Abstract
Proteoglycans (PGs) are non-fibrillar extracellular matrix (ECM) molecules composed by a protein core and glycosaminoglycan (GAG) chains. These molecules are present in all tissues playing essential structural, biomechanical, and biological roles. In addition, PGs can regulate cell behavior due to their versatility and ability to interact with other ECM molecules, growth factors, and cells. The distribution of PGs can be evaluated by histochemical and immunohistochemical methods. Histochemical methods aimed to provide a useful overview of the presence and distribution pattern of certain groups of PGs. In contrast, immunohistochemical procedures aimed the identification of highly specific target molecules. In this chapter we described Alcian Blue, Safranin O, and Toluidine Blue histochemical methods for the screening of PGs in tissue sections. Finally, we describe the immunohistochemical procedures for specific identification of PGs (decorin, biglycan, and versican) in formaldehyde-fixed and paraffin-embedded tissues.
Víctor Carriel and Sebastián San Martín share senior authorship.
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Acknowledgments
Methods described in this chapter were supported by the Spanish Plan Nacional de Investigación Científica, Desarrollo e Innovación Tecnológica, Ministerio de Economía y Competitividad (Instituto de Salud Carlos III), Grants No FIS PI17-0393, FIS PI20-0318 co-financed by the “Fondo Europeo de Desarrollo Regional ERDF-FEDER European Union”; Grant No P18-RT-5059 by Plan Andaluz de Investigación, Desarrollo e Innovación (PAIDI 2020), Consejería de Transformación Económica, Industria, Conocimiento y Universidades, Junta de Andalucía, España; and Grant A-CTS-498-UGR18 by Programa Operativo FEDER Andalucía 2014–2020, Universidad de Granada, Junta de Andalucía, España, co-funded by ERDF-FEDER, the European Union.
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Sánchez-Porras, D., Varas, J., Godoy-Guzmán, C., Bermejo-Casares, F., San Martín, S., Carriel, V. (2023). Histochemical and Immunohistochemical Methods for the Identification of Proteoglycans. In: Pellicciari, C., Biggiogera, M., Malatesta, M. (eds) Histochemistry of Single Molecules. Methods in Molecular Biology, vol 2566. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-2675-7_7
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DOI: https://doi.org/10.1007/978-1-0716-2675-7_7
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