Abstract
The major component of localized cutaneous amyloids may be derived from cytokeratin (CK). However, the CK profiles of primary cutaneous amyloidosis (PCA) and secondary cutaneous amyloidosis (SCA) remain obscure. Paraffin-embedded sections of skin tissue from 64 patients with PCA, 111 with SCA and 3 with systemic amyloidosis were analyzed immunohistochemically using 12 different polyclonal or monoclonal anti-CK antibodies (34βE12, MNF116, LP34, AE1/AE3, anti-CK1, CK5, CK6, CK7, CK10, CK14, CK16 and CK17). In addition, frozen skin tissues from 12 patients with PCA were analyzed for comparison with the paraffin-embedded tissue. In all 64 PCA paraffin sections, the amyloid deposits were immunopositive for anti-CK5 antibody and 34βE12. In all 12 frozen sections of PCA, the amyloid deposits were immunopositive for anti-CK5 antibody, 34βE12, MNF116 and LP34, and seven (58.3%), three (25%) and one (8.3%) were immunopositive for anti-CK1, CK14, and CK10 antibodies, respectively. In all SCA sections, the amyloid deposits were immunopositive for CK5 and 34βE12. In addition, MNF116 immunolabeled amyloids of all sections from patients with basal cell carcinoma and trichoepithelioma, and MNF116 and LP34 immunolabeled amyloids of sections from patients with porokeratosis. Our results indicate that CK5 is the major CK present in the amyloid deposits of PCA and SCA, and “amyloid-K” is mainly derived from basal keratinocytes.
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Acknowledgements
The authors would like to thank Ms J.J. Shiue, R.M. Chiang and S.C. Ou for their technical assistance. This study was supported in part by the Taipei Veterans General Hospital (VGH 91-93), Executive Yuan, R.O.C.
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Chang, Y.T., Liu, H.N., Wang, W.J. et al. A study of cytokeratin profiles in localized cutaneous amyloids. Arch Dermatol Res 296, 83–88 (2004). https://doi.org/10.1007/s00403-004-0474-3
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DOI: https://doi.org/10.1007/s00403-004-0474-3