1
|
Lee SE, Kim DH, Son SM, Choi SY, You RY, Kim CH, Choi W, Kim HS, Lim YJ, Han JY, Kim HW, Yang IJ, Xu WX, Lee SJ, Kim YC, Yun HY. Physiological function and molecular composition of ATP-sensitive K + channels in human gastric smooth muscle. J Smooth Muscle Res 2020; 56:29-45. [PMID: 32581184 PMCID: PMC7324727 DOI: 10.1540/jsmr.56.29] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Gastric motility is controlled by slow waves. In general, the activation of the
ATP-sensitive K+ (KATP) channels in the smooth muscle
opposes the membrane excitability and produces relaxation. Since metabolic
inhibition and/or diabetes mellitus are accompanied by dysfunctions of gastric
smooth muscle, we examined the possible roles of KATP channels in
human gastric motility. We used human gastric corpus and antrum smooth muscle
preparations and recorded the mechanical activities with a conventional
contractile measuring system. We also identified the subunits of the
KATP channels using Western blot. Pinacidil (10 μM), a
KATP channel opener, suppressed contractions to 30% (basal tone
to −0.2 g) of the control. The inhibitory effect of pinacidil on contraction was
reversed to 59% of the control by glibenclamide (20 μM), a KATP
channel blocker. The relaxation by pinacidil was not affected by a pretreatment
with L-arginine methyl ester, tetraethylammonium, or 4-aminopyridine. Pinacidil
also inhibited the acetylcholine (ACh)-induced tonic and phasic contractions in
a glibenclamide-sensitive manner (42% and 6% of the control, respectively).
Other KATP channel openers such as diazoxide, cromakalim and
nicorandil also inhibited the spontaneous and ACh-induced contractions.
Calcitonin gene-related peptide (CGRP), a gastric neuropeptide, induced muscle
relaxation by the activation of KATP channels in human gastric smooth
muscle. Finally, we have found with Western blot studies, that human gastric
smooth muscle expressed KATP channels which were composed of Kir 6.2
and SUR2B subunits.
Collapse
Affiliation(s)
- Sang Eok Lee
- Department of Surgery, College of Medicine, Konyang University, 158 Gwanjeodong-ro, Seo-gu, Daejeon 35365, Korea
| | - Dae Hoon Kim
- Department of Surgery, College of Medicine, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, Korea
| | - Seung Myeung Son
- Department of Pathology, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, Korea
| | - Song-Yi Choi
- Department of Pathology, School of Medicine, Chungnam National University, Daejeon, Chungnam 35015, Korea
| | - Ra Young You
- Department of Physiology, College of Medicine, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, Korea
| | - Chan Hyung Kim
- Department of Pharmacology, College of Medicine, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, Korea
| | - Woong Choi
- Department of Pharmacology, College of Medicine, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, Korea
| | - Hun Sik Kim
- Department of Pharmacology, College of Medicine, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, Korea
| | - Yung Ji Lim
- College of Medicine, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, Korea
| | - Ji Young Han
- CheongDam I Plastic surgery, 21, Sinheung-ro 240, Uijeonbu-si, Gyronggido 11651, Korea
| | - Hyun Woo Kim
- College of Medicine, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, Korea
| | - In Jun Yang
- Department of Surgery, Seoul Nantional University Bundang Hospital, 166 Gumi-ro, Bundang-gu 13620, Seongnam, Korea
| | - Wen-Xie Xu
- Department of Physiology, College of Medcine, Shanghai Jiaotong University, 800 Dongchun Rd. Shanghai, 200240, P.R. China
| | - Sang Jin Lee
- Department of Physiology, College of Medicine, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, Korea
| | - Young Chul Kim
- Department of Physiology, College of Medicine, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, Korea
| | - Hyo-Yung Yun
- Department of Surgery, College of Medicine, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, Korea
| |
Collapse
|
2
|
Lee SE, Kim DH, Kim YC, Han JH, Choi W, Kim CH, Jeong HW, Park SM, Yun SJ, Choi SY, Sung R, Kim YH, Yoo RY, Sun PH, Kim H, Song YJ, Xu WX, Yun HY, Lee SJ. H2 Receptor-Mediated Relaxation of Circular Smooth Muscle in Human Gastric Corpus: the Role of Nitric Oxide (NO). THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY : OFFICIAL JOURNAL OF THE KOREAN PHYSIOLOGICAL SOCIETY AND THE KOREAN SOCIETY OF PHARMACOLOGY 2014; 18:425-30. [PMID: 25352763 PMCID: PMC4211127 DOI: 10.4196/kjpp.2014.18.5.425] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Revised: 07/21/2014] [Accepted: 07/21/2014] [Indexed: 11/26/2022]
Abstract
This study was designed to examine the effects of histamine on gastric motility and its specific receptor in the circular smooth muscle of the human gastric corpus. Histamine mainly produced tonic relaxation in a concentration-dependent and reversible manner, although histamine enhanced contractility in a minor portion of tissues tested. Histamine-induced tonic relaxation was nerve-insensitive because pretreatment with nerve blockers cocktail (NBC) did not inhibit relaxation. Additionally, K+ channel blockers, such as tetraethylammonium (TEA), apamin (APA), and glibenclamide (Glib), had no effect. However, NG-nitro-L-arginine methyl ester (L-NAME) and 1H-(1,2,4)oxadiazolo (4,3-A) quinoxalin-1-one (ODQ), an inhibitor of soluble guanylate cyclase (sGC), did inhibit histamine-induced tonic relaxation. In particular, histamine-induced tonic relaxation was converted to tonic contraction by pretreatment with L-NAME. Ranitidine, the H2 receptor blocker, inhibited histamine-induced tonic relaxation. These findings suggest that histamine produced relaxation in circular smooth muscle of human gastric smooth muscle through H2 receptor and NO/sGC pathways.
Collapse
Affiliation(s)
- Sang Eok Lee
- Department of Surgery, Konyang University Hospital, Daejeon 302-718, Korea
| | - Dae Hoon Kim
- Department of Surgery, Chungbuk National University College of Medicine, Cheongju 361-763, Korea
| | - Young Chul Kim
- Department of Physiology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea
| | - Joung-Ho Han
- Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju 361-763, Korea
| | - Woong Choi
- Department of Pharmacology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea
| | - Chan Hyung Kim
- Department of Pharmacology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea
| | - Hye Won Jeong
- Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju 361-763, Korea
| | - Seon-Mee Park
- Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju 361-763, Korea
| | - Sei Jin Yun
- Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju 361-763, Korea
| | - Song-Yi Choi
- Department of Pathology, Chungnam National University School of Medicine, Daejeon 305-764, Korea
| | - Rohyun Sung
- Department of Pathology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea
| | - Young Ho Kim
- Department of Otolaryngology, Seoul National University, Borame Medical Center, Seoul 156-707, Korea
| | - Ra Young Yoo
- Department of Physiology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea
| | - Park Hee Sun
- Department of Physiology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea
| | - Heon Kim
- Department of Preventing Medicine, Chungbuk National University College of Medicine, Cheongju 361-763, Korea
| | - Young-Jin Song
- Department of Surgery, Chungbuk National University College of Medicine, Cheongju 361-763, Korea
| | - Wen-Xie Xu
- Department of Physiology, College of Medcine, Shanghai Jiaotong University, Shanghai 200240, P.R. China
| | - Hyo-Yung Yun
- Department of Surgery, Chungbuk National University College of Medicine, Cheongju 361-763, Korea
| | - Sang Jin Lee
- Department of Physiology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea
| |
Collapse
|
3
|
Zhai K, Chang Y, Wei B, Liu Q, Leblais V, Fischmeister R, Ji G. Phosphodiesterase types 3 and 4 regulate the phasic contraction of neonatal rat bladder smooth myocytes via distinct mechanisms. Cell Signal 2014; 26:1001-10. [PMID: 24463006 DOI: 10.1016/j.cellsig.2014.01.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Revised: 12/20/2013] [Accepted: 01/06/2014] [Indexed: 11/28/2022]
Abstract
Activation of the cyclic AMP (cAMP) pathway reduces bladder contractility. However, the role of phosphodiesterase (PDE) families in regulating this function is poorly understood. Here, we compared the contractile function of the cAMP hydrolyzing PDEs in neonatal rat bladder smooth myocytes. RT-PCR and Western blotting analysis revealed that several isoforms of PDE1-4 were expressed in neonatal rat bladder. While 8-methoxymethyl-3-isobutyl-1-methylxanthine (a PDE1 inhibitor) and BAY-60-7550 (a PDE2 inhibitor) had no effect on the carbachol-enhanced phasic contractions of bladder strips, cilostamide (Cil, a PDE3 inhibitor) and Ro-20-1724 (Ro, a PDE4 inhibitor) significantly reduced these contractions. This inhibitory effect of Ro was blunted by the PKA inhibitor H-89, while the inhibitory effect of Cil was strongly attenuated by the PKG inhibitor KT 5823. Application of Ro in single bladder smooth myocytes resulted in an increase in Ca(2+) spark frequency but a decrease both in Ca(2+) transients and in sarcoplasmic reticulum (SR) Ca(2+) content. In contrast, Cil had no effect on these events. Furthermore, Ro-induced inhibition of the phasic contractions was significantly blocked by ryanodine and iberiotoxin. Taken together, PDE3 and PDE4 are the main PDE isoforms in maintaining the phasic contractions of bladder smooth myocytes, with PDE4 being functionally more active than PDE3. However, their roles are mediated through different mechanisms.
Collapse
Affiliation(s)
- Kui Zhai
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China; Inserm UMR-S 769, LabEx LERMIT, F-92296 Châtenay-Malabry, France; Université Paris-Sud, Faculté de Pharmacie, F-92296 Châtenay-Malabry, France
| | - Yan Chang
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Bin Wei
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Qinghua Liu
- Institute for Medical Biology, College of Life Sciences, South-Central University for Nationalities, Wuhan, China
| | - Véronique Leblais
- Inserm UMR-S 769, LabEx LERMIT, F-92296 Châtenay-Malabry, France; Université Paris-Sud, Faculté de Pharmacie, F-92296 Châtenay-Malabry, France
| | - Rodolphe Fischmeister
- Inserm UMR-S 769, LabEx LERMIT, F-92296 Châtenay-Malabry, France; Université Paris-Sud, Faculté de Pharmacie, F-92296 Châtenay-Malabry, France.
| | - Guangju Ji
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.
| |
Collapse
|
4
|
cGMP-PDE3-cAMP signal pathway involved in the inhibitory effect of CNP on gastric motility in rat. ACTA ACUST UNITED AC 2012. [PMID: 23186653 DOI: 10.1016/j.regpep.2012.11.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
In the present study, we investigated the mechanism of C-type natriuretic peptide (CNP)-induced inhibitory effect on spontaneous contraction of gastric antral smooth muscle to clarify CNP-NPR-B/pGC-cGMP downstream signal transduction pathway using organ bath and ELISA methods in rat. CNP significantly reduced the amplitude of the spontaneous contraction and increased the contents of cGMP and cAMP in the gastric antral smooth muscle tissue. In the presence of IBMX, a non-selective phosphodiesterase (PDE) inhibitor, the inhibitory effect of CNP on spontaneous contraction was significantly suppressed; however, the production of cGMP but not cAMP was still increased by CNP. EHNA, a PDE2 inhibitor, did not affect both CNP-induced inhibition of the contraction and CNP-induced increase of cGMP and cAMP generations in gastric smooth muscle tissue, while milrinone, a PDE3 inhibitor, similar to IBMX, attenuated the CNP-induced inhibitory effect on spontaneous contraction and increased the content of cGMP but not cAMP. The results suggest that cGMP-PDE3-cAMP signal pathway is also involved in the CNP-induced inhibition of gastric motility in rat.
Collapse
|
5
|
Kim YC, Choi W, Yun HY, Sung R, Yoo RY, Park SM, Yun SJ, Kim MJ, Song YJ, Xu WX, Lee SJ. Nitric Oxide-mediated Relaxation by High K in Human Gastric Longitudinal Smooth Muscle. THE KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY : OFFICIAL JOURNAL OF THE KOREAN PHYSIOLOGICAL SOCIETY AND THE KOREAN SOCIETY OF PHARMACOLOGY 2011; 15:405-13. [PMID: 22359479 PMCID: PMC3282229 DOI: 10.4196/kjpp.2011.15.6.405] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Revised: 11/10/2011] [Accepted: 11/12/2011] [Indexed: 12/27/2022]
Abstract
This study was designed to elucidate high-K(+)induced response of circular and longitudinal smooth muscle from human gastric corpus using isometric contraction. Contraction from circular and longitudinal muscle stripes of gastric corpus greater curvature and lesser curvature were compared. Circular smooth muscle from corpus greater curvature showed high K(+) (50 mM)-induced tonic contraction. On the contrary, however, longitudinal smooth muscle strips showed high K(+) (50 mM)-induced sustained relaxation. To find out the reason for the discrepancy we tested several relaxation mechanisms. Protein kinase blockers like KT5720, PKA inhibitor, and KT5823, PKG inhibitor, did not affect high K(+)-induced relaxation. K(+) channel blockers like tetraethylammonium (TEA), apamin (APA), glibenclamide (Glib) and barium (Ba(2+)) also had no effect. However, N(G)-nitro-L-arginine (L-NNA) and 1H-(1,2,4) oxadiazolo (4,3-A) quinoxalin-1-one (ODQ), an inhibitor of soluble guanylate cyclase (sGC) and 4-AP (4-aminopyridine), voltage-dependent K(+) channel (K(V)) blocker, inhibited high K(+)-induced relaxation, hence reversing to tonic contraction. High K(+)-induced relaxation was observed in gastric corpus of human stomach, but only in the longitudinal muscles from greater curvature not lesser curvature. L-NNA, ODQ and K(V) channel blocker sensitive high K(+)-induced relaxation in longitudinal muscle of higher portion of corpus was also observed. These results suggest that longitudinal smooth muscle from greater curvature of gastric corpus produced high K(+)-induced relaxation which was activated by NO/sGC pathway and by K(V) channel dependent mechanism.
Collapse
Affiliation(s)
- Young Chul Kim
- Department of Physiology, Chungbuk National University, College of Medicine, Cheongju 361-763, Korea
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|