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https://www.readbyqxmd.com/read/29036556/deficit-in-pink1-parkin-mediated-mitochondrial-autophagy-at-late-stages-of-dystrophic-cardiomyopathy
#1
Chifei Kang, Myriam A Badr, Viktoriia Kyrychenko, Eeva-Liisa Eskelinen, Natalia Shirokova
Aims: Duchenne Muscular Dystrophy (DMD) is an inherited devastating muscle disease with severe and often lethal cardiac complications. Emerging evidence suggests that the evolution of the pathology in DMD is accompanied by the accumulation of mitochondria with defective structure and function. Here we investigate whether defects in the housekeeping autophagic pathway contribute to mitochondrial and metabolic dysfunctions in dystrophic cardiomyopathy. Methods and results: We employed various biochemical and imaging techniques to assess mitochondrial structure and function as well as to evaluate autophagy, and specific mitochondrial autophagy (mitophagy), in hearts of mdx mice, an animal model of DMD...
October 5, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/29032504/resistance-exercise-improves-cardiac-function-and-mitochondrial-efficiency-in-diabetic-rat-hearts
#2
Tae Hee Ko, Jubert C Marquez, Hyoung Kyu Kim, Seung Hun Jeong, SungRyul Lee, Jae Boum Youm, In Sung Song, Dae Yun Seo, Hye Jin Kim, Du Nam Won, Kyoung Im Cho, Mun Gi Choi, Byoung Doo Rhee, Kyung Soo Ko, Nari Kim, Jong Chul Won, Jin Han
Metabolic disturbance and mitochondrial dysfunction are a hallmark of diabetic cardiomyopathy (DC). Resistance exercise (RE) not only enhances the condition of healthy individuals but could also improve the status of those with disease. However, the beneficial effects of RE in the prevention of DC and mitochondrial dysfunction are uncertain. Therefore, this study investigated whether RE attenuates DC by improving mitochondrial function using an in vivo rat model of diabetes. Fourteen Otsuka Long-Evans Tokushima Fatty rats were assigned to sedentary control (SC, n = 7) and RE (n = 7) groups at 28 weeks of age...
October 14, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/29024001/dynamin-related-protein-1-mediated-mitochondrial-fission-contributes-to-post-traumatic-cardiac-dysfunction-in-rats-and-the-protective-effect-of-melatonin
#3
Mingge Ding, Jiao Ning, Na Feng, Zeyang Li, Zhenhua Liu, Yuanbo Wang, Yueming Wang, Xing Li, Cong Huo, Xin Jia, Rong Xu, Feng Fu, Xiaoming Wang, Jianming Pei
Mechanical trauma (MT) causes myocardial injury and cardiac dysfunction. However, the underlying mechanism remains largely unclear. This study investigated the role of mitochondrial dynamics in post-traumatic cardiac dysfunction and the protective effects of melatonin. Adult male Sprague Dawley rats were subjected to 5-minute rotations (200 revolutions at a rate of 40 rpm) to induce MT model. Melatonin was administrated intraperitoneally 5 minute after MT. Mitochondrial morphology, myocardial injury, and cardiac function were determined in vivo...
October 11, 2017: Journal of Pineal Research
https://www.readbyqxmd.com/read/29023512/the-ultrastructural-characteristics-of-porcine-hepatocytes-donated-after-cardiac-death-and-preserved-with-warm-machine-perfusion-preservation
#4
Hiroki Bochimoto, Naoto Matsuno, Yo Ishihara, Tatsuya Shonaka, Daisuke Koga, Yoshiki Hira, Yuji Nishikawa, Hiroyuki Furukawa, Tsuyoshi Watanabe
The effects of warm machine perfusion preservation of liver grafts donated after cardiac death on the intracellular three-dimensional ultrastructure of the organelles in hepatocytes remain unclear. Here we analyzed comparatively the ultrastructure of the endomembrane systems in porcine hepatocytes under warm ischemia and successive hypothermic and midthermic machine perfusion preservation, a type of the warm machine perfusion. Porcine liver grafts which had a warm ischemia time of 60 minutes were perfused for 4 hours with modified University of Wisconsin gluconate solution...
2017: PloS One
https://www.readbyqxmd.com/read/29021295/mitochondrial-cardiomyopathy-caused-by-elevated-reactive-oxygen-species-and-impaired-cardiomyocyte-proliferation
#5
Donghui Zhang, Yifei Li, Danielle A Heims-Waldron, Vassilios J Bezzerides, Silvia Guatimosim, Yuxuan Guo, Fei Gu, Pingzhu Zhou, Zhiqiang Lin, Qing Ma, Jianming Liu, Da-Zhi Wang, William T Pu
Rationale: Although mitochondrial diseases often cause abnormal myocardial development, the mechanisms by which mitochondria influence heart growth and function are poorly understood. Objective: To investigate these disease mechanisms, we studied a genetic model of mitochondrial dysfunction caused by inactivation of Tfam (Transcription Factor A, Mitochondrial), a nuclear-encoded gene that is essential for mitochondrial gene transcription and mitochondrial DNA replication. Methods and Results:Tfam inactivation by Nkx2...
October 11, 2017: Circulation Research
https://www.readbyqxmd.com/read/29017650/-effect-of-dynamin-related-protein-1-in-rats-with-myocardial-ischemia-reperfusion-injury
#6
Yanli Yang, Jun Ma, Duomao Lin
OBJECTIVE: To investigate the protective effect of dynamin-related protein 1 (Drp1) in rats with myocardial ischemia/reperfusion injury (IRI). METHODS: Twenty-four healthy male Wistar rats were randomly divided into three groups (n = 8 each): sham group, IRI model group, and Drp1 inhibitor group. The left anterior descending branch of coronary artery was ligated to produce myocardial ischemia for 30 minutes and reperfusion injury model. Sham group was received only threading without ligation...
October 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28993115/recurrent-exposure-to-ferric-oxide-nanoparticles-alters-myocardial-oxidative-stress-apoptosis-and-necrotic-markers-in-male-mice
#7
Vijayprakash Manickam, Madhivadhani Periyasamy, Vasanth Dhakshinamoorthy, Lakshmikanthan Panneerselvam, Ekambaram Perumal
The cardiotoxicity of iron oxide nanoparticles (Fe2O3-NPs) in mice was investigated. The mice were intraperitoneally administered with Fe2O3-NPs at the dose of 25 and 50 mg/kg bw for 30 days at seven days interval. In vivo MRI analysis reveals the Fe2O3-NPs accumulation in the cardiac system. Also, serum iron estimation and Prussian blue staining confirms the iron deposition in circulatory system. Cardiac dysfunction was assessed by ECG analysis and further validated by evaluating the functional markers such as cardiac Troponin-1 (cTnI) expression, AChE activity and levels of LDH and CK-MB in cardiac tissue...
October 6, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28982073/cardiac-specific-inactivation-of-lpp3-in-mice-leads-to-myocardial-dysfunction-and-heart-failure
#8
Mini Chandra, Diana Escalante-Alcalde, Md Shenuarin Bhuiyan, Anthony Wayne Orr, Christopher Kevil, Andrew J Morris, Hyung Nam, Paari Dominic, Kevin J McCarthy, Sumitra Miriyala, Manikandan Panchatcharam
Lipid Phosphate phosphatase 3 (LPP3), encoded by the Plpp3 gene, is an enzyme that dephosphorylates the bioactive lipid mediator lysophosphatidic acid (LPA). To study the role of LPP3 in the myocardium, we generated a cardiac specific Plpp3 deficient mouse strain. Although these mice were viable at birth in contrast to global Plpp3 knockout mice, they showed increased mortality ~ 8 months. LPP3 deficient mice had enlarged hearts with reduced left ventricular performance as seen by echocardiography. Cardiac specific Plpp3 deficient mice had longer ventricular effective refractory periods compared to their Plpp3 littermates...
September 28, 2017: Redox Biology
https://www.readbyqxmd.com/read/28980297/remote-ischemic-preconditioning-of-human-myocardium-ripe-study-protocol-for-a-double-blinded-randomized-controlled-trial
#9
Marek A Deja, Ryszard Wiaderkiewicz, Piotr Czekaj, Ewa Czech, Marcin Malinowski, Leszek Machej, Andrzej Węglarzy, Adam Kowalówka, Magda Piekarska, Bartosz Szurlej, Tomasz Latusek
BACKGROUND: Remote preconditioning was showed to be a potent protective phenomenon in many animals. Several studies aimed to demonstrate it was feasible in humans by trying to show its protective effect during cardiac surgery. Of these studies some small studies and one bigger trial were positive while two other bigger studies showed no effectiveness of remote preconditioning as assessed by levels of postoperatively released cardiac markers. Recently two large clinical trials also failed to prove the benefit of remote preconditioning in cardiac surgery...
October 5, 2017: Kardiologia Polska
https://www.readbyqxmd.com/read/28972174/sirtuin-5-is-required-for-mouse-survival-in-response-to-cardiac-pressure-overload
#10
Kathleen A Hershberger, Dennis M Abraham, Angelical S Martin, Lan Mao, Juan Liu, Hongbo Gu, Jason W Locasale, Matthew D Hirschey
In mitochondria, the sirtuin SIRT5 is an NAD(+)-dependent protein deacylase that controls several metabolic pathways. While a wide range of SIRT5 targets has been identified, the overall function of SIRT5 in organismal metabolic homeostasis remains unclear. Given that SIRT5 expression is highest in the heart and that sirtuins are commonly stress-response proteins, we used an established model of pressure overload-induced heart muscle hypertrophy caused by transverse aortic constriction (TAC) to determine SIRT5's role in cardiac stress responses...
October 2, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28954833/reactive-oxygen-species-signalling-in-the-diabetic-heart-emerging-prospect-for-therapeutic-targeting
#11
REVIEW
Adam J Wilson, Eleanor K Gill, Rawan A Abudalo, Kevin S Edgar, Chris J Watson, David J Grieve
Despite being first described 45 years ago, the existence of a distinct diabetic cardiomyopathy remains controversial. Nonetheless, it is widely accepted that the diabetic heart undergoes characteristic structural and functional changes in the absence of ischaemia and hypertension, which are independently linked to heart failure progression and are likely to underlie enhanced susceptibility to stress. A prominent feature is marked collagen accumulation linked with inflammation and extensive extracellular matrix changes, which appears to be the main factor underlying cardiac stiffness and subclinical diastolic dysfunction, estimated to occur in as many as 75% of optimally controlled diabetics...
September 27, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28954424/mitochondriotropic-and-cardioprotective-effects-of-triphenylphosphonium-conjugated-derivatives-of-the-diterpenoid-isosteviol
#12
Lara Testai, Irina Strobykina, Victor V Semenov, Marina Semenova, Eleonora Da Pozzo, Alma Martelli, Valentina Citi, Claudia Martini, Maria C Breschi, Vladimir E Kataev, Vincenzo Calderone
Mitochondria play a crucial role in the cell fate; in particular, reducing the accumulation of calcium in the mitochondrial matrix offers cardioprotection. This affect is achieved by a mild depolarization of the mitochondrial membrane potential, which prevents the assembly and opening of the mitochondrial permeability transition pore. For this reason, mitochondria are an attractive target for pharmacological interventions that prevent ischaemia/reperfusion injury. Isosteviol is a diterpenoid created from the acid hydrolysis of Steviarebaudiana Bertoni (fam...
September 26, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28952264/-protective-effect-of-total-saponins-of-panax-notoginseng-combined-with-total-flavonoids-of-epimedium-on-d-galactose-incuced-senescence-of-h9c2-cell
#13
Jin Li, Li-Li Deng, Zhi-Yong Zhou, Ding Yuan, Chang-Cheng Zhang, Ting Wang
To investigate the protective effect of Panax notoginseng saponins combined with total flavonoids of epimedium on D-gal-induced senescence of H9c2 cells and explore its underlying mechanisms. The 50 mol•L⁻¹ D-gal was used to induce H9c2 cells senescence. Different concentrations of TPNS, TFE, and TPNS combined with TFE were used for 4 hours for pre-treatment. D-gal was used to stimulate H9c2 cardiac muscle cells for 24 h. Then in order to determine the best combined scheme, MTT was used to detect cell viability...
February 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28949928/second-messenger-signaling-mechanisms-of-the-brown-adipocyte-thermogenic-program-an-integrative-perspective
#14
REVIEW
Fubiao Shi, Sheila Collins
β-adrenergic receptors (βARs) are well established for conveying the signal from catecholamines to adipocytes. Acting through the second messenger cyclic adenosine monophosphate (cAMP) they stimulate lipolysis and also increase the activity of brown adipocytes and the 'browning' of adipocytes within white fat depots (so-called 'brite' or 'beige' adipocytes). Brown adipose tissue mitochondria are enriched with uncoupling protein 1 (UCP1), which is a regulated proton channel that allows the dissipation of chemical energy in the form of heat...
September 26, 2017: Hormone Molecular Biology and Clinical Investigation
https://www.readbyqxmd.com/read/28942573/berberine-inhibits-oxygen-consumption-rate-independent-of-alteration-in-cardiolipin-levels-in-h9c2-cells
#15
Wenguang Chang, Ming Zhang, Li Chen, Grant M Hatch
Small clinical studies have shown that oral treatment with the plant alkaloid berberine (BBR) reduces blood glucose levels similar to that of metformin and have promoted its use as a novel anti-diabetic therapy. However, in vitro studies have shown that high concentrations of BBR potently inhibit cell proliferation through inhibition of mitochondrial function. Cardiolipin (Ptd2Gro) is a key phospholipid required for regulating mitochondrial bioenergetic function. We examined if BBR inhibited oxygen consumption rate in H9c2 cardiac myocytes through alteration in Ptd2Gro metabolism...
September 23, 2017: Lipids
https://www.readbyqxmd.com/read/28942427/binding-of-fundc1-with-inositol-1-4-5-trisphosphate-receptor-in-mitochondria-associated-endoplasmic-reticulum-er-membranes-maintains-mitochondrial-dynamics-and-function-in-hearts-in-vivo
#16
Shengnan Wu, Qiulun Lu, Qilong Wang, Ye Ding, Zejun Ma, Xiaoxiang Mao, Kai Huang, Zhonglin Xie, Ming-Hui Zou
Background -FUN14 domain containing 1 (FUNDC1) is a highly conserved outer mitochondrial membrane protein. The aim of this study is to examine if FUNDC1 modulates the mitochondria-associated endoplasmic reticulum (ER) membranes (MAMs), mitochondrial morphology, and function in cardiomyocytes and in intact hearts. Methods -The impacts of FUNDC1 on MAMs formation and cardiac functions were studied in mouse neonatal cardiomyocytes, in mice with cardiomyocyte-specific Fundc1 gene knockout (Fundc1(f/Y)/Cre(αMyHC+/-) ), and in the cardiac tissues of the patients with heart failure...
September 23, 2017: Circulation
https://www.readbyqxmd.com/read/28942281/antihypertrophic-effects-of-small-molecules-that-maintain-mitochondrial-atp-levels-under-hypoxia
#17
Hiroaki Nagai, Tomoko Satomi, Akiko Abiru, Kazumasa Miyamoto, Koji Nagasawa, Minoru Maruyama, Satoshi Yamamoto, Kuniko Kikuchi, Hiromitsu Fuse, Masakuni Noda, Yoshiyuki Tsujihata
Since impaired mitochondrial ATP production in cardiomyocytes is thought to lead to heart failure, a drug that protects mitochondria and improves ATP production under disease conditions would be an attractive treatment option. In this study, we identified small-molecule drugs, including the anti-parasitic agent, ivermectin, that maintain mitochondrial ATP levels under hypoxia in cardiomyocytes. Mechanistically, transcriptomic analysis and gene silencing experiments revealed that ivermectin increased mitochondrial ATP production by inducing Cox6a2, a subunit of the mitochondrial respiratory chain...
September 19, 2017: EBioMedicine
https://www.readbyqxmd.com/read/28941171/roles-of-mitochondrial-dynamics-modulators-in-cardiac-ischaemia-reperfusion-injury
#18
REVIEW
Chayodom Maneechote, Siripong Palee, Siriporn C Chattipakorn, Nipon Chattipakorn
The current therapeutic strategy for the management of acute myocardial infarction (AMI) is to return blood flow into the occluded coronary artery of the heart, a process defined as reperfusion. However, reperfusion itself can increase mortality rates in AMI patients because of cardiac tissue damage and dysfunction, which is termed 'ischaemia/reperfusion (I/R) injury'. Mitochondria play an important role in myocardial I/R injury as disturbance of mitochondrial dynamics, especially excessive mitochondrial fission, is a predominant cause of cardiac dysfunction...
September 22, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28931882/honokiol-protects-against-doxorubicin-cardiotoxicity-via-improving-mitochondrial-function-in-mouse-hearts
#19
Lizhen Huang, Kailiang Zhang, Yingying Guo, Fengyuan Huang, Kevin Yang, Long Chen, Kai Huang, Fengxue Zhang, Qinqiang Long, Qinglin Yang
Honokiol is a key component of a medicinal herb, Magnolia bark. Honokiol possesses potential pharmacological benefits for many disease conditions, especially cancer. Recent studies demonstrate that Honokiol exerts beneficial effects on cardiac hypertrophy and doxorubicin (Dox)-cardiotoxicity via deacetylation of mitochondrial proteins. However, the effects and mechanisms of Honokiol on cardiac mitochondrial respiration remain unclear. In the present study, we investigate the effect of Honokiol on cardiac mitochondrial respiration in mice subjected to Dox treatment...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28923249/akap-lbc-mediates-protection-against-doxorubicin-induced-cardiomyocyte-toxicity
#20
Stefania Caso, Darko Maric, Miroslav Arambasic, Susanna Cotecchia, Dario Diviani
Doxorubicin (DOX) is a chemotherapic agent that is widely used to treat hematological and solid tumors. Despite its efficacy, DOX displays significant cardiac toxicity associated with cardiomyocytes death and heart failure. Cardiac toxicity is mainly associated with the ability of DOX to alter mitochondrial function. The current lack of treatments to efficiently prevent DOX cardiotoxicity underscores the need of new therapeutic approaches. Our current findings show that stimulation of cardiomyocytes with the α1-adrenergic receptor (AR) agonist phenylephrine (PE) significantly inhibits the apoptotic effect of DOX...
September 18, 2017: Biochimica et Biophysica Acta
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