Regulation of gastric mucosal integrity by endogenous nitric oxide: interactions with prostanoids and sensory neuropeptides in the rat
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Discussion
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Implication
Preclinical study demonstrates that nitric oxide collaborates with prostanoids and sensory neuropeptides to preserve gastric mucosal integrity in rats, highlighting overlapping protective pathways.
Key Points
- To examine the physiological interactions between nitric oxide, prostacyclin, and sensory neuropeptides in preserving gastric mucosal integrity.
- Anaesthetized rats received intravenous L-NMMA (12.5–100 mg kg⁻¹) alone or after chronic capsaicin pretreatment to deplete sensory neuropeptides.
- Gastric damage was evaluated after inhibiting prostanoid synthesis with indomethacin (5 mg kg⁻¹ i.v.) alone and combined with capsaicin and L-NMMA, alongside L-arginine reversal challenges.
- Isolated inhibition via L-NMMA, indomethacin, or sensory neuropeptide depletion with capsaicin failed to induce acute gastric mucosal injury.
- L-NMMA induced dose-dependent vasocongestion and haemorrhagic necrosis in capsaicin-pretreated rats, an effect completely prevented by concurrent L-arginine (300 mg kg⁻¹ i.v.).
- L-NMMA triggered mucosal damage following indomethacin pretreatment, culminating in widespread, severe haemorrhagic necrotic damage when indomethacin and capsaicin pretreatments were combined.
Cite This Study
Whittle et al. (1990) studied this question.