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https://www.readbyqxmd.com/read/28934520/damage-of-inner-ear-sensory-hair-cells-via-mitochondrial-loss-in-a-murine-model-of-sleep-apnea-with-chronic-intermittent-hypoxia
#1
Young Joon Seo, Hyun Mi Ju, Sun Hee Lee, Sang Hyun Kwak, Min Jung Kang, Joo-Heon Yoon, Chang-Hoon Kim, Hyung-Ju Cho
Study Objectives: Investigating the exact pathophysiology of obstructive sleep apnea syndrome (OSAS)-induced hearing loss is critical. We sought to verify the hypothesis that a correlation exists between mitochondrial dysfunction in inner ear hair cells and the auditory dysfunction induced by chronic intermittent hypoxia (CIH) in a murine model of sleep apnea. Methods: C57BL/6J adult male mice were randomized to 4 weeks of CIH (n = 12) or normoxia (Sham) (n = 12)...
September 1, 2017: Sleep
https://www.readbyqxmd.com/read/28931237/histone-methyltransferase-set8-epigenetically-reprograms-host-immune-responses-to-assist-mycobacterial-survival
#2
Vikas Singh, Praveen Prakhar, R S Rajmani, Kasturi Mahadik, Salik Miskat Borbora, Kithiganahalli Narayanaswamy Balaji
NQO1 and TRXR1 are important host reductases implicated in the regulation of inflammation and apoptosis. Although the transcriptional machinery governing these processes have been extensively investigated, the associated epigenetic regulatory events remain unclear. Here, we report that SET8, a histone H4 lysine 20 monomethylase (H4K20me1), is highly induced during Mycobacterium tuberculosis infection that orchestrates immune evasion strategies through the induction of NQO1 and TRXR1 in vivo. SET8, along with FoxO3a, mediates an active NQO1-PGC1-α complex, which promotes the anti-inflammatory M2 macrophage phenotype, and assists TRXR1-regulated arrest of tumor necrosis factor-related apoptosis-inducing ligand-induced apoptosis...
August 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28860475/long-term-pgc1%C3%AE-overexpression-leads-to-apoptosis-autophagy-and-muscle-wasting
#3
Danesh H Sopariwala, Vikas Yadav, Pierre-Marie Badin, Neah Likhite, Megha Sheth, Sabina Lorca, Isabelle K Vila, Eun Ran Kim, Qingchun Tong, Min Sup Song, George G Rodney, Vihang A Narkar
Skeletal muscle wasting is prevalent in many chronic diseases, necessitating inquiries into molecular regulation of muscle mass. Nuclear receptor co-activator peroxisome proliferator-activated receptor co-activator 1 alpha (PGC1α) and its splice variant PGC1α4 increase skeletal muscle mass. However, the effect of the other PGC1 sub-type, PGC1β, on muscle size is unclear. In transgenic mice selectively over-expressing PGC1β in the skeletal muscle, we have found that PGC1β progressively decreases skeletal muscle mass predominantly associated with loss of type 2b fast-twitch myofibers...
August 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28827782/extracellular-calcium-modulates-brown-adipocyte-differentiation-and-identity
#4
Ines Pramme-Steinwachs, Martin Jastroch, Siegfried Ussar
Brown adipocytes are important in regulating non-shivering thermogenesis, whole body glucose and lipid homeostasis. Increasing evidence supports an important role of metabolites as well as macro- and micronutrients in brown adipocyte differentiation and function. Calcium is one of the most abundant ions in the body regulating multiple cellular processes. We observed that increasing extracellular calcium concentration during brown adipocyte differentiation blocks lipid accumulation and suppresses induction of major adipogenic transcription factors such as PPARγ and C/EBPα...
August 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28763300/ablation-of-adipose-ho-1-expression-increases-white-fat-over-beige-fat-through-inhibition-of-mitochondrial-fusion-and-of-pgc1%C3%AE-in-female-mice
#5
Shailendra P Singh, Ilana Grant, Aliza Meissner, Attallah Kappas, Nader G Abraham
Background Hmox1 plays an important role in the regulation of mitochondrial bioenergetics and function by regulating cellular heme-derived CO and bilirubin. Previous studies have demonstrated that global disruption of HO-1 in humans and mice resulted in severe organ dysfunction. Methods We investigated the potential role of adipose-specific-HO-1 genetic ablation on adipose tissue function, mitochondrial quality control and energy expenditure by generating an adipo-HO-1 knockout mouse model (Adipo-HO-1-/-) and, in vitro, adipocyte cells in which HO activity was inhibited...
August 1, 2017: Hormone Molecular Biology and Clinical Investigation
https://www.readbyqxmd.com/read/28740336/expression-and-role-of-nuclear-receptor-coregulators-in-colorectal-cancer
#6
REVIEW
Mouna Triki, Marion Lapierre, Vincent Cavailles, Raja Mokdad-Gargouri
Colorectal cancer (CRC) is one of the most common human cancers and the cause of about 700000 deaths per year worldwide. Deregulation of the WNT/β-catenin pathway is a key event in CRC initiation. This pathway interacts with other nuclear signaling pathways, including members of the nuclear receptor superfamily and their transcription coregulators. In this review, we provide an overview of the literature dealing with the main coactivators (NCoA-1 to 3, NCoA-6, PGC1-α, p300, CREBBP and MED1) and corepressors (N-CoR1 and 2, NRIP1 and MTA1) of nuclear receptors and summarize their links with the WNT/β-catenin signaling cascade, their expression in CRC and their role in intestinal physiopathology...
July 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28659036/cinnamomum-cassia-prevents-high-fat-diet-induced-obesity-in-mice-through-the-increase-of-muscle-energy
#7
Mi Young Song, Seok Yong Kang, Anna Kang, Ji Hye Hwang, Yong-Ki Park, Hyo Won Jung
The cortex of Cinnamomum cassia Presl (Cinnamomi Cortex: CC) has commonly been used for weight control in traditional medicines, but without a scientific basis. Therefore, this study was undertaken to investigate the anti-obesity effect of CC extract in a high-fat diet (HFD)-induced obese mouse model and in C2C12 mouse skeletal muscle cells. Male C57BL/6 mice were fed a normal diet or a HFD for 16 consecutive weeks, and orally administered CC extract (100 or 300[Formula: see text]mg/kg) or metformin (250[Formula: see text]mg/kg; positive control) daily for 16 weeks...
2017: American Journal of Chinese Medicine
https://www.readbyqxmd.com/read/28655613/int131-increases-dendritic-arborization-and-protects-against-a%C3%AE-toxicity-by-inducing-mitochondrial-changes-in-hippocampal-neurons
#8
Juan A Godoy, Juan M Zolezzi, Nibaldo C Inestrosa
In previous studies, we have demonstrated the beneficial effects of classic PPARγ agonists on neuroprotection against Aβ oligomer neurotoxicity in a double transgenic mouse model of Alzheimer' disease (AD). INT-131, a novel, non-thiazolidinedione compound that belongs to a new family of drugs, selective PPARγ modulators (SPPARMs), has provided an emerging opportunity for the treatment of type 2 diabetes mellitus and metabolic syndrome. However, its role in the central nervous system has not been studied...
August 26, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28647477/derivatives-of-alkyl-gallate-triphenylphosphonium-exhibit-antitumor-activity-in-a-syngeneic-murine-model-of-mammary-adenocarcinoma
#9
Liliana Peredo-Silva, Sebastián Fuentes-Retamal, Cristian Sandoval-Acuña, Mario Pavani, Juan D Maya, Vicente Castro-Castillo, Matías Madrid-Rojas, Solange Rebolledo, Ulrike Kemmerling, Eduardo Parra, Jorge Ferreira
We previously demonstrated that alkyl gallates coupled to triphenylphosphine have a selective and efficient antiproliferative effect by inducing mitochondrial uncoupling in vitro due to the increased mitochondrial transmembrane potential of tumor cells. Therefore, in this work, the in vivo antitumor activities of alkyl gallate triphenylphosphonium derivatives (TPP(+)C8, TPP(+)C10 and TPP(+)C12) were evaluated in a syngeneic murine model of breast cancer. We found that TPP(+)C10 increased the cytosolic ADP/ATP ratio and significantly increased the AMP levels in a concentration-dependent manner in TA3/Ha murine mammary adenocarcinoma cells...
August 15, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28587104/c1q-tnf-related-protein-9-ameliorates-ox-ldl-induced-endothelial-dysfunction-via-pgc-1%C3%AE-ampk-mediated-antioxidant-enzyme-induction
#10
Haijian Sun, Xuexue Zhu, Yuetao Zhou, Weiwei Cai, Liying Qiu
Oxidized low-density lipoprotein (ox-LDL) accumulation is one of the critical determinants in endothelial dysfunction in many cardiovascular diseases such as atherosclerosis. C1q/TNF-related protein 9 (CTRP9) is identified to be an adipocytokine with cardioprotective properties. However, the potential roles of CTRP9 in endothelial function remain largely elusive. In the present study, the effects of CTRP9 on the proliferation, apoptosis, migration, angiogenesis, nitric oxide (NO) production and oxidative stress in human umbilical vein endothelial cells (HUVECs) exposed to ox-LDL were investigated...
May 26, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28580300/resveratrol-attenuates-triglyceride-accumulation-associated-with-upregulation-of-sirt1-and-lipoprotein-lipase-in-3t3-l1-adipocytes
#11
Haruki Imamura, Daiji Nagayama, Noriko Ishihara, Syo Tanaka, Rena Watanabe, Yasuhiro Watanabe, Yuta Sato, Takashi Yamaguchi, Noriko Ban, Hidetoshi Kawana, Masahiro Ohira, Kei Endo, Atsuhito Saiki, Kohji Shirai, Ichiro Tatsuno
AIM: We aimed to investigate the effect of resveratrol (Rsv) on expression of genes regulating triglyceride (TG) accumulation and consumption in differentiated 3T3-L1 preadipocytes. METHODS: 3T3-L1 preadipocytes were cultured in DMEM supplemented with 10% fetal calf serum. Upon reaching confluence, cells were induced to differentiate for 4 days, cultured for 10 days for TG accumulation, and then incubated with Rsv (0, 25 or 50 μM) for 3 days. TG accumulation was analyzed by Oil Red-O staining...
September 2017: Molecular Genetics and Metabolism Reports
https://www.readbyqxmd.com/read/28556920/ampk-activator-acadesine-fails-to-alleviate-isoniazid-caused-mitochondrial-instability-in-hepg2-cells
#12
Tian-Guang Zhang, Takashi Ikejima, Toshihiko Hayashi, Jun Zhao, Yi-Mei Wang, Shuang-Qing Peng
Isoniazid (INH) is a first-line antituberculosis drug that is adversely associated with hepatotoxicity. Recently, impairment of mitochondrial homeostasis involved in this side effect has been noticed. Mitochondrial homeostasis is achieved by the balance between the generation of functional mitochondria by biogenesis and elimination of dysfunctional mitochondria by autophagy. AMP-activated protein kinase (AMPK) can maintain mitochondrial stability through positive control of these two processes. In this study, we showed that AMPK activator acadesine (AICAR) alleviated INH-caused impairment of mitochondrial biogenesis by activation of silent information regulator two ortholog 1 (SIRT1)-peroxisome proliferator-activated receptor γ coactivator 1α (PGC1 α) pathway in HepG2 cells...
May 29, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28546467/post-exercise-cold-water-immersion-modulates-skeletal-muscle-pgc-1%C3%AE-mrna-expression-in-immersed-and-non-immersed-limbs-evidence-of-systemic-regulation
#13
Robert Allan, Adam Philip Sharples, Graeme L Close, Barry Drust, Sam O Shepherd, John Dutton, James P Morton, Warren Gregson
Mechanisms mediating post-exercise cold-induced increases in PGC-1α gene expression in human skeletal muscle are yet to be fully elucidated, but may involve local cooling effects on AMPK and p38 MAPK related signalling and/or increased systemic β-adrenergic stimulation. We aimed to therefore examine whether post-exercise cold-water immersion enhancement of PGC-1α mRNA is mediated through local or systemic mechanisms. Ten subjects completed acute cycling (8x5 min at ~80% peak power output) followed by seated-rest (CON) or single-leg cold-water immersion (CWI; 10 min, 8°C)...
May 25, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28532831/cryosurvival-of-in%C3%A2-vitro-produced-bovine-embryos-supplemented-with-l-carnitine-and-concurrent-reduction-of-fatty-acids
#14
E Held-Hoelker, S L Klein, F Rings, D Salilew-Wondim, M Saeed-Zidane, C Neuhoff, D Tesfaye, K Schellander, M Hoelker
Lipid accumulation is associated with reduced embryonic quality, causing limited survival after cryopreservation. Therefore, in the present study we aimed to reveal the effects of supplementation of a lipid reducing agent, l-carnitine and the removal of fatty acids during in vitro culture on the morphological as well as on the molecular level. To accomplish that, presumptive zygotes were cultured in 4 contrasting groups: namely SOFaa medium supplemented with BSA, (BSA), SOFaa medium supplemented with fatty acid free BSA (FAF), SOFaa medium supplemented with BSA as well as l-Carnitine (BSA + LC) and SOFaa medium concurrently supplemented with fatty acid free BSA and l-Carnitine (FAF + LC)...
July 1, 2017: Theriogenology
https://www.readbyqxmd.com/read/28502800/microrna-211-regulates-oxidative-phosphorylation-and-energy-metabolism-in-human-vitiligo
#15
Anupama Sahoo, Bongyong Lee, Katia Boniface, Julien Seneschal, Sanjaya K Sahoo, Tatsuya Seki, Chunyan Wang, Soumen Das, Xianlin Han, Michael Steppie, Sudipta Seal, Alain Taieb, Ranjan J Perera
Vitiligo is a common chronic skin disorder characterized by loss of epidermal melanocytes and progressive depigmentation. Vitiligo has complex immune, genetic, environmental, and biochemical causes, but the exact molecular mechanisms of vitiligo development and progression, particularly those related to metabolic control, are poorly understood. In this study we characterized the human vitiligo cell line PIG3V and the normal human melanocyte line HEM-l by RNA sequencing, targeted metabolomics, and shotgun lipidomics...
September 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28448086/effects-of-running-wheel-activity-and-dietary-hmb-and-%C3%AE-alanine-co-supplementation-on-muscle-quality-in-aged-male-rats
#16
D W Russ, C Acksel, K W McCorkle, N K Edens, S M Garvey
OBJECTIVE: Loss of skeletal muscle function is linked to increased risk for loss of health and independence in older adults. Dietary interventions that can enhance aging muscle function, alone or in combination with exercise, may offer an effective way to reduce these risks. The goal of this study was to evaluate the muscular effects of beta-hydroxy-beta-methylbutyrate (HMB) and beta-alanine (β-Ala) co-supplementation in aged Sprague-Dawley rats with voluntary access to running wheels (RW)...
2017: Journal of Nutrition, Health & Aging
https://www.readbyqxmd.com/read/28423551/metabolic-reprogramming-of-the-premalignant-colonic-mucosa-is-an-early-event-in-carcinogenesis
#17
Mart Dela Cruz, Sarah Ledbetter, Sanjib Chowdhury, Ashish K Tiwari, Navneet Momi, Ramesh K Wali, Charles Bliss, Christopher Huang, David Lichtenstein, Swati Bhattacharya, Anisha Varma-Wilson, Vadim Backman, Hemant K Roy
BACKGROUND: Colorectal cancer (CRC) is the second leading cause of cancer-related mortality in the United States. There is an increasing need for the identification of biomarkers of pre-malignant and early stage CRC to improve risk-stratification and screening recommendations. In this study, we investigated the possibility of metabolic and mitochondrial reprogramming early in the pre-malignant colorectal field. METHODS: Rectal biopsies were taken from 81 patients undergoing screening colonoscopy, and gene expression of metabolic and mitochondrial markers were assessed using real time quantitative PCR...
March 28, 2017: Oncotarget
https://www.readbyqxmd.com/read/28294567/growth-hormone-secretagogues-prevent-dysregulation-of-skeletal-muscle-calcium-homeostasis-in-a-rat-model-of-cisplatin-induced-cachexia
#18
Elena Conte, Giulia Maria Camerino, Antonietta Mele, Michela De Bellis, Sabata Pierno, Francesco Rana, Adriano Fonzino, Roberta Caloiero, Laura Rizzi, Elena Bresciani, Khoubaib Ben Haj Salah, Jean-Alain Fehrentz, Jean Martinez, Arcangela Giustino, Maria Addolorata Mariggiò, Mauro Coluccia, Domenico Tricarico, Marcello Diego Lograno, Annamaria De Luca, Antonio Torsello, Diana Conte, Antonella Liantonio
BACKGROUND: Cachexia is a wasting condition associated with cancer types and, at the same time, is a serious and dose-limiting side effect of cancer chemotherapy. Skeletal muscle loss is one of the main characteristics of cachexia that significantly contributes to the functional muscle impairment. Calcium-dependent signaling pathways are believed to play an important role in skeletal muscle decline observed in cachexia, but whether intracellular calcium homeostasis is affected in this situation remains uncertain...
March 10, 2017: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/28164673/nuclear-respiratory-factor-1-nrf-1-gene-expression-in-chronic-kidney-disease-patients-undergoing-hemodialysis-and-mitochondrial-oxidative-dysregulation
#19
Doaa Hashad, Iman Elgohry, Fatma Dwedar
BACKGROUND: Chronic kidney disease (CKD) is characterized by progressive irreversible deterioration of renal functions. Advanced stages of CKD are associated with oxidative stress due to the imbalance between oxidant production and antioxidant defense mechanisms. Survival of patients with end stage renal diseases is maintained on variable forms of renal replacement therapies (RRT) which include peritoneal dialysis, hemodialysis, and sometimes renal transplantation. In humans, Nuclear Respiratory Factor 1 (NRF-1) gene encodes for a transcription factor that, together with the transcriptional co-activator encoded by Peroxisome Proliferator activated Receptor Gamma coactivator 1 Alpha (PGC1-a) gene, stimulates the expression of a broad set of nuclear genes (as COX6C) which are involved in mitochondrial biogenesis and functions...
November 1, 2016: Clinical Laboratory
https://www.readbyqxmd.com/read/28116391/a-rich-medium-chain-triacylglycerol-diet-benefits-adiposity-but-has-adverse-effects-on-the-markers-of-hepatic-lipogenesis-and-beta-oxidation
#20
Carolina Maria de Oliveira Chamma, Thereza Cristina Lonzetti Bargut, Carlos Alberto Mandarim-de-Lacerda, Marcia Barbosa Aguila
We investigated the increasing amounts of medium-chain triacylglycerol (MCT) in the diet on hepatic lipid metabolism. Mature C57BL/6 male mice were randomly divided into five groups (n = 10/group). The animals received their diet for 12 weeks, as a control (C group, 10% of energy from lipids); high-fat lard (HF group, isoenergetic diet, 50% of energy from lipids with lard); a mixture of lard and MCT oil (with a gradual replacement of lard by MCT: HF-MCT25%, HF-MCT75%, and HF-MCT100% groups). At euthanasia, we collected blood and dissected the liver for analyses (glucose, insulin, HOMA-IR, QUICK index, and triacylglycerol, light microscopy, western blotting, and RT-qPCR)...
February 22, 2017: Food & Function
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