Volume 105, Issue 11 pp. 3006-3016
Original Article

Characterization of poly(L-glutamic acid)-grafted hyaluronan as a novel candidate medicine and biomedical device for intra-articular injection

Kazuaki Muramatsu

Corresponding Author

Kazuaki Muramatsu

Division of Life Science and Engineering, School of Science and Engineering, Tokyo Denki University, Ishizaka, Hatoyama-cho, Hiki-gun, Saitama, 350-0394 Japan

Correspondence to: Kazuaki Muramatsu; e-mail: [email protected]Search for more papers by this author
Yuya Tajima

Yuya Tajima

Division of Life Science and Engineering, School of Science and Engineering, Tokyo Denki University, Ishizaka, Hatoyama-cho, Hiki-gun, Saitama, 350-0394 Japan

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Rin Kaneko

Rin Kaneko

Division of Life Science and Engineering, School of Science and Engineering, Tokyo Denki University, Ishizaka, Hatoyama-cho, Hiki-gun, Saitama, 350-0394 Japan

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Yuta Yanagita

Yuta Yanagita

Division of Life Science and Engineering, School of Science and Engineering, Tokyo Denki University, Ishizaka, Hatoyama-cho, Hiki-gun, Saitama, 350-0394 Japan

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Hiroyuki Hirai

Hiroyuki Hirai

Division of Life Science and Engineering, School of Science and Engineering, Tokyo Denki University, Ishizaka, Hatoyama-cho, Hiki-gun, Saitama, 350-0394 Japan

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Nana Hiura

Nana Hiura

Division of Life Science and Engineering, School of Science and Engineering, Tokyo Denki University, Ishizaka, Hatoyama-cho, Hiki-gun, Saitama, 350-0394 Japan

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First published: 04 July 2017
Citations: 7

Abstract

A novel hyaluronan (HA) derivative, poly(L-glutamic acid)-grafted hyaluronan (PGA-g-HA), was synthesized to improve the durability of conventional HA products for intra-articular injection. The purpose of this study was to investigate the characteristics of the novel HA derivative in terms of viscoelasticity, degradation behavior, non-immunogenicity, and bioactivity using preliminary in vitro and in vivo experiments. The storage modulus (G′) and loss modulus (G″) of PGA-g-HA were similar to those of HA80 (approximately 8.0 × 105 Da) rather than those of original HA200 (approximately 2.0 × 106 Da). PGA-g-HA showed strong resistance against hyaluronidase hydrolysis compared to unmodified HA200. The immunogenicity resulting from grafting PGA to HA200 was not detected in bone marrow derived dendritic cells. The anti-inflammatory activity of PGA-g-HA was confirmed in IL-1β-stimulated chondrocytes. In addition, compared to unmodified HA200, the intra-articular injection of PGA-g-HA produced greater chondroprotective effects on a monoiodoacetic acid-induced model of rat knee osteoarthritis at two weeks after a single treatment. Therefore, PGA-g-HA is expected to be a promising medicine and biomedical device for intra-articular injection. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 3006–3016, 2017.

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