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Chelerythrine chloride induces rapid polymorphonuclear leukocyte apoptosis through activation of caspase-3

J F Sweeney1, P K Nguyen, K B Atkins

  • 1Surgery Service, Ann Arbor Veterans Affairs Medical Center and Department of Surgery, University of Michigan, 48109, USA.

Shock (Augusta, Ga.)
|June 10, 2000
PubMed

Insights

Chelerythrine chloride rapidly triggers programmed cell death in human polymorphonuclear leukocytes (PMN), a key factor in resolving inflammation. This process, independent of protein kinase C (PKC), involves increased caspase-3 activity and is not prevented by GM-CSF.

Area of Science:

  • Immunology
  • Cell Biology
  • Pharmacology

Background:

  • Polymorphonuclear leukocytes (PMN) are crucial in initiating and sustaining inflammatory responses.
  • Programmed cell death (apoptosis) in PMNs is essential for resolving inflammation.
  • Understanding PMN apoptosis mechanisms is vital for developing new anti-inflammatory treatments.

Purpose of the Study:

  • To investigate the effects of chelerythrine chloride on human PMN apoptosis.
  • To elucidate the mechanism of chelerythrine chloride-induced PMN apoptosis, including its independence from protein kinase C (PKC).

Main Methods:

  • Treatment of human PMNs with chelerythrine chloride.
  • Assessment of morphological features of apoptosis.
  • Measurement of caspase-3 activity.
  • Evaluation of granulocyte-macrophage colony-stimulating factor (GM-CSF) protective effects.

Main Results:

  • Chelerythrine chloride induces rapid and synchronous apoptosis in human PMNs.
  • The apoptotic process is mediated through a protein kinase C (PKC)-independent pathway.
  • Caspase-3 activity is significantly upregulated before the morphological signs of apoptosis appear.
  • Granulocyte-macrophage colony-stimulating factor (GM-CSF) fails to protect PMNs from chelerythrine chloride-induced apoptosis.

Conclusions:

  • Chelerythrine chloride is a potent inducer of human PMN apoptosis via a PKC-independent mechanism.
  • Upregulation of caspase-3 activity is an early event in chelerythrine chloride-induced PMN apoptosis.
  • Chelerythrine chloride-induced PMN apoptosis is not inhibited by GM-CSF, suggesting a distinct pathway.

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