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Lipid-dependent nuclear signalling: morphological and functional features

N M Maraldi1, L Cocco, S Capitani

  • 1Institute of Cytomorphology, C.N.R., Bologna, Italy.

Advances in Enzyme Regulation
|January 1, 1994
PubMed
Summary
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Nuclear lipid metabolism enzymes, including phosphoinositidase C (PIC) beta 1, are active in cell nuclei and respond to growth factors. Their nuclear localization suggests a role in cell signaling, proliferation, and differentiation.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Lipid metabolism enzymes, particularly kinases and phosphoinositidases C (PIC), are present and active within the cell nucleus.
  • These nuclear enzymes are responsive to external stimuli like growth factors.

Purpose of the Study:

  • To investigate the presence, activity, and subcellular localization of nuclear phosphoinositidase C (PIC) isoforms.
  • To explore the role of nuclear PIC in signal transduction pathways controlling cell proliferation and differentiation.

Main Methods:

  • Enzyme assays to measure kinase and PIC activity in isolated nuclei.
  • Electron microscope immunogold labeling to determine subcellular localization of PIC isoforms.
  • In situ nuclear matrix preparations and colocalization studies.

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Main Results:

  • Nuclear PIC beta 1 is activated by insulin-like growth factor I (IGF-I) in Swiss 3T3 cells, preceding protein kinase C (PKC) translocation.
  • PIC beta 1 activity decreases during erythroid differentiation in Friend cells.
  • Nuclear PIC isoforms are localized in interchromatin domains, associated with the inner nuclear matrix, not the nuclear pore-lamina complex.

Conclusions:

  • Nuclear PIC isoforms are strategically localized within the nucleus, suggesting a role in nuclear signal transduction.
  • The precise localization indicates a potential cross-talk between cytoplasmic and nuclear signaling pathways.
  • Nuclear lipid metabolism is implicated in the control of cell proliferation and differentiation.