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Anti-calcification of bovine pericardium for bioprosthetic heart valves after surface modification with hyaluronic acid derivatives

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Abstract

Surface modification of glutaraldehyde fixed bovine pericardium (GFBP) was successfully carried out with hyaluronic acid (HA) derivatives. At first, HA was chemically modified with adipic dihydrazide (ADH) to introduce hydrazide functional group into the carboxyl group of HA backbone. Then, GFBP was surface modified by grafting HA-ADH to the free aldehyde groups on the tissue and the subsequent HA-ADH hydrogel coating. HA-ADH hydrogels could be prepared through selective crosslinking at low pH between hydrazide groups of HA-ADH and crosslinkers containing succinimmidyl moieties with minimized protein denaturation. When HA-ADH hydrogels were prepared at low pH of 4.8 in the presence of erythropoietin (EPO) as a model protein, EPO release was continued up to 85% of total amount of loaded EPO for 4 days. To the contrary, only 30% of EPO was released from HA-ADH hydrogels prepared at pH=7.4, which might be due to the denaturation of EPO during the crosslinking reaction. Because the carboxyl groups on the glucuronic acid residues are recognition sites for HA degradation by hyaluronidase, the HA-ADH hydrogels degraded more slowly than HA hydrogels prepared by the crosslinking reaction of divinyl sulfone with hydroxyl groups of HA. Following a two-week subcutaneous implantation in osteopontin-null mice, clinically significant levels of calcification were observed for the positive controls without any surface modification. However, the calcification of surface modified GFBP with HA-ADH and HA-ADH hydrogels was drastically reduced by more than 85% of the positive controls. The anti-calcification effect of HA surface modification was also confirmed by microscopic analysis of explan ted tissue after staining with Alizarin Red S for calcium, which followed the trend as observed with calcium quantification.

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  1. Sei Kwang Hahn

    Present address: Roche group, Chugai Pharmaceutical co. Fuji Gotemba Research Labs, 412-8513, Shizuoka, Japan

Authors and Affiliations

  1. Department of Bioengineering, University of Washington, Box 352255, 98195, Seattle, WA, USA

    Sei Kwang Hahn, Rachit Ohri & Cecilia M. Giachelli

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  1. Sei Kwang Hahn
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  2. Rachit Ohri
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Correspondence to Sei Kwang Hahn.

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Hahn, S.K., Ohri, R. & Giachelli, C.M. Anti-calcification of bovine pericardium for bioprosthetic heart valves after surface modification with hyaluronic acid derivatives. Biotechnol. Bioprocess Eng. 10, 218–224 (2005). https://doi.org/10.1007/BF02932016

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