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Efffects of pain inducing agents on voltage dependent calcium currents in the trigeminal ganglion
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- Authors
- Issue Date
- 2001-04
- Publisher
- The Korean Academy of Oral Biology
- Citation
- International Journal of Oral Biology 26:1-6, 2001.
- Keywords
- trigeminal ganglion(TG) ; voltage dependent Ca^2+ current(I_Ca) ; bradykinin ; histamine ; eugenol
- Abstract
- Trigeminal ganglion (TG) neurons are primary sensory neurons involved in the transmission of orofacial sensation, including pain. It is known that intracellular free calcium concentration plays a critical role in neurotransmitter release. In the present study, we examined the effects of pain-inducing agents, bradykinin and histamine, on voltage dependent Ca^2+ current (I_Ca) and compared these with the effects of the analgesic agent, eugenol. I_Ca was measured using a whole-cell patch clamp method. Bradykinin (10μM) inhibited I_Ca in TG neurons. Maximum inward I_Ca was reduced by 26% by bradykinin compared with the controls (n=13, p<0.05). Decreased I_Ca induced by bradykinin did not recover to the prestimulus level after washing out bradykinin. In contrast, histamine (100μM) increased I_Ca by 25% compared with controls (n=7,p<0.05) in an irreversible manner. Eugenol (250μM), commonly used to produce analgesia in dental clinics, decreased I_Ca to 22.6% (n=9,p<0.05) and this effect on the I_Ca was reversible. although the effect of eugenol on the I_Ca was consistent, the effects of the two pain-inducing agents, bradykinin and histamine, were different. Our results suggest that the modulation of I_Ca in TG neurons is not a decisive factor underlying the pain mechanism evoked by pain-inducing agents.
- ISSN
- 1225-6390
- Language
- English
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