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Phua YL, Gilbert T, Combes A, Wilkinson L, Little MH. Neonatal vascularization and oxygen tension regulate appropriate perinatal renal medulla/papilla maturation. J Pathol 2016; 238:665-76. [PMID: 26800422 DOI: 10.1002/path.4690] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Revised: 11/21/2015] [Accepted: 01/11/2016] [Indexed: 11/11/2022]
Abstract
Congenital medullary dysplasia with obstructive nephropathy is a common congenital disorder observed in paediatric patients and represents the foremost cause of renal failure. However, the molecular processes regulating normal papillary outgrowth during the postnatal period are unclear. In this study, transcriptional profiling of the renal medulla across postnatal development revealed enrichment of non-canonical Wnt signalling, vascular development, and planar cell polarity genes, all of which may contribute to perinatal medulla/papilla maturation. These pathways were investigated in a model of papillary hypoplasia with functional obstruction, the Crim1(KST264/KST264) transgenic mouse. Postnatal elongation of the renal papilla via convergent extension was unaffected in the Crim1(KST264/KST264) hypoplastic renal papilla. In contrast, these mice displayed a disorganized papillary vascular network, tissue hypoxia, and elevated Vegfa expression. In addition, we demonstrate the involvement of accompanying systemic hypoxia arising from placental insufficiency, in appropriate papillary maturation. In conclusion, this study highlights the requirement for normal vascular development in collecting duct patterning, development of appropriate nephron architecture, and perinatal papillary maturation, such that disturbances contribute to obstructive nephropathy.
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Affiliation(s)
- Yu Leng Phua
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia.,Rangos Research Center, Children's Hospital of Pittsburgh of UPMC, Pittsburgh, PA, USA.,School of Medicine, Department of Pediatrics, Division of Nephrology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Thierry Gilbert
- Centre for Developmental Biology, University Paul Sabatier, Toulouse, France
| | - Alexander Combes
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia.,Department of Anatomy and Neuroscience, University of Melbourne, Melbourne, VIC, Australia.,Department of Pediatrics, University of Melbourne, Melbourne, VIC, Australia
| | - Lorine Wilkinson
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia
| | - Melissa H Little
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia.,Department of Pediatrics, University of Melbourne, Melbourne, VIC, Australia.,Murdoch Children's Research Institute, Royal Children's Hospital, Melbourne, VIC, Australia
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