Abstract
Ovine forestomach matrix (OFM) is a decellularized extracellular matrix (dECM) biomaterial that serves as a scaffold for remodeling damaged soft tissue. dECM biomaterials are used in a variety of clinical applications, and their regenerative capacity is encoded not only in their biophysical properties but also in their molecular diversity. In this study, the proteome of OFM was characterized via both targeted and global mass spectrometry (MS) with the use of heavy isotope labeled (SIL) internal standards. Proteins were identified following either chemical digestion or extraction using saline or guanidine hydrochloride, followed by high resolution size exclusion chromatography. Identified proteins were annotated using the matrisome database and molecular function using the gene ontology database. The characterization identified 153 unique matrisome proteins, including 25 collagens, 58 glycoproteins, 12 proteoglycans, 13 ECM affiliated proteins, 20 ECM regulators, and 23 secreted factors. This inventory represents a comprehensive array of matrix proteins that are retained in OFM after processing. The diversity of proteins identified may contribute to OFM's remodeling capacity in clinical applications.
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