title: Tannic acid mimicking dendrimers as small intestine submucosa stabilizing nanomordants.
abstract: Chemical stabilization resulting in increased resistance to proteolytic degradation is one of the approaches in prevention of post-implantational aneurysm development in decellularized natural vascular scaffolds. Recently, tannic acid (TA) and tannic acid mimicking dendrimers (TAMD) have been suggested as potential stabilization agents for collagen and elastin. The aim of this work was to determine the stabilizing effects of TAMD on decellularized natural scaffolds. Vascular scaffolds fabricated from small intestine submucosa (SIS) and SIS plane sheets (Cook Biotech Inc.) were used. The biomechanical properties of the SIS vascular graft segments treated with TA and TAMD were tested. The effect of TAMD treatment on resistance to proteolytic degradation was evaluated by measuring biomechanical properties of TAMD stabilized and non-stabilized SIS specimens after incubation in collagenase solution. It was shown that treatment with TA as well as with TAMD increased the strength of tubular SIS as well as their resistance to proteolytic biodegradation manifested by preservation of biomechanical properties after collagenase treatment. Transmission electron microscopy demonstrated that treatment with TAMD increased the periodical pattern typical of collagen fiber ultrastructure as a result of the "mordant" effect. The possible collagen cross-linking effect of TAMD on SIS was investigated by differential scanning calorimetry (DSC). The treatment with TAMD induced a small, but detectable cross-linking effect, suggesting that TAMD do not establish extensive covalent cross links within the extracellular matrix but rather interact with collagen, thus rendering SIS scaffolds more resistant to proteolytic degradation.
authors.affiliation: Medical University of South Carolina, Charleston, SC 29425, USA.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Kasyanov
authors.forename: Jason
authors.initials: J
authors.lastname: Isenburg
authors.forename: Robert A
authors.initials: RA
authors.lastname: Draughn
authors.forename: Starr
authors.initials: S
authors.lastname: Hazard
authors.forename: Jason
authors.initials: J
authors.lastname: Hodde
authors.forename: Iveta
authors.initials: I
authors.lastname: Ozolanta
authors.forename: Modra
authors.initials: M
authors.lastname: Murovska
authors.forename: S Bart
authors.initials: SB
authors.lastname: Halkes
authors.forename: Ioannis
authors.initials: I
authors.lastname: Vrasidas
authors.forename: Rob M J
authors.initials: RM
authors.lastname: Liskamp
authors.forename: Roland J
authors.initials: RJ
authors.lastname: Pieters
authors.forename: Dan
authors.initials: D
authors.lastname: Simionescu
authors.forename: Roger R
authors.initials: RR
authors.lastname: Markwald
authors.forename: Vladimir
authors.initials: V
authors.lastname: Mironov
mesh_terms: D000783:Aneurysm / Q000517:prevention & control; D001672:Biocompatible Materials / Q000737:chemistry / Q000494:pharmacology; D002152:Calorimetry, Differential Scanning; D003094:Collagen / Q000378:metabolism; D017364:Collagenases / Q000378:metabolism; D050091:Dendrimers / Q000737:chemistry* / Q000494:pharmacology*; D004548:Elasticity; D004549:Elastin / Q000378:metabolism; D007421:Intestine, Small / Q000187:drug effects*; D049329:Nanostructures / Q000737:chemistry*; D013634:Tannins / Q000737:chemistry* / Q000494:pharmacology*; D013696:Temperature; D019737:Transplants / Q000009:adverse effects
chemical_list: D001672:Biocompatible Materials; D050091:Dendrimers; D013634:Tannins; D003094:Collagen; D004549:Elastin; D017364:Collagenases