Transfected Saos-2 cells overexpressing phosphoinositidase C β1 isoform accumulate it within the nucleus

Sandra Marmiroli, Nicoletta Zini, Alberto Bavelloni, Irene Faenza, Andrea Ognibene, Nadir M. Maraldi

Research output: Contribution to journalArticlepeer-review


The subcellular partitioning of the phosphoinositidase C (PIG) isoforms involved in signal transduction, with the selective localization of the PIC β1 isoform in the nucleus, represents a crucial aspect of the complex mechanism of cell response to agonists. In order to further elucidate this phenomenon, we utilized human osteosarcoma Saos-2 cells, transfected with the cDNA for rat PIC β1. In the cells overexpressing this isoform, immunocytochemical analyses at the electron microscope level reveal an increased synthesis at the cytoplasm and a significant accumulation within the nucleus of the protein. Interestingly, the sites of intranuclear localization are, as in wild type cells, the interchromatin domains. These results indicate that the transfected cells maintain the capability of accumulating the enzyme within the nucleus and can be considered a model for functional studies on the nuclear signal transduction also in response to specific agonists.

Original languageEnglish
Pages (from-to)121-126
Number of pages6
JournalBiology of the cell / under the auspices of the European Cell Biology Organization
Issue number2-3
Publication statusPublished - 1996


  • Cell transfection
  • Immunocytochemistry
  • Osteosarcoma Saos-2 cells
  • Phosphoinositidase C β
  • Signal transduction

ASJC Scopus subject areas

  • Cell Biology

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