Abstract
Adhering junctions are generally grouped into desmosomes and adherens junctions based on their ultrastructural appearance and molecular composition. The armadillo-protein plakoglobin is common to both types of junctions, which are otherwise composed of mutually exclusive proteins. This view is based on observations in epithelial tissues but cannot easily be transferred to other cell types and tissues, as has become apparent during the last decade with the identification of new junctional proteins and the investigation of further non-epithelial junctions. Using a broad array of well-characterized specific antibodies against key junctional proteins in immunoblot reactions, high-resolution double-label laser scanning confocal microscopy, and immunoelectron microscopy, we describe a new type of adherens junction in human meningiomas and the human meningioma cell line HBL-52. This novel junction has a unique composition of proteins not found in any other tissue; it contains the desmosomal armadillo-protein plakophilin 2 together with the classic proteins of “epithelial” adherens junctions, i.e., E-cadherin (in some instances replaced by N-cadherin), alpha-catenin, beta-catenin, plakoglobin, and p120ctn. Ultrastructurally, it is formed between two or three neighboring cells. For pragmatic reasons, we suggest the name “meningeal junction” for this new structure.
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Acknowledgements
We gratefully acknowledge the interest and support of Prof. W.W. Franke and especially thank Dr. H. Spring for help with the confocal laser scanning microscopy, and E. Noffz for expert technical assistance (all German Cancer Research Center, Heidelberg, Germany). We are grateful to Prof. Kunze and Dr. P. Kremer (Department of Neurosurgery, University of Heidelberg, Germany) for providing some of the meningiomas and to Prof. H.D. Mennel (Phillips University of Marburg, Germany) for providing and classifying most of the tissue specimens.
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Akat, K., Bleck, C.K.E., Lee, YM.A. et al. Characterization of a novel type of adherens junction in meningiomas and the derived cell line HBL-52. Cell Tissue Res 331, 401–412 (2008). https://doi.org/10.1007/s00441-007-0512-5
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DOI: https://doi.org/10.1007/s00441-007-0512-5