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Nitric oxide scavenging by curcuminoids

Sreejayan1, M N Rao

  • 1Department of Pharmaceutical Chemistry, College of Pharmaceutical Sciences, Manipal, India.

The Journal of Pharmacy and Pharmacology
|January 1, 1997
PubMed
Summary
This summary is machine-generated.

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Curcumin, known for anti-inflammatory and anticancer effects, directly scavenges nitric oxide (NO). This free-radical scavenging ability, including toward NO, may explain its therapeutic benefits in inflammation and cancer.

Area of Science:

  • Biochemistry
  • Pharmacology
  • Free Radical Chemistry

Background:

  • Curcumin exhibits anti-inflammatory and anticancer properties.
  • It is known to inhibit nitric oxide synthase (NOS) in macrophages.
  • Curcumin is a potent scavenger of various free radicals.

Purpose of the Study:

  • To investigate if curcumin can directly scavenge nitric oxide (NO).
  • To determine the role of specific chemical groups in curcumin's NO scavenging activity.

Main Methods:

  • Utilized sodium nitroprusside to generate nitric oxide (NO).
  • Quantified nitrite formation as a measure of NO scavenging.
  • Tested curcumin and related analogs (demethoxycurcumin, bisdemethoxycurcumin, diacetylcurcumin).

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Main Results:

  • Curcumin significantly reduced nitrite formation, indicating direct nitric oxide scavenging.
  • Related curcumin analogs showed comparable activity to curcumin.
  • Methoxy and phenolic groups were found non-essential for NO scavenging.

Conclusions:

  • Curcumin acts as a direct scavenger of nitric oxide.
  • The free-radical scavenging capacity of curcumin, including against NO, likely contributes to its therapeutic effects in inflammatory and cancerous conditions.