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Spermidine is protective against kidney ischemia and reperfusion injury through inhibiting DNA nitration and PARP1

Jinu Kim1,2

  • 1Department of Anatomy, Jeju National University School of Medicine, Jeju, Korea.

Anatomy & Cell Biology
|October 19, 2017
PubMed

Insights

Spermidine, a natural compound, protects kidneys from injury caused by interrupted blood flow (ischemia and reperfusion). It works by reducing oxidative stress and inhibiting key damage pathways, offering a new target for preventing acute kidney injury.

Area of Science:

  • Nephrology
  • Molecular Biology
  • Biochemistry

Background:

  • Kidney ischemia and reperfusion injury (IRI) leads to high mortality.
  • Oxidative and nitrative stresses in tubules contribute to IRI.
  • Effective treatments to limit IRI are currently lacking.

Purpose of the Study:

  • To investigate the protective effects of spermidine against kidney IRI.
  • To elucidate the molecular mechanisms underlying spermidine's protective action.
  • To explore the role of ornithine decarboxylase (ODC) and poly(ADP-ribose) polymerase 1 (PARP1) in IRI.

Main Methods:

  • Administering spermidine to kidneys undergoing IRI.
  • Using siRNA to inhibit ornithine decarboxylase (ODC) in vivo.
  • Assessing histological damage, kidney function, DNA nitration, and PARP1 activation.

Main Results:

  • Spermidine supplementation significantly reduced kidney damage and dysfunction during IRI.
  • Exogenous spermidine inhibited PARP1 activation and DNA nitrative/oxidative stress.
  • ODC inhibition worsened IRI outcomes, while PARP1 inhibition in ODC-knockdown kidneys ameliorated damage but not nitrative stress.

Conclusions:

  • Spermidine protects kidneys against IRI by inhibiting DNA nitration and PARP1 activation.
  • These findings identify spermidine and its related pathways as novel therapeutic targets for preventing acute kidney injury.
  • Targeting spermidine metabolism may offer a new strategy for managing IRI.
Keywords:
Ischemia and reperfusion injuryNitrationOrnithine decarboxylasePoly(ADP-ribose) polymerase 1Spermidine

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