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Controlled release of tetracycline from biodegradable beta-tricalcium phosphate composites


Luginbühl, Vera; Ruffieux, K; Hess, C; Reichardt, D; von Rechenberg, Brigitte; Nuss, Katja M (2010). Controlled release of tetracycline from biodegradable beta-tricalcium phosphate composites. Journal of Biomedical Materials Research. Part B: Applied Biomaterials, 92(2):341-352.

Abstract

For use in the prevention of bone infections, a novel controlled release system composed of beta-tricalcium phosphate (TCP) granules with biodegradable coatings incorporating the antibiotic drug tetracycline (TC) was developed. Six formulations using poly(D,L-lactide) and poly(D,L-lactide-co-glycolide) as coating materials to incorporate TC were prepared and tested in vitro and in vivo. Release of TC from TCP composites was dependent on the biodegradability of the used polymers and on physical-chemical interactions of TC with the polymer materials. Three characteristic release profiles were obtained: slow release lasting up to 67 days, intermediate release with 60% of the total dose released up to day 20, and fast release with a high initial burst and 90% of TC released within 4 days. Even though TC decomposition products had formed during in vitro release, no cytotoxic effects on osteoblast-like cells were observed. The biological activity of TC after incorporation into PL(G)A films was confirmed using a TC-repressible promoter system in genetically engineered Chinese Hamster Ovary (CHO) cells. TC-loaded TCP composites implanted in ovine cancellous bone defects showed good biocompatibility and new bone formation in the histological evaluation. No differences in the cellular reactions were seen between antibiotic-loaded composites and the control group. These experimental results indicate the potential of coated TCP composites to be used as local carrier system for controlled TC delivery with different release kinetics and good in vitro and in vivo biocompatibility.

Abstract

For use in the prevention of bone infections, a novel controlled release system composed of beta-tricalcium phosphate (TCP) granules with biodegradable coatings incorporating the antibiotic drug tetracycline (TC) was developed. Six formulations using poly(D,L-lactide) and poly(D,L-lactide-co-glycolide) as coating materials to incorporate TC were prepared and tested in vitro and in vivo. Release of TC from TCP composites was dependent on the biodegradability of the used polymers and on physical-chemical interactions of TC with the polymer materials. Three characteristic release profiles were obtained: slow release lasting up to 67 days, intermediate release with 60% of the total dose released up to day 20, and fast release with a high initial burst and 90% of TC released within 4 days. Even though TC decomposition products had formed during in vitro release, no cytotoxic effects on osteoblast-like cells were observed. The biological activity of TC after incorporation into PL(G)A films was confirmed using a TC-repressible promoter system in genetically engineered Chinese Hamster Ovary (CHO) cells. TC-loaded TCP composites implanted in ovine cancellous bone defects showed good biocompatibility and new bone formation in the histological evaluation. No differences in the cellular reactions were seen between antibiotic-loaded composites and the control group. These experimental results indicate the potential of coated TCP composites to be used as local carrier system for controlled TC delivery with different release kinetics and good in vitro and in vivo biocompatibility.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:05 Vetsuisse Faculty > Veterinary Clinic > Equine Department
05 Vetsuisse Faculty > Center for Applied Biotechnology and Molecular Medicine
Dewey Decimal Classification:570 Life sciences; biology
630 Agriculture
Scopus Subject Areas:Physical Sciences > Biomaterials
Physical Sciences > Biomedical Engineering
Language:English
Date:2010
Deposited On:24 Feb 2011 12:55
Last Modified:20 Nov 2020 15:33
Publisher:Wiley-Blackwell
ISSN:1552-4973
OA Status:Closed
Publisher DOI:https://doi.org/10.1002/jbm.b.31520
PubMed ID:19904817

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