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Preparation of nuclear matrices from cultured cells subfractionation of nuclei in situ

, : Preparation of nuclear matrices from cultured cells subfractionation of nuclei in situ. Journal of Cell Biology 98(5): 1886-1894

Analyses of the different structural systems of the nucleus and the proteins associated with them pose many problems. Because these systems are largely overlapping, in situ localization studies that preserve the in vivo location of proteins and cellular structures often are not satisfactory. Biochemical cell fractionation may provide artifactual reuslts due to cross-contamination of extracts and structures. A method was developed that combines biochemical cell fractionation and in situ localization and leads to the preparation of a residual cellular skeleton (nuclear matrix and cytoskeletal elements) from cultured cells. This method's main feature is that cell fractionation is performed in situ. Structures not solubilized in a particular extraction step remain attached to the substrate and retain their morphology. Before and after each extraction step they can be analyzed for the presence and location of the protein under study by using immunological or cytochemical techniques. In this way the in vivo origin of a protein solubilized in a particular extraction step is determined. The solubilized protein then may be further characterized biochemically. To allow analyses of proteins associated with the residual cellular skeleton, conditions were developed for its solubilization that do not interfere with enzymatic and immunological studies.

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Accession: 006173593

PMID: 6725403

DOI: 10.2307/1610714

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