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Hypoxia and diabetes

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https://www.readbyqxmd.com/read/29332196/bioelectronic-modulation-of-carotid-sinus-nerve-activity-in-the-rat-a-potential-therapeutic-approach-for-type-2-diabetes
#1
Joana F Sacramento, Daniel J Chew, Bernardete F Melo, Matteo Donegá, Wesley Dopson, Maria P Guarino, Alison Robinson, Jesus Prieto-Lloret, Sonal Patel, Bradley J Holinski, Nishan Ramnarain, Victor Pikov, Kristoffer Famm, Silvia V Conde
AIMS/HYPOTHESIS: A new class of treatments termed bioelectronic medicines are now emerging that aim to target individual nerve fibres or specific brain circuits in pathological conditions to repair lost function and reinstate a healthy balance. Carotid sinus nerve (CSN) denervation has been shown to improve glucose homeostasis in insulin-resistant and glucose-intolerant rats; however, these positive effects from surgery appear to diminish over time and are heavily caveated by the severe adverse effects associated with permanent loss of chemosensory function...
January 14, 2018: Diabetologia
https://www.readbyqxmd.com/read/29330944/improvement-of-islet-function-and-survival-by-integration-of-perfluorodecalin-into-microcapsules-in-vivo-and-in-vitro
#2
Sang-Ho Lee, Heon-Seok Park, Yeoree Yang, Eun-Young Lee, Ji-Won Kim, Gilson Khang, Kun-Ho Yoon
Hypoxic injury of islets is a major obstacle for encapsulated islet transplantation into the peritoneal cavity. To improve oxygen delivery to encapsulated islets, we integrated 20% of the oxygen carrier material, perfluorodecalin (PFD), in alginate capsules mixed with islets (PFD-alginate). Integration of PFD clearly improved islet viability and decreased reactive oxygen species production compared to islets encapsulated with alginate only (alginate) and naked islets exposed to hypoxia in vitro. In PFD-alginate capsules, HIF-1α expression was minimal, and insulin expression was well maintained...
January 12, 2018: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29325997/reduced-cortical-oxygenation-predicts-a-progressive-decline-of-renal-function-in-patients-with-chronic-kidney-disease
#3
Menno Pruijm, Bastien Milani, Edward Pivin, Agata Podhajska, Bruno Vogt, Matthias Stuber, Michel Burnier
Renal tissue hypoxia is a final pathway in the development and progression of chronic kidney disease (CKD), but whether renal oxygenation predicts renal function decline in humans has not been proven. Therefore, we performed a prospective study and measured renal tissue oxygenation by blood oxygenation level-dependent magnetic resonance imaging (BOLD-MRI) in 112 patients with CKD, 47 with hypertension without CKD, and 24 healthy control individuals. Images were analyzed with the twelve-layer concentric objects method that divided the renal parenchyma in 12 layers of equal thickness and reports the mean R2* value of each layer (a high R2* corresponds to low oxygenation), along with the change in R2* between layers called the R2* slope...
January 9, 2018: Kidney International
https://www.readbyqxmd.com/read/29306907/new-aspects-in-the-pathomechanism-of-diseases-of-civilization-particularly-psychosomatic-disorders-part-2-chronic-hypocapnia-and-hypercapnia-in-the-medical-practice
#4
Andras Sikter, Zoltan Rihmer, Roberto de Guevara
The authors seek to find new connections between recent results of biology and older theories. This paper aims to assemble the jigsaw puzzle. The theoretical background of the hypothesis was described in the previous issue of the journal (Sikter et al. 2017a). Human stress response often coexists with persistent hypocapnia or hypercapnia - developing via psychosomatic pathomechanism - which can lead to mental and psychosomatic illnesses. Chronic hypocapnia mainly generates hyperarousal disorders which may be reversible for an extended time, however, vicious cycles may start when hypoxia and/or severe somatic diseases are simultaneously present (commonly in the elderly), which conditions often end with death without medical help...
September 2017: Neuropsychopharmacologia Hungarica
https://www.readbyqxmd.com/read/29303230/planned-birth-at-or-near-term-for-improving-health-outcomes-for-pregnant-women-with-gestational-diabetes-and-their-infants
#5
REVIEW
Linda M Biesty, Aoife M Egan, Fidelma Dunne, Eugene Dempsey, Pauline Meskell, Valerie Smith, G Meabh Ni Bhuinneain, Declan Devane
BACKGROUND: Gestational diabetes is a type of diabetes that occurs during pregnancy. Women with gestational diabetes are more likely to experience adverse health outcomes such as pre-eclampsia or polyhydramnios (excess amniotic fluid). Their babies are also more likely to have health complications such as macrosomia (birthweight > 4000 g) and being large-for-gestational age (birthweight above the 90th percentile for gestational age). Current clinical guidelines support elective birth, at or near term in women with gestational diabetes to minimise perinatal complications, especially those related to macrosomia...
January 5, 2018: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29298418/neuronal-pas-domain-protein-4-suppression-of-oxygen-sensing-optimizes-metabolism-during-excitation-of-neuroendocrine-cells
#6
Paul V Sabatini, Thilo Speckmann, Cuilan Nian, Maria M Glavas, Chi Kin Wong, Ji Soo Yoon, Tatsuya Kin, A M James Shapiro, William T Gibson, C Bruce Verchere, Francis C Lynn
Depolarization of neuroendocrine cells results in calcium influx, which induces vesicle exocytosis and alters gene expression. These processes, along with the restoration of resting membrane potential, are energy intensive. We hypothesized that cellular mechanisms exist to maximize energy production during excitation. Here, we demonstrate that NPAS4, an immediate early basic helix-loop-helix (bHLH)-PAS transcription factor, acts to maximize energy production by suppressing hypoxia-inducible factor 1α (HIF1α)...
January 2, 2018: Cell Reports
https://www.readbyqxmd.com/read/29296174/a-novel-thiazolidinediones-atzd2-rescues-memory-deficits-in-a-rat-model-of-type-2-diabetes-through-antioxidant-and-antiinflammation
#7
Xuan-Kang Wang, Ting Sun, Yu-Jiao Li, Yu-Hong Wang, Yan-Jiao Li, Liu-Di Yang, Dan Feng, Ming-Gao Zhao, Yu-Mei Wu
Type 2 diabetes (T2DM) has been associated with learning and memory impairment; however, drugs for diabetes could not prevent the development of cognitive decline in T2DM patients. In the present study, compounds derived from thiazolidinediones (TZD), a PPAR-γ agonist, were synthesized by conjuncting the alkyl-substituted benzimidazole group to TZD group (ATZDs). Based on the in vitro evaluation, the neuroprotection of ATZD2 was further investigated using a streptozotocin-induced T2DM rat model. Pharmacokinetic study showed that ATZD2 could pass the blood-brain barrier (BBB) while the rosiglitazone (RSG, the precursor compound of ATZD2) not...
December 8, 2017: Oncotarget
https://www.readbyqxmd.com/read/29286387/establishment-of-an-extracellular-acidic-ph-culture-system
#8
Ayano Kondo, Tsuyoshi Osawa
Conditions of the tumor microenvironment, such as hypoxia or nutrient starvation, play critical roles in cancer progression and malignancy. However, the role of acidic extracellular pH in tumor aggressiveness and its underlying mechanism has not been extensively studied compared to hypoxic or nutrient starvation conditions. In addition, a well-defined culture method to mimic the acidic extracellular tumor microenvironment has not been fully reported. Here we present a simple in vitro culture method to maintain acidic extracellular pH using reduced bicarbonate and increased lactate or HCl concentrations in the culture medium...
November 19, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29286031/-increase-of-reparative-potential-of-fabrics-in-sugar-diabetes
#9
A P Vlasov, P P Zaitsev, P A Vlasov, V A Bolotskikh, A G Grigoriev, T I Vlasova, O A Karpunkin
AIM: The purpose of the study was to study the effectiveness of the domestic drug Remaxol in reparative processes of laparotomic wound tissues in acute surgical abdominal pathology in patients with diabetes mellitus. MATERIAL AND METHODS: Clinical and laboratory studies were performed in 86 patients with acute surgical pathology of the abdominal cavity, 56 patients with type 1 diabetes mellitus, including 26 patients who received Remaxol in the early postoperative period (daily intravenous infusions of 400...
2017: Khirurgiia
https://www.readbyqxmd.com/read/29284676/coordinated-regulation-of-intracellular-ph-by-two-glucose-sensing-pathways-in-yeast
#10
Daniel G Isom, Stephani C Page, Leonard B Collins, Nicholas J Kapolka, Geoffrey J Taghon, Henrik G Dohlman
The yeast Saccharomyces cerevisiae employs multiple pathways to coordinate sugar availability and metabolism. Glucose and other sugars are detected by a G protein coupled receptor, Gpr1, as well as a pair of transporter-like proteins, Rgt2 and Snf3. When glucose is limiting however, an ATP-driven proton pump (Pma1) is inactivated leading to a marked decrease in cytoplasmic pH. Here we determine the relative contribution of the two sugar sensing pathways to pH regulation. Whereas cytoplasmic pH is strongly dependent on glucose abundance, and is regulated by both glucose-sensing pathways, ATP is largely unaffected and therefore cannot account for the changes in Pma1 activity...
December 28, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29278702/hypoxia-potentiates-lps-induced-inflammatory-response-and-increases-cell-death-by-promoting-nlrp3-inflammasome-activation-in-pancreatic-%C3%AE-cells
#11
Cheng Chen, Xiaoqian Ma, Cejun Yang, Wei Nie, Juan Zhang, Hongde Li, Pengfei Rong, Shounan Yi, Wei Wang
Hypoxia and islet inflammation are involved in β-cell failure in type 2 diabetes (T2D). Elevated plasma LPS levels have been verified in patients with T2D, and hypoxia occurs in islets of diabetic mice. Activation of inflammasomes in ischemic or hypoxic conditions was identified in various tissues. Here, we investigated whether hypoxia activates the inflammasome in β cells and the possible mechanisms involved. In mouse insulinoma cell line 6 (MIN6), hypoxia (1% O2) primes the NLRP3 inflammasome along with NF-κB signaling activation...
December 23, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29251202/cd15-as-a-marker-of-fetoplacental-endothelial-immaturity-in-iugr-placentas
#12
Gayatri Ravikumar, Julian Crasta, Jyothi S Prabhu, Tinku Thomas, Pratibha Dwarkanath, Annamma Thomas, Anura V Kurpad, Tirumalai Srinivas Sridhar
BACKGROUND: Structural or functional defects in the placenta, are the primary cause of growth restriction of the fetus. Morphological examination of such placentas from intrauterine growth restricted (IUGR) fetuses often appears deceptively normal. Evaluation of angiogenesis and fetoplacental vasculature is critical to understand the underlying pathogenesis of fetal growth restriction in both idiopathic as well as cases where it is thought to be secondary to complications like preeclampsia (PE)...
December 17, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29248329/vascular-endothelial-growth-factors-and-placenta-growth-factor-in-retinal-vasculopathies-current-research-and-future-perspectives
#13
Joana Mesquita, João Paulo Castro-de-Sousa, Sara Vaz-Pereira, Arminda Neves, Luís A Passarinha, Cândida T Tomaz
Vision loss due to disease or degeneration of the eye (retina, choroid, retinal veins, or macula) is a leading cause of blindness worldwide. In most cases, vision-threatening ocular diseases are accompanied by abnormal changes in the vasculature of the eye, especially the retina, and these conditions are collectively referred to as retinal vasculopathies. Impaired blood supply or hypoxia stimulates angiogenesis in the vascular and non-vascular sections of the eye, which results in neovascularization, leading to conditions such as diabetic retinopathy or age-related macular degeneration...
December 7, 2017: Cytokine & Growth Factor Reviews
https://www.readbyqxmd.com/read/29210999/adverse-intrauterine-environment-and-cardiac-mirna-expression
#14
REVIEW
Mitchell C Lock, Kimberley J Botting, Ross L Tellam, Doug Brooks, Janna L Morrison
Placental insufficiency, high altitude pregnancies, maternal obesity/diabetes, maternal undernutrition and stress can result in a poor setting for growth of the developing fetus. These adverse intrauterine environments result in physiological changes to the developing heart that impact how the heart will function in postnatal life. The intrauterine environment plays a key role in the complex interplay between genes and the epigenetic mechanisms that regulate their expression. In this review we describe how an adverse intrauterine environment can influence the expression of miRNAs (a sub-set of non-coding RNAs) and how these changes may impact heart development...
December 6, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29207534/effects-of-the-macular-carotenoid-lutein-in-human-retinal-pigment-epithelial-cells
#15
Xiaoming Gong, Christian S Draper, Geoffrey S Allison, Raju Marisiddaiah, Lewis P Rubin
Retinal pigment epithelial (RPE) cells are central to retinal health and homoeostasis. Oxidative stress-induced damage to the RPE occurs as part of the pathogenesis of age-related macular degeneration and neovascular retinopathies (e.g., retinopathy of prematurity, diabetic retinopathy). The xanthophyll carotenoids, lutein and zeaxanthin, are selectively taken up by the RPE, preferentially accumulated in the human macula, and transferred to photoreceptors. These macular xanthophylls protect the macula (and the broader retina) via their antioxidant and photo-protective activities...
December 4, 2017: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/29204447/effects-of-lncrna-bc168687-sirna-on-diabetic-neuropathic-pain-mediated-by-p2x7-receptor-on-sgcs-in-drg-of-rats
#16
Chenglong Liu, Jia Tao, Hui Wu, Yixin Yang, Qiang Chen, Zeyu Deng, Jiandi Liu, Changshui Xu
Diabetic neuropathic pain (DNP), one of the early symptoms of diabetic neuropathy, relates to metabolic disorders induced by high blood glucose, neurotrophic vascular ischemia and hypoxia, and autoimmune factors. This study was aimed at exploring the effects of long noncoding RNA (lncRNA) BC168687 siRNA on DNP mediated by P2X7 receptor on SGCs in DRG of rats. The mechanical withdrawal threshold (MWT) and thermal withdrawal latency (TWL) of rats, the expression levels of P2X7 mRNA and protein in the DRG, and nitric oxide (NO) in the serum were, respectively, detected in our study...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29203573/mechanisms-of-%C3%AE-cell-dedifferentiation-in-diabetes-recent-findings-and-future-research-directions
#17
Mohammed Bensellam, Jean-Christophe Jonas, D Ross Laybutt
Like all the cells of an organism, pancreatic β-cells originate from embryonic stem cells through a complex cellular process termed differentiation. Differentiation involves the coordinated and tightly controlled activation/repression of specific effectors and gene clusters in a time-dependent fashion thereby giving rise to particular morphological and functional cellular features. Interestingly, cellular differentiation is not a unidirectional process. Indeed, growing evidence suggests that under certain conditions, mature β-cells can lose, to various degrees, their differentiated phenotype and cellular identity and regress to a less differentiated or a precursor-like state...
December 4, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/29200863/endothelial-dysfunction-assessment-by-flow-mediated-dilation-in-a-high-altitude-population
#18
Walter S Calderón-Gerstein, Antonio López-Peña, Raúl Macha-Ramírez, Astrid Bruno-Huamán, Roxana Espejo-Ramos, Stephany Vílchez-Bravo, María Ramírez-Breña, Milagros Damián-Mucha, Adriana Matos-Mucha
Introduction: Endothelial function at high altitude has been measured only in populations that are genetically adapted to chronic hypoxia. The objective of this study was to evaluate endothelial dysfunction (ED) in a nongenetically adapted high-altitude population of the Andes mountains, in Huancayo, Peru (3,250 meters above sea level). Methods: Participants included 61 patients: 28 cases and 33 controls. The cases were subjects with hypertension, diabetes mellitus, obesity, or a history of stroke or coronary artery disease...
2017: Vascular Health and Risk Management
https://www.readbyqxmd.com/read/29177891/plasma-levels-of-hypoxia-regulated-factors-in-patients-with-age-related-macular-degeneration
#19
Zygoula Ioanna, Schori Christian, Grimm Christian, Barthelmes Daniel
PURPOSE: Various hypoxia-related proteins are differentially expressed in the retina and secreted to the vitreous and/or aqueous humor of patients affected by dry or neovascular age-related macular degeneration (nAMD). To determine whether these conditions alter concentrations of cytokines also in the systemic circulation, we measured plasma levels of six hypoxia-related proteins. METHODS: Plasma was prepared from EDTA blood that was collected from patients affected by dry AMD (n = 5), nAMD (n = 11), proliferative diabetic retinopathy (PDR; n = 9), and patients with an epiretinal membrane (ERM; n = 11)...
November 25, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/29171483/-intermittent-hypoxia-due-to-sleep-apnea-syndrome-in-patients-with-type-2-diabetes-mellitus
#20
D I Burchakov, A Yu Mayorov
OBJECTIVES: To evaluate the possible association between intermittent hypoxia (IH) and HbA1c in patients with insufficient control type of 2 diabetes mellitus (T2DM). MATERIAL AND METHODS: In this cross-sectional study 183 patients with HbAc1≥7% underwent three-channel overnight monitoring (ApneaLink) and completed Berlin Questionnaire, Epworth Sleepiness Scale and Pittsburgh Sleep Quality Index. Patients were divided in two groups, based on the cut-off value of oxygen desaturation index≥15...
2017: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
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