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https://www.readbyqxmd.com/read/28645211/akr1c3-mediated-adipose-androgen-generation-drives-lipotoxicity-in-women-with-polycystic-ovary-syndrome
#1
Michael W O'Reilly, Punith Kempegowda, Mark Walsh, Angela E Taylor, Konstantinos N Manolopoulos, J William Allwood, Robert K Semple, Daniel Hebenstreit, Warwick B Dunn, Jeremy W Tomlinson, Wiebke Arlt
Context: Polycystic ovary syndrome (PCOS) is a prevalent metabolic disorder, occurring in up to 10% of women of reproductive age. PCOS is associated with insulin resistance and cardiovascular risk. Androgen excess is a defining feature of PCOS and has been suggested as causally associated with insulin resistance; however, mechanistic evidence linking both is lacking. We hypothesized that adipose tissue is an important site linking androgen activation and metabolic dysfunction in PCOS...
June 22, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28645209/genome-wide-mapping-of-in-vivo-er%C3%AE-binding-sites-in-male-mouse-efferent-ductules
#2
Guangxin Yao, Shuanggang Hu, Lu Yu, Yanfei Ru, Charlie Degui Chen, Qiang Liu, Yonglian Zhang
As an important nuclear hormone receptor, estrogen receptor alpha (ERα), which is encoded by Esr1 gene, regulates the expression of hundreds of genes in a stimulus-specific, temporal and tissue-specific fashion, mainly by binding to specific DNA sequences-estrogen response elements (EREs). As an important estrogen target tissue in males, the function of the efferent ductules relies on the presence of the ERα protein, but the underlying regulatory mechanisms are poorly illustrated. In this study, genome-wide ERα-binding sites in mouse efferent ductules were mapped by ChIP-seq...
June 22, 2017: Endocrinology
https://www.readbyqxmd.com/read/28645198/diabetes-specific-and-general-life-stress-and-glycemic-outcomes-in-emerging-adults-with-type-1-diabetes-is-race-ethnicity-a-moderator
#3
Ashley M Butler, Bridget E Weller, Joyce P Yi-Frazier, Kelly Fegan-Bohm, Barbara Anderson, Catherine Pihoker, Marisa E Hilliard
This study examines whether race/ethnicity moderates relationships of (a) diabetes stress and general life stressors with (b) diabetes outcomes of glycemic control and diabetic ketoacidosis (DKA) among emerging adults (aged 18-25 years) with type 1 diabetes (T1D). Using a T1D Exchange Registry sample of non-Hispanic White, African American, and Hispanic emerging adults ( N  = 3,440), multiple group analyses were used to determine whether race/ethnicity moderates the relationships between stress and diabetes outcomes...
June 22, 2017: Journal of Pediatric Psychology
https://www.readbyqxmd.com/read/28645189/the-potential-role-of-retinoic-acid-receptor-%C3%AE-on-glomerulosclerosis-in-rats-and-podocytes-injury-is-associated-with-the-induction-of-mmp2-and-mmp9
#4
Xiuping Chen, Yuanhan Qin, Tianbiao Zhou, Ling Jiang, Fengying Lei, He Qin, Lei Zhang, Zhiqiang Zhou
Retinoic acid receptor α (RARα) plays a crucial role in kidney disease. However, the underlying mechanisms in glomerulosclerosis (GS) is still not clear. The roles of RARα in an adriamycin (ADR)-induced GS rat model and in ADR-induced podocyte injury in vitro were investigated. RARα was over-expressed in GS rats, and serum, urine and kidney samples were collected to detect the induction of the expression of the receptor. RARα expression was inhibited and/or over-expressed in cultured podocytes following injury, as demonstrated by morphometric assays, cell toxicity, and matrix metalloproteinase (MMP) enzymatic activity...
June 22, 2017: Acta Biochimica et Biophysica Sinica
https://www.readbyqxmd.com/read/28645186/igf-i-gene-therapy-in-aging-rats-modulates-hippocampal-genes-relevant-to-memory-function
#5
Joaquín Pardo, Martin C Abba, Ezequiel Lacunza, Olalekan M Ogundele, Isabel Paiva, Gustavo R Morel, Tiago F Outeiro, Rodolfo G Goya
In rats, learning and memory performance decline during normal aging, which makes this rodent species a suitable model to evaluate therapeutic strategies. In aging rats, insulin-like growth factor-I (IGF-I), is known to significantly improve spatial memory accuracy as compared to control counterparts. A constellation of gene expression changes underlie the hippocampal phenotype of aging but no studies on the effects of IGF-I on the hippocampal transcriptome of old rodents have been documented. Here, we assessed the effects of IGF-I gene therapy on spatial memory performance in old female rats and compared them with changes in the hippocampal transcriptome...
June 22, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28645180/alcohol-metabolism-and-oesophageal-cancer-a-systematic-review-of-the-evidence
#6
Marco Matejcic, M J Gunter, Pietro Ferrari
Alcohol is a major risk factor for oesophageal squamous cell carcinoma (OSCC), the most prevalent histological subtype of oesophageal cancer (OC) worldwide. The metabolism of alcohol is regulated by specific enzymes whose activity and expression is influenced by genetic polymorphisms. We conducted a systematic review of current epidemiological evidence of the relationship between alcohol intake and OC risk, including the role of tobacco smoking and functional polymorphisms of dehydrogenases (ADHs) and aldehyde dehydrogenases (ALDHs)...
June 22, 2017: Carcinogenesis
https://www.readbyqxmd.com/read/28645179/system-wide-analysis-of-short-term-response-to-high-temperature-in-pinus-radiata
#7
Mónica Escandón, Luis Valledor, Jesús Pascual, Gloria Pinto, María Jesús Cañal, Mónica Meijón
Pinus radiata seedlings, the most widely planted pine species in the world, were exposed to temperatures within a range mimicking future scenarios based on current models of heat increase. The short-term heat response in P. radiata was studied in detail by exploring the metabolome, proteome and targeted transcriptome. The use of complementary mass spectrometry techniques, GC-MS and LC-Orbitrap-MS, together with novel bioinformatics tools allowed the reliable quantification of 2,075 metabolites and 901 protein groups...
June 22, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28645178/ecological-imperatives-for-aquatic-carbon-dioxide-concentrating-mechanisms
#8
Stephen C Maberly, Brigitte Gontero
In aquatic environments, the concentration of inorganic carbon is spatially and temporally variable and CO2 can be substantially oversaturated or depleted. Depletion of CO2 plus low rates of diffusion cause inorganic carbon to be more limiting in aquatic than terrestrial environments, and the frequency of species with a CO2-concentrating mechanism (CCM), and their contribution to productivity, is correspondingly greater. Aquatic photoautotrophs may have biochemical or biophysical CCMs and exploit CO2 from the sediment or the atmosphere...
June 22, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28645175/perturbation-to-cholesterol-at-the-neuromuscular-junction-confers-botulinum-neurotoxin-a-sensitivity-to-neonatal-mice
#9
Baskaran Thyagarajan, Joseph G Potian, Joseph J McArdle, Padmamalini Baskaran
Botulinum neurotoxin A (BoNT/A) cleaves SNAP25 at the motor nerve terminals (MNT) and inhibits stimulus evoked acetylcholine release (SEAR). This causes skeletal muscle paralysis. However, younger neonatal mice (<P7; less than 7 days old) are resistant to the neuroparalytic effects of BoNT/A. That is, in vivo injection of BoNT/A at the innervations of Extensor digitorum longus (EDL) muscle in the hindlimbs inhibited the toe spread reflex within 24 hours following BoNT/A injection in adult mouse and in older (> P7) neonatal mice younger than 7 days-age remained unaffected by BoNT/A injection...
June 22, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28645172/the-biogenesis-pathway-of-trna-derived-pirnas-in-bombyx-germ-cells
#10
Shozo Honda, Takuya Kawamura, Phillipe Loher, Keisuke Morichika, Isidore Rigoutsos, Yohei Kirino
Transfer RNAs (tRNAs) function in translational machinery and further serves as a source of short non-coding RNAs (ncRNAs). tRNA-derived ncRNAs show differential expression profiles and play roles in many biological processes beyond translation. Molecular mechanisms that shape and regulate their expression profiles are largely unknown. Here, we report the mechanism of biogenesis for tRNA-derived Piwi-interacting RNAs (td-piRNAs) expressed in Bombyx BmN4 cells. In the cells, two cytoplasmic tRNA species, tRNAAspGUC and tRNAHisGUG, served as major sources for td-piRNAs, which were derived from the 5΄-part of the respective tRNAs...
June 22, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28645160/chronic-pseudomonas-aeruginosa-biofilm-infection-impairs-murine-s100a8-a9-and-neutrophil-effector-cytokines-implications-for-delayed-wound-closure
#11
Hannah Trøstrup, Christian Johann Lerche, Lars Jackie Christophersen, Kim Thomsen, Peter Østrup Jensen, Hans Petter Hougen, Niels Høiby, Claus Moser
The impact of Pseudomonas aeruginosa biofilm infections in chronic wounds and clinical implication for healing is receiving increased attention. However, the pathophysiology of host/pathogen interplay is not fully understood. By further revealing the mechanisms, necessary new treatment strategies may be identified. Since the background for chronic wounds is diverse, representative animal models are important. We assessed host response and spontaneous wound closure in the relatively resistant C3H/HeN and the susceptible BALB/c mouse strain...
June 22, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28645158/the-potential-for-co-evolution-of-co2-concentrating-mechanisms-and-rubisco-in-diatoms
#12
Jodi N Young, Brian M Hopkinson
Diatoms are a diverse group of unicellular algae that contribute significantly to global photosynthetic carbon fixation and export in the modern ocean, and are an important source of microfossils for paleoclimate reconstructions. Because of their importance in the environment, diatoms have been a focus of study on the physiology and ecophysiology of carbon fixation, in particular their CO2-concentrating mechanisms (CCMs) and Rubisco characteristics. While carbon fixation in diatoms is not as well understood as in certain model aquatic photoautotrophs, a greater number of species have been examined in diatoms...
June 22, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28645146/analysis-of-in-vitro-evolution-reveals-the-underlying-distribution-of-catalytic-activity-among-random-sequences
#13
Abe Pressman, Janina E Moretti, Gregory W Campbell, Ulrich F Müller, Irene A Chen
The emergence of catalytic RNA is believed to have been a key event during the origin of life. Understanding how catalytic activity is distributed across random sequences is fundamental to estimating the probability that catalytic sequences would emerge. Here, we analyze the in vitro evolution of triphosphorylating ribozymes and translate their fitnesses into absolute estimates of catalytic activity for hundreds of ribozyme families. The analysis efficiently identified highly active ribozymes and estimated catalytic activity with good accuracy...
June 21, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28645141/does-the-seed-bank-contribute-to-the-build-up-of-a-genetic-extinction-debt-in-the-grassland-perennial-campanula-rotundifolia
#14
Jan Plue, Katrien Vandepitte, Olivier Honnay, Sara A O Cousins
Background and Aims: Habitat fragmentation threatens global biodiversity. Many plant species persist in habitat fragments via persistent life cycle stages such as seed banks, generating a species extinction debt. Here, seed banks are hypothesized to cause a temporal delay in the expected loss of genetic variation, which can be referred to as a genetic extinction debt, as a possible mechanism behind species extinction debts. Methods: Fragmented grassland populations of Campanula rotundifolia were examined for evidence of a genetic extinction debt, investigating if the seed bank contributed to the extinction debt build-up...
June 21, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28645137/-to-take-or-not-to-take-the-association-between-perceived-addiction-risk-expected-analgesic-response-and-likelihood-of-trying-novel-pain-relievers-in-self-identified-chronic-pain-patients
#15
D Andrew Tompkins, Andrew S Huhn, Patrick S Johnson, Michael T Smith, Eric C Strain, Robert R Edwards, Matthew W Johnson
BACKGROUND AND AIMS: Probability discounting refers to the effect of outcome uncertainty on decision making. Using probability discounting, we examined the degree to which self-identified chronic pain patients (CPP) were likely to try a novel analgesic medication given increasing addiction risk. We postulated that propensity for opioid misuse, trait impulsivity, and previous opioid experience would be positively associated with likelihood of risky medication use. DESIGN: This cross-sectional online study determined state/trait associations with addiction-related medication decisions in CPP...
June 23, 2017: Addiction
https://www.readbyqxmd.com/read/28645116/the-additive-effects-of-the-tm6sf2-e167k-and-pnpla3-i148m-polymorphisms-on-lipid-metabolism
#16
Lizhen Chen, Shuixian Du, Linlin Lu, Zhonghua Lin, Wenwen Jin, Doudou Hu, Xiangjun Jiang, Yongning Xin, Shiying Xuan
There is a genetic susceptibility for nonalcoholic fatty liver disease (NAFLD). To examine the role of genetic factors in the disease, a Bayesian analysis was performed to model gene relationships in NAFLD pathogenesis. The Bayesian analysis indicated a potential gene interaction between the TM6SF2 and PNPLA3 genes. Next, to explore the underlying mechanism at the cellular level, we evaluated the additive effects between the TM6SF2 E167K and PNPLA3 I148M polymorphisms on lipid metabolism. Hepa 1-6 cells were transfected with a control vector or with overexpression vectors for TM6SF2/PNPLA3-wild type, TM6SF2-mutant type, PNPLA3-mutant type, or TM6SF2/PNPLA3-mutant type...
June 14, 2017: Oncotarget
https://www.readbyqxmd.com/read/28645115/a-comprehensive-review-of-heregulins-her3-and-her4-as-potential-therapeutic-targets-in-cancer
#17
REVIEW
Jose Mauricio Mota, Katharine Ann Collier, Ricardo Lima Barros Costa, Timothy Taxter, Aparna Kalyan, Caio A Leite, Young Kwang Chae, Francis J Giles, Benedito A Carneiro
Heregulins (HRGs) bind to the receptors HER3 or HER4, induce receptor dimerization, and trigger downstream signaling that leads to tumor progression and resistance to targeted therapies. Increased expression of HRGs has been associated with worse clinical prognosis; therefore, attempts to block HRG-dependent tumor growth have been pursued. This manuscript summarizes the function and signaling of HRGs and review the preclinical evidence of its involvement in carcinogenesis, prognosis, and treatment resistance in several malignancies such as colorectal cancer, non-small cell lung cancer, ovarian cancer, and breast cancer...
June 13, 2017: Oncotarget
https://www.readbyqxmd.com/read/28645111/intersecting-transcriptomic-profiling-technologies-and-long-non-coding-rna-function-in-lung-adenocarcinoma-discovery-mechanisms-and-therapeutic-applications
#18
REVIEW
Jonathan Castillo, Theresa R Stueve, Crystal N Marconett
Previously thought of as junk transcripts and pseudogene remnants, long non-coding RNAs (lncRNAs) have come into their own over the last decade as an essential component of cellular activity, regulating a plethora of functions within multicellular organisms. lncRNAs are now known to participate in development, cellular homeostasis, immunological processes, and the development of disease. With the advent of next generation sequencing technology, hundreds of thousands of lncRNAs have been identified. However, movement beyond mere discovery to the understanding of molecular processes has been stymied by the complicated genomic structure, tissue-restricted expression, and diverse regulatory roles lncRNAs play...
June 9, 2017: Oncotarget
https://www.readbyqxmd.com/read/28645103/colxv-promotes-adipocyte-differentiation-via-inhibiting-dna-methylation-and-camp-pka-pathway-in-mice
#19
Guannv Liu, Meihang Li, Yatao Xu, Song Wu, Muhammad Saeed, Chao Sun
Extracellular matrix (ECM), as an essential component of adipose tissue, not only provides mechanical support for adipocyte growth, but also participates in ECM-adipocyte communication via various secreted proteins, including highly enriched collagens. Collagen XV (ColXV) is a secreted non-fibrillar collagen within ECM Basement Membrane (BM) zones and well recognized as a tumor suppressor. However, the role of ColXV in adipose tissue is still unknown. In this study, high fat diet (HFD) fed mice were used as obese model, in which we deeply investigated the interaction between ColXV and adipocyte differentiation or adipose metabolism...
June 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28645102/expression-of-p63-and-cd44-in-oral-squamous-cell-carcinoma-and-correlation-with-clinicopathological-parameters
#20
Nasrollah Saghravanian, Kazem Anvari, Narges Ghazi, Bahram Memar, Maryam Shahsavari, Monavar Afzal Aghaee
Squamous cell carcinoma (SCC) is the sixth most frequent malignant tumor of the head and neck region. Despite advances in therapeutic options over the last decades, the rate of mortality and morbidity has not been improved markedly. A small subset of cells, cancer stem cells (CSCs), with self-renewal properties have become a major focus of current cancer research. CD44 and p63 are identified as candidate stem cell markers in normal squamous epithelium and SCC. The role of these markers in oral squamous cell carcinoma (OSCC) is still debatable...
June 15, 2017: Archives of Oral Biology
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