Alteration of the basement membrane in human thyroid diseases: An immunohistochemical study of type IV collagen,laminin and heparan sulphate proteoglycan |
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Authors: | Ryohei Katoh Akira Muramatsu Akira Kawaoi Akira Komiyama Koichi Suzuki Akihiro Hemmi Shoichi Katayama |
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Affiliation: | (1) Department of Pathology, Yamanashi Medical University School of Medicine, 1110 Shimokato, Nakakoma-gun, 409-38 Yamanashi, Japan;(2) Department of Surgery, Kofu City Hospital, Kofu, Japan;(3) Department of Pathology, Kure Hospital, Kure, Japan |
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Abstract: | Basement membrane (BM) alteration in thyroid diseases was examined by immunohistochemistry using antibodies for the three major BM proteins: type IV collagen, laminin and heparan sulphate proteoglycan. Linear epithelial BMs surrounding follicles accompanied by vascular BMs forming loops, similar to those seen in the normal thyroid, were observed in Graves' disease and adenomatous goitre. Hashimoto's thyroiditis showed scant epithelial BMs as a result of follicle destruction. In follicular adenomas, development of epithelial BMs seemed to be related to follicle formation; well-developed epithelial BMs were frequently seen in normo- or largefollicular type, whereas trabecular or solid types revealed scant or poorly developed epithelial BMs. Lumpy accumulation of BM proteins was detected in hyalinizing trabecular adenomas. Papillary carcinomas revealed two different types of papillae; one type contained both epithelial and vascular BMs, and the other had only vascular BMs. Epithelial BMs in invasive areas of papillary carcinoma were distributed in an irregular, interrupted manner, and were completely absent in many foci. Anaplastic carcinomas showed scant or a total loss of epithelial BMs. These results suggest that alterations of BM in thyroid diseases clearly reflect their architectural variations, presumably in connection with their function and/or biological behaviour. |
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Keywords: | Basement Membrane Thyroid disease Type IV collagen Laminin Heparan sulphate proteoglycan |
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