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      An Effective Translation: The Development of Hyaluronan-Based Medical Products From the Physicochemical, and Preclinical Aspects

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          Abstract

          This review shows the steps toward material selection focalized on the design and development of medical devices based on hyaluronan (HA). The selection is based on chemical and mechanical properties, biocompatibility, sterilization, safety, and scale-up costs. These facts play a vital role in the industrialization process. Approved medical devices containing-HA are illustrated to identify key parameters. The first part of this work involves the steps toward a complete characterization of chemical and mechanical aspects, reproducibility of the processes and scale up. In a second stage, we aimed to describe the preclinical in vitro and in vivo assays and selected examples of clinical trials. Furthermore, it is important to keep in mind the regulatory affairs during the research and development (R&D) using standardization (ISO standards) to achieve the main goal, which is the functionality and safety of the final device. To keep reproducible experimental data to prepare an efficient master file for the device, based on quality and recorded manufacturing data, and a rigorous R&D process may help toward clinical translation. A strong debate is still going on because the denominated basic research in HA field does not pay attention to the purity and quality of the raw materials used during the development. So that, to achieve the next generation of devices is needed to overcome the limitations of state of art in terms of efficacy, biodegradability, and non-toxicity.

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          Immune responses to implants - a review of the implications for the design of immunomodulatory biomaterials.

          A key for long-term survival and function of biomaterials is that they do not elicit a detrimental immune response. As biomaterials can have profound impacts on the host immune response the concept emerged to design biomaterials that are able to trigger desired immunological outcomes and thus support the healing process. However, engineering such biomaterials requires an in-depth understanding of the host inflammatory and wound healing response to implanted materials. One focus of this review is to outline the up-to-date knowledge on immune responses to biomaterials. Understanding the complex interactions of host response and material implants reveals the need for and also the potential of "immunomodulating" biomaterials. Based on this knowledge, we discuss strategies of triggering appropriate immune responses by functional biomaterials and highlight recent approaches of biomaterials that mimic the physiological extracellular matrix and modify cellular immune responses. Copyright © 2011 Elsevier Ltd. All rights reserved.
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            Hyaluronic acid: A key molecule in skin aging

            Skin aging is a multifactorial process consisting of two distinct and independent mechanisms: intrinsic and extrinsic aging. Youthful skin retains its turgor, resilience and pliability, among others, due to its high content of water. Daily external injury, in addition to the normal process of aging, causes loss of moisture. The key molecule involved in skin moisture is hyaluronic acid (HA) that has unique capacity in retaining water. There are multiple sites for the control of HA synthesis, deposition, cell and protein association and degradation, reflecting the complexity of HA metabolism. The enzymes that synthesize or catabolize HA and HA receptors responsible for many of the functions of HA are all multigene families with distinct patterns of tissue expression. Understanding the metabolism of HA in the different layers of the skin and the interactions of HA with other skin components will facilitate the ability to modulate skin moisture in a rational manner.
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              Recent advances in hyaluronic acid hydrogels for biomedical applications

              Hyaluronic acid (HA) is widely used in the design of engineered hydrogels, due to its biofunctionality, as well as numerous sites for modification with reactive groups. There are now widespread examples of modified HA macromers that form either covalent or physical hydrogels through crosslinking reactions such as with click chemistry or supramolecular assemblies of guest-host pairs. HA hydrogels range from relatively static matrices to those that exhibit spatiotemporally dynamic properties through external triggers like light. Such hydrogels are being explored for the culture of cells in vitro, as carriers for cells in vivo, or to deliver therapeutics, including in an environmentally responsive manner. The future will bring new examples of HA hydrogels due to the synthetic diversity of HA.
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                Author and article information

                Contributors
                Journal
                Front Bioeng Biotechnol
                Front Bioeng Biotechnol
                Front. Bioeng. Biotechnol.
                Frontiers in Bioengineering and Biotechnology
                Frontiers Media S.A.
                2296-4185
                17 May 2018
                2018
                : 6
                : 62
                Affiliations
                [1] 1Department of Research and Development, Contipro a.s. , Dolní Dobrouč, Czechia
                [2] 2Free Radical Pathophysiology, Institute of Biophysics of the Czech Academy of Sciences , Brno, Czechia
                [3] 3International Clinical Research Center, St. Anne's University Hospital Brno , Brno, Czechia
                Author notes

                Edited by: Amir Ghaemmaghami, University of Nottingham, United Kingdom

                Reviewed by: Jennifer Patterson, KU-Leuven, Belgium; Pinar Yilgor Huri, Ankara University, Turkey

                *Correspondence: Gloria Huerta-Ángeles huerta-angeles@ 123456contipro.com ; huertang77@ 123456gmail.com

                This article was submitted to Biomaterials, a section of the journal Frontiers in Bioengineering and Biotechnology

                Article
                10.3389/fbioe.2018.00062
                5966713
                29868577
                8e782874-3233-4771-95ec-edccdab8a8ae
                Copyright © 2018 Huerta-Ángeles, Nešporová, Ambrožová, Kubala and Velebný.

                This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

                History
                : 23 February 2018
                : 27 April 2018
                Page count
                Figures: 1, Tables: 3, Equations: 0, References: 126, Pages: 13, Words: 11725
                Funding
                Funded by: Ministry of Education, Youth and Science 10.13039/501100003335
                Award ID: LQ1605
                Categories
                Bioengineering and Biotechnology
                Review

                hyaluronan,chemical modification,cross-linked,hydrogel,preclinical data,clinical data,fda,risk management

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