Upregulation of cystathionine-β-synthetase expression contributes to inflammatory pain in rat temporomandibular joint

Molecular Pain

Guang-Yin Xu¹  Shufen Hu¹  Hong-Hong Zhang¹  Zhong Ju¹  Geping Wu²  Xiaowen Meng¹  Xiuhua Miao² 

[1] Laboratory for Translational Pain Medicine, Department of Neurobiology, Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Institute of Neuroscience, Soochow University, Suzhou 215123, P.R. China;The Affiliated Zhangjiagang Hospital of Soochow University, Zhangjiagang 215600, P.R. China

关键词: Potassium currents;    Trigeminal ganglion;    Cystathionine-β-synthetase;    Hydrogen sulfide;    Pain;    Temporomandibular joint inflammation;   

Others  :  861882
DOI  :  10.1186/1744-8069-10-9

 received in 2013-10-30, accepted in 2014-01-28,  发布年份 2014

【 摘 要 】

Background

Hydrogen sulfide (H₂S), an endogenous gaseotransmitter/modulator, is becoming appreciated that it may be involved in a wide variety of processes including inflammation and nociception. However, the role for H₂S in nociceptive processing in trigeminal ganglion (TG) neuron remains unknown. The aim of this study was designed to investigate whether endogenous H₂S synthesizing enzyme cystathionine-β-synthetase (CBS) plays a role in inflammatory pain in temporomandibular joint (TMJ).

Methods

TMJ inflammatory pain was induced by injection of complete Freund’s adjuvant (CFA) into TMJ of adult male rats. Von Frey filaments were used to examine pain behavioral responses in rats following injection of CFA or normal saline (NS). Whole cell patch clamp recordings were employed on acutely isolated TG neurons from rats 2 days after CFA injection. Western blot analysis was carried out to measure protein expression in TGs.

Results

Injection of CFA into TMJ produced a time dependent hyperalgesia as evidenced by reduced escape threshold in rats responding to VFF stimulation. The reduced escape threshold was partially reversed by injection of O-(Carboxymethyl) hydroxylamine hemihydrochloride (AOAA), an inhibitor for CBS, in a dose-dependent manner. CFA injection led to a marked upregulation of CBS expression when compared with age-matched controls. CFA injection enhanced neuronal excitability as evidenced by depolarization of resting membrane potentials, reduction in rheobase, and an increase in number of action potentials evoked by 2 and 3 times rheobase current stimulation and by a ramp current stimulation of TG neurons innervating the TMJ area. CFA injection also led to a reduction of I_K but not I_A current density of TG neurons. Application of AOAA in TMJ area reduced the production of H₂S in TGs and reversed the enhanced neural hyperexcitability and increased the I_K currents of TG neurons.

Conclusion

These data together with our previous report indicate that endogenous H₂S generating enzyme CBS plays an important role in TMJ inflammation, which is likely mediated by inhibition of I_K currents, thus identifying a specific molecular mechanism underlying pain and sensitization in TMJ inflammation.

【 授权许可】

   
2014 Miao et al.; licensee BioMed Central Ltd.

【 图 表 】

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