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Sanders KM, Drumm BT, Cobine CA, Baker SA. Ca 2+ dynamics in interstitial cells: foundational mechanisms for the motor patterns in the gastrointestinal tract. Physiol Rev 2024; 104:329-398. [PMID: 37561138 DOI: 10.1152/physrev.00036.2022] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 06/29/2023] [Accepted: 08/06/2023] [Indexed: 08/11/2023] Open
Abstract
The gastrointestinal (GI) tract displays multiple motor patterns that move nutrients and wastes through the body. Smooth muscle cells (SMCs) provide the forces necessary for GI motility, but interstitial cells, electrically coupled to SMCs, tune SMC excitability, transduce inputs from enteric motor neurons, and generate pacemaker activity that underlies major motor patterns, such as peristalsis and segmentation. The interstitial cells regulating SMCs are interstitial cells of Cajal (ICC) and PDGF receptor (PDGFR)α+ cells. Together these cells form the SIP syncytium. ICC and PDGFRα+ cells express signature Ca2+-dependent conductances: ICC express Ca2+-activated Cl- channels, encoded by Ano1, that generate inward current, and PDGFRα+ cells express Ca2+-activated K+ channels, encoded by Kcnn3, that generate outward current. The open probabilities of interstitial cell conductances are controlled by Ca2+ release from the endoplasmic reticulum. The resulting Ca2+ transients occur spontaneously in a stochastic manner. Ca2+ transients in ICC induce spontaneous transient inward currents and spontaneous transient depolarizations (STDs). Neurotransmission increases or decreases Ca2+ transients, and the resulting depolarizing or hyperpolarizing responses conduct to other cells in the SIP syncytium. In pacemaker ICC, STDs activate voltage-dependent Ca2+ influx, which initiates a cluster of Ca2+ transients and sustains activation of ANO1 channels and depolarization during slow waves. Regulation of GI motility has traditionally been described as neurogenic and myogenic. Recent advances in understanding Ca2+ handling mechanisms in interstitial cells and how these mechanisms influence motor patterns of the GI tract suggest that the term "myogenic" should be replaced by the term "SIPgenic," as this review discusses.
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Affiliation(s)
- Kenton M Sanders
- Department of Physiology and Cell Biology, School of Medicine, University of Nevada-Reno, Reno, Nevada, United States
| | - Bernard T Drumm
- Smooth Muscle Research Centre, Dundalk Institute of Technology, Dundalk, Ireland
| | - Caroline A Cobine
- Smooth Muscle Research Centre, Dundalk Institute of Technology, Dundalk, Ireland
| | - Salah A Baker
- Department of Physiology and Cell Biology, School of Medicine, University of Nevada-Reno, Reno, Nevada, United States
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2
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Wang YX, Reyes-García J, Di Mise A, Zheng YM. Role of ryanodine receptor 2 and FK506-binding protein 12.6 dissociation in pulmonary hypertension. J Gen Physiol 2023; 155:213798. [PMID: 36625865 PMCID: PMC9836826 DOI: 10.1085/jgp.202213100] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 07/29/2022] [Accepted: 12/19/2022] [Indexed: 01/11/2023] Open
Abstract
Pulmonary hypertension (PH) is a devastating disease characterized by a progressive increase in pulmonary arterial pressure leading to right ventricular failure and death. A major cellular response in this disease is the contraction of smooth muscle cells (SMCs) of the pulmonary vasculature. Cell contraction is determined by the increase in intracellular Ca2+ concentration ([Ca2+]i), which is generated and regulated by various ion channels. Several studies by us and others have shown that ryanodine receptor 2 (RyR2), a Ca2+-releasing channel in the sarcoplasmic reticulum (SR), is an essential ion channel for the control of [Ca2+]i in pulmonary artery SMCs (PASMCs), thereby mediating the sustained vasoconstriction seen in PH. FK506-binding protein 12.6 (FKBP12.6) strongly associates with RyR2 to stabilize its functional activity. FKBP12.6 can be dissociated from RyR2 by a hypoxic stimulus to increase channel function and Ca2+ release, leading to pulmonary vasoconstriction and PH. More specifically, dissociation of the RyR2-FKBP12.6 complex is a consequence of increased mitochondrial ROS generation mediated by the Rieske iron-sulfur protein (RISP) at the mitochondrial complex III after hypoxia. Overall, RyR2/FKBP12.6 dissociation and the corresponding signaling pathway may be an important factor in the development of PH. Novel drugs and biologics targeting RyR2, FKBP12.6, and related molecules may become unique effective therapeutics for PH.
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Affiliation(s)
- Yong-Xiao Wang
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, USA,Correspondence to Yong-Xiao Wang:
| | - Jorge Reyes-García
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, USA,Departamento de Farmacología, Facultad de Medicina, Universidad Nacional Autónoma de México,Ciudad de México, México
| | - Annarita Di Mise
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, USA,Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - Yun-Min Zheng
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, USA,Yun-Min Zheng:
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Feng X, Yu T, Zhang Y, Li L, Qu M, Wang J, Dong F, Zhang L, Wang F, Zhang F, Zhou X, Xu Z, Man D. Prenatal High-Sucrose Diet Induced Vascular Dysfunction in Thoracic Artery of Fetal Offspring. Mol Nutr Food Res 2021; 65:e2100072. [PMID: 33938121 DOI: 10.1002/mnfr.202100072] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 04/19/2021] [Indexed: 12/18/2022]
Abstract
SCOPE Maternal nutrition during pregnancy is related to intrauterine fetal development. The authors' previous work reports that prenatal high sucrose (HS) diet impaired micro-vascular functions in postnatal offspring. It is unclear whether/how prenatal HS causes vascular injury during fetal life. METHODS AND RESULTS Pregnant rats are fed with normal drinking water or 20% high-sucrose solution during the whole gestational period. Pregnant HS increases maternal weight before delivery. Fetal thoracic aorta is separated for experiments. Angiotensin II (AII)-stimulated vascular contraction of fetal thoracic arteries in HS group is greater, which mainly results from the enhanced AT1 receptor (AT1R) function and the downstream signaling. Nifedipine significantly increases vascular tension in HS group, indicating that the L-type calcium channels (LTCCs) function is strengthened. 2-Aminoethyl diphenylborinate (2-APB), inositol 1,4,5-trisphosphate receptors (IP3Rs) inhibitor, increases vascular tension induced by AII in HS group and ryanodine receptors-sensitive vascular tone shows no difference in the two groups, which suggested that the activity of IP3Rs-operated calcium channels is increased. CONCLUSION These findings suggest that prenatal HS induces vascular dysfunction of thoracic arteries in fetal offspring by enhancing AT1R, LTCCs function and IP3Rs-associated calcium channels, providing new information regarding the impact of prenatal HS on the functional development of fetal vascular systems.
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Affiliation(s)
- Xueqin Feng
- Department of Obstetrics, Affiliated Hospital of Jining Medical University, Guhuai Road 89, Jining, 272001, China
| | - Tiantian Yu
- Department of Clinical Medicine, Jining Medical University, Hehua Road 133, Jining, 272067, China
| | - Yumeng Zhang
- Institute for Fetology, First Hospital of Soochow University, Renmin Road 708, Jiangsu, 215006, China
| | - Lijuan Li
- Department of Obstetrics, Affiliated Hospital of Jining Medical University, Guhuai Road 89, Jining, 272001, China
| | - Miaomiao Qu
- Department of Obstetrics, Affiliated Hospital of Jining Medical University, Guhuai Road 89, Jining, 272001, China
| | - Jishui Wang
- Department of Obstetrics, Affiliated Hospital of Jining Medical University, Guhuai Road 89, Jining, 272001, China
| | - Fangxiang Dong
- Department of Obstetrics, Affiliated Hospital of Jining Medical University, Guhuai Road 89, Jining, 272001, China
| | - Lihua Zhang
- Department of Obstetrics, Affiliated Hospital of Jining Medical University, Guhuai Road 89, Jining, 272001, China
| | - Fengge Wang
- Department of Obstetrics, Affiliated Hospital of Jining Medical University, Guhuai Road 89, Jining, 272001, China
| | - Fanyong Zhang
- Department of Obstetrics, Affiliated Hospital of Jining Medical University, Guhuai Road 89, Jining, 272001, China
| | - Xiuwen Zhou
- Institute for Fetology, First Hospital of Soochow University, Renmin Road 708, Jiangsu, 215006, China
| | - Zhice Xu
- Institute for Fetology, First Hospital of Soochow University, Renmin Road 708, Jiangsu, 215006, China
- Institute for Fetology, Maternal and Child Health Care Hospital of Wuxi, Huaishu Road 48, Jiangsu, 214002, China
| | - Dongmei Man
- Department of Obstetrics, Affiliated Hospital of Jining Medical University, Guhuai Road 89, Jining, 272001, China
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Feng X, Zhang Y, Tao J, Lu L, Zhang Y, Liu J, Zhao M, Guo J, Zhu D, Zhu J, Xu Z. Comparison of Vascular Responses to Vasoconstrictors in Human Placenta in Preeclampsia between Preterm and Later Term. Curr Pharm Biotechnol 2020; 21:727-733. [PMID: 31845629 DOI: 10.2174/1389201021666191217114111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Revised: 11/02/2019] [Accepted: 11/11/2019] [Indexed: 01/18/2023]
Abstract
BACKGROUND Placental blood vessels play important roles in maternal-fetal circulation. Although pathologic mechanisms of preeclampsia are unclear, it is known that placental vascular dysfunction could contribute to pregnant hypertension. However, placental micro-vessel function or dysfunction at preterm has not been investigated. METHODS Human placentas from normal and preeclamptic pregnancies at preterm and term were obtained. Placental micro-vessels were used for determining vascular tension and responses to various vasoconstrictors as well as intracellular calcium store capability. It was the first time to show vascular responses in placental arteries to angiotensin II, endothelin-1, and other vascular drugs at preterm. RESULTS Compared to the control, placental vascular contractile responses to angiotensin II and caffeine were significantly decreased, while placental vascular responses to KCl, endothelin-1, and bradykinin were not significantly altered in the later term group in preeclampsia. In comparison of placental micro-vessel tension between the preterm and later term, caffeine- and serotonin-induced vascular contractions were significantly weaker in the preterm than that in the later term. On the contrary, vascular response to angiotensin II was increased in the preterm preeclampsia, while KCl-, endothelin-1, and bradykinin-mediated placental vessel responses in the preterm preeclampsia were similar to that in later term preeclampsia. CONCLUSION New data showed that micro-vessel responses to angiotensin II and serotonin, not endothelin- 1 or bradykinin, were significantly reduced in the human placentas at preterm, and intracellular Ca2+ store capacity was damaged too, providing important information on possible contributions of placental vascular dysfunction to pregnant hypertension.
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Affiliation(s)
- Xueqin Feng
- Institute for Fetology, First Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Yumeng Zhang
- Institute for Fetology, First Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Jianying Tao
- Department of Obstetrics and Gynecology, Suzhou Municipal Hospital, Suzhou, Jiangsu, China
| | - Likui Lu
- Institute for Fetology, First Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Yingying Zhang
- Institute for Fetology, First Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Jingliu Liu
- Institute for Fetology, First Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Meng Zhao
- Institute for Fetology, First Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Jun Guo
- Institute for Fetology, First Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Dan Zhu
- Institute for Fetology, First Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Jianguo Zhu
- Department of Pharmacy, First Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Zhice Xu
- Institute for Fetology, First Hospital of Soochow University, Suzhou, Jiangsu, China
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Modeling the role of endoplasmic reticulum-mitochondria microdomains in calcium dynamics. Sci Rep 2019; 9:17072. [PMID: 31745211 PMCID: PMC6864103 DOI: 10.1038/s41598-019-53440-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Accepted: 10/31/2019] [Indexed: 12/12/2022] Open
Abstract
Upon inositol trisphosphate (IP3) stimulation of non-excitable cells, including vascular endothelial cells, calcium (Ca2+) shuttling between the endoplasmic reticulum (ER) and mitochondria, facilitated by complexes called Mitochondria-Associated ER Membranes (MAMs), is known to play an important role in the occurrence of cytosolic Ca2+ concentration ([Ca2+]Cyt) oscillations. A mathematical compartmental closed-cell model of Ca2+ dynamics was developed that accounts for ER-mitochondria Ca2+ microdomains as the µd compartment (besides the cytosol, ER and mitochondria), Ca2+ influx to/efflux from each compartment and Ca2+ buffering. Varying the distribution of functional receptors in MAMs vs. the rest of ER/mitochondrial membranes, a parameter called the channel connectivity coefficient (to the µd), allowed for generation of [Ca2+]Cytoscillations driven by distinct mechanisms at various levels of IP3 stimulation. Oscillations could be initiated by the transient opening of IP3 receptors facing either the cytosol or the µd, and subsequent refilling of the respective compartment by Ca2+ efflux from the ER and/or the mitochondria. Only under conditions where the µd became the oscillation-driving compartment, silencing the Mitochondrial Ca2+ Uniporter led to oscillation inhibition. Thus, the model predicts that alternative mechanisms can yield [Ca2+]Cyt oscillations in non-excitable cells, and, under certain conditions, the ER-mitochondria µd can play a regulatory role.
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Nguyen EK, Koval OM, Noble P, Broadhurst K, Allamargot C, Wu M, Strack S, Thiel WH, Grumbach IM. CaMKII (Ca 2+/Calmodulin-Dependent Kinase II) in Mitochondria of Smooth Muscle Cells Controls Mitochondrial Mobility, Migration, and Neointima Formation. Arterioscler Thromb Vasc Biol 2018; 38:1333-1345. [PMID: 29599132 DOI: 10.1161/atvbaha.118.310951] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 03/12/2018] [Indexed: 12/19/2022]
Abstract
OBJECTIVE The main objective of this study is to define the mechanisms by which mitochondria control vascular smooth muscle cell (VSMC) migration and impact neointimal hyperplasia. APPROACH AND RESULTS The multifunctional CaMKII (Ca2+/calmodulin-dependent kinase II) in the mitochondrial matrix of VSMC drove a feed-forward circuit with the mitochondrial Ca2+ uniporter (MCU) to promote matrix Ca2+ influx. MCU was necessary for the activation of mitochondrial CaMKII (mtCaMKII), whereas mtCaMKII phosphorylated MCU at the regulatory site S92 that promotes Ca2+ entry. mtCaMKII was necessary and sufficient for platelet-derived growth factor-induced mitochondrial Ca2+ uptake. This effect was dependent on MCU. mtCaMKII and MCU inhibition abrogated VSMC migration and mitochondrial translocation to the leading edge. Overexpression of wild-type MCU, but not MCU S92A, mutant in MCU-/- VSMC rescued migration and mitochondrial mobility. Inhibition of microtubule, but not of actin assembly, blocked mitochondrial mobility. The outer mitochondrial membrane GTPase Miro-1 promotes mitochondrial mobility via microtubule transport but arrests it in subcellular domains of high Ca2+ concentrations. In Miro-1-/- VSMC, mitochondrial mobility and VSMC migration were abolished, and overexpression of mtCaMKII or a CaMKII inhibitory peptide in mitochondria (mtCaMKIIN) had no effect. Consistently, inhibition of mtCaMKII increased and prolonged cytosolic Ca2+ transients. mtCaMKII inhibition diminished phosphorylation of focal adhesion kinase and myosin light chain, leading to reduced focal adhesion turnover and cytoskeletal remodeling. In a transgenic model of selective mitochondrial CaMKII inhibition in VSMC, neointimal hyperplasia was significantly reduced after vascular injury. CONCLUSIONS These findings identify mitochondrial CaMKII as a key regulator of mitochondrial Ca2+ uptake via MCU, thereby controlling mitochondrial translocation and VSMC migration after vascular injury.
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Affiliation(s)
- Emily K Nguyen
- From the Department of Internal Medicine, Carver College of Medicine (E.K.N., O.M.K., P.N., K.B., W.H.T., I.M.G.).,Interdisciplinary Program in Molecular and Cellular Biology (E.K.N.)
| | - Olha M Koval
- From the Department of Internal Medicine, Carver College of Medicine (E.K.N., O.M.K., P.N., K.B., W.H.T., I.M.G.)
| | - Paige Noble
- From the Department of Internal Medicine, Carver College of Medicine (E.K.N., O.M.K., P.N., K.B., W.H.T., I.M.G.)
| | - Kim Broadhurst
- From the Department of Internal Medicine, Carver College of Medicine (E.K.N., O.M.K., P.N., K.B., W.H.T., I.M.G.)
| | | | - Meng Wu
- Division of Medicinal and Natural Products Chemistry, Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy (M.W.).,High Throughput Screening Facility (M.W.).,Department of Biochemistry, Carver College of Medicine (M.W.)
| | - Stefan Strack
- Department of Pharmacology, Carver College of Medicine (S.S.)
| | - William H Thiel
- From the Department of Internal Medicine, Carver College of Medicine (E.K.N., O.M.K., P.N., K.B., W.H.T., I.M.G.).,François Abboud Cardiovascular Research Center (W.H.T., I.M.G.)
| | - Isabella M Grumbach
- From the Department of Internal Medicine, Carver College of Medicine (E.K.N., O.M.K., P.N., K.B., W.H.T., I.M.G.) .,François Abboud Cardiovascular Research Center (W.H.T., I.M.G.).,Iowa City Veterans Affairs Healthcare System (I.M.G.), University of Iowa, Iowa City
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7
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Drumm BT, Sung TS, Zheng H, Baker SA, Koh SD, Sanders KM. The effects of mitochondrial inhibitors on Ca 2+ signalling and electrical conductances required for pacemaking in interstitial cells of Cajal in the mouse small intestine. Cell Calcium 2018; 72:1-17. [PMID: 29748128 DOI: 10.1016/j.ceca.2018.01.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 01/26/2018] [Accepted: 01/27/2018] [Indexed: 01/16/2023]
Abstract
Interstitial cells of Cajal (ICC-MY) are pacemakers that generate and propagate electrical slow waves in gastrointestinal (GI) muscles. Slow waves appear to be generated by the release of Ca2+ from intracellular stores and activation of Ca2+-activated Cl- channels (Ano1). Conduction of slow waves to smooth muscle cells coordinates rhythmic contractions. Mitochondrial Ca2+ handling is currently thought to be critical for ICC pacemaking. Protonophores, inhibitors of the electron transport chain (FCCP, CCCP or antimycin) or mitochondrial Na+/Ca2+ exchange blockers inhibited slow waves in several GI muscles. Here we utilized Ca2+ imaging of ICC in small intestinal muscles in situ to determine the effects of mitochondrial drugs on Ca2+ transients in ICC. Muscles were obtained from mice expressing a genetically encoded Ca2+ indicator (GCaMP3) in ICC. FCCP, CCCP, antimycin, a uniporter blocker, Ru360, and a mitochondrial Na+/Ca2+ exchange inhibitor, CGP-37157 inhibited Ca2+ transients in ICC-MY. Effects were not due to depletion of ATP, as oligomycin did not affect Ca2+ transients. Patch-clamp experiments were performed to test the effects of the mitochondrial drugs on key pacemaker conductances, Ano1 and T-type Ca2+ (CaV3.2), in HEK293 cells. Antimycin blocked Ano1 and reduced CaV3.2 currents. CCCP blocked CaV3.2 current but did not affect Ano1 current. Ano1 and Cav3.2 currents were inhibited by CGP-37157. Inhibitory effects of mitochondrial drugs on slow waves and Ca2+ signalling in ICC can be explained by direct antagonism of key pacemaker conductances in ICC that generate and propagate slow waves. A direct obligatory role for mitochondria in pacemaker activity is therefore questionable.
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Affiliation(s)
- Bernard T Drumm
- Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, NV 89557, USA
| | - Tae S Sung
- Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, NV 89557, USA
| | - Haifeng Zheng
- Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, NV 89557, USA
| | - Salah A Baker
- Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, NV 89557, USA
| | - Sang D Koh
- Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, NV 89557, USA
| | - Kenton M Sanders
- Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, NV 89557, USA.
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Hudecova S, Markova J, Simko V, Csaderova L, Stracina T, Sirova M, Fojtu M, Svastova E, Gronesova P, Pastorek M, Novakova M, Cholujova D, Kopacek J, Pastorekova S, Sedlak J, Krizanova O. Sulforaphane-induced apoptosis involves the type 1 IP3 receptor. Oncotarget 2018; 7:61403-61418. [PMID: 27528021 PMCID: PMC5308660 DOI: 10.18632/oncotarget.8968] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Accepted: 04/15/2016] [Indexed: 12/15/2022] Open
Abstract
In this study we show that anti-tumor effect of sulforaphane (SFN) is partially realized through the type 1 inositol 1,4,5-trisphosphate receptor (IP3R1). This effect was verified in vitro on three different stable cell lines and also in vivo on the model of nude mice with developed tumors. Early response (6 hours) of A2780 ovarian carcinoma cells to SFN treatment involves generation of mitochondrial ROS and increased transcription of NRF2 and its downstream regulated genes including heme oxygenase 1, NAD(P)H:quinine oxidoreductase 1, and KLF9. Prolonged SFN treatment (24 hours) upregulated expression of NRF2 and IP3R1. SFN induces a time-dependent phosphorylation wave of HSP27. Use of IP3R inhibitor Xestospongin C (Xest) attenuates both SFN-induced apoptosis and the level of NRF2 protein expression. In addition, Xest partially attenuates anti-tumor effect of SFN in vivo. SFN-induced apoptosis is completely inhibited by silencing of IP3R1 gene but only partially blocked by silencing of NRF2; silencing of IP3R2 and IP3R3 had no effect on these cells. Xest inhibitor does not significantly modify SFN-induced increase in the rapid activity of ARE and AP1 responsive elements. We found that Xest effectively reverses the SFN-dependent increase of nuclear content and decrease of reticular calcium content. In addition, immunofluorescent staining with IP3R1 antibody revealed that SFN treatment induces translocation of IP3R1 to the nucleus. Our results clearly show that IP3R1 is involved in SFN-induced apoptosis through the depletion of reticular calcium and modulation of transcription factors through nuclear calcium up-regulation.
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Affiliation(s)
- Sona Hudecova
- Institute of Clinical and Translational Research, Biomedical Research Center, SAS, Bratislava, Slovakia
| | - Jana Markova
- Institute of Clinical and Translational Research, Biomedical Research Center, SAS, Bratislava, Slovakia
| | - Veronika Simko
- Institute of Virology, Biomedical Research Center, SAS, Bratislava, Slovakia
| | - Lucia Csaderova
- Institute of Virology, Biomedical Research Center, SAS, Bratislava, Slovakia
| | - Tibor Stracina
- Department of Physiology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Marta Sirova
- Institute of Clinical and Translational Research, Biomedical Research Center, SAS, Bratislava, Slovakia
| | - Michaela Fojtu
- Department of Physiology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Eliska Svastova
- Institute of Virology, Biomedical Research Center, SAS, Bratislava, Slovakia
| | - Paulina Gronesova
- Cancer Research Institute, Biomedical Research Center, SAS, Bratislava, Slovakia
| | - Michal Pastorek
- Cancer Research Institute, Biomedical Research Center, SAS, Bratislava, Slovakia
| | - Marie Novakova
- Department of Physiology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Dana Cholujova
- Cancer Research Institute, Biomedical Research Center, SAS, Bratislava, Slovakia
| | - Juraj Kopacek
- Institute of Virology, Biomedical Research Center, SAS, Bratislava, Slovakia
| | - Silvia Pastorekova
- Institute of Virology, Biomedical Research Center, SAS, Bratislava, Slovakia
| | - Jan Sedlak
- Cancer Research Institute, Biomedical Research Center, SAS, Bratislava, Slovakia
| | - Olga Krizanova
- Institute of Clinical and Translational Research, Biomedical Research Center, SAS, Bratislava, Slovakia
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Xiong S, Wang B, Lin S, Zhang H, Li Y, Wei X, Cui Y, Wei X, Lu Z, Gao P, Li L, Zhao Z, Liu D, Zhu Z. Activation of Transient Receptor Potential Melastatin Subtype 8 Attenuates Cold-Induced Hypertension Through Ameliorating Vascular Mitochondrial Dysfunction. J Am Heart Assoc 2017; 6:JAHA.117.005495. [PMID: 28768647 PMCID: PMC5586416 DOI: 10.1161/jaha.117.005495] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Background Environmental cold‐induced hypertension is common, but how to treat cold‐induced hypertension remains an obstacle. Transient receptor potential melastatin subtype 8 (TRPM8) is a mild cold‐sensing nonselective cation channel that is activated by menthol. Little is known about the effect of TRPM8 activation by menthol on mitochondrial Ca2+ homeostasis and the vascular function in cold‐induced hypertension. Methods and Results Primary vascular smooth muscle cells from wild‐type or Trpm8−/− mice were cultured. In vitro, we confirmed that sarcoplasmic reticulum–resident TRPM8 participated in the regulation of cellular and mitochondrial Ca2+ homeostasis in the vascular smooth muscle cells. TRPM8 activation by menthol antagonized angiotensin II induced mitochondrial respiratory dysfunction and excess reactive oxygen species generation by preserving pyruvate dehydrogenase activity, which hindered reactive oxygen species–triggered Ca2+ influx and the activation of RhoA/Rho kinase pathway. In vivo, long‐term noxious cold stimulation dramatically increased vasoconstriction and blood pressure. The activation of TRPM8 by dietary menthol inhibited vascular reactive oxygen species generation, vasoconstriction, and lowered blood pressure through attenuating excessive mitochondrial reactive oxygen species mediated the activation of RhoA/Rho kinase in a TRPM8‐dependent manner. These effects of menthol were further validated in angiotensin II–induced hypertensive mice. Conclusions Long‐term dietary menthol treatment targeting and preserving mitochondrial function may represent a nonpharmaceutical measure for environmental noxious cold–induced hypertension.
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Affiliation(s)
- Shiqiang Xiong
- Center for Hypertension and Metabolic Diseases Department of Hypertension and Endocrinology Daping Hospital Third Military Medical University Chongqing Institute of Hypertension, Chongqing, China
| | - Bin Wang
- Center for Hypertension and Metabolic Diseases Department of Hypertension and Endocrinology Daping Hospital Third Military Medical University Chongqing Institute of Hypertension, Chongqing, China
| | - Shaoyang Lin
- Center for Hypertension and Metabolic Diseases Department of Hypertension and Endocrinology Daping Hospital Third Military Medical University Chongqing Institute of Hypertension, Chongqing, China
| | - Hexuan Zhang
- Center for Hypertension and Metabolic Diseases Department of Hypertension and Endocrinology Daping Hospital Third Military Medical University Chongqing Institute of Hypertension, Chongqing, China
| | - Yingsha Li
- Center for Hypertension and Metabolic Diseases Department of Hypertension and Endocrinology Daping Hospital Third Military Medical University Chongqing Institute of Hypertension, Chongqing, China
| | - Xing Wei
- Center for Hypertension and Metabolic Diseases Department of Hypertension and Endocrinology Daping Hospital Third Military Medical University Chongqing Institute of Hypertension, Chongqing, China
| | - Yuanting Cui
- Center for Hypertension and Metabolic Diseases Department of Hypertension and Endocrinology Daping Hospital Third Military Medical University Chongqing Institute of Hypertension, Chongqing, China
| | - Xiao Wei
- Center for Hypertension and Metabolic Diseases Department of Hypertension and Endocrinology Daping Hospital Third Military Medical University Chongqing Institute of Hypertension, Chongqing, China
| | - Zongshi Lu
- Center for Hypertension and Metabolic Diseases Department of Hypertension and Endocrinology Daping Hospital Third Military Medical University Chongqing Institute of Hypertension, Chongqing, China
| | - Peng Gao
- Center for Hypertension and Metabolic Diseases Department of Hypertension and Endocrinology Daping Hospital Third Military Medical University Chongqing Institute of Hypertension, Chongqing, China
| | - Li Li
- Center for Hypertension and Metabolic Diseases Department of Hypertension and Endocrinology Daping Hospital Third Military Medical University Chongqing Institute of Hypertension, Chongqing, China
| | - Zhigang Zhao
- Center for Hypertension and Metabolic Diseases Department of Hypertension and Endocrinology Daping Hospital Third Military Medical University Chongqing Institute of Hypertension, Chongqing, China
| | - Daoyan Liu
- Center for Hypertension and Metabolic Diseases Department of Hypertension and Endocrinology Daping Hospital Third Military Medical University Chongqing Institute of Hypertension, Chongqing, China
| | - Zhiming Zhu
- Center for Hypertension and Metabolic Diseases Department of Hypertension and Endocrinology Daping Hospital Third Military Medical University Chongqing Institute of Hypertension, Chongqing, China
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Genet N, Billaud M, Rossignol R, Dubois M, Gillibert-Duplantier J, Isakson BE, Marthan R, Savineau JP, Guibert C. Signaling Pathways Linked to Serotonin-Induced Superoxide Anion Production: A Physiological Role for Mitochondria in Pulmonary Arteries. Front Physiol 2017; 8:76. [PMID: 28232807 PMCID: PMC5298976 DOI: 10.3389/fphys.2017.00076] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 01/26/2017] [Indexed: 11/13/2022] Open
Abstract
Serotonin (5-HT) is a potent vasoconstrictor agonist and contributes to several vascular diseases including systemic or pulmonary hypertension and atherosclerosis. Although superoxide anion (O2•_) is commonly associated to cellular damages due to O2•_ overproduction, we previously demonstrated that, in physiological conditions, O2•_ also participates to the 5-HT contraction in intrapulmonary arteries (IPA). Here, we focused on the signaling pathways leading to O2•_ production in response to 5-HT in rat IPA. Using electron paramagnetic resonance on rat IPA, we showed that 5-HT (100 μM)-induced O2•_ production was inhibited by ketanserin (1 μM—an inhibitor of the 5-HT2 receptor), absence of extracellular calcium, two blockers of voltage-independent calcium permeable channels (RHC80267 50 μM and LOE-908 10 μM) and a blocker of the mitochondrial complex I (rotenone—100 nM). Depletion of calcium from the sarcoplasmic reticulum or nicardipine (1 μM—an inhibitor of the L-type voltage-dependent calcium channel) had no effect on the 5-HT-induced O2•_ production. O2•_ levels were also increased by α-methyl-5-HT (10 μM—a 5-HT2 receptors agonist) whereas GR127935 (1 μM—an antagonist of the 5-HT1B/D receptor) and citalopram (1 μM—a 5-HT transporter inhibitor) had no effect on the 5-HT-induced O2•_ production. Peroxynitrites were increased in response to 5-HT (100 μM). In isolated pulmonary arterial smooth muscle cells loaded with rhod-2 or mitosox probes, we respectively showed that 5-HT increased both mitochondrial calcium and O2•_ levels, which were both abrogated in absence of extracellular calcium. Mitochondrial O2•_ levels were also abolished in the presence of rotenone (100 nM). In pulmonary arterial smooth muscle cells loaded with TMRM, we showed that 5-HT transiently depolarized the mitochondrial membrane whereas in the absence of extracellular calcium the mitochondrial membrane depolarisation was delayed and sustained in response to 5-HT. 5-HT decreased the mitochondrial respiratory rate measured with a Clark oxygen electrode. Altogether, in physiological conditions, 5-HT acts on 5-HT2 receptors and induces an O2•_ production dependent on extracellular calcium and mitochondria.
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Affiliation(s)
- Nafiisha Genet
- Centre de Recherche Cardio-Thoracique de Bordeaux, Institut National de la Santé et de la Recherche Médicale (INSERM), U1045Bordeaux, France; Centre de Recherche Cardio-Thoracique de Bordeaux, Université de BordeauxBordeaux, France
| | - Marie Billaud
- Robert M. Berne Cardiovascular Research Center Charlottesville, VA, USA
| | - Rodrigue Rossignol
- Maladies Rares: Génétique et Métabolisme, Université de Bordeaux Bordeaux, France
| | - Mathilde Dubois
- Centre de Recherche Cardio-Thoracique de Bordeaux, Institut National de la Santé et de la Recherche Médicale (INSERM), U1045Bordeaux, France; Centre de Recherche Cardio-Thoracique de Bordeaux, Université de BordeauxBordeaux, France
| | - Jennifer Gillibert-Duplantier
- Centre de Recherche Cardio-Thoracique de Bordeaux, Institut National de la Santé et de la Recherche Médicale (INSERM), U1045Bordeaux, France; Centre de Recherche Cardio-Thoracique de Bordeaux, Université de BordeauxBordeaux, France
| | - Brant E Isakson
- Robert M. Berne Cardiovascular Research Center Charlottesville, VA, USA
| | - Roger Marthan
- Centre de Recherche Cardio-Thoracique de Bordeaux, Institut National de la Santé et de la Recherche Médicale (INSERM), U1045Bordeaux, France; Centre de Recherche Cardio-Thoracique de Bordeaux, Université de BordeauxBordeaux, France
| | - Jean-Pierre Savineau
- Centre de Recherche Cardio-Thoracique de Bordeaux, Institut National de la Santé et de la Recherche Médicale (INSERM), U1045Bordeaux, France; Centre de Recherche Cardio-Thoracique de Bordeaux, Université de BordeauxBordeaux, France
| | - Christelle Guibert
- Centre de Recherche Cardio-Thoracique de Bordeaux, Institut National de la Santé et de la Recherche Médicale (INSERM), U1045Bordeaux, France; Centre de Recherche Cardio-Thoracique de Bordeaux, Université de BordeauxBordeaux, France
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11
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Abstract
Cardiovascular disease risk and all-cause mortality are largely predicted by physical fitness. Exercise stimulates vascular mitochondrial biogenesis through endothelial nitric oxide synthase (eNOS), sirtuins, and PPARγ coactivator 1α (PGC-1α), a response absent in diabetes and hypertension. We hypothesized that an agent regulating eNOS in the context of diabetes could reconstitute exercise-mediated signaling to mitochondrial biogenesis. Glucagon-like peptide 1 (GLP-1) stimulates eNOS and blood flow; we used saxagliptin, an inhibitor of GLP-1 degradation, to test whether vascular mitochondrial adaptation to exercise in diabetes could be restored. Goto-Kakizaki (GK) rats, a nonobese, type 2 diabetes model, and Wistar controls were exposed to an 8-day exercise intervention with or without saxagliptin (10 mg·kg−1·d−1). We evaluated the impact of exercise and saxagliptin on mitochondrial proteins and signaling pathways in aorta. Mitochondrial protein expression increased with exercise in the Wistar aorta and decreased or remained unchanged in the GK animals. GK rats treated with saxagliptin plus exercise showed increased expression of mitochondrial complexes, cytochrome c, eNOS, nNOS, PGC-1α, and UCP3 proteins. Notably, a 3-week saxagliptin plus exercise intervention significantly increased running time in the GK rats. These data suggest that saxagliptin restores vascular mitochondrial adaptation to exercise in a diabetic rodent model and may augment the impact of exercise on the vasculature.
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12
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Chaplin NL, Nieves-Cintrón M, Fresquez AM, Navedo MF, Amberg GC. Arterial Smooth Muscle Mitochondria Amplify Hydrogen Peroxide Microdomains Functionally Coupled to L-Type Calcium Channels. Circ Res 2015; 117:1013-23. [PMID: 26390880 DOI: 10.1161/circresaha.115.306996] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Accepted: 09/18/2015] [Indexed: 01/21/2023]
Abstract
RATIONALE Mitochondria are key integrators of convergent intracellular signaling pathways. Two important second messengers modulated by mitochondria are calcium and reactive oxygen species. To date, coherent mechanisms describing mitochondrial integration of calcium and oxidative signaling in arterial smooth muscle are incomplete. OBJECTIVE To address and add clarity to this issue, we tested the hypothesis that mitochondria regulate subplasmalemmal calcium and hydrogen peroxide microdomain signaling in cerebral arterial smooth muscle. METHODS AND RESULTS Using an image-based approach, we investigated the impact of mitochondrial regulation of L-type calcium channels on subcellular calcium and reactive oxygen species signaling microdomains in isolated arterial smooth muscle cells. Our single-cell observations were then related experimentally to intact arterial segments and to living animals. We found that subplasmalemmal mitochondrial amplification of hydrogen peroxide microdomain signaling stimulates L-type calcium channels, and that this mechanism strongly impacts the functional capacity of the vasoconstrictor angiotensin II. Importantly, we also found that disrupting this mitochondrial amplification mechanism in vivo normalized arterial function and attenuated the hypertensive response to systemic endothelial dysfunction. CONCLUSIONS From these observations, we conclude that mitochondrial amplification of subplasmalemmal calcium and hydrogen peroxide microdomain signaling is a fundamental mechanism regulating arterial smooth muscle function. As the principle components involved are fairly ubiquitous and positioning of mitochondria near the plasma membrane is not restricted to arterial smooth muscle, this mechanism could occur in many cell types and contribute to pathological elevations of intracellular calcium and increased oxidative stress associated with many diseases.
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Affiliation(s)
- Nathan L Chaplin
- From the Department of Biomedical Sciences, Colorado State University, Fort Collins (N.L.C., A.M.F., G.C.A.); and Department of Pharmacology, University of California, Davis (M.N.-C., M.F.N.)
| | - Madeline Nieves-Cintrón
- From the Department of Biomedical Sciences, Colorado State University, Fort Collins (N.L.C., A.M.F., G.C.A.); and Department of Pharmacology, University of California, Davis (M.N.-C., M.F.N.)
| | - Adriana M Fresquez
- From the Department of Biomedical Sciences, Colorado State University, Fort Collins (N.L.C., A.M.F., G.C.A.); and Department of Pharmacology, University of California, Davis (M.N.-C., M.F.N.)
| | - Manuel F Navedo
- From the Department of Biomedical Sciences, Colorado State University, Fort Collins (N.L.C., A.M.F., G.C.A.); and Department of Pharmacology, University of California, Davis (M.N.-C., M.F.N.)
| | - Gregory C Amberg
- From the Department of Biomedical Sciences, Colorado State University, Fort Collins (N.L.C., A.M.F., G.C.A.); and Department of Pharmacology, University of California, Davis (M.N.-C., M.F.N.).
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13
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Optimal microdomain crosstalk between endoplasmic reticulum and mitochondria for Ca2+ oscillations. Sci Rep 2015; 5:7984. [PMID: 25614067 PMCID: PMC4303883 DOI: 10.1038/srep07984] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 12/24/2014] [Indexed: 12/11/2022] Open
Abstract
A Ca2+ signaling model is proposed to consider the crosstalk of Ca2+ ions between endoplasmic reticulum (ER) and mitochondria within microdomains around inositol 1, 4, 5-trisphosphate receptors (IP3R) and the mitochondrial Ca2+ uniporter (MCU). Our model predicts that there is a critical IP3R-MCU distance at which 50% of the ER-released Ca2+ is taken up by mitochondria and that mitochondria modulate Ca2+ signals differently when outside of this critical distance. This study highlights the importance of the IP3R-MCU distance on Ca2+ signaling dynamics. The model predicts that when MCU are too closely associated with IP3Rs, the enhanced mitochondrial Ca2+ uptake will produce an increase of cytosolic Ca2+ spike amplitude. Notably, the model demonstrates the existence of an optimal IP3R-MCU distance (30–85 nm) for effective Ca2+ transfer and the successful generation of Ca2+ signals in healthy cells. We suggest that the space between the inner and outer mitochondria membranes provides a defense mechanism against occurrences of high [Ca2+]Cyt. Our results also hint at a possible pathological mechanism in which abnormally high [Ca2+]Cyt arises when the IP3R-MCU distance is in excess of the optimal range.
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14
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Necrostatin-1 mitigates mitochondrial dysfunction post-spinal cord injury. Neuroscience 2015; 289:224-32. [PMID: 25595990 DOI: 10.1016/j.neuroscience.2014.12.061] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 12/24/2014] [Accepted: 12/24/2014] [Indexed: 02/06/2023]
Abstract
Necrostatin-1 (Nec-1) is an inhibitor of necroptosis, playing an important role in inhibition of pathological death in the central nervous system (CNS). Our earlier study suggests that Nec-1 protects the injured spinal cord. In this study, we found that Nec-1 reduces the elevated Ca(2+) concentration in mitochondria post-injury and preserves the remarkably decreased mitochondrial membrane potential (MMP) level post-spinal cord injury (SCI). It also increases the generation of adenosine triphosphate (ATP) by promoting the activity of mitochondrial respiratory chain complex I instead of other complexes, which are significantly decreased due to the injury. Nec-1 also inhibits the release of cytochrome c in the mitochondria and protects the spinal cord from mitochondrial swelling post-SCI. Nec-1 promotes mitochondrial biogenesis by up-regulating mitochondrial transcription factor A (Tfam), in accordance with the mtDNA content. It also inhibits the up-regulation of mitochondrial fusion genes Mnf1, Mnf2 within 6h post-injury and adjusts the abnormal expression of mitochondrial fission gene Fis1. All these results indicate the improvement of mitochondrial functions in injured spinal cord after the treatment of Nec-1. This research revealed the mechanisms of functional protection of Nec-1 by mitigating mitochondrial dysfunction post-SCI.
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15
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Billaud M, Lohman AW, Johnstone SR, Biwer LA, Mutchler S, Isakson BE. Regulation of cellular communication by signaling microdomains in the blood vessel wall. Pharmacol Rev 2014; 66:513-69. [PMID: 24671377 DOI: 10.1124/pr.112.007351] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
It has become increasingly clear that the accumulation of proteins in specific regions of the plasma membrane can facilitate cellular communication. These regions, termed signaling microdomains, are found throughout the blood vessel wall where cellular communication, both within and between cell types, must be tightly regulated to maintain proper vascular function. We will define a cellular signaling microdomain and apply this definition to the plethora of means by which cellular communication has been hypothesized to occur in the blood vessel wall. To that end, we make a case for three broad areas of cellular communication where signaling microdomains could play an important role: 1) paracrine release of free radicals and gaseous molecules such as nitric oxide and reactive oxygen species; 2) role of ion channels including gap junctions and potassium channels, especially those associated with the endothelium-derived hyperpolarization mediated signaling, and lastly, 3) mechanism of exocytosis that has considerable oversight by signaling microdomains, especially those associated with the release of von Willebrand factor. When summed, we believe that it is clear that the organization and regulation of signaling microdomains is an essential component to vessel wall function.
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Affiliation(s)
- Marie Billaud
- Dept. of Molecular Physiology and Biophysics, University of Virginia School of Medicine, PO Box 801394, Charlottesville, VA 22902.
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16
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McCarron JG, Olson ML, Wilson C, Sandison ME, Chalmers S. Examining the role of mitochondria in Ca²⁺ signaling in native vascular smooth muscle. Microcirculation 2013; 20:317-29. [PMID: 23305516 PMCID: PMC3708117 DOI: 10.1111/micc.12039] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Accepted: 01/07/2013] [Indexed: 01/18/2023]
Abstract
Mitochondrial Ca2+ uptake contributes important feedback controls to limit the time course of Ca2+signals. Mitochondria regulate cytosolic [Ca2+] over an exceptional breath of concentrations (∼200 nM to >10 μM) to provide a wide dynamic range in the control of Ca2+ signals. Ca2+ uptake is achieved by passing the ion down the electrochemical gradient, across the inner mitochondria membrane, which itself arises from the export of protons. The proton export process is efficient and on average there are less than three protons free within the mitochondrial matrix. To study mitochondrial function, the most common approaches are to alter the proton gradient and to measure the electrochemical gradient. However, drugs which alter the mitochondrial proton gradient may have substantial off target effects that necessitate careful consideration when interpreting their effect on Ca2+ signals. Measurement of the mitochondrial electrochemical gradient is most often performed using membrane potential sensitive fluorophores. However, the signals arising from these fluorophores have a complex relationship with the electrochemical gradient and are altered by changes in plasma membrane potential. Care is again needed in interpreting results. This review provides a brief description of some of the methods commonly used to alter and measure mitochondrial contribution to Ca2+ signaling in native smooth muscle.
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Affiliation(s)
- John G McCarron
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK.
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17
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Amberg GC, Navedo MF. Calcium dynamics in vascular smooth muscle. Microcirculation 2013; 20:281-9. [PMID: 23384444 DOI: 10.1111/micc.12046] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Accepted: 01/31/2013] [Indexed: 12/31/2022]
Abstract
Smooth muscle cells are ultimately responsible for determining vascular luminal diameter and blood flow. Dynamic changes in intracellular calcium are a critical mechanism regulating vascular smooth muscle contractility. Processes influencing intracellular calcium are therefore important regulators of vascular function with physiological and pathophysiological consequences. In this review we discuss the major dynamic calcium signals identified and characterized in vascular smooth muscle cells. These signals vary with respect to their mechanisms of generation, temporal properties, and spatial distributions. The calcium signals discussed include calcium waves, junctional calcium transients, calcium sparks, calcium puffs, and L-type calcium channel sparklets. For each calcium signal we address underlying mechanisms, general properties, physiological importance, and regulation.
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Affiliation(s)
- Gregory C Amberg
- Vascular Physiology Research Group, Department of Biomedical Sciences, Colorado State University, Fort Collins, Colorado, USA.
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18
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Lencesova L, Hudecova S, Csaderova L, Markova J, Soltysova A, Pastorek M, Sedlak J, Wood ME, Whiteman M, Ondrias K, Krizanova O. Sulphide signalling potentiates apoptosis through the up-regulation of IP3 receptor types 1 and 2. Acta Physiol (Oxf) 2013; 208:350-61. [PMID: 23582047 DOI: 10.1111/apha.12105] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Revised: 11/15/2012] [Accepted: 04/04/2013] [Indexed: 12/14/2022]
Abstract
AIM To investigate an interaction between the calcium and sulphide signalling pathways, particularly effects of the slow H2 S release donor morpholin-4-ium-4-methoxyphenyl-(morpholino)-phosphinodithioate (GYY4137) on the expression of inositol 1,4,5-trisphosphate receptors (IP3 R) with the possible impact on the apoptosis induction in HeLa cells. METHODS Gene expression, Western blot analysis, apoptosis determination by Annexin-V-FLUOS and drop in mitochondrial membrane potential by 5,5',6,6'-tetrachloro-1,1',3,3'-tetraethylbenzimidazolyl-carbocyanine iodide (JC1) and immunofluorescence were used to determine differences in control and GYY4137-treated HeLa cells. RESULTS In HeLa cell line, GYY4137 (10 μm) up-regulated expression of the IP3 R1 and IP3 R2, but not IP3 R3 on both mRNA and protein levels. Concurrently, cytosolic calcium increased and reticular calcium was depleted in concentration-dependent manner, partially by the involvement of IP3 R. Depletion of calcium from reticulum was accompanied by increase in endoplasmic reticulum (ER) stress markers, such as X-box, CHOP and ATF4, thus pointing to the development of ER stress due to GYY4137 treatment. Also, GYY4137 treatment of HeLa cells increased the number of apoptotic cells. CONCLUSION These results suggest an involvement of H2 S in both IP3 -induced calcium signalling and induction of apoptosis, possibly through the activation of ER stress.
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Affiliation(s)
- L. Lencesova
- Institute of Molecular Physiology and Genetics; Slovak Academy of Sciences; Bratislava; Slovak Republic
| | - S. Hudecova
- Institute of Molecular Physiology and Genetics; Slovak Academy of Sciences; Bratislava; Slovak Republic
| | - L. Csaderova
- Molecular Medicine Center; Slovak Academy of Sciences; Bratislava; Slovak Republic
| | - J. Markova
- Institute of Molecular Physiology and Genetics; Slovak Academy of Sciences; Bratislava; Slovak Republic
| | - A. Soltysova
- Institute of Molecular Physiology and Genetics; Slovak Academy of Sciences; Bratislava; Slovak Republic
| | - M. Pastorek
- Cancer Research Institute; Slovak Academy of Sciences; Bratislava; Slovak Republic
| | - J. Sedlak
- Cancer Research Institute; Slovak Academy of Sciences; Bratislava; Slovak Republic
| | - M. E. Wood
- Department of Biosciences; College of Life and Environmental Sciences; University of Exeter; Exeter; UK
| | - M. Whiteman
- University of Exeter Medical School; Exeter; UK
| | - K. Ondrias
- Institute of Molecular Physiology and Genetics; Slovak Academy of Sciences; Bratislava; Slovak Republic
| | - O. Krizanova
- Institute of Molecular Physiology and Genetics; Slovak Academy of Sciences; Bratislava; Slovak Republic
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19
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Miller MW, Knaub LA, Olivera-Fragoso LF, Keller AC, Balasubramaniam V, Watson PA, Reusch JEB. Nitric oxide regulates vascular adaptive mitochondrial dynamics. Am J Physiol Heart Circ Physiol 2013; 304:H1624-33. [PMID: 23585138 PMCID: PMC3680775 DOI: 10.1152/ajpheart.00987.2012] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2012] [Accepted: 04/11/2013] [Indexed: 01/06/2023]
Abstract
Cardiovascular disease risk factors, such as diabetes, hypertension, dyslipidemia, obesity, and physical inactivity, are all correlated with impaired endothelial nitric oxide synthase (eNOS) function and decreased nitric oxide (NO) production. NO-mediated regulation of mitochondrial biogenesis has been established in many tissues, yet the role of eNOS in vascular mitochondrial biogenesis and dynamics is unclear. We hypothesized that genetic eNOS deletion and 3-day nitric oxide synthase (NOS) inhibition in rodents would result in impaired mitochondrial biogenesis and defunct fission/fusion and autophagy profiles within the aorta. We observed a significant, eNOS expression-dependent decrease in mitochondrial electron transport chain (ETC) protein subunits from complexes I, II, III, and V in eNOS heterozygotes and eNOS null mice compared with age-matched controls. In response to NOS inhibition with NG-nitro-L-arginine methyl ester (L-NAME) treatment in Sprague Dawley rats, significant decreases were observed in ETC protein subunits from complexes I, III, and IV as well as voltage-dependent anion channel 1. Decreased protein content of upstream regulators of mitochondrial biogenesis, cAMP response element-binding protein and peroxisome proliferator-activated receptor-γ coactivator-1α, were observed in response to 3-day L-NAME treatment. Both genetic eNOS deletion and NOS inhibition resulted in decreased manganese superoxide dismutase protein. L-NAME treatment resulted in significant changes to mitochondrial dynamic protein profiles with decreased fusion, increased fission, and minimally perturbed autophagy. In addition, L-NAME treatment blocked mitochondrial adaptation to an exercise intervention in the aorta. These results suggest that eNOS/NO play a role in basal and adaptive mitochondrial biogenesis in the vasculature and regulation of mitochondrial turnover.
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Affiliation(s)
- Matthew W Miller
- University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
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20
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A Special Issue on the cell-specific roles of mitochondrial Ca²⁺ handling. Pflugers Arch 2012; 464:1-2. [PMID: 22688791 DOI: 10.1007/s00424-012-1123-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Accepted: 05/29/2012] [Indexed: 10/28/2022]
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