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https://www.readbyqxmd.com/read/29323106/sequential-forward-and-reverse-transport-of-the-na-ca2-exchanger-generates-ca2-oscillations-within-mitochondria
#1
Krishna Samanta, Gary R Mirams, Anant B Parekh
Mitochondrial Ca2+ homoeostasis regulates aerobic metabolism and cell survival. Ca2+ flux into mitochondria is mediated by the mitochondrial calcium uniporter (MCU) channel whereas Ca2+ export is often through an electrogenic Na+-Ca2+ exchanger. Here, we report remarkable functional versatility in mitochondrial Na+-Ca2+ exchange under conditions where mitochondria are depolarised. Following physiological stimulation of cell-surface receptors, mitochondrial Na+-Ca2+ exchange initially operates in reverse mode, transporting cytosolic Ca2+ into the matrix...
January 11, 2018: Nature Communications
https://www.readbyqxmd.com/read/29312734/posterior-uniportal-video-assisted-thoracoscopic-surgery-for-anatomical-lung-resections
#2
Davor Stamenovic, Korkut Bostanci, Antje Messerschmidt
Background: The acceptance of uniportal video-assisted thoracoscopic surgery (uVATS) for anatomical lung resections has been growing in recent years. This study presents the first case-series in the literature with posterior uVATS (puVATS) technique for specific anatomical lung resections. Methods: The first 20 consecutive patients who underwent an anatomical lung resection by a single surgeon, by means of puVATS technique were evaluated in terms of pre-, peri- and post-operative results...
December 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29312697/tubeless-uniportal-carinal-right-upper-lobectomy
#3
EDITORIAL
Douglas J Mathisen
No abstract text is available yet for this article.
December 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29286188/the-mitochondrial-calcium-uniporter-complex-in-trypanosomes
#4
REVIEW
Noelia Lander, Miguel A Chiurillo, Mayara S Bertolini, Roberto Docampo, Aníbal E Vercesi
The presence of a conserved mechanism for mitochondrial calcium uptake in trypanosomatids was crucial for the molecular identification of the mitochondrial calcium uniporter (MCU), a long-sought channel present in most eukaryotic organisms. Since then, research efforts to elucidate the role of MCU and its regulatory elements in different biological models have multiplied. MCU is the pore-forming subunit of a multimeric complex (the MCU complex or MCUC) and its predicted structure in trypanosomes is simpler than in mammalian cells, lacking two of its subunits and probably possessing other unidentified components...
December 29, 2017: Cell Biology International
https://www.readbyqxmd.com/read/29241542/micu2-restricts-spatial-crosstalk-between-insp3r-and-mcu-channels-by-regulating-threshold-and-gain-of-micu1-mediated-inhibition-and-activation-of-mcu
#5
Riley Payne, Henry Hoff, Anne Roskowski, J Kevin Foskett
Ca2+ entry into mitochondria is mediated by the Ca2+ uniporter-channel complex containing MCU, the Ca2+-selective pore, and associated regulatory proteins. The roles of MICU proteins are controversial. MICU1 was proposed to be necessary for MCU activity, whereas subsequent studies suggested it inhibits the channel in the low-cytoplasmic Ca2+ ([Ca2+]c) regime, a mechanism referred to as "gatekeeping," that imposes a [Ca2+]c threshold for channel activation at ∼1-3 μM. Here, we measured MCU activity over a wide range of quantitatively controlled and recorded [Ca2+]c...
December 12, 2017: Cell Reports
https://www.readbyqxmd.com/read/29237825/mitochondrial-ca2-transport-in-the-endothelium-regulation-by-ions-redox-signalling-and-mechanical-forces
#6
REVIEW
B Rita Alevriadou, Santhanam Shanmughapriya, Akshar Patel, Peter B Stathopulos, Muniswamy Madesh
Calcium (Ca2+) transport by mitochondria is an important component of the cell Ca2+ homeostasis machinery in metazoans. Ca2+ uptake by mitochondria is a major determinant of bioenergetics and cell fate. Mitochondrial Ca2+ uptake occurs via the mitochondrial Ca2+ uniporter (MCU) complex, an inner mitochondrial membrane protein assembly consisting of the MCU Ca2+ channel, as its core component, and the MCU complex regulatory/auxiliary proteins. In this review, we summarize the current knowledge on the molecular nature of the MCU complex and its regulation by intra- and extramitochondrial levels of divalent ions and reactive oxygen species (ROS)...
December 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/29225050/inhibition-of-the-mitochondrial-calcium-uniporter-prevents-il-13-and-allergen-mediated-airway-epithelial-apoptosis-and-loss-of-barrier-function
#7
Sara C Sebag, Olha M Koval, John D Paschke, Christopher J Winters, Alejandro P Comellas, Isabella M Grumbach
Mitochondria are increasingly recognized as key mediators of acute cellular stress responses in asthma. However, the distinct roles of regulators of mitochondrial physiology on allergic asthma phenotypes are currently unknown. The mitochondrial Ca2+ uniporter (MCU) resides in the inner mitochondrial membrane and controls mitochondrial Ca2+ uptake into the mitochondrial matrix. To understand the function of MCU in models of allergic asthma, in vitro and in vivo studies were performed using models of functional deficiency or knockout of MCU...
December 7, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/29221311/uniportal-video-assisted-thoracic-surgery-lobectomy-in-a-patient-with-carcinoid-tumor-located-at-the-orifice-of-the-right-lower-lobe
#8
Semih Halezeroğlu
We present here a 47-year old male patient who had a typical carcinoid tumor located at the orifice of right lower lobe bronchus underwent uniportal thoracoscopic lower lobectomy following bronchoscopic removal of the endobronchial tumor. Tumor was seen by bronchoscopy to protrude out from the lower lobe into the intermediary bronchus obstructing the lower lobe completely and the middle lob partially. However, the origin of the endobronchial tumor was in the distal part of the lower lobe bronchus. In this case, open surgery could be an alternative to save the middle lobe by incising the lower lobe bronchus to pull out the endobronchial tumor first during thoracotomy...
September 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29221310/uniportal-video-assisted-thoracoscopic-surgery-left-upper-lobe-trisegmentectomy-using-flexible-tip-3d-video-scope
#9
Mathew Thomas
A 69-year-old male patient with a history of melanoma and prostate cancer was found to have a 2.6 cm PET-avid, slowly enlarging, left upper lobe lung nodule that was suspicious for either metastasis or primary lung cancer. Due to the deep location of the nodule, a wedge resection was not recommended. A diagnostic and therapeutic uniportal video-assisted thoracoscopic surgery (U-VATS) left upper lobe trisegmentectomy was performed uneventfully. Final pathology confirmed the presence of metastasis from prostate cancer without lymph node involvement...
September 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29221309/uniportal-video-assisted-thoracoscopic-right-upper-posterior-segmentectomy-with-systematic-mediastinal-lymphadenectomy
#10
Guofei Zhang, Zhijun Wu, Yimin Wu, Gang Shen, Ying Chai
Uniportal video-assisted thoracoscopic surgery (VATS) has now evolved into a sophisticated technique that can be used in some of the most complex thoracic procedures; however, this approach to segmentectomy is not standardized, and the surgical procedure varies between surgeons. Here, we describe the use of our uniportal VATS procedure during right upper posterior segmentectomy in a patient with a nodule in the right upper lobe. Subsequent mediastinal lymphadenectomy was performed. The patient has recovered well after surgery...
September 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29221306/systemic-tunnel-dissection-of-mediastinal-lymph-nodes-without-clamping-via-uniportal-video-assisted-thoracoscopic-surgery
#11
Jia-Tao Zhang, Song Dong, Xue-Ning Yang, Yi-Long Wu, Wen-Zhao Zhong
Here we introduce a manual tunnel approach to remove the mediastinal lymph nodes and highlight the conception of non-clamping during dissection. We describe two cases of pulmonary malignancy performing a strategic lobectomy and systemic dissection of mediastinal lymph nodes via single port. The technique of tunnel dissection without clamping ensure to satisfy the requirement of oncology and clinical criteria. By efficiently specifying surgery procedure and improving dissection thoroughness, our approach should be implemented...
September 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29221305/left-upper-lobectomy-and-pulmonary-angioplasty-by-uniportal-video-assisted-thoracic-surgery
#12
Kaihua Tian, Ronghua Yang, Bin Han
Diego Gonzalez-Rivas and his colleagues performed the first case for pulmonary major resection by the uniportal approach in 2010. In the following years, more and more expert surgeons developed the uniportal approach and even applied it to very complex cases. Many centers have showed that uniportal video-assisted thoracic surgery (VATS) lobectomy is a safe and feasible technique. The patient presented here is a complex case: The lingular segmental artery was invaded seriously by the tumor and it was difficult to divide it freely, and the pulmonary artery plasty was needed...
September 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29210126/crosslink-of-calcium-and-sodium-signalling-in-health-and-disease
#13
Alexei Verkhratsky, Mohamed Trebak, Fabiana Perocchi, Daniel Khananishvili, Israel Sekler
Transmembrane ionic gradients, that are indispensable feature of life, are utilised for generation of cytosolic ionic signals that regulate a host of cellular functions. Intracellular signalling mediated by Ca2+ and Na+ is tightly linked through several molecular pathways that generate Ca2+ and Na+ fluxes and are in turn regulated by both ions. Transient receptor potential (TRP) channels bridge endoplasmic reticulum Ca2+ release with generation of Na+ and Ca2+ currents. Plasmalemmal Na+ /Ca2+ exchanger by flickering between forward and reverse mode coordinates influx and efflux of both ions with membrane polarisation and cytosolic ion concentration...
December 6, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29207638/jolkinolide-b-induces-apoptosis-of-colorectal-carcinoma-through-ros-er-stress-ca2-mitochondria-dependent-pathway
#14
Jing Zhang, Yang Wang, Ye Zhou, Qing-Yu He
Colorectal carcinoma (CRC) remains one of the leading causes of death in cancer-related diseases. In this study, we aimed to investigate the anticancer effect of Jolkinolide B (JB), a bioactive diterpenoid component isolated from the dried roots of Euphorbia fischeriana Steud, on CRC cells and its underlying mechanisms. We found that JB suppressed the cell viability and colony formation of CRC cells, HT29 and SW620. Annexin V/PI assay revealed that JB induced apoptosis in CRC cells, which was further confirmed by the increased expression of cleaved-caspase3 and cleaved-PARP...
October 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/29204122/letm1-mediated-k-and-na-homeostasis-regulates-mitochondrial-ca2-efflux
#15
Shane Austin, Mojtaba Tavakoli, Christina Pfeiffer, Julia Seifert, Andrea Mattarei, Diego De Stefani, Mario Zoratti, Karin Nowikovsky
HIGHLIGHTS Monovalent cation homeostasis is dysregulated upon LETM1 depletionK+/H+ exchange activity is decreased in LETM1 knockdown cellsLETM1 depletion results in K+ accumulation in the mitochondrial matrixLETM1 knockdown does not affect expression of major mitochondrial Ca2+ transport modulatorsLETM1-regulated mitochondrial Ca2+ fluxes are dependent on Na+ Ca2+ transport across the inner membrane of mitochondria (IMM) is of major importance for their functions in bioenergetics, cell death and signaling. It is therefore tightly regulated...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29142021/inf2-mediated-actin-polymerization-at-the-er-stimulates-mitochondrial-calcium-uptake-inner-membrane-constriction-and-division
#16
Rajarshi Chakrabarti, Wei-Ke Ji, Radu V Stan, Jaime de Juan Sanz, Timothy A Ryan, Henry N Higgs
Mitochondrial division requires division of both the inner and outer mitochondrial membranes (IMM and OMM, respectively). Interaction with endoplasmic reticulum (ER) promotes OMM division by recruitment of the dynamin Drp1, but effects on IMM division are not well characterized. We previously showed that actin polymerization through ER-bound inverted formin 2 (INF2) stimulates Drp1 recruitment in mammalian cells. Here, we show that INF2-mediated actin polymerization stimulates a second mitochondrial response independent of Drp1: a rise in mitochondrial matrix calcium through the mitochondrial calcium uniporter...
November 15, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/29137386/mitochondrial-calcium-uniporter-as-a-target-of-microrna-340-and-promoter-of-metastasis-via-enhancing-the-warburg-effect
#17
Changhui Yu, Yuhao Wang, Jiawen Peng, Qiang Shen, Mimi Chen, Wei Tang, Xiumei Li, Chunqing Cai, Bin Wang, Shaoxi Cai, Xiaojing Meng, Fei Zou
Background: A shift from oxygen phosphorylation to aerobic glycolysis was known as the Warburg effect and a characteristic of cancer cell metabolism facilitating metastasis. Mitochondrial calcium uniporter (MCU), a key ion channel that mediates Ca(2+) uptake into mitochondria, was found to promote cancer progression and metastasis. However, its explicit role in shifting metabolism of breast cancer cells has not been defined. Methods: We evaluated MCU overexpression or knock-down on migration, invasion and glucose metabolismin breast cancer cells...
October 13, 2017: Oncotarget
https://www.readbyqxmd.com/read/29082850/subxiphoid-uniportal-video-assisted-thoracoscopic-surgery-for-synchronous-bilateral-lung-resection
#18
Xueying Yang, Linlin Wang
OBJECTIVES: With advancements in medical imaging and current emphasis on regular physical examinations, multiple pulmonary lesions increasingly are being detected, including bilateral pulmonary lesions. Video-assisted thoracic surgery is an important method for treating such lesions. Most of video-assisted thoracic surgeries for bilateral pulmonary lesions were two separate operations. Herein, we report a novel technique of synchronous subxiphoid uniportal video-assisted thoracic surgery for bilateral pulmonary lesions...
October 30, 2017: Postgraduate Medicine
https://www.readbyqxmd.com/read/29078698/needlescopic-assisted-uniportal-video-assisted-thoracoscopic-pulmonary-anatomical-segmentectomy
#19
Shun-Mao Yang, Wen-Ting Wu, Yu-Hsuan Liu, Huan-Jang Ko
BACKGROUND: Pulmonary segmentectomy can be an oncologic equivalent of lobectomy for small non-small cell lung cancer. Uniportal video-assisted thoracoscopic surgery (VATS) has recently showed favorable surgical outcomes, but remains technical demanding, especially in a complex procedure like anatomic segmentectomy. This manuscript demonstrates the surgical techniques for uniportal VATS segmentectomies with the assistance of additional needlescopic instruments. METHODS: Data of 22 consecutive patients who underwent 24 needlescopic-assisted uniportal VATS segmentectomies between December 2016 and June 2017 was analyzed...
2017: Journal of Visualized Surgery
https://www.readbyqxmd.com/read/29078686/uniportal-video-assisted-thoracoscopic-surgery-in-hemothorax
#20
REVIEW
Stefano Sanna, Luca Bertolaccini, Jury Brandolini, Desideria Argnani, Marta Mengozzi, Alessandro Pardolesi, Piergiorgio Solli
The management of hemothorax (spontaneous or, more often, due to thoracic trauma lesions), follows basic tenets well-respected by cardiothoracic surgeons. In most, a non-operative approach is adequate and safe, with a defined group of patients requiring only tube thoracostomy. Only a minority of patients need a surgical intervention due to retained hemothorax, persistent bleeding or incoming complications, as pleural empyema or entrapped lung. In the early 1990s, the rapid technological developments determined an increase of diagnostic and therapeutical indications for multiport video-assisted thoracoscopic surgery (VATS) as the gold standard therapy for retained and persistent hemothorax, allowing an earlier diagnosis, total clots removal and better tubes placement with less morbidity, reduced post-operative pain and shorter hospital stay...
2017: Journal of Visualized Surgery
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