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Qin QR, Xu ZQ, Liu TT, Li XM, Qiu CY, Hu WP. CCK-8 enhances acid-sensing ion channel currents in rat primary sensory neurons. Neuropharmacology 2023; 241:109739. [PMID: 37820935 DOI: 10.1016/j.neuropharm.2023.109739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 09/07/2023] [Accepted: 09/28/2023] [Indexed: 10/13/2023]
Abstract
Cholecystokinin (CCK) is a peptide that has been implicated in pain modulation. Acid sensitive ion channels (ASICs) also play an important role in pain associated with tissue acidification. However, it is still unclear whether there is an interaction between CCK signaling and ASICs during pain process. Herein, we report that a functional link between them in rat dorsal root ganglion (DRG) neurons. Pretreatment with CCK-8 concentration-dependently increased acid-evoked ASIC currents. CCK-8 increased the maximum response of ASICs to acid, but did not changed their acid sensitivity. Enhancement of ASIC currents by CCK-8 was mediated by the stimulation of CCK2 receptor (CCK2R), rather than CCK1R. The enhancement of ASIC currents by CCK-8 was prevented by application of either G-protein inhibitor GDP-β-S or protein kinase C (PKC) inhibitor GF109203×, but not by protein kinase A (PKA) inhibitor H-89 or JNK inhibitor SP600125. Moreover, CCK-8 increased the number of action potentials triggered by acid stimuli by activating CCK2R. Finally, CCK-8 dose-dependently exacerbated acid-induced nociceptive behavior in rats through local CCK2R. Together, these results indicated that CCK-8/CCK2R activation enhanced ASIC-mediated electrophysiological activity in DRG neurons and nociception in rats. The enhancement effect depended on G-proteins and intracellular PKC signaling rather than PKA and JNK signaling pathway. These findings provided that CCK-8/CCK2R is an important therapeutic target for ASIC-mediated pain.
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Affiliation(s)
- Qing-Rui Qin
- School of Pharmacy, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Zhong-Qing Xu
- School of Pharmacy, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Ting-Ting Liu
- School of Pharmacy, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Xue-Mei Li
- School of Pharmacy, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Chun-Yu Qiu
- School of Pharmacy, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China.
| | - Wang-Ping Hu
- School of Pharmacy, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China; Department of Physiology, Hubei College of Chinese Medicine, 87 Xueyuan Road, Jingzhou 434020, Hubei, PR China.
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Hao JW, Liu TT, Qiu CY, Li XM, Qiao WL, Li Q, Qin QR, Hu WP. Lipid mediator resolvin D2 inhibits ATP currents in rat primary sensory neurons. J Neurochem 2023. [PMID: 37987505 DOI: 10.1111/jnc.16009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 10/19/2023] [Accepted: 10/19/2023] [Indexed: 11/22/2023]
Abstract
Resolvin D2 (RvD2), an endogenous lipid mediator derived from docosahexaenoic acid, has been demonstrated to have analgesic effects. However, little is known about the mechanism underlying RvD2 in pain relief. Herein, we demonstrate that RvD2 targeted the P2X3 receptor as an analgesic. The electrophysiological activity of P2X3 receptors was suppressed by RvD2 in rat dorsal root ganglia (DRG) neurons. RvD2 pre-application dose-dependently decreased α,β-methylene-ATP (α,β-meATP)-induced inward currents. RvD2 remarkably decreased the maximum response to α,β-meATP, without influencing the affinity of P2X3 receptors. RvD2 also voltage-independently suppressed ATP currents. An antagonist of the G protein receptor 18 (GPR18), O-1918, prevented the RvD2-induced suppression of ATP currents. Additionally, intracellular dialysis of the Gαi/o -protein antagonist pertussis toxin (PTX), the PKA antagonist H89, or the cAMP analog 8-Br-cAMP also blocked the RvD2-induced suppression. Furthermore, α,β-meATP-triggered depolarization of membrane potential along with the action potential bursts in DRG neurons were inhibited by RvD2. Lastly, RvD2 attenuated spontaneous nociceptive behaviors as well as mechanical allodynia produced by α,β-meATP in rats via the activation of the peripheral GPR18. These findings indicated that RvD2 inhibited P2X3 receptors in rat primary sensory neurons through GPR18, PTX-sensitive Gαi/o -proteins, and intracellular cAMP/PKA signaling, revealing a novel mechanism that underlies its analgesic effects by targeting P2X3 receptors.
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Affiliation(s)
- Jia-Wei Hao
- School of Pharmacy, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei, PR China
| | - Ting-Ting Liu
- School of Pharmacy, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei, PR China
| | - Chun-Yu Qiu
- School of Pharmacy, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei, PR China
| | - Xue-Mei Li
- School of Pharmacy, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei, PR China
| | - Wen-Long Qiao
- School of Pharmacy, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei, PR China
| | - Qing Li
- School of Pharmacy, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei, PR China
| | - Qing-Rui Qin
- School of Pharmacy, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei, PR China
| | - Wang-Ping Hu
- School of Pharmacy, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei, PR China
- Department of Physiology, Hubei College of Chinese Medicine, Jingzhou, Hubei, PR China
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Liu TT, Qiu CY, Hu WP. Metformin inhibits spontaneous excitatory postsynaptic currents in spinal dorsal cord neurons from paclitaxel-treated rats. Front Synaptic Neurosci 2023; 15:1191383. [PMID: 37216004 PMCID: PMC10195993 DOI: 10.3389/fnsyn.2023.1191383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 04/20/2023] [Indexed: 05/24/2023] Open
Abstract
Introduction Cancer patients treated with paclitaxel often develop chemotherapy-induced peripheral neuropathy, which has not been effectively treated with drugs. The anti-diabetic drug metformin is effective in the treatment of neuropathic pain. The aim of this study was to elucidate effect of metformin on paclitaxel-induced neuropathic pain and spinal synaptic transmission. Methods Electrophysiological experiments on rat spinal slices were performed in vitro and mechanical allodynia quantified in vitro. Results The present data demonstrated that intraperitoneal injection of paclitaxel produced mechanical allodynia and potentiated spinal synaptic transmission. Intrathecal injection of metformin significantly reversed the established mechanical allodynia induced by paclitaxel in rats. Either spinal or systemic administration of metformin significantly inhibited the increased frequency of spontaneous excitatory postsynaptic currents (sEPSCs) in spinal dorsal horn neurons from paclitaxel-treated rats. We found that 1 h incubation of metformin also reduced the frequency rather than the amplitude of sEPSCs in the spinal slices from paclitaxel-treated rats. Discussion These results suggested that metformin was able to depress the potentiated spinal synaptic transmission, which may contribute to alleviating the paclitaxel-induced neuropathic pain.
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Affiliation(s)
- Ting-Ting Liu
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei, China
| | - Chun-Yu Qiu
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei, China
| | - Wang-Ping Hu
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, Hubei, China
- Department of Physiology, Hubei College of Chinese Medicine, Jingzhou, Hubei, China
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Bao XD, Shi YX, Yu M, Liu SJ, Mi LH, Wu C, Hu WP. [Establishment of contralateral arteriovenous fistula by using the waste vein on the side of central venous lesion: a case report]. Zhonghua Gan Zang Bing Za Zhi 2023; 39:36-38. [PMID: 36776013 DOI: 10.3760/cma.j.cn441217-20220321-00342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Central venous lesion is a difficult problem in the vascular access complications of hemodialysis, which can cause serious clinical symptoms and affect the quality of hemodialysis and life of patients. We established arteriovenous fistula of the contralateral graft blood vessel with the used vein on the diseased side of the central vein of the patient. The arteriovenous fistula of the graft blood vessel was successfully punctured and hemodialysis was performed 2 weeks later. In this way, we not only solved the problem of venous hypertension and subsequent vascular access in the patient, but also reserved more vascular resources.
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Affiliation(s)
- X D Bao
- Department of Vascular Surgery, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China
| | - Y X Shi
- Department of Vascular Surgery, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China
| | - M Yu
- Department of Vascular Surgery, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China
| | - S J Liu
- Department of Vascular Surgery, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China
| | - L H Mi
- Department of Vascular Surgery, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China
| | - C Wu
- Department of Vascular Surgery, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China
| | - W P Hu
- Department of Vascular Surgery, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China
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Hao JW, Qiao WL, Li Q, Wei S, Li XM, Liu TT, Qiu CY, Hu WP. A1 Adenosine Receptor Activation Inhibits P2X3 Receptor-Mediated ATP Currents in Rat Dorsal Root Ganglion Neurons. Mol Neurobiol 2022; 59:7025-7035. [PMID: 36074232 DOI: 10.1007/s12035-022-03019-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Accepted: 08/26/2022] [Indexed: 10/14/2022]
Abstract
Purinergic signaling is involved in multiple pain processes. P2X3 receptor is a key target in pain therapeutics, while A1 adenosine receptor signaling plays a role in analgesia. However, it remains unclear whether there is a link between them in pain. The present results showed that the A1 adenosine receptor agonist N6-cyclopentyladenosine (CPA) concentration dependently suppressed P2X3 receptor-mediated and α,β-methylene-ATP (α,β-meATP)-evoked inward currents in rat dorsal root ganglion (DRG) neurons. CPA significantly decreased the maximal current response to α,β-meATP, as shown a downward shift of the concentration-response curve for α,β-meATP. CPA suppressed ATP currents in a voltage-independent manner. Inhibition of ATP currents by CPA was completely prevented by the A1 adenosine receptor antagonist KW-3902, and disappeared after the intracellular dialysis of either the Gi/o protein inhibitor pertussis toxin, the adenylate cyclase activator forskolin, or the cAMP analog 8-Br-cAMP. Moreover, CPA suppressed the membrane potential depolarization and action potential bursts, which were induced by α,β-meATP in DRG neurons. Finally, CPA relieved α,β-meATP-induced nociceptive behaviors in rats by activating peripheral A1 adenosine receptors. These results indicated that CPA inhibited the activity of P2X3 receptors in rat primary sensory neurons by activating A1 adenosine receptors and its downstream cAMP signaling pathway, revealing a novel peripheral mechanism underlying its analgesic effect.
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Affiliation(s)
- Jia-Wei Hao
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China.,School of Pharmacy, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Wen-Long Qiao
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China.,School of Pharmacy, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Qing Li
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China.,School of Pharmacy, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Shuang Wei
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China.,School of Pharmacy, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Xue-Mei Li
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Ting-Ting Liu
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Chun-Yu Qiu
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Wang-Ping Hu
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China. .,Hubei College of Chinese Medicine, 87 Xueyuan Road, Jingzhou, 434020, Hubei, People's Republic of China.
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6
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Qiao WL, Li Q, Hao JW, Wei S, Li XM, Liu TT, Qiu CY, Hu WP. Enhancement of P2X3 Receptor-Mediated Currents by Lysophosphatidic Acid in Rat Primary Sensory Neurons. Front Pharmacol 2022; 13:928647. [PMID: 35795546 PMCID: PMC9251206 DOI: 10.3389/fphar.2022.928647] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 05/31/2022] [Indexed: 11/13/2022] Open
Abstract
Lysophosphatidic acid (LPA), a lipid metabolite, plays a role in both neuropathic and inflammatory pain through LPA1 receptors. P2X3 receptor has also been shown to participate in these pathological processes. However, it is still unclear whether there is a link between LPA signaling and P2X3 receptors in pain. Herein, we show that a functional interaction between them in rat dorsal root ganglia (DRG) neurons. Pretreatment of LPA concentration-dependently enhanced α,β-methylene-ATP (α,β-meATP)-induced inward currents mediated by P2X3 receptors. LPA significantly increased the maximal current response of α,β-meATP, showing an upward shift of the concentration-response curve for α,β-meATP. The LPA enhancement was independent on the clamping-voltage. Enhancement of P2X3 receptor-mediated currents by LPA was prevented by the LPA1 receptor antagonist Ki16198, but not by the LPA2 receptor antagonist H2L5185303. The LPA-induced potentiation was also attenuated by intracellular dialysis of either G-protein inhibitor or protein kinase C (PKC) inhibitor, but not by Rho inhibitor. Moreover, LPA significantly changed the membrane potential depolarization and action potential burst induced by α,β-meATP in DRG neurons. Finally, LPA exacerbated α,β-meATP- induced nociceptive behaviors in rats. These results suggested that LPA potentiated the functional activity of P2X3 receptors in rat primary sensory neurons through activation of the LPA1 receptor and its downstream PKC rather than Rho signaling pathway, indicating a novel peripheral mechanism underlying the sensitization of pain.
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Affiliation(s)
- Wen-Long Qiao
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
- School of Pharmacy, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
| | - Qing Li
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
- School of Pharmacy, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
| | - Jia-Wei Hao
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
- School of Pharmacy, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
| | - Shuang Wei
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
- School of Pharmacy, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
| | - Xue-Mei Li
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
| | - Ting-Ting Liu
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
| | - Chun-Yu Qiu
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
| | - Wang-Ping Hu
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
- Hubei College of Chinese Medicine, Jingzhou, China
- *Correspondence: Wang-Ping Hu,
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Wei S, Liu TT, Hu WP, Qiu CY. Resveratrol inhibits the activity of acid-sensing ion channels in male rat dorsal root ganglion neurons. J Neurosci Res 2022; 100:1755-1764. [PMID: 35592934 DOI: 10.1002/jnr.25060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 04/16/2022] [Accepted: 04/22/2022] [Indexed: 11/07/2022]
Abstract
Resveratrol can relieve pain under various pain conditions. One of the mechanisms of resveratrol analgesia is the regulation of ion channels. Acid-sensing ion channels (ASICs) are expressed predominantly in nociceptive sensory neurons to detect changes in extracellular pH. ASICs are important players in pain associated with tissue acidification. However, it is still unclear whether ASICs are resveratrol targets. Electrophysiological recordings showed that resveratrol decreased acid-induced and ASIC-mediated currents in male rat dorsal root ganglion (DRG) neurons in a concentration-dependent manner. Resveratrol downwardly shifted the concentration-response curve for protons, suggesting that it inhibited ASICs not by changing the pH0.5 , but by suppressing the proton-induced maximum response. It also suppressed acid-triggered action potentials in the rat DRG neurons. Finally, intraplantar pretreatment with resveratrol relieved acid-induced nociceptive responses in male rats in a dose-dependent manner. These results indicated that resveratrol inhibited ASIC-mediated electrophysiological activity and nociception, suggesting a novel peripheral mechanism underlying its analgesic effect.
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Affiliation(s)
- Shuang Wei
- School of Pharmacy, Xianning Medical College, Hubei University of Science and Technology, Xianning, PR China.,School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, PR China
| | - Ting-Ting Liu
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, PR China
| | - Wang-Ping Hu
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, PR China.,Department of Physiology, Hubei College of Chinese Medicine, Jingzhou, PR China
| | - Chun-Yu Qiu
- School of Pharmacy, Xianning Medical College, Hubei University of Science and Technology, Xianning, PR China.,School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, PR China
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8
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Wei S, Hao JW, Qiao WL, Li Q, Liu TT, Qiu CY, Hu WP. Suppression of ASIC activity by the activation of A1 adenosine receptors in rat primary sensory neurons. Neuropharmacology 2021; 205:108924. [PMID: 34919904 DOI: 10.1016/j.neuropharm.2021.108924] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 11/21/2021] [Accepted: 12/10/2021] [Indexed: 11/25/2022]
Abstract
Peripheral A1 adenosine receptor signaling has been shown to have analgesic effects in a variety of pain conditions. However, it is not yet fully elucidated for the precise molecular mechanisms. Acid sensing ion channels (ASICs) are expressed predominantly in nociceptive sensory neurons responding to protons. Given that both A1 adenosine receptors and ASICs are present in dorsal root ganglia (DRG) neurons, we therefore investigated whether there was a cross-talk between the two types of receptors. Herein, electrophysiological recordings showed that the A1 adenosine receptor agonist N6-cyclopentyladenosine (CPA) suppressed acid-induced currents and action potentials, which were mediated by ASICs, in rat DRG neurons. CPA inhibited the maximum response to protons, as shown a downward shift of concentration-response curve for protons. The CPA-induced suppression of ASIC currents was blocked by the A1 adenosine receptor antagonist KW-3902 and also prevented by intracellular application of the Gi/o-protein inhibitor pertussis toxin, the adenylate cyclase activator forskolin, and the cAMP analog 8-Br-cAMP. Finally, intraplantar pretreatment of CPA dose-dependently relieved acid-induced nociceptive responses in rats through peripheral A1 adenosine receptors. These results suggested that CPA suppressed ASICs via A1 adenosine receptors and intracellular Gi/o-proteins and cAMP signaling cascades in rat DRG neurons, which was a novel potential mechanism underlying analgesia of peripheral A1 adenosine receptors.
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Affiliation(s)
- Shuang Wei
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China
| | - Jia-Wei Hao
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China
| | - Wen-Long Qiao
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China
| | - Qing Li
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China
| | - Ting-Ting Liu
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China
| | - Chun-Yu Qiu
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China
| | - Wang-Ping Hu
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China; Hubei College of Chinese Medicine, 87 Xueyuan Road, Jingzhou, 434020, Hubei, PR China.
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Hao JW, Qiao WL, Li Q, Wei S, Liu TT, Qiu CY, Hu WP. Suppression of P2X3 receptor-mediated currents by the activation of α 2A -adrenergic receptors in rat dorsal root ganglion neurons. CNS Neurosci Ther 2021; 28:289-297. [PMID: 34862748 PMCID: PMC8739037 DOI: 10.1111/cns.13774] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2021] [Revised: 11/09/2021] [Accepted: 11/23/2021] [Indexed: 11/29/2022] Open
Abstract
Aims The α2‐adrenergic receptor (α2‐AR) agonists have been shown to be effective in the treatment of various pain. For example, dexmedetomidine (DEX), a selective α2A‐AR agonist, can be used for peripheral analgesia. However, it is not yet fully elucidated for the precise molecular mechanisms. P2X3 receptor is a major receptor processing nociceptive information in primary sensory neurons. Herein, we show that a functional interaction of α2A‐ARs and P2X3 receptors in dorsal root ganglia (DRG) neurons could contribute to peripheral analgesia of DEX. Methods Electrophysiological recordings were carried out on rat DRG neurons, and nociceptive behavior was quantified in rats. Results The activation of α2A‐ARs by DEX suppressed P2X3 receptor‐mediated and α,β‐methylene‐ATP (α,β‐meATP)‐evoked inward currents in a concentration‐dependent and voltage‐independent manner. Pre‐application of DEX shifted the α,β‐meATP concentration‐response curve downwards, with a decrease of 50.43 ± 4.75% in the maximal current response of P2X3 receptors to α,β‐meATP in the presence of DEX. Suppression of α,β‐meATP‐evoked currents by DEX was blocked by the α2A‐AR antagonist BRL44408 and prevented by intracellular application of the Gi/o protein inhibitor pertussis toxin, the adenylate cyclase activator forskolin, and the cAMP analog 8‐Br‐cAMP. DEX also suppressed α,β‐meATP‐evoked action potentials through α2A‐ARs in rat DRG neurons. Finally, the activation of peripheral α2A‐ARs by DEX had an analgesic effect on the α,β‐meATP‐induced nociception. Conclusions These results suggested that activation of α2A‐ARs by DEX suppressed P2X3 receptor‐mediated electrophysiological and behavioral activity via a Gi/o proteins and cAMP signaling pathway, which was a novel potential mechanism underlying analgesia of peripheral α2A‐AR agonists.
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Affiliation(s)
- Jia-Wei Hao
- School of Basic Medical Sciences, Hubei University of Science and Technology, Hubei, China.,Department of Pharmacology, School of Pharmacy, Hubei University of Science and Technology, Hubei, China
| | - Wen-Long Qiao
- School of Basic Medical Sciences, Hubei University of Science and Technology, Hubei, China.,Department of Pharmacology, School of Pharmacy, Hubei University of Science and Technology, Hubei, China
| | - Qing Li
- School of Basic Medical Sciences, Hubei University of Science and Technology, Hubei, China.,Department of Pharmacology, School of Pharmacy, Hubei University of Science and Technology, Hubei, China
| | - Shuang Wei
- School of Basic Medical Sciences, Hubei University of Science and Technology, Hubei, China.,Department of Pharmacology, School of Pharmacy, Hubei University of Science and Technology, Hubei, China
| | - Ting-Ting Liu
- School of Basic Medical Sciences, Hubei University of Science and Technology, Hubei, China
| | - Chun-Yu Qiu
- School of Basic Medical Sciences, Hubei University of Science and Technology, Hubei, China
| | - Wang-Ping Hu
- School of Basic Medical Sciences, Hubei University of Science and Technology, Hubei, China
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Li J, Hu WP, Zhong G. Clinical therapeutic effects of platelet-rich plasma in patients with burn wound healing: A protocol for systematic review and meta-analysis. Medicine (Baltimore) 2021; 100:e26404. [PMID: 34397792 PMCID: PMC8341333 DOI: 10.1097/md.0000000000026404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 06/03/2021] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND In clinical settings, burn wounds are frequently encountered. Since burn wounds are a form of physical injury, they can have long-term adverse effects on the human body. It has been a significant challenge to treat burn wounds completely. Since traditional treatment strategies have been unable to heal burn wounds completely, they lack the efficacy to cure the wounds without long-term effects, such as heavy scarring. Reportedly, platelet-rich plasma (PRP) has shown potential to accelerate wound healing. Yet, there are no conclusive reports on a methodological comparative study of research that has assessed the medical benefits of PRP for treating individuals carrying burn wounds. Thus, the present meta-analysis and systematic study aims to assess the medical benefits of PRP for treating patients carrying burn wounds. METHODS The authors will conduct a comprehensive search for randomized controlled trials that evaluate the safeness and efficiency of PRP to treat burn wounds. The search includes 3 Chinese language databases (WanFang database, Chinese BioMedical Literature database, and China National Knowledge Infrastructure) and 4 English language databases (Cochrane Library, EMBASE, Web of Science, and MEDLINE). These electronic databases will be searched from their establishment till May 2021. A pair of independent authors will be selecting eligible studies for extracting data. The same authors will employ the Cochrane risk of bias tool to evaluate the bias risk. We will make use of RevMan (version: 5.3) software to complete data synthesis. RESULTS The present protocol will establish practical and targeted results evaluating the efficacy and safeness of using PRP to treat burn wounds. The current study also provides a reference for clinical use of PRP. CONCLUSION Stronger evidence about the effectiveness and safety of using PRP to treat and heal burn wounds will be provided for clinicians to refer. ETHICS AND DISSEMINATION Ethics approval is unrequired. REGISTRATION NUMBER March 31, 2021.osf.io/whauj. (https://osf.io/whauj/).
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Affiliation(s)
- Jie Li
- Department of Emergency Surgery, Tianyou Hospital Affiliated to Wuhan University of Science & Technology, Wuhan, Hubei, China
| | - Wang-Ping Hu
- Department of Critical Care Medicine, the First People's Hospital of Jiangxia District, Wuhan, Hubei, China
| | - Guo Zhong
- Department of Emergency Surgery, Tianyou Hospital Affiliated to Wuhan University of Science & Technology, Wuhan, Hubei, China
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11
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Jin Y, Wei S, Liu TT, Qiu CY, Hu WP. Acute P38-Mediated Enhancement of P2X3 Receptor Currents by TNF-α in Rat Dorsal Root Ganglion Neurons. J Inflamm Res 2021; 14:2841-2850. [PMID: 34234509 PMCID: PMC8254564 DOI: 10.2147/jir.s315774] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Accepted: 06/05/2021] [Indexed: 11/23/2022] Open
Abstract
Purpose Tumor necrosis factor-α (TNF-α) is a pro-inflammatory cytokine and involves in a variety of pain conditions. Some findings suggest that TNF-α may act directly on primary afferent neurons to induce acute pain hypersensitivity through non-transcriptional regulation. This study investigated whether TNF-α had an effect on functional activity of P2X3 receptors in primary sensory neurons. Herein, we report that a brief (5 min) application of TNF-α rapidly enhanced the electrophysiological activity of P2X3 receptors in rat dorsal root ganglia (DRG) neurons. Methods Electrophysiological recordings were carried out on rat DRG neurons, and nociceptive behavior was quantified in rats. Results A brief (5 min) exposure of TNF-α rapidly increased P2X3 receptor-mediated and α,β-methylene-ATP (α,β-meATP)-evoked inward currents in a dose-dependent manner. The potentiation of P2X3 receptor-mediated ATP currents by TNF-α was voltage-independent. TNF-α shifted the concentration-response curve for α,β-meATP upwards, with an increase of 31.57 ± 6.81% in the maximal current response to α,β-meATP. This acute potentiation of ATP currents by TNF-α was blocked by p38 mitogen-activated protein kinase (MAPK) inhibitor SB202190, but not by non-selective cyclooxygenase inhibitor indomethacin, suggesting involvement of p38 MAPK, but not cyclooxygenase. Moreover, intraplantar injection of TNF-α and α,β-meATP produced a synergistic effect on mechanical allodynia in rats. TNF-α-induced mechanical allodynia was also alleviated after local P2X3 receptors were blocked. Conclusion These results suggested that TNF-α rapidly sensitized P2X3 receptors in primary sensory neurons via a p38 MAPK dependent pathway, which revealed a novel peripheral mechanism underlying acute mechanical hypersensitivity by peripheral administration of TNF-α.
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Affiliation(s)
- Ying Jin
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, Hubei, 437100, People's Republic of China
| | - Shuang Wei
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, Hubei, 437100, People's Republic of China
| | - Ting-Ting Liu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, Hubei, 437100, People's Republic of China
| | - Chun-Yu Qiu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, Hubei, 437100, People's Republic of China
| | - Wang-Ping Hu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, Hubei, 437100, People's Republic of China
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12
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Wei S, Qiu CY, Jin Y, Liu TT, Hu WP. Dexmedetomidine Inhibits ASIC Activity via Activation of α 2A Adrenergic Receptors in Rat Dorsal Root Ganglion Neurons. Front Pharmacol 2021; 12:685460. [PMID: 34108881 PMCID: PMC8181722 DOI: 10.3389/fphar.2021.685460] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 05/11/2021] [Indexed: 01/13/2023] Open
Abstract
Dexmedetomidine (DEX), a selective α2 adrenergic receptor (α2-AR) agonist, has been shown to have peripheral analgesic effects in a variety of pain conditions. However, the precise molecular mechanisms have not yet been fully elucidated. Acid sensing ion channels (ASICs) are the major player in pain associated with tissue acidosis. Given that both α2-ARs and ASICs exist in dorsal root ganglia (DRG) neurons, we therefore investigated the effects of DEX on the functional activity of ASICs. Herein, whole-cell patch-clamp recordings demonstrated that DEX suppressed ASIC-mediated and acid-evoked currents and action potentials in dissociated rat DRG neurons. DEX shifted downwards concentration-response curve to protons, with a decrease of 35.83 ± 3.91% in the maximal current response to pH 4.5. DEX-induced inhibition of ASIC currents was blocked by the α2A-AR antagonist BRL44408 in DRG neurons. DEX also inhibited ASIC3 currents in CHO cells co-expressing ASIC3 and α2A-ARs, but not in ASIC3 transfected CHO cells without α2A-ARs expression. DEX-induced inhibition of ASIC currents was mimicked by the protein kinase A inhibitor H-89, and blocked by intracellular application of the Gi/o protein inhibitor pertussis toxin and the cAMP analog 8-Br-cAMP. In addition, peripherally administration of DEX dose-dependently relieved nociceptive responses to intraplantar injection of acetic acid in rats through local α2A-ARs. Our results indicated that DEX inhibited the functional activity of ASICs via α2A-ARs and intracellular Gi/o proteins and cAMP/protein kinase A signaling pathway in rat DRG neurons, which was a novel potential mechanism that probably mediated peripheral analgesia of DEX.
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Affiliation(s)
- Shuang Wei
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, China.,Department of Pharmacology, Hubei University of Science and Technology, Xianning, China
| | - Chun-Yu Qiu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, China
| | - Ying Jin
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, China
| | - Ting-Ting Liu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, China
| | - Wang-Ping Hu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, China
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Wei S, Qiu CY, Jin Y, Liu TT, Hu WP. TNF-α acutely enhances acid-sensing ion channel currents in rat dorsal root ganglion neurons via a p38 MAPK pathway. J Neuroinflammation 2021; 18:92. [PMID: 33853615 PMCID: PMC8048296 DOI: 10.1186/s12974-021-02151-w] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 04/07/2021] [Indexed: 12/31/2022] Open
Abstract
Background Tumor necrosis factor-α (TNF-α) is a pro-inflammatory cytokine involved in pain processing and hypersensitivity. It regulates not only the expression of a variety of inflammatory mediators but also the functional activity of some ion channels. Acid-sensing ion channels (ASICs), as key sensors for extracellular protons, are expressed in nociceptive sensory neurons and contribute to pain signaling caused by tissue acidosis. It is still unclear whether TNF-α has an effect on functional activity of ASICs. Herein, we reported that a brief exposure of TNF-α acutely sensitized ASICs in rat dorsal root ganglion (DRG) neurons. Methods Electrophysiological experiments on rat DRG neurons were performed in vitro and acetic acid induced nociceptive behavior quantified in vitro. Results A brief (5min) application of TNF-α rapidly enhanced ASIC-mediated currents in rat DRG neurons. TNF-α (0.1-10 ng/ml) dose-dependently increased the proton-evoked ASIC currents with an EC50 value of 0.12 ± 0.01 nM. TNF-α shifted the concentration-response curve of proton upwards with a maximal current response increase of 42.34 ± 7.89%. In current-clamp recording, an acute application of TNF-α also significantly increased acid-evoked firing in rat DRG neurons. The rapid enhancement of ASIC-mediated electrophysiological activity by TNF-α was prevented by p38 mitogen-activated protein kinase (MAPK) inhibitor SB202190, but not by non-selective cyclooxygenase inhibitor indomethacin, suggesting that p38 MAPK is necessary for this enhancement. Behaviorally, TNF-α exacerbated acid-induced nociceptive behaviors in rats via activation of local p38 MAPK pathway. Conclusions These results suggest that TNF-α rapidly enhanced ASIC-mediated functional activity via a p38 MAPK pathway, which revealed a novel peripheral mechanism underlying TNF-α involvement in rapid hyperalgesia by sensitizing ASICs in primary sensory neurons.
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Affiliation(s)
- Shuang Wei
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China.,Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China
| | - Chun-Yu Qiu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China
| | - Ying Jin
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China
| | - Ting-Ting Liu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China
| | - Wang-Ping Hu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China.
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14
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Zhou YM, Wu L, Wei S, Jin Y, Liu TT, Qiu CY, Hu WP. Enhancement of acid-sensing ion channel activity by prostaglandin E2 in rat dorsal root ganglion neurons. Brain Res 2019; 1724:146442. [PMID: 31513790 DOI: 10.1016/j.brainres.2019.146442] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 07/12/2019] [Accepted: 09/07/2019] [Indexed: 11/16/2022]
Abstract
Prostaglandin E2 (PGE2) and proton are typical inflammatory mediators. They play a major role in pain processing and hypersensitivity through activating their cognate receptors expressed in terminals of nociceptive sensory neurons. However, it remains unclear whether there is an interaction between PGE2 receptors and proton-activated acid-sensing ion channels (ASICs). Herein, we show that PGE2 enhanced the functional activity of ASICs in rat dorsal root ganglion (DRG) neurons through EP1 and EP4 receptors. In the present study, PGE2 concentration-dependently increased ASIC currents in DRG neurons. It shifted the proton concentration-response curve upwards, without change in the apparent affinity of proton for ASICs. Moreover, PGE2 enhancement of ASIC currents was partially blocked by EP1 or EP4 receptor antagonist. PGE2 failed to enhance ASIC currents when simultaneous blockade of both EP1 and EP4 receptors. PGE2 enhancement was partially suppressed after inhibition of intracellular PKC or PKA signaling, and completely disappeared after concurrent blockade of both PKC and PKA signaling. PGE2 increased significantly the expression levels of p-PKCε and p-PKA in DRG cells. PGE2 also enhanced proton-evoked action potentials in rat DRG neurons. Finally, peripherally administration of PGE2 dose-dependently exacerbated acid-induced nocifensive behaviors in rats through EP1 and EP4 receptors. Our results indicate that PGE2 enhanced the electrophysiological activity of ASICs in DRG neurons and contributed to acidosis-evoked pain, which revealed a novel peripheral mechanism underlying PGE2 involvement in hyperalgesia by sensitizing ASICs in primary sensory neurons.
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Affiliation(s)
- Yi-Mei Zhou
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China; Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Lei Wu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Shuang Wei
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China; Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Ying Jin
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China; Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Ting-Ting Liu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China; Department of Physiology, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Chun-Yu Qiu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Wang-Ping Hu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China; Department of Physiology, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China.
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15
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Qiu CY, Liu TT, Wei S, Zhou YM, Wu L, Jin Y, Hu WP. TGF-β1 enhances the activity of acid-sensing ion channel in rat primary sensory neurons. J Neurosci Res 2019; 97:1298-1305. [PMID: 31240740 DOI: 10.1002/jnr.24481] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 05/27/2019] [Accepted: 05/28/2019] [Indexed: 12/20/2022]
Abstract
Transforming growth factor-β1 (TGF-β1) is an important member of multifunctional growth factor superfamily. It has been implicated in pain signaling, but little is known about the underlying mechanisms. Herein, we report that TGF-β1 can exert a sustained enhancing effect on the functional activity of acid-sensing ion channels (ASICs) in rat dorsal root ganglia (DRG) neurons. Pre-application of TGF-β1 increased the amplitude of proton-gated currents in a dose-dependent manner. Enhancement of ASIC currents lasted for more than 30 min although TGF-β1 was treated once only. This sustained enhancement by TGF-β1 could be blocked by extracellular treatment of selective TGF-β receptor I antagonist SD-208, and abolished by blockade of intracellular several non-Smad-signaling pathways. TGF-β1 also sustainedly enhanced proton-evoked spikes in rat DRG neurons. Moreover, peripheral pre-treatment with TGF-β1 dose-dependently exacerbated nociceptive behaviors evoked by intraplantar injection of acetic acid through TGF-β receptor I in rats. These results suggested that TGF-β1 potentiated ASIC-mediated electrophysiological activity and nociceptive behaviors, which revealed a novel mechanism underlying TGF-β1 implicated in peripheral pain signaling by sensitizing ASICs.
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Affiliation(s)
- Chun-Yu Qiu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, P R China.,Department of Pharmacology, Hubei University of Science and Technology, Xianning, P R China
| | - Ting-Ting Liu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, P R China
| | - Shuang Wei
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, P R China
| | - Yi-Mei Zhou
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, P R China
| | - Lei Wu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, P R China
| | - Ying Jin
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, P R China
| | - Wang-Ping Hu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, P R China
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16
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Wu J, Wang JJ, Liu TT, Zhou YM, Qiu CY, Shen DW, Hu WP. PPAR-α acutely inhibits functional activity of ASICs in rat dorsal root ganglion neurons. Oncotarget 2017; 8:93051-93062. [PMID: 29190977 PMCID: PMC5696243 DOI: 10.18632/oncotarget.21805] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 08/29/2017] [Indexed: 12/29/2022] Open
Abstract
Peroxisome proliferator-activated receptor-α (PPAR-α), a lipid activated transcription factor of nuclear hormone receptor superfamily, can relieve pain through a rapid-response mechanism. However, little is known about the underlying mechanism. Herein, we report that PPAR-α activation acutely inhibits the functional activity of acid-sensing ion channels (ASICs), key sensors for extracellular protons, in rat dorsal root ganglion (DRG) neurons. Pre-application of PPAR-α agonist GW7647 for 2 min decreased the amplitude of proton-gated currents mediated by ASICs in a concentration-dependent manner. GW7647 shifted the concentration-response curve for proton downwards, with a decrease of 36.9 ± 2.3% in the maximal current response to proton. GW7647 inhibition of proton-gated currents can be blocked by GW6471, a selective PPAR-α antagonist. Moreover, PPAR-α activation decreased the number of acidosis-evoked action potentials in rat DRG neurons. Finally, peripheral administration of GW7647 dose-dependently relieved nociceptive responses to injection of acetic acid in rats. These results indicated that activation of peripheral PPAR-α acutely inhibited functional activity of ASICs in a non-genomic manner, which revealed a novel mechanism underlying rapid analgesia through peripheral PPAR-α.
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Affiliation(s)
- Jing Wu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning 437100, Hubei, P.R. China
| | - Jia-Jia Wang
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning 437100, Hubei, P.R. China
| | - Ting-Ting Liu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning 437100, Hubei, P.R. China.,Department of Physiology, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning 437100, Hubei, P.R. China
| | - Yi-Mei Zhou
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning 437100, Hubei, P.R. China
| | - Chun-Yu Qiu
- Department of Pharmacology, Hubei University of Science and Technology, Xianning 437100, Hubei, P.R. China
| | - Ding-Wen Shen
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning 437100, Hubei, P.R. China
| | - Wang-Ping Hu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning 437100, Hubei, P.R. China.,Department of Physiology, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning 437100, Hubei, P.R. China
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Hu WP, Zhang J, Qu JM. [The role of nemonoxacin in the treatment of community acquired pneumonia]. Zhonghua Jie He He Hu Xi Za Zhi 2017; 40:775-777. [PMID: 29050134 DOI: 10.3760/cma.j.issn.1001-0939.2017.10.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
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18
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Wu J, Liu TT, Zhou YM, Qiu CY, Ren P, Jiao M, Hu WP. Sensitization of ASIC3 by proteinase-activated receptor 2 signaling contributes to acidosis-induced nociception. J Neuroinflammation 2017; 14:150. [PMID: 28754162 PMCID: PMC5534107 DOI: 10.1186/s12974-017-0916-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Accepted: 07/11/2017] [Indexed: 02/07/2023] Open
Abstract
Background Tissue acidosis and inflammatory mediators play critical roles in pain. Pro-inflammatory agents trypsin and tryptase cleave and activate proteinase-activated receptor 2 (PAR2) expressed on sensory nerves, which is involved in peripheral mechanisms of inflammation and pain. Extracellular acidosis activates acid-sensing ion channel 3 (ASIC3) to trigger pain sensation. Here, we show that a functional interaction of PAR2 and ASIC3 could contribute to acidosis-induced nociception. Methods Electrophysiological experiments were performed on both rat DRG neurons and Chinese hamster ovary (CHO) cells expressing ASIC3 and PAR2. Nociceptive behavior was induced by acetic acid in rats. Results PAR2-AP, PAR2-activating peptide, concentration-dependently increased the ASIC3 currents in CHO cells transfected with ASIC3 and PAR2. The proton concentration–response relationship was not changed, but that the maximal response increased 58.7 ± 3.8% after pretreatment of PAR2-AP. PAR2 mediated the potentiation of ASIC3 currents via an intracellular cascade. PAR2-AP potentiation of ASIC3 currents disappeared after inhibition of intracellular G protein, PLC, PKC, or PKA signaling. Moreover, PAR2 activation increased proton-evoked currents and spikes mediated by ASIC3 in rat dorsal root ganglion neurons. Finally, peripheral administration of PAR2-AP dose-dependently exacerbated acidosis-induced nocifensive behaviors in rats. Conclusions These results indicated that PAR2 signaling sensitized ASIC3, which may contribute to acidosis-induced nociception. These represent a novel peripheral mechanism underlying PAR2 involvement in hyperalgesia by sensitizing ASIC3 in primary sensory neurons.
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Affiliation(s)
- Jing Wu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Ting-Ting Liu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China.,Department of Physiology, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Yi-Mei Zhou
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Chun-Yu Qiu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Ping Ren
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Ming Jiao
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China.
| | - Wang-Ping Hu
- Research Center of Basic Medical Sciences, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China. .,Department of Physiology, School of Basic Medical Sciences, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China.
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Sun YY, Hu WP, Liu ZX, Wang W. [Effects of Wnt3a on osteogenic differentiation of dental pulp stem cells]. Zhonghua Kou Qiang Yi Xue Za Zhi 2017; 52:427-431. [PMID: 29972907 DOI: 10.3760/cma.j.issn.1002-0098.2017.07.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the effect of Wnt3a on osteogenic differentiation of human dental pulp stem cells (DPSC). Methods: DPSCs were subjected to different concentrations of Wnt3a (0, 5, 20, 50 and 100 μg/L) and at seven days after culture the alkaline phosphatase (ALP) activity was tested. Mineralized nodule formation was examined by alizarin red staining. Osteogenic-related gene expression of bone sialoprotein (BSP), osteocalcin (OCN), collagen type Ⅰ (COL-Ⅰ), Runt-related transcription factor-2 (RUNX2) was examined by quantitative real-time PCR (qPCR). Results: After seven days of induction by DPSC, Wnt3a protein could inhibit the ALP activity (concentration 0: 1.076±0.203, 5 μg/L: 0.828±0.118, 20 μg/L: 0.505±0.044, 50 μg/L: 0.499±0.038, 100 μg/L: 0.483±0.060). The expression of OCN in 5 μg/L Wnt3a group (0.092±0.005) was lower than that in culture medium (0.858±0.190)(P<0.05). Alizarin red staining showed that 5 μg/L Wnt3a had no mineralization induction effect on DPSC. Conclusions: Wnt3a could inhibit osteogenic differentiation of dental pulp stem cells.
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Affiliation(s)
- Y Y Sun
- Department of Prosthodontics, Xuzhou Stomatology Hospital, Xuzhou Jiangsu 221000, China
| | - W P Hu
- Department of Prosthodontics, The Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
| | - Z X Liu
- Department of Periodontics, Xuzhou Stomatology Hospital, Xuzhou Jiangsu 221000, China
| | - W Wang
- Department of Prosthodontics, Xuzhou Stomatology Hospital, Xuzhou Jiangsu 221000, China
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Li LH, Hu WP, Zhang ZL, Liu JG, Luo G, Liu YH. [The adhesion separation operation with CO₂ laser combined withtriamcinolone acetonide vocal cord submucosal injection for the treatment to vocal cord adhesion]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2017; 31:700-702. [PMID: 29871351 DOI: 10.13201/j.issn.1001-1781.2017.09.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Indexed: 11/12/2022]
Abstract
Objective:To investigate the effect of adhesion separation operation with CO₂ laser via prop-up laryngoscope combine with triamcinolone acetonide submucosal injection via electrolaryngoscope to vocal cords adhesion.Method:Sixteen cases of vocal cord adhesion patients(2 cases of children,14 cases of adult) were enrolled in the study. Fourteen patients had the history of surgery(Reinke edema,vocal polyp,pediatric laryngeal papilloma,laryngeal cancer),2 cases were diagnosed as laryngeal tuberculosis. Adhesion separation operation and triamcinolone acetonide submucosal injection(once a week,three weeks) were conducted. All patients were examined with electronic laryngoscope every month for six monthes.Result:Fourteen patients had good triangle shape of glottis vocalis and good sound voice. One cases of laryngeal cancer and 1 cases of laryngeal tuberculosis patients still had adhesion in the anterior commissure of the vocal cords,but with the improvement in breathing and pronunciation.Conclusion:Adhesion separation operation with CO₂ laser via prop-up laryngoscope combine with triamcinolone acetonide submucosal injection via electrolaryngoscope were effective for treatment to vocal cord adhesion,whichimprove the patient's breathing and voice with little trauma and few complications.
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Affiliation(s)
- L H Li
- Department of Otorhinolaryngology,the Second Affiliated Hospital of Nanchang University,Nanchang,330006,China
| | - W P Hu
- Department of Otorhinolaryngology,Ningdu County People's Hospital
| | - Z L Zhang
- Department of Otorhinolaryngology,the Second Affiliated Hospital of Nanchang University,Nanchang,330006,China
| | - J G Liu
- Department of Otorhinolaryngology,the Second Affiliated Hospital of Nanchang University,Nanchang,330006,China
| | - G Luo
- Department of Otorhinolaryngology,the Second Affiliated Hospital of Nanchang University,Nanchang,330006,China
| | - Y H Liu
- Department of Otorhinolaryngology,the Second Affiliated Hospital of Nanchang University,Nanchang,330006,China
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Gan X, Wu J, Ren C, Qiu CY, Li YK, Hu WP. Potentiation of acid-sensing ion channel activity by peripheral group I metabotropic glutamate receptor signaling. Pharmacol Res 2016; 107:19-26. [PMID: 26946972 DOI: 10.1016/j.phrs.2016.02.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Revised: 01/08/2016] [Accepted: 02/15/2016] [Indexed: 01/15/2023]
Abstract
Glutamate activates peripheral group I metabotropic glutamate receptors (mGluRs) and contributes to inflammatory pain. However, it is still not clear the mechanisms are involved in group I mGluR-mediated peripheral sensitization. Herein, we report that group I mGluRs signaling sensitizes acid-sensing ion channels (ASICs) in dorsal root ganglion (DRG) neurons and contributes to acidosis-evoked pain. DHPG, a selective group I mGluR agonist, can potentiate the functional activity of ASICs, which mediated the proton-induced events. DHPG concentration-dependently increased proton-gated currents in DRG neurons. It shifted the proton concentration-response curve upwards, with a 47.3±7.0% increase of the maximal current response to proton. Group I mGluRs, especially mGluR5, mediated the potentiation of DHPG via an intracellular cascade. DHPG potentiation of proton-gated currents disappeared after inhibition of intracellular Gq/11 proteins, PLCβ, PKC or PICK1 signaling. Moreover, DHPG enhanced proton-evoked membrane excitability of rat DRG neurons and increased the amplitude of the depolarization and the number of spikes induced by acid stimuli. Finally, peripherally administration of DHPG dose-dependently exacerbated nociceptive responses to intraplantar injection of acetic acid in rats. Potentiation of ASIC activity by group I mGluR signaling in rat DRG neurons revealed a novel peripheral mechanism underlying group I mGluRs involvement in hyperalgesia.
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Affiliation(s)
- Xiong Gan
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, Hubei 437100, PR China
| | - Jing Wu
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, Hubei 437100, PR China
| | - Cuixia Ren
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, Hubei 437100, PR China
| | - Chun-Yu Qiu
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, Hubei 437100, PR China
| | - Yan-Kun Li
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, Hubei 437100, PR China
| | - Wang-Ping Hu
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, Hubei 437100, PR China.
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Qu ZW, Liu TT, Ren C, Gan X, Qiu CY, Ren P, Rao Z, Hu WP. 17β-Estradiol Enhances ASIC Activity in Primary Sensory Neurons to Produce Sex Difference in Acidosis-Induced Nociception. Endocrinology 2015; 156:4660-71. [PMID: 26441237 DOI: 10.1210/en.2015-1557] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Sex differences have been reported in a number of pain conditions. Women are more sensitive to most types of painful stimuli than men, and estrogen plays a key role in the sex differences in pain perception. However, it is unclear whether there is a sex difference in acidosis-evoked pain. We report here that both male and female rats exhibit nociceptive behaviors in response to acetic acid, with females being more sensitive than males. Local application of exogenous 17β-estradiol (E2) exacerbated acidosis-evoked nociceptive response in male rats. E2 and estrogen receptor (ER)-α agonist 1,3,5-Tris(4-hydroxyphenyl)-4-propyl-1H-pyrazole, but not ERβ agonist 2,3-bis(4-hydroxyphenyl)-propionitrile, replacement also reversed attenuation of the acetic acid-induced nociceptive response in ovariectomized females. Moreover, E2 can exert a rapid potentiating effect on the functional activity of acid-sensing ion channels (ASICs), which mediated the acidosis-induced events. E2 dose dependently increased the amplitude of ASIC currents with a 42.8 ± 1.6 nM of EC50. E2 shifted the concentration-response curve for proton upward with a 50.1% ± 6.2% increase of the maximal current response to proton. E2 potentiated ASIC currents via an ERα and ERK1/2 signaling pathway. E2 also altered acidosis-evoked membrane excitability of dorsal root ganglia neurons and caused a significant increase in the amplitude of the depolarization and the number of spikes induced by acidic stimuli. E2 potentiation of the functional activity of ASICs revealed a peripheral mechanism underlying this sex difference in acetic acid-induced nociception.
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Affiliation(s)
- Zu-Wei Qu
- Institute of Ion Channels (Z.-W.Q., T.-T.L., C.R., X.G., C.-Y.Q., P.R., W.-P.H.), Department of Pharmacology, Hubei University of Science and Technology, Xianning 437100, Hubei, People's Republic of China; and Department of Oncology (Z.R.), Wuhan of General Hospital of Guangzhou, People's Liberation Army, Wuhan 430070, People's Republic of China
| | - Ting-Ting Liu
- Institute of Ion Channels (Z.-W.Q., T.-T.L., C.R., X.G., C.-Y.Q., P.R., W.-P.H.), Department of Pharmacology, Hubei University of Science and Technology, Xianning 437100, Hubei, People's Republic of China; and Department of Oncology (Z.R.), Wuhan of General Hospital of Guangzhou, People's Liberation Army, Wuhan 430070, People's Republic of China
| | - Cuixia Ren
- Institute of Ion Channels (Z.-W.Q., T.-T.L., C.R., X.G., C.-Y.Q., P.R., W.-P.H.), Department of Pharmacology, Hubei University of Science and Technology, Xianning 437100, Hubei, People's Republic of China; and Department of Oncology (Z.R.), Wuhan of General Hospital of Guangzhou, People's Liberation Army, Wuhan 430070, People's Republic of China
| | - Xiong Gan
- Institute of Ion Channels (Z.-W.Q., T.-T.L., C.R., X.G., C.-Y.Q., P.R., W.-P.H.), Department of Pharmacology, Hubei University of Science and Technology, Xianning 437100, Hubei, People's Republic of China; and Department of Oncology (Z.R.), Wuhan of General Hospital of Guangzhou, People's Liberation Army, Wuhan 430070, People's Republic of China
| | - Chun-Yu Qiu
- Institute of Ion Channels (Z.-W.Q., T.-T.L., C.R., X.G., C.-Y.Q., P.R., W.-P.H.), Department of Pharmacology, Hubei University of Science and Technology, Xianning 437100, Hubei, People's Republic of China; and Department of Oncology (Z.R.), Wuhan of General Hospital of Guangzhou, People's Liberation Army, Wuhan 430070, People's Republic of China
| | - Ping Ren
- Institute of Ion Channels (Z.-W.Q., T.-T.L., C.R., X.G., C.-Y.Q., P.R., W.-P.H.), Department of Pharmacology, Hubei University of Science and Technology, Xianning 437100, Hubei, People's Republic of China; and Department of Oncology (Z.R.), Wuhan of General Hospital of Guangzhou, People's Liberation Army, Wuhan 430070, People's Republic of China
| | - Zhiguo Rao
- Institute of Ion Channels (Z.-W.Q., T.-T.L., C.R., X.G., C.-Y.Q., P.R., W.-P.H.), Department of Pharmacology, Hubei University of Science and Technology, Xianning 437100, Hubei, People's Republic of China; and Department of Oncology (Z.R.), Wuhan of General Hospital of Guangzhou, People's Liberation Army, Wuhan 430070, People's Republic of China
| | - Wang-Ping Hu
- Institute of Ion Channels (Z.-W.Q., T.-T.L., C.R., X.G., C.-Y.Q., P.R., W.-P.H.), Department of Pharmacology, Hubei University of Science and Technology, Xianning 437100, Hubei, People's Republic of China; and Department of Oncology (Z.R.), Wuhan of General Hospital of Guangzhou, People's Liberation Army, Wuhan 430070, People's Republic of China
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Ren C, Gan X, Wu J, Qiu CY, Hu WP. Enhancement of acid-sensing ion channel activity by metabotropic P2Y UTP receptors in primary sensory neurons. Purinergic Signal 2015; 12:69-78. [PMID: 26538146 DOI: 10.1007/s11302-015-9479-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Accepted: 10/23/2015] [Indexed: 12/16/2022] Open
Abstract
Peripheral purinergic signaling plays an important role in nociception. Increasing evidence suggests that metabotropic P2Y receptors are also involved, but little is known about the underlying mechanism. Herein, we report that selective P2Y receptor agonist uridine 5'-triphosphate (UTP) can exert an enhancing effect on the functional activity of acid-sensing ion channels (ASICs), key sensors for extracellular protons, in rat dorsal root ganglia (DRG) neurons. First, UTP dose-dependently increased the amplitude of ASIC currents. UTP also shifted the concentration-response curve for proton upwards, with a 56.6 ± 6.4% increase of the maximal current response to proton. Second, UTP potentiation of proton-gated currents can be mimicked by adenosine 5'-triphosphate (ATP), but not by P2Y1 receptor agonist ADP. Potentiation of UTP was blocked by P2Y receptor antagonist suramin and by inhibition of intracellular G protein, phospholipase C (PLC), protein kinase C (PKC), or protein interacting with C-kinase 1 (PICK1) signaling. Third, UTP altered acidosis-evoked membrane excitability of DRG neurons and caused a significant increase in the amplitude of the depolarization and the number of spikes induced by acid stimuli. Finally, UTP dose-dependently exacerbated nociceptive responses to injection of acetic acid in rats. These results suggest that UTP enhanced ASIC-mediated currents and nociceptive responses, which reveal a novel peripheral mechanism underlying UTP-sensitive P2Y2 receptor involvement in hyperalgesia by sensitizing ASICs in primary sensory neurons.
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Affiliation(s)
- Cuixia Ren
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Xiong Gan
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Jing Wu
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Chun-Yu Qiu
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China
| | - Wang-Ping Hu
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, People's Republic of China.
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Liu TT, Qu ZW, Ren C, Gan X, Qiu CY, Hu WP. Prolactin potentiates the activity of acid-sensing ion channels in female rat primary sensory neurons. Neuropharmacology 2015; 103:174-82. [PMID: 26188144 DOI: 10.1016/j.neuropharm.2015.07.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 07/13/2015] [Accepted: 07/14/2015] [Indexed: 02/06/2023]
Abstract
Prolactin (PRL) is a polypeptide hormone produced and released from the pituitary and extrapituitary tissues. It regulates activity of nociceptors and causes hyperalgesia in pain conditions, but little is known the molecular mechanism. We report here that PRL can exert a potentiating effect on the functional activity of acid-sensing ion channels (ASICs), key sensors for extracellular protons. First, PRL dose-dependently increased the amplitude of ASIC currents with an EC50 of (5.89 ± 0.28) × 10(-8) M. PRL potentiation of ASIC currents was also pH dependent. Second, PRL potentiation of ASIC currents was blocked by Δ1-9-G129R-hPRL, a PRL receptor antagonist, and removed by intracellular dialysis of either protein kinase C inhibitor GF109203X, protein interacting with C-kinase 1(PICK1) inhibitor FSC-231, or PI3K inhibitor AS605240. Third, PRL altered acidosis-evoked membrane excitability of DRG neurons and caused a significant increase in the amplitude of the depolarization and the number of spikes induced by acid stimuli. Four, PRL exacerbated nociceptive responses to injection of acetic acid in female rats. Finally, PRL displayed a stronger effect on ASIC mediated-currents and nociceptive behavior in intact female rats than OVX female and male rats and thus modulation of PRL may be gender-dependent. These results suggest that PRL up-regulates the activity of ASICs and enhances ASIC mediated nociceptive responses in female rats, which reveal a novel peripheral mechanism underlying PRL involvement in hyperalgesia.
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Affiliation(s)
- Ting-Ting Liu
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Zu-Wei Qu
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Cuixia Ren
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Xiong Gan
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Chun-Yu Qiu
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China.
| | - Wang-Ping Hu
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China.
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Cao GL, Feng T, Chu MX, Di R, Zhang YL, Huang DW, Liu QY, Hu WP, Wang XY. Subtraction suppressive hybridisation analysis of differentially expressed genes associated with puberty in the goat hypothalamus. Reprod Fertil Dev 2015; 28:RD14434. [PMID: 25976271 DOI: 10.1071/rd14434] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Accepted: 04/13/2015] [Indexed: 01/19/2023] Open
Abstract
The cost of developing replacement nanny goats could be reduced by decreasing the age at puberty because this way nanny goats could be brought into production at an earlier age. The aim of the present study was to screen genes related to puberty to investigate the molecular mechanisms of puberty. Subtracted cDNA libraries were constructed for hypothalami from juvenile (Group A), pubertal (Group B) and age-matched control pubertal (Group E) Jining grey (JG) and Liaoning cashmere (LC) goats using suppression subtractive hybridisation (SSH). Differentially expressed genes were analysed by bioinformatics methods. There were 203 expressed sequence tags (ESTs) in the subtracted cDNA libraries that were differentially expressed between JG and LC goats at the juvenile stage, 226 that were differentially expressed at puberty and 183 that were differentially expressed in the age-matched control group. The differentially expressed ESTs in each subtracted cDNA library were classified as known gene, known EST and unknown EST according to sequence homology in the GenBank non-redundant (NR) and EST database. According to gene function analysis in the COG (Cluster of Orthologous Groups) database, the known genes were grouped into 10 subdivisions in Group A, into seven subdivisions in Group E and into nine subdivisions in Group B under three categories: cellular processes and signalling, information storage and processing, and metabolism. Pathway analysis in the KEGG (Kyoto Encyclopedia of Genes and Genomes) pathway database of known genes revealed that the three pathways that most differentially expressed genes were involved in were metabolic pathways, Parkinson's disease and oxidative phosphorylation. Protein interaction analysis of the high homology genes revealed the most dominant network to be structure of ribosome/protein translation, oxidative phosphorylation and carbohydrate metabolism. The results reveal that the onset of puberty is a complex event involving multiple genes in multiple biological processes. The differentially expressed genes include genes related to both neuroendocrine and energy metabolism.
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Peng F, Qu ZW, Qiu CY, Liao M, Hu WP. Spinal vasopressin alleviates formalin-induced nociception by enhancing GABAA receptor function in mice. Neurosci Lett 2015; 593:61-5. [PMID: 25782631 DOI: 10.1016/j.neulet.2015.03.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 03/06/2015] [Accepted: 03/13/2015] [Indexed: 12/18/2022]
Abstract
Arginine vasopressin (AVP) plays a regulatory role in nociception. Intrathecal administration of AVP displays an antinociceptive effect. However, little is understood about the mechanism underlying spinal AVP analgesia. Here, we have found that spinal AVP dose dependently reduced the second, but not first, phase of formalin-induced spontaneous nociception in mice. The AVP analgesia was completely blocked by intrathecal injected SR 49059, a vasopressin-1A (V1A) receptor antagonist. However, spinal AVP failed to exert its antinociceptive effect on the second phase formalin-induced spontaneous nociception in V1A receptor knock-out (V1A-/-) mice. The AVP analgesia was also reversed by bicuculline, a GABAA receptor antagonist. Moreover, AVP potentiated GABA-activated currents in dorsal root ganglion neurons from wild-type littermates, but not from V1A-/- mice. Our results may reveal a novel spinal mechanism of AVP analgesia by enhancing the GABAA receptor function in the spinal cord through V1A receptors.
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Affiliation(s)
- Fang Peng
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China; Department of Anatomy and Histology & Embryology, College of Basic Medicine, Wenzou Medical University, Wenzou 32500, Zhejiang, PR China
| | - Zu-Wei Qu
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Chun-Yu Qiu
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Min Liao
- Department of Anatomy and Histology & Embryology, College of Basic Medicine, Wenzou Medical University, Wenzou 32500, Zhejiang, PR China.
| | - Wang-Ping Hu
- Institute of Ion Channels, Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China.
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Qiu F, Qiu CY, Cai H, Liu TT, Qu ZW, Yang Z, Li JD, Zhou QY, Hu WP. Oxytocin inhibits the activity of acid-sensing ion channels through the vasopressin, V1A receptor in primary sensory neurons. Br J Pharmacol 2015; 171:3065-76. [PMID: 24641084 DOI: 10.1111/bph.12635] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 01/01/2014] [Accepted: 02/04/2014] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND AND PURPOSE A growing number of studies have demonstrated that oxytocin (OT) plays an analgesic role in modulation of nociception and pain. Most work to date has focused on the central mechanisms of OT analgesia, but little is known about whether peripheral mechanisms are also involved. Acid-sensing ion channels (ASICs) are distributed in peripheral sensory neurons and participate in nociception. Here, we investigated the effects of OT on the activity of ASICs in dorsal root ganglion (DRG) neurons. EXPERIMENTAL APPROACH Electrophysiological experiments were performed on neurons from rat DRG. Nociceptive behaviour was induced by acetic acid in rats and mice lacking vasopressin, V1A receptors. KEY RESULTS OT inhibited the functional activity of native ASICs. Firstly, OT dose-dependently decreased the amplitude of ASIC currents in DRG neurons. Secondly, OT inhibition of ASIC currents was mimicked by arginine vasopressin (AVP) and completely blocked by the V1A receptor antagonist SR49059, but not by the OT receptor antagonist L-368899. Thirdly, OT altered acidosis-evoked membrane excitability of DRG neurons and significantly decreased the amplitude of the depolarization and number of action potentials induced by acid stimuli. Finally, peripherally administered OT or AVP inhibited nociceptive responses to intraplantar injection of acetic acid in rats. Both OT and AVP also induced an analgesic effect on acidosis-evoked pain in wild-type mice, but not in V1A receptor knockout mice. CONCLUSIONS AND IMPLICATIONS These results reveal a novel peripheral mechanism for the analgesic effect of OT involving the modulation of native ASICs in primary sensory neurons mediated by V1A receptors.
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Affiliation(s)
- Fang Qiu
- Department of Pharmacology, Hubei University of Science and Technology, Xianning, China; College of Life Sciences, Hubei University, Wuhan, China
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Qiu F, Hu WP, Yang ZF. Enhancement of GABA-activated currents by arginine vasopressin in rat dorsal root ganglion neurons. Sheng Li Xue Bao 2014; 66:647-657. [PMID: 25516513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A growing number of studies have shown that arginine vasopressin (AVP) plays an analgesia role in the modulation of nociception. Previous studies have focused on the central mechanisms of AVP analgesia. The aim of the present study was to find out whether peripheral mechanisms are also involved. The effect of AVP on GABA-activated currents (IGABA) and GABAA receptor function in freshly isolated dorsal root ganglion (DRG) neurons of rats were studied using whole cell patch clamp technique. The result showed that, IGABA were potentiated by pre-treatment with AVP (1 × 10⁻¹⁰-1 × 10⁻⁵ mol/L) in a concentration-dependent manner. Meanwhile, the GABA concentration-response curve was shifted upwards, with an increase of (49.1 ± 4.0)% in the maximal current response but with no significant change in the EC50 values. These results indicate that the enhancing effect is non-competitive. In addition, the effects of AVP on IGABA might be voltage-independent. This potentiation of IGABA induced by AVP was almost completely blocked by the V1a receptor antagonist SR49059 (3 × 10⁻⁶ mol/L). Also it could be removed by intracellular dialysis of either GDP-β-S (5 × 10⁻⁴mol/L), a non-hydrolyzable GDP analog, or GF109203X (2 × 10⁻⁶ mol/L), a selective protein kinase C (PKC) inhibitor, with the re-patch clamp. These results suggest that AVP up-regulates the function of the GABAA receptor via G protein-coupled receptors and PKC-dependent signal pathways in rat DRG neurons, and this potentiation may underlie the analgesia induced by AVP.
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Affiliation(s)
- Fang Qiu
- Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, College of Life Sciences, Hubei University, Wuhan 430062, China; Department of Pharmacology, Hubei University of Science and Technology, Xianning 437100, China.
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Liu TT, Qu ZW, Qiu CY, Qiu F, Ren C, Gan X, Peng F, Hu WP. Inhibition of acid-sensing ion channels by levo-tetrahydropalmatine in rat dorsal root ganglion neurons. J Neurosci Res 2014; 93:333-9. [DOI: 10.1002/jnr.23484] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Revised: 06/16/2014] [Accepted: 08/20/2014] [Indexed: 12/19/2022]
Affiliation(s)
- Ting-Ting Liu
- Institute of Ion Channels, Department of Pharmacology; Hubei University of Science and Technology; Hubei People's Republic of China
| | - Zu-Wei Qu
- Institute of Ion Channels, Department of Pharmacology; Hubei University of Science and Technology; Hubei People's Republic of China
| | - Chun-Yu Qiu
- Institute of Ion Channels, Department of Pharmacology; Hubei University of Science and Technology; Hubei People's Republic of China
| | - Fang Qiu
- Institute of Ion Channels, Department of Pharmacology; Hubei University of Science and Technology; Hubei People's Republic of China
| | - Cuixia Ren
- Institute of Ion Channels, Department of Pharmacology; Hubei University of Science and Technology; Hubei People's Republic of China
| | - Xiong Gan
- Institute of Ion Channels, Department of Pharmacology; Hubei University of Science and Technology; Hubei People's Republic of China
| | - Fang Peng
- Institute of Ion Channels, Department of Pharmacology; Hubei University of Science and Technology; Hubei People's Republic of China
| | - Wang-Ping Hu
- Institute of Ion Channels, Department of Pharmacology; Hubei University of Science and Technology; Hubei People's Republic of China
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Qu ZW, Liu TT, Qiu CY, Li JD, Hu WP. Inhibition of acid-sensing ion channels by chlorogenic acid in rat dorsal root ganglion neurons. Neurosci Lett 2014; 567:35-9. [PMID: 24680850 DOI: 10.1016/j.neulet.2014.03.027] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Revised: 03/15/2014] [Accepted: 03/17/2014] [Indexed: 12/22/2022]
Abstract
Chlorogenic acid (CGA) is one of the most abundant polyphenol compounds in the human diet. Recently, it is demonstrated to have potent antinociceptive effect. However, little is understood about the mechanism underlying CGA analgesia. Here, we have found that CGA can exert an inhibitory effect on the functional activity of native acid-sensing ion channels (ASICs) in rat dorsal root ganglion (DRG) neurons. First, CGA decreased the peak amplitude of proton-gated currents mediated by ASICs in a concentration-dependent manner. Second, CGA shifted the proton concentration-response curve downward, with a decrease of 41.76 ± 8.65% in the maximum current response to protons but with no significant change in the pH0.5 value. Third, CGA altered acidosis-evoked membrane excitability of rat DRG neurons and caused a significant decrease in the amplitude of the depolarization and the number of action potentials induced by acid stimuli. Finally, peripheral administered CGA attenuated nociceptive response to intraplantar injection of acetic acid in rats. ASICs are distributed in peripheral sensory neurons and participate in nociception. Our findings CGA inhibition of native ASICs indicated that CGA may exert analgesic action by modulating ASICs in the primary afferent neurons, which revealed a novel cellular and molecular mechanism underlying CGA analgesia.
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Affiliation(s)
- Zu-Wei Qu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China
| | - Ting-Ting Liu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China
| | - Chun-Yu Qiu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China
| | - Jia-Da Li
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China
| | - Wang-Ping Hu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, 437100, Hubei, PR China.
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Qiu F, Liu TT, Qu ZW, Qiu CY, Yang Z, Hu WP. Gastrodin inhibits the activity of acid-sensing ion channels in rat primary sensory neurons. Eur J Pharmacol 2014; 731:50-7. [PMID: 24642360 DOI: 10.1016/j.ejphar.2014.02.044] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Revised: 01/23/2014] [Accepted: 02/23/2014] [Indexed: 01/24/2023]
Abstract
Acid-sensing ion channels (ASICs), a family of proton-gated cation channels, are believed to mediate pain caused by extracellular acidification. Gastrodin is a main bioactive constituent of the traditional herbal Gastrodia elata Blume, which has been widely used in Oriental countries for centuries. As an analgesic, gastrodin has been used clinically to treat pain such as migraine and headache. However, the mechanisms underlying analgesic action of gastrodin are still poorly understood. Here, we have found that gastrodin inhibited the activity of native ASICs in rat dorsal root ganglion (DRG) neurons. Gastrodin dose-dependently inhibited proton-gated currents mediated by ASICs. Gastrodin shifted the proton concentration-response curve downwards, with a decrease of 36.92 ± 6.23% in the maximum current response but with no significant change in the pH0.5 value. Moreover, gastrodin altered acid-evoked membrane excitability of rat DRG neurons and caused a significant decrease in the amplitude of the depolarization and the number of action potentials induced by acid stimuli. Finally, peripheral applied gastrodin relieved pain evoked by intraplantar injection of acetic acid in rats. Our results indicate that gastrodin can inhibit the activity of ASICs in the primary sensory neurons, which provided a novel mechanism underlying analgesic action of gastrodin.
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Affiliation(s)
- Fang Qiu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China; College of Life Sciences, Hubei University, Wuhan 430062, Hubei, PR China
| | - Ting-Ting Liu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Zu-Wei Qu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Chun-Yu Qiu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Zhifan Yang
- College of Life Sciences, Hubei University, Wuhan 430062, Hubei, PR China
| | - Wang-Ping Hu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China.
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Cai Q, Qiu CY, Qiu F, Liu TT, Qu ZW, Liu YM, Hu WP. Morphine inhibits acid-sensing ion channel currents in rat dorsal root ganglion neurons. Brain Res 2014; 1554:12-20. [PMID: 24491633 DOI: 10.1016/j.brainres.2014.01.042] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Revised: 01/18/2014] [Accepted: 01/24/2014] [Indexed: 02/08/2023]
Abstract
Extracellular acidosis is a common feature in pain-generating pathological conditions. Acid-sensing ion channels (ASICs), pH sensors, are distributed in peripheral sensory neurons and participate in nociception. Morphine exerts potent analgesic effects through the activation of opioid receptors for various pain conditions. A cross-talk between ASICs and opioid receptors in peripheral sensory neurons has not been shown so far. Here, we have found that morphine inhibits the activity of native ASICs in rat dorsal root ganglion (DRG) neurons. Morphine dose-dependently inhibited proton-gated currents mediated by ASICs in the presence of the TRPV1 inhibitor capsazepine. Morphine shifted the proton concentration-response curve downwards, with a decrease of 51.4±3.8% in the maximum current response but with no significant change in the pH0.5 value. Another μ-opioid receptor agonist DAMGO induced a similar decrease in ASIC currents compared with morphine. The morphine inhibition of ASIC currents was blocked by naloxone, a specific opioid receptor antagonist. Pretreatment of forskolin, an adenylyl cyclase activator, or the addition of cAMP reversed the inhibitory effect of morphine. Moreover, morphine altered acid-evoked excitability of rat DRG neurons and decreased the number of action potentials induced by acid stimuli. Finally, peripheral applied morphine relieved pain evoked by intraplantar of acetic acid in rats. Our results indicate that morphine can inhibit the activity of ASICs via μ-opioid receptor and cAMP dependent signal pathway. These observations demonstrate a cross-talk between ASICs and opioid receptors in peripheral sensory neurons, which was a novel analgesic mechanism of morphine.
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Affiliation(s)
- Qi Cai
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China; Neurology Department, Zhongnan Hospital of Wuhan University, Wuhan 430071, Hubei, PR China
| | - Chun-Yu Qiu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Fang Qiu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Ting-Ting Liu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Zu-Wei Qu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China
| | - Yu-Min Liu
- Neurology Department, Zhongnan Hospital of Wuhan University, Wuhan 430071, Hubei, PR China.
| | - Wang-Ping Hu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning 437100, Hubei, PR China.
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Liu YQ, Qiu F, Qiu CY, Cai Q, Zou P, Wu H, Hu WP. Cannabinoids inhibit acid-sensing ion channel currents in rat dorsal root ganglion neurons. PLoS One 2012; 7:e45531. [PMID: 23029075 PMCID: PMC3446897 DOI: 10.1371/journal.pone.0045531] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Accepted: 08/21/2012] [Indexed: 12/26/2022] Open
Abstract
Local acidosis has been found in various pain-generating conditions such as inflammation and tissue injury. Cannabinoids exert a powerful inhibitory control over pain initiation via peripheral cognate receptors. However, the peripheral molecular targets responsible for the antinociceptive effects of cannabinoids are still poorly understood. Here, we have found that WIN55,212-2, a cannabinoid receptor agonist, inhibits the activity of native acid-sensing ion channels (ASICs) in rat dorsal root ganglion (DRG) neurons. WIN55,212-2 dose-dependently inhibited proton-gated currents mediated by ASICs. WIN55,212-2 shifted the proton concentration–response curve downwards, with an decrease of 48.6±3.7% in the maximum current response but with no significant change in the EC50 value. The inhibition of proton-gated current induced by WIN55,212-2 was almost completely blocked by the selective CB1 receptor antagonist AM 281, but not by the CB2 receptor antagonist AM630. Pretreatment of forskolin, an AC activator, and the addition of cAMP also reversed the inhibition of WIN55,212-2. Moreover, WIN55,212-2 altered acid-evoked excitability of rat DRG neurons and decreased the number of action potentials induced by acid stimuli. Finally, WIN55,212-2 attenuated nociceptive responses to injection of acetic acid in rats. These results suggest that WIN55,212-2 inhibits the activity of ASICs via CB1 receptor and cAMP dependent pathway in rat primary sensory neurons. Thus, cannabinoids can exert their analgesic action by interaction with ASICs in the primary afferent neurons, which was novel analgesic mechanism of cannabinoids.
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Affiliation(s)
- Yu-Qiang Liu
- Department of Pharmacology, Hubei University of Science and Technology, Xianning, Hubei, P R China
| | - Fang Qiu
- Department of Pharmacology, Hubei University of Science and Technology, Xianning, Hubei, P R China
| | - Chun-Yu Qiu
- Department of Pharmacology, Hubei University of Science and Technology, Xianning, Hubei, P R China
| | - Qi Cai
- Department of Pharmacology, Hubei University of Science and Technology, Xianning, Hubei, P R China
| | - Pengcheng Zou
- Hubei Furen Pharmaceutical Corporation Ltd, Shinanqiao, Tongcheng, Hubei, P R China
| | - Heming Wu
- Hubei Furen Pharmaceutical Corporation Ltd, Shinanqiao, Tongcheng, Hubei, P R China
| | - Wang-Ping Hu
- Department of Pharmacology, Hubei University of Science and Technology, Xianning, Hubei, P R China
- * E-mail:
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Zhou W, Li JD, Hu WP, Cheng MY, Zhou QY. Prokineticin 2 is involved in the thermoregulation and energy expenditure. ACTA ACUST UNITED AC 2012; 179:84-90. [PMID: 22960406 DOI: 10.1016/j.regpep.2012.08.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2012] [Revised: 06/28/2012] [Accepted: 08/27/2012] [Indexed: 01/26/2023]
Abstract
Animals have developed adaptive strategies to survive tough situations such as food shortage. However, the underlying molecular mechanism is not fully understood. Here, we provided evidence that the regulatory peptide prokineticin 2 (PK2) played an important role in such an adaptation. The PK2 expression was rapidly induced in the hypothalamic paraventricular nucleus (PVN) after fasting, which can be mimicked by 2-deoxy-D-glucose (2-DG) injection. The fasting-induced arousal was absent in the PK2-deficient (PK2(-/-)) mice. Furthermore, PK2(-/-) mice showed less energy expenditure and body weight loss than wild-type (WT) controls upon fasting. As a result, PK2(-/-) mice entered torpor after fasting. Supply of limited food (equal to 5% of body weight) daily during fasting rescued the body weight loss and hypothermal phenotype in WT mice, but not in PK2(-/-) mice. Our study thus demonstrated PK2 as a regulator in the thermoregulation and energy expenditure.
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Affiliation(s)
- Wenbai Zhou
- Department of Pharmacology, University of California, Irvine, CA 92697, USA
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Qiu CY, Liu YQ, Qiu F, Wu J, Zhou QY, Hu WP. Prokineticin 2 potentiates acid-sensing ion channel activity in rat dorsal root ganglion neurons. J Neuroinflammation 2012; 9:108. [PMID: 22642848 PMCID: PMC3413530 DOI: 10.1186/1742-2094-9-108] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2012] [Accepted: 05/29/2012] [Indexed: 12/16/2022] Open
Abstract
Background Prokineticin 2 (PK2) is a secreted protein and causes potent hyperalgesia in vivo, and is therefore considered to be a new pronociceptive mediator. However, the molecular targets responsible for the pronociceptive effects of PK2 are still poorly understood. Here, we have found that PK2 potentiates the activity of acid-sensing ion channels in the primary sensory neurons. Methods In the present study, experiments were performed on neurons freshly isolated from rat dorsal root ganglion by using whole-cell patch clamp and voltage-clamp recording techniques. Results PK2 dose-dependently enhanced proton-gated currents with an EC50 of 0.22 ± 0.06 nM. PK2 shifted the proton concentration-response curve upwards, with a 1.81 ± 0.11 fold increase of the maximal current response. PK2 enhancing effect on proton-gated currents was completely blocked by PK2 receptor antagonist. The potentiation was also abolished by intracellular dialysis of GF109203X, a protein kinase C inhibitor, or FSC-231, a protein interacting with C-kinase 1 inhibitor. Moreover, PK2 enhanced the acid-evoked membrane excitability of rat dorsal root ganglion neurons and caused a significant increase in the amplitude of the depolarization and the number of spikes induced by acid stimuli. Finally, PK2 exacerbated nociceptive responses to the injection of acetic acid in rats. Conclusion These results suggest that PK2 increases the activity of acid-sensing ion channels via the PK2 receptor and protein kinase C-dependent signal pathways in rat primary sensory neurons. Our findings support that PK2 is a proalgesic factor and its signaling likely contributes to acidosis-evoked pain by sensitizing acid-sensing ion channels.
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Affiliation(s)
- Chun-Yu Qiu
- Department of Pharmacology, Hubei University of Science and Technology, 88 Xianning Road, Xianning, Hubei 437100, People's Republic of China
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Ren P, Zhang H, Qiu F, Liu YQ, Gu H, O'Dowd DK, Zhou QY, Hu WP. Prokineticin 2 regulates the electrical activity of rat suprachiasmatic nuclei neurons. PLoS One 2011; 6:e20263. [PMID: 21687716 PMCID: PMC3110640 DOI: 10.1371/journal.pone.0020263] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Accepted: 04/21/2011] [Indexed: 12/11/2022] Open
Abstract
Neuropeptide signaling plays roles in coordinating cellular activities and maintaining robust oscillations within the mammalian suprachiasmatic nucleus (SCN). Prokineticin2 (PK2) is a signaling molecule from the SCN and involves in the generation of circadian locomotor activity. Prokineticin receptor 2 (PKR2), a receptor for PK2, has been shown to be expressed in the SCN. However, very little is known about the cellular action of PK2 within the SCN. In the present study, we investigated the effect of PK2 on spontaneous firing and miniature inhibitory postsynaptic currents (mIPSCs) using whole cell patch-clamp recording in the SCN slices. PK2 dose-dependently increased spontaneous firing rates in most neurons from the dorsal SCN. PK2 acted postsynaptically to reduce γ-aminobutyric acid (GABA)-ergic function within the SCN, and PK2 reduced the amplitude but not frequency of mIPSCs. Furthermore, PK2 also suppressed exogenous GABA-induced currents. And the inhibitory effect of PK2 required PKC activation in the postsynaptic cells. Our data suggest that PK2 could alter cellular activities within the SCN and may influence behavioral and physiological rhythms.
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Affiliation(s)
- Ping Ren
- Department of Pharmacology, Xianning College, Xianning, Hubei, People's Republic of China
| | - Huiping Zhang
- Family Planning Research Institute, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Fang Qiu
- Department of Pharmacology, Xianning College, Xianning, Hubei, People's Republic of China
| | - Yu-Qiang Liu
- Department of Pharmacology, Xianning College, Xianning, Hubei, People's Republic of China
| | - Huaiyu Gu
- Departments of Anatomy and Neurobiology, Developmental and Cell Biology, University of California Irvine, Irvine, California, United States of America
| | - Diane K. O'Dowd
- Departments of Anatomy and Neurobiology, Developmental and Cell Biology, University of California Irvine, Irvine, California, United States of America
| | - Qun-Yong Zhou
- Department of Pharmacology, University of California Irvine, Irvine, California, United States of America
| | - Wang-Ping Hu
- Department of Pharmacology, Xianning College, Xianning, Hubei, People's Republic of China
- * E-mail:
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Abstract
OBJECTIVES Vasoactive intestinal polypeptide (VIP) has been implicated in sleep regulation as a promoter of rapid eye movement (REM) sleep. Previous work has shown that the amount of time spent in REM sleep is increased by intracerebroventricular administration of VIP, and reduced by treatment with VIP antagonists or antibodies against VIP. A variety of evidence suggests that VIP is critical for normal expression of circadian rhythmicity of diverse physiological and behavioral parameters. In the present study, we investigated the role of this peptide in sleep regulation using VIP-deficient (VIP-/-) mice. METHODS EEG/EMG sleep-wake patterns were recorded in VIP-/- mice and their wild-type littermate controls under normal light-dark (LD), constant darkness (DD) and sleep deprivation conditions. RESULTS VIP-/- mice exhibited reduced REM sleep time over the 24-h cycle while total daily amounts of NREM sleep and wakefulness were not altered significantly. The reduced REM sleep time in VIP-/- mice occurred entirely during the day due to a reduction in the duration, but not the frequency, of REM sleep bouts. In response to sleep deprivation, compensatory rebounds in NREM sleep and REM sleep were also attenuated in VIP-/- mice. Finally, the loss of VIP altered the temporal distribution of sleep in that the VIP -/- mice exhibited smaller amplitude rhythms in total sleep, NREM sleep, and REM sleep under both LD and DD. CONCLUSIONS These results indicate that VIP regulates the duration of REM sleep, sleep homeostatic mechanisms as well as the temporal patterning of sleep.
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Affiliation(s)
- Wang-Ping Hu
- Department of Pharmacology, University of California, Irvine, CA 92697, USA
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Xiong YC, Li XM, Wang XJ, Liu YQ, Qiu F, Wu D, Gan YB, Wang BH, Hu WP. Prokineticin 2 suppresses GABA-activated current in rat primary sensory neurons. Neuropharmacology 2010; 59:589-94. [PMID: 20800074 DOI: 10.1016/j.neuropharm.2010.08.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2010] [Revised: 08/16/2010] [Accepted: 08/16/2010] [Indexed: 10/19/2022]
Abstract
Prokineticin 2 (PK2) is a newly identified regulatory protein, which is involved in a wide range of physiological processes including pain perception in mammals. However, the precise role of PK2 in nociception is yet not fully understood. Here, we investigate the effects of PK2 on GABA(A) receptor function in rat trigeminal ganglion neurons using whole-cell patch clamp technique. PK2 reversibly depressed inward currents produced by GABA(A) receptor activation (I(GABA)) with an IC₅₀ of 0.26 ± 0.02 nM. PK2 appeared to decrease the efficacy of GABA to GABA(A) receptor but not the affinity. The maximum response of the GABA dose-response curve decreased to 71.2 ± 7.0% of control after pretreatment with PK2, while the threshold value and EC₅₀ of curve did not alter significantly. The effects of PK2 on I(GABA) were voltage independent. The PK2-induced inhibition of I(GABA) was removed by intracellular dialysis of either GDP-β-S (a non-hydrolyzable GDP analog), EGTA (a Ca²+ chelator) or GF109203X (a selective protein kinase C inhibitor), but not by H89 (a protein kinase A inhibitor). These results suggest that PK2 down-regulates the function of the GABA(A) receptor via G-protein and protein kinase C dependent signal pathways in primary sensory neurons and this depression might underlie the hyperalgesia induced by PK2.
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Affiliation(s)
- Yan-Cai Xiong
- Department of Pharmacology, Xianning College, 88 Xianning Road, Xianning 437100, Hubei, PR China
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Li ZW, Zhang J, Ouyang CH, Li CY, Zhao FB, Liu YW, Ai YX, Hu WP. Potentiation by WIN 55,212-2 of GABA-activated currents in rat trigeminal ganglion neurones. Br J Pharmacol 2010; 158:1904-10. [PMID: 19917064 DOI: 10.1111/j.1476-5381.2009.00482.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
BACKGROUND AND PURPOSE Although both natural and synthetic cannabinoid compounds have been shown to exert an antinociceptive effect on acute and persistent pain, the anatomical locus of the target of cannabinoid-induced analgesia has not been fully elucidated. Here, we investigated the effects of the cannabinoid agonist WIN 55,212-2 on GABA-activated currents (I(GABA)) in rat primary sensory neurones. EXPERIMENTAL APPROACH In the present study, experiments were performed on neurones freshly isolated from rat trigeminal ganglion (TG) by using whole-cell patch clamp and repatch techniques. KEY RESULTS GABA-evoked inward currents were potentiated by pretreatment with WIN 55,212-2 in a concentration-dependent manner (10(-10)-10(-8) M). WIN 55,212-2 shifted the GABA concentration-response curve upwards, with an increase of 30.3 +/- 3.7% in the maximal current response but with no significant change in the EC(50) (agonist concentration producing a half-maximal response) value. WIN 55,212-2 potentiated the responses to GABA in a manner independent of holding potential and in the absence of any change in the reversal potential of the current. This potentiation of I(GABA) induced by WIN 55,212-2 was almost completely blocked by AM 251 (3 x 10(-8) M), a CB(1) receptor antagonist, and, using the repatch technique, was found to be abolished after intracellular dialysis with the protein kinase A (PKA) activator cAMP or the PKA inhibitor H89. CONCLUSIONS AND IMPLICATIONS The potentiation by WIN 55,212-2 of I(GABA) in primary sensory neurones may help to elucidate the mechanism underlying the modulation of analgesia by cannabinoids in the spinal dorsal horn.
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Affiliation(s)
- Zhi-Wang Li
- Wuhan Institute of Neuroscience and Drug Research, Jianghan University, Wuhan, China
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Hu WP, Ma SY, Wu JL, Li ZW. 5-Hydroxytryptamine directly inhibits neuronal nicotinic acetylcholine receptors in rat trigeminal ganglion neurons. Eur J Pharmacol 2007; 574:120-6. [PMID: 17698057 DOI: 10.1016/j.ejphar.2007.07.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2007] [Revised: 07/16/2007] [Accepted: 07/23/2007] [Indexed: 11/26/2022]
Abstract
In the present study, whole-cell patch clamp recording technique was used to investigate the action of 5-hydroxytryptamine (5-HT) on the function of native neuronal nicotinic acetylcholine receptors expressed in the rat trigeminal ganglion neurons. Inward currents (I(nic)) caused by externally-applied nicotine were observed in majority of the examined neurons, which were mediated by alpha-bungarotoxin-insensitive nicotinic acetylcholine receptors. We found that 5-HT could reversibly inhibit I(nic) in a concentration-dependent manner, and the inhibition did not involve 5-HT receptors. Other serotonergic agents, such as 2-methyl-5-HT, alpha-methyl-5-HT, sumatriptan and ICS-205,930, also had similar inhibitory effects on I(nic). 5-HT inhibited nicotinic acetylcholine receptors in a non-competitive manner, as 5-HT decreased the maximal current response to nicotine but had no effect on the threshold and EC(50). The inhibition of I(nic) by 5-HT was voltage-dependent and became stronger at hyperpolarized potentials. These results indicated that 5-HT directly inhibited nicotinic acetylcholine receptors in the trigeminal ganglion neurons. As a local modulator of the nicotinic acetylcholine receptor, 5-HT might play a role in the modulation of sensory information.
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Affiliation(s)
- Wang-Ping Hu
- Department of Physiology, Xianning College, Xianning 437100, PR China.
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Hu WP, Li JD, Zhang C, Boehmer L, Siegel JM, Zhou QY. Altered circadian and homeostatic sleep regulation in prokineticin 2-deficient mice. Sleep 2007; 30:247-56. [PMID: 17425220 PMCID: PMC2673012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/14/2023] Open
Abstract
STUDY OBJECTIVES Sleep is regulated by circadian and homeostatic processes. Recent studies with mutant mice have indicated that circadian-related genes regulate sleep amount, as well as the timing of sleep. Thus a direct link between circadian and homeostatic regulation of sleep may exist, at least at the molecular level. Prokineticin 2 (PK2), which oscillates daily with high amplitude in the suprachiasmatic nuclei (SCN), has been postulated to be an SCN output molecule. In particular, mice lacking the PK2 gene (PK2-/-) have been shown to display significantly reduced rhythmicity for a variety of circadian physiological and behavioral parameters. We investigated the role of PK2 in sleep regulation. DESIGN EEG/EMG sleep-wake patterns were recorded in PK2-/- mice and their wild-type littermate controls under baseline and challenged conditions. MEASUREMENTS AND RESULTS PK2-/- mice exhibited reduced total sleep time under entrained light-dark and constant darkness conditions. The reduced sleep time in PK2-/- mice occurred predominantly during the light period and was entirely due to a decrease in non-rapid eye movement (NREM) sleep time. However, PK2-/- mice showed increased rapid eye movement (REM) sleep time in both light and dark periods. After sleep deprivation, compensatory rebound in NREM sleep, REM sleep, and EEG delta power was attenuated in PK2-/- mice. In addition, PK2-/- mice had an impaired response to sleep disturbance caused by cage change in the light phase. CONCLUSIONS These results indicate that PK2 plays roles in both circadian and homeostatic regulation of sleep. PK2 may also be involved in maintaining the awake state in the presence of behavioral challenges.
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Affiliation(s)
- Wang-Ping Hu
- Department of Pharmacology, University of California, Irvine, CA
| | - Jia-Da Li
- Department of Pharmacology, University of California, Irvine, CA
| | - Chengkang Zhang
- Department of Pharmacology, University of California, Irvine, CA
| | - Lisa Boehmer
- Neurobiology Research 151A3, VA GLAHS Sepulveda, Department of Psychiatry and Brain Research Institute, UCLA School of Medicine, North Hills, CA
| | - Jerome M. Siegel
- Neurobiology Research 151A3, VA GLAHS Sepulveda, Department of Psychiatry and Brain Research Institute, UCLA School of Medicine, North Hills, CA
| | - Qun-Yong Zhou
- Department of Pharmacology, University of California, Irvine, CA
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Abstract
Circadian clocks drive daily rhythms in virtually all organisms. In mammals, the suprachiasmatic nucleus (SCN) is recognized as the master clock that synchronizes central and peripheral oscillators to evoke circadian rhythms of diverse physiology and behavior. How the timing information is transmitted from the SCN clock to generate overt circadian rhythms is essentially unknown. Prokineticin 2 (PK2), a clock-controlled gene that encodes a secreted protein, has been indicated as a candidate SCN clock output signal that regulates circadian locomotor rhythm. Here we report the generation and analysis of PK2-null mice. The reduction of locomotor rhythms in PK2-null mice was apparent in both hybrid and inbred genetic backgrounds. PK2-null mice also displayed significantly reduced rhythmicity for a variety of other physiological and behavioral parameters, including sleep-wake cycle, body temperature, circulating glucocorticoid and glucose levels, as well as the expression of peripheral clock genes. In addition, PK2-null mice showed accelerated acquisition of food anticipatory activity during a daytime food restriction. We conclude that PK2, acting as a SCN output factor, is important for the maintenance of robust circadian rhythms.
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Affiliation(s)
- Jia-Da Li
- Department of Pharmacology, University of California, Irvine, Irvine, California 92697
| | - Wang-Ping Hu
- Department of Pharmacology, University of California, Irvine, Irvine, California 92697
| | - Lisa Boehmer
- Neurobiology Research 151A3, Veterans Administration Greater Los Angeles Healthcare System Sepulveda, Department of Psychiatry and Brain Research Institute, University of California, Los Angeles, School of Medicine, North Hills, California 91343, and
| | - Michelle Y. Cheng
- Department of Pharmacology, University of California, Irvine, Irvine, California 92697
| | - Alex G. Lee
- Department of Pharmacology, University of California, Irvine, Irvine, California 92697
| | - Alexander Jilek
- Institute of Organic Chemistry, Johannes-Kepler-University, 4040 Linz, Austria
| | - Jerome M. Siegel
- Neurobiology Research 151A3, Veterans Administration Greater Los Angeles Healthcare System Sepulveda, Department of Psychiatry and Brain Research Institute, University of California, Los Angeles, School of Medicine, North Hills, California 91343, and
| | - Qun-Yong Zhou
- Department of Pharmacology, University of California, Irvine, Irvine, California 92697
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44
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Abstract
Prokineticins (PKs), consisting of PK1 and PK2, are a pair of newly identified regulatory peptides. Two closely related G-protein coupled receptors, PKR1 and PKR2, mediate the signaling of PKs. PKs/PKRs participate in the regulation of diverse biological processes, ranging from development to adult physiology. A number of studies have indicated the involvement of PKs/PKRs in nociception. Here we show that PK2 is a sensitizer for nociception. Intraplantar injection of recombinant PK2 resulted in a strong and localized hyperalgesia with reduced thresholds to nociceptive stimuli. PK2 mobilizes calcium in dissociated dorsal root ganglion (DRG) neurons. Mice lacking the PK2 gene displayed strong reduction in nociception induced by thermal and chemical stimuli, including capsaicin. However, PK2 mutant mice showed no difference in inflammatory response to capsaicin. As the majority of PK2-responsive DRG neurons also expressed transient receptor potential vanilloid (TRPV1) and exhibited sensitivity to capsaicin, TRPV1 is likely a significant downstream molecule of PK2 signaling. Taken together, these results reveal that PK2 sensitize nociception without affecting inflammation.
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Affiliation(s)
- Wang-Ping Hu
- Department of Pharmacology, University of California, Irvine, CA 92697, USA
| | - Chengkang Zhang
- Department of Pharmacology, University of California, Irvine, CA 92697, USA
| | - Jia-Da Li
- Department of Pharmacology, University of California, Irvine, CA 92697, USA
| | - Z David Luo
- Department of Pharmacology, University of California, Irvine, CA 92697, USA
- Department of Anesthesiology, University of California, Irvine, CA 92697, USA
| | - Silvia Amadesi
- Departments of Surgery and Physiology, University of California, San Francisco, CA 94143, USA
| | - Nigel Bunnett
- Departments of Surgery and Physiology, University of California, San Francisco, CA 94143, USA
| | - Qun-Yong Zhou
- Department of Pharmacology, University of California, Irvine, CA 92697, USA
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45
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Zhang J, Hu WP, Zhou KC, Luo JL, Fan YZ, Ru LQ, Li ZW. [Interaction of 5-HT2 and 5-HT3 receptor subtype in 5-HT-induced nociceptive responses in peripheral primary sensory nerve ending]. Zhongguo Ying Yong Sheng Li Xue Za Zhi 2006; 22:40-44. [PMID: 21186576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
AIM To study the correlation between 5-HT-induced pain response and the contribution by individual 5-HTR subtypes including 5-HT1R, 5-HT2R and 5-HT3R at the level of peripheral primary afferent. METHODS The experiments were done on acutely isolated trigeminal ganglion (TG) neurons using whole-cell patch clamp technique and the nociceptive effect was observed on behavior experiments by intraplantar injection of test drugs. RESULTS The majority of cells examined responded to 5-HT in a manner of concentration dependence (10(-6) - 10(-3) mol/) (61.4%, 54/88) and with a fast activating and rapid desensitizing inward current (I(5-HT)), which was thought to be mediated by the activation of 5-HT3R, since it could be blocked by 5-HT3R antagonist ICS 205930 and mimicked by 5-HT3R agonist 2-methyl-5-HT. It was found that I(5-HT) was potentiated by 5-HT2R agonist alpha-methyl-5-HT markedly, while 5-HT1R agonist R-(+)-UH 301 did not. In behavioral experiment performed on conscious rats, intraplantar injection of 5-HT(10(-5), 10(-4) and 10(-3) mol/L) induced an increment of cumulative lifting time first 20 min in a manner of concentration dependence. By dissociating 5-HTR subtypes using their corresponding antagonists (ICS and CYP) the potency order of hindpaw lifting time was identified as follows: 5-HT > 5-HT + ICS > 5-HT + CYP. CONCLUSION The results suggest that in 5-HT-induced nociceptive response at the primary sensory level 5-HT3R may play a role of initiation, but 5-HT2R mediates maintaining and modulatory effect in the processes of nociceptive information convey.
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Affiliation(s)
- Jian Zhang
- Department of Neurobiology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
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Hu WP, Hsu HY, Chiou A, Tseng KY, Lin HY, Chang GL, Chen SJ. Immunodetection of pentamer and modified C-reactive protein using surface plasmon resonance biosensing. Biosens Bioelectron 2006; 21:1631-7. [PMID: 16343891 DOI: 10.1016/j.bios.2005.11.001] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2005] [Revised: 11/01/2005] [Accepted: 11/02/2005] [Indexed: 11/23/2022]
Abstract
In clinical practices, the examination of pentamer C-reactive protein (pCRP) is commonly used as a prognostic indicator of the risk of a patient developing cardiovascular disease (CVD). Structural modification of pCRP produces a modified CRP (mCRP) which exhibits different biological activities in the body. In recent years, mCRP has come to be regarded as a more powerful inducer than pCRP, and hence mCRP measurement has emerged as an important indicator for assessing the risk of developing CVD. The surface plasmon resonance (SPR) biosensing technique can be employed to increase the detection accuracy and real-time response when sensing pCRP or mCRP. In this study, three monoclonal antibodies (Mabs), C8, 8D8, and 9C9, are immobilized on a protein G layer for subsequent CRP detection. The experimental results reveal that the Mab C8 reacts with both pCRP and mCRP, the Mab 8D8 with pCRP, and the Mab 9C9 with mCRP. No false signals caused by non-specific binding are observed. When detecting pCRP using Mab C8, the SPR bioassay provides sufficient sensitivity to evaluate whether or not a patient is at risk of developing CVD. SPR biosensing provides a viable and accurate approach for the real-time evaluation of pCRP and mCRP levels, and is therefore of considerable benefit in clinical examinations of CPR.
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Affiliation(s)
- W P Hu
- Institute of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan
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47
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Tan EK, Shen H, Tan JMM, Lim KL, Fook-Chong S, Hu WP, Paterson MC, Chandran VR, Yew K, Tan C, Yuen Y, Pavanni R, Wong MC, Puvan K, Zhao Y. Differential expression of splice variant and wild-type parkin in sporadic Parkinson's disease. Neurogenetics 2005; 6:179-84. [PMID: 16086186 DOI: 10.1007/s10048-005-0001-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2005] [Accepted: 06/01/2005] [Indexed: 10/25/2022]
Abstract
BACKGROUND Altered splicing of parkin under cellular stress could lead to changes in gene expression and altered protein activity. The causative role of parkin in sporadic Parkinson's disease (PD) is unknown. OBJECTIVES We described a parkin splice variant (SV) in the substantia nigra and leukocytes of sporadic PD patients. Using a case control methodology, we investigated the exon 4 SV (E4SV) and wild-type parkin expression in the leukocytes of sporadic PD patients and healthy individuals. METHODS/RESULTS We identified a parkin E4SV in the substantia nigra and leukocytes of sporadic PD patients and controls by reverse transcriptase-polymerase chain reaction (PCR). The exon 4 (122 bp) deletion resulted in a reading frame shift over the junction of exons 3-5 and a stop codon (tga) 17 bp downstream from exon 3. The translated truncated protein was associated with a total loss of the two-RING finger functional domain. Utilizing TaqMan real-time PCR with probes located across the junction of exons 3-4 or 3-5, we demonstrated an over-expression of E4SV/wild-type parkin ratio in the leukocytes of sporadic PD patients compared to age-, gender-, and race-matched controls (p<0.0005). A multivariate regression analysis demonstrated that the ratio of E4SV/wild-type parkin expression increased with age in PD patients, but this was not observed in the controls (p<0.0005). CONCLUSION The relative expression of E4SV/wild type parkin was increased in sporadic PD compared to healthy controls. Based on our observations, further functional studies to determine the pathophysiologic role of E4SV in sporadic PD patients will be of importance.
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Affiliation(s)
- E K Tan
- Department of Neurology, Singapore General Hospital, Outram Road, Singapore, 169608, Singapore.
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Hu WP, Guan BC, Ru LQ, Chen JG, Li ZW. Corrigendum to “Potentiation of 5-HT3 receptor function by the activation of coexistent 5-HT2 receptors in trigeminal ganglion neurons of rats” [Neuropharmacology 47 (2004) 833–840]. Neuropharmacology 2005. [DOI: 10.1016/j.neuropharm.2004.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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49
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Hu WP, Guan BC, Ru LQ, Chen JG, Li ZW. Potentiation of 5-HT3 receptor function by the activation of coexistent 5-HT2 receptors in trigeminal ganglion neurons of rats. Neuropharmacology 2005; 47:833-40. [PMID: 15527817 DOI: 10.1016/j.neuropharm.2004.06.015] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2004] [Accepted: 06/18/2004] [Indexed: 10/26/2022]
Abstract
5-HT receptor subtypes are widely expressed in primary sensory neurons, yet so far little is known about the interaction among them. This study aimed to investigate whether the activation of 5-HT2 and 5-HT1 receptors could modulate 5-HT3 receptor mediated current in rat trigeminal ganglion (TG) neurons using whole-cell patch clamp technique. The majority of TG neurons examined responded to 5-HT (10(-7)-10(-3) M) with a fast activating and rapid desensitizing inward current (77.2%, 71/92). This 5-HT activated current (I(5-HT)) was blocked by ICS 205-930 and mimicked by 2-methyl-5-HT, indicating that it was mediated by 5-HT3 receptor. With alpha-methyl-5-HT applied prior to 5-HT application, I(5-HT) was potentiated in a concentration-dependent manner, with the maximal modulatory effect at 10(-9) M of alpha-methyl-5-HT. The concentration-response curve for I(5-HT) pretreated with alpha-methyl-5-HT shifts upwards compared with that for I(5-HT) without alpha-methyl-5-HT pretreatment, the maximal I(5-HT) value having increased by (60.3 +/- 5.7)% of its control while the EC50 values of the two curves being very close, i.e. (2.0 +/- 0.3) x 10(-5) M vs (1.7 +/- 0.2) x 10(-5) M, respectively. The alpha-methyl-5-HT potentiation of I(5-HT) was removed by intracellular dialysis of either GDP-beta-S, a non-hydrolyzable GDP analog, or GF109203X, a selective PKC inhibitor, almost completely. Preapplication of R-(+)-UH-301, a selective agonist of 5-HT(1A) receptor, had no modulatory effect on I(5-HT). These results suggest that in the membrane of TG neurons, the activation of 5-HT2 receptors can exert an enhancing effect on the function of coexistent 5-HT3 receptors while that of 5-HT(1A) receptors cannot.
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Affiliation(s)
- Wang-Ping Hu
- Laboratory of Neuropharmacology, Department of Pharmacology, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong Road, Wuhan 430030, PR China
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Hu WP, Li ZW, Ru LQ, Fan YZ. Opposite modulatory effects of substance P on GABA-and 5-HT-activated currents in the same sensory neurons. Sheng Li Xue Bao 2004; 56:703-7. [PMID: 15614418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
The modulation by substance P of gamma-aminobutyric acid (GABA)- and 5-hydroxytryptamine (5-HT)-activated currents (I(GABA) and I(5-HT)) was studied by using patch-clamp technique in rat trigeminal ganglion (TG) neurons. The majority of neurons examined responded to GABA and 5-HT with inward currents in the same cells (63.8%, 30/47). In 22 out of 30 neurons sensitive to both GABA and 5-HT, pretreatment with substance P (SP, 0.01 micromol/L) suppressed I(GABA) by (35.7 +/-6.1)% and enhanced I(5-HT) by (65.2 +/- 8.7)%. GR 82334, a potent and specific antagonist of NK1 tachykinin receptor, reversibly blocked the modulatory effects of SP. The SP modulation on I(GABA) and I(5-HT) was also abolished by intracellular dialysis of GDP-beta-S, a non-hydrolyzable GDP analog, or GF 109203X, a selective protein kinase C inhibitor. These results suggest that SP exerts opposite modulatory actions on GABA(A) receptor and 5-HT3 receptor activity of the same primary sensory neuron via the same intracellular signal transduction pathway.
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Affiliation(s)
- Wang-Ping Hu
- Department of Neurobiology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
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