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Related Experiment Videos

The decrease of PKCalpha is associated with hepatic apoptosis at early and late phases of polymicrobial sepsis.

H C Jao1, R C Yang, H K Hsu

  • 1Department of Physiology, Kaohsiung Medical College, Taiwan.

Shock (Augusta, Ga.)
|February 28, 2001
PubMed
Summary

Sepsis reduces PKC-alpha, a key protein, leading to increased liver cell death (apoptosis). This apoptosis is linked to changes in Bcl-2 family proteins, suggesting PKC-alpha inactivation drives liver injury during sepsis.

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Area of Science:

  • Hepatology
  • Molecular Biology
  • Immunology

Background:

  • Sepsis is a life-threatening condition characterized by a dysregulated host response to infection.
  • Hepatic apoptosis is a significant contributor to organ dysfunction during sepsis.
  • The role of Protein Kinase C-alpha (PKC-alpha) in sepsis-induced liver injury remains unclear.

Purpose of the Study:

  • To investigate the relationship between PKC-alpha and hepatic apoptosis in a sepsis model.
  • To elucidate the molecular mechanisms underlying sepsis-induced liver cell death.

Main Methods:

  • A cecal ligation and puncture (CLP) model of polymicrobial sepsis in animals.
  • Quantification of PKC-alpha, Bcl-2 family proteins (Bcl-2, Bcl-xL, Bax), and PARP cleavage.
  • Assessment of hepatocyte apoptosis using gel electrophoresis, flow cytometry (Annexin-V-Fluos, propidium iodide), and DNA fragmentation assays.

Related Experiment Videos

  • In vitro study using PKC-alpha antisense treatment in hepatocytes.

    • Main Results:

    • Membrane-associated PKC-alpha expression decreased during early and late sepsis.
    • Bcl-2 and Bcl-xL levels decreased, while Bax expression increased in late sepsis.
    • Poly(ADP-ribose) polymerase (PARP) cleavage and hepatocyte apoptosis were significantly elevated in both early and late sepsis.
    • PKC-alpha antisense treatment exacerbated apoptosis in hepatocytes.
    • Severe DNA fragmentation was observed in late sepsis.

    Conclusions:

    • PKC-alpha inactivation plays a crucial role in modulating hepatic apoptosis during sepsis.
    • Sepsis-induced liver apoptosis is closely associated with alterations in Bcl-2 family protein expression.
    • Targeting PKC-alpha may offer a therapeutic strategy for sepsis-induced liver injury.