Cell type heterogeneity of intermediate filament expression in epithelia of the human pituitary gland |
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Authors: | M. Kasper P. Stosiek G. N. P. van Muijen R. Moll |
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Affiliation: | (1) Institute of Pathology, District Hospital Görlitz, Girbigsdorfer Strasse 1-3, DDR-8900 Görlitz, German Democratic Republic;(2) Department of Pathology, Sint Radboudziekhuis, Geert Grooteplein zuid 24, 6525 GA Nijmegen, The Netherlands;(3) Institute of Pathology, University of Mainz, Langenbeckstrasse 1, D-6500 Mainz, Federal Republic of Germany |
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Abstract: | Summary In the present study we have localized immunohistochemically the intermediate filament proteins of the human pituitary gland (adenohypophysis, pars intermedia and pars tuberalis) by an indirect immunoperoxidase technique or by double immunofluorescence methods and analysed the individual cytokeratin polypeptides using two-dimensional gel electrophoresis. We found that the expression of cytokeratins in different epithelial cells of the human anterior pituitary gland was heterogeneous. Whereas the endocrine cells only expressed cytokeratins 8 and 18, the folliculo-stellate cells exhibited a reactivity for cytokeratins 7, 8, 18 and 19 as well as for GFAP and vimentin. The squamous epithelial cells of the pars tuberalis and the Ratke's cysts showed a more complex cytokeratin pattern of both squamous and simple type. Whereas in many cystic epithelial cells including the pseudo-follicles a triple expression of cytokeratin, vimentin and GFAP could be observed, only some basal cells of squamous epithelial nests coexpressed cytokeratin and vimentin. The differences in the intermediate filament protein distribution are discussed in the light of embryological relationships of the different parts of the human pituitary gland. |
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