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JMD 2001, Vol. 3, No. 3
Copyright © 2001 American Society for Investigative Pathology & Association for Molecular Pathology

Laser-Assisted Microdissection of Membrane-Mounted Paraffin Sections for Polymerase Chain Reaction Analysis

Identification of Cell Populations Using Immunohistochemistry and in Situ Hybridization

Lise Mette Gjerdrum^*, Ilze Lielpetere, Lars Melholt Rasmussen^*, Knud Bendix^* and Stephen Hamilton-Dutoit^*

From the Institutes of Pathology, * Aarhus University Hospital, Aarhus, Denmark; and the Institute of Pathology, P. Stradins’ Clinical University Hospital, Riga, Latvia

Laser microbeam microdissection (LMM) is an increasingly important method for obtaining pure cell samples for genetic and proteomic analysis. Immunohistochemistry (IHC) and in situ hybridization (ISH) are useful techniques for targeting specific cell populations for microdissection but are difficult to apply with the tissue support membranes often used during LMM. Using detection of cytokeratins and Epstein-Barr virus gene products in head and neck carcinoma as a model, we describe optimized protocols for membrane and section preparation and for low temperature antigen retrieval that allow IHC and ISH to be used reliably on membrane mounted paraffin tissue sections. Visualization of cellular targets was markedly improved by staining and this could be further improved using a variety of optical media before microdissection. Tissue fragments thus stained were suitable for subsequent polymerase chain reaction analysis of extracted DNA using standard techniques. These IHC and ISH procedures are generally applicable and will be useful for detecting a wide range of antigens and nucleic acids in paraffin sections in conjunction with LMM.

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