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Peroxynitrite formation from activated human leukocytes

N Fukuyama1, K Ichimori, Z Su

  • 1Department of Physiology 2, Tokai University, Kanagawa, Japan.

Biochemical and Biophysical Research Communications
|July 16, 1996
PubMed
Summary
This summary is machine-generated.

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Polymorphonuclear cells (PMN) generate peroxynitrite, evidenced by 4-hydroxyphenylacetic acid (HPA) nitration. This process requires myeloperoxidase inhibition for accurate detection of 4-hydroxy-3-nitrophenylacetic acid (NO2HPA).

Area of Science:

  • Biochemistry
  • Immunology
  • Cell Biology

Background:

  • Polymorphonuclear cells (PMN) are crucial immune cells involved in inflammatory responses.
  • Peroxynitrite is a reactive nitrogen species implicated in cellular damage during inflammation.
  • Understanding peroxynitrite formation mechanisms in PMNs is vital for inflammatory disease research.

Purpose of the Study:

  • To provide direct evidence of peroxynitrite formation by human PMNs.
  • To investigate the role of myeloperoxidase (MPO) in peroxynitrite production.
  • To identify the nitration product of 4-hydroxyphenylacetic acid (HPA) formed by PMNs.

Main Methods:

  • Human PMNs from healthy volunteers were stimulated with phorbol-12-myristate-13-acetate (PMA).
  • The nitration of 4-hydroxyphenylacetic acid (HPA) to 4-hydroxy-3-nitrophenylacetic acid (NO2HPA) was measured.

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  • Experiments were conducted with and without myeloperoxidase inhibitors and N-monomethyl-L-arginine.

    • Main Results:

    • Direct evidence of peroxynitrite formation was demonstrated by the nitration of HPA to NO2HPA.
    • NO2HPA formation was observed only under PMA stimulation in the presence of an MPO inhibitor.
    • N-monomethyl-L-arginine treatment eliminated NO2HPA, confirming its peroxynitrite-derived nature.

    Conclusions:

    • Human PMNs actively produce peroxynitrite, leading to the nitration of HPA.
    • Myeloperoxidase inhibition is essential to detect PMN-derived peroxynitrite accurately.
    • These findings elucidate a key mechanism in PMN-mediated inflammatory processes.