterLos Angeles, CA, USA; Department of Medicine, University of California, Los AngelesLos Angeles, CA, USA.
authors.forename: Sandy T
authors.initials: ST
authors.lastname: Liu
authors.affiliation: Division of Gastroenterology, Department of Medicine, Cedars-Sinai Medical CenterLos Angeles, CA, USA; Department of Internal Medicine, University of BolognaBologna, Italy.
authors.forename: Gabriele
authors.initials: G
authors.lastname: Gugliotta
authors.affiliation: Department of Veterans AffairsLos Angeles, CA, USA; Department of Medicine, University of California, Los AngelesLos Angeles, CA, USA.
authors.forename: Michael S
authors.initials: MS
authors.lastname: Lewis
authors.affiliation: Department of Medicine, Institute of Stem Cell and Regenerative Medicine, University of Washington Seattle, WA, USA.
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Cirulli
authors.affiliation: Division of Gastroenterology, Department of Medicine, Cedars-Sinai Medical CenterLos Angeles, CA, USA; Department of Veterans AffairsLos Angeles, CA, USA; Department of Medicine, University of California, Los AngelesLos Angeles, CA, USA.
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Pandol
authors.affiliation: Division of Gastroenterology, Department of Medicine, Cedars-Sinai Medical Center Los Angeles, CA, USA.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Ptasznik
keywords: Lyn; Src; fibrosis; pancreatitis