1
|
Xiao C, Sun Y, Huang H, Yue X, Song Z, David T, Xu S. Cellular communication among smooth muscle cells: The role of membrane potential via connexins. J Theor Biol 2024; 576:111627. [PMID: 37977477 DOI: 10.1016/j.jtbi.2023.111627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 09/16/2023] [Accepted: 09/25/2023] [Indexed: 11/19/2023]
Abstract
Communication via action potentials among neurons has been extensively studied. However, effective communication without action potentials is ubiquitous in biological systems, yet it has received much less attention in comparison. Multi-cellular communication among smooth muscles is crucial for regulating blood flow, for example. Understanding the mechanism of this non-action potential communication is critical in many cases, like synchronization of cellular activity, under normal and pathological conditions. In this paper, we employ a multi-scale asymptotic method to derive a macroscopic homogenized bidomain model from the microscopic electro-neutral (EN) model. This is achieved by considering different diffusion coefficients and incorporating nonlinear interface conditions. Subsequently, the homogenized macroscopic model is used to investigate communication in multi-cellular tissues. Our computational simulations reveal that the membrane potential of syncytia, formed by interconnected cells via connexins, plays a crucial role in propagating oscillations from one region to another, providing an effective means for fast cellular communication. Statement of Significance: In this study, we investigated cellular communication and ion transport in vascular smooth muscle cells, shedding light on their mechanisms under normal and abnormal conditions. Our research highlights the potential of mathematical models in understanding complex biological systems. We developed effective macroscale electro-neutral bi-domain ion transport models and examined their behavior in response to different stimuli. Our findings revealed the crucial role of connexinmediated membrane potential changes and demonstrated the effectiveness of cellular communication through syncytium membranes. Despite some limitations, our study provides valuable insights into these processes and emphasizes the importance of mathematical modeling in unraveling the complexities of cellular communication and ion transport.
Collapse
Affiliation(s)
- Chun Xiao
- School of Mathematics and Statistics, Lingnan Normal University, Zhanjiang, 524048, China.
| | - Yishui Sun
- Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge CB3 0WA, United Kingdom.
| | - Huaxiong Huang
- Research Center for Mathematics, Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, Guangdong, 519088, China; Guangdong Provincial Key Laboratory of Interdisciplinary Research and Application for Data Science, BNU-HKBU United International College, Zhuhai, Guangdong, 519088, China; Laboratory of Mathematics and Complex Systems, MOE, Beijing Normal University, 100875, Beijing, China; Department of Mathematics and Statistics York University, Toronto, ON, M3J 1P3, Canada.
| | - Xingye Yue
- School of Mathematical Sciences, Soochow University, Suzhou 215006, China.
| | - Zilong Song
- Math and Statistics Department, Utah State University, Old Main Hill, Logan , UT 84322, USA.
| | - Tim David
- Department of Mechanical Engineering, College of Engineering, University of Canterbury, Private Bag 4800, Christchurch, 8041, New Zealand.
| | - Shixin Xu
- Zu Chongzhi Center for Mathematics and Computational Sciences (CMCS), Duke Kunshan University, Kunshan, 215316, China.
| |
Collapse
|
2
|
Myosalpinx Contractions Are Essential for Egg Transport Along the Oviduct and Are Disrupted in Reproductive Tract Diseases. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1124:265-294. [DOI: 10.1007/978-981-13-5895-1_11] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
|
3
|
Johansson B, Jonsson O. Similarities between the Vascular Smooth Muscle Responses to Sudden Changes in External Potassium, Sodium and Chloride Ion Concentrations. ACTA ACUST UNITED AC 2014. [DOI: 10.1111/j.1365-201x.1968.tb10874.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
4
|
Weston AH, Geraghty A, Egner I, Edwards G. The vascular extracellular calcium-sensing receptor: an update. Acta Physiol (Oxf) 2011; 203:127-37. [PMID: 21199402 DOI: 10.1111/j.1748-1716.2010.02249.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The extracellular calcium-sensing receptor (CaR) was first described in the parathyroid gland. Recent studies have shown that the CaR is also expressed in blood vessels, especially in the endothelial and adventitial layers but its physiological function is still not clear. However, an understanding of its possible role(s) in the vasculature (perivascular-neurones, heart and blood vessels) is important because of the use of synthetic positive allosteric CaR modulators in hyperparathyroidism and the potential importance of negative modulators in the treatment of osteoporosis. In this review, the effects of CaR activation and inhibition are detailed and the possible role of the CaR as both an amplifier and attenuator of myo-endothelial coupling in the vasculature is described.
Collapse
Affiliation(s)
- A H Weston
- Faculty of Life Sciences, University of Manchester, UK
| | | | | | | |
Collapse
|
5
|
|
6
|
Holman ME, Hirst GDS. Junctional Transmission in Smooth Muscle and the Autonomic Nervous System. Compr Physiol 2011. [DOI: 10.1002/cphy.cp010112] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
7
|
Abstract
The first part of the contractile response of rabbit aorta to epinephrine is depressed by elevation of calcium concentration; the second is potentiated. These observations suggest that the rate-limiting factor for the former is membrane excitability (depressed by increased calcium), while that for the latter is the role that calcium plays in coupling membrane excitation with the development of tension by the contractile protein (a function that is augmented by increased calcium).
Collapse
|
8
|
Bentley GA. Potentiation of responses to noradrenaline and reversal of sympathetic nerve blockade in the guinea-pig vas deferens. BRITISH JOURNAL OF PHARMACOLOGY AND CHEMOTHERAPY 2009; 25:243-56. [PMID: 19108205 DOI: 10.1111/j.1476-5381.1965.tb01779.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
9
|
Bülbring E, Burnstock G. Membrane potential changes associated with tachyphylaxis and potentiation of the response to stimulating drugs in smooth muscle. BRITISH JOURNAL OF PHARMACOLOGY AND CHEMOTHERAPY 2009; 15:611-24. [PMID: 19108142 DOI: 10.1111/j.1476-5381.1960.tb00289.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Conditions which affect the response of smooth muscle to repeated application of stimulating drugs have been investigated. In guinea-pig taenia coli, tension changes were recorded simultaneously with membrane potential changes using the sucrose gap technique. Acetylcholine, histamine, and 5-hydroxytryptamine caused depolarization and, after removal of the drug, hyperpolarization which was followed by a sequence of damped oscillations of the membrane potential. The average rate of depolarization decreased in the order acetylcholine>histamine >5-hydroxytryptamine. The readiness with which tachyphylaxis occurred increased in the order acetylcholine<histamine<5-hydroxytryptamine. When a dose of a stimulating drug was repeated, the response obtained depended on the phase of the oscillatory potential changes during which it was applied. In general the effect was depressed during a phase of polarization and enhanced during a phase of depolarization. The degree of tachyphylaxis-or potentiation-depended not only on the direction in which the membrane potential changed at the moment of drug application, but also on the relation between the rate at which this potential change took place and the rate of depolarization caused by the drug. The results observed are consistent with the hypothesis that the fluctuating excitability and polarization of the smooth muscle membrane is brought about by periodical changes in the rate of active ion transport and other stabilizing processes in the cell membrane which depend on the rate of metabolic energy supply. The muscle was sensitized to acetylcholine and histamine by previous treatment with, or in the presence of, 5-hydroxytryptamine.
Collapse
|
10
|
Andersson KE. Effects of calcium and calcium antagonists on the excitation-contraction coupling in striated and smooth muscle. ACTA PHARMACOLOGICA ET TOXICOLOGICA 2009; 43 Suppl 1:5-14. [PMID: 371336 DOI: 10.1111/j.1600-0773.1978.tb03564.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
11
|
Bieger D, Mong K, Tabrizchi R. Anomalous response to potassium in vascular smooth muscle cells of human saphenous vein. ACTA ACUST UNITED AC 2006; 26:1-6. [PMID: 16371060 DOI: 10.1111/j.1474-8673.2005.00351.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
1.--We have examined the relationship between the resting membrane potential (E(m)) and the concentration of the external ions, K(+), Cl(-) and Ca(2+), as well as the effects of K(+) on active force generation in human saphenous veins. 2.--As measured with sharp glass microelectrodes, the E(m) of vascular muscle cells was -76.0 +/- 7.0 mV (mean +/- SD; n = 328). Raising the concentration of external potassium ([K(+)](e)) from 4.2 to 20, 40, 80, 120 or 150 mm produced an incremental depolarization, revealing a maximal slope factor of 15 mV per 10-fold increase. 3.--Oubain (1.0 microm) did not have any effect on E(m) (-79.0 +/- 8.0 mV; n = 80). Replacement of external Cl(-) with propionate resulted in significant (P < 0.05) depolarization (E(m): -65.5 +/- 7.5 mV; n = 40). In Cl(-)-free buffer containing 80 mm K(+), E(m) depolarized to -52.0 +/- 6.7 mV (n = 45) compared with -64.7 +/- 6.5 mV (n = 55) (P < 0.05) measured in buffer containing 80 mm [K(+)](e) and Cl(-) 138.7 mm. Removal of Ca(2+) did not significantly modify the depolarizing response to K(+) 80 mm: E(m), -68.2 +/- 4.9 mV (n = 42) vs.-64.7 +/- 6.5 mV (n = 55) in the presence of Ca(2+). 4.--Despite their small size, changes in E(m) correlated closely with force generation in buffer containing high K(+), approximately 3.62 mN force being generated per mV of change in E(m). 5.--These data demonstrate that, in human saphenous smooth muscle cells, (i) the magnitude of depolarization induced by raising [K(+)](e) deviates considerably from the theoretical values predicted by the Goldman-Hodgkin-Katz equations, (ii) Cl(-) appears to contribute to the maintenance of E(m), and (iii) electromechanical coupling has a low threshold.
Collapse
Affiliation(s)
- D Bieger
- Division of Basic Medical Sciences, Faculty of Medicine, Memorial University of Newfoundland, Health Sciences Centre, St John's, NL, Canada A1B 3V6
| | | | | |
Collapse
|
12
|
BULBRING E, BURNSTOCK G, HOLMAN ME. Excitation and conduction in the smooth muscle of the isolated taenia coli of the guinea-pig. J Physiol 2000; 142:420-37. [PMID: 13576445 PMCID: PMC1356753 DOI: 10.1113/jphysiol.1958.sp006027] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
13
|
BURNSTOCK G. The effects of acetylcholine on membrane potential, spike frequency, conduction velocity and excitability in the taenia coli of the guinea-pig. J Physiol 2000; 143:165-82. [PMID: 13576467 PMCID: PMC1356718 DOI: 10.1113/jphysiol.1958.sp006051] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
14
|
Abstract
The discovery was made in the 1940s that calcium is required for transmitter release at synapses, raising the question of the identity of the sensor molecule upon which this calcium acts. Subsequently it was shown in the 1960s that this calcium acts on the inside of the nerve terminal. The channels which mediate the influx of calcium ions into the nerve terminal were identified in the 1970s. This essay is concerned with tracing the development of the concept of a calcium sensor in nerve terminals and of recent work that identifies the sensor molecule as synaptotagmin.
Collapse
Affiliation(s)
- M R Bennett
- Department of Physiology, University of Sydney, NSW, Australia
| |
Collapse
|
15
|
Nasu T. Effect of treatment time on calcium antagonism by cadmium ions in a guinea-pig taenia coli. JOURNAL OF AUTONOMIC PHARMACOLOGY 1999; 19:131-7. [PMID: 10511468 DOI: 10.1046/j.1365-2680.1999.00119.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
1. When pretreated for 1 min, with Cd2+ at low concentrations (0.001-0.01 mM), there was a parallel rightward shift of Ca2+ concentration-curves in guinea-pig taenia coli in K+-depolarized Ca2+-free medium. However, when pretreated for 30 min, Cd2+ reduced the maximal Ca2+ response size. 2. The application of 0.01 mM Cd2+ for 1, 5 and 30 min in Ca2+-free, K+-medium reduced to the same degree the Ca uptake after addition of 3 mM Ca2+. The inhibitory action on the tension by Cd2+ however, became greater as the pretreatment time with Cd2+ increased. 3. Within 5 min of Cd2+ (0.01 mM) treatment, Cd2+ chiefly bound to the cell membrane, however, with a longer duration (30 min), Cd2+ entered the cytoplasm where EDTA could not reach. 4. Cd2+ above 0.0005 mM reduced dose-dependently the respiration of isolated mitochondria. 5. These results suggest that with short duration exposure (1-5 min) of taenia coli cells to Cd2+, the interference with Ca2+ entry through voltage-dependent Ca2+ channels is predominant but for longer exposure times, intracellular actions of Cd2+ contribute to its inhibitory effects.
Collapse
Affiliation(s)
- T Nasu
- Department of Veterinary Pharmacology, Faculty of Agriculture, Yamaguchi University, Japan
| |
Collapse
|
16
|
Stevens RJ, Publicover NG, Smith TK. Induction and organization of Ca2+ waves by enteric neural reflexes. Nature 1999; 399:62-6. [PMID: 10331390 DOI: 10.1038/19973] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The motility of the gastrointestinal tract consists of local, non-propulsive mixing (pendular or segmental) and propulsive (peristaltic) movements. It is generally considered that mixing movements are produced by intrinsic pacemakers which generate rhythmic contractions, and peristalsis by intrinsic excitatory and inhibitory neural reflex pathways, but the relationship between mixing and peristalsis is poorly understood. Peristalsis is compromised in mice lacking interstitial cells of Cajal, suggesting that these pacemaker cells may also be involved in neural reflexes. Here we show that mixing movements within longitudinal muscle result from spontaneously generated waves of elevated internal calcium concentration which originate from discrete locations (pacing sites), spread with anisotropic conduction velocities in al directions, and terminate by colliding with each other or with adjacent neurally suppressed regions. Excitatory neural reflexes control the spread of excitability by inducing new pacing sites and enhancing the overall frequency of pacing, whereas inhibitory reflexes suppress the ability of calcium waves to propagate. We provide evidence that the enteric nervous system organizes mixing movements to generate peristalsis, linking the neural regulation of pacemakers to both types of gut motility.
Collapse
Affiliation(s)
- R J Stevens
- Biomedical Engineering Program and Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno 89557, USA
| | | | | |
Collapse
|
17
|
Massett MP, Lewis SJ, Bates JN, Kregel KC. Modulation of temperature-induced tone by vasoconstrictor agents. J Appl Physiol (1985) 1999; 86:963-9. [PMID: 10066711 DOI: 10.1152/jappl.1999.86.3.963] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
One of the primary cardiovascular adjustments to hyperthermia is a sympathetically mediated increase in vascular resistance in the viscera. Nonneural factors such as a change in vascular tone or reactivity may also contribute to this response. Therefore, the aim of this study was to determine whether vascular smooth muscle tone is altered during heating to physiologically relevant temperatures >37 degrees C. Gradually increasing bath temperature from 37 degrees C (normothermia) to 43 degrees C (severe hyperthermia) produced graded contractions in vascular ring segments from rat mesenteric arteries and thoracic aortae. In untreated rings these contractions were relatively small, whereas hyperthermia elicited near-maximal increases in tension when rings were constricted with phenylephrine or KCl before heating. In phenylephrine-treated mesenteric arterial rings, the contractile responses to heating were markedly attenuated by the Ca2+ channel antagonists nifedipine and diltiazem. Diltiazem also blocked the contractile responses to heating in thoracic aortic rings. These results demonstrate that hyperthermia has a limited effect on tension generation in rat vascular smooth muscle in the absence of vascular tone. However, in the presence of agonist-induced tone, tension generation during heating is markedly enhanced and dependent on extracellular Ca2+. In conclusion, these data suggest that local regulation of vascular tone can contribute to the hemodynamic adjustments to hyperthermia.
Collapse
Affiliation(s)
- M P Massett
- Department of Exercise Science, The University of Iowa, Iowa City, Iowa 52242, USA
| | | | | | | |
Collapse
|
18
|
BULBRING E, KURIYAMA H. Effects of changes in the external sodium and calcium concentrations on spontaneous electrical activity in smooth muscle of guinea-pig taenia coli. J Physiol 1998; 166:29-58. [PMID: 14016765 PMCID: PMC1359360 DOI: 10.1113/jphysiol.1963.sp007089] [Citation(s) in RCA: 181] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
19
|
|
20
|
GILLESPIE JS. The electrical and mechanical responses of intestinal smooth muscle cells to stimulation of their extrinsic parasympathetic nerves. J Physiol 1998; 162:76-92. [PMID: 13898637 PMCID: PMC1359640 DOI: 10.1113/jphysiol.1962.sp006915] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
21
|
GOODFORD PJ, ING HR. The pharmacology of the ethanesulphonate anion. BRITISH JOURNAL OF PHARMACOLOGY AND CHEMOTHERAPY 1998; 14:358-63. [PMID: 13851043 PMCID: PMC1481732 DOI: 10.1111/j.1476-5381.1959.tb00257.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A method of preparing analytically pure sodium ethanesulphonate, C(2)H(5)SO(3)Na.H(2)O, in quantity is described. Physiological saline solutions were prepared in which a proportion of the sodium chloride normally present was replaced by an equimolar concentration of sodium ethanesulphonate. The effects of partial or total replacement of sodium chloride were examined upon a series of isolated organs, and the guinea-pig ileum preparation was found to be particularly sensitive to the change. Evidence is presented that these low-chloride solutions depolarized the cell membrane of smooth muscle, and that this effect might have been due to an alteration of the chloride ion potential.
Collapse
|
22
|
RODDIE IC. The transmembrane potential changes associated with smooth muscle activity in turtle arteries and veins. J Physiol 1998; 163:138-50. [PMID: 14493082 PMCID: PMC1359692 DOI: 10.1113/jphysiol.1962.sp006962] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
23
|
GOODFORD PJ, HERMANSEN K. Sodium and potassium movements in the unstriated muscle of the guinea-pig taenia coli. J Physiol 1998; 158:426-48. [PMID: 13900276 PMCID: PMC1359976 DOI: 10.1113/jphysiol.1961.sp006778] [Citation(s) in RCA: 112] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
24
|
CSAPO IA, KURIYAMA HA. Effects of ions and drugs on cell membrane activity and tension in the postpartum rat myometrium. J Physiol 1998; 165:575-92. [PMID: 14024103 PMCID: PMC1359327 DOI: 10.1113/jphysiol.1963.sp007081] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
25
|
BURNSTOCK G, HOLMAN ME. The transmission of excitation from autonomic nerve to smooth muscle. J Physiol 1998; 155:115-33. [PMID: 13689213 PMCID: PMC1359843 DOI: 10.1113/jphysiol.1961.sp006617] [Citation(s) in RCA: 244] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
26
|
BURNSTOCK G, HOLMAN ME. Spontaneous potential at sympathetic nerve endings in smooth muscle. J Physiol 1998; 160:446-60. [PMID: 13875001 PMCID: PMC1359556 DOI: 10.1113/jphysiol.1962.sp006858] [Citation(s) in RCA: 120] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
27
|
BULBRING E, KURIYAMA H. Effects of changes in ionic environment on the action of acetylcholine and adrenaline on the smooth muscle cells of guinea-pig taenia coli. J Physiol 1998; 166:59-74. [PMID: 14016764 PMCID: PMC1359361 DOI: 10.1113/jphysiol.1963.sp007090] [Citation(s) in RCA: 94] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
28
|
|
29
|
|
30
|
|
31
|
|
32
|
KURIYAMA H. The influence of potassium, sodium and chloride on the membrane potential of the smooth muscle of taenia coli. J Physiol 1998; 166:15-28. [PMID: 13927501 PMCID: PMC1359359 DOI: 10.1113/jphysiol.1963.sp007088] [Citation(s) in RCA: 96] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
33
|
|
34
|
Nasu T, Shibata A, Shibata H. Effects of nifedipine on contraction by Mn2+ in Ca2+-free, high-K+ medium in ileal longitudinal muscle. GENERAL PHARMACOLOGY 1998; 31:287-90. [PMID: 9688474 DOI: 10.1016/s0306-3623(97)00438-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
1. The tension development due to 5 mM Mn2+ in Ca2+-free medium was dependent on the external K+ concentration above 35 mM in ileal muscle. 2. Nifedipine, an L-type Ca2+ channel blocker, dose dependently inhibited both the contraction and the manganese uptake by the application of 5 mM Mn2+ in the Ca2+-free, 35-60 mM K+ medium. 3. These results suggest that Mn2+ is entering through voltage-dependent Ca2+ channels depending on ileal membrane depolarization, and it directly activates the contractile protein.
Collapse
Affiliation(s)
- T Nasu
- Department of Veterinary Pharmacology, Faculty of Agriculture, Yamaguchi University, Japan.
| | | | | |
Collapse
|
35
|
Bukoski RD, Bian K, Wang Y, Mupanomunda M. Perivascular sensory nerve Ca2+ receptor and Ca2+-induced relaxation of isolated arteries. Hypertension 1997; 30:1431-9. [PMID: 9403564 DOI: 10.1161/01.hyp.30.6.1431] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The present study tested two hypotheses: (1) that a receptor for extracellular Ca2+ (Ca2+ receptor [CaR]) is located in the perivascular sensory nerve system and (2) that activation of this receptor by physiological concentrations of extracellular Ca2+ results in the release of vasodilator substance that mediates Ca2+-induced relaxation. Reverse transcription-polymerase chain reaction using primers derived from rat kidney CaR cDNA sequence showed that mRNA encoding a CaR is present in dorsal root ganglia but not the mesenteric resistance artery. Western blot analysis using monoclonal anti-CaR showed that a 140-kD protein that comigrates with the parathyroid CaR is present in both the dorsal root ganglia and intact mesenteric resistance artery. Immunocytochemical analysis of whole mount preparations of mesenteric resistance arteries showed that the anti-CaR-stained perivascular nerves restricted to the adventitial layer. Biophysical analysis of mesenteric resistance arteries showed that cumulatively raising Ca2+ from 1 to 1.25 mol/L and above relaxes precontracted arteries with an ED50 value of 2.47+/-0.17 mmol/L (n=12). The relaxation is endothelium independent and is unaffected by blockade of nitric oxide synthase but is completely antagonized by acute and subacute phenolic destruction of perivascular nerves. A bioassay showed further that superfusion of Ca2+ across the adventitial surface of resistance arteries releases a diffusible vasodilator substance. Pharmacological analysis indicates that the relaxing substance is not a common sensory nerve peptide transmitter but is a phospholipase A2/cytochrome P450-derived hyperpolarizing factor that we have classified as nerve-derived hyperpolarizing factor. These data demonstrate that a CaR is expressed in the perivascular nerve network, show that raising Ca2+ from 1 to 1.25 mol/L and above causes nerve-dependent relaxation of resistance arteries, and suggest that activation of the CaR induces the release of a diffusible hyperpolarizing vasodilator. We propose that this system could serve as a molecular link between whole-animal Ca2+ balance and arterial tone.
Collapse
MESH Headings
- Amino Acid Sequence
- Animals
- Benzamides/pharmacology
- Calcium/pharmacology
- Calcium-Binding Proteins/biosynthesis
- Calcium-Binding Proteins/chemistry
- Calcium-Binding Proteins/physiology
- Endothelium, Vascular/physiology
- Enzyme Inhibitors/pharmacology
- Ganglia, Spinal/metabolism
- In Vitro Techniques
- Kidney/metabolism
- Male
- Mesenteric Arteries/drug effects
- Mesenteric Arteries/innervation
- Mesenteric Arteries/physiology
- Molecular Sequence Data
- Muscle Denervation
- Muscle Relaxation/drug effects
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/innervation
- Muscle, Smooth, Vascular/physiology
- Neurons, Afferent/physiology
- Nitric Oxide Synthase/antagonists & inhibitors
- Piperidines/pharmacology
- Quinuclidines/pharmacology
- RNA, Messenger/biosynthesis
- Rats
- Rats, Wistar
- Substance P/analogs & derivatives
- Substance P/pharmacology
- Vascular Resistance/drug effects
- Vasodilation/drug effects
Collapse
Affiliation(s)
- R D Bukoski
- Department of Internal Medicine, University of Texas Medical Branch, Galveston Island 77555-1065, USA.
| | | | | | | |
Collapse
|
36
|
KURIYAMA H, TOMITA T. THE RESPONSES OF SINGLE SMOOTH MUSCLE CELLS OF GUINEA-PIG TAENIA COLI TO INTRACELLULARLY APPLIED CURRENTS, AND THEIR EFFECT ON THE SPONTANEOUS ELECTRICAL ACTIVITY. J Physiol 1996; 178:270-89. [PMID: 14298119 PMCID: PMC1357290 DOI: 10.1113/jphysiol.1965.sp007627] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
37
|
CASTEELS R, KURIYAMA H. MEMBRANE POTENTIAL AND IONIC CONTENT IN PREGNANT AND NON-PREGNANT RAT MYOMETRIUM. J Physiol 1996; 177:263-87. [PMID: 14302154 PMCID: PMC1357244 DOI: 10.1113/jphysiol.1965.sp007591] [Citation(s) in RCA: 112] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
38
|
BAUER H, GOODFORD PJ, HUETER J. THE CALCIUM CONTENT AND 45-CALCIUM UPTAKE OF THE SMOOTH MUSCLE OF THE GUINEA-PIG TAENIA COLI. J Physiol 1996; 176:163-79. [PMID: 14286347 PMCID: PMC1357186 DOI: 10.1113/jphysiol.1965.sp007542] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
39
|
SU C, BEVAN JA, URSILLO RC. ELECTRICAL QUIESCENCE OF PULMONARY ARTERY SMOOTH MUSCLE DURING SYMPATHOMIMETIC STIMULATION. Circ Res 1996; 15:26-7. [PMID: 14196203 DOI: 10.1161/01.res.15.1.20] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
40
|
KURIYAMA H. EFFECT OF CALCIUM AND MAGNESIUM ON NEUROMUSCULAR TRANSMISSION IN THE HYPOGASTRIC NERVE-VAS DEFERENS PREPARATION OF THE GUINEA-PIG. J Physiol 1996; 175:211-30. [PMID: 14241164 PMCID: PMC1357114 DOI: 10.1113/jphysiol.1964.sp007513] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
|
41
|
DELCASTILLO J, DEMELLO WC, MORALES T. INFLUENCE OF SOME IONS ON THE MEMBRANE POTENTIAL OF ASCARIS MUSCLE. ACTA ACUST UNITED AC 1996; 48:129-40. [PMID: 14212144 PMCID: PMC2195406 DOI: 10.1085/jgp.48.1.129] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The influence of several ions on the membrane potential of the somatic muscle of Ascaris has been investigated by changing their concentration in the surrounding solution. When [K](o) is increased at the expense of [Na](o) leaving [Cl](o) constant, the membrane potential is first seen to increase. [K](o) higher than 45 mM reduces the membrane potential with a slope of 23 mv for a tenfold change in [K](o). However, when [K](o) is increased keeping [Na](o) and [Cl](o) low and constant, the line relating the membrane potential with log [K](o) has a slope of almost 50 mv. If [Cl](o) is reduced in the absence of external Na, after the [K](o) is increased to 45 mM, the membrane potential decreases with a slope of 59 mv per tenfold change in [Cl](o) in close agreement with the Nernst equation. If Cl(-) is replaced by SO(4) (2-), a depolarization is produced, while chloride replacement by NO(3) (-), Br(-), and I(-) results in a hyperpolarization of the membrane. Removal of the external Na(+) ions increases the average membrane potential by 17 mv.
Collapse
|
42
|
Garcia X, Alcantara-Sarabia G, Cartas-Heredia L, Gijon E. Actions of perezone on rat smooth muscle. GENERAL PHARMACOLOGY 1995; 26:1741-5. [PMID: 8745164 DOI: 10.1016/0306-3623(95)00074-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
1. Perezone (PZN) on the in vitro intestinal smooth muscle of the rat relaxes the basal tonus of the smooth muscle, interrupts spontaneous activity and also blocks the contractile response induced by ACh, K+, and Ba2+; these actions are dose dependent. 2. Although in presence of small doses of PZN, the isometric contractile response to ACh was increased. 3. In calcium free intestinal smooth muscle preparation, the addition of PZN in low dose before Ca2+ increased the contractile effect of added calcium to the bath, but in presence of high doses of PZN the response to calcium was depressed. 4. PZN in calcium free preparations antagonized the contraction caused by adding barium. 5. These findings suggested that with small doses of PZN more availability of intracellular calcium free exist and/or an increase in excitability and/or an inhibition of AChase could coexist. 6. The responses of the intestine to high doses of PZN were possibly in part by blocking calcium entry. 7. The smooth muscle responses to PZN suggest that it has a membranal effect and/or an action on the internal calcium stores possibly increasing the intracellular calcium concentration. It is likely to be the expression of an increase in the intracellular calcium concentration above the levels normally reached that would be responsible for uncoupling of the smooth muscle, which would occur if the [Ca2+]i rises excessively.
Collapse
Affiliation(s)
- X Garcia
- Department of Physiology, School of Medicine, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, Mexico
| | | | | | | |
Collapse
|
43
|
Abstract
1. Manganese ions (Mn2+) have been used in the last few decades as one of a number of inorganic Ca2+ channel blockers to investigate Ca2+ channels in excitable smooth muscle cells. 2. It has been recently reported that in addition to its inhibitory effects on the Ca2+ channels, Mn2+ in millimolar concentrations also produces contraction in the state of cell membrane depolarization. 3. Mn2+ has been shown to be able to permeate the cells via voltage-operated L-type Ca2+ channels in the membranes and directly activates contractile proteins in smooth muscles. 4. Intracellular sites of action have been proposed for Mn2+ in smooth muscles.
Collapse
Affiliation(s)
- T Nasu
- Department of Veterinary Pharmacology, Faculty of Agriculture, Yamaguchi University, Japan
| |
Collapse
|
44
|
Nasu T, Murase H, Shibata H. Manganese ions induce tonic contraction after relaxation in a high-K+ medium in ileal longitudinal smooth muscle of guinea-pig. J Pharm Pharmacol 1994; 46:735-9. [PMID: 7837042 DOI: 10.1111/j.2042-7158.1994.tb03893.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
In ileal longitudinal muscle 5 mM Mn2+ inhibited completely the K+ (60 mM)-induced tonic tension to the base line; however, the tension progressively increased to above the level of original tonic response evoked by K+ after 3 h in the presence of Mn2+. Tetrodotoxin 5 x 10(-5) M) had no influence on the tension development in the presence of Mn2+ in the high-K+ medium. Mn2+ also increased the tension in a high-K+, Ca(2+)-free medium. The Ca2+ antagonist, gallopamil (10(-6) M) inhibited the development of tension in the presence of Mn2+ in the high-K+ medium. The 45Ca uptake determined by the lanthanum method remained unchanged from control levels after 3 h of the 5 mM Mn2+ application in the high-K+ medium in spite of the development of the tension. The manganese uptake in the high-K+ medium, increased in accordance with the increase of duration of 5 mM Mn2+ application. Gallopamil inhibited manganese uptake in the high-K+ medium. These results suggest that Mn2+ firstly reduces K(+)-induced tension by inhibition of Ca2+ influx, subsequently, Mn2+ ions accumulate in the intracellular compartments through voltage-operated Ca2+ channels and may activate contractile proteins in the ileal muscle.
Collapse
Affiliation(s)
- T Nasu
- Department of Veterinary Pharmacology, Faculty of Agriculture, Yamaguchi University, Japan
| | | | | |
Collapse
|
45
|
Abstract
1. Segments of bovine mesenteric lymphatic of varying diameter taken from different parts of the lymphatic tree were cut to 20 mm in length and set up so that measurements could be made of spontaneous isometric contractions. 2. There was considerable variability in frequency of spontaneous contractions but this was independent of resting tension. There was no significant correlation between lymphatic diameter and inherent frequency of contraction. 3. Isolated segments of bovine mesenteric lymphatic 70-80 mm in length were cannulated and set up in a three-compartment organ bath which allowed independent temperature control in each compartment. Pressure was recorded at inflow and outflow ends and experiments were video recorded. 4. Contractile activity was normally initiated at the end of the lymphatic maintained at the higher temperature and the contractile wave was propagated along the length of the vessel. 5. Propagation could occur either in the direction of valve orientation (orthograde) or retrogradely. The volume of fluid pumped was not significantly affected by the direction of propagation. 6. Perfusion of the central compartment with Krebs solution at 0-2 degrees C disrupted normal propagation and allowed the two parts of the lymphatic to contract at different frequencies although the two parts maintained an approximately 2:1 ratio. 7. Perfusion of the central compartment with 10 mM-heptanol also disrupted normal propagation but the rates on either side of the partition bore no harmonic relationship to one another. 8. These results suggest that relatively short segments of lymph duct have the ability to contract spontaneously and that their inherent frequencies are not determined by their position in the lymphatic tree. The results are consistent with the existence of electrical coupling along the lymphatic's length and they suggest that over distances of at least 80 mm independent pacemakers are capable of mutual entrainment at a frequency representing a compromise between the fastest and slowest components.
Collapse
Affiliation(s)
- N G McHale
- School of Biomedical Science, Queen's University of Belfast
| | | |
Collapse
|
46
|
|
47
|
Affiliation(s)
- D F Bohr
- Department of Physiology, University of Michigan, Ann Arbor 48109-0622
| |
Collapse
|
48
|
Hoyle CH. A modified single sucrose gap. Junction potentials and electrotonic potentials in gastrointestinal smooth muscles. JOURNAL OF PHARMACOLOGICAL METHODS 1987; 18:219-26. [PMID: 3682842 DOI: 10.1016/0160-5402(87)90072-6] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Modifications were made to a rubber membrane type of single sucrose gap apparatus, which facilitated recording of isometric tension in smooth muscle preparations and which allowed electrotonic potentials and junction potentials to be evoked simultaneously. Nonadrenergic, noncholinergic inhibitory junction potentials were recorded from the circular muscle of the rat cecum. The amplitude of the inhibitory junction potential was linearly dependent on membrane potential, and inhibitory junction potential reversal potential was consonant with the expected potassium equilibrium potential. Cholinergic excitatory junction potentials were recorded in a preparation of the guinea pig cecum. It has been discussed as to how this type of modified single sucrose gap will be useful for pharmacological investigations into neuromuscular transmission, in addition to being a useful technique for examining actions of drugs and chemicals on smooth muscles.
Collapse
Affiliation(s)
- C H Hoyle
- Department of Anatomy and Embryology, University College London, United Kingdom
| |
Collapse
|
49
|
Lim SP, Muir TC. Mechanisms underlying the electrical and mechanical responses of the guinea-pig internal anal sphincter to field stimulation and to drugs. Br J Pharmacol 1985; 86:427-37. [PMID: 3931733 PMCID: PMC1916682 DOI: 10.1111/j.1476-5381.1985.tb08912.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The electrical membrane characteristics and the response of the circular muscle of the guinea-pig internal anal sphincter (i.a.s.) to field stimulation were studied in vitro using intracellular microelectrodes and conventional mechanical recording techniques. The i.a.s. developed its own tone (3-4 g), following initial stretch (1 g) and spontaneous spike potentials were evident. In the absence of spike potentials, tone declined and disappeared. Tone was not significantly reduced by phentolamine (1 X 10(-6)M). The resting membrane potential, measured between spontaneous spike potentials, was -45 +/- 3.0 mV (n = 224); the space constant (lambda) was 1.13 +/- 0.1 mm (n = 13). Spikes usually overshot by approximately 15 mV. The frequency of spike potential discharge (1-3 Hz) varied with the degree of membrane depolarization, being increased in K+-rich and decreased in K+-deficient solutions or by the presence of Mn2+. It was not significantly affected by C1-withdrawal but was increased in Na+-deficient solutions with or without tetrodotoxin (TTX; 1 X 10(-6)M). Field stimulation (1-20 Hz, 0.5 ms, supramaximal voltage) produced inhibitory junction potentials (i.j.ps) and relaxed tone; at high frequencies (50 Hz or greater), contractions were observed but excitatory junction potentials (e.j.ps) were not. I.j.ps and relaxations were inhibited by apamin (1 X 10(-6)M), TTX (1 X 10(-6)M) but not by atropine (1 X 10(-6)M), phentolamine (1 X 10(-6)M) or hexamethonium (1 X 10(-6)M). I.j.ps were reduced by hyperpolarization and enhanced by depolarization of the membrane by current pulses (15s). The mean equilibrium potential for the i.j.p. was -94 mV (correlation coefficient, gamma = 0.71, n = 5, p less than 0.001). I.j.ps were enhanced in K+-deficient solutions and reduced in K+-rich solutions. Together these results suggest that the i.j.p. is mediated by an increased GK. The absence of [Ca2+]o or the presence of Mn2+ (2 mM) abolished the i.j.p.; in contrast Na+-deficient or C1-free solutions were ineffective in this respect. Tetraethylammonium (5-50mM) abolished the i.j.p.; the accompanying relaxation was reduced by about 80%. The major aspect of the relaxation to nerve stimulation is mediated by membrane hyperpolarization.
Collapse
|
50
|
|