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Davis MJ, Earley S, Li YS, Chien S. Vascular mechanotransduction. Physiol Rev 2023; 103:1247-1421. [PMID: 36603156 PMCID: PMC9942936 DOI: 10.1152/physrev.00053.2021] [Citation(s) in RCA: 43] [Impact Index Per Article: 43.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 09/26/2022] [Accepted: 10/04/2022] [Indexed: 01/07/2023] Open
Abstract
This review aims to survey the current state of mechanotransduction in vascular smooth muscle cells (VSMCs) and endothelial cells (ECs), including their sensing of mechanical stimuli and transduction of mechanical signals that result in the acute functional modulation and longer-term transcriptomic and epigenetic regulation of blood vessels. The mechanosensors discussed include ion channels, plasma membrane-associated structures and receptors, and junction proteins. The mechanosignaling pathways presented include the cytoskeleton, integrins, extracellular matrix, and intracellular signaling molecules. These are followed by discussions on mechanical regulation of transcriptome and epigenetics, relevance of mechanotransduction to health and disease, and interactions between VSMCs and ECs. Throughout this review, we offer suggestions for specific topics that require further understanding. In the closing section on conclusions and perspectives, we summarize what is known and point out the need to treat the vasculature as a system, including not only VSMCs and ECs but also the extracellular matrix and other types of cells such as resident macrophages and pericytes, so that we can fully understand the physiology and pathophysiology of the blood vessel as a whole, thus enhancing the comprehension, diagnosis, treatment, and prevention of vascular diseases.
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Affiliation(s)
- Michael J Davis
- Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, Missouri
| | - Scott Earley
- Department of Pharmacology, University of Nevada, Reno, Nevada
| | - Yi-Shuan Li
- Department of Bioengineering, University of California, San Diego, California
- Institute of Engineering in Medicine, University of California, San Diego, California
| | - Shu Chien
- Department of Bioengineering, University of California, San Diego, California
- Institute of Engineering in Medicine, University of California, San Diego, California
- Department of Medicine, University of California, San Diego, California
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2
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Yu W, MacIver B, Zhang L, Bien EM, Ahmed N, Chen H, Hanif SZ, de Oliveira MG, Zeidel ML, Hill WG. Deletion of Mechanosensory β1-integrin From Bladder Smooth Muscle Results in Voiding Dysfunction and Tissue Remodeling. FUNCTION 2022. [DOI: 10.1093/function/zqac042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
The bladder undergoes large shape changes as it fills and empties and experiences complex mechanical forces. These forces become abnormal in diseases of the lower urinary tract such as overactive bladder, neurogenic bladder, and urinary retention. As the primary mechanosensors linking the actin cytoskeleton to the extracellular matrix (ECM), integrins are likely to play vital roles in maintaining bladder smooth muscle (BSM) homeostasis. In a tamoxifen-inducible smooth muscle conditional knockout of β1-integrin, there was concomitant loss of α1- and α3-integrins from BSM and upregulation of αV- and β3-integrins. Masson's staining showed a reduction in smooth muscle with an increase in collagenous ECM. Functionally, mice exhibited a changing pattern of urination by voiding spot assay up to 8 wk after tamoxifen. By 8 wk, there was increased frequency with reductions in voided volume, consistent with overactivity. Cystometrograms confirmed that there was a significant reduction in intercontractile interval with reduced maximal bladder pressure. Muscle strip myography revealed a loss of contraction force in response to electrical field stimulation, that was entirely due to the loss of muscarinic contractility. Quantitative western blotting showed a loss of M3 receptor and no change in P2X1. qPCR on ECM and interstitial genes revealed loss of Ntpd2, a marker of an interstitial cell subpopulation; and an upregulation of S100A4, which is often associated with fibroblasts. Collectively, the data show that the loss of appropriate mechanosensation through integrins results in cellular and extracellular remodeling, and concomitant bladder dysfunction that resembles lower urinary tract symptoms seen in older people.
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Affiliation(s)
- Weiqun Yu
- Laboratory of Voiding Dysfunction, Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School , Boston, MA 02215, USA
| | - Bryce MacIver
- Laboratory of Voiding Dysfunction, Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School , Boston, MA 02215, USA
| | - Lanlan Zhang
- Laboratory of Voiding Dysfunction, Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School , Boston, MA 02215, USA
| | - Erica M Bien
- Laboratory of Voiding Dysfunction, Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School , Boston, MA 02215, USA
| | - Nazaakat Ahmed
- Laboratory of Voiding Dysfunction, Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School , Boston, MA 02215, USA
| | - Huan Chen
- Laboratory of Voiding Dysfunction, Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School , Boston, MA 02215, USA
| | - Sarah Z Hanif
- Laboratory of Voiding Dysfunction, Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School , Boston, MA 02215, USA
| | - Mariana G de Oliveira
- Department of Pharmacology, Faculty of Medical Sciences, University of Campinas (UNICAMP) , Campinas, SP 13083-970, Brazil
| | - Mark L Zeidel
- Laboratory of Voiding Dysfunction, Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School , Boston, MA 02215, USA
| | - Warren G Hill
- Laboratory of Voiding Dysfunction, Nephrology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School , Boston, MA 02215, USA
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Zhang L, Au-Yeung CL, Huang C, Yeung TL, Ferri-Borgogno S, Lawson BC, Kwan SY, Yin Z, Wong ST, Thomas V, Lu KH, Yip KP, Sham JSK, Mok SC. Ryanodine receptor 1-mediated Ca2+ signaling and mitochondrial reprogramming modulate uterine serous cancer malignant phenotypes. J Exp Clin Cancer Res 2022; 41:242. [PMID: 35953818 PMCID: PMC9373370 DOI: 10.1186/s13046-022-02419-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 06/13/2022] [Indexed: 11/24/2022] Open
Abstract
Background Uterine serous cancer (USC) is the most common non-endometrioid subtype of uterine cancer, and is also the most aggressive. Most patients will die of progressively chemotherapy-resistant disease, and the development of new therapies that can target USC remains a major unmet clinical need. This study sought to determine the molecular mechanism by which a novel unfavorable prognostic biomarker ryanodine receptor 1 (RYR1) identified in advanced USC confers their malignant phenotypes, and demonstrated the efficacy of targeting RYR1 by repositioned FDA-approved compounds in USC treatment. Methods TCGA USC dataset was analyzed to identify top genes that are associated with patient survival or disease stage, and can be targeted by FDA-approved compounds. The top gene RYR1 was selected and the functional role of RYR1 in USC progression was determined by silencing and over-expressing RYR1 in USC cells in vitro and in vivo. The molecular mechanism and signaling networks associated with the functional role of RYR1 in USC progression were determined by reverse phase protein arrays (RPPA), Western blot, and transcriptomic profiling analyses. The efficacy of the repositioned compound dantrolene on USC progression was determined using both in vitro and in vivo models. Results High expression level of RYR1 in the tumors is associated with advanced stage of the disease. Inhibition of RYR1 suppressed proliferation, migration and enhanced apoptosis through Ca2+-dependent activation of AKT/CREB/PGC-1α and AKT/HK1/2 signaling pathways, which modulate mitochondrial bioenergetics properties, including oxidative phosphorylation, ATP production, mitochondrial membrane potential, ROS production and TCA metabolites, and glycolytic activities in USC cells. Repositioned compound dantrolene suppressed USC progression and survival in mouse models. Conclusions These findings provided insight into the mechanism by which RYR1 modulates the malignant phenotypes of USC and could aid in the development of dantrolene as a repurposed therapeutic agent for the treatment of USC to improve patient survival. Supplementary Information The online version contains supplementary material available at 10.1186/s13046-022-02419-w.
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Edwards A, Kurtcuoglu V. Renal blood flow and oxygenation. Pflugers Arch 2022; 474:759-770. [PMID: 35438336 PMCID: PMC9338895 DOI: 10.1007/s00424-022-02690-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 03/19/2022] [Accepted: 03/21/2022] [Indexed: 02/07/2023]
Abstract
Our kidneys receive about one-fifth of the cardiac output at rest and have a low oxygen extraction ratio, but may sustain, under some conditions, hypoxic injuries that might lead to chronic kidney disease. This is due to large regional variations in renal blood flow and oxygenation, which are the prerequisite for some and the consequence of other kidney functions. The concurrent operation of these functions is reliant on a multitude of neuro-hormonal signaling cascades and feedback loops that also include the regulation of renal blood flow and tissue oxygenation. Starting with open questions on regulatory processes and disease mechanisms, we review herein the literature on renal blood flow and oxygenation. We assess the current understanding of renal blood flow regulation, reasons for disparities in oxygen delivery and consumption, and the consequences of disbalance between O2 delivery, consumption, and removal. We further consider methods for measuring and computing blood velocity, flow rate, oxygen partial pressure, and related parameters and point out how limitations of these methods constitute important hurdles in this area of research. We conclude that to obtain an integrated understanding of the relation between renal function and renal blood flow and oxygenation, combined experimental and computational modeling studies will be needed.
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Affiliation(s)
- Aurelie Edwards
- Department of Biomedical Engineering, Boston University, 44 Cummington Mall, Boston, MA, 02215, USA
| | - Vartan Kurtcuoglu
- Institute of Physiology, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland. .,National Center of Competence in Research, Kidney.CH, University of Zurich, Zurich, Switzerland. .,Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland.
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Liu S, Lin Z. Vascular Smooth Muscle Cells Mechanosensitive Regulators and Vascular Remodeling. J Vasc Res 2021; 59:90-113. [PMID: 34937033 DOI: 10.1159/000519845] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 09/23/2021] [Indexed: 11/19/2022] Open
Abstract
Blood vessels are subjected to mechanical loads of pressure and flow, inducing smooth muscle circumferential and endothelial shear stresses. The perception and response of vascular tissue and living cells to these stresses and the microenvironment they are exposed to are critical to their function and survival. These mechanical stimuli not only cause morphological changes in cells and vessel walls but also can interfere with biochemical homeostasis, leading to vascular remodeling and dysfunction. However, the mechanisms underlying how these stimuli affect tissue and cellular function, including mechanical stimulation-induced biochemical signaling and mechanical transduction that relies on cytoskeletal integrity, are unclear. This review focuses on signaling pathways that regulate multiple biochemical processes in vascular mesangial smooth muscle cells in response to circumferential stress and are involved in mechanosensitive regulatory molecules in response to mechanotransduction, including ion channels, membrane receptors, integrins, cytoskeletal proteins, nuclear structures, and cascades. Mechanoactivation of these signaling pathways is closely associated with vascular remodeling in physiological or pathophysiological states.
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Affiliation(s)
- Shangmin Liu
- Ji Hua Institute of Biomedical Engineering Technology, Ji Hua Laboratory, Foshan, China, .,Medical Research Center, Guangdong Academy of Medical Sciences, Guangdong General Hospital, Guangzhou, China,
| | - Zhanyi Lin
- Ji Hua Institute of Biomedical Engineering Technology, Ji Hua Laboratory, Foshan, China.,Institute of Geriatric Medicine, Guangdong Academy of Medical Sciences, Guangdong General Hospital, Guangzhou, China
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Jackson WF. Calcium-Dependent Ion Channels and the Regulation of Arteriolar Myogenic Tone. Front Physiol 2021; 12:770450. [PMID: 34819877 PMCID: PMC8607693 DOI: 10.3389/fphys.2021.770450] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Accepted: 10/11/2021] [Indexed: 11/25/2022] Open
Abstract
Arterioles in the peripheral microcirculation regulate blood flow to and within tissues and organs, control capillary blood pressure and microvascular fluid exchange, govern peripheral vascular resistance, and contribute to the regulation of blood pressure. These important microvessels display pressure-dependent myogenic tone, the steady state level of contractile activity of vascular smooth muscle cells (VSMCs) that sets resting arteriolar internal diameter such that arterioles can both dilate and constrict to meet the blood flow and pressure needs of the tissues and organs that they perfuse. This perspective will focus on the Ca2+-dependent ion channels in the plasma and endoplasmic reticulum membranes of arteriolar VSMCs and endothelial cells (ECs) that regulate arteriolar tone. In VSMCs, Ca2+-dependent negative feedback regulation of myogenic tone is mediated by Ca2+-activated K+ (BKCa) channels and also Ca2+-dependent inactivation of voltage-gated Ca2+ channels (VGCC). Transient receptor potential subfamily M, member 4 channels (TRPM4); Ca2+-activated Cl− channels (CaCCs; TMEM16A/ANO1), Ca2+-dependent inhibition of voltage-gated K+ (KV) and ATP-sensitive K+ (KATP) channels; and Ca2+-induced-Ca2+ release through inositol 1,4,5-trisphosphate receptors (IP3Rs) participate in Ca2+-dependent positive-feedback regulation of myogenic tone. Calcium release from VSMC ryanodine receptors (RyRs) provide negative-feedback through Ca2+-spark-mediated control of BKCa channel activity, or positive-feedback regulation in cooperation with IP3Rs or CaCCs. In some arterioles, VSMC RyRs are silent. In ECs, transient receptor potential vanilloid subfamily, member 4 (TRPV4) channels produce Ca2+ sparklets that activate IP3Rs and intermediate and small conductance Ca2+ activated K+ (IKCa and sKCa) channels causing membrane hyperpolarization that is conducted to overlying VSMCs producing endothelium-dependent hyperpolarization and vasodilation. Endothelial IP3Rs produce Ca2+ pulsars, Ca2+ wavelets, Ca2+ waves and increased global Ca2+ levels activating EC sKCa and IKCa channels and causing Ca2+-dependent production of endothelial vasodilator autacoids such as NO, prostaglandin I2 and epoxides of arachidonic acid that mediate negative-feedback regulation of myogenic tone. Thus, Ca2+-dependent ion channels importantly contribute to many aspects of the regulation of myogenic tone in arterioles in the microcirculation.
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Affiliation(s)
- William F Jackson
- Department of Pharmacology and Toxicology, College of Osteopathic Medicine, Michigan State University, East Lansing, MI, United States
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Drummond HA. What Evolutionary Evidence Implies About the Identity of the Mechanoelectrical Couplers in Vascular Smooth Muscle Cells. Physiology (Bethesda) 2021; 36:292-306. [PMID: 34431420 DOI: 10.1152/physiol.00008.2021] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Loss of pressure-induced vasoconstriction increases susceptibility to renal and cerebral vascular injury. Favored paradigms underlying initiation of the response include transient receptor potential channels coupled to G protein-coupled receptors or integrins as transducers. Degenerin channels may also mediate the response. This review addresses the 1) evolutionary role of these molecules in mechanosensing, 2) limitations to identifying mechanosensitive molecules, and 3) paradigm shifting molecular model for a VSMC mechanosensor.
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Affiliation(s)
- Heather A Drummond
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, Mississippi
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8
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Inchanalkar S, Balasubramanian N. Adhesion-growth factor crosstalk regulates AURKB activation and ERK signalling in re-adherent fibroblasts. J Biosci 2021. [DOI: 10.1007/s12038-021-00164-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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9
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Mengqi S, Wen S, Boxin Z, Minni L, Yan Z, Qun W, Yumei Z. Micro/nano topography with altered nanotube diameter differentially trigger endoplasmic reticulum stress to mediate bone mesenchymal stem cell osteogenic differentiation. Biomed Mater 2020; 16:015024. [PMID: 33036006 DOI: 10.1088/1748-605x/abbfee] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Micro/nano-topography (MNT) can promote osteogenic differentiation of stem cells, but the mechanism of topographical signaling transduction remains unclear. We have confirmed MNT, as a stressor, triggers endoplasmic reticulum (ER) stress and activates unfolded protein response in rat bone marrow mesenchymal stem cells, and such topography-induced ER stress promotes osteogenic differentiation. In order to reveal the influence of nanotube dimensions on ER stress, MNTs containing vertically oriented TiO2 nanotubes of diameters ranging from 30 nm to 100 nm were fabricated on pure titanium (Ti) foils, and ER stress and osteogenic differentiation of cells were systematically studied. After 12 h of cultivation, the transmission electron microscopy showed that cells on MNTs presented gross distortions of rough ER morphology containing the electron-dense material, and the expansion of the ER lumen became more pronounced as the dimension of nanotubes increased. Additionally, PCR and western blotting showed that the ER stress-related gene, the ER chaperone 78 kDa glucose-regulated protein, also known as binding-immunoglobulin protein (GRP78/BiP), was up-regulated, which was consistent with the osteogenesis-inducing ability of MNTs. Based on our previous studies, the findings in this article further revealed the mechanism for topographical cues modulating osteogenic differentiation of cells, which may provide an innovative approach for the optimal design of implant surface topography.
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Affiliation(s)
- Shi Mengqi
- Department of Stomatology, Navy Specialty Medical Center of Peoples' Liberation Army Navy, Shanghai 200052, People's Republic of China
- These authors contributed equally to this work
| | - Song Wen
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shanxi Key Laboratory of Oral Diseases, Department of Prosthodontics, School of Stomatology, the Fourth Military Medical University, Xi'an 710032, People's Republic of China
- These authors contributed equally to this work
| | - Zhang Boxin
- Department of Stomatology, Changzheng Hospital, the Second Military Medical University, Shanghai 200003, People's Republic of China
- These authors contributed equally to this work
| | - Liu Minni
- Department of Stomatology, Navy Specialty Medical Center of Peoples' Liberation Army Navy, Shanghai 200052, People's Republic of China
| | - Zhang Yan
- Department of Stomatology, Navy Specialty Medical Center of Peoples' Liberation Army Navy, Shanghai 200052, People's Republic of China
| | - Wu Qun
- Department of Stomatology, Navy Specialty Medical Center of Peoples' Liberation Army Navy, Shanghai 200052, People's Republic of China
| | - Zhang Yumei
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shanxi Key Laboratory of Oral Diseases, Department of Prosthodontics, School of Stomatology, the Fourth Military Medical University, Xi'an 710032, People's Republic of China
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10
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Chen J, Zhou Y, Liu S, Li C. Biomechanical signal communication in vascular smooth muscle cells. J Cell Commun Signal 2020; 14:357-376. [PMID: 32780323 DOI: 10.1007/s12079-020-00576-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 08/04/2020] [Indexed: 12/13/2022] Open
Abstract
Biomechanical stresses are closely associated with cardiovascular development and diseases. In vivo, vascular smooth muscle cells are constantly stimulated by biomechanical factors caused by increased blood pressure leading to the non-specific activation of cell transmembrane proteins. Thus, various intracellular signal molecules are simultaneously activated via signaling cascades, which are closely related to alterations in the differentiation, phenotype, inflammation, migration, pyroptosis, calcification, proliferation, and apoptosis of vascular smooth muscle cells. Meanwhile, mechanical stress-induced miRNAs and epigenetics modification on vascular smooth muscle cells play critical roles as well. Eventually, the overall pathophysiology of the cells is altered, resulting in the development of many major clinical diseases, including hypertension, atherosclerosis, grafted venous atherosclerosis, and aneurysm, among others. In this paper, important advances in mechanical signal communication in vascular smooth muscle cells are reviewed.
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Affiliation(s)
- Jingbo Chen
- Department of Histology and Embryology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Yan Zhou
- Department of Histology and Embryology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Shuying Liu
- Department of Histology and Embryology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China.
| | - Chaohong Li
- Department of Histology and Embryology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China.
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11
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Barabas P, Augustine J, Fernández JA, McGeown JG, McGahon MK, Curtis TM. Ion channels and myogenic activity in retinal arterioles. CURRENT TOPICS IN MEMBRANES 2020; 85:187-226. [PMID: 32402639 DOI: 10.1016/bs.ctm.2020.01.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Retinal pressure autoregulation is an important mechanism that protects the retina by stabilizing retinal blood flow during changes in arterial or intraocular pressure. Similar to other vascular beds, retinal pressure autoregulation is thought to be mediated largely through the myogenic response of small arteries and arterioles which constrict when transmural pressure increases or dilate when it decreases. Over recent years, we and others have investigated the signaling pathways underlying the myogenic response in retinal arterioles, with particular emphasis on the involvement of different ion channels expressed in the smooth muscle layer of these vessels. Here, we review and extend previous work on the expression and spatial distribution of the plasma membrane and sarcoplasmic reticulum ion channels present in retinal vascular smooth muscle cells (VSMCs) and discuss their contribution to pressure-induced myogenic tone in retinal arterioles. This includes new data demonstrating that several key players and modulators of the myogenic response show distinctively heterogeneous expression along the length of the retinal arteriolar network, suggesting differences in myogenic signaling between larger and smaller pre-capillary arterioles. Our immunohistochemical investigations have also highlighted the presence of actin-containing microstructures called myobridges that connect the retinal VSMCs to one another. Although further work is still needed, studies to date investigating myogenic mechanisms in the retina have contributed to a better understanding of how blood flow is regulated in this tissue. They also provide a basis to direct future research into retinal diseases where blood flow changes contribute to the pathology.
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Affiliation(s)
- Peter Barabas
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University of Belfast, Belfast, United Kingdom
| | - Josy Augustine
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University of Belfast, Belfast, United Kingdom
| | - José A Fernández
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University of Belfast, Belfast, United Kingdom
| | - J Graham McGeown
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University of Belfast, Belfast, United Kingdom
| | - Mary K McGahon
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University of Belfast, Belfast, United Kingdom
| | - Tim M Curtis
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University of Belfast, Belfast, United Kingdom.
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12
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Marsh DJ, Postnov DD, Sosnovtseva OV, Holstein-Rathlou NH. The nephron-arterial network and its interactions. Am J Physiol Renal Physiol 2019; 316:F769-F784. [DOI: 10.1152/ajprenal.00484.2018] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Tubuloglomerular feedback and the myogenic mechanism form an ensemble in renal afferent arterioles that regulate single-nephron blood flow and glomerular filtration. Each mechanism generates a self-sustained oscillation, the mechanisms interact, and the oscillations synchronize. The synchronization generates a bimodal electrical signal in the arteriolar wall that propagates retrograde to a vascular node, where it meets similar electrical signals from other nephrons. Each signal carries information about the time-dependent behavior of the regulatory ensemble. The converging signals support synchronization of the nephrons participating in the information exchange, and the synchronization can lead to formation of nephron clusters. We review the experimental evidence and the theoretical implications of these interactions and consider additional interactions that can limit the size of nephron clusters. The architecture of the arterial tree figures prominently in these interactions.
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Affiliation(s)
- Donald J. Marsh
- Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown University, Providence, Rhode Island
| | - Dmitry D. Postnov
- Neurophotonics Center, Boston University, Boston, Massachusetts
- Department of Biomedical Sciences, Panum Institute, University of Copenhagen, Copenhagen, Denmark
| | - Olga V. Sosnovtseva
- Department of Biomedical Sciences, Panum Institute, University of Copenhagen, Copenhagen, Denmark
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13
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Singh V, Erady C, Balasubramanian N. Cell-matrix adhesion controls Golgi organization and function through Arf1 activation in anchorage-dependent cells. J Cell Sci 2018; 131:jcs.215855. [PMID: 30054383 PMCID: PMC6127727 DOI: 10.1242/jcs.215855] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 06/27/2018] [Indexed: 12/15/2022] Open
Abstract
Cell-matrix adhesion regulates membrane trafficking controlling anchorage-dependent signaling. While a dynamic Golgi complex can contribute to this pathway, its regulation by adhesion remains unclear. Here we report that loss of adhesion dramatically disorganized the Golgi in mouse and human fibroblast cells. Golgi integrity is restored rapidly upon integrin-mediated re-adhesion to FN and is disrupted by integrin blocking antibody. In suspended cells, the cis, cis-medial and trans-Golgi networks differentially disorganize along the microtubule network but show no overlap with the ER, making this disorganization distinct from known Golgi fragmentation. This pathway is regulated by an adhesion-dependent reduction and recovery of Arf1 activation. Constitutively active Arf1 disrupts this regulation and prevents Golgi disorganization due to loss of adhesion. Adhesion-dependent Arf1 activation regulates its binding to the microtubule minus-end motor protein dynein to control Golgi reorganization, which is blocked by ciliobrevin. Adhesion-dependent Golgi organization controls its function, regulating cell surface glycosylation due to loss of adhesion, which is blocked by constitutively active Arf1. This study, hence, identified integrin-dependent cell-matrix adhesion to be a novel regulator of Arf1 activation, controlling Golgi organization and function in anchorage-dependent cells.
This article has an associated First Person interview with the first author of the paper. Summary: Integrin-dependent cell-matrix adhesion activates Arf1, which then recruits dynein to regulate Golgi organization and function along the microtubule network.
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Affiliation(s)
- Vibha Singh
- Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pune, Maharashtra 411008, India
| | - Chaitanya Erady
- Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pune, Maharashtra 411008, India
| | - Nagaraj Balasubramanian
- Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pune, Maharashtra 411008, India
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Yip KP, Balasubramanian L, Kan C, Wang L, Liu R, Ribeiro-Silva L, Sham JSK. Intraluminal pressure triggers myogenic response via activation of calcium spark and calcium-activated chloride channel in rat renal afferent arteriole. Am J Physiol Renal Physiol 2018; 315:F1592-F1600. [PMID: 30089032 DOI: 10.1152/ajprenal.00239.2018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Myogenic contraction of renal arterioles is an important regulatory mechanism for renal blood flow autoregulation. We have previously demonstrated that integrin-mediated mechanical force increases the occurrence of Ca2+ sparks in freshly isolated renal vascular smooth muscle cells (VSMCs). To further test whether the generation of Ca2+ sparks is a downstream signal of mechanotransduction in pressure-induced myogenic constriction, the relationship between Ca2+ sparks and transmural perfusion pressure was investigated in intact VSMCs of pressurized rat afferent arterioles. Spontaneous Ca2+ sparks were found in VSMCs when afferent arterioles were perfused at 80 mmHg. The spark frequency was significantly increased when perfusion pressure was increased to 120 mmHg. A similar increase of spark frequency was also observed in arterioles stimulated with β1-integrin-activating antibody. Moreover, spark frequency was significantly higher in arterioles of spontaneous hypertensive rats at 80 and 120 mmHg. Spontaneous membrane current recorded using whole cell perforated patch in renal VSMCs showed predominant activity of spontaneous transient inward currents instead of spontaneous transient outward currents when holding potential was set close to physiological resting membrane potential. Real-time PCR and immunohistochemistry confirmed the expression of Ca2+-activated Cl- channel (ClCa) TMEM16A in renal VSMCs. Inhibition of TMEM16A with T16Ainh-A01 impaired the pressure-induced myogenic contraction in perfused afferent arterioles. Our study, for the first time to our knowledge, detected Ca2+ sparks in VSMCs of intact afferent arterioles, and their frequencies were positively modulated by the perfusion pressure. Our results suggest that Ca2+ sparks may couple to ClCa channels and trigger pressure-induced myogenic constriction via membrane depolarization.
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Affiliation(s)
- Kay-Pong Yip
- Department of Molecular Pharmacology and Physiology, University of South Florida , Tampa, Florida
| | - Lavanya Balasubramanian
- Department of Molecular Pharmacology and Physiology, University of South Florida , Tampa, Florida
| | - Chen Kan
- Department of Industrial, Manufacturing, and System Engineering, University of Texas at Arlington , Arlington, Texas
| | - Lei Wang
- Department of Molecular Pharmacology and Physiology, University of South Florida , Tampa, Florida
| | - Ruisheng Liu
- Department of Molecular Pharmacology and Physiology, University of South Florida , Tampa, Florida
| | - Luisa Ribeiro-Silva
- Department of Molecular Pharmacology and Physiology, University of South Florida , Tampa, Florida
| | - James S K Sham
- Division of Pulmonary and Critical Care Medicine, Johns Hopkins University School of Medicine , Baltimore, Maryland
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15
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Role of osteopontin and its regulation in pancreatic islet. Biochem Biophys Res Commun 2017; 495:1426-1431. [PMID: 29180017 DOI: 10.1016/j.bbrc.2017.11.147] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 11/22/2017] [Indexed: 12/20/2022]
Abstract
Osteopontin (OPN) is involved in various physiological processes and also implicated in multiple pathological states. It has been suggested that OPN may have a role in type 2 diabetes (T2D) by protecting pancreatic islets and interaction with incretins. However, the regulation and function of OPN in islets, especially in humans, remains largely unexplored. In this study, we performed our investigations on both diabetic mouse model SUR1-E1506K+/+ and islets from human donors. We demonstrated that OPN protein, secretion and gene expression was elevated in the diabetic SUR1-E1506K+/+ islets. We also showed that high glucose and incretins simultaneously stimulated islet OPN secretion. In islets from human cadaver donors, OPN gene expression was elevated in diabetic islets, and externally added OPN significantly increased glucose-stimulated insulin secretion (GSIS) from diabetic but not normal glycemic donors. The increase in GSIS by OPN in diabetic human islets was Ca2+ dependent, which was abolished by Ca2+-channel inhibitor isradipine. Furthermore, we also confirmed that OPN promoted cell metabolic activity when challenged by high glucose. These observations provided evidence on the protective role of OPN in pancreatic islets under diabetic condition, and may point to novel therapeutic targets for islet protection in T2D.
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16
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Yin H, Fontana JM, Solandt J, Jussi JI, Xu H, Brismar H, Fu Y. Quantum dots modulate intracellular Ca 2+ level in lung epithelial cells. Int J Nanomedicine 2017; 12:2781-2792. [PMID: 28435258 PMCID: PMC5388247 DOI: 10.2147/ijn.s130136] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
While adverse effects of nanoparticles on lung health have previously been proposed, few studies have addressed the direct effects of nanoparticle exposure on the airway epithelium. In this work, we examine the response of the pulmonary airway to nanoparticles by measuring intracellular Ca2+ concentration ([Ca2+]i) in the Calu-3 epithelial layer stimulated by 3-mercaptopropionic-acid (3MPA) coated CdSe-CdS/ZnS core-multishell quantum dots (QDs). Simultaneous transient transepithelial electrical resistance (TEER) decrease and global [Ca2+]i increase in Calu-3 epithelial layer, accompanied by cell displacements, contraction, and expansion, were observed under QD deposition. This suggests that a QD-induced global [Ca2+]i increase in the Calu-3 epithelial layer caused the transient TEER decrease. The [Ca2+]i increase was marked and rapid in the apical region, while [Ca2+]i decreased in the basolateral region of the epithelial layer. TEER transient response and extracellular Ca2+ entry induced by QD deposition were completely inhibited in cells treated with stretched-activated (SA) inhibitor GdCl3 and store-operated calcium entry (SOCE) inhibitor BTP2 and in cells immersed in Ca2+-free medium. The voltage-gated calcium channel (VGCC) inhibitor nifedipine decreased, stabilized, and suppressed the TEER response, but did not affect the [Ca2+]i increase, due to QD deposition. This demonstrates that the Ca2+ influx activated by QDs’ mechanical stretch occurs through activation of both SA and SOCE channels. QD-induced [Ca2+]i increase occurred in the Calu-3 epithelial layer after culturing for 15 days, while significant TEER drop only occurred after 23 days. This work provides a new perspective from which to study direct interactions between airway epithelium and nanoparticles and may help to reveal the pathologies of pulmonary disease.
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Affiliation(s)
- Huijuan Yin
- Section of Cellular Biophysics, Department of Applied Physics, Royal Institute of Technology (KTH), Science for Life Laboratory, Solna
| | - Jacopo M Fontana
- Section of Cellular Biophysics, Department of Applied Physics, Royal Institute of Technology (KTH), Science for Life Laboratory, Solna
| | - Johan Solandt
- Section of Cellular Biophysics, Department of Applied Physics, Royal Institute of Technology (KTH), Science for Life Laboratory, Solna.,AstraZeneca R&D, Mölndal, Sweden
| | - Johnny Israelsson Jussi
- Section of Cellular Biophysics, Department of Applied Physics, Royal Institute of Technology (KTH), Science for Life Laboratory, Solna
| | - Hao Xu
- Section of Cellular Biophysics, Department of Applied Physics, Royal Institute of Technology (KTH), Science for Life Laboratory, Solna
| | - Hjalmar Brismar
- Section of Cellular Biophysics, Department of Applied Physics, Royal Institute of Technology (KTH), Science for Life Laboratory, Solna
| | - Ying Fu
- Section of Cellular Biophysics, Department of Applied Physics, Royal Institute of Technology (KTH), Science for Life Laboratory, Solna
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17
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Tykocki NR, Boerman EM, Jackson WF. Smooth Muscle Ion Channels and Regulation of Vascular Tone in Resistance Arteries and Arterioles. Compr Physiol 2017; 7:485-581. [PMID: 28333380 DOI: 10.1002/cphy.c160011] [Citation(s) in RCA: 212] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Vascular tone of resistance arteries and arterioles determines peripheral vascular resistance, contributing to the regulation of blood pressure and blood flow to, and within the body's tissues and organs. Ion channels in the plasma membrane and endoplasmic reticulum of vascular smooth muscle cells (SMCs) in these blood vessels importantly contribute to the regulation of intracellular Ca2+ concentration, the primary determinant of SMC contractile activity and vascular tone. Ion channels provide the main source of activator Ca2+ that determines vascular tone, and strongly contribute to setting and regulating membrane potential, which, in turn, regulates the open-state-probability of voltage gated Ca2+ channels (VGCCs), the primary source of Ca2+ in resistance artery and arteriolar SMCs. Ion channel function is also modulated by vasoconstrictors and vasodilators, contributing to all aspects of the regulation of vascular tone. This review will focus on the physiology of VGCCs, voltage-gated K+ (KV) channels, large-conductance Ca2+-activated K+ (BKCa) channels, strong-inward-rectifier K+ (KIR) channels, ATP-sensitive K+ (KATP) channels, ryanodine receptors (RyRs), inositol 1,4,5-trisphosphate receptors (IP3Rs), and a variety of transient receptor potential (TRP) channels that contribute to pressure-induced myogenic tone in resistance arteries and arterioles, the modulation of the function of these ion channels by vasoconstrictors and vasodilators, their role in the functional regulation of tissue blood flow and their dysfunction in diseases such as hypertension, obesity, and diabetes. © 2017 American Physiological Society. Compr Physiol 7:485-581, 2017.
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Affiliation(s)
- Nathan R Tykocki
- Department of Pharmacology, University of Vermont, Burlington, Vermont, USA
| | - Erika M Boerman
- Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, Missouri, USA
| | - William F Jackson
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, Michigan, USA
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18
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Lee W, Guilak F, Liedtke W. Role of Piezo Channels in Joint Health and Injury. CURRENT TOPICS IN MEMBRANES 2017; 79:263-273. [PMID: 28728820 DOI: 10.1016/bs.ctm.2016.10.003] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Cartilage is an intrinsically mechanically sensitive tissue composed of chondrocytes as the only cell type. Chondrocyte mechanotransduction is not well understood, but recently we identified critical components of the mechanotransduction machinery demonstrating how mechanical stimulation of these cells can be converted into cellular calcium signals. Physiologic mechanical cues induce anabolic responses of (post-mitotic) chondrocytes via transient receptor potential vanilloid 4 ion channels, whereas injurious mechanical stress is transduced by Piezo1 jointly with Piezo2 ion channels. This chapter sheds light on the latter discovery and provides a rationale for follow-up questions, such as the nature of interaction between Piezo1 and Piezo2, and their tethering to the cytoskeleton. These recent insights can be leveraged toward translational medical progress to benefit diagnosis and treatment of osteoarthritis, representing a large and growing unmet medical need in the United States and large parts of the world.
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Affiliation(s)
- W Lee
- Duke University Medical Center, Durham, NC, United States
| | - F Guilak
- Washington University in St Louis and Shriners Hospitals for Children, St Louis, MO, United States
| | - W Liedtke
- Duke University Medical Center, Durham, NC, United States
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19
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Choi Y, Park JE, Jeong JS, Park JK, Kim J, Jeon S. Sound Waves Induce Neural Differentiation of Human Bone Marrow-Derived Mesenchymal Stem Cells via Ryanodine Receptor-Induced Calcium Release and Pyk2 Activation. Appl Biochem Biotechnol 2016; 180:682-694. [DOI: 10.1007/s12010-016-2124-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 05/06/2016] [Indexed: 02/05/2023]
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20
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Colinas O, Moreno-Domínguez A, Zhu HL, Walsh EJ, Pérez-García MT, Walsh MP, Cole WC. α5-Integrin-mediated cellular signaling contributes to the myogenic response of cerebral resistance arteries. Biochem Pharmacol 2015; 97:281-91. [PMID: 26278977 DOI: 10.1016/j.bcp.2015.08.088] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Accepted: 08/10/2015] [Indexed: 12/24/2022]
Abstract
The myogenic response of resistance arterioles and small arteries involving constriction in response to intraluminal pressure elevation and dilation on pressure reduction is fundamental to local blood flow regulation in the microcirculation. Integrins have garnered considerable attention in the context of initiating the myogenic response, but evidence indicative of mechanotransduction by integrin adhesions, for example established changes in tyrosine phosphorylation of key adhesion proteins, has not been obtained to substantiate this interpretation. Here, we evaluated the role of integrin adhesions and associated cellular signaling in the rat cerebral arterial myogenic response using function-blocking antibodies against α5β1-integrins, pharmacological inhibitors of focal adhesion kinase (FAK) and Src family kinase (SFK), an ultra-high-sensitivity western blotting technique, site-specific phosphoprotein antibodies to quantify adhesion and contractile filament protein phosphorylation, and differential centrifugation to determine G-actin levels in rat cerebral arteries at varied intraluminal pressures. Pressure-dependent increases in the levels of phosphorylation of FAK (FAK-Y397, Y576/Y577), SFK (SFK-Y416; Y527 phosphorylation was reduced), vinculin-Y1065, paxillin-Y118 and phosphoinositide-specific phospholipase C-γ1 (PLCγ1)-Y783 were detected. Treatment with α5-integrin function-blocking antibodies, FAK inhibitor FI-14 or SFK inhibitor SU6656 suppressed the changes in adhesion protein phosphorylation, and prevented pressure-dependent phosphorylation of the myosin targeting subunit of myosin light chain phosphatase (MYPT1) at T855 and 20kDa myosin regulatory light chains (LC20) at S19, as well as actin polymerization that are necessary for myogenic constriction. We conclude that mechanotransduction by integrin adhesions and subsequent cellular signaling play a fundamental role in the cerebral arterial myogenic response.
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Affiliation(s)
- Olaia Colinas
- Smooth Muscle Research Group, Department of Physiology and Pharmacology, Hotchkiss Brain Institute and Libin Cardiovascular Institute, University of Calgary, Alberta, Canada.
| | - Alejandro Moreno-Domínguez
- Smooth Muscle Research Group, Department of Physiology and Pharmacology, Hotchkiss Brain Institute and Libin Cardiovascular Institute, University of Calgary, Alberta, Canada.
| | - Hai-Lei Zhu
- Smooth Muscle Research Group, Department of Physiology and Pharmacology, Hotchkiss Brain Institute and Libin Cardiovascular Institute, University of Calgary, Alberta, Canada.
| | - Emma J Walsh
- Smooth Muscle Research Group, Department of Physiology and Pharmacology, Hotchkiss Brain Institute and Libin Cardiovascular Institute, University of Calgary, Alberta, Canada.
| | - M Teresa Pérez-García
- Department of Physiology, Instituto de Biología y Genética Molecular, University of Valladolid, Valladolid, Spain.
| | - Michael P Walsh
- Smooth Muscle Research Group, Department of Biochemistry and Molecular Biology, Hotchkiss Brain Institute and Libin Cardiovascular Institute, University of Calgary, Alberta, Canada.
| | - William C Cole
- Smooth Muscle Research Group, Department of Physiology and Pharmacology, Hotchkiss Brain Institute and Libin Cardiovascular Institute, University of Calgary, Alberta, Canada.
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21
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Abstract
Intrarenal autoregulatory mechanisms maintain renal blood flow (RBF) and glomerular filtration rate (GFR) independent of renal perfusion pressure (RPP) over a defined range (80-180 mmHg). Such autoregulation is mediated largely by the myogenic and the macula densa-tubuloglomerular feedback (MD-TGF) responses that regulate preglomerular vasomotor tone primarily of the afferent arteriole. Differences in response times allow separation of these mechanisms in the time and frequency domains. Mechanotransduction initiating the myogenic response requires a sensing mechanism activated by stretch of vascular smooth muscle cells (VSMCs) and coupled to intracellular signaling pathways eliciting plasma membrane depolarization and a rise in cytosolic free calcium concentration ([Ca(2+)]i). Proposed mechanosensors include epithelial sodium channels (ENaC), integrins, and/or transient receptor potential (TRP) channels. Increased [Ca(2+)]i occurs predominantly by Ca(2+) influx through L-type voltage-operated Ca(2+) channels (VOCC). Increased [Ca(2+)]i activates inositol trisphosphate receptors (IP3R) and ryanodine receptors (RyR) to mobilize Ca(2+) from sarcoplasmic reticular stores. Myogenic vasoconstriction is sustained by increased Ca(2+) sensitivity, mediated by protein kinase C and Rho/Rho-kinase that favors a positive balance between myosin light-chain kinase and phosphatase. Increased RPP activates MD-TGF by transducing a signal of epithelial MD salt reabsorption to adjust afferent arteriolar vasoconstriction. A combination of vascular and tubular mechanisms, novel to the kidney, provides for high autoregulatory efficiency that maintains RBF and GFR, stabilizes sodium excretion, and buffers transmission of RPP to sensitive glomerular capillaries, thereby protecting against hypertensive barotrauma. A unique aspect of the myogenic response in the renal vasculature is modulation of its strength and speed by the MD-TGF and by a connecting tubule glomerular feedback (CT-GF) mechanism. Reactive oxygen species and nitric oxide are modulators of myogenic and MD-TGF mechanisms. Attenuated renal autoregulation contributes to renal damage in many, but not all, models of renal, diabetic, and hypertensive diseases. This review provides a summary of our current knowledge regarding underlying mechanisms enabling renal autoregulation in health and disease and methods used for its study.
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Affiliation(s)
- Mattias Carlström
- Department of Medicine, Division of Nephrology and Hypertension and Hypertension, Kidney and Vascular Research Center, Georgetown University, Washington, District of Columbia; Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden; and Department of Cell Biology and Physiology, UNC Kidney Center, and McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Christopher S Wilcox
- Department of Medicine, Division of Nephrology and Hypertension and Hypertension, Kidney and Vascular Research Center, Georgetown University, Washington, District of Columbia; Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden; and Department of Cell Biology and Physiology, UNC Kidney Center, and McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - William J Arendshorst
- Department of Medicine, Division of Nephrology and Hypertension and Hypertension, Kidney and Vascular Research Center, Georgetown University, Washington, District of Columbia; Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden; and Department of Cell Biology and Physiology, UNC Kidney Center, and McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
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22
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Hong Z, Reeves KJ, Sun Z, Li Z, Brown NJ, Meininger GA. Vascular smooth muscle cell stiffness and adhesion to collagen I modified by vasoactive agonists. PLoS One 2015; 10:e0119533. [PMID: 25745858 PMCID: PMC4351978 DOI: 10.1371/journal.pone.0119533] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Accepted: 01/22/2015] [Indexed: 11/25/2022] Open
Abstract
In vascular smooth muscle cells (VSMCs) integrin-mediated adhesion to extracellular matrix (ECM) proteins play important roles in sustaining vascular tone and resistance. The main goal of this study was to determine whether VSMCs adhesion to type I collagen (COL-I) was altered in parallel with the changes in the VSMCs contractile state induced by vasoconstrictors and vasodilators. VSMCs were isolated from rat cremaster skeletal muscle arterioles and maintained in primary culture without passage. Cell adhesion and cell E-modulus were assessed using atomic force microscopy (AFM) by repetitive nano-indentation of the AFM probe on the cell surface at 0.1 Hz sampling frequency and 3200 nm Z-piezo travelling distance (approach and retraction). AFM probes were tipped with a 5 μm diameter microbead functionalized with COL-I (1mg\ml). Results showed that the vasoconstrictor angiotensin II (ANG-II; 10−6) significantly increased (p<0.05) VSMC E-modulus and adhesion probability to COL-I by approximately 35% and 33%, respectively. In contrast, the vasodilator adenosine (ADO; 10−4) significantly decreased (p<0.05) VSMC E-modulus and adhesion probability by approximately −33% and −17%, respectively. Similarly, the NO donor (PANOate, 10−6 M), a potent vasodilator, also significantly decreased (p<0.05) the VSMC E-modulus and COL-I adhesion probability by −38% and −35%, respectively. These observations support the hypothesis that integrin-mediated VSMC adhesion to the ECM protein COL-I is dynamically regulated in parallel with VSMC contractile activation. These data suggest that the signal transduction pathways modulating VSMC contractile activation and relaxation, in addition to ECM adhesion, interact during regulation of contractile state.
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Affiliation(s)
- Zhongkui Hong
- Dalton Cardiovascular Research Center, University of Missouri, Columbia, Missouri, United States of America
- Department of Pharmacology and Physiology, University of Missouri, Columbia, Missouri, United States of America
| | - Kimberley J. Reeves
- Dalton Cardiovascular Research Center, University of Missouri, Columbia, Missouri, United States of America
| | - Zhe Sun
- Dalton Cardiovascular Research Center, University of Missouri, Columbia, Missouri, United States of America
- Department of Pharmacology and Physiology, University of Missouri, Columbia, Missouri, United States of America
| | - Zhaohui Li
- Dalton Cardiovascular Research Center, University of Missouri, Columbia, Missouri, United States of America
| | - Nicola J. Brown
- Department of Oncology, University of Sheffield, Sheffield, United Kingdom
| | - Gerald A. Meininger
- Dalton Cardiovascular Research Center, University of Missouri, Columbia, Missouri, United States of America
- Department of Pharmacology and Physiology, University of Missouri, Columbia, Missouri, United States of America
- * E-mail:
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23
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Kim TJ, Joo C, Seong J, Vafabakhsh R, Botvinick EL, Berns MW, Palmer AE, Wang N, Ha T, Jakobsson E, Sun J, Wang Y. Distinct mechanisms regulating mechanical force-induced Ca²⁺ signals at the plasma membrane and the ER in human MSCs. eLife 2015; 4:e04876. [PMID: 25667984 PMCID: PMC4337650 DOI: 10.7554/elife.04876] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Accepted: 01/21/2015] [Indexed: 12/21/2022] Open
Abstract
It is unclear that how subcellular organelles respond to external mechanical stimuli. Here, we investigated the molecular mechanisms by which mechanical force regulates Ca2+ signaling at endoplasmic reticulum (ER) in human mesenchymal stem cells. Without extracellular Ca2+, ER Ca2+ release is the source of intracellular Ca2+ oscillations induced by laser-tweezer-traction at the plasma membrane, providing a model to study how mechanical stimuli can be transmitted deep inside the cell body. This ER Ca2+ release upon mechanical stimulation is mediated not only by the mechanical support of cytoskeleton and actomyosin contractility, but also by mechanosensitive Ca2+ permeable channels on the plasma membrane, specifically TRPM7. However, Ca2+ influx at the plasma membrane via mechanosensitive Ca2+ permeable channels is only mediated by the passive cytoskeletal structure but not active actomyosin contractility. Thus, active actomyosin contractility is essential for the response of ER to the external mechanical stimuli, distinct from the mechanical regulation at the plasma membrane. DOI:http://dx.doi.org/10.7554/eLife.04876.001 Cells receive many signals from their environment, for example, when they are compressed or pulled about by neighboring cells. Information about these ‘mechanical stimuli’ can be transmitted within the cell to trigger changes in gene expression and cell behavior. When a cell receives a mechanical stimulus, it can activate the release of calcium ions from storage compartments within the cell, including from a compartment called the endoplasmic reticulum. Calcium ions can also enter the cell from outside via channels located in the membrane that surrounds the cell (the plasma membrane). Kim et al. investigated how mechanical forces are transmitted in a type of human cell called mesenchymal stem cells using optical tweezers to apply a gentle force to the outside of a cell. These tweezers use a laser to attract tiny objects, in this case a bead attached to proteins in the cell's outer membrane. The cell's response to this mechanical stimulation was measured using a sensor protein that fluoresces a different color when it binds to calcium ions. With this set-up, Kim et al. found that mesenchymal stem cells are able to transmit mechanical forces to different depths within the cell. The forces can travel deep to trigger the release of calcium ions from the endoplasmic reticulum. This process involves a network of protein fibers that criss-cross to support the structure of a cell—called the cytoskeleton—and also requires proteins that are associated with the cytoskeleton to contract. However, calcium ion entry through the plasma membrane due to a mechanical force does not require these contractile proteins—only the cytoskeleton is involved. These results demonstrate that the transmission of mechanical signals to different depths within mesenchymal stem cells involves different components. Future work should shed light on how these mechanical signals control gene expression and the development of mesenchymal stem cells. DOI:http://dx.doi.org/10.7554/eLife.04876.002
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Affiliation(s)
- Tae-Jin Kim
- Neuroscience Program, University of Illinois, Urbana-Champaign, Urbana, United States
| | - Chirlmin Joo
- Department of Physics, University of Illinois, Urbana-Champaign, Urbana, United States
| | - Jihye Seong
- Neuroscience Program, University of Illinois, Urbana-Champaign, Urbana, United States
| | - Reza Vafabakhsh
- Department of Physics, University of Illinois, Urbana-Champaign, Urbana, United States
| | - Elliot L Botvinick
- Department of Biomedical Engineering, Beckman Laser Institute, University of California, Irvine, Irvine, United States
| | - Michael W Berns
- Department of Biomedical Engineering, Beckman Laser Institute, University of California, Irvine, Irvine, United States
| | - Amy E Palmer
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Boulder, United States
| | - Ning Wang
- Department of Mechanical Science and Engineering, University of Illinois, Urbana-Champaign, Urbana, United States
| | - Taekjip Ha
- Department of Physics, University of Illinois, Urbana-Champaign, Urbana, United States
| | - Eric Jakobsson
- Beckman Institute for Advanced Science and Technology, University of Illinois, Urbana-Champaign, Urbana, United States
| | - Jie Sun
- Beckman Institute for Advanced Science and Technology, University of Illinois, Urbana-Champaign, Urbana, United States
| | - Yingxiao Wang
- Neuroscience Program, University of Illinois, Urbana-Champaign, Urbana, United States
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24
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Synergy between Piezo1 and Piezo2 channels confers high-strain mechanosensitivity to articular cartilage. Proc Natl Acad Sci U S A 2014; 111:E5114-22. [PMID: 25385580 DOI: 10.1073/pnas.1414298111] [Citation(s) in RCA: 259] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Diarthrodial joints are essential for load bearing and locomotion. Physiologically, articular cartilage sustains millions of cycles of mechanical loading. Chondrocytes, the cells in cartilage, regulate their metabolic activities in response to mechanical loading. Pathological mechanical stress can lead to maladaptive cellular responses and subsequent cartilage degeneration. We sought to deconstruct chondrocyte mechanotransduction by identifying mechanosensitive ion channels functioning at injurious levels of strain. We detected robust expression of the recently identified mechanosensitive channels, PIEZO1 and PIEZO2. Combined directed expression of Piezo1 and -2 sustained potentiated mechanically induced Ca(2+) signals and electrical currents compared with single-Piezo expression. In primary articular chondrocytes, mechanically evoked Ca(2+) transients produced by atomic force microscopy were inhibited by GsMTx4, a PIEZO-blocking peptide, and by Piezo1- or Piezo2-specific siRNA. We complemented the cellular approach with an explant-cartilage injury model. GsMTx4 reduced chondrocyte death after mechanical injury, suggesting a possible therapy for reducing cartilage injury and posttraumatic osteoarthritis by attenuating Piezo-mediated cartilage mechanotransduction of injurious strains.
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25
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Staiculescu MC, Ramirez-Perez FI, Castorena-Gonzalez JA, Hong Z, Sun Z, Meininger GA, Martinez-Lemus LA. Lysophosphatidic acid induces integrin activation in vascular smooth muscle and alters arteriolar myogenic vasoconstriction. Front Physiol 2014; 5:413. [PMID: 25400583 PMCID: PMC4215695 DOI: 10.3389/fphys.2014.00413] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Accepted: 10/06/2014] [Indexed: 01/16/2023] Open
Abstract
In vascular smooth muscle cells (VSMC) increased integrin adhesion to extracellular matrix (ECM) proteins, as well as the production of reactive oxygen species (ROS) are strongly stimulated by lysophosphatidic acid (LPA). We hypothesized that LPA-induced generation of ROS increases integrin adhesion to the ECM. Using atomic force microscopy (AFM) we determined the effects of LPA on integrin adhesion to fibronectin (FN) in VSMC isolated from rat (Sprague-Dawley) skeletal muscle arterioles. In VSMC, exposure to LPA (2 μM) doubled integrin-FN adhesion compared to control cells (P < 0.05). LPA-induced integrin-FN adhesion was reduced by pre-incubation with antibodies against β1 and β3 integrins (50 μg/ml) by 66% (P < 0.05). Inhibition of LPA signaling via blockade of the LPA G-protein coupled receptors LPAR1 and LPAR3 with 10 μM Ki16425 reduced the LPA-enhanced adhesion of VSCM to FN by 40% (P < 0.05). Suppression of ROS with tempol (250 μM) or apocynin (300 μM) also reduced the LPA-induced FN adhesion by 47% (P < 0.05) and 59% (P < 0.05), respectively. Using confocal microscopy, we observed that blockade of LPA signaling, with Ki16425, reduced ROS by 45% (P < 0.05), to levels similar to control VSMC unexposed to LPA. In intact isolated arterioles, LPA (2 μM) exposure augmented the myogenic constriction response to step increases in intraluminal pressure (between 40 and 100 mm Hg) by 71% (P < 0.05). The blockade of LPA signaling, with Ki16425, decreased the LPA-enhanced myogenic constriction by 58% (P < 0.05). Similarly, blockade of LPA-induced ROS release with tempol or gp91 ds-tat decreased the LPA-enhanced myogenic constriction by 56% (P < 0.05) and 55% (P < 0.05), respectively. These results indicate that, in VSMC, LPA-induced integrin activation involves the G-protein coupled receptors LPAR1 and LPAR3, and the production of ROS, and that LPA may play an important role in the control of myogenic behavior in resistance vessels through ROS modulation of integrin activity.
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Affiliation(s)
| | - Francisco I Ramirez-Perez
- Dalton Cardiovascular Research Center, University of Missouri Columbia, MO, USA ; Department of Bioengineering, University of Missouri Columbia, MO, USA
| | - Jorge A Castorena-Gonzalez
- Dalton Cardiovascular Research Center, University of Missouri Columbia, MO, USA ; Department of Bioengineering, University of Missouri Columbia, MO, USA
| | - Zhongkui Hong
- Dalton Cardiovascular Research Center, University of Missouri Columbia, MO, USA
| | - Zhe Sun
- Dalton Cardiovascular Research Center, University of Missouri Columbia, MO, USA
| | - Gerald A Meininger
- Dalton Cardiovascular Research Center, University of Missouri Columbia, MO, USA ; Department of Bioengineering, University of Missouri Columbia, MO, USA ; Department of Medical Pharmacology and Physiology, University of Missouri Columbia, MO, USA
| | - Luis A Martinez-Lemus
- Dalton Cardiovascular Research Center, University of Missouri Columbia, MO, USA ; Department of Bioengineering, University of Missouri Columbia, MO, USA ; Department of Medical Pharmacology and Physiology, University of Missouri Columbia, MO, USA
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Kur J, Bankhead P, Scholfield CN, Curtis TM, McGeown JG. Ca(2+) sparks promote myogenic tone in retinal arterioles. Br J Pharmacol 2013; 168:1675-86. [PMID: 23126272 DOI: 10.1111/bph.12044] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Revised: 10/30/2012] [Accepted: 10/30/2012] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND AND PURPOSE Ca(2+) imaging reveals subcellular Ca(2+) sparks and global Ca(2+) waves/oscillations in vascular smooth muscle. It is well established that Ca(2+) sparks can relax arteries, but we have previously reported that sparks can summate to generate Ca(2+) waves/oscillations in unpressurized retinal arterioles, leading to constriction. We have extended these studies to test the functional significance of Ca(2+) sparks in the generation of myogenic tone in pressurized arterioles. EXPERIMENTAL APPROACH Isolated retinal arterioles (25-40 μm external diameter) were pressurized to 70 mmHg, leading to active constriction. Ca(2+) signals were imaged from arteriolar smooth muscle in the same vessels using Fluo4 and confocal laser microscopy. KEY RESULTS Tone development was associated with an increased frequency of Ca(2+) sparks and oscillations. Vasomotion was observed in 40% of arterioles and was associated with synchronization of Ca(2+) oscillations, quantifiable as an increased cross-correlation coefficient. Inhibition of Ca(2+) sparks with ryanodine, tetracaine, cyclopiazonic acid or nimodipine, or following removal of extracellular Ca(2+) , resulted in arteriolar relaxation. Cyclopiazonic acid-induced dilatation was associated with decreased Ca(2+) sparks and oscillations but with a sustained rise in the mean global cytoplasmic [Ca(2+) ] ([Ca(2+) ]c ), as measured using Fura2 and microfluorimetry. CONCLUSIONS AND IMPLICATIONS This study provides direct evidence that Ca(2+) sparks can play an excitatory role in pressurized arterioles, promoting myogenic tone. This contrasts with the generally accepted model in which sparks promote relaxation of vascular smooth muscle. Changes in vessel tone in the presence of cyclopiazonic acid correlated more closely with changes in spark and oscillation frequency than global [Ca(2+) ]c , underlining the importance of frequency-modulated signalling in vascular smooth muscle.
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Affiliation(s)
- J Kur
- Centre for Vision and Vascular Science, School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast, Belfast, UK
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Chung WS, Weissman JL, Farley J, Drummond HA. βENaC is required for whole cell mechanically gated currents in renal vascular smooth muscle cells. Am J Physiol Renal Physiol 2013; 304:F1428-37. [PMID: 23552864 DOI: 10.1152/ajprenal.00444.2012] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Myogenic constrictor responses in small renal arteries and afferent arterioles are suppressed in mice with reduced levels of β-epithelial Na⁺ channel (βENaC(m/m)). The underlying mechanism is unclear. Decreased activity of voltage-gated calcium channels (VGCC) or mechanically gated ion channels and increased activity of large conductance calcium-activated potassium (BK) channels are a few possible mechanisms. The purpose of this study was to determine if VGCC, BK, or mechanically gated ion channel activity was altered in renal vascular smooth muscle cell (VSMC) from βENaC(m/m) mice. To address this, we used whole cell patch-clamp electrophysiological approaches in freshly isolated renal VSMCs. Compared with βENaC(+/+) controls, the current-voltage relationships for VGCC and BK activity are similar in βENaC(m/m) mice. These findings suggest neither VGCC nor BK channel dysfunction accounts for reduced myogenic constriction in βENaC(m/m) mice. We then examined mechanically gated currents using a novel in vitro assay where VSMCs are mechanically activated by stretching an underlying elastomer. We found the mechanically gated currents, predominantly carried by Na⁺, are observed with less frequency (87 vs. 43%) and have smaller magnitude (-54.1 ± 12.5 vs. -20.9 ± 4.9 pA) in renal VSMCs from βENaC(m/m) mice. Residual currents are expected in this model since VSMC βENaC expression is reduced by 50%. These findings suggest βENaC is required for normal mechanically gated currents in renal VSMCs and their disruption may account for the reduced myogenic constriction in the βENaC(m/m) model. Our findings are consistent with the role of βENaC as a VSMC mechanosensor and function of evolutionarily related nematode degenerin proteins.
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Affiliation(s)
- Wen-Shuo Chung
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS 39216, USA
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Retailleau K, Toutain B, Galmiche G, Fassot C, Sharif-Naeini R, Kauffenstein G, Mericskay M, Duprat F, Grimaud L, Merot J, Lardeux A, Pizard A, Baudrie V, Jeunemaitre X, Feil R, Göthert JR, Lacolley P, Henrion D, Li Z, Loufrani L. Selective Involvement of Serum Response Factor in Pressure-Induced Myogenic Tone in Resistance Arteries. Arterioscler Thromb Vasc Biol 2013; 33:339-46. [DOI: 10.1161/atvbaha.112.300708] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Objective—
In resistance arteries, diameter adjustment in response to pressure changes depends on the vascular cytoskeleton integrity. Serum response factor (SRF) is a dispensable transcription factor for cellular growth, but its role remains unknown in resistance arteries. We hypothesized that SRF is required for appropriate microvascular contraction.
Methods and Results—
We used mice in which SRF was specifically deleted in smooth muscle or endothelial cells, and their control. Myogenic tone and pharmacological contraction was determined in resistance arteries. mRNA and protein expression were assessed by quantitative real-time PCR (qRT-PCR) and Western blot. Actin polymerization was determined by confocal microscopy. Stress-activated channel activity was measured by patch clamp. Myogenic tone developing in response to pressure was dramatically decreased by SRF deletion (5.9±2.3%) compared with control (16.3±3.2%). This defect was accompanied by decreases in actin polymerization, filamin A, myosin light chain kinase and myosin light chain expression level, and stress-activated channel activity and sensitivity in response to pressure. Contractions induced by phenylephrine or U46619 were not modified, despite a higher sensitivity to p38 blockade; this highlights a compensatory pathway, allowing normal receptor-dependent contraction.
Conclusion—
This study shows for the first time that SRF has a major part to play in the control of local blood flow via its central role in pressure-induced myogenic tone in resistance arteries.
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Affiliation(s)
- Kevin Retailleau
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Bertrand Toutain
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Guillaume Galmiche
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Céline Fassot
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Reza Sharif-Naeini
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Gilles Kauffenstein
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Mathias Mericskay
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Fabrice Duprat
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Linda Grimaud
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Jean Merot
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Aurelie Lardeux
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Anne Pizard
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Véronique Baudrie
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Xavier Jeunemaitre
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Robert Feil
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Joachim R. Göthert
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Patrick Lacolley
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Daniel Henrion
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Zhenlin Li
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
| | - Laurent Loufrani
- From the CNRS UMR-6214, INSERM U1083, Université d’Angers, PRES LUNAM, Angers, France (K.R., B.T., C.F., G.K., L.G., D.H., L.L.); CHU Angers, France (D.H., L.L.); Université Pierre & Marie Curie, Paris, France (G.G., M.M., Z.L.); IPMC-CNRS, Valbonne, France (R.S.-N., F.D.); INSERM 915, Nantes, France (J.M., A.L.); INSERM 961, Vandoeuvre les Nancy, France (A.P., P.L.); INSERM 970, Paris–Centre de Recherche Cardiovasculaire (PARCC), Faculty of Medicine, Université Paris Descartes, PRES Sorbonne
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Balasubramanian L, Lo CM, Sham JSK, Yip KP. Remanent cell traction force in renal vascular smooth muscle cells induced by integrin-mediated mechanotransduction. Am J Physiol Cell Physiol 2013; 304:C382-91. [PMID: 23325413 DOI: 10.1152/ajpcell.00234.2012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
It was previously demonstrated in isolated renal vascular smooth muscle cells (VSMCs) that integrin-mediated mechanotransduction triggers intracellular Ca(2+) mobilization, which is the hallmark of myogenic response in VSMCs. To test directly whether integrin-mediated mechanotransduction results in the myogenic response-like behavior in renal VSMCs, cell traction force microscopy was used to monitor cell traction force when the cells were pulled with fibronectin-coated or low density lipoprotein (LDL)-coated paramagnetic beads. LDL-coated beads were used as a control for nonintegrin-mediated mechanotransduction. Pulling with LDL-coated beads increased the cell traction force by 61 ± 12% (9 cells), which returned to the prepull level after the pulling process was terminated. Pulling with noncoated beads had a minimal increase in the cell traction force (12 ± 9%, 8 cells). Pulling with fibronectin-coated beads increased the cell traction force by 56 ± 20% (7 cells). However, the cell traction force was still elevated by 23 ± 14% after the pulling process was terminated. This behavior is analogous to the changes of vascular resistance in pressure-induced myogenic response, in which vascular resistance remains elevated after myogenic constriction. Fibronectin is a native ligand for α(5)β(1)-integrins in VSMCs. Similar remanent cell traction force was found when cells were pulled with beads coated with β(1)-integrin antibody (Ha2/5). Activation of β(1)-integrin with soluble antibody also triggered variations of cell traction force and Ca(2+) mobilization, which were abolished by the Src inhibitor. In conclusion, mechanical force transduced by α(5)β(1)-integrins triggered a myogenic response-like behavior in isolated renal VSMCs.
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Affiliation(s)
- Lavanya Balasubramanian
- Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA
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Huang C, Akaishi S, Ogawa R. Mechanosignaling pathways in cutaneous scarring. Arch Dermatol Res 2012; 304:589-97. [PMID: 22886298 DOI: 10.1007/s00403-012-1278-5] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2012] [Revised: 07/05/2012] [Accepted: 07/20/2012] [Indexed: 10/28/2022]
Abstract
Mechanotransduction is the process by which physical forces are sensed and converted into biochemical signals that then result in cellular responses. The discovery and development of various molecular pathways involved in this process have revolutionized the fundamental and clinical understanding regarding the formation and progression of cutaneous scars. The aim of this review is to report the recent advances in scar mechanosignaling research. The mechanosignaling pathways that participate in the formation and growth of cutaneous scars can be divided into those whose role in mechanoresponsiveness has been proven (the TGF-β/Smad, integrin, and calcium ion pathways) and those who have a possible but as yet unproven role (such as MAPK and G protein, Wnt/β-catenin, TNF-α/NF-κB, and interleukins). During scar development, these cellular mechanosignaling pathways interact actively with the extracellular matrix. They also crosstalk extensively with the hypoxia, inflammation, and angiogenesis pathways. The elucidation of scar mechanosignaling pathways provides a new platform for understanding scar development. This better understanding will facilitate research into this promising field and may help to promote the development of pharmacological interventions that could ultimately prevent, reduce, or even reverse scar formation or progression.
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Affiliation(s)
- Chenyu Huang
- Department of Plastic, Reconstructive and Aesthetic Surgery, Nippon Medical School, Sendagi, Bunkyo-ku, Tokyo, Japan
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31
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Hong Z, Sun Z, Li Z, Mesquitta WT, Trzeciakowski JP, Meininger GA. Coordination of fibronectin adhesion with contraction and relaxation in microvascular smooth muscle. Cardiovasc Res 2012; 96:73-80. [PMID: 22802110 DOI: 10.1093/cvr/cvs239] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
AIMS The regulation of vascular diameter by vasoconstrictors and vasodilators requires that vascular smooth muscle cells (VSMCs) be physically coupled to extracellular matrix (ECM) and neighbouring cells in order for a vessel to mechanically function and transfer force. The hypothesis was tested that integrin-mediated adhesion to the ECM is dynamically up-regulated in VSMCs during contractile activation in response to a vasoconstrictor and likewise down-regulated during relaxation in response to a vasodilator. METHODS AND RESULTS VSMCs were isolated from the Sprague-Dawley rat cremaster muscles. Atomic force microscopy (AFM) with fibronectin (FN)-functionalized probes was employed to investigate the biomechanical responses and adhesion of VSMCs. Responses to angiotensin II (Ang II; 10(-6) M) and adenosine (Ado; 10(-4) M) were recorded by measurements of cell cortical elasticity and cell adhesion. The results showed that Ang II caused an immediate increase in adhesion (+27%) between the probe and cell. Cell stiffness increased (+70%) in parallel with the adhesion change. Ado decreased adhesion (-15%) to FN and reduced (-30%) stiffness. CONCLUSION Changes in the receptor-mediated activation of the contractile apparatus cause parallel alterations in cell adhesion and cell cortical elasticity. These studies support the hypothesis that the regulation of cell adhesion is coordinated with contraction and demonstrate the dynamic nature of cell adhesion to the ECM. It is proposed that coordination of adhesion and VSMC contraction is an important mechanism that allows for an efficient transfer of force between the contractile apparatus of the cell and the extracellular environment.
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Affiliation(s)
- Zhongkui Hong
- Dalton Cardiovascular Research Center, University of Missouri, 134 Research Park Dr., Columbia, MO 65211, USA
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32
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Westcott EB, Goodwin EL, Segal SS, Jackson WF. Function and expression of ryanodine receptors and inositol 1,4,5-trisphosphate receptors in smooth muscle cells of murine feed arteries and arterioles. J Physiol 2012; 590:1849-69. [PMID: 22331418 DOI: 10.1113/jphysiol.2011.222083] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
We tested the hypothesis that vasomotor control is differentially regulated between feed arteries and downstream arterioles from the cremaster muscle of C57BL/6 mice. In isolated pressurized arteries, confocal Ca(2+) imaging of smooth muscle cells (SMCs) revealed Ca(2+) sparks and Ca(2+) waves. Ryanodine receptor (RyR) antagonists (ryanodine and tetracaine) inhibited both sparks and waves but increased global Ca(2+) and myogenic tone. In arterioles, SMCs exhibited only Ca(2+) waves that were insensitive to ryanodine or tetracaine. Pharmacological interventions indicated that RyRs are functionally coupled to large-conductance, Ca(2+)-activated K(+) channels (BK(Ca)) in SMCs of arteries, whereas BK(Ca) appear functionally coupled to voltage-gated Ca2+ channels in SMCs of arterioles. Inositol 1,4,5-trisphosphate receptor (IP3R) antagonists (xestospongin D or 2-aminoethoxydiphenyl borate) or a phospholipase C inhibitor (U73122) attenuated Ca(2+) waves, global Ca(2+) and myogenic tone in arteries and arterioles but had no effect on arterial sparks. Real-time PCR of isolated SMCs revealed RyR2 as the most abundant isoform transcript; arteries expressed twice the RyR2 but only 65% the RyR3 of arterioles and neither vessel expressed RyR1. Immunofluorescent localisation of RyR protein indicated bright, clustered staining of arterial SMCs in contrast to diffuse staining in arteriolar SMCs. Expression of IP(3)R transcripts and protein immunofluorescence were similar in SMCs of both vessels with IP(3)R1>>IP(3)R2>IP(3)R3. Despite similar expression of IP(3)Rs and dependence of Ca(2+) waves on IP(3)Rs, these data illustrate pronounced regional heterogeneity in function and expression of RyRs between SMCs of the same vascular resistance network. We conclude that vasomotor control is differentially regulated in feed arteries vs. downstream arterioles.
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Affiliation(s)
- Erika B Westcott
- Department of Pharmacology & Toxicology, Michigan State University, East Lansing, MI 48824, USA
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Abstract
Vasospasm of the cerebrovasculature is a common manifestation of blast-induced traumatic brain injury (bTBI) reported among combat casualties in the conflicts in Afghanistan and Iraq. Cerebral vasospasm occurs more frequently, and with earlier onset, in bTBI patients than in patients with other TBI injury modes, such as blunt force trauma. Though vasospasm is usually associated with the presence of subarachnoid hemorrhage (SAH), SAH is not required for vasospasm in bTBI, which suggests that the unique mechanics of blast injury could potentiate vasospasm onset, accounting for the increased incidence. Here, using theoretical and in vitro models, we show that a single rapid mechanical insult can induce vascular hypercontractility and remodeling, indicative of vasospasm initiation. We employed high-velocity stretching of engineered arterial lamellae to simulate the mechanical forces of a blast pulse on the vasculature. An hour after a simulated blast, injured tissues displayed altered intracellular calcium dynamics leading to hypersensitivity to contractile stimulus with endothelin-1. One day after simulated blast, tissues exhibited blast force dependent prolonged hypercontraction and vascular smooth muscle phenotype switching, indicative of remodeling. These results suggest that an acute, blast-like injury is sufficient to induce a hypercontraction-induced genetic switch that potentiates vascular remodeling, and cerebral vasospasm, in bTBI patients.
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Westcott EB, Jackson WF. Heterogeneous function of ryanodine receptors, but not IP3 receptors, in hamster cremaster muscle feed arteries and arterioles. Am J Physiol Heart Circ Physiol 2011; 300:H1616-30. [PMID: 21357503 DOI: 10.1152/ajpheart.00728.2010] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The roles played by ryanodine receptors (RyRs) and inositol 1,4,5-trisphosphate receptors (IP₃Rs) in vascular smooth muscle in the microcirculation remain unclear. Therefore, the function of both RyRs and IP₃Rs in Ca(²+) signals and myogenic tone in hamster cremaster muscle feed arteries and downstream arterioles were assessed using confocal imaging and pressure myography. Feed artery vascular smooth muscle displayed Ca(²+) sparks and Ca(²+) waves, which were inhibited by the RyR antagonists ryanodine (10 μM) or tetracaine (100 μM). Despite the inhibition of sparks and waves, ryanodine or tetracaine increased global intracellular Ca(²+) and constricted the arteries. The blockade of IP₃Rs with xestospongin D (5 μM) or 2-aminoethoxydiphenyl borate (100 μM) or the inhibition of phospholipase C using U-73122 (10 μM) also attenuated Ca(2+) waves without affecting Ca(²+) sparks. Importantly, the IP₃Rs and phospholipase C antagonists decreased global intracellular Ca(2+) and dilated the arteries. In contrast, cremaster arterioles displayed only Ca(²+) waves: Ca(²+) sparks were not observed, and neither ryanodine (10-50 μM) nor tetracaine (100 μM) affected either Ca(²+) signals or arteriolar tone despite the presence of functional RyRs as assessed by responses to the RyR agonist caffeine (10 mM). As in feed arteries, arteriolar Ca(²+) waves were attenuated by xestospongin D (5 μM), 2-aminoethoxydiphenyl borate (100 μM), and U-73122 (10 μM), accompanied by decreased global intracellular Ca(²+) and vasodilation. These findings highlight the contrasting roles played by RyRs and IP₃Rs in Ca(²+) signals and myogenic tone in feed arteries and demonstrate important differences in the function of RyRs between feed arteries and downstream arterioles.
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Affiliation(s)
- Erika B Westcott
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, Michigan, USA.
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Abstract
Magnetic nanoparticles can be coated with specific ligands that enable them to bind to receptors on a cell's surface. When a magnetic field is applied, it pulls on the particles so that they deliver nanoscale forces at the ligand-receptor bond. It has been observed that mechanical stimulation in this manner can activate cellular signaling pathways that are known as mechanotransduction pathways. Integrin receptors, stretch-activated ion channels, focal adhesions, and the cytoskeleton are key players in activating these pathways, but there is still much we do not know about how these mechanosensors work. Current evidence indicates that applied forces at these structures can activate Ca(2+) signaling, Src family protein kinase, MAPK, and RhoGTPase pathways. The techniques of magnetic twisting and magnetic tweezers, which use magnetic particles to apply forces to cells, afford a fine degree of control over how cells are stimulated and hold much promise in elucidating the fundamentals of mechanotransduction. The particles are generally not harmful to cellular health, and their nanoscale dimensions make them advantageous for probing a cell's molecular-scale sensory structures. This review highlights the basic aspects of magnetic nanoparticles, magnetic particle techniques and the structures and pathways that are involved in mechanotransduction.
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Affiliation(s)
- Nathan J Sniadecki
- Department of Mechanical Engineering, Box 352600 University of Washington, Seattle, Washington 98195, USA.
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Guan Z, Pollock JS, Cook AK, Hobbs JL, Inscho EW. Effect of epithelial sodium channel blockade on the myogenic response of rat juxtamedullary afferent arterioles. Hypertension 2009; 54:1062-9. [PMID: 19720952 DOI: 10.1161/hypertensionaha.109.137992] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The mechanotransduction mechanism underlying the myogenic response is poorly understood, but evidence implicates participation of epithelial sodium channel (ENaC)-like proteins. Therefore, the role of ENaC on the afferent arteriolar myogenic response was investigated in vitro using the blood-perfused juxtamedullary nephron technique. Papillectomy was used to isolate myogenic influences by eliminating tubuloglomerular feedback signals. Autoregulatory responses were assessed by manipulating perfusion pressure in 30-mm Hg steps. Under control conditions, arteriolar diameter increased by 15% from 13.0+/-1.3 to 14.7+/-1.2 microm (P<0.05) after reducing perfusion pressure from 100 to 70 mm Hg. Diameter decreased to 11.3+/-1.1 and 10.6+/-1.0 microm after increasing pressure to 130 and 160 mm Hg (88+/-1 and 81+/-2% of control diameter, P<0.05), respectively. Pressure-mediated autoregulatory responses were significantly inhibited by superfusion of 10 micromol/L amiloride (102+/-2, 97+/-4, and 94+/-3% of control diameter), or 10 micromol/L benzamil (106+/-5, 100+/-3, and 103+/-3% of control diameter), and when perfusing with blood containing 5 micromol/L amiloride (106+/-2, 97+/-4, and 97+/-4% of control diameter). Vasoconstrictor responses to 55 mmol/L KCl were preserved as diameters decreased by 67+/-4, 55+/-8, and 60+/-4% in afferent arterioles superfused with amiloride or benzamil, and perfused with amiloride, respectively. These responses were similar to responses obtained from control afferent arterioles (64+/-6%, P>0.05). Immunofluorescence revealed expression of the alpha, beta, and gamma subunits of ENaC in freshly isolated preglomerular microvascular smooth muscle cells. These results demonstrate that selective ENaC inhibitors attenuate afferent arteriolar myogenic responses and suggest that ENaC may function as mechanosensitive ion channels initiating pressure-dependent myogenic responses in rat juxtamedullary afferent arterioles.
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Affiliation(s)
- Zhengrong Guan
- Department of Physiology, Medical College of Georgia, Augusta, GA 30912, USA
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Regulation of the renal microcirculation by ryanodine receptors and calcium-induced calcium release. Curr Opin Nephrol Hypertens 2009; 18:40-9. [DOI: 10.1097/mnh.0b013e32831cf5bd] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Affiliation(s)
- Edward W Inscho
- Department of Physiology, Medical College of Georgia, 1120 15th St, Augusta, GA 30912-3000, USA.
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Abstract
The calcium ion (Ca(2+)) is the simplest and most versatile intracellular messenger known. The discovery of Ca(2+) sparks and a related family of elementary Ca(2+) signaling events has revealed fundamental principles of the Ca(2+) signaling system. A newly appreciated "digital" subsystem consisting of brief, high Ca(2+) concentration over short distances (nanometers to microns) comingles with an "analog" global Ca(2+) signaling subsystem. Over the past 15 years, much has been learned about the theoretical and practical aspects of spark formation and detection. The quest for the spark mechanisms [the activation, coordination, and termination of Ca(2+) release units (CRUs)] has met unexpected challenges, however, and raised vexing questions about CRU operation in situ. Ample evidence shows that Ca(2+) sparks catalyze many high-threshold Ca(2+) processes involved in cardiac and skeletal muscle excitation-contraction coupling, vascular tone regulation, membrane excitability, and neuronal secretion. Investigation of Ca(2+) sparks in diseases has also begun to provide novel insights into hypertension, cardiac arrhythmias, heart failure, and muscular dystrophy. An emerging view is that spatially and temporally patterned activation of the digital subsystem confers on intracellular Ca(2+) signaling an exquisite architecture in space, time, and intensity, which underpins signaling efficiency, stability, specificity, and diversity. These recent advances in "sparkology" thus promise to unify the simplicity and complexity of Ca(2+) signaling in biology.
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Affiliation(s)
- Heping Cheng
- Institute of Molecular Medicine, National Laboratory of Biomembrane and Membrane Biotechnology, Peking University, Beijing, China.
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Wu X, Yang Y, Gui P, Sohma Y, Meininger GA, Davis GE, Braun AP, Davis MJ. Potentiation of large conductance, Ca2+-activated K+ (BK) channels by alpha5beta1 integrin activation in arteriolar smooth muscle. J Physiol 2008; 586:1699-713. [PMID: 18218680 DOI: 10.1113/jphysiol.2007.149500] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Injury/degradation of the extracellular matrix (ECM) is associated with vascular wall remodelling and impaired reactivity, a process in which altered ECM-integrin interactions play key roles. Previously, we found that peptides containing the RGD integrin-binding sequence produce sustained vasodilatation of rat skeletal muscle arterioles. Here, we tested the hypothesis that RGD ligands work through alpha5beta1 integrin to modulate the activity of large conductance, Ca(2+)-activated K(+) (BK) channels in arteriolar smooth muscle. K(+) currents were recorded in single arteriolar myocytes using whole-cell and single-channel patch clamp methods. Activation of alpha5beta1 integrin by an appropriate, insoluble alpha5beta1 antibody resulted in a 30-50% increase in the amplitude of iberiotoxin (IBTX)-sensitive, whole-cell K(+) current. Current potentiation occurred 1-8 min after bead-antibody application to the cell surface. Similarly, the endogenous alpha5beta1 integrin ligand fibronectin (FN) potentiated IBTX-sensitive K(+) current by 26%. Current potentiation was blocked by the c-Src inhibitor PP2 but not by PP3 (0.1-1 mum). In cell-attached patches, number of open channels x open probability (NP(o)) of a 230-250 pS K(+) channel was significantly increased after FN application locally to the external surface of cell-attached patches through the recording pipette. In excised, inside-out patches, the same method of FN application led to large, significant increases in NP(o) and caused a leftward shift in the NP(o)-voltage relationship at constant [Ca(2+)]. PP2 (but not PP3) nearly abolished the effect of FN on channel activity, suggesting that signalling between the integrin and channel involved an increase in Ca(2+)sensitivity of the channel via a membrane-delimited pathway. The effects of alpha5beta1 integrin activation on both whole-cell and single-channel BK currents could be reproduced in HEK 293 cells expressing the BK channel alpha-subunit. This is the first demonstration at the single-channel level that integrin signalling can regulate an ion channel. Our results show that alpha5beta1 integrin activation potentiates BK channel activity in vascular smooth muscle through both Ca(2+)- and c-Src-dependent mechanisms. This mechanism is likely to play a role in the arteriolar dilatation and impaired vascular reactivity associated with ECM degradation.
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Affiliation(s)
- Xin Wu
- Department of Medical Pharmacology & Physiology, University of Missouri School of Medicine, 1 Hospital Dr, Rm M451, Columbia, MO 65212, USA.
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