Kaurenoic Acid Reduces Ongoing Chronic Constriction Injury-Induced Neuropathic Pain: Nitric Oxide Silencing of Dorsal Root Ganglia Neurons

Tiago H. Zaninelli, Sandra S. Mizokami, Mariana M. Bertozzi, Telma Saraiva-Santos, Felipe A. Pinho-Ribeiro, Gabriele Inácio de Oliveira, Renata Streck, Eduardo J.A. Araújo, Nilton S. Arakawa, Sergio M. Borghi, Rubia Casagrande, Waldiceu A. Verri

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Kaurenoic acid (KA) is a diterpene extracted from Sphagneticola trilobata (L.) Pruski. KA presents analgesic properties. However, the analgesic activity and mechanisms of action of KA in neuropathic pain have not been investigated so far; thus, we addressed these points in the present study. A mouse model of neuropathic pain was induced by chronic constriction injury (CCI) of the sciatic nerve. Acute (at the 7th-day post-CCI surgery) and prolonged (from 7–14th days post-CCI surgery) KA post-treatment inhibited CCI-induced mechanical hyperalgesia at all evaluated time points, as per the electronic version of von Frey filaments. The underlying mechanism of KA was dependent on activating the NO/cGMP/PKG/ATP-sensitive potassium channel signaling pathway since L-NAME, ODQ, KT5823, and glibenclamide abolished KA analgesia. KA reduced the activation of primary afferent sensory neurons, as observed by a reduction in CCI-triggered colocalization of pNF-κB and NeuN in DRG neurons. KA treatment also increased the expression of neuronal nitric oxide synthase (nNOS) at the protein level as well as the intracellular levels of NO in DRG neurons. Therefore, our results provide evidence that KA inhibits CCI neuropathic pain by activating a neuronal analgesic mechanism that depends on nNOS production of NO to silence the nociceptive signaling that generates analgesia.

Original languageEnglish
Article number343
JournalPharmaceuticals
Volume16
Issue number3
DOIs
StatePublished - Mar 2023

Keywords

  • CCI
  • Sphagneticola trilobata
  • analgesia
  • chronic constriction injury
  • kaurenoic acid
  • neuropathic pain
  • nitric oxide
  • potassium channels

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