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2014 ; 369
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): ä Nephropedia Template TP
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Extracellular distribution of diffusible growth factors controlled by heparan
sulfate proteoglycans during mammalian embryogenesis
#MMPMID25349453
Matsuo I
; Kimura-Yoshida C
Philos Trans R Soc Lond B Biol Sci
2014[Dec]; 369
(1657
): ä PMID25349453
show ga
During mouse embryogenesis, diffusible growth factors, i.e. fibroblast growth
factors, Wnt, bone morphogenetic protein and Hedgehog family members, emanating
from localized areas can travel through the extracellular space and reach their
target cells to specify the cell fate and form tissue architectures in
coordination. However, the mechanisms by which these growth factors travel great
distances to their target cells and control the signalling activity as morphogens
remain an enigma. Recent studies in mice and other model animals have revealed
that heparan sulfate proteoglycans (HSPGs) located on the cell surface (e.g.
syndecans and glypicans) and in the extracellular matrix (ECM; e.g. perlecan and
agrin) play crucial roles in the extracellular distribution of growth factors.
Principally, the function of HSPGs depends primarily on the fine features and
localization of their heparan sulfate glycosaminoglycan chains.
Cell-surface-tethered HSPGs retain growth factors as co-receptors and/or
endocytosis mediators, and enzymatic release of HSPGs from the cell membrane
allows HSPGs to transport or move multiple growth factors. By contrast,
ECM-associated HSPGs function as a reservoir or barrier in a context-dependent
manner. This review is focused on our current understanding of the extracellular
distribution of multiple growth factors controlled by HSPGs in mammalian
development.