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Andrographolide Relieves Post-Operative Wound Pain but Affects Local Angiogenesis.

Yi-Lo Lin1, Jiunn-Wang Liao1, Shunching Wang2

  • 1Graduate Institute of Veterinary Pathobiology, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung 40227, Taiwan.

Pharmaceuticals (Basel, Switzerland)
|December 23, 2022
PubMed
Summary
This summary is machine-generated.

Andrographolide (Andro) effectively reduced post-operative pain and nerve signaling in rats. However, its pain-relieving effects were not observed when Andro was delivered via a tablet formulation.

Keywords:
Andrographis paniculataandrographolideangiogenesisp-ERKpost-operative wound

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Area of Science:

  • Pharmacology
  • Neuroscience
  • Wound Healing Research

Background:

  • Andrographolide (Andro), derived from *Andrographis paniculata*, is recognized for its anti-inflammatory properties.
  • The analgesic potential of Andro in post-operative pain models requires further investigation.

Purpose of the Study:

  • To investigate the efficacy of Andrographolide (Andro) in mitigating mechanical allodynia in a rat post-operative wound model.
  • To explore the impact of Andro on pain signaling pathways and wound healing processes.

Main Methods:

  • Mechanical allodynia was assessed using Von Frey tests in rats receiving saline, directly injected Andro, or an Andro-loaded tablet.
  • Expression of p-ERK and GluR1 in the spinal cord dorsal horn was examined.
  • Histopathological and CD-31 staining evaluated wound morphology and angiogenesis.

Main Results:

  • Direct injection of Andro significantly increased pain thresholds and reduced reaction frequencies compared to saline.
  • These analgesic effects of Andro persisted for 3-4 days post-surgery.
  • Andro treatment reduced p-ERK and GluR1 levels in the dorsal horn and decreased angiogenesis, without affecting overall wound healing.
  • The Andro-tablet formulation did not demonstrate significant analgesic effects compared to saline.

Conclusions:

  • Andrographolide exhibits significant analgesic properties in a post-operative pain model, mediated through modulation of spinal cord signaling.
  • Direct injection of Andro is effective, while the tested tablet formulation was not, suggesting formulation-dependent delivery challenges.
  • Andro's anti-angiogenic effect warrants further study in the context of wound healing.