Title : Comparison of intracellular calcium signals evoked by heat and capsaicin in cultured rat dorsal root ganglion neurons and in a cell line expressing the rat vanilloid receptor, VR1.

Pub. Date : 2001

PMID : 11226681






7 Functional Relationships(s)
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1 The cloning of the receptor for capsaicin, vanilloid receptor 1, has shown it to be non-selective cation channel with a high calcium permeability which can be opened by noxious heat as well as capsaicin. Capsaicin transient receptor potential cation channel, subfamily V, member 1 Rattus norvegicus
2 The cloning of the receptor for capsaicin, vanilloid receptor 1, has shown it to be non-selective cation channel with a high calcium permeability which can be opened by noxious heat as well as capsaicin. Capsaicin transient receptor potential cation channel, subfamily V, member 1 Rattus norvegicus
3 Here we compare the calcium signals produced by native and recombinant capsaicin receptors when activated by either heat or capsaicin by imaging intracellular calcium levels ([Ca2+](i)) in rat dorsal root ganglion neurons and Chinese hamster ovary cells transfected with the rat vanilloid receptor, vanilloid receptor 1. Capsaicin transient receptor potential cation channel, subfamily V, member 1 Rattus norvegicus
4 Vanilloid receptor 1 transfected cells and a subset of dorsal root ganglion neurons responded to both capsaicin and to heating to 50 degrees C with rapid, substantial and reversible rises in [Ca2+](i). Capsaicin transient receptor potential cation channel, subfamily V, member 1 Rattus norvegicus
5 The competitive capsaicin antagonist capsazepine (10microM) abolished [Ca2+](i) increases stimulated by capsaicin in both dorsal root ganglion neurons and vanilloid receptor 1 transfected cells. Capsaicin transient receptor potential cation channel, subfamily V, member 1 Rattus norvegicus
6 In vanilloid receptor 1 transfected cells, Ruthenium Red (10microM) blocked responses to both capsaicin and heat. Capsaicin transient receptor potential cation channel, subfamily V, member 1 Rattus norvegicus
7 They show that heat and capsaicin responses mediated by native and recombinant capsaicin receptors are similar with respect to the characteristics and pharmacology examined, suggesting that expression of recombinant vanilloid receptor 1 in cell lines accurately reproduces the properties of the native receptor. Capsaicin transient receptor potential cation channel, subfamily V, member 1 Rattus norvegicus