YKL-40, a member of 'mammalian chitinase-like proteins', is secreted by macrophages, neutrophils, chondrocytes, endothelial-, vascular smooth muscle-, and cancer cells. High serum YKL-40 is a biomarker of poor prognosis in patients with cancer, inflammation and increased tissue remodelling. High YKL-40 protein expression assessed by immunohistochemistry is found in breast carcinomas associated with short disease-free survival and in glioblastomas with increased resistance to radiotherapy and decreased overall survival. In this chapter we describe the methods for the detection of (1) YKL-40 protein expression in human tissues (using immunohistochemistry) and cell cultures (using immunocytochemistry); (2) YKL-40 mRNA expression in human tissues (using in situ hybridization and Polymerase Chain Reaction); and (3) YKL-40 protein concentrations in serum or plasma (using Enzyme-Linked ImmunoSorbent Assay).
CITATION STYLE
Roslind, A., & Johansen, J. S. (2009). YKL-40: a novel marker shared by chronic inflammation and oncogenic transformation. Methods in Molecular Biology (Clifton, N.J.), 511, 159–184. https://doi.org/10.1007/978-1-59745-447-6_7
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