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Rapid sequence-independent cellular response to oligodeoxynucleotides

L A Balakireva1, Z B Levashova, J Chroboczek

  • 1Novosibirsk Institute of Bioorganic Chemistry, Siberian Division of Academy of Sciences, Russian Federation. lis@genome.nsk.su

FEBS Letters
|January 6, 1997
PubMed
Summary
This summary is machine-generated.

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Oligodeoxynucleotides (OdN) trigger cellular signaling in L929 cells, impacting phospholipase C and protein kinase C (PKC) activity. OdN treatment reduces PKC activity and protein phosphorylation, independent of sequence.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Receptors for oligodeoxynucleotides (OdN) are present on L929 cell surfaces.
  • Understanding OdN receptor signaling is crucial for cellular communication studies.

Purpose of the Study:

  • To investigate the coupling of OdN receptors to cellular signal transduction pathways.
  • To determine the effects of phosphodiester OdN on phospholipase C and protein kinase C (PKC) activities in L929 fibroblasts.

Main Methods:

  • L929 fibroblasts were treated with phosphodiester oligodeoxynucleotides (OdN) of varying sequences.
  • Cellular phospholipase C and protein kinase C (PKC) activities were measured.
  • Phosphorylation levels of cellular proteins were analyzed using SDS-PAGE.

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Main Results:

  • OdN treatment increased 32P labeling of phosphatidic acid and decreased diacylglycerol.
  • These effects were independent of the specific OdN sequence.
  • PKC activity in isolated membranes from OdN-treated cells was reduced.
  • A decrease in the phosphorylation of 26 and 73 kDa cellular proteins was observed.

Conclusions:

  • Oligodeoxynucleotides (OdN) modulate L929 cell signaling pathways.
  • OdN binding to cell surface receptors influences phospholipase C and protein kinase C (PKC) activity.
  • The observed signaling effects are sequence-independent and involve altered protein phosphorylation.