Fig. 2.
Quantification and localization of degeneration-associated markers in sIBM compared to PM, DM and non-myopathic control muscle. (A) By quantitative (real-time) PCR from muscle tissue, an overexpression of the mRNA of the degenerative markers APP, desmin, NCAM, ubiquitin and αB-crystallin was observed in sIBM, PM and DM compared to non-myopathic controls. Symbols, analysis, statistics and plotting same as in Fig. 1B. (B) Fluorescent immunohistochemistry in representative muscle biopsy specimens of sIBM versus PM, DM and non-myopathic muscle, using an antibody for APP and an Alexa-594 (red)-labelled secondary antibody. Arrows point to muscle fibres that display overexpression of APP in sIBM, PM or DM (perifascicularly). Arrowheads denote an enhanced staining signal for APP in connective tissue in DM. The star indicates an upregulated expression of APP in capillaries of DM muscle. Photos taken by a CCD-camera using a conventional fluorescent microscope with a 20× objective. Scale bar represents 50 µm.