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Senescent cholangiocytes release extracellular vesicles that alter target cell phenotype via the epidermal growth factor receptor
Author(s) -
Al Suraih Mohammed S.,
Trussoni Christy E.,
Splinter Patrick L.,
LaRusso Nicholas F.,
O’Hara Steven P.
Publication year - 2020
Publication title -
liver international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.873
H-Index - 110
eISSN - 1478-3231
pISSN - 1478-3223
DOI - 10.1111/liv.14569
Subject(s) - cholangiocyte , microbiology and biotechnology , biology , cancer research , mapk/erk pathway , immunology , signal transduction , endocrinology
Background & Aims Primary sclerosing cholangitis (PSC) is a chronic liver disease characterized by peribiliary inflammation and fibrosis. Cholangiocyte senescence is a prominent feature of PSC. Here, we hypothesize that extracellular vesicles (EVs) from senescent cholangiocytes influence the phenotype of target cells. Methods EVs were isolated from normal human cholangiocytes (NHCs), cholangiocytes from PSC patients and NHCs experimentally induced to senescence. NHCs, malignant human cholangiocytes (MHCs) and monocytes were exposed to 10 8 EVs from each donor cell population and assessed for proliferation, MAPK activation and migration. Additionally, we isolated EVs from plasma of wild‐type and Mdr2 −/− mice (a murine model of PSC), and assessed mouse monocyte activation. Results EVs exhibited the size and protein markers of exosomes. The number of EVs released from senescent human cholangiocytes was increased; similarly, the EVs in plasma from Mdr2 −/− mice were increased. Additionally, EVs from senescent cholangiocytes were enriched in multiple growth factors, including EGF. NHCs exposed to EVs from senescent cholangiocytes showed increased NRAS and ERK1/2 activation. Moreover, EVs from senescent cholangiocytes promoted proliferation of NHCs and MHCs, findings that were blocked by erlotinib, an EGF receptor inhibitor. Furthermore, EVs from senescent cholangiocytes induced EGF‐dependent Interleukin 1‐beta and Tumour necrosis factor expression and migration of human monocytes; similarly, Mdr2 −/− mouse plasma EVs induced activation of mouse monocytes. Conclusions The data continue to support the importance of cholangiocyte senescence in PSC pathogenesis, directly implicate EVs in cholangiocyte proliferation, malignant progression and immune cell activation and migration, and identify novel therapeutic approaches for PSC.