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2016 ; 6
(ä): 37885
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TGF beta receptor II interacting protein-1, an intracellular protein has an
extracellular role as a modulator of matrix mineralization
#MMPMID27883077
Ramachandran A
; Ravindran S
; Huang CC
; George A
Sci Rep
2016[Nov]; 6
(ä): 37885
PMID27883077
show ga
Transforming growth factor beta receptor II interacting protein 1 (TRIP-1), a
predominantly intracellular protein is localized in the ECM of bone. TRIP-1 lacks
a signal peptide, therefore, in this study, we provide evidence that
intracellular TRIP-1 can be packaged and exported to the ECM via exosomes.
Overexpression of TRIP-1 in MC3T3-E1 cells resulted in increased matrix
mineralization during differentiation and knockdown resulted in reduced effects.
In vivo function of TRIP-1 was studied by an implantation assay performed using
TRIP-1 overexpressing and knockdown cells cultured in a 3-dimmensional scaffold.
After 4 weeks, the subcutaneous tissues from TRIP-1 overexpressing cells showed
higher calcium and phosphate deposits, arranged collagen fibrils and increased
expression of Runx2 and alkaline phosphatase. Nucleation studies on demineralized
and deproteinized dentin wafer is a powerful tool to determine the functional
role of noncollagenous proteins in matrix mineralization. Using this system, we
provide evidence that TRIP-1 binds to Type-I collagen and can promote
mineralization. Surface plasmon resonance analysis demonstrated that TRIP-1 binds
to collagen with K(D)?=?48??M. SEM and TEM analysis showed that TRIP-1 promoted
the nucleation and growth of calcium phosphate mineral aggregates. Taken
together, we provide mechanistic insights of this intracellular protein in matrix
mineralization.