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Published on: September 10, 2016
Pharmacological differences between the human and rat vanilloid receptor 1 (VR1)
P McIntyre1, L M McLatchie, A Chambers
1Novartis Institute for Medical Sciences, 5 Gower Place, London WC1E 6BN, UK. Peter.McIntyre@pharma.novartis.com
British Journal of Pharmacology
|February 28, 2001
Summary
Human and rat vanilloid receptors (VR1) were cloned and expressed. Researchers found differences in capsaicin activation, pH, and antagonist sensitivity between human and rat VR1 channels.
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- Vanilloid receptors (VR1) are key players in pain and thermal sensation.
- Understanding species-specific differences in VR1 function is crucial for drug development.
Purpose of the Study:
- To clone and characterize human and rat vanilloid receptors (VR1).
- To compare the functional properties and pharmacological responses of human and rat VR1.
Main Methods:
- Cloning of human and rat VR1 from dorsal root ganglion libraries.
- Expression in Xenopus oocytes and Chinese Hamster Ovary (CHO) cells.
- Electrophysiological recordings and aequorin luminescence assays to measure channel activity.
Main Results:
- Both human and rat VR1 formed ligand-gated channels activated by capsaicin, with varying potencies across cell types.
- Human VR1 showed lower activation thresholds for acidic solutions compared to rat VR1.
- Differential sensitivity to agonists (PPAHV) and antagonists (capsazepine, ruthenium red) was observed between human and rat VR1.
Conclusions:
- Human and rat VR1 exhibit distinct pharmacological profiles and activation properties.
- These species-specific differences are important for understanding VR1 function and for designing targeted therapeutics.
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