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Radiolabeling and Quantification of Cellular Levels of Phosphoinositides by High Performance Liquid Chromatography-coupled Flow Scintillation
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Phosphoinositidase C beta 1 isoform expression is modulated by interferon alpha in Burkitt lymphoma cells

A Cataldi1, R Di Pietro, A Antonucci

  • 1Istituto di Morfologia Umana Normale, Facoltà di Medicina e Chirurgia, Chieti, Italy.

Cellular Signalling
|February 1, 1995
PubMed

Insights

Interferon treatment alters phosphoinositidase C (PIC) beta 1 expression in the nucleus of Burkitt lymphoma cells, suggesting distinct signal transduction pathways. This impacts the inositol lipid cycle, influencing cell proliferation.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Immunology

Background:

  • Phosphoinositidase C (PIC) enzymes play critical roles in cellular signaling pathways.
  • Interferon is known to modulate cellular processes, including proliferation and immune responses.
  • Understanding the localization and regulation of PIC isozymes is crucial for deciphering signal transduction.

Purpose of the Study:

  • To investigate the expression and localization of phosphoinositidase C (PIC) beta 1, gamma 1, and delta 1 isozymes in Burkitt lymphoma cells.
  • To determine the effect of interferon treatment on PIC isozyme expression and localization.
  • To elucidate the role of PIC isozymes in interferon-mediated signal transduction and antiproliferative effects.

Main Methods:

  • Western blotting and immunocytochemical analysis were employed.
  • Specific monoclonal antibodies against PIC beta 1, gamma 1, and delta 1 isozymes were used.
  • Control and interferon-treated Burkitt lymphoma cells were analyzed.

Main Results:

  • PIC beta 1 was primarily detected in the nucleus and showed transient modifications after interferon treatment.
  • PIC delta 1 was found only in the cytoplasm and appeared insensitive to interferon.
  • PIC gamma 1 was detected at low levels or not at all in both cytoplasmic and nuclear compartments.

Conclusions:

  • Interferon's antiproliferative effect may involve at least two distinct signal transduction pathways at cytoplasmic and nuclear levels.
  • The inositol lipid cycle, particularly through nuclear PIC beta 1 modulation, is implicated in interferon's action.
  • PIC beta 1's nuclear localization and regulation are key to understanding interferon's cellular effects.

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