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https://www.readbyqxmd.com/read/29034085/amp-activated-protein-kinase-not-just-an-energy-sensor
#1
REVIEW
David Grahame Hardie, Sheng-Cai Lin
Orthologues of AMP-activated protein kinase (AMPK) occur in essentially all eukaryotes as heterotrimeric complexes comprising catalytic α subunits and regulatory β and γ subunits. The canonical role of AMPK is as an energy sensor, monitoring levels of the nucleotides AMP, ADP, and ATP that bind competitively to the γ subunit. Once activated, AMPK acts to restore energy homeostasis by switching on alternate ATP-generating catabolic pathways while switching off ATP-consuming anabolic pathways. However, its ancestral role in unicellular eukaryotes may have been in sensing of glucose rather than energy...
2017: F1000Research
https://www.readbyqxmd.com/read/29033323/mtorc1-phosphorylates-acetyltransferase-p300-to-regulate-autophagy-and-lipogenesis
#2
Wei Wan, Zhiyuan You, Yinfeng Xu, Li Zhou, Zhunlv Guan, Chao Peng, Catherine C L Wong, Hua Su, Tianhua Zhou, Hongguang Xia, Wei Liu
Acetylation is increasingly recognized as one of the major post-translational mechanisms for the regulation of multiple cellular functions in mammalian cells. Acetyltransferase p300, which acetylates histone and non-histone proteins, has been intensively studied in its role in cell growth and metabolism. However, the mechanism underlying the activation of p300 in cells remains largely unknown. Here, we identify the homeostatic sensor mTORC1 as a direct activator of p300. Activated mTORC1 interacts with p300 and phosphorylates p300 at 4 serine residues in the C-terminal domain...
October 11, 2017: Molecular Cell
https://www.readbyqxmd.com/read/29032506/differential-effects-of-amp-activated-protein-kinase-in-isolated-rat-atria-subjected-to-simulated-ischemia-reperfusion-depending-on-the-energetic-substrates-available
#3
Romina Hermann, Victoria Evangelina Mestre Cordero, María de Las Mercedes Fernández Pazos, Federico Joaquín Reznik, Débora Elisabet Vélez, Enrique Alberto Savino, María Gabriela Marina Prendes, Alicia Varela
AMP-activated protein kinase (AMPK) is a serine-threonine kinase that functions primarily as a metabolic sensor to coordinate anabolic and catabolic processes in the cell, via phosphorylation of multiple proteins involved in metabolic pathways, aimed to re-establish energy homeostasis at a cell-autonomous level. Myocardial ischemia and reperfusion represents a metabolic stress situation for myocytes. Whether AMPK plays a critical role in the metabolic and functional responses involved in these conditions remains uncertain...
October 14, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/29031484/effects-of-leucine-enriched-essential-amino-acid-and-whey-protein-bolus-dosing-upon-skeletal-muscle-protein-synthesis-at-rest-and-after-exercise-in-older-women
#4
Daniel J Wilkinson, Syed S I Bukhari, Bethan E Phillips, Marie C Limb, Jessica Cegielski, Matthew S Brook, Debbie Rankin, William K Mitchell, Hisamine Kobayashi, John P Williams, Jonathan Lund, Paul L Greenhaff, Kenneth Smith, Philip J Atherton
BACKGROUND & AIMS: Impaired anabolic responses to nutrition and exercise contribute to loss of skeletal muscle mass with ageing (sarcopenia). Here, we tested responses of muscle protein synthesis (MPS), in the under represented group of older women, to leucine-enriched essential amino acids (EAA) in comparison to a large bolus of whey protein (WP). METHODS: Twenty-four older women (65 ± 1 y) received (N = 8/group) 1.5 g leucine-enriched EAA supplements (LEAA_1...
September 23, 2017: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/29030394/ptdins3p-controls-mtorc1-signaling-through-lysosomal-positioning
#5
Zhi Hong, Nina Marie Pedersen, Ling Wang, Maria Lyngaas Torgersen, Harald Stenmark, Camilla Raiborg
The mechanistic target of rapamycin complex 1 (mTORC1) is a protein kinase complex that localizes to lysosomes to up-regulate anabolic processes and down-regulate autophagy. Although mTORC1 is known to be activated by lysosome positioning and by amino acid-stimulated production of phosphatidylinositol 3-phosphate (PtdIns3P) by the lipid kinase VPS34/PIK3C3, the mechanisms have been elusive. Here we present results that connect these seemingly unrelated pathways for mTORC1 activation. Amino acids stimulate recruitment of the PtdIns3P-binding protein FYCO1 to lysosomes and promote contacts between FYCO1 lysosomes and endoplasmic reticulum that contain the PtdIns3P effector Protrudin...
October 13, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/29028650/fast-digestive-proteins-and-sarcopenia-of-aging
#6
Yves Boirie, Christelle Guillet
PURPOSE OF REVIEW: The speed of dietary protein digestion influences postprandial amino acid availability which is crucial for improving altered anabolic response of skeletal muscle one feature of sarcopenia during aging. RECENT FINDINGS: By analogy with carbohydrate and in reference to their absorption rate, dietary proteins can be classified as 'fast' or 'slow' proteins depending on matrix food structure and technological processes, which can influence amino acids availability and their subsequent metabolic actions...
October 11, 2017: Current Opinion in Clinical Nutrition and Metabolic Care
https://www.readbyqxmd.com/read/29025897/a-drosophila-model-of-insulin-resistance-associated-with-the-human-trib3-q-r-polymorphism
#7
Zachary Fischer, Rahul Das, Anna Shipman, Jin-Yuan Fan, Laramie Pence, Samuel Bouyain, Leonard L Dobens
Members of the Tribbles family of proteins are conserved pseudokinases with diverse roles in cell growth and proliferation. Both Drosophila Tribbles (Trbl) and vertebrate Trib3 proteins bind to Akt kinase to block its phosphorylation-activation and reduce downstream insulin-stimulated anabolism. A single nucleotide polymorphism (SNP) variant in human Trib3, which results in a glutamine (Q) to arginine (R) missense mutation in a conserved motif at position 84, confers stronger Akt binding resulting in reduced Akt phosphorylation and is associated with a predisposition to Type II diabetes, cardiovascular disease, diabetic nephropathy, chronic kidney disease and leukemogenesis...
October 12, 2017: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/29024598/effects-of-long-term-exposures-to-low-iron-and-branched-chain-amino-acid-containing-diets-on-aging-skeletal-muscle-of-fisher-344-brown-norway-rats
#8
Yuho Kim, Sok Sambo Men, Chen Liang, Candace N Receno, Tom D Brutsaert, Donna L Korol, Kevin S Heffernan, Keith C DeRuisseau
Aging skeletal muscle displays an altered iron status that may promote oxidative stress and sarcopenia. A low iron (LI) containing diet could reduce muscle iron status and attenuate age-related muscle atrophy. Supplemental branched-chain amino acids (BCAA) may also alleviate sarcopenia by promoting muscle protein synthesis and iron status improvement. This study examined individual and combined effects of LI and BCAA diets on anabolic signaling and iron status in skeletal muscle of aging rats. Twenty-nine-month-old male F344BN rats consumed the following control-base diets: Control + regular iron (35 mg iron/kg) (CR; n = 11); Control + LI (~6 mg iron/kg) (CL; n = 11); 2×BCAA + regular iron (BR; n = 10); and 2×BCAA + LI (BL; n = 12) for 12 weeks...
October 12, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29024120/remodeling-and-modeling-based-bone-formation-with-teriparatide-versus-denosumab-a-longitudinal-analysis-from-baseline-to-3-months-in-the-ava-study
#9
David W Dempster, Hua Zhou, Robert R Recker, Jacques P Brown, Christopher P Recknor, E Michael Lewiecki, Paul D Miller, Sudhaker D Rao, David L Kendler, Robert Lindsay, John H Krege, Jahangir Alam, Kathleen A Taylor, Thomas E Melby, Valerie A Ruff
There has been renewed interest of late in the role of modeling-based formation (MBF) during osteoporosis therapy. Here we describe early effects of an established anabolic (teriparatide) versus antiresorptive (denosumab) agent on remodeling-based formation (RBF), MBF, and overflow MBF (oMBF) in human transiliac bone biopsies. Postmenopausal women with osteoporosis received subcutaneous teriparatide (n = 33, 20 µg/day) or denosumab (n = 36, 60 mg once/6 months), open-label for 6 months at 7 US and Canadian sites...
October 12, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/29022571/epidemiology-of-cardiovascular-disease-in-young-individuals
#10
REVIEW
Charlotte Andersson, Ramachandran S Vasan
In the past 2 decades, a high prevalence of risk factors for cardiovascular disease, such as obesity, physical inactivity, and poor diet, has been observed among young individuals living in developed countries. The rate of substance abuse (opioids, cocaine, electronic cigarettes, and anabolic steroids) is also increasing among young adults, whereas cigarette smoking might be declining. Among younger individuals (aged 18-50 years), the incidence of cardiovascular diseases over the same time period has either been steady or has increased, in contrast to the trend towards a lower incidence of cardiovascular disease in adults aged >50 years...
October 12, 2017: Nature Reviews. Cardiology
https://www.readbyqxmd.com/read/29020880/pulsed-electromagnetic-fields-and-tissue-engineering-of-the-joints
#11
Kenjiro Iwasa, Reddi A Hari
BACKGROUND: Bone and cartilage joint formation, maintenance and regeneration are regulated by both chemical and physical signals. Among the physical signals there is increasing realization of the role of Pulsed electromagnetic fields (PEMF) in the treatment of nonunions of bone fractures. The discovery of the piezoelectric properties of bone by Fukada and Yasuda in 1953 in Japan established the foundation of this field. Pioneering research by Bassett and Brighton and their teams resulted in the approval by Food and Drug Administration (FDA) the use of PEMF in treatment of fracture healing...
October 12, 2017: Tissue Engineering. Part B, Reviews
https://www.readbyqxmd.com/read/29020729/diagnosing-and-managing-androgen-deficiency-in-men
#12
Raveen Kaur Sandher, Jonathan Aning
Androgens play a crucial role in bone, muscle and fat metabolism, erythropoiesis and cognitive health. In men aged 40-79 years the incidence of biochemical deficiency and symptomatic hypogonadism is 2.1-5.7%. Decreased libido or reduced frequency and quality of erections, fatigue, irritability, infertility or a diminished feeling of wellbeing may be presenting complaints. However, a significant proportion of men with androgen deficiency will be identified when they present for unrelated concerns. Important factors to elicit from the history in addition to the presenting complaint include: a medical history of obesity, type 2 diabetes, systemic diseases or metabolic syndrome which all impact on testosterone physiology...
April 2017: Practitioner
https://www.readbyqxmd.com/read/29020342/lack-of-ovarian-secretions-reverts-the-anabolic-action-of-olanzapine-in-female-rats
#13
Silje Skrede, Ismael González-García, Luís Martins, Rolf Kristian Berge, Ruben Nogueiras, Manuel Tena-Sempere, Gunnar Mellgren, Vidar Martin Steen, Miguel López, Johan Fernø
Background: Olanzapine (OLZ) is an orexigenic antipsychotic drug associated with serious metabolic adverse effects in humans. Development of valid rodent models for antipsychotic-induced metabolic adverse effects is hampered by the fact that such effects occur in females only. Estradiol (E2) is a predominant female hormone that regulates energy balance. We hypothesized that the female-specific hyperphagia and weight gain induced by OLZ in the rat are dependent on the presence of estrogens...
August 14, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29019883/bone-mineral-density-changes-of-lumbar-spine-and-femur-in-osteoporotic-patient-treated-with-bisphosphonates-and-beta-hydroxy-beta-methylbutyrate-hmb-case-report
#14
Marcin R Tatara, Witold Krupski, Barbara Majer-Dziedzic
RATIONALE: Currently available approaches to osteoporosis treatment include application of antiresorptive and anabolic agents influencing bone tissue metabolism. The aim of the study was to present bone mineral density (BMD) changes of lumbar spine in osteoporotic patient treated with bisphosphonates such as ibandronic acid and pamidronic acid, and beta-hydroxy-beta-methylbutyrate (HMB). PATIENT CONCERNS: BMD and volumetric BMD (vBMD) of lumbar spine were measured during the 6 year observation period with the use of dual-energy X-ray absorptiometry (DEXA) and quantitative computed tomography (QCT)...
October 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29019018/long-term-anabolic-steroids-in-male-bodybuilders-induce-cardiovascular-structural-and-autonomic-abnormalities
#15
Octávio Barbosa Neto, Gustavo Ribeiro da Mota, Carla Cristina De Sordi, Elisabete Aparecida M R Resende, Luiz Antônio P R Resende, Marco Antônio Vieira da Silva, Moacir Marocolo, Rafael Silva Côrtes, Lucas Felipe de Oliveira, Valdo José Dias da Silva
OBJECTIVE: The aims of this study were to examine the hypothesis that users of anabolic androgenic steroids (AAS) would have cardiac autonomic disorders and that there is a correlation between sympathetic modulation, high blood pressure (BP) and alterations to cardiac dimensions. METHODS: Forty-five male subjects were enrolled in the study. They were categorized into three groups comprising bodybuilders actively using AAS (AAS users; n = 15), bodybuilders who had never used AAS (nonusers; n = 15) and age-paired healthy sedentary controls (n = 15)...
October 10, 2017: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
https://www.readbyqxmd.com/read/29017627/mycoprotein-represents-a-bioavailable-and-insulinotropic-non-animal-derived-dietary-protein-source-a-dose-response-study
#16
Mandy V Dunlop, Sean P Kilroe, Joanna L Bowtell, Tim J A Finnigan, Deborah L Salmon, Benjamin T Wall
The anabolic potential of a dietary protein is determined by its ability to elicit postprandial rises in circulating essential amino acids and insulin. Minimal data exist regarding the bioavailability and insulinotropic effects of non-animal-derived protein sources. Mycoprotein is a sustainable and rich source of non-animal-derived dietary protein. We investigated the impact of mycoprotein ingestion, in a dose-response manner, on acute postprandial hyperaminoacidaemia and hyperinsulinaemia. In all, twelve healthy young men completed five experimental trials in a randomised, single-blind, cross-over design...
October 11, 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/29016371/inflammation-in-bone-physiology-and-pathology
#17
Iannis E Adamopoulos
PURPOSE OF REVIEW: Bone is constantly being remodeled throughout adult life through constant anabolic and catabolic actions that maintain tissue homeostasis. A number of hormones, cytokines growth factors, and the proximity of various cells to bone surfaces influence this process. Inflammatory changes at the bone microenvironment result in alterations leading to both excessive bone loss and bone formation. Detailed understanding of the physiological and pathological mechanisms that dictate these changes will allow us to harness inflammatory signals in bone regeneration...
October 7, 2017: Current Opinion in Rheumatology
https://www.readbyqxmd.com/read/29016348/parp-1-and-parp-2-activity-in-cancer-induced-cachexia-potential-therapeutic-implications
#18
Esther Barreiro, Joaquim Gea
Skeletal muscle dysfunction and mass loss is a characteristic feature in patients with chronic diseases including cancer and acute conditions such as critical illness. Maintenance of an adequate muscle mass is crucial for the patients' prognosis irrespective of the underlying condition. Moreover, aging-related sarcopenia may further aggravate the muscle wasting process associated with chronic diseases and cancer. Poly(adenosine diphosphate-ribose) polymerase (PARP) activation has been demonstrated to contribute to the pathophysiology of muscle mass loss and dysfunction in animal models of cancer-induced cachexia...
October 26, 2017: Biological Chemistry
https://www.readbyqxmd.com/read/28988574/alcoholic-myopathy-pathophysiologic-mechanisms-and-clinical-implications
#19
Liz Simon, Sarah E Jolley, Patricia E Molina
Skeletal muscle dysfunction (i.e., myopathy) is common in patients with alcohol use disorder. However, few clinical studies have elucidated the significance, mechanisms, and therapeutic options of alcohol-related myopathy. Preclinical studies indicate that alcohol adversely affects both anabolic and catabolic pathways of muscle-mass maintenance and that an increased proinflammatory and oxidative milieu in the skeletal muscle is the primary contributing factor leading to alcohol-related skeletal muscle dysfunction...
2017: Alcohol Research: Current Reviews
https://www.readbyqxmd.com/read/28988314/the-prostate-response-to-prolactin-modulation-in-adult-castrated-rats-subjected-to-testosterone-replacement
#20
Flávia B Constantino, Ana C L Camargo, Sérgio A A Santos, Ketlin T Colombelli, Laura F Martin, Marcia G Silva, Sérgio L Felisbino, Luis A Justulin
Despite the androgenic dependence, other hormones, growth factors, and cytokines are necessary to support prostatic growth and maintain the glandular structure; among them, prolactin is a non-steroidal hormone secreted mainly by the pituitary gland. However, extra-pituitary expression of prolactin, such as in the prostate, has also been demonstrated, highlighting the paracrine and autocrine actions of prolactin within the prostate. Here, we investigated whether prolactin modulation alters ventral prostate (VP) morphophysiology in adult castrated rats...
October 7, 2017: Journal of Molecular Histology
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