1
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Lee CH, Ha GW, Kim JH, Kim SH. Modulation in Natriuretic Peptides System in Experimental Colitis in Rats. Dig Dis Sci 2016; 61:1060-8. [PMID: 26660905 DOI: 10.1007/s10620-015-3969-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 11/08/2015] [Indexed: 12/15/2022]
Abstract
BACKGROUND Renin-angiotensin system is involved in the pathophysiology of colonic inflammation. However, there are a few reports about modulation of natriuretic peptide system. AIMS This study investigates whether a local atrial natriuretic peptide (ANP) system exists in rat colon and whether ANP plays a role in the regulation of colonic motility in experimental colitis rat model. METHODS Experimental colitis was induced by an intake of 5 % dextran sulfate sodium (DSS) dissolved in tap water for 7 days. After rats were killed, plasma hormone concentrations and mRNAs for natriuretic peptide system were measured. Functional analysis of colonic motility in response to ANP was performed using taenia coli. RESULTS DSS-treated colon showed an increased necrosis with massive infiltration of inflammatory cells. The colonic natriuretic peptide receptor-A mRNA level and particulate guanylyl cyclase activity in response to ANP from colonic tissue membranes were higher, and the mRNA levels of ANP and natriuretic peptide receptor-B were lower in DSS-treated rats than in control rats. ANP decreased the frequency of basal motility in a dose-dependent manner but did not change the amplitude. The inhibitory responses of frequency of basal motility to ANP and 8-bromo-cGMP were enhanced in DSS-treated rat colon. CONCLUSION In conclusion, augmentation of inhibitory effect on basal motility by ANP in experimental colitis may be due an increased expression of colonic natriuretic peptide receptor-A mRNA. These data suggest that local natriuretic peptide system is partly involved in the pathophysiology of experimental colitis.
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Affiliation(s)
- Chang Ho Lee
- Department of Surgery, Research Institute for Endocrine Sciences, Chonbuk National University Medical School, Jeonju, Korea
| | - Gi Won Ha
- Department of Surgery, Research Institute for Endocrine Sciences, Chonbuk National University Medical School, Jeonju, Korea
| | - Jong Hun Kim
- Department of Surgery, Research Institute for Endocrine Sciences, Chonbuk National University Medical School, Jeonju, Korea.
| | - Suhn Hee Kim
- Department of Physiology, Research Institute for Endocrine Sciences, Chonbuk National University Medical School, 20 Gunjiro, Dukjingu, Jeonju, 561-180, Korea.
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2
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Lin XL, Tang XD, Cai ZX, Wang FY, Li P, Sui H, Guo HS. NPs/NPRs Signaling Pathways May Be Involved in Depression-Induced Loss of Gastric ICC by Decreasing the Production of mSCF. PLoS One 2016; 11:e0149031. [PMID: 26862759 PMCID: PMC4749124 DOI: 10.1371/journal.pone.0149031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2015] [Accepted: 01/25/2016] [Indexed: 12/13/2022] Open
Abstract
It is well known that natriuretic peptides (NPs) are involved in the regulation of gastrointestinal motility. Interstitial cells of Cajal (ICC) are the pacemaker cells of gastrointestinal motility and gastrointestinal dyskinesia is one of the important digestive tract symptoms of depression. However, it is unclear whether they are involved in depression-induced loss of ICC. The aim of the present study was to investigate the relationship between the natriuretic peptide signaling pathway and depression-induced loss of gastric ICC in depressed rats. These results showed that the expression of c-kit and stem cell factor (SCF) in smooth muscle layers of stomach were down-regulated in depressed rats at the mRNA and protein levels. The expression of natriuretic peptide receptor (NPR)-A, B and C were up-regulated in the stomach of depressed rats at the mRNA and protein levels. NPR-A, B and C can significantly decrease the expression of SCF to treat cultured gastric smooth muscle cells (GSMCs) obtained from normal rats with different concentrations of C-type natriuretic peptide (CNP). Pretreatment of cultured GSMCs with 8-Brom-cGMP (8-Br-cGMP, a membrane permeable cGMP analog), cANF (a specific NPR-C agonist) and CNP (10−6 mol/L) demonstrated that 8-Br-cGMP had a similar effect as CNP, but treatment with cANF did not. The results of the methyl thiazolyl tetrazolium bromide (MTT) assay indicated that high concentrations of cANF (10−6 mol/L) restrained the proliferation of cultured GSMCs. Taken together, these results indicate that the up-regulation of the NPs/NPR-C and NPs/NPR-A, B/cGMP signaling pathways may be involved in depression-induced loss of gastric ICC.
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Affiliation(s)
- Xue-Lian Lin
- Central Laboratory, The First Affiliated Hospital of Dalian Medical University, Dalian 116011, Liaoning Province, China
| | - Xu-Dong Tang
- Department of Gastroenterology, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, 100091, China
| | - Zheng-Xu Cai
- Department of Neurology, The First Affiliated Hospital of Dalian Medical University, Dalian 116011, Liaoning Province, China
- * E-mail: (HSG); (ZXC)
| | - Feng-Yun Wang
- Department of Gastroenterology, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, 100091, China
| | - Ping Li
- Central Laboratory, The First Affiliated Hospital of Dalian Medical University, Dalian 116011, Liaoning Province, China
| | - Hua Sui
- Institute of Basic Research of Integrative Medicine, Dalian Medical University, Dalian, 116044, Liaoning Province, China
| | - Hui-Shu Guo
- Central Laboratory, The First Affiliated Hospital of Dalian Medical University, Dalian 116011, Liaoning Province, China
- * E-mail: (HSG); (ZXC)
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3
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Huang SC. C-type atriuretic peptide causes relaxation of the internal anal sphincter through natriuretic peptide receptor B. Tzu Chi Med J 2015. [DOI: 10.1016/j.tcmj.2015.05.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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4
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Dendroaspis natriuretic peptide is the most potent natriuretic peptide to cause relaxation of lower esophageal sphincter. ACTA ACUST UNITED AC 2011; 167:246-9. [DOI: 10.1016/j.regpep.2011.02.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2010] [Revised: 01/31/2011] [Accepted: 02/08/2011] [Indexed: 01/16/2023]
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5
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Tota B, Cerra MC, Gattuso A. Catecholamines, cardiac natriuretic peptides and chromogranin A: evolution and physiopathology of a 'whip-brake' system of the endocrine heart. ACTA ACUST UNITED AC 2010; 213:3081-103. [PMID: 20802109 DOI: 10.1242/jeb.027391] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
In the past 50 years, extensive evidence has shown the ability of vertebrate cardiac non-neuronal cells to synthesize and release catecholamines (CA). This formed the mindset behind the search for the intrinsic endocrine heart properties, culminating in 1981 with the discovery of the natriuretic peptides (NP). CA and NP, co-existing in the endocrine secretion granules and acting as major cardiovascular regulators in health and disease, have become of great biomedical relevance for their potent diagnostic and therapeutic use. The concept of the endocrine heart was later enriched by the identification of a growing number of cardiac hormonal substances involved in organ modulation under normal and stress-induced conditions. Recently, chromogranin A (CgA), a major constituent of the secretory granules, and its derived cardio-suppressive and antiadrenergic peptides, vasostatin-1 and catestatin, were shown as new players in this framework, functioning as cardiac counter-regulators in 'zero steady-state error' homeostasis, particularly under intense excitatory stimuli, e.g. CA-induced myocardial stress. Here, we present evidence for the hypothesis that is gaining support, particularly among human cardiologists. The actions of CA, NP and CgA, we argue, may be viewed as a hallmark of the cardiac capacity to organize 'whip-brake' connection-integration processes in spatio-temporal networks. The involvement of the nitric oxide synthase (NOS)/nitric oxide (NO) system in this configuration is discussed. The use of fish and amphibian paradigms will illustrate the ways that incipient endocrine-humoral agents have evolved as components of cardiac molecular loops and important intermediates during evolutionary transitions, or in a distinct phylogenetic lineage, or under stress challenges. This may help to grasp the old evolutionary roots of these intracardiac endocrine/paracrine networks and how they have evolved from relatively less complicated designs. The latter can also be used as an intellectual tool to disentangle the experimental complexity of the mammalian and human endocrine hearts, suggesting future investigational avenues.
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Affiliation(s)
- Bruno Tota
- Department of Cell Biology, University of Calabria, 87030, Arcavacata di Rende, Italy.
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6
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Zhang SY, Cai ZX, Li P, Cai CY, Qu CL, Guo HS. Effect of dendroaspis natriuretic peptide (DNP) on L-type calcium channel current and its pathway. ACTA ACUST UNITED AC 2010; 164:120-5. [PMID: 20594955 DOI: 10.1016/j.regpep.2010.05.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2010] [Revised: 05/05/2010] [Accepted: 05/30/2010] [Indexed: 10/19/2022]
Abstract
Dendroaspis natriuretic peptide (DNP), a newly-described natriuretic peptide, relaxes gastrointestinal smooth muscle. L-type calcium channel currents play an important role in regulating smooth muscle contraction. The effect of DNP on L-type calcium channel currents in gastrointestinal tract is still unclear. This study was designed to investigate the effect of DNP on barium current (I(Ba)) through the L-type calcium channel in gastric antral myocytes of guinea pigs and cGMP-pathway mechanism. The whole-cell patch-clamp technique was used to record L-type calcium channel currents. The content of cGMP in guinea pig gastric antral smooth muscle and perfusion solution was measured using radioimmunoassay. DNP markedly enhanced cGMP levels in gastric antral smooth muscle tissue and in perfusion medium. DNP concentration-dependently inhibited I(Ba) in freshly isolated guinea pig gastric antral circular smooth muscle cells (SMCs) of guinea pigs. DNP-induced inhibition of I(Ba) was partially blocked by LY83583, an inhibitor of guanylate cyclase. KT5823, a cGMP-dependent protein kinase (PKG) inhibitor, almost completely blocked DNP-induced inhibition of I(Ba). However, DNP-induced inhibition of I(Ba) was potentiated by zaprinast, an inhibitor of cGMP-sensitive phosphodiesterase. Taken together, DNP inhibits L-type calcium channel currents via pGC-cGMP-PKG-dependent signal pathway in gastric antral myocytes of guinea pigs.
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Affiliation(s)
- Shu-Ying Zhang
- Department of Internal Medicine, Affiliated Zhongshan Hospital of Dalian University, Dalian 116001, China.
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7
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Wen QP, Cai CY, Li P, Cai ZX, Cheng L, Qi QH, Guo HS. Role of potassium channels in Dendroaspis natriuretic peptide-induced inhibition of gastric motility. Shijie Huaren Xiaohua Zazhi 2010; 18:217-221. [DOI: 10.11569/wcjd.v18.i3.217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the role of potassium channels in Dendroaspis natriuretic peptide (DNP)-induced relaxation of gastric antral circular smooth muscle of guinea pigs.
METHODS: The spontaneous contraction of gastric antral circular muscle of guinea pigs was recorded using a four-channel physiograph. The contents of cyclic guanosine monophosphate (cGMP) in gastric antral smooth muscle tissue and in perfusion medium were measured by radioimmunoassay. The whole cell patch-clamp technique was used to record calcium-activated potassium current (IK(Ca)) and delayed rectifier potassium current (IK(V)) in gastric myocytes isolated by collagenase digestion.
RESULTS: DNP inhibited the spontaneous contraction of gastric antral circular smooth muscle in a dose-dependent manner. DNP at concentrations of 1, 10, 100 and 1 000 nmol/L reduced the amplitude of the spontaneous contraction by 35% ± 6%, 54% ± 6%, 78% ± 13% and 94% ± 6%, respectively. LY83583, an inhibitor of soluble guanylate cyclase, significantly blocked DNP-induced relaxation of gastric antral circular smooth muscle (reduced amplitude: 42% ± 6% vs 60% ± 4%, P < 0.05). In contrast, zaprinast, a cGMP-sensitive phosphodiesterase inhibitor, potentiated DNP-induced relaxation of gastric antral circular smooth muscle (reduced amplitude: 72% ± 7% vs 58% ± 5%, P < 0.05). DNP markedly enhanced cGMP levels in gastric antral smooth muscle tissue and in perfusion medium. DNP increased the amplitude of IK(Ca) at 60 mV by 62.31% ± 3.22%, but decreased the amplitude of IK(V) at 60 mV by 18% ± 2.3% in gastric antral circular myocytes of guinea pigs.
CONCLUSION: DNP relaxes the gastric antral circular smooth muscle of guinea pigs by increasing IK(Ca) in a cGMP-dependent pathway. IK(V) may play a critical role in regulating resting membrane potential in gastric antral circular myocytes of guinea pigs.
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8
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Gu XY, Cai ZX, Yuan H, Wu TH, Li J, Guo HS. Effects of Dendroaspis natriuretic peptide on delayed rectifier potassium currents and its mechanism. ACTA ACUST UNITED AC 2009; 155:115-20. [PMID: 19245821 DOI: 10.1016/j.regpep.2009.02.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2008] [Revised: 12/10/2008] [Accepted: 02/03/2009] [Indexed: 11/25/2022]
Abstract
Dendroaspis natriuretic peptide (DNP), a newly-described natriuretic peptide, plays an inhibitory role in smooth muscle motility of the gastrointestinal tract. However, the effect of DNP on delayed rectifier potassium currents I(K(V)) is still unclear. In this study, we sought to investigate the effect of DNP on I(K(V)) and its mechanism in gastric antral circular smooth muscle cells using the whole-cell patch-clamp technique. DNP significantly inhibited I(K(V)) in a concentration-dependent manner. LY83583 (1 micromol/l), a guanylate cyclase inhibitor, significantly impaired DNP-induced inhibition of I(K(V)). Moreover, DNP-induced inhibition in I(K(V)) was potentiated by the cyclic guanosine monophosphate (cGMP) sensitive phosphoesterase inhibitor zaparinast (0.1 micromol/l). DNP-induced inhibition of I(K(V)) was completely blocked by KT5823, an inhibitor of cGMP-dependent protein kinase G(PKG), but not affected by KT-5720, a PKA-specific inhibitor. Taken together, our results suggest that DNP inhibits I(K(V)) via the cGMP/PKG-dependent signaling axis instead of the cAMP/PKA pathway.
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Affiliation(s)
- Xin-Yi Gu
- Department of internal medicine, Affiliated Zhongshan Hospital of Dalian University, Dalian 116001, China
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9
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Cai CY, Cai ZX, Gu XY, Shan LJ, Wang YX, Yin XZ, Qi QH, Guo HS. Dendroaspis natriuretic peptide relaxes gastric antral circular smooth muscle of guinea-pig through the cGMP/cGMP-dependent protein kinase pathway. World J Gastroenterol 2008; 14:5461-6. [PMID: 18803360 PMCID: PMC2744167 DOI: 10.3748/wjg.14.5461] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To systematically investigate if cGMP/cGMP-dependent protein kinase G (PKG) signaling pathway may participate in dendroaspis natriuretic peptide (DNP)-induced relaxation of gastric circular smooth muscle.
METHODS: The content of cGMP in guinea pig gastric antral smooth muscle tissue and perfusion solution were measured using radioimmunoassay; spontaneous contraction of gastric antral circular muscles recorded using a 4-channel physiograph; and Ca2+-activated K+ currents (IK(Ca)) and spontaneous transient outward currents (STOCs) in isolated gastric antral myocytes were recorded using the whole-cell patch clamp technique.
RESULTS: DNP markedly enhanced cGMP levels in gastric antral smooth muscle tissue and in the perfusion medium. DNP induced relaxation in gastric antral circular smooth muscle, which was inhibited by KT5823, a cGMP-dependent PKG inhibitor. DNP increased IK(Ca). This effect was almost completely blocked by KT5823, and partially blocked by LY83583, an inhibitor of guanylate cyclase to change the production of cGMP. DNP also increased STOCs. The effect of DNP on STOCs was abolished in the presence of KT5823, but not affected by KT-5720, a PKA-specific inhibitor.
CONCLUSION: DNP activates IK(Ca) and relaxes guinea-pig gastric antral circular smooth muscle via the cGMP/PKG-dependent singling axis instead of cAMP/PKA pathway.
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10
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Natriuretic peptides cause relaxation of human esophageal mucosal muscle. ACTA ACUST UNITED AC 2008; 146:224-9. [DOI: 10.1016/j.regpep.2007.09.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2006] [Revised: 08/13/2007] [Accepted: 09/11/2007] [Indexed: 01/16/2023]
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11
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Cao LH, Yang XL. Natriuretic peptides and their receptors in the central nervous system. Prog Neurobiol 2007; 84:234-48. [PMID: 18215455 DOI: 10.1016/j.pneurobio.2007.12.003] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2007] [Revised: 11/05/2007] [Accepted: 12/10/2007] [Indexed: 10/22/2022]
Abstract
Natriuretic peptides (NPs), including atrial, brain and C-type NPs, are a family of structurally related but genetically distinct peptides. These peptides, along with their receptors (NPRs), are long known to be involved in the regulation of various physiological functions, such as diuresis, natriuresis, and blood flow. Recently, abundant evidence shows that NPs and NPRs are widely distributed in the central nervous system (CNS), suggesting possible roles of NPs in modulating physiological functions of the CNS. This review starts with a brief summary of relevant background information, such as molecular structures of NPs and NPRs and general intracellular mechanisms after activation of NPRs. We then provide a detailed description of the expression profiles of NPs and NPRs in the CNS and an in-depth discussion of how NPs are involved in neural development, neurotransmitter release, synaptic transmission and neuroprotection through activation of NPRs.
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Affiliation(s)
- Li-Hui Cao
- Institute of Neurobiology, Institutes of Brain Science and State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai, China
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12
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Guo HS, Yang YZ, Zou Y, Xu J, Cai ZX, Qi QH. Effects of dendroaspis natriuretic peptide on calcium-activated potassium current and its mechanism. J Physiol Sci 2007; 58:1-6. [PMID: 18096107 DOI: 10.2170/physiolsci.rp010507] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2007] [Accepted: 12/20/2007] [Indexed: 11/05/2022]
Abstract
In this study, we sought to investigate the effect of dendroaspis natriuretic peptide (DNP) on calcium-activated potassium current (I K(Ca)) and its mechanism in gastric antral circular smooth muscle cells (SMCs) using the whole-cell patch-clamp technique. DNP concentration-dependently increased macroscopic I K(Ca) and spontaneous transient outward currents (STOCs) in freshly isolated guinea pig gastric antral circular SMCs. The effects of DNP on I K(Ca) and/or STOCs were not blocked by applying calcium-free bath solution or the ryanodine receptor (RyR) antagonist ryanodine (10 microM), but they were inhibited by the inositol triphosphate receptor (IP3R) inhibitor heparin or the guanylate cyclase inhibitor LY83583. Moreover, a DNP-induced increase in STOCs was potentiated by the cyclic guanosine monophosphate (cGMP)-sensitive phosphoesterase inhibitor zaprinast. In conclusion, our results suggest that DNP increases I K(Ca) in gastric antral circular SMCs by increasing cGMP production and activating IP3Rs.
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Affiliation(s)
- Hui-Shu Guo
- Central Laboratory, First Affiliated Hospital of Dalian Medical Universty, Dalian, China.
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13
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Guo HS, Cai ZX, Wu TH, Xu J, Qiu Y, Xu WX. Inhibitory effect of dendroaspis natriuretic peptide on spontaneous contraction in gastric antral circular smooth muscles of guinea pigs. Acta Pharmacol Sin 2007; 28:1797-802. [PMID: 17959031 DOI: 10.1111/j.1745-7254.2007.00703.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
AIM To determine whether the natriuretic peptide receptor (NPR) is present in the stomach of guinea pigs and to investigate the effect of dendroaspis natriuretic peptide (DNP) on the gastric motility of guinea pigs and its mechanism. METHODS The distribution of the NPR was analyzed by autoradioimmunography. The spontaneous contraction of gastric antral circular muscles of guinea pigs was recorded by a 4-channel physiograph. The whole cell patch-clamp technique was introduced to record calcium-activated potassium currents in the gastric myocytes isolated by collagenase. RESULTS The NPR existed in the gastric fundus, gastric body, and gastric antrum of guinea pigs, and its density was largest in the gastric antrum. DNP inhibited spontaneous contraction and exhibited a dose-dependent manner. The DNP-induced inhibition was diminished by LY83583 (a guanylate cyclase inhibitor) and was potentiated by zaprinast (a cGMP-sensitive phosphoesterase inhibitor). The inhibitory effect of DNP on spontaneous contraction was also inhibited by tetraethylammonium (a non-selective potassium channel blocker); 10 nmol/L DNP increased the calcium-activated potassium currents in the gastric circular myocytes of guinea pigs. CONCLUSION The NPR is most common in the gastric antrum of guinea pigs. DNP significantly inhibits gastric motility in the gastric antrum of guinea pigs. The inhibitory effect occurs via a cGMP-dependent pathway, and a calcium-activated potassium channel may be also involved in the relaxation induced by DNP in gastric antral circular smooth muscles.
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Affiliation(s)
- Hui-shu Guo
- Centralab and Department of Neurology, The First Affiliated Hospital of Dalian Medical University, Dalian 116011, China.
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14
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Singh G, Maguire JJ, Kuc RE, Skepper JN, Fidock M, Davenport AP. Characterization of the snake venom ligand [125I]-DNP binding to natriuretic peptide receptor-A in human artery and potent DNP mediated vasodilatation. Br J Pharmacol 2006; 149:838-44. [PMID: 17043672 PMCID: PMC2014690 DOI: 10.1038/sj.bjp.0706924] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND AND PURPOSE The natriuretic peptides, ANP and BNP, modulate vascular smooth muscle tone in human conduit arteries. Surprisingly, the natriuretic peptide receptor-A (NPR-A) has not been visualized using radioligand binding in these vessels. A new member of this peptide family, Dendroaspis natriuretic peptide (DNP) identified from snake venom, has been proposed to be present in human plasma and endothelial cells. Also, recently a novel radioligand, [(125)I]-DNP, has been characterized as selective for NPR-A in human heart. EXPERIMENTAL APPROACH Our aims were to investigate expression and function of NPR-A receptors in human mammary artery using [(125)I]-DNP to quantify receptor density, immunocytochemistry to delineate the cellular distribution of the receptor and in vitro pharmacology to compare DNP induced vasodilatation to that of ANP. KEY RESULTS Saturable, sub-nanomolar affinity [(125)I]-DNP binding was detected to smooth muscle of mammary artery, with receptor density of approximately 2 fmol mg(-1) protein, comparable to that of other vasoactive peptides. NPR-A immunoreactivity was localised to vascular smooth muscle cells and this was confirmed with fluorescence dual labelling. NPR-A expression was not detected in the endothelium. Like ANP, DNP fully reversed the constrictor response to ET-1 in endothelium intact or denuded mammary artery, with comparable nanomolar potencies. CONCLUSIONS AND IMPLICATIONS This is the first characterization of NPR-A in human mammary artery using [(125)I]-DNP and we provide evidence for the presence of receptor protein on vascular smooth muscle cells, but not endothelial cells. This implies that the observed vasodilatation is predominantly mediated via direct activation of smooth muscle NPR-A.
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MESH Headings
- Adrenomedullin/pharmacology
- Amino Acid Sequence
- Atrial Natriuretic Factor/pharmacology
- Calcitonin Gene-Related Peptide/pharmacology
- Dose-Response Relationship, Drug
- Elapid Venoms/metabolism
- Elapid Venoms/pharmacology
- Fluorescent Antibody Technique, Indirect
- Guanylate Cyclase/analysis
- Guanylate Cyclase/drug effects
- Guanylate Cyclase/metabolism
- Humans
- Immunohistochemistry
- In Vitro Techniques
- Intercellular Signaling Peptides and Proteins
- Ligands
- Mammary Arteries/chemistry
- Mammary Arteries/drug effects
- Mammary Arteries/metabolism
- Microscopy, Confocal
- Models, Biological
- Molecular Sequence Data
- Muscle, Smooth, Vascular/chemistry
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Peptides/metabolism
- Peptides/pharmacology
- Protein Binding
- Radiopharmaceuticals/metabolism
- Receptors, Atrial Natriuretic Factor/analysis
- Receptors, Atrial Natriuretic Factor/drug effects
- Receptors, Atrial Natriuretic Factor/metabolism
- Vasodilation/drug effects
- Vasodilator Agents/metabolism
- Vasodilator Agents/pharmacology
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Affiliation(s)
- G Singh
- Clinical Pharmacology Unit, University of Cambridge, Centre for Clinical Investigation, Addenbrooke's Hospital Cambridge, UK
| | - J J Maguire
- Clinical Pharmacology Unit, University of Cambridge, Centre for Clinical Investigation, Addenbrooke's Hospital Cambridge, UK
- Author for correspondence:
| | - R E Kuc
- Clinical Pharmacology Unit, University of Cambridge, Centre for Clinical Investigation, Addenbrooke's Hospital Cambridge, UK
| | - J N Skepper
- Department of Anatomy, Multi-Imaging Centre, University of Cambridge Cambridge, UK
| | - M Fidock
- Pfizer Global Research & Development Sandwich, Kent, UK
| | - A P Davenport
- Clinical Pharmacology Unit, University of Cambridge, Centre for Clinical Investigation, Addenbrooke's Hospital Cambridge, UK
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15
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Lee MC, Hu HC, Huang SC. Natriuretic peptides cause relaxation of human and guinea-pig gallbladder muscle through interaction with natriuretic peptide receptor-B. ACTA ACUST UNITED AC 2005; 129:31-6. [PMID: 15927695 DOI: 10.1016/j.regpep.2005.01.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2004] [Accepted: 01/07/2005] [Indexed: 01/16/2023]
Abstract
Atrial natriuretic peptide (ANP) binding sites have been demonstrated in the guinea-pig gallbladder muscle with unclear function. To investigate effects of natriuretic peptides in the gallbladder, we measured relaxation of isolated human and guinea-pig gallbladder strips caused by natriuretic peptides, including C-type natriuretic peptide (CNP), brain natriuretic peptide (BNP) and ANP, as well as des[Gln18, Ser19, Gly20, Leu21, Gly22]ANP(4-23) amide (cANP(4-23)), a selective natriuretic peptide receptor-C (NPR-C) agonist. Results in the human gallbladder were similar to those in the guinea-pig gallbladder. CNP, BNP, ANP and cANP(4-23) alone did not cause contraction or relaxation in resting gallbladder strips. However, in carbachol or endothelin-1-contracted strips, CNP caused moderate, sustained and concentration-dependent relaxation. The relaxation was not affected by tetrodotoxin or atropine in endothelin-1-contracted gallbladder strips and not by tetrodotoxin in carbachol-contracted strips. These indicate a direct effect of CNP on the gallbladder muscle. The relative potencies for natriuretic peptides to cause relaxation were CNP>>BNP> or = ANP. cANP(4-23) did not cause relaxation. These indicate the existence of the natriuretic peptide receptor-B (NPR-B) mediating the relaxation. Taken together, these results demonstrate that natriuretic peptides cause relaxation of human and guinea-pig gallbladder muscle through interaction with the natriuretic peptide receptor-B.
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Affiliation(s)
- Ming-Che Lee
- Department of Surgery and Graduate Institute of Medicine, Taiwan
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