Abstract
Tenascin is an extra cellular matrix glycoprotein which is distributed in the mesenchyme surrounding various organs during embryogenesis. It has also been demonstrated in some normal adult tissues and in the matrix of human tumours. The present study has been carried out to analyse the distribution of tenascin in non malignant and malignant skin disorders, in squamous cell carcinomas of the head and neck, in squamous cell carcinoma xenografts and in a squamous cell carcinoma cell line grown on collagen gel. Immunohistochemical localisation of tenascin was performed, using a monoclonal antibody specific for tenascin, by the indirect immunoperoxidase method with silver enhancement. Tenascin was heterogeneously distributed in the extra cellular matrix of squamous cell carcinomas and in squamous cell carcinoma xenografts. It was absent in basal cell carcinoma and in the squamous cell carcinoma cell line grown on collagen gel. The distribution of tenascin in squamous cell carcinoma and basal cell carcinoma is discussed in relation to tumour invasion and differentiation.
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