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Jagged1 in the portal vein mesenchyme regulates intrahepatic bile duct development: insights into Alagille syndrome
Open accessAbstract
Mutations in the human Notch ligand jagged 1 (JAG1) result in a multi-system disorder called Alagille syndrome (AGS). AGS is chiefly characterized by a paucity of intrahepatic bile ducts (IHBD), but also includes cardiac, ocular, skeletal, craniofacial and renal defects. The disease penetration and severity of the affected organs can vary significantly and the molecular basis for this broad spectrum of pathology is unclear. Here, we report that Jag1 inactivation in the portal vein mesenchyme (PVM), but not in the endothelium of mice, leads to the hepatic defects associated with AGS. Loss of Jag1 expression in SM22α-positive cells of the PVM leads to defective bile duct development beyond the initial formation of the ductal plate. Cytokeratin 19-positive cells are detected surrounding the portal vein, yet they are unable to form biliary tubes, revealing an instructive role of the vasculature in liver development. These findings uncover the cellular basis for the defining feature of AGS, identify mesenchymal Jag1-dependent and -independent stages of duct development, and provide mechanistic information for the role of Jag1 in IHBD formation.
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“Given that Notch signaling is a well-known inducer of mature DC fate in hepatoblasts (Hofmann et al., 2010; Sparks et al., 2010; Zong et al., 2009) and adult hepatocytes (Jeliazkova et al.”
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Metadata
- Authors
- Hofmann, J. J., Zovein, A. C., Koh, H., Radtke, F., Weinmaster, G., & Iruela-Arispe, M. L.
- Venue
- Development
- Publisher
- The Company of Biologists
- Published
- 2010-12-01
- Volume
- 137
- Issue
- 23
- Pages
- 4061-4072
- ISSN
- 0950-1991 (ISSN-L)
- 1477-9129
- OpenAlex
- W2149000174
- Cited by
- 249
- References
- 2
- FWCI
- 12.11
- Type
- journal article
- Language
- en
- Open access
- bronze
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