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https://www.readbyqxmd.com/read/29351584/the-roles-of-left-versus-right-anterior-temporal-lobes-in-semantic-memory-a-neuropsychological-comparison-of-postsurgical-temporal-lobe-epilepsy-patients
#1
Grace E Rice, Helen Caswell, Perry Moore, Paul Hoffman, Matthew A Lambon Ralph
The presence and degree of specialization between the anterior temporal lobes (ATLs) is a key issue in debates about the neural architecture of semantic memory. Here, we comprehensively assessed multiple aspects of semantic cognition in a large group of postsurgical temporal lobe epilepsy (TLE) patients with left versus right anterior temporal lobectomy (n = 40). Both subgroups showed deficits in expressive and receptive verbal semantic tasks, word and object recognition, naming and recognition of famous faces and perception of faces and emotions...
January 17, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29351485/insulin-signaling-displayed-a-differential-tissue-specific-response-to-low-dose-dht-in-female-mice
#2
Stanley Andrisse, Katelyn Billings, Ping Xue, Sheng Wu
Hyperandrogenemia and hyperinsulinemia are believed to play prominent roles in polycystic ovarian syndrome (PCOS). We explored the effects of low dose dihydrotestosterone (DHT), a PCOS model, on insulin signaling in metabolic and re-productive tissues in a female mouse model. Insulin resistance in the energy storage tissues is associated with type 2 diabetes. Insulin signaling in the ovaries and pituitary either directly or indirectly stimulates androgen production. Energy storage and reproductive tissues were isolated and molecular assays were performed...
December 19, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29351479/using-2h-water-to-quantify-the-contribution-of-de-novo-palmitate-synthesis-in-plasma-enabling-back-to-back-studies
#3
Stephen F Previs, Kithsiri Herath, Andrea R Nawrocki, Carlos G Rodriguez, Deborah Slipetz, Sheo B Singh, Ling Kang, Gowri Bhat, Thomas P Roddy, Stacey Conarello, Jenna Terebetski, Mark D Erion, David E Kelley
An increased contribution of de novo lipogenesis (DNL) may play a role in cases of dyslipidemia and adipose accretion, this suggests that inhibition of fatty acid synthesis may affect clinical phenotypes. Since it is not clear whether modulation of one step in the lipogenic pathway is more important than another, the use of tracer methods can provide a deeper level of insight regarding the control of metabolic activity. Although [2H]water is generally considered a reliable tracer for quantifying DNL in vivo (it yields a homogenous and quantifiable precursor labeling), the relatively long half-life of body water is thought to limit the ability of performing repeat studies in the same subjects; this can create a bottleneck in the development and evaluation of novel therapeutics for inhibiting DNL...
January 2, 2018: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29351477/mathematical-analysis-of-circadian-disruption-and-metabolic-re-entrainment-of-hepatic-gluconeogenesis-the-intertwining-entraining-roles-of-light-and-feeding
#4
Seul-A Bae, Ioannis P Androulakis
The circadian rhythms influence the metabolic activity from molecular level to tissue, organ, and host level. Disruption of the circadian rhythms manifest to the host's health as metabolic syndromes including obesity, diabetes, and elevated plasma glucose, eventually leading to cardiovascular diseases. Therefore, it is imperative to understand the mechanism behind the relationship between circadian rhythms and metabolism. To start answering this question, we propose a semi-mechanistic mathematical model to study the effect of circadian disruption on hepatic gluconeogenesis in humans...
January 9, 2018: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29351470/increased-pro-renin-receptor-expression-in-subfornical-organ-neurons-in-hypertensive-humans
#5
Silvana G Cooper, Darshan P Trivedi, Rieko Yamamoto, Caleb J Worker, Cheng-Yuan Feng, Jacob T Sorensen, Wei Yang, Zhenggang Xiong, Yumei Feng
The central nervous system plays an important role in essential hypertension in humans and in animal models of hypertension through modulation of sympathetic activity, and sodium and body fluid homeostasis. Data from animal models of hypertension suggest that the renin-angiotensin system in the subfornical organ (SFO) of the brain is critical for hypertension development. We recently reported that the brain (pro)renin receptor (PRR) is a novel component of the brain renin-angiotensin system and could be a key initiator of the pathogenesis of hypertension...
December 22, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351457/important-role-of-endothelium-dependent-hyperpolarization-in-pulmonary-microcirculation-in-male-mice-implications-for-hypoxia-induced-pulmonary-hypertension
#6
Shuhei Tanaka, Takashi Shiroto, Shigeo Godo, Hiroki Saito, Yosuke Ikumi, Akiyo Ito, Shoko Kajitani, Saori Sato, Hiroaki Shimokawa
Endothelium-dependent hyperpolarization (EDH) plays important roles in systemic circulation, whereas its role in pulmonary circulation remains largely unknown. Furthermore, the underlying mechanisms of pulmonary hypertension (PH) also remain to be elucidated. We thus aimed to elucidate the role of EDH in pulmonary circulation in general and in PH in particular. In isolated perfused lung using male wild-type mice, endothelium-dependent relaxations to bradykinin (BK) were significantly reduced in the presence of Nω-nitro-L-arginine (L-NNA) by ~50% as compared with those in the presence of indomethacin, and the combination of apamin plus charybdotoxin abolished the residual relaxations, showing the comparable contributions of nitric oxide (NO) and EDH in pulmonary microcirculation under physiological conditions...
January 5, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351437/metabolic-reprogramming-in-the-pathogenesis-of-chronic-lung-diseases-including-bpd-copd-and-pulmonary-fibrosis
#7
Haifeng Zhao, Phyllis A Dennery, Hongwei Yao
The metabolism of nutrient substrates including glucose, glutamine and fatty acids provides acetyl-CoA for the tricarboxylic acid cycle to generate energy, and metabolites for the biosynthesis of biomolecules including nucleotides, proteins, and lipids. It has been shown that metabolism of glucose, fatty acid, and glutamine plays important roles in modulating cellular proliferation, differentiation, apoptosis, autophagy, senescence, and inflammatory responses. All these cellular processes contribute to the pathogenesis of chronic lung diseases, including bronchopulmonary dysplasia, chronic obstructive pulmonary disease, and pulmonary fibrosis...
January 4, 2018: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29351435/effects-of-cigarette-smoke-on-pulmonary-endothelial-cells
#8
Qing Lu, Eric Gottlieb, Sharon Rounds
Cigarette smoking is the leading cause of preventable disease and death in the US. Cardiovascular co-morbidities associated with both active and secondhand cigarette smoking indicate the vascular toxicity of smoke exposure. Growing evidence supports the injurious effect of cigarette smoke on pulmonary endothelial cells and the roles of endothelial cell injury in development of Acute Respiratory Distress Syndrome (ARDS), emphysema, and pulmonary hypertension. This review summarizes results from studies of humans, preclinical animal models, and cultured endothelial cells that document toxicities of cigarette smoke exposure on pulmonary endothelial cell functions, including barrier dysfunction, endothelial activation and inflammation, apoptosis, and vasoactive mediator production...
January 4, 2018: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29351422/body-mass-specific-na-k-atpase-activity-in-the-medullary-thick-ascending-limb-implications-for-species-dependent-urine-concentrating-mechanisms
#9
Mun Aw, Tamara M Armstrong, C Michele Nawata, Sarah N Bodine, Jeeeun J Oh, Guojun Wei, Kristen K Evans, Mohammad Shahidullah, Timo Rieg, Thomas L Pannabecker
In general, mammalian whole body mass-specific metabolic rate correlates positively with maximal urine concentration (Umax) irrespective of whether or not the species have adapted to arid or mesic habitat. Accordingly, we hypothesized that the thick ascending limb (TAL) of a rodent with markedly higher whole body mass-specific metabolism than rat exhibits a substantially higher TAL metabolic rate as estimated by Na+, K+-ATPase activity and Na+, K+-ATPase α1 gene and protein expression. The kangaroo rat inner stripe of the outer medulla exhibits significantly higher mean Na+, K+-ATPase activity (~70%) compared to 2 rat strains (Sprague-Dawley and Munich-Wistar), extending prior studies showing rat activity exceeds rabbit...
January 3, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351415/amp-activated-protein-kinase-and-adenosine-are-both-metabolic-modulators-regulating-chloride-secretion-in-the-shark-rectal-gland-squalus-acanthias
#10
Rugina I Neuman, Juliette A M van Kalmthout, Daniel J Pfau, Dhariyat M Menendez, Lawrence H Young, John N Forrest
The production of endogenous adenosine during secretagogue stimulation of CFTR leads to feedback inhibition limiting further chloride secretion in the rectal gland of the dogfish shark (Squalus acanthias). In the present study, we examined the role of AMP-kinase (AMPK) as an energy sensor also modulating chloride secretion through CFTR. We found that glands perfused with forskolin and isobutylmethylxanthine (F + I), potent stimulators of chloride secretion in this ancient model, caused significant phosphorylation of the catalytic subunit Thr172 of AMPK...
December 20, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29351407/pedf-expression-affects-the-oxidative-and-inflammatory-state-of-choroidal-endothelial-cells
#11
Mitra Farnoodian, Christine M Sorenson, Nader Sheibani
Age related macular degeneration (AMD) is the leading cause of vision loss among the elderly population, and is associated with severe macular degeneration and choroidal neovascularization (CNV). Although the pathogenesis of AMD is associated with choroidal dysfunction and CNV, the detailed underlying mechanisms remain unresolved. Altered production of pigment epithelium derived factor (PEDF), a neuroprotective and anti-angiogenic factor, contributes to CNV. Furthermore, exogenous PEDF mitigates angiogenesis in preclinical CNV models...
January 10, 2018: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29351389/proliferation-of-hepatic-stellate-cells-mediated-by-yap-and-taz-contributes-to-liver-repair-and-regeneration-after-liver-ischemia-reperfusion-injury
#12
Takanori Konishi, Rebecca M Schuster, Alex B Lentsch
Yes-associated protein (YAP) and transcriptional co-activator with PDZ-binding motif (TAZ) are key regulators of cell proliferation and organ size, however, their physiological contribution after liver injury has not been fully understood. In this study, we sought to determine the role of YAP and TAZ during liver recovery after ischemia-reperfusion (I/R). A murine model of partial (70%) I/R was used to induce liver injury and study the reparative and regenerative response. After liver injury, there was marked activation and proliferation of hepatic stellate cells...
January 11, 2018: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29351368/benefit-finding-and-diurnal-cortisol-after-prostate-cancer-the-mediating-role-of-positive-affect
#13
Ashley W Wang, Michael A Hoyt
OBJECTIVE: Benefit finding (BF) has exhibited a salutary effect on psychological adjustment to cancer. However, few studies have examined its relationship with physiology or have examined BF in men with cancer. This study investigated whether BF is associated with Hypothalamic-Pituitary-Adrenal (HPA) axis activity (i.e., diurnal salivary cortisol) in men treated for prostate cancer. Positive affect (PA) is proposed as a potential pathway linking BF to diurnal salivary cortisol. METHODS: A sample of 66 men treated for localized prostate cancer within the prior two years completed questionnaires and collected salivary cortisol three times per day over three consecutive days...
January 19, 2018: Psycho-oncology
https://www.readbyqxmd.com/read/29351348/interactions-of-2-o-methyl-oligoribonucleotides-with-the-rna-models-of-the-30s-subunit-a-site
#14
Maciej Jasiński, Marta Kulik, Monika Wojciechowska, Ryszard Stolarski, Joanna Trylska
Synthetic oligonucleotides targeting functional regions of the prokaryotic rRNA could be promising antimicrobial agents. Indeed, such oligonucleotides were proven to inhibit bacterial growth. 2'-O-methylated (2'-O-Me) oligoribonucleotides with a sequence complementary to the decoding site in 16S rRNA were reported as inhibitors of bacterial translation. However, the binding mode and structures of the formed complexes, as well as the level of selectivity of the oligonucleotides between the prokaryotic and eukaryotic target, were not determined...
2018: PloS One
https://www.readbyqxmd.com/read/29351307/doxycycline-modulates-vegf-a-expression-failure-of-doxycycline-inducible-lentivirus-shrna-vector-to-knockdown-vegf-a-expression-in-transgenic-mice
#15
Mari Merentie, Riina Rissanen, Line Lottonen-Raikaslehto, Jenni Huusko, Erika Gurzeler, Mikko P Turunen, Lari Holappa, Petri Mäkinen, Seppo Ylä-Herttuala
Vascular endothelial growth factor-A (VEGF-A) is the master regulator of angiogenesis, vascular permeability and growth. However, its role in mature blood vessels is still not well understood. To better understand the role of VEGF-A in the adult vasculature, we generated a VEGF-A knockdown mouse model carrying a doxycycline (dox)-regulatable short hairpin RNA (shRNA) transgene, which silences VEGF-A. The aim was to find the critical level of VEGF-A reduction for vascular well-being in vivo. In vitro, the dox-inducible lentiviral shRNA vector decreased VEGF-A expression efficiently and dose-dependently in mouse endothelial cells and cardiomyocytes...
2018: PloS One
https://www.readbyqxmd.com/read/29351292/allocation-of-distinct-organ-fates-from-a-precursor-field-requires-a-shift-in-expression-and-function-of-gene-regulatory-networks
#16
Sneha Palliyil, Jinjin Zhu, Luke R Baker, Sarah D Neuman, Arash Bashirullah, Justin P Kumar
A common occurrence in metazoan development is the rise of multiple tissues/organs from a single uniform precursor field. One example is the anterior forebrain of vertebrates, which produces the eyes, hypothalamus, diencephalon, and telencephalon. Another instance is the Drosophila wing disc, which generates the adult wing blade, the hinge, and the thorax. Gene regulatory networks (GRNs) that are comprised of signaling pathways and batteries of transcription factors parcel the undifferentiated field into discrete territories...
January 19, 2018: PLoS Genetics
https://www.readbyqxmd.com/read/29351266/from-extraction-of-local-structures-of-protein-energy-landscapes-to-improved-decoy-selection-in-template-free-protein-structure-prediction
#17
Nasrin Akhter, Amarda Shehu
Due to the essential role that the three-dimensional conformation of a protein plays in regulating interactions with molecular partners, wet and dry laboratories seek biologically-active conformations of a protein to decode its function. Computational approaches are gaining prominence due to the labor and cost demands of wet laboratory investigations. Template-free methods can now compute thousands of conformations known as decoys, but selecting native conformations from the generated decoys remains challenging...
January 19, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29351262/imu-to-segment-assignment-and-orientation-alignment-for-the-lower-body-using-deep-learning
#18
Tobias Zimmermann, Bertram Taetz, Gabriele Bleser
Human body motion analysis based on wearable inertial measurement units (IMUs) receives a lot of attention from both the research community and the and industrial community. This is due to the significant role in, for instance, mobile health systems, sports and human computer interaction. In sensor based activity recognition, one of the major issues for obtaining reliable results is the sensor placement/assignment on the body. For inertial motion capture (joint kinematics estimation) and analysis, the IMU-to-segment (I2S) assignment and alignment are central issues to obtain biomechanical joint angles...
January 19, 2018: Sensors
https://www.readbyqxmd.com/read/29351213/cyclin-b3-deficiency-impairs-germline-stem-cell-maintenance-and-its-overexpression-delays-cystoblast-differentiation-in-drosophila-ovary
#19
Dongsheng Chen, Lijuan Zhou, Fuling Sun, Mingzhong Sun, Xiaoqian Tao
It is well known that cyclinB3 (cycB3) plays a key role in the control of cell cycle progression. However, whether cycB3 is involved in stem cell fate determination remains unknown. The Drosophila ovary provides an exclusive model for studying the intrinsic and extrinsic factors that modulate the fate of germline stem cells (GSCs). Here, using this model, we show that DrosophilacycB3 plays a new role in controlling the fate of germline stem cells (GSC). Results from cycB3 genetic analyses demonstrate that cycB3 is intrinsically required for GSC maintenance...
January 19, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29351212/changes-in-the-expression-of-aqp4-and-aqp9-in-the-hippocampus-following-eclampsia-like-seizure
#20
Xinjia Han, Qian Huang, Lei Liu, Xiaoyan Sha, Bihui Hu, Huishu Liu
Eclampsia is a hypertensive disorder of pregnancy that is defined by the new onset of grand mal seizures on the basis of pre-eclampsia. Until now, the mechanisms underlying eclampsia were poorly understood. Brain edema is considered a leading cause of eclamptic seizures; aquaporins (AQP4 and AQP9), the glial water channel proteins mainly expressed in the nervous system, play an important role in brain edema. We studied AQP4 and AQP9 expression in the hippocampus of pre-eclamptic and eclamptic rats in order to explore the molecular mechanisms involved in brain edema...
January 19, 2018: International Journal of Molecular Sciences
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