Vanilloid receptor subtype 1, VR1, is an ion channel that serves as a polymodal detector of pain-producing chemicals such as capsaicin and protons in primary afferent neurons. Here we showed that both capsaicin and acidification produced elevations in the intracellular Ca2+ concentration ([Ca2+]i) in cultured human epidermal keratinocytes. The capsaicin- and acidification-evoked increases in [Ca2+]i were inhibited by capsazepine, an antagonist to VR1. VR1-like immunoreactivity was observed in the cells. These findings suggest that functional VR1-like protein is present and functions as a sensor against noxious chemical stimuli, such as capsaicin or acidification, in epidermal keratinocytes.
|Number of pages||6|
|Journal||Biochemical and Biophysical Research Communications|
|Publication status||Published - 2002|
All Science Journal Classification (ASJC) codes
- Molecular Biology
- Cell Biology