Mast-Cell Degranulation Induced by Physical Stimuli Involves the Activation of Transient-Receptor-Potential Channel TRPV2

Physiological Research - Trang 113-124 - 2012
D. ZHANG1,2, Andreas Spielmann1, L. Wang1,2, Guanghong Ding2, Fang Huang3, Qin Gu2, Wolfgang Schwarz4,1,2
1Max-Planck-Institute for Biophysics, Frankfurt am Main, Germany
2Shanghai Research Center for Acupuncture and Meridians, Department of Mechanics and Engineering Science, Fudan University, Shanghai, China
3State Key Laboratory of Medical Neurobiology Shanghai Medical College, Fudan University, Shanghai, China
4Institute for Biophysics, Goethe University Frankfurt, Frankfurt am Main, Germany

Tóm tắt

A characteristic of mast cells is the degranulation in response to various stimuli. Here we have investigated the effects of various physical stimuli in the human mast-cell line HMC-1. We have shown that HMC-1 express the transient receptor potential channels TRPV1, TRPV2 and TRPV4. In the whole-cell patch-clamp configuration, increasing mechanical stress applied to the mast cell by hydrostatic pressure (–30 to –90 cm H2O applied via the patch pipette) induced a current that could be inhibited by 10 µM of ruthenium red. This current was also inhibited by 20 µM SKF96365, an inhibitor that is among TRPV channels specific for the TRPV2. A characteristic of TRPV2 is its activation by high noxious temperature; temperatures exceeding 50 °C induced a similar ruthenium-red-sensitive current. As another physical stimulus, we applied laser light of 640 nm. Here we have shown for the first time that the application of light (at 48 mW for 20 min) induced an SKF96365-sensitive current. All three physical stimuli that led to activation of SKF96365-sensitive current also induced pronounced degranulation in the mast cells, which could be blocked by ruthenium red or SKF96365. The results suggest that TRPV2 is activated by the three different types of physical stimuli. Activation of TRPV2 allows Ca2+ ions to enter the cell, which in turn will induce degranulation. We, therefore, suggest that TRPV2 plays a key role in mast-cell degranulation in response to mechanical, heat and red laser-light stimulation.

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Physiological Research

113-124

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