Basics of Immunohistochemistry

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Basics of Immunohistochemistry
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Basics of Immunohistochemistry Vivien Schacht, Johannes S. Kern  Journal of Investigative Dermatology  Volume 135, Issue 3, Pages 1-4 (March 2015) DOI: 10.1038/jid.2014.541 Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Schematic diagram of immunohistochemical techniques. (a) Direct method: the antigen-specific primary antibody is biotin labeled. Biotin binds to avidin/streptavidin. Color visualization is achieved through enzymatic reaction of horseradish peroxidase/alkaline phosphatase. (b) Indirect method: the antigen-specific primary antibody is unlabeled. The secondary, biotin-labeled antibody binds to primary antibody. Visualization is achieved accordingly through avidin/streptavidin and peroxidase/alkaline phosphatase complexes. The indirect method increases versatility because unlabeled primary antibodies can be used. (c) Indirect method with polymer chain detection system. Biotin and avidin/streptavidin are replaced by a labeled polymer chain, allowing for increased sensitivity and specificity. Journal of Investigative Dermatology 2015 135, 1-4DOI: (10.1038/jid.2014.541) Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 p16INK4a expression in human melanocytic tumors. p16INK4a expression was determined using immunohistochemical analysis of 20 benign nevi. (a) Representative examples of compound nevi stained with p16INK4a antibody (N20; Santa Cruz Biotechnology, Santa Cruz, CA) and positive cells detected using Permanent Red (Dako, Glostrup, Denmark). Bar = 50 μm. (b) The results for 15 compound and 5 dysplastic nevi are represented graphically. Horizontal bars indicate the median p16INK4a expression values. Reprinted from Scurr et al., 2011. Journal of Investigative Dermatology 2015 135, 1-4DOI: (10.1038/jid.2014.541) Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Immunohistochemical results in melanoma for selected BRAF V600E mutation–positive cases by DNA analyses. Case 9, a–c; case 10, d–f; case 20, g–i; papillary thyroid carcinoma control, j–l. (a, d, g, and j) Scanning magnification, hematoxylin and eosin (HandE). (b, e, h, and k) High power, HandE. (c, f, i, and l) Immunohistochemical stain with the anti-B-Raf (V600E) antibody. Reprinted with permission from Feller et al., 2013. Journal of Investigative Dermatology 2015 135, 1-4DOI: (10.1038/jid.2014.541) Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

Journal of Investigative Dermatology 2015 135, 1-4DOI: (10. 1038/jid Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

Journal of Investigative Dermatology 2015 135, 1-4DOI: (10. 1038/jid Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions