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Deprecated: Implicit conversion from float 314.4 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Biol+Chem 2016 ; 291 (26): 13789-801 Nephropedia Template TP
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Tumor Necrosis Factor-stimulated Gene 6 (TSG-6)-mediated Interactions with the Inter-?-inhibitor Heavy Chain 5 Facilitate Tumor Growth Factor ?1 (TGF?1)-dependent Fibroblast to Myofibroblast Differentiation* #MMPMID27143355
Martin J; Midgley A; Meran S; Woods E; Bowen T; Phillips AO; Steadman R
J Biol Chem 2016[Jun]; 291 (26): 13789-801 PMID27143355show ga
Fibroblasts are central to wound healing and fibrosis through TGF?1-triggered differentiation into contractile, ?-smooth muscle actin (?-SMA)-positive myofibroblasts. This is mediated by accumulation of a pericellular matrix of hyaluronan (HA) and the HA-dependent co-localization of CD44 with the epidermal growth factor receptor (EGFR). Interactions of HA with hyaladherins, such as inter-?-inhibitor (I?I) and tumor necrosis factor-stimulated gene-6 (TSG-6), are also essential for differentiation. This study investigated the mechanisms involved. TSG-6 and ?-SMA had different kinetics of induction by TGF?1, with TSG-6 peaking before ?-SMA. Si CD44 or EGFR inhibition prevented differentiation but had no effect on TSG-6 expression. TSG-6 was essential for differentiation, and mAb A38 (preventing I?I heavy chain (HC) transfer), HA-oligosaccharides, cobalt, or Si bikunin prevented TSG-6 activity, preventing differentiation. A38 also prevented the EGFR/CD44 association. This suggested that TSG-6/I?I HC interaction was necessary for the effect of TSG-6 and that HC stabilization of HA initiated the CD44/EGFR association. The newly described HC5 was shown to be the principal HC expressed, and its cell surface expression was prevented by siRNA inhibition of TSG-6 or bikunin. HC5 was released by hyaluronidase treatment, confirming its association with cell surface HA. Finally, HC5 knockdown by siRNA confirmed its role in myofibroblast differentiation. The current study describes a novel mechanism linking the TSG-6 transfer of the newly described HC5 to the HA-dependent control of cell phenotype. The interaction of HC5 with cell surface HA was essential for TGF?1-dependent differentiation of fibroblasts to myofibroblasts, highlighting its importance as a novel potential therapeutic target.