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Cao S, Han C, Xuan C, Li X, Wen J, Xu D. Effects of cGMP/Akt/GSK-3β signaling pathway on atrial natriuretic peptide secretion in rabbits with rapid atrial pacing. Front Physiol 2022; 13:861981. [PMID: 36060704 PMCID: PMC9437264 DOI: 10.3389/fphys.2022.861981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 07/18/2022] [Indexed: 11/13/2022] Open
Abstract
Atrial natriuretic peptide (ANP) plays a pivotal role in the regulation of the cardiovascular system. The ANP level increases during atrial fibrillation (AF), suggesting that AF may provoke ANP secretion, but its potential mechanism is still unclear. In the present study, the potential mechanisms of rapid atrial pacing (RAP) regulating ANP secretion was explored. Rabbits were subjected to burst RAP, ANP secretion increased whereas cyclic guanosine monophosphate (cGMP) concentrations decreased during RAP. The p-Akt and p-GSK-3β levels decreased in atrial tissues. Natriuretic peptide receptor A (NPR-A) protein and particulate guanylate cyclase (PGC) activity were detected. The sensitivity of NPR-A to ANP decreased, leading to the decrease of PGC activity. Also, the isolated atrial perfusion system were made in the rabbit model, cGMP was shown to inhibit ANP secretion, and the Akt inhibitor LY294002 (LY) and GSK-3β inhibitor SB216763 (SB) attenuated the inhibitory effects of cGMP on ANP secretion and enhanced the inhibitory effects of cGMP on atrial dynamics. In conclusion, NPR-A interacts with ANP to regulate PGC expression, and influence the expression of cGMP during RAP, which involves in the Akt/GSK-3β signaling pathway. From the aforementioned points we conclude that cGMP regulates ANP secretion by the Akt/GSK-3β signaling pathway during atrial pacing.
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Affiliation(s)
- Shuxia Cao
- Center of Morphological Experiment, Medical College of Yanbian University, Jilin, China
| | - Chengyong Han
- Center of Morphological Experiment, Medical College of Yanbian University, Jilin, China
| | - Chunhua Xuan
- Department of Cardiology, Affiliated Hospital of Yanbian University, Jilin, China
| | - Xiangdan Li
- Center of Morphological Experiment, Medical College of Yanbian University, Jilin, China
| | - Jing Wen
- Key Laboratory of Medical Electrophysiology, Ministry of Education and Medical Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, China
- *Correspondence: Jing Wen, ; Dongyuan Xu,
| | - Dongyuan Xu
- Center of Morphological Experiment, Medical College of Yanbian University, Jilin, China
- *Correspondence: Jing Wen, ; Dongyuan Xu,
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Lee HS, Cho KW, Kim HY, Ahn YM. Chamber-specific regulation of atrial natriuretic peptide secretion in cardiac hypertrophy: atrial wall dynamics in the ANP secretion. Pflugers Arch 2020; 472:639-651. [DOI: 10.1007/s00424-020-02377-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Revised: 04/01/2020] [Accepted: 04/02/2020] [Indexed: 12/21/2022]
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Tan R, Ahn YM, Kim HY, Lee YJ, Cho KW, Kang DG, Lee HS. Atrial secretion of ANP is suppressed in renovascular hypertension: shifting of ANP secretion from atria to the left ventricle. Am J Physiol Heart Circ Physiol 2018; 315:H590-H601. [PMID: 29979625 DOI: 10.1152/ajpheart.00612.2017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In the present study, the change in secretion of atrial natriuretic peptide (ANP) from the atria was defined in hypertension accompanied by ventricular hypertrophy and increased synthesis of ANP. To identify the change of the secretion and mechanisms involved, experiments were performed in isolated perfused beating atria from sham-operated normotensive and renovascular hypertensive rats. Expression of ANP, natriuretic peptide receptor (NPR)-C, components of the renin-angiotensin system, and muscarinic signaling pathway was measured in cardiac tissues. Basal levels of ANP secretion and acetylcholine (ACh)- and stretch-induced activation of ANP secretion were suppressed in the atria from hypertensive compared with normotensive rats. ACh increased ANP secretion via M2 muscarinic ACh receptor-ACh-sensitive K+ channel signaling. In hypertensive rats, ANP concentration increased in the left ventricle but decreased in the right ventricle. The atrial concentration of ANP was not changed in hypertensive compared with normotensive rats. ANP mRNA expression was accentuated in the left ventricle but suppressed in the other cardiac chambers in the hearts of hypertensive rats. NPR-C expression was inversely related to ANP mRNA levels. Angiotensin II type 1 receptor (AT1R) expression was accentuated in the cardiac chambers from hypertensive rats compared with normotensive rats, whereas angiotensin II type 2 receptor, M2 muscarinic receptor, and Kir3.4 channels were suppressed. AT1R blockade with losartan reversed the change observed in hypertensive rats. The present findings indicate that renovascular hypertension shifts the major site of ANP secretion and synthesis from the atria to the left ventricle through modulation of the expression of ANP, NPR-C, AT1R, and the M2 muscarinic signaling pathway. NEW & NOTEWORTHY Renovascular hypertension suppresses the atrial secretion of ANP and shifts the major site of the regulation of ANP secretion and synthesis from atria to the hypertrophied left ventricle possibly via modulation of the expression of ANP, natriuretic peptide receptor-C, angiotensin II subtype 1 receptor, and M2 muscarinic signaling pathway.
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Affiliation(s)
- Rui Tan
- Hanbang Cardio-Renal Syndrome Research Center, Department of Herbal Resources, Professional Graduate School of Oriental Medicine Wonkwang University, Iksan, Korea
| | - You Mee Ahn
- Hanbang Cardio-Renal Syndrome Research Center, Department of Herbal Resources, Professional Graduate School of Oriental Medicine Wonkwang University, Iksan, Korea
| | - Hye Yoom Kim
- Hanbang Cardio-Renal Syndrome Research Center, Department of Herbal Resources, Professional Graduate School of Oriental Medicine Wonkwang University, Iksan, Korea
| | - Yun Jung Lee
- Hanbang Cardio-Renal Syndrome Research Center, Department of Herbal Resources, Professional Graduate School of Oriental Medicine Wonkwang University, Iksan, Korea
| | - Kyung Woo Cho
- Hanbang Cardio-Renal Syndrome Research Center, Department of Herbal Resources, Professional Graduate School of Oriental Medicine Wonkwang University, Iksan, Korea
| | - Dae Gill Kang
- Hanbang Cardio-Renal Syndrome Research Center, Department of Herbal Resources, Professional Graduate School of Oriental Medicine Wonkwang University, Iksan, Korea
| | - Ho Sub Lee
- Hanbang Cardio-Renal Syndrome Research Center, Department of Herbal Resources, Professional Graduate School of Oriental Medicine Wonkwang University, Iksan, Korea
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Modification of levosimendan-induced suppression of atrial natriuretic peptide secretion in hypertrophied rat atria. Eur J Pharmacol 2018; 829:54-62. [PMID: 29653089 DOI: 10.1016/j.ejphar.2018.04.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 04/05/2018] [Accepted: 04/09/2018] [Indexed: 10/17/2022]
Abstract
This study aimed to determine the effects of levosimendan, a calcium sensitizer, on atrial contractility and atrial natriuretic peptide (ANP) secretion and its modification in hypertrophied atria. Isolated perfused beating rat atria were used from control and isoproterenol-treated rats. Levosimendan and its metabolite OR-1896 caused a positive inotropic effect and suppressed ANP secretion in rat atria. Similar to levosimendan, the selective phosphodiesterase 3 (PDE3) or PDE4 inhibitor also suppressed ANP secretion. Suppression of ANP secretion by 1 µM levosimendan was abolished by PDE3 inhibitor, but reversed by PDE4 inhibitor. Levosimendan-induced suppression of ANP secretion was potentiated by KATP channel blocker, but blocked by KATP channel opener. Levosimendan alone did not significantly change cyclic adenosine monophosphate (cAMP) efflux in the perfusate; however, levosimendan combined with PDE4 inhibitor markedly increased this efflux. The stimulation of ANP secretion induced by levosimendan combined with PDE4 inhibitor was blocked by the protein kinase A (PKA) inhibitor. In isoproterenol-treated atria, levosimendan augmented the positive inotropic effect and ANP secretion in response to an increased extracellular calcium concentration ([Ca+]o). These results suggests that levosimendan suppresses ANP secretion by both inhibiting PDE3 and opening KATP channels and that levosimendan combined with PDE4 inhibitor stimulates ANP secretion by activating the cAMP-PKA pathway. Modification of the effects of levosimendan on [Ca+]o-induced positive inotropic effects and ANP secretion in isoproterenol-treated rat atria might be related to a disturbance in calcium metabolism.
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Wu LH, Zhang Q, Zhang S, Meng LY, Wang YC, Sheng CJ. Effects of gene knockdown of CNP on ventricular remodeling after myocardial ischemia-reperfusion injury through NPRB/Cgmp signaling pathway in rats. J Cell Biochem 2017; 119:1804-1818. [PMID: 28796407 DOI: 10.1002/jcb.26341] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 08/08/2017] [Indexed: 01/27/2023]
Abstract
This study aimed to explore effects of CNP on ventricular remodeling following myocardial ischemia-reperfusion (I/R) injury through the NPRB/cGMP signaling pathway. Rat cardiomyocytes were assigned into: control, I/R, I/R + CNP, and I/R + 8-Br-cGMP groups. ELISA, qRT-PCR, and Western blotting were used to detect cGMP content and expression, respectively. After model establishment of I/R rats, normal control, CNP-/- control, I/R, and CNP-/- groups were set. Indexes of heart were detected using echocardiography and hemodynamics. ELISA was used to measure serum CNP, cGMP, LDH, cTn I, CK-MB, TNF-α, and IL-6 levels. Myocardial infarct was identified by TTC staining, and apoptosis conditions by TUNEL staining. QRT-PCR and Western blotting were adopted to detect expressions of CNP, NPRB, cGMP, and apoptosis-related genes. Compared with control group, cGMP contents and expression in the I/R, I/R + CNP and I/R + 8-Br-cGMP groups were decreased. Levels of LVEDV, LVESV, LVDS, LVDD, IVSD, LVM, LVEDP, and LVSP were higher in the I/R, CNP-/- control, and CNP-/- groups than normal control group while LVEF, SV, CO, and ±dp/dtmax were lower. Compared with the normal control group, LDH, cTn I, CK-MB, TNF-α, and IL-6 were higher in the I/R, CNP-/- control and CNP-/- groups; pathological changes and myocardial infarction were observed in the I/R, CNP-/- control, and CNP-/- groups; expressions of apoptosis-related genes in those groups were higher; while CNP, NPRB, cGMP, and Bcl-2 expressions were decreased. We came to the conclusion that gene knockdown of CNP blocks the NPRB/cGMP signaling pathway, thereby aggravating myocardial I/R injury and causing ventricular remodeling in rats.
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Affiliation(s)
- Lian-He Wu
- Department of Cardiac Surgery, Jining No.1 People's Hospital, Jining, China
| | - Qi Zhang
- Department of Cardiology, Dongying City People's Hospital, Dongying, China
| | - Shen Zhang
- Department of Cardiac Surgery, Jining No.1 People's Hospital, Jining, China
| | - Lu-Yu Meng
- Department of Cardiac Surgery, Jining No.1 People's Hospital, Jining, China
| | - Yan-Chi Wang
- Department of Cardiac Surgery, Jining No.1 People's Hospital, Jining, China
| | - Cun-Jian Sheng
- Department of Cardiac Surgery, Jining No.1 People's Hospital, Jining, China
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Park BM, Chun H, Chae SW, Kim SH. Fermented garlic extract ameliorates monocrotaline-induced pulmonary hypertension in rats. J Funct Foods 2017. [DOI: 10.1016/j.jff.2017.01.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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Hu P, Xia X, Xuan Q, Huang BY, Liu SY, Zhang DD, Jiang GM, Xu Y, Qin YH. Neutral endopeptidase and natriuretic peptide receptors participate in the regulation of C-type natriuretic peptide expression in renal interstitial fibrosis. J Recept Signal Transduct Res 2016; 37:71-83. [PMID: 27278005 DOI: 10.3109/10799893.2016.1155068] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Peng Hu
- Department of Pediatrics, the First Affiliated Hospital of Anhui Medical University, Hefei, People's Republic of China
| | - Xun Xia
- Department of Pediatrics, the First Affiliated Hospital of Anhui Medical University, Hefei, People's Republic of China
| | - Qiang Xuan
- Department of Urology, Anhui Provincial Hospital, Anhui Medical University, Hefei, People's Republic of China
| | - Bao Yu Huang
- Department of Pediatrics, the First Affiliated Hospital of Anhui Medical University, Hefei, People's Republic of China
| | - Si Yan Liu
- Department of Pediatrics, the First Affiliated Hospital of Anhui Medical University, Hefei, People's Republic of China
| | - Dong Dong Zhang
- Department of Pediatrics, the First Affiliated Hospital of Anhui Medical University, Hefei, People's Republic of China
| | - Guang Mei Jiang
- Department of Pediatrics, the First Affiliated Hospital of Anhui Medical University, Hefei, People's Republic of China
| | - Yao Xu
- Department of Pediatrics, the First Affiliated Hospital of Anhui Medical University, Hefei, People's Republic of China
| | - Yuan Han Qin
- Department of Pediatrics, First Affiliated Hospital of Guangxi Medical University, Nanning, People's Republic of China
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Park BM, Cha SA, Kim HY, Kang DK, Yuan K, Chun H, Chae SW, Kim SH. Fermented garlic extract decreases blood pressure through nitrite and sGC-cGMP-PKG pathway in spontaneously hypertensive rats. J Funct Foods 2016. [DOI: 10.1016/j.jff.2016.01.034] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
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Jin X, Zhang Y, Li X, Zhang J, Xu D. C-type natriuretic peptide ameliorates ischemia/reperfusion-induced acute kidney injury by inhibiting apoptosis and oxidative stress in rats. Life Sci 2014; 117:40-5. [PMID: 25283078 DOI: 10.1016/j.lfs.2014.09.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Revised: 08/30/2014] [Accepted: 09/20/2014] [Indexed: 10/24/2022]
Abstract
AIMS Although atrial natriuretic peptide has been shown to attenuate ischemia-reperfusion (IR)-induced kidney injury, the effect of natriuretic peptide receptor (NPR)-B activation on IR-induced acute kidney injury is not well documented. The purpose of the present study was to identify the effect of C-type natriuretic peptide (CNP), a selective activator of NPR-B, on the IR-induced acute kidney injury and its mechanisms involved. MAIN METHODS Unilaterally nephrectomized rats were insulted by IR in their remnant kidney, and they were randomly divided into three groups: sham, vehicle+IR, and CNP+IR groups. CNP (0.2μg/kg/min) was administered intravenously at the start of a 45-min renal ischemia for 2h. Rats were then killed 24h after I/R, and the blood and tissue samples were collected to assess renal function, histology, TUNEL assay, and Western blot analysis of kidney Bax and Bcl-2 expressions. KEY FINDINGS The levels of blood urea nitrogen and serum creatinine were significantly increased in rats after IR compared with vehicle-treated rats. IR elevated apoptosis, Bcl-2/Bax ratio, TUNEL positivity, oxidative stress parameters, malondialdehyde concentration, and superoxide dismutase activity. IR also induced epithelial desquamation of the proximal tubules and glomerular shrinkage. CNP significantly attenuated the IR-induced increase in BUN and serum creatinine. Furthermore, CNP restored the suppressed renal cyclic guanosine 3' 5'-monophosphate levels caused by IR insult. SIGNIFICANCE Study findings suggest that CNP could ameliorate IR-induced acute kidney injury through inhibition of apoptotic and oxidative stress pathways, possibly through NPR-B-cGMP signaling.
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Affiliation(s)
- Xiunan Jin
- Department of Urology, Affiliated Hospital of Yanbian University, Yanji (133000), Jilin Province, China
| | - Youchen Zhang
- Department of Anatomy, Medical College of Yanbian University, Yanji (133000), Jilin Province, China
| | - Xiangdan Li
- Department of Anatomy, Medical College of Yanbian University, Yanji (133000), Jilin Province, China
| | - Jun Zhang
- Department of Anatomy, Medical College of Yanbian University, Yanji (133000), Jilin Province, China
| | - Dongyuan Xu
- Department of Anatomy, Medical College of Yanbian University, Yanji (133000), Jilin Province, China.
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Ma LX, Cui BR, Wu Y, Liu JC, Cui X, Liu LP, Piao HR. Synthesis and positive inotropic evaluation of [1,2,4]triazolo[3,4-a]phthalazine and tetrazolo[5,1-a]phthalazine derivatives bearing substituted piperazine moieties. Bioorg Med Chem Lett 2014; 24:1737-41. [DOI: 10.1016/j.bmcl.2014.02.040] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 02/02/2014] [Accepted: 02/14/2014] [Indexed: 10/25/2022]
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Hu P, Zhao XQ, Wang J, Kong HB, Hu B, Lu L, Qin YH. Paradoxical expressions of natriuretic peptide receptor-C and neutral endopeptidase account for C-type natriuretic peptide decline during the progression of experimental obstructive nephropathy. J Renin Angiotensin Aldosterone Syst 2013; 15:458-65. [PMID: 24189506 DOI: 10.1177/1470320313507121] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Affiliation(s)
- Peng Hu
- Department of Pediatrics, The First Affiliated Hospital of Anhui Medical University, China
| | - Xue Qi Zhao
- Department of Pediatrics, The First Affiliated Hospital of Anhui Medical University, China
| | - Jing Wang
- Department of Pediatrics, The First Affiliated Hospital of Anhui Medical University, China
| | - Hai Bo Kong
- Department of Pediatrics, The First Affiliated Hospital of Anhui Medical University, China
| | - Bo Hu
- Department of Pediatrics, The First Affiliated Hospital of Anhui Medical University, China
| | - Ling Lu
- Department of Pediatrics, The First Affiliated Hospital of Anhui Medical University, China
| | - Yuan Han Qin
- Department of Pediatrics, The First Affiliated Hospital of Guangxi Medical University, China
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Ethanol Extract of Lepidium apetalum Seed Elicits Contractile Response and Attenuates Atrial Natriuretic Peptide Secretion in Beating Rabbit Atria. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2013; 2013:404713. [PMID: 24288558 PMCID: PMC3830812 DOI: 10.1155/2013/404713] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Accepted: 09/09/2013] [Indexed: 11/24/2022]
Abstract
The seeds of Lepidium apetalum Willdenow (called “Tinglizi” in China and “Jungryukza” in Korea) have been used to discharge phlegm and improve dropsy in Oriental medicine. The present study investigated the effects of ethanol extract of the seeds of Lepidium apetalum (ELA) on atrial dynamics and atrial natriuretic peptide (ANP) secretion in beating rabbit atria. ELA increased atrial stroke volume, pulse pressure, and cAMP efflux, concomitantly attenuating ANP secretion in a dose-dependent manner. ELA-induced increases in atrial stroke volume, pulse pressure, and cAMP levels and decrease in ANP secretion were not inhibited by pretreatment with staurosporine, a nonspecific protein kinase inhibitor, or diltiazem and verapamil, the L-type Ca2+ channel blockers, respectively. Helveticoside, a well-known digitalis-like cardiac glycosidic constituent of ELA, also increased atrial dynamics, including stroke volume and pulse pressure, without changing cAMP efflux and ANP secretion, and the effects of helveticoside were not inhibited by pretreatment with staurosporine, diltiazem, and verapamil. These results suggest that the ELA-induced positive inotropic activity in beating rabbit atria might, at least partly, be due to the digitalis-like activity of helveticoside rather than an increase in cAMP efflux.
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Hong L, Gong GH, Yu L, Song MX, Cui X, Quan ZS. Synthesis and negative inotropic effects evaluation of 7-substituted-4,5-dihydro-[1,2,4]oxadiazolo[4,3-a]quinolin-1-ones. Arch Pharm Res 2013; 36:1338-44. [DOI: 10.1007/s12272-013-0203-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2011] [Accepted: 06/28/2013] [Indexed: 11/28/2022]
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Wu Y, Sun LP, Ma LX, Che J, Song MX, Cui X, Piao HR. Synthesis and Biological Evaluation of [1,2,4]Triazolo[3,4-a]phthalazine and Tetrazolo[5,1-a]phthalazine Derivatives Bearing Substituted Benzylpiperazine Moieties as Positive Inotropic Agents. Chem Biol Drug Des 2013; 81:591-9. [DOI: 10.1111/cbdd.12101] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Accepted: 11/10/2012] [Indexed: 11/28/2022]
Affiliation(s)
- Yan Wu
- Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules; Ministry of Education; Yanbian University College of Pharmacy; Yanji; 133000; China
| | - Liang-Peng Sun
- Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules; Ministry of Education; Yanbian University College of Pharmacy; Yanji; 133000; China
| | - Long-Xu Ma
- Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules; Ministry of Education; Yanbian University College of Pharmacy; Yanji; 133000; China
| | - Jian Che
- Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules; Ministry of Education; Yanbian University College of Pharmacy; Yanji; 133000; China
| | - Ming-Xia Song
- Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules; Ministry of Education; Yanbian University College of Pharmacy; Yanji; 133000; China
| | - Xun Cui
- Yanbian University College of Medicine; Yanji; 133000; China
| | - Hu-Ri Piao
- Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules; Ministry of Education; Yanbian University College of Pharmacy; Yanji; 133000; China
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Wu Y, Ma LX, Sun LP, Song MX, Cui X, Piao HR. Synthesis of new triazole acetamides with inotropic effects. Bioorg Med Chem Lett 2013; 23:757-60. [DOI: 10.1016/j.bmcl.2012.11.078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Revised: 11/17/2012] [Accepted: 11/20/2012] [Indexed: 10/27/2022]
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Wu Y, Ma LX, Niu TW, Meng FL, Cui X, Piao HR. Synthesis and Positive Inotropic Evaluation of (E)-2-(4-Cinnamylpiperazin-1-yl)-N-(1-substituted-4,5-dihydro-[1,2,4]triazolo[4,3-a]quinolin-7-yl)acetamides. Arch Pharm (Weinheim) 2012; 345:980-8. [DOI: 10.1002/ardp.201200159] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2012] [Revised: 08/16/2012] [Accepted: 08/17/2012] [Indexed: 11/06/2022]
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17
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Wu Y, Ma LX, Niu TW, Cui X, Piao HR. Synthesis and positive inotropic evaluation of N-(1-oxo-1,2,4,5-tetrahydro-[1,2,4]triazolo[4,3-a]quinolin-7-yl)acetamides bearing piperazine and 1,4-diazepane moieties. Bioorg Med Chem Lett 2012; 22:4229-32. [DOI: 10.1016/j.bmcl.2012.05.049] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Revised: 04/19/2012] [Accepted: 05/11/2012] [Indexed: 11/26/2022]
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Kim SM, Kim YA, Kim SY, Kim SH, Cho KW, Kim SZ. Presence of dendroaspis natriuretic peptide and its binding to NPR-A receptor in rabbit kidney. ACTA ACUST UNITED AC 2010; 167:42-9. [PMID: 21130122 DOI: 10.1016/j.regpep.2010.11.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2010] [Revised: 11/10/2010] [Accepted: 11/25/2010] [Indexed: 11/26/2022]
Abstract
Natriuretic peptides help to maintain sodium and fluid volume homeostasis in a healthy cardio-renal environment. Since the identification of Dendroaspis natriuretic peptide (DNP) as a new member of the natriuretic peptide family, DNP has been considered as an important regulator of natriuresis and dieresis. The present study was undertaken to investigate the presence of immunoreactive Dendroaspis natriuretic peptide (DNP) and its specific receptor in rabbit. DNP was detected in heart, kidney, liver, brain, and plasma by radioimmunoassay (RIA). DNP contents of cardiac atrium and ventricle, renal cortex and medulla, liver, and brain were 1.42 ± 0.15, 1.0 6 ± 0.08, 2.55 ± 0.21, 1.81 ± 0.16, 1.36 ± 0.22, and 0.69 ± 0.15 pg/mg of wet weight, respectively. The concentration of DNP in plasma was 235.44 ± 15.44 pg/ml. By quantitative in vitro receptor autoradiography, specific ¹²⁵I-DNP binding sites were revealed in glomeruli, interlobular artery, acuate artery, vasa recta bundle, and inner medulla of the kidney with an apparent dissociation constant (K(d)) of 0.29 ± 0.05, 0.36 ± 0.03, 0.84 ± 0.19, 1.18 ± 0.23, and 10.91 ± 1.59 nM, respectively. Basal rate of 3', 5'-cyclic guanosine monophosphate (cGMP) production by particulate guanylyl cyclase (GC) activation of glomerular membranes was basally 13.40 ± 1.70 pmol/mg protein/min. DNP caused an increment of cGMP production in similar magnitude to that caused by ANP, BNP, and urodilatin, while the production of cGMP by CNP was significantly lower than that by DNP. Our results show that plasma levels of DNP were higher when compared to other tissues. DNP produces cGMP via the NPR-A receptor subtype in the kidney, similarly to ANP and BNP, suggesting that plasma DNP could have similar functions as ANP and BNP.
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Affiliation(s)
- Soo Mi Kim
- Department of Physiology, Institute for Medical Sciences, Center for Healthcare Technology Development, Chonbuk National University Medical School, Jeonju 561-180, Republic of Korea
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Ye BJ, Liu XK, Jiang SM, Cui X, Piao HR. Synthesis of 2-(4-substitutedbenzyl-[1,4]diazepan-1-yl)-n-(1-methyl-4,5-dihydro-[1,2,4]triazolo[4,3-a]quinolin-7-yl)acetamides as inotropic agents. Chem Biol Drug Des 2010; 77:98-103. [PMID: 21114630 DOI: 10.1111/j.1747-0285.2010.01057.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In an attempt to search for more potent positive inotropic agents, a series of N-(4,5-dihydro-1-methyl-[1,2,4]triazolo[4,3-a]quinolin-7-yl)-2-(substitutedbenzyl-[1,4]diazepan-1-yl)acetamides were synthesized and evaluated for positive inotropic activity by measuring left atrium stroke volume in isolated rabbit heart preparations. Some of these derivatives exhibited favorable activity compared with the standard drug, milrinone, among which 2-(4-(4-methylbenzyl)-[1,4]-diazepan-1-yl)-N-(4,5-dihydro-1-methyl-[1,2,4]triazolo[4,3-a]quinolin-7-yl)acetamide (6m) was the most potent, increasing stroke volume by 8.38±0.16% (milrinone 2.45± 0.06%) at 3 x 10(-5) m. The chronotropic effects of those compounds having inotropic effects were also evaluated in this work.
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Affiliation(s)
- Bai-Jun Ye
- Key Laboratory of Natural Resources of Changbai Mountains & Functional Molecules, Ministry of Education, Yanbian University College of Pharmacy, Yanji, China
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20
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Jiang SM, Ye BJ, Liu XK, Zhang TY, Cui X, Piao HR. Synthesis and in-vitro inotropic evaluation of 2-(4-substitutedbenzyl-1,4-diazepan-1-yl)-N-(4,5-dihydro-1-phenyl-[1,2,4]triazolo[4,3-a]quinolin-7-yl)acetamides. Arch Pharm (Weinheim) 2010; 343:700-5. [PMID: 21110340 DOI: 10.1002/ardp.201000032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We describe the synthesis and positive inotropic evaluation of a series of 2-(4-substitutedbenzyl-1,4-diazepan-1-yl)-N-(4,5-dihydro-1-phenyl-[1,2,4]triazolo[4,3-a]quinolin-7-yl)acetamides by measuring left atrial stroke volume in preparations of isolated rabbit-heart. Several compounds were developed from, and showed favorable activities compared with the standard drug milrinone. Compound 5o was the most potent with an increased stroke volume of 9.17 ± 0.14% (milrinone 2.47 ± 0.08%) at 3 × 10⁻⁵ M in our in-vitro study. The chronotropic effects of those compounds having inotropic effects were also evaluated.
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21
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Shah A, Oh YB, Shan G, Song CH, Park BH, Kim SH. Angiotensin-(1-7) attenuates hyposmolarity-induced ANP secretion via the Na+-K+ pump. Peptides 2010; 31:1779-85. [PMID: 20600428 DOI: 10.1016/j.peptides.2010.06.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2010] [Revised: 06/17/2010] [Accepted: 06/17/2010] [Indexed: 11/25/2022]
Abstract
The alteration in osmolarity challenges cell volume regulation, a vital element for cell survival. Hyposmolarity causes an increase in cell volume. Recently, it has been reported that the renin-angiotensin system (RAS) plays a role in cell volume regulation. We investigated the effect of angiotensin-(1-7) [Ang-(1-7)] on hyposmolarity-induced atrial natriuretic peptide (ANP) secretion in normal and diabetic (DM) rat atria and modulation of the effect of Ang-(1-7) by the Na(+)-K(+) pump. Using isolated control rat atria, we observed that perfusion of hyposmotic solution into the atria increased ANP secretion. When Ang-(1-7) [0.1 microM or 1 microM] was perfused in a hyposmolar solution, it decreased the hyposmolarity-induced ANP secretion in a dose-dependent manner. This effect of Ang-(1-7) could be mediated by the Na(+)-K(+) pump, since ouabain, an Na(+)-K(+) pump inhibitor, significantly decreased the effect of Ang-(1-7) on hyposmolarity-induced ANP secretion. In contrast, N(omega) Nitro-l-arginine methyl ester hydrochloride (l-NAME) did not modify the effect of Ang-(1-7) on the hyposmolarity-induced ANP secretion. Interestingly, the ANP secretion was increased robustly by the perfusion of the hyposmolar solution in the DM atria, as compared to the control atria. However, the inhibitory effect of Ang-(1-7) on the hyposmolarity-induced ANP secretion was not observed in the DM atria. In the DM atria, atrial contractility was significantly increased. Taken together, we concluded that Ang-(1-7) attenuated hyposmolarity-induced ANP secretion via the Na(+)-K(+) pump and a lack of Ang-(1-7) response in DM atria may partly relate to change in Na(+)-K(+) pump activity.
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Affiliation(s)
- Amin Shah
- Department of Physiology, Diabetic Research Center, Chonbuk National University Medical School, Jeonju, South Korea
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22
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Yang K, Sun LP, Liu JY, Cui X, Piao HR. Synthesis of 2-(4-substituted benzyl-1,4-diazepan-1-yl)-N-(3,4-dihydro-3-oxo-2H-benzo[b][1,4]oxazin-7-yl)acetamides and their positive inotropic evaluation. Bioorg Med Chem Lett 2010; 20:4464-7. [PMID: 20591664 DOI: 10.1016/j.bmcl.2010.06.046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2010] [Revised: 05/17/2010] [Accepted: 06/08/2010] [Indexed: 10/19/2022]
Abstract
Herein we describe the discovery of compound 3g, a potent positive inotropic agent compared with the standard drug, milrinone. Compound 3g was developed from a series of 2-(4-substitutedbenzyl-1,4-diazepan-1-yl)-N-(3,4-dihydro-3-oxo-2H-benzo[b][1,4]oxazin-7-yl) acetamides found in an evaluation of inotropic activity by measuring left atrium stroke volume on isolated rabbit heart preparations. Several compounds showed favorable activities, but 3g was the most potent, with 7.68+/-0.14% increased stroke volume (milrinone 2.38+/-0.05%) at 1 x 10(-5)M in our in vitro study. The chronotropic effects of compounds having significant inotropic effects were also evaluated.
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Affiliation(s)
- Kun Yang
- Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules, Ministry of Education, Yanbian University College of Pharmacy, Yanji 133000, PR China
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Han JH, Kim KA, Shah A, Park BH, Park WH, Kim SH. Regulation of renin release by connexin 43 in As 4.1 cell line. Peptides 2010; 31:899-902. [PMID: 20188775 DOI: 10.1016/j.peptides.2010.02.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2010] [Revised: 02/17/2010] [Accepted: 02/17/2010] [Indexed: 10/19/2022]
Abstract
Gap junction channels facilitate chemical and electrical communication between adjacent cells. Gap junction protein, connexin (Cx), is expressed in the endothelial cells of vessels, glomerulus, and renin-secreting cells of the kidney. The purpose of this study was to investigate the role of Cx in renin release using Cx-overexpressing As 4.1 cells. The adenovirus-induced Cx overexpression was conducted by using recombinant adenovirus containing the cDNA encoding Cx37, Cx40, Cx43 (Ad-Cx), and beta-galactosidase (Ad-beta-gal). In 40-overexpressing cells, basal renin release increased in a time-dependent manner but it was significantly lower than that in Ad-beta-gal-treated cells. In Cx37- and Cx43-overexpressing cells, basal renin release was increased in a time-dependent manner, which was not different from control cells. 18-beta glycyrrhetinic acid (GA), a gap junction blocker, stimulated renin release dose-dependently and increased intracellular Ca(2+) in both Cx43-overexpressing cells and control cells. However, no significant differences were observed. An increase in renin release by 3,4,5-trimethoxybenzoic acid 8-(diethylamino)-octyl ester, a putative antagonist of Ca(2+) release from intracellular sequestration sites, was also similar between two groups. These results suggest that Cx43 may unlikely alter the regulation of renin release and intracellular Ca(2+) by gap junction blocker in As 4.1 cells.
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Affiliation(s)
- Jeong Hee Han
- Department of Physiology, Diabetic Research Center, Chonbuk National University Medical School, Jeonju, Republic of Korea
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Shah A, Gul R, Yuan K, Gao S, Oh YB, Kim UH, Kim SH. Angiotensin-(1-7) stimulates high atrial pacing-induced ANP secretion via Mas/PI3-kinase/Akt axis and Na+/H+ exchanger. Am J Physiol Heart Circ Physiol 2010; 298:H1365-74. [PMID: 20190099 DOI: 10.1152/ajpheart.00608.2009] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Angiotensin-(1-7) [ANG-(1-7)], one of the bioactive peptides produced in the renin-angiotensin system, plays a pivotal role in cardiovascular physiology by providing a counterbalance to the function of ANG II. Recently, it has been considered as a potential candidate for therapeutic use in the treatment of various types of cardiovascular diseases. The aim of the present study is to explain the modulatory role of ANG-(1-7) in atrial natriuretic peptide (ANP) secretion and investigate the functional relationship between two peptides to induce cardiovascular effects using isolated perfused beating rat atria and a cardiac hypertrophied rat model. ANG-(1-7) (0.01, 0.1, and 1 muM) increased ANP secretion and ANP concentration in a dose-dependent manner at high atrial pacing (6.0 Hz) with increased cGMP production. However, at low atrial pacing (1.2 Hz), ANG-(1-7) did not cause changes in atrial parameters. Pretreatment with an antagonist of the Mas receptor or with inhibitors of phosphatidylinositol 3-kinase (PI3K), protein kinase B (Akt), or nitric oxide synthase blocked the augmentation of high atrial pacing-induced ANP secretion by ANG-(1-7). A similar result was observed with the inhibition of the Na(+)/H(+) exchanger-1 and Ca(2+)/calmodulin-dependent kinase II (CaMKII). ANG-(1-7) did not show basal intracellular Ca(2+) signaling in quiescent atrial myocytes. In an in vivo study using an isoproterenol-induced cardiac hypertrophy animal model, an acute infusion of ANG-(1-7) increased the plasma concentration of ANP by twofold without changes in blood pressure and heart rate. A chronic administration of ANG-(1-7) increased the plasma ANP level and attenuated isoproterenol-induced cardiac hypertrophy. The antihypertrophic effect was abrogated by a cotreatment with the natriuretic peptide receptor-A antagonist. These results suggest that 1) ANG-(1-7) increased ANP secretion at high atrial pacing via the Mas/PI3K/Akt pathway and the activation of Na(+)/H(+) exchanger-1 and CaMKII and 2) ANG-(1-7) decreased cardiac hypertrophy which might be mediated by ANP.
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Affiliation(s)
- Amin Shah
- Department of Physiology, Chonbuk National University Medical School, 2-20 Keum-Am-Dong-San, Jeonju, Korea.
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25
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Liu JY, Yu HL, Quan ZS, Cui X, Piao HR. Synthesis and inotropic evaluation of 1-substituted-N-(4,5-dihydro-1-methyl-[1,2,4]triazolo[4,3-a]quinolin-7-yl)piperidine-4-carboxamides. Bioorg Med Chem Lett 2009; 19:2392-5. [PMID: 19356931 DOI: 10.1016/j.bmcl.2009.03.089] [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] [Received: 01/11/2009] [Revised: 03/05/2009] [Accepted: 03/23/2009] [Indexed: 01/07/2023]
Abstract
A series of 1-substituted-N-(4,5-dihydro-1-methyl-[1,2,4]triazolo[4,3-a]quinolin-7-yl) piperidine-4-carboxamides has been synthesized and evaluated for positive inotropic activity by measuring left atrium stroke volume in isolated rabbit-heart preparations. Some of these derivatives exhibited favorable activity compared with the standard drug, milrinone, among which 1-(2-fluorobenzyl)-N-(4,5-dihydro-1-methyl-[1,2,4]triazolo[4,3-a]quinolin-7-yl)piperidine-4-carboxamide 6a was the most potent, increasing stroke volume by 11.92+/-0.35% (milrinone: 6.36+/-0.13%) at 1x10(-4)M.
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Affiliation(s)
- Ji-Yong Liu
- Changbai Mountain Key Laboratory of Natural Resources and Functional Molecules, Affiliated Ministry of Education, Yanbian University College of Pharmacy, Yanji 133000, PR China
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26
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Li JY, Cui X, Liu XK, Hong L, Quan ZS, Piao HR. Synthesis and Positive Inotropic Evaluation of 2-(4-(4-Substituted benzyloxy)-3-methoxybenzyl)-1,4-diazepan-1-yl)-N-(4,5-dihydro-1-methyl[1,2,4]triazolo[4,3-a]quinolin-7-yl)-acetamides. Arch Pharm (Weinheim) 2008; 341:794-9. [DOI: 10.1002/ardp.200800132] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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27
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Zhang CB, Cui X, Hong L, Quan ZS, Piao HR. Synthesis and positive inotropic activity of N-(4,5-dihydro-[1,2,4]triazolo[4,3-a]quinolin-7-yl)-2-(piperazin-1-yl)acetamide derivatives. Bioorg Med Chem Lett 2008; 18:4606-9. [PMID: 18657421 DOI: 10.1016/j.bmcl.2008.07.026] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2008] [Revised: 07/05/2008] [Accepted: 07/09/2008] [Indexed: 12/01/2022]
Abstract
A series of N-(4,5-dihydro-[1,2,4]triazolo[4,3-a]quinolin-7-yl)-2-(piperazin-1-yl)acetamide derivatives were synthesized and their positive inotropic activity was evaluated by measuring left atrium stroke volume on isolated rabbit heart preparations. Several compounds showed favorable activity compared with the standard drug, milrinone, among which N-(1-benzyl-4,5-dihydro-[1,2,4]triazolo[4,3-a]quinolin-7-yl)-2-(4-benzylpiperazin-1-yl)acetamide 6j was found to be the most potent with the 13.2% increased stroke volume (milrinone 4.7%) at concentration of 3x10(-5) M in our in vitro study. The chronotropic effects of those compounds having inotropic effects were also evaluated in this work.
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Affiliation(s)
- Chun-Bo Zhang
- Key Laboratory of Natural Resources and Functional Molecules of the Changbai Mountain, Yanbian University, Ministry of Education, Yanji, Jilin 133002, PR China
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28
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Zhang Y, Liu LP, Liang ZL, Li XL, Jin YZ, Cui X. cAMP produced by pituitary adenylate cyclase-activating polypeptide 27 inhibits atrial natriuretic peptide secretion in rabbit beating atria. Clin Exp Pharmacol Physiol 2008; 35:1233-7. [PMID: 18637020 DOI: 10.1111/j.1440-1681.2008.04996.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The aim of the present study was to determine the effects of increased cAMP levels in response to pituitary adenylate cyclase-activating polypeptide 27 (PACAP27) on atrial atrial natriuretic peptide (ANP) secretion in rabbit atria. A perfused beating atrial model was used in the present study and cAMP efflux and ANP levels in atrial perfusates were measured by radioimmnoassay. At 100 nmol/L, PACAP27 increased cAMP production, which resulted in subsequent inhibition of ANP secretion. Nicardipine (1.0 micromol/L), an L-type Ca2+ channel blocker, attenuated inhibition of ANP secretion by PACAP27. Staurosporine (1.0 micromol/L), a non-specific protein kinase inhibitor, and H-89 (1.0 micromol/L), a cAMP-dependent protein kinase A (PKA) inhibitor, completely blocked the inhibition of ANP secretion in response to PACAP27 but had no effect on PACAP27-induced increases in cAMP. In conclusion, the results suggest that increased cAMP levels in response to PACAP27 negatively regulate ANP secretion via the adenylate cyclase-cAMP-PKA signalling pathway in rabbit atria and that L-type Ca2+ channels may be involved, in part, in the regulation of ANP secretion by cAMP.
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Affiliation(s)
- Ying Zhang
- Department of Physiology, School of Basic Medical Sciences, Yanbian University, Yanji, China
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Heaton DA, Lei M, Li D, Golding S, Dawson TA, Mohan RM, Paterson DJ. Remodeling of the cardiac pacemaker L-type calcium current and its beta-adrenergic responsiveness in hypertension after neuronal NO synthase gene transfer. Hypertension 2006; 48:443-52. [PMID: 16847148 DOI: 10.1161/01.hyp.0000233383.04280.3c] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Hypertension is associated with abnormal neurohumoral activation. We tested the hypothesis that beta-adrenergic hyperresponsiveness in the sinoatrial node (SAN) of the spontaneously hypertensive rat occurs at the level of the L-type calcium current because of altered cyclic nucleotide-dependent signaling. Furthermore, we hypothesized that NO, a modulator of cGMP and cAMP, would normalize the beta-adrenergic phenotype in the hypertensive rat. Chronotropic responsiveness to norepinephrine (NE), together with production of cAMP and cGMP, was assessed in isolated atrial preparations from age-matched hypertensive and normotensive rats. Right atrial/SAN pacemaking tissue was injected with adenovirus encoding enhanced green fluorescent protein (control vector) or neuronal NO synthase (nNOS). In addition, L-type calcium current was measured in cells isolated from the SAN of transfected animals. Basal levels of cGMP were lower in hypertensive rat atria. These atria were hyperresponsive to NE at all of the concentrations tested, with elevated production of cAMP. This was accompanied by increased basal and norepinephrine-stimulated L-type calcium current. Using enhanced green fluorescent protein, we observed transgene expression within both tissue sections and isolated pacemaking cells. Adenoviral nNOS increased right atrial nNOS protein expression and cGMP content. NE-stimulated cAMP concentration and L-type calcium current were also attenuated by adenoviral nNOS, along with the chronotropic responsiveness to NE in hypertensive rat atria. Decreased calcium current after cardiac nNOS gene transfer contributes to the normalization of beta-adrenergic hyperresponsiveness in the SAN from hypertensive rats by modulating cyclic nucleotide signaling.
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Affiliation(s)
- Daniel A Heaton
- Burdon Sanderson Cardiac Science Centre, Department of Physiology, Anatomy and Genetics, Oxford, United Kingdom
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Shanshan P, Yan Z, Aiyun L, Chen P. Effect of exercise on gene expression of atrial natriuretic peptide receptor of kidney. Life Sci 2005; 76:1921-8. [PMID: 15707875 DOI: 10.1016/j.lfs.2004.07.034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2004] [Accepted: 07/13/2004] [Indexed: 10/25/2022]
Abstract
To study the effect of exercise on gene expression of natriuretic peptide receptors (NPRs) in the kidney, with in situ hybridization and the computerized image analysis, we investigated the alterations of gene expression of NPRs on the animal model of exercise training of different intensity. We found that after exercise training of different intensity, renal NPR-A mRNA and NPR-C mRNA expression showed different changes, the expression of NPR-A mRNA upregulated and NPR-C mRNA downregulated in the kidney. With the increase exercise intensity, change in NPR-A mRNA expression was insignificant, but downregulation in NPR-C mRNA expression was more significant. The result suggested that the effect of exercise on renal NPRs mRNA expression was mainly on the modulation level of NPR-C mRNA, it could reduce the clearance rate of ANP, increase the level of ANP, and enhance the biological effect of ANP on the kidney and regulative action of kidney in exercise.
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Affiliation(s)
- Pan Shanshan
- Department of Exercise Science, Shanghai Institute of Physical Education, Shanghai, 200438 China.
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Piao FL, Park SH, Han JH, Cao C, Kim SZ, Kim SH. Dendroaspis natriuretic peptide and its functions in pig ovarian granulosa cells. ACTA ACUST UNITED AC 2005; 118:193-8. [PMID: 15003836 DOI: 10.1016/j.regpep.2003.12.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2003] [Revised: 12/16/2003] [Accepted: 12/23/2003] [Indexed: 10/26/2022]
Abstract
Dendroaspis natriuretic peptide (DNP), a 38-amino acid peptide, was isolated from the venom of green mamba. It has structural and functional similarities to the other members of the natriuretic peptide family. The purpose of this study was to determine whether DNP is present in pig ovarian granulosa cells and to define its biological functions. The serial dilution curves of extracts of granulosa cells and follicular fluid were parallel to the standard curve of DNP, and a major peak of molecular profile of both extracts by HPLC was synthetic DNP. The concentration of DNP was 7.51+/-1.46 pg/10(7) cells and 24.81+/-2.38 pg/ml in granulosa cells and follicular fluid, respectively. Natriuretic peptides increased cGMP production in the purified membrane of granulosa cells with a rank order of potency of C-type natriuretic peptide (CNP)>atrial natriuretic peptide (ANP)=DNP. mRNAs for natriuretic peptide receptor-A (NPR-A), NPR-B and NPR-C were detected by RT-PCR. The binding site of (125)I-DNP was also observed in granulosa cell layer by in vitro autoradiography. Synthetic DNP inhibited the secretion of ANP from granulosa cells in a concentration-dependent manner and the potency was similar to CNP. The concentration of DNP and CNP, which inhibited the secretion of ANP by 50%, was about 1 nM. Increases in production of cGMP in granulosa cells were observed by DNP or CNP. Therefore, these results show the existence of DNP system and the cross-talk between natriuretic peptides in pig ovarian granulosa cells.
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Affiliation(s)
- Feng Lian Piao
- Department of Physiology, Medical School, Institute for Medical Sciences, Chonbuk National University, 2-20 Keum-Am-Dong-San, Jeonju 560-181, South Korea
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Wen JF, Cui X, Jin JY, Kim SM, Kim SZ, Kim SH, Lee HS, Cho KW. High and low gain switches for regulation of cAMP efflux concentration: distinct roles for particulate GC- and soluble GC-cGMP-PDE3 signaling in rabbit atria. Circ Res 2004; 94:936-43. [PMID: 14988225 DOI: 10.1161/01.res.0000123826.70125.4d] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This study tests the hypothesis that particulate (p) guanylyl cyclase (GC) and soluble (s) GC are involved in the distinct roles for the regulation of cGMP-PDE-cAMP signaling and of mechanical and secretory functions in the heart. Experiments were performed in perfused beating rabbit atria. C-type natriuretic peptide (CNP) and SIN-1, an NO donor, or BAY 41-2272 (BAY), a direct activator for sGC, were used to activate pGC and sGC, respectively. CNP and SIN-1 increased cGMP and cAMP efflux in a concentration-dependent manner. Increase in cAMP was a function of cGMP. The changes in cAMP efflux concentration in terms of cGMP were much more prominent in the atria treated with CNP than in the atria treated with SIN-1. Increase in cAMP efflux concentration was blocked by milrinone but not changed by EHNA. BAY increased cGMP but not cAMP in a concentration-dependent manner. CNP and SIN-1 decreased atrial stroke volume and myocytic ANP release. The decreases in terms of cGMP efflux concentration were much more prominent in the atria treated with CNP than in the atria treated with SIN-1 or BAY. Milrinone accentuated GC agonist-induced decreases in atrial stroke volume and ANP release. In the presence of ODQ, SIN-1 or BAY induced effects were not observed. These data suggest that pGC and sGC activations have distinct roles via cGMP-PDE3-cAMP signaling in the cardiac atrium: high and low gain switches, respectively, for the regulation of cAMP levels and contractile and secretory functions.
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MESH Headings
- 3',5'-Cyclic-AMP Phosphodiesterases/antagonists & inhibitors
- 3',5'-Cyclic-AMP Phosphodiesterases/physiology
- Adenine/analogs & derivatives
- Adenine/pharmacology
- Animals
- Atrial Natriuretic Factor/metabolism
- Biological Transport/drug effects
- Cardiac Pacing, Artificial
- Cyclic AMP/metabolism
- Cyclic GMP/physiology
- Cyclic Nucleotide Phosphodiesterases, Type 2
- Cyclic Nucleotide Phosphodiesterases, Type 3
- Enzyme Inhibitors/pharmacology
- Guanylate Cyclase/physiology
- Heart Atria/enzymology
- Heart Atria/metabolism
- Milrinone/pharmacology
- Molsidomine/analogs & derivatives
- Molsidomine/pharmacology
- Myocardial Contraction
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/enzymology
- Myocytes, Cardiac/metabolism
- Natriuretic Peptide, C-Type/pharmacology
- Nitric Oxide Donors/pharmacology
- Oxadiazoles/pharmacology
- Phosphodiesterase Inhibitors/pharmacology
- Phosphoric Diester Hydrolases/physiology
- Pyrazoles/pharmacology
- Pyridines/pharmacology
- Quinoxalines/pharmacology
- Rabbits
- Receptors, Cytoplasmic and Nuclear/antagonists & inhibitors
- Receptors, Cytoplasmic and Nuclear/physiology
- Second Messenger Systems/physiology
- Soluble Guanylyl Cyclase
- Stroke Volume/drug effects
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Affiliation(s)
- Jin Fu Wen
- Department of Physiology, Institute for Medical Sciences, Jeonbug National University Medical School, Jeonju, Korea
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Lee KS, Kim SY, Han JH, Kim YA, Cao C, Kim SZ, Cho KW, Kim SH. Different responses of atrial natriuretic peptide secretion and its receptor density to salt intake in rats. Exp Biol Med (Maywood) 2004; 229:65-71. [PMID: 14709778 DOI: 10.1177/153537020422900108] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
This study investigated whether high-salt intake influences atrial natriuretic peptide (ANP) system, atrial content, and release rate of ANP as well as receptor density in the kidney were measured in salt intake rats. Male Sprague-Dawley rats received either 0.9% or 2% salt in their drinking water for 10 days. The stretch-induced ANP secretion from isolated perfused non-beating left atria was accentuated, and the production of cGMP by ANP in renal cortical tissue membranes were pronounced in rats exposed to 0.9% salt for 10 days but not in rats exposed to 2% salt. The levels of ANP receptor density and expression in renal cortex were decreased in 2% salt intake rats but not in 0.9% salt intake rats. No significant differences in atrial and plasma concentrations of ANP and water balance were observed in both salt intakes. Therefore, these results suggest that atrial ANP secretion and its binding sites in the kidney may respond differently to ingested salt concentrations in rats.
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Affiliation(s)
- Kyung Sun Lee
- Department of Physiology, Medical School, Institute for Medical Sciences, Chonbuk National University, Jeonju 561-180, Korea
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Han JH, Cao C, Kim SM, Piao FL, Kim SH. Attenuation of Lysophosphatidylcholine-Induced Suppression of ANP Release From Hypertrophied Atria. Hypertension 2004; 43:243-8. [PMID: 14662652 DOI: 10.1161/01.hyp.0000107779.92645.89] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Lysophosphatidylcholine (LPC) is an endogenous phospholipid released from the cell membrane during ischemia, and it has potent cardiac effects, including inhibition of atrial natriuretic peptide (ANP) release. The aim of this study was to investigate the effects of LPC on hemodynamics and ANP release in hypertrophied atria and to define its mechanism. Isolated, perfused, beating, hypertrophied atria from monocrotaline-treated rats were used. LPC (30 μmol/L), a mixture of stearoyl-LPC, palmitoyl-LPC, and oleoyl-LPC, caused suppression of ANP release, which was markedly attenuated in hypertrophied atria compared with nonhypertrophied atria. Suppression of ANP release by stearoyl-LPC, palmitoyl-LPC, or oleoyl-LPC was also attenuated in hypertrophied atria. The potency appeared to be dependent on the species of fatty acid residue of LPC. Changes in ANP release by LPC, palmitoyl-LPC, and oleoyl-LPC were positively correlated with the degree of cardiac hypertrophy, but that by stearoyl-LPC was not. Changes in ANP release by LPC also were negatively correlated with changes in pulse pressure. Stearoyl-LPC caused an increase in intracellular Ca
2+
in single, atrial myocytes in a concentration-dependent manner, which was markedly attenuated in hypertrophied atrial myocytes. These results suggest that attenuation of LPC-induced suppression of ANP release from hypertrophied atria might partly be related to changes in pulse pressure in terms of cardiac hypertrophy and/or disturbance of intracellular Ca
2+
regulation.
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Affiliation(s)
- Jeong Hee Han
- Department of Physiology, Medical School, Institute for Medical Sciences, Chonbuk National University, Jeonju, Korea
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35
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Rose RA, Lomax AE, Giles WR. Inhibition of L-type Ca2+ current by C-type natriuretic peptide in bullfrog atrial myocytes: an NPR-C-mediated effect. Am J Physiol Heart Circ Physiol 2003; 285:H2454-62. [PMID: 12881210 DOI: 10.1152/ajpheart.00388.2003] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Single atrial myocytes were isolated from the bullfrog heart and studied under current and voltage clamp conditions to determine the electrophysiological effects of the C-type natriuretic peptide (CNP). CNP (10(-8) M) significantly shortened the action potential and reduced its peak amplitude after the application of isoproteronol (10(-7) M). In voltage clamp studies, CNP inhibited isoproteronol-stimulated L-type Ca2+ current (ICa) without any significant effect on the inward rectifier K+ current. The effects of cANF (10(-8) M), a selective agonist of the natriuretic peptide C receptor (NPR-C), were very similar to those of CNP. Moreover, HS-142-1, an antagonist of the guanylyl cyclase-linked NPR-A and NPR-B receptors did not alter the inhibitory effect of CNP on ICa. Inclusion of cAMP in the recording pipette to stimulate ICa at a point downstream from adenylyl cyclase increased ICa, but this effect was not inhibited by cANF. These results provide the first demonstration that CNP can inhibit ICa after binding to NPR-C, and suggest that this inhibition involves a decrease in adenylyl cyclase activity, which leads to reduced intracellular levels of cAMP.
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Affiliation(s)
- R A Rose
- Department of Physiology and Biophysics, Faculty of Medicine, University of Calgary, 3330 Hospital Dr. NW, Calgary, Alberta, Canada T2N 4N1
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36
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Li D, Wen JF, Jin JY, Jin H, Ann HS, Kim SZ, Kim SH, Lee HS, Cho KW. Histamine inhibits atrial myocytic ANP release via H2 receptor-cAMP-protein kinase signaling. Am J Physiol Regul Integr Comp Physiol 2003; 285:R380-93. [PMID: 12714356 DOI: 10.1152/ajpregu.00666.2002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Changes in cyclic nucleotide production and atrial dynamics have been known to modulate atrial natriuretic peptide (ANP) release. Although cardiac atrium expresses histamine receptors and contains histamine, the role of histamine in the regulation of ANP release has to be defined. The purpose of the present study was to define the effect of histamine on the regulation of ANP release in perfused beating rabbit atria. Histamine decreased ANP release concomitantly with increases in cAMP efflux and atrial dynamics in a concentration-dependent manner. Histamine-induced decrease in ANP release was a function of an increase in cAMP production. Blockade of histamine H2 receptor with cimetidine but not of H1 receptor with triprolidine abolished the responses of histamine. Cell-permeable cAMP analog, 8-Br-cAMP, mimicked the effects of histamine, and the responses were dose-dependent and blocked by a protein kinase A (PKA)-selective inhibitor, KT5720. Nifedipine failed to modulate histamine-induced decrease in ANP release. Protein kinase nonselective inhibitor staurosporine blocked histamine-induced changes in a concentration-dependent manner. KT5720 and RP-adenosine 3',5'-cyclic monophosphorothioate, another PKA-selective inhibitor, attenuated histamine-induced changes. These results suggest that histamine decreases atrial ANP release by H2 receptor-cAMP signaling via PKA-dependent and -independent pathways.
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Affiliation(s)
- Dan Li
- Department of Physiology, Institute for Medical Sciences, Jeonbug National University Medical School, Jeonju 561-180, Korea
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37
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Han JH, Cao C, Kim SZ, Cho KW, Kim SH. Decreases in ANP secretion by lysophosphatidylcholine through protein kinase C. Hypertension 2003; 41:1380-5. [PMID: 12719444 DOI: 10.1161/01.hyp.0000071317.98004.b3] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Lysophosphatidylcholine (LPC) is an endogenous phospholipid released from the cell membrane during ischemia, and it has potent, local effects on cardiac tissues. LPC has been implicated in arrhythmogenesis during ischemia by increasing intracellular Ca2+. However, it is not known whether LPC influences atrial release of atrial natriuretic peptide (ANP). The aim of this study was to investigate the effect of LPC on ANP secretion from isolated, perfused, beating rat atria. LPC (10 and 30 micromol/L) caused decreases in ANP secretion in a dose-dependent manner, with slight increases in intra-atrial pressure and extracellular fluid (ECF) translocation. Therefore, the ANP secretion in terms of ECF translocation was markedly decreased by LPC. The order of the suppressive effect of ANP release was stearoyl-LPC>LPC>myristoyl-LPC=lauroyl-LPC. Staurosporine and wortmannin significantly attenuated suppression of the ANP release and an increase in intra-atrial pressure by LPC. High extracellular Mg2+ also attenuated the LPC-induced suppression of ANP release. However, other protein kinase C inhibitors such as chelerythrine, GF 109203X, and tamoxifen citrate did not affect LPC-induced suppression of ANP release. In single atrial myocytes, LPC caused increases in intracellular Ca2+ in a dose-dependent manner. The order of an increase in intracellular Ca2+ by LPC was stearoyl-LPC>LPC>myristoyl-LPC=lauroyl-LPC. An increase in intracellular Ca2+ by LPC was attenuated by staurosporine. These results suggest that LPC-induced suppression of ANP release through protein kinase C/Ca2+ and phosphoinositol-3-kinase might in part play an important role in the development of hypertension.
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Affiliation(s)
- Jeong Hee Han
- Department of Physiology, Institute for Medical Sciences, Chonbuk National University Medical School, Jeonju 561-180, Korea
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38
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Seul KH, Han JH, Kang KY, Kim SZ, Kim SH. Regulation of ANP secretion by cardiac Na+/Ca2+ exchanger using a new controlled atrial model. Am J Physiol Regul Integr Comp Physiol 2003; 284:R31-40. [PMID: 12388435 DOI: 10.1152/ajpregu.00408.2002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The myocardial interstitium is important in regulating cardiac function. Between the atrial lumen and the pericardial space are transmural pathways, and movement of interstitial fluid (ISF) through these pathways is one of the main driving forces regulating translocation of substances from the interstitium into the blood. To define how ISF translocation from the interstitial space into the luminal space is regulated by each component of atrial hemodynamics, we devised a new rabbit atrial model in which each physical parameter could be controlled independently. Using this system, we also defined the physiological role of the cardiac Na(+)/Ca(2+) exchanger on secretion of atrial natriuretic peptide (ANP) by depletion of extracellular Na(+) ([Na(+)](o)). Increases in stroke volume and atrial end-systolic volume increased ISF translocation and ANP secretion. However, an increase in atrial rate did not influence ISF translocation but, rather, increased ANP secretion. Gradual depletion of [Na(+)](o) caused gradual increases in ANP secretion and intracellular Ca(2+) ([Ca(2+)](i)), which were blocked in the presence of Ca(2+)-free buffer and Ni(2+), but not in the presence of KB-R7943, diltiazem, mibefradil, caffeine, or monensin. Amiloride and its analog blocked an increase in ANP secretion but not an increase in [Ca(2+)](i) by [Na(+)](o) depletion. Therefore, we suggest that ANP secretion and ISF translocation may be differently controlled by each physical factor. These results also suggest that the increase in ANP secretion in response to [Na(+)](o) depletion may involve inhibition of Na(+)/Ca(2+) and Na(+)/H(+) exchangers but not an increase in [Ca(2+)](i).
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Affiliation(s)
- Kyung Hwan Seul
- Department of Physiology, Medical School, Institute for Medical Sciences, Chonbuk National University, Jeonju 561-180, Republic of Korea
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39
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Page E, Iida H, Doyle DD. Cell Physiology and Cell Biology of Myocardial Cell Caveolae. Compr Physiol 2002. [DOI: 10.1002/cphy.cp020103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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40
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Fenelon G, Protter AA, Stambler BS. Examination of the in vivo cardiac electrophysiological effects of nesiritide (human brain natriuretic peptide) in conscious dogs. J Card Fail 2002; 8:320-5. [PMID: 12411983 DOI: 10.1054/jcaf.2002.127772] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
BACKGROUND Human brain natriuretic peptide (hBNP) is a new therapeutic agent, nesiritide, indicated in patients with decompensated congestive heart failure, a group at significant risk of developing cardiac arrhythmias. Whether hBNP has cardiac electrophysiologic effects has not been reported. METHODS AND RESULTS In 9 healthy, chronically instrumented, conscious dogs, hemodynamic and electrophysiologic parameters were assessed at baseline and during recombinant hBNP (nesiritide) infusion at 0.03 and 0.09 microg/kg/min after 1 hour at each dose. Infusion of hBNP produced dose-related increases (P <.001) in hBNP and cyclic GMP plasma levels and reductions (P <.05) in mean arterial pressure. Mean central venous pressure and sinus cycle length did not change significantly. Infusion of hBNP produced no significant changes in any of the electrophysiologic parameters including no change in surface ECG variables (P wave duration, PR interval, QRS duration, and QTc interval), corrected sinus node recovery time, atrioventricular nodal Wenckebach cycle length, and atrial and ventricular effective refractory periods measured at a 400 ms cycle length. Spontaneous or induced arrhythmias were not observed during hBNP infusion. CONCLUSIONS In conscious, healthy dogs, short-term infusion of recombinant hBNP has no significant effects on atrial or ventricular electrophysiologic parameters.
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MESH Headings
- Animals
- Arrhythmias, Cardiac/chemically induced
- Arrhythmias, Cardiac/physiopathology
- Consciousness/physiology
- Cyclic GMP/blood
- Dogs
- Dose-Response Relationship, Drug
- Electric Stimulation
- Electrocardiography
- Electrophysiologic Techniques, Cardiac
- Heart Atria/drug effects
- Heart Conduction System/drug effects
- Heart Conduction System/physiology
- Heart Ventricles/drug effects
- Hemodynamics/drug effects
- Infusions, Intravenous
- Models, Animal
- Models, Cardiovascular
- Natriuretic Agents/physiology
- Natriuretic Peptide, Brain/blood
- Natriuretic Peptide, Brain/drug effects
- Natriuretic Peptide, Brain/pharmacology
- Reference Values
- Treatment Outcome
- Ventricular Function
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Affiliation(s)
- Guilherme Fenelon
- Department of Medicine, West Roxbury Veterans Affairs Medical Center, Harvard Medical School, West Roxbury, Massachusetts, USA
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41
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Effects of Extracorporeal Shock Wave Lithotripsy on Plasma Levels of Nitric Oxide and Cyclic Nucleotides in Human Subjects. J Urol 2002. [DOI: 10.1097/00005392-200207000-00011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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42
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Park JK, Cui Y, Kim MK, Kim YG, Kim SH, Kim SZ, Cho KW. Effects of Extracorporeal Shock Wave Lithotripsy on Plasma Levels of Nitric Oxide and Cyclic Nucleotides in Human Subjects. J Urol 2002. [DOI: 10.1016/s0022-5347(05)64827-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jong Kwan Park
- From the Departments of Urology and Physiology, Chonbuk National University Medical School and Chonbuk National University Institute for Medical Sciences and Research Institute of Clinical Medicine of Chonbuk National University Hospital, Chonju, South Korea
| | - Yong Cui
- From the Departments of Urology and Physiology, Chonbuk National University Medical School and Chonbuk National University Institute for Medical Sciences and Research Institute of Clinical Medicine of Chonbuk National University Hospital, Chonju, South Korea
| | - Myung K.I. Kim
- From the Departments of Urology and Physiology, Chonbuk National University Medical School and Chonbuk National University Institute for Medical Sciences and Research Institute of Clinical Medicine of Chonbuk National University Hospital, Chonju, South Korea
| | - Young Gon Kim
- From the Departments of Urology and Physiology, Chonbuk National University Medical School and Chonbuk National University Institute for Medical Sciences and Research Institute of Clinical Medicine of Chonbuk National University Hospital, Chonju, South Korea
| | - Suhn Hee Kim
- From the Departments of Urology and Physiology, Chonbuk National University Medical School and Chonbuk National University Institute for Medical Sciences and Research Institute of Clinical Medicine of Chonbuk National University Hospital, Chonju, South Korea
| | - Sung Zoo Kim
- From the Departments of Urology and Physiology, Chonbuk National University Medical School and Chonbuk National University Institute for Medical Sciences and Research Institute of Clinical Medicine of Chonbuk National University Hospital, Chonju, South Korea
| | - Kyung Woo Cho
- From the Departments of Urology and Physiology, Chonbuk National University Medical School and Chonbuk National University Institute for Medical Sciences and Research Institute of Clinical Medicine of Chonbuk National University Hospital, Chonju, South Korea
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43
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Kim SH, Han JH, Cao C, Kim SZ, Cho KW. Postnatal changes in inhibitory effect of C-type natriuretic peptide on secretion of ANP. Am J Physiol Regul Integr Comp Physiol 2002; 282:R1672-9. [PMID: 12010749 DOI: 10.1152/ajpregu.00563.2001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
To define developmental changes in atrial natriuretic peptide (ANP) secretion and in the cross talk between C-type natriuretic peptide (CNP) and ANP, we performed experiments in isolated perfused nonbeating cardiac atria isolated from rabbits between 1 and 8 wk of age. Changes in atrial pressure resulted in increases in atrial volume that rose with age and reached the peak value at 4 wk. A rise in volume change increased ANP secretion with concomitant translocation of extracellular fluid (ECF) into the atrial lumen, which increased with age and reached the peak value at 4 wk. The positive relationship between stretch-induced ANP secretion and ECF translocation shifted upward and leftward with age. CNP suppressed stretch-induced ANP secretion in the 8-wk-old group but not in the 2- and 4-wk-old groups without differences in ECF translocation and atrial volume. Therefore, the ANP secretion in terms of ECF translocation was markedly suppressed by CNP in the 8-wk-old group but not in the 2- and 4-wk-old groups. The production of cGMP by CNP in atrial tissue membranes was markedly attenuated in young rabbits. However, 8-bromo-cGMP suppressed stretch-induced ANP secretion in 2- and 8-wk-old groups. Natriuretic peptide receptor-B mRNA was similar in both groups. Therefore, we conclude that the inhibitory effect of CNP on atrial ANP secretion is developmentally regulated, being absent during normal cardiac development in young animals and intact in adult animals.
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Affiliation(s)
- Suhn Hee Kim
- Department of Physiology, Medical School, Institute for Medical Sciences, Jeonbug National University, Jeonju 561-180, Korea.
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44
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Cui X, Wen JF, Jin JY, Xu WX, Kim SZ, Kim SH, Lee HS, Cho KW. Protein kinase-dependent and Ca(2+)-independent cAMP inhibition of ANP release in beating rabbit atria. Am J Physiol Regul Integr Comp Physiol 2002; 282:R1477-89. [PMID: 11959692 DOI: 10.1152/ajpregu.00316.2001] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Regulation of atrial release of atrial natriuretic peptide (ANP) is coupled to changes in atrial dynamics. However, the mechanism by which mechanical stretch controls myocytic ANP release must be defined. The purpose of this study was to define the mechanism by which cAMP controls myocytic ANP release in perfused, beating rabbit atria. The cAMP-elevating agents forskolin and 3-isobutyl-1-methylxanthine (IBMX) inhibited myocytic ANP release. The activation of adenylyl cyclase with forskolin inhibited ANP release, which was a function of an increase in cAMP production. Inhibitors for L-type Ca(2+) channels and protein kinase A (PKA) attenuated a minor portion of the forskolin-induced inhibition of ANP release. Gö-6976 and KN-62, which are specific inhibitors for protein kinase C-alpha and Ca(2+)/calmodulin kinase, respectively, failed to modulate forskolin-induced inhibition of ANP release. The nonspecific protein kinase inhibitor staurosporine blocked forskolin-induced inhibition of ANP release in a dose-dependent manner. Staurosporine but not nifedipine shifted the relationship between cAMP and ANP release. Inhibitors for L-type Ca(2+) channels and PKA and staurosporine blocked forskolin-induced accentuation of atrial dynamics. These results suggest that cAMP inhibits atrial myocytic release of ANP via protein kinase-dependent and L-type Ca(2+)-channel-dependent and -independent signaling pathways.
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Affiliation(s)
- Xun Cui
- Department of Physiology, Institute for Medical Sciences, Jeonbug National University Medical School, Jeonju 561-180, Korea
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45
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Lee J, Kim S, Jung M, Oh Y, Kim SW. Altered expression of vascular natriuretic peptide receptors in experimental hypertensive rats. Clin Exp Pharmacol Physiol 2002; 29:299-303. [PMID: 11985539 DOI: 10.1046/j.1440-1681.2002.03647.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
1. The aim of the present study was to determine whether the regulation of vascular natriuretic peptide receptors (NPR) is related to the local renin-angiotensin system (RAS). 2. Male Sprague-Dawley rats were made two-kidney, one-clip (2K1C) and deoxycorticosterone acetate (DOCA)-salt hypertensive to activate and inhibit the RAS, respectively. Another model of hypertension was induced by treatment with an inhibitor of nitric oxide synthesis, namely NG-nitro-L-arginine methyl ester (L-NAME). 3. The mRNA expression of NPR-A, NPR-C, angiotensin- converting enzyme (ACE) and angiotensin AT1 receptors was determined in the thoracic aorta by semiquantitative reverse transcription-polymerase chain reaction. The particulate guanylyl cyclase activity stimulated by atrial natriuretic peptide (ANP) was also determined in the membrane fraction of the thoracic aorta. 4. The plasma concentrations of ANP were increased significantly in the three models of hypertension. Plasma renin activity was increased in 2K1C hypertension, decreased in DOCA-salt hypertension and not significantly altered in L-NAME hypertension. 5. The mRNA expression of NPR-A and NPR-C was decreased, whereas that of ACE and AT1 receptors was increased in 2K1C and L-NAME hypertension. The mRNA expression of NPR-A and NPR-C was increased, whereas that of ACE and AT1 receptors was decreased in DOCA-salt hypertension. 6. The particulate guanylyl cyclase activity was decreased in 2K1C and L-NAME hypertension and increased in DOCA-salt hypertension. 7. The vascular expression of NPR may be reciprocally regulated by local RAS activity.
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MESH Headings
- Animals
- Aorta, Thoracic
- Enzyme Activation
- Guanylate Cyclase/biosynthesis
- Guanylate Cyclase/blood
- Guanylate Cyclase/genetics
- Guanylate Cyclase/metabolism
- Hypertension/chemically induced
- Hypertension/metabolism
- Male
- Peptidyl-Dipeptidase A/biosynthesis
- Peptidyl-Dipeptidase A/genetics
- RNA, Messenger/biosynthesis
- Rats
- Rats, Sprague-Dawley
- Receptor, Angiotensin, Type 1
- Receptors, Angiotensin/biosynthesis
- Receptors, Angiotensin/genetics
- Receptors, Atrial Natriuretic Factor/biosynthesis
- Receptors, Atrial Natriuretic Factor/blood
- Receptors, Atrial Natriuretic Factor/genetics
- Renin/blood
- Renin-Angiotensin System/physiology
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Affiliation(s)
- JongUn Lee
- Department of Physiology and Research Institute of Medical Sciences, Chonnam National University Medical School, Gwangju, Korea.
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46
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Herring N, Zaman JA, Paterson DJ. Natriuretic peptides like NO facilitate cardiac vagal neurotransmission and bradycardia via a cGMP pathway. Am J Physiol Heart Circ Physiol 2001; 281:H2318-27. [PMID: 11709398 DOI: 10.1152/ajpheart.2001.281.6.h2318] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We tested the hypothesis that natriuretic peptide receptors (NPRs) that are coupled to cGMP production act in a similar way to nitric oxide (NO) by enhancing acetylcholine release and vagal-induced bradycardia. The effects of enzyme inhibitors and channel blockers on the action of atrial natriuretic peptide (ANP), brain-derived natriuretic peptide (BNP), and C-type natriuretic peptide (CNP) were evaluated in isolated guinea pig atrial-right vagal nerve preparations. RT-PCR confirmed the presence NPR B and A receptor mRNA in guinea pig sinoatrial node tissue. BNP and CNP significantly (P < 0.05) enhanced the heart rate (HR) response to vagal nerve stimulation. CNP had no effect on the HR response to carbamylcholine and facilitated the release of [(3)H]acetylcholine during atrial field stimulation. The particulate guanylyl cyclase-coupled receptor antagonist HS-142-1, the phosphodiesterase 3 inhibitor milrinone, the protein kinase A inhibitor H89, and the N-type calcium channel blocker omega-conotoxin all blocked the effect of CNP on vagal-induced bradycardia. Like NO, BNP and CNP facilitate vagal neurotransmission and bradycardia. This may occur via a cGMP-PDE3-dependent pathway increasing cAMP-PKA-dependent phosphorylation of presynaptic N-type calcium channels.
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Affiliation(s)
- N Herring
- University Laboratory of Physiology, Oxford, United Kingdom
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47
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Abstract
C-type natriuretic peptide (CNP) is mainly distributed in the brain and vascular endothelium and is considered to act as a local regulator in many tissues. The present study was aimed to determine the presence of CNP system and its biological function in rabbit colon. The serial dilution curves of tissue extracts were parallel to the standard curve of CNP-22. With gel permeation chromatography and reverse-phase HPLC, the major immunoreactive peak of CNP was observed at the same elution time corresponding to the synthetic CNP-53. The concentration of CNP in the mucosal layer of colon was 212.49 +/- 30.44 pg/g tissue wet weight (n = 7), which was significantly higher than that in the muscular layer. The presence of CNP mRNA was also detected by RT-PCR and Southern blot analysis. Production of cGMP by the activation of particulate guanylyl cyclase stimulated by BNP and CNP was higher in membranes obtained from the muscular layer than from mucosal layer. More cGMP was produced by CNP than by ANP. Both natriuretic peptide receptor-A and -B mRNAs were detected by RT-PCR and specific binding sites to 125I-[Tyr(0)]-CNP-22 were mainly localized to the muscular layer. Synthetic CNP inhibited basal tension, frequency and amplitude of basal motility of taenia coli of the right colon. This study showing the presence of CNP system and its biological function in colon suggests that endogenous CNP synthesized in the mucosal layer may have a paracrine function as a local regulator of colonic motility.
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Affiliation(s)
- J H Kim
- Departments of General Surgery and Physiology, Medical School, Institute for Medical Sciences, Jeonbug National University, 560-181, Jeonju, South Korea
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48
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Kim SH, Han JH, Lim SH, Lee SJ, Kim SZ, Cho KW. Attenuation of inhibitory effect of CNP on the secretion of ANP from hypertrophied atria. Am J Physiol Regul Integr Comp Physiol 2001; 281:R1456-63. [PMID: 11641116 DOI: 10.1152/ajpregu.2001.281.5.r1456] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
It has been shown that atrial natriuretic peptide (ANP) influences proliferation of cardiac cells. To define the possible role of C-type natriuretic peptide (CNP) in cardiac hypertrophy, the influence of CNP on the secretion of ANP was studied with the use of perfused nonbeating atria from monocrotaline-treated rats. Increases in atrial volume caused proportional increases in ANP secretion that were markedly suppressed by CNP (10(-6) M) in nonhypertrophied left atria and control right atria but not in hypertrophied right atria. However, increases in atrial volume and mechanically stimulated extracellular fluid (ECF) translocation by CNP were similar to those in the control group. Therefore, the secretion of ANP in terms of ECF translocation was decreased by CNP in nonhypertrophied left and control right atria but not in hypertrophied atria. However, the inhibitory effect of 8-bromo-cGMP on the secretion of ANP was observed in both atria. The cGMP productions from perfused hypertrophied atria and their membranes exposed to CNP were significantly lower than those from nonhypertrophied atria. No significant difference in natriuretic peptide receptor-B transcript was found. Therefore, attenuation of the inhibitory effect of CNP on the ANP secretion in hypertrophied atria may be due to lack of cGMP production. The results showing the relief of CNP-induced negative inhibition of ANP secretion by atrial hypertrophy suggest that CNP may be a contributing factor to delay the development of cardiac hypertrophy.
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Affiliation(s)
- S H Kim
- Department of Physiology, Medical School, Institute for Medical Sciences, Jeonbug National University, Jeonju 560-180, Korea.
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49
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Wen JF, Cui X, Ahn JS, Kim SH, Seul KH, Kim SZ, Park YK, Lee HS, Cho KW. Distinct roles for L- and T-type Ca(2+) channels in regulation of atrial ANP release. Am J Physiol Heart Circ Physiol 2000; 279:H2879-88. [PMID: 11087244 DOI: 10.1152/ajpheart.2000.279.6.h2879] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Atrial secretion of atrial natriuretic peptide (ANP) has been shown to be regulated by atrial workload. Although modulating factors for the secretion of ANP have been reported, the role for intracellular Ca(2+) on the secretion of ANP has been controversial. The purpose of the present study was to define roles for L- and T-type Ca(2+) channels in the regulation of ANP secretion in perfused beating rabbit atria. BAY K 8644 (BAY K) increased atrial stroke volume and pulse pressure. BAY K suppressed ANP secretion and ANP concentration in terms of extracellular fluid (ECF) translocation concomitantly with an increase in atrial dynamics. BAY K shifted the relationship between ANP secretion and ECF translocation downward and rightward. These results indicate that BAY K inhibits myocytic release of ANP. In the continuous presence of BAY K, diltiazem reversed the effects of BAY K. Diltiazem alone increased ANP secretion and ANP concentration along with a decrease in atrial dynamics. Diltiazem shifted relationships between ANP secretion and atrial stroke volume or ECF translocation leftward. The T-type Ca(2+) channel inhibitor mibefradil decreased atrial dynamics. Mibefradil inhibited ANP secretion and ANP concentration in contrast with the L-type Ca(2+) channel inhibitor. These results suggest that activation of L- and T-type Ca(2+) channels elicits opposite effects on atrial myocytic release of ANP.
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Affiliation(s)
- J F Wen
- Department of Physiology, Institute for Medical Sciences, Jeonbug National University Medical School, Jeonju 561-180, Korea
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