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      Significance of Nano- and Microtopography for Cell-Surface Interactions in Orthopaedic Implants

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          Abstract

          Cell-surface interactions play a crucial role for biomaterial application in orthopaedics. It is evident that not only the chemical composition of solid substances influence cellular adherence, migration, proliferation and differentiation but also the surface topography of a biomaterial. The progressive application of nanostructured surfaces in medicine has gained increasing interest to improve the cytocompatibility and osteointegration of orthopaedic implants. Therefore, the understanding of cell-surface interactions is of major interest for these substances. In this review, we elucidate the principle mechanisms of nano- and microscale cell-surface interactions in vitro for different cell types onto typical orthopaedic biomaterials such as titanium (Ti), cobalt-chrome-molybdenum (CoCrMo) alloys, stainless steel (SS), as well as synthetic polymers (UHMWPE, XLPE, PEEK, PLLA). In addition, effects of nano- and microscaled particles and their significance in orthopaedics were reviewed. The significance for the cytocompatibility of nanobiomaterials is discussed critically.

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          Integrin signaling.

          E Ruoslahti, F R Giancotti, ZHANG YUEGANG (1999)
          Cells reside in a protein network, the extracellular matrix (ECM), which they secrete and mold into the intercellular space. The ECM exerts profound control over cells. The effects of the matrix are primarily mediated by integrins, a family of cell surface receptors that attach cells to the matrix and mediate mechanical and chemical signals from it. These signals regulate the activities of cytoplasmic kinases, growth factor receptors, and ion channels and control the organization of the intracellular actin cytoskeleton. Many integrin signals converge on cell cycle regulation, directing cells to live or die, to proliferate, or to exit the cell cycle and differentiate.
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            Molecular biomimetics: nanotechnology through biology.

            Mehmet Sarikaya, Candan Tamerler, Alex Jen … (2003)
            Proteins, through their unique and specific interactions with other macromolecules and inorganics, control structures and functions of all biological hard and soft tissues in organisms. Molecular biomimetics is an emerging field in which hybrid technologies are developed by using the tools of molecular biology and nanotechnology. Taking lessons from biology, polypeptides can now be genetically engineered to specifically bind to selected inorganic compounds for applications in nano- and biotechnology. This review discusses combinatorial biological protocols, that is, bacterial cell surface and phage-display technologies, in the selection of short sequences that have affinity to (noble) metals, semiconducting oxides and other technological compounds. These genetically engineered proteins for inorganics (GEPIs) can be used in the assembly of functional nanostructures. Based on the three fundamental principles of molecular recognition, self-assembly and DNA manipulation, we highlight successful uses of GEPI in nanotechnology.
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              Enhanced functions of osteoblasts on nanophase ceramics.

              T. Webster (2000)
              Select functions of osteoblasts (bone-forming cells) on nanophase (materials with grain sizes less than 100 nm) alumina, titania, and hydroxyapatite (HA) were investigated using in vitro cellular models. Compared to conventional ceramics, surface occupancy of osteoblast colonies was significantly less on all nanophase ceramics tested in the present study after 4 and 6 days of culture. Osteoblast proliferation was significantly greater on nanophase alumina, titania, and HA than on conventional formulations of the same ceramic after 3 and 5 days. More importantly, compared to conventional ceramics, synthesis of alkaline phosphatase and deposition of calcium-containing mineral was significantly greater by osteoblasts cultured on nanophase than on conventional ceramics after 21 and 28 days. The results of the present study provided the first evidence of enhanced long-term (on the order of days to weeks) functions of osteoblasts cultured on nanophase ceramics; in this manner, nanophase ceramics clearly represent a unique and promising class of orthopaedic/dental implant formulations with improved osseointegrative properties.
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                Author and article information

                Journal
                Journal ID (nlm-ta): J Biomed Biotechnol
                Journal ID (publisher-id): JBB
                Title: Journal of Biomedicine and Biotechnology
                Publisher: Hindawi Publishing Corporation
                ISSN (Print): 1110-7243
                ISSN (Electronic): 1110-7251
                Publication date (Print): 2007
                Publication date (Electronic): 30 September 2007
                Volume: 2007
                Electronic Location Identifier: 69036
                Affiliations
                1Department of Orthopaedics, Heinrich-Heine University Medical School, Moorenstrasse 5, 40225 Duesseldorf , Germany
                2Institute of Anatomy II, Heinrich-Heine University Medical School, Universitätsstrasse 1, 40225 Duesseldorf, Germany
                Author notes

                Recommended by Hicham Fenniri

                Article
                DOI: 10.1155/2007/69036
                PMC ID: 2233875
                PubMed ID: 18274618
                SO-VID: ec832697-7b41-41a8-a5b3-2b48040980d9
                Copyright © Copyright © 2007 M. Jäger et al.
                License:

                This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 18 March 2007
                Date accepted : 5 August 2007
                Categories
                Subject: Review Article

                ScienceOpen disciplines: Molecular medicine
                Data availability:
                ScienceOpen disciplines: Molecular medicine

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