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2017 ; 7
(1
): 1210
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Sulfated Hyaluronan Derivatives Modulate TGF-?1:Receptor Complex Formation:
Possible Consequences for TGF-?1 Signaling
#MMPMID28446792
Koehler L
; Samsonov S
; Rother S
; Vogel S
; Köhling S
; Moeller S
; Schnabelrauch M
; Rademann J
; Hempel U
; Pisabarro MT
; Scharnweber D
; Hintze V
Sci Rep
2017[Apr]; 7
(1
): 1210
PMID28446792
show ga
Glycosaminoglycans are known to bind biological mediators thereby modulating
their biological activity. Sulfated hyaluronans (sHA) were reported to strongly
interact with transforming growth factor (TGF)-?1 leading to impaired bioactivity
in fibroblasts. The underlying mechanism is not fully elucidated yet. Examining
the interaction of all components of the TGF-?1:receptor complex with sHA by
surface plasmon resonance, we could show that highly sulfated HA (sHA3) blocks
binding of TGF-?1 to its TGF-? receptor-I (T?R-I) and -II (T?R-II). However,
sequential addition of sHA3 to the T?R-II/TGF-?1 complex led to a significantly
stronger recruitment of T?R-I compared to a complex lacking sHA3, indicating that
the order of binding events is very important. Molecular modeling suggested a
possible molecular mechanism in which sHA3 could potentially favor the
association of T?R-I when added sequentially. For the first time bioactivity of
TGF-?1 in conjunction with sHA was investigated at the receptor level. T?R-I and,
furthermore, Smad2 phosphorylation were decreased in the presence of sHA3
indicating the formation of an inactive signaling complex. The results contribute
to an improved understanding of the interference of sHA3 with TGF-?1:receptor
complex formation and will help to further improve the design of functional
biomaterials that interfere with TGF-?1-driven skin fibrosis.