Infrared microspectroscopic determination of collagen cross-links in articular cartilage. 2017

Lassi Rieppo, and Harri T Kokkonen, and Katariina A M Kulmala, and Vuokko Kovanen, and Mikko J Lammi, and Juha Töyräs, and Simo Saarakkala
University of Oulu, Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, Oulu, FinlandbUniversity of Eastern Finland, Department of Applied Physics, Kuopio, Finland.

Collagen forms an organized network in articular cartilage to give tensile stiffness to the tissue. Due to its long half-life, collagen is susceptible to cross-links caused by advanced glycation end-products. The current standard method for determination of cross-link concentrations in tissues is the destructive high-performance liquid chromatography (HPLC). The aim of this study was to analyze the cross-link concentrations nondestructively from standard unstained histological articular cartilage sections by using Fourier transform infrared (FTIR) microspectroscopy. Half of the bovine articular cartilage samples ( n = 27 ) were treated with threose to increase the collagen cross-linking while the other half ( n = 27 ) served as a control group. Partial least squares (PLS) regression with variable selection algorithms was used to predict the cross-link concentrations from the measured average FTIR spectra of the samples, and HPLC was used as the reference method for cross-link concentrations. The correlation coefficients between the PLS regression models and the biochemical reference values were r = 0.84 ( p < 0.001 ), r = 0.87 ( p < 0.001 ) and r = 0.92 ( p < 0.001 ) for hydroxylysyl pyridinoline (HP), lysyl pyridinoline (LP), and pentosidine (Pent) cross-links, respectively. The study demonstrated that FTIR microspectroscopy is a feasible method for investigating cross-link concentrations in articular cartilage.

UI MeSH Term Description Entries
D002358 Cartilage, Articular A protective layer of firm, flexible cartilage over the articulating ends of bones. It provides a smooth surface for joint movement, protecting the ends of long bones from wear at points of contact. Articular Cartilage,Articular Cartilages,Cartilages, Articular
D002417 Cattle Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor. Beef Cow,Bos grunniens,Bos indicus,Bos indicus Cattle,Bos taurus,Cow,Cow, Domestic,Dairy Cow,Holstein Cow,Indicine Cattle,Taurine Cattle,Taurus Cattle,Yak,Zebu,Beef Cows,Bos indicus Cattles,Cattle, Bos indicus,Cattle, Indicine,Cattle, Taurine,Cattle, Taurus,Cattles, Bos indicus,Cattles, Indicine,Cattles, Taurine,Cattles, Taurus,Cow, Beef,Cow, Dairy,Cow, Holstein,Cows,Dairy Cows,Domestic Cow,Domestic Cows,Indicine Cattles,Taurine Cattles,Taurus Cattles,Yaks,Zebus
D003094 Collagen A polypeptide substance comprising about one third of the total protein in mammalian organisms. It is the main constituent of SKIN; CONNECTIVE TISSUE; and the organic substance of bones (BONE AND BONES) and teeth (TOOTH). Avicon,Avitene,Collagen Felt,Collagen Fleece,Collagenfleece,Collastat,Dermodress,Microfibril Collagen Hemostat,Pangen,Zyderm,alpha-Collagen,Collagen Hemostat, Microfibril,alpha Collagen
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013055 Spectrophotometry, Infrared Spectrophotometry in the infrared region, usually for the purpose of chemical analysis through measurement of absorption spectra associated with rotational and vibrational energy levels of molecules. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) IR Spectra,Infrared Spectrophotometry,IR Spectras,Spectra, IR
D016018 Least-Squares Analysis A principle of estimation in which the estimates of a set of parameters in a statistical model are those quantities minimizing the sum of squared differences between the observed values of a dependent variable and the values predicted by the model. Rietveld Refinement,Analysis, Least-Squares,Least Squares,Analyses, Least-Squares,Analysis, Least Squares,Least Squares Analysis,Least-Squares Analyses,Refinement, Rietveld
D017127 Glycation End Products, Advanced A heterogeneous group of compounds derived from rearrangements, oxidation, and cross-linking reactions that follow from non-enzymatic glycation of amino groups in PROTEINS; LIPIDS; or NUCLEIC ACIDS. Their accumulation in vivo accelerates under hyperglycemic, oxidative, or inflammatory conditions. Heat also accelerates the formation of advanced glycation end products (AGEs) such seen with the browning of food during cooking. Advanced Glycation End Product,Advanced Glycation Endproduct,Advanced Maillard Reaction End Product,Glycated Lipids,Glycotoxins,Maillard Product,Maillard Reaction End Product,Maillard Reaction Product,Advanced Glycation End Products,Advanced Glycation Endproducts,Advanced Maillard Reaction End Products,Glycation Endproducts, Advanced,Maillard Products,Maillard Reaction End Products,Maillard Reaction Products,Glycation Endproduct, Advanced,Lipids, Glycated,Product, Maillard Reaction,Products, Maillard,Products, Maillard Reaction,Reaction Products, Maillard

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