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https://www.readbyqxmd.com/read/28324488/flow-cytometer-monitoring-of-bnip3-and-bnip3l-nix-dependent-mitophagy
#1
Matilda Šprung, Ivan Dikic, Ivana Novak
Mitochondria are organelles with numerous vital roles in cellular metabolism. Impaired or damaged mitochondria are degraded in autophagolysosomes in a process known as mitophagy. Given the fundamental role of mitophagy in maintenance of cellular homeostasis, methods and techniques with which to study this process are constantly evolving and emerging. So far, mitophagy flux was mostly monitored using fluorescently labeled LC3 protein on autophagosomal membrane and any of the labeled outer mitochondrial membrane proteins...
March 22, 2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28324055/substrate-metabolism-and-insulin-sensitivity-during-fasting-in-obese-human-subjects-impact-of-gh-blockade
#2
Morten Høgild Pedersen, Mads Vandsted Svart, Janne Lebeck, Martin Bidlingmaier, Hans Stødkilde-Jørgensen, Steen Bønløkke Pedersen, Niels Møller, Niels Jessen, Jens O L Jørgensen
Context: Insulin resistance and metabolic inflexibility are features of obesity and are amplified by fasting. GH secretion increases during fasting and GH causes insulin resistance. Objective: To study the metabolic effects of GH blockade during fasting in obese subjects. Subjects and Methods: Nine obese males were studied thrice in a randomized design: 1) After an overnight fast (Control), 2) After 72 h fasting (Fasting) and 3) After 72 h fasting with GH blockade (pegvisomant) (Fasting + GHA)...
January 18, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28324004/bone-turnover-is-suppressed-in-insulin-resistance-independent-of-adiposity
#3
K T Tonks, C P White, J R Center, D Samocha-Bonet, J R Greenfield
Context: The contribution of insulin resistance vs. adiposity to bone mineral density (BMD), bone turnover and fractures in humans remains unclear. Objective: Evaluate BMD and bone turnover markers (BTM) in lean (n=18) and overweight/obese individuals with (n=17) and without type 2 diabetes (n=34, deemed insulin-sensitive [Obsensitive, n=15] or insulin-resistant [Obresistant, n=19] by HOMA-IR). Design: Observational study. Outcome measures: Insulin sensitivity assessed by hyperinsulinemic-euglycemic clamp; whole body BMD and fat mass (FM) by DXA; and BTM (osteocalcin [OC], procollagen type-1 propeptide [P1NP] and collagen type-1 cross-linked C-telopeptide [CTx]) fasting and during clamp hyperinsulinemia...
January 23, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28323974/phenotypic-spectrum-in-osteogenesis-imperfecta-due-to-mutations-in-tmem38b-unravelling-a-complex-cellular-defect
#4
Emma A Webb, Meena Balasubramanian, Nadja Fratzl-Zelman, Wayne A Cabral, Hannah Titheradge, Atif Alsaedi, Vrinda Saraff, Julie Vogt, Trevor Cole, Susan Stewart, Nicola J Crabtree, Brandi M Sargent, Sonja Gamsjaeger, Eleftherios P Paschalis, Paul Roschger, Klaus Klaushofer, Nick J Shaw, Joan C Marini, Wolfgang Högler
Context: Recessive mutations in TMEM38B cause type XIV osteogenesis imperfecta (OI) by dysregulating intracellular calcium flux. Objectives: Clinical and bone material phenotype description and osteoblast differentiation studies. Design and Setting: Natural history study in paediatric research centres. Patients: Eight patients with type XIV OI. Main Outcome Measures: Clinical examinations included: bone mineral density, radiographs, echocardiography and muscle biopsy...
March 16, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28323942/incretin-therapies-do-not-expand-%C3%AE-cell-mass-or-alter-pancreatic-histology-in-young-male-mice
#5
Aaron R Cox, Carol J Lam, Matthew M Rankin, Jacqueline S Rios, Julia Chavez, Claire W Bonnyman, Kourtney B King, Roger A Wells, Deepti Anthony, Justin X Tu, Jenny J Kim, Changhong Li, Jake A Kushner
The impact of incretins upon pancreatic β-cell expansion remains extremely controversial. Multiple studies indicate that incretin-based therapies can increase β-cell proliferation, and incretins have been hypothesized to expand β-cell mass. However, considerable disagreement exists on whether incretins actually increase β-cell mass. Moreover, some reports indicate that incretins may cause metaplastic changes in pancreatic histology. To resolve these questions we treated a large cohort of mice with incretin-based therapies and carried out a rigorous analysis of β-cell turnover and pancreatic histology using high-throughput imaging...
March 8, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323935/association-of-in-vivo-adipose-tissue-cellular-kinetics-with-markers-of-metabolic-health-in-humans
#6
Ursula A White, Mark D Fitch, Robbie A Beyl, Marc K Hellerstein, Eric Ravussin
Context: Adipose tissue expansion occurs by hypertrophy and hyperplasia. Impaired hyperplasia, or adipogenesis, has been associated with obesity-related diseases. The cellular mechanisms underlying in vivo adipose cell turnover are not elucidated. Objective: We previously reported differences in in vivo cellular kinetics between the subcutaneous abdominal (scABD) and femoral (scFEM) depots using an 8-week incorporation of deuterium in women with obesity. We have now examined how in vivo kinetics correlate with markers of metabolic health...
March 2, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28323930/%C3%AE-cells-persist-in-t1d-pancreata-without-evidence-for-ongoing-%C3%AE-cell-turnover-or-neogenesis
#7
Carol J Lam, Daniel R Jacobson, Matthew M Rankin, Aaron R Cox, Jake A Kushner
Context: The cellular basis of persistent β-cell function in T1D remains enigmatic. No extensive quantitative β-cell studies of T1D pancreata have been performed to test for ongoing β-cell regeneration or neogenesis. Objective: We sought to determine the mechanism of β-cell persistence in T1D pancreata. Design: We studied T1D (n=47) and non-diabetic control (n=59) pancreata over a wide range of ages from the JDRF Network of Pancreatic Organ donors with Diabetes (nPOD) via high throughput microscopy...
February 27, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28323872/expression-maturation-and-turnover-of-drrs-an-unusually-stable-dosr-regulated-small-rna-in-mycobacterium-tuberculosis
#8
Alexandra Moores, Ana B Riesco, Stefan Schwenk, Kristine B Arnvig
Mycobacterium tuberculosis depends on the ability to adjust to stresses encountered in a range of host environments, adjustments that require significant changes in gene expression. Small RNAs (sRNAs) play an important role as post-transcriptional regulators of prokaryotic gene expression, where they are associated with stress responses and, in the case of pathogens, adaptation to the host environment. In spite of this, the understanding of M. tuberculosis RNA biology remains limited. Here we have used a DosR-associated sRNA as an example to investigate multiple aspects of mycobacterial RNA biology that are likely to apply to other M...
2017: PloS One
https://www.readbyqxmd.com/read/28323592/measuring-uptake-and-elimination-of-nitrogen-in-humans-at-different-ambient-pressures
#9
Patrik Sundblad, Oskar Frånberg, Christoph Siebenmann, Mikael Gennser
BACKGROUND: To measure nitrogen (N2) wash-out and uptake requires elaborate set-ups, especially when doing the measurements at increased or decreased ambient pressure. Here we present a transportable device for quantifying N2 turnover in humans which can be used at different ambient pressures. METHODS: A modified close-circuit electronic rebreather was used to assess N2 turnover. Changes in N2 volume within the rebreathing circuit, reflecting N2 uptake or washout, were derived from the continuously monitored total system volume and the calculated volumes of oxygen and water vapor...
December 1, 2016: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28319824/effect-of-long-term-remote-ischaemic-conditioning-on-platelet-function-and-fibrinolysis-in-patients-with-chronic-ischaemic-heart-failure
#10
Kasper Pryds, Jacobina Kristiansen, Søs Neergaard-Petersen, Roni R Nielsen, Michael R Schmidt, Jens Refsgaard, Steen D Kristensen, Hans Erik Bøtker, Anne-Mette Hvas, Erik L Grove
INTRODUCTION: Remote ischaemic conditioning (RIC) protects against ischaemia-reperfusion injury through cellular protective pathways, but may also modulate haemostasis. We aimed to investigate the effect of long-term RIC on platelet function and fibrinolysis in patients with chronic ischaemic heart failure (CIHF). MATERIAL AND METHODS: In a prospective, outcome-assessor blinded, paired study, 16 patients with CIHF and 21 age- and gender-matched controls without ischaemic heart disease (IHD) were treated with RIC once daily for 28±4days...
March 10, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/28319749/antidepressant-activity-of-zinc-further-evidence-for-the-involvement-of-the-serotonergic-system
#11
Bernadeta Szewczyk, Katarzyna Kotarska, Agata Siwek, Łukasz Olech, Katarzyna Kuter
BACKGROUND: The present study sought to further evaluate the role of the serotonergic system especially the postsynaptic 5-HT1A receptors (5-HT1AR) in the mechanism of antidepressant action of zinc. METHODS: Messenger RNA (mRNA), protein level, and 5-HT1AR density as well as the rate of monoamine (dopamine, DA, and serotonin) metabolism in the prefrontal cortex (PFC) and hippocampus (Hp) of rats subjected to acute and chronic (21days) zinc (5mg Zn/kg) treatment were measured...
January 19, 2017: Pharmacological Reports: PR
https://www.readbyqxmd.com/read/28319217/improving-artificial-metalloenzymes-activity-by-optimizing-electron-transfer
#12
Cheng Hu, Yang Yu, Jiangyun Wang
While many artificial metalloenzymes have been reported, and are proposed to be highly promising for energy, environmental and medical applications, few could match the turnover rate (TOR) and turnover number (TON) of natural enzymes. Since electron transfer is oftentimes the rate-determining step, optimizing the electron transfer efficiency is an effective approach to significantly enhance artificial enzymes' activity. In this article, we review the recent progress in improving artificial metalloenzymes' activity by optimizing electron transfer...
March 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28319202/evolving-notch-polyq-tracts-reveal-possible-solenoid-interference-elements
#13
Albert J Erives
Polyglutamine (polyQ) tracts in regulatory proteins are extremely polymorphic. As functional elements under selection for length, triplet repeats are prone to DNA replication slippage and indel mutations. Many polyQ tracts are also embedded within intrinsically disordered domains, which are less constrained, fast evolving, and difficult to characterize. To identify structural principles underlying polyQ tracts in disordered regulatory domains, here I analyze deep evolution of metazoan Notch polyQ tracts, which can generate alleles causing developmental and neurogenic defects...
2017: PloS One
https://www.readbyqxmd.com/read/28318821/snf2-family-protein-fft3-suppresses-nucleosome-turnover-to-promote-epigenetic-inheritance-and-proper-replication
#14
Nitika Taneja, Martin Zofall, Vanivilasini Balachandran, Gobi Thillainadesan, Tomoyasu Sugiyama, David Wheeler, Ming Zhou, Shiv I S Grewal
Heterochromatin can be epigenetically inherited in cis, leading to stable gene silencing. However, the mechanisms underlying heterochromatin inheritance remain unclear. Here, we identify Fft3, a fission yeast homolog of the mammalian SMARCAD1 SNF2 chromatin remodeler, as a factor uniquely required for heterochromatin inheritance, rather than for de novo assembly. Importantly, we find that Fft3 suppresses turnover of histones at heterochromatic loci to facilitate epigenetic transmission of heterochromatin in cycling cells...
March 8, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28318333/urinary-levels-of-pyridinoline-and-deoxypyridinoline-and-bone-mineral-density-in-children-with-type-1-diabetes-mellitus
#15
Nadide Melike Sav, Mustafa Kendirci, Leyla Akin, Selim Kurtoglu
OBJECTIVE: There is still controversy over the impact of diabetes mellitus (DM) on bone mass in children. Pyridinoline (Pyr) and deoxypyridinoline (DPyr), which stabilize the collagen chains within the extracellular matrix, are known as specific bone turnover markers. The aim of this study was to investigate the relationship between urinary Pyr and DPyr excretions and bone mineral density (BMD) in children with type 1 DM. METHODS: Serum levels of Ca, phosphorus (P), magnesium (Mg), and parathormone (PTH), alkaline phosphatase (ALP) activity, and urinary excretions of Pyr and DPyr were evaluated in 50 diabetic and 130 healthy control subjects aged between 7 and 15 years...
March 20, 2017: Endocrine Research
https://www.readbyqxmd.com/read/28318330/changes-of-bone-mineral-density-and-serum-pentosidine-during-a-27-month-follow-up-of-monthly-minodronate-in-osteoporotic-patients
#16
Tsuyoshi Ohishi, Tomotada Fujita, Daisuke Suzuki, Tatsuya Nishida, Kazufumi Yamamoto, Ryo Okabayashi, Hiroki Ushirozako, Tomohiro Banno, Yukihiro Matsuyama
PURPOSE: Monthly regimen of minodronate for osteoporosis more than two years has not been reported yet. The aim of this study is to elucidate the effect of monthly minodronate (M-MIN) on bone mineral density (BMD) and serum pentosidine (Pen) during 27 months. MATERIALS AND METHODS: The study consisted of 52 newly treated patients (73.3 ± 8.8 years) (new group) and 47 patients (75.9 ± 9.5 years) who were switched from either alendronate or risedronate (switch group)...
March 20, 2017: Endocrine Research
https://www.readbyqxmd.com/read/28318324/subchondral-bone-response-to-injected-adipose-derived-stromal-cells-for-treating-osteoarthritis-using-an-experimental-rabbit-model
#17
A Parrilli, G Giavaresi, A Ferrari, F Salamanna, G Desando, B Grigolo, L Martini, M Fini
Although articular cartilage is the target of osteoarthritis (OA), its deterioration is not always clearly associated with patient symptoms. Because a functional interaction between cartilage and bone is crucial, the pathophysiology of OA and its treatment strategy must focus also on subchondral bone. We investigated whether adipose-derived stromal cells (ASCs) injected into a joint at two different concentrations could prevent subchondral bone damage after the onset of mild OA in a rabbit model. We measured both volumetric and densitometric aspects of bone remodeling...
March 20, 2017: Biotechnic & Histochemistry: Official Publication of the Biological Stain Commission
https://www.readbyqxmd.com/read/28318115/microbial-players-and-processes-involved-in-phytoplankton-bloom-utilization-in-the-water-column-of-a-fast-flowing-river-dominated-estuary
#18
Maria W Smith, Lydie Herfort, Caroline S Fortunato, Byron C Crump, Holly M Simon
Fueled by seasonal phytoplankton blooms, the Columbia River estuary is a natural bioreactor for organic matter transformations. Prior metagenome analyses indicated high abundances of diverse Bacteroidetes taxa in estuarine samples containing phytoplankton. To examine the hypothesis that Bacteroidetes taxa have important roles in phytoplankton turnover, we further analyzed metagenomes from water collected along a salinity gradient at 0, 5, 15, 25, and 33 PSU during bloom events. Size fractions were obtained by using a 3-μm prefilter and 0...
March 20, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28317257/top-down-control-of-carbon-sequestration-grazing-affects-microbial-structure-and-function-in-salt-marsh-soils
#19
Peter Mueller, Dirk Granse, Stefanie Nolte, Hai Thi Do, Magdalena Weingartner, Stefan Hoth, Kai Jensen
Tidal wetlands have been increasingly recognized as long-term carbon sinks in recent years. Work on carbon sequestration and decomposition processes in tidal wetlands focused so far mainly on effects of global-change factors such as sea-level rise and increasing temperatures. However, little is known about effects of land use, such as livestock grazing, on organic matter decomposition and ultimately carbon sequestration. The present work aims at understanding the mechanisms by which large herbivores can affect organic matter decomposition in tidal wetlands...
March 20, 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28317111/an-experimental-test-of-the-habitat-amount-hypothesis-for-saproxylic-beetles-in-a-forested-region
#20
Sebastian Seibold, Claus Bässler, Roland Brandl, Lenore Fahrig, Bernhard Förster, Marco Heurich, Torsten Hothorn, Fabian Scheipl, Simon Thorn, Jörg Müller
The habitat-amount hypothesis challenges traditional concepts that explain species richness within habitats, such as the habitat-patch hypothesis, where species number is a function of patch size and patch isolation. It posits that effects of patch size and patch isolation are driven by effects of sample area, and thus that the number of species at a site is basically a function of the total habitat amount surrounding this site. We tested the habitat-amount hypothesis for saproxylic beetles and their habitat of dead wood by using an experiment comprising 190 plots with manipulated patch sizes situated in a forested region with a high variation in habitat amount (i...
March 19, 2017: Ecology
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