Induction of collecting duct morphogenesis in vitro by heparin-binding epidermal growth factor-like growth factor.

Takemura T, Hino S, Kuwajima H, Yanagida H, Okada M, Nagata M, Sasaki S, Barasch J, Harris RC, Yoshioka K
J Am Soc Nephrol. 2001 12 (5): 964-972

PMID: 11316855 · DOI:10.1681/ASN.V125964

Heparin-binding epidermal growth factor-like growth factor (HB-EGF), a member of the epidermal growth factor family of growth factors, is synthesized as a membrane-an-chored precursor (proHB-EGF) that is capable of stimulating adjacent cells in a juxtacrine manner. ProHB-EGF is cleaved in a protein kinase C-dependent process, to yield the soluble form. It was observed that HB-EGF acts as a morphogen for the collecting duct system in developing kidneys. HB-EGF protein was expressed in the ureteric bud of embryonic kidneys. Cultured mouse ureteric bud cells (UBC) produced HB-EGF via protein kinase C activation. After stimulation with phorbol ester (12-O-tetradecanoylphorbol-13-acetate) or recombinant soluble HB-EGF, UBC cultured in three-dimensional collagen gels formed short tubules with varied abundant branches. When proHB-EGF-transfected UBC were stimulated with 12-O-tetradecanoylphorbol-13-acetate and cultured in collagen gels, they exhibited linear growth, forming long tubular structures with few branches at the time of appearance of proHB-EGF on the cell surface. The structures exhibited a strong resemblance to the early branching ureteric bud of embryonic kidneys. When UBC were cultured in the presence of transforming growth factor-beta and soluble HB-EGF, they formed long tubules and few branches, similar to the structures observed in proHB-EGF-transfected UBC. These cells exhibited apical-basolateral polarization and expression of the water channel aquaporin-2. These findings indicate that soluble HB-EGF and proHB-EGF induce branching tubulogenesis in UBC in different ways. Juxtacrine activation by proHB-EGF or the synergic action of soluble HB-EGF with transforming growth factor-beta is important for well balanced morphogenesis of the collecting duct system.

MeSH Terms (18)

Animals Base Sequence Cells, Cultured Collagen Culture Media DNA Primers Epidermal Growth Factor Gels Heparin-binding EGF-like Growth Factor Intercellular Signaling Peptides and Proteins In Vitro Techniques Kidney Tubules, Collecting Mice Morphogenesis RNA, Messenger Tetradecanoylphorbol Acetate Transfection Transforming Growth Factor beta

Connections (2)

This publication is referenced by other Labnodes entities: