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Physiology water homeostasis

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https://www.readbyqxmd.com/read/28920920/er-associated-degradation-is-required-for-vasopressin-prohormone-processing-and-systemic-water-homeostasis
#1
Guojun Shi, Diane Somlo, Geun Hyang Kim, Cristina Prescianotto-Baschong, Shengyi Sun, Nicole Beuret, Qiaoming Long, Jonas Rutishauser, Peter Arvan, Martin Spiess, Ling Qi
Peptide hormones are crucial regulators of many aspects of human physiology. Mutations that alter these signaling peptides are associated with physiological imbalances that underlie diseases. However, the conformational maturation of peptide hormone precursors (prohormones) in the ER remains largely unexplored. Here, we report that conformational maturation of proAVP, the precursor for the antidiuretic hormone arginine-vasopressin, within the ER requires the ER-associated degradation (ERAD) activity of the Sel1L-Hrd1 protein complex...
September 18, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28871493/plant-and-animal-aquaporins-crosstalk-what-can-be-revealed-from-distinct-perspectives
#2
REVIEW
Moira Sutka, Gabriela Amodeo, Marcelo Ozu
Aquaporins (AQPs) can be revisited from a distinct and complementary perspective: the outcome from analyzing them from both plant and animal studies. (1) The approach in the study. Diversity found in both kingdoms contrasts with the limited number of crystal structures determined within each group. While the structure of almost half of mammal AQPs was resolved, only a few were resolved in plants. Strikingly, the animal structures resolved are mainly derived from the AQP2-lineage, due to their important roles in water homeostasis regulation in humans...
September 4, 2017: Biophysical Reviews
https://www.readbyqxmd.com/read/28861607/glomerular-and-tubular-effects-of-nitric-oxide-no-are-regulated-by-angiotensin-ii-ang-ii-in-an-age-dependent-manner-through-activation-of-both-angiotensin-receptors-at1rs-and-at2rs-in-conscious-lambs
#3
Angela E Vinturache, Francine G Smith
Renin-angiotensin (RAS) and nitric oxide (NO) systems and the balance and interaction between them are considered of primary importance in maintaining fluid and electrolyte homeostasis. It has been suggested that the effects of NO may be modulated at least in part by the angiotensin (Ang) II, yet the roles of angiotensin receptor type 1 (AT1R) and type 2 (AT2R) are not well understood. Even though both Ang II and NO are elevated at birth and during the newborn period, their contribution to the adaptation of the newborn to life after birth as well as their physiological roles during development are poorly understood...
August 31, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/28833775/glucagon-like-peptide-1-cleavage-product-glp-1-9-36-amide-enhances-hippocampal-long-term-synaptic-plasticity-in-correlation-with-suppression-of-kv4-2-expression-and-eef2-phosphorylation
#4
Stephen M Day, Wenzhong Yang, Sarah Ewin, Xueyan Zhou, Tao Ma
Glucagon-like peptide-1 (GLP-1) is an endogenous gut hormone and a key regulator in maintaining glucose homeostasis by stimulating insulin secretion. Its natural cleavage product GLP-1 (9-36), used to be considered a "bio-inactive" metabolite mainly due to its lack of insulinotropic effects and low affinity for GLP-1 receptors, possesses unique properties such as anti-oxidant and cardiovascular protection. Little is known about the role of GLP-1 (9-36) in central nervous system. Here we report that chronic, systemic application of GLP-1 (9-36) in adult mice facilitated both the induction and maintenance phases of hippocampal Long-term potentiation (LTP), a major form of synaptic plasticity...
August 18, 2017: Hippocampus
https://www.readbyqxmd.com/read/28822066/do-evolutionary-changes-in-astrocytes-contribute-to-the-computational-power-of-the-hominid-brain
#5
Nancy Ann Oberheim Bush, Maiken Nedergaard
It is now well accepted that astrocytes are essential in all major nervous system functions of the rodent brain, including neurotransmission, energy metabolism, modulation of blood flow, ion and water homeostasis, and, indeed, higher cognitive functions, although the contribution of astrocytes in cognition is still in early stages of study. Here we review the most current research findings on human astrocytes, including their structure, molecular characterization, and functional properties. We also highlight novel tools that have been established for translational approaches to the comparative study of astrocytes from humans and experimental animals...
August 19, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28821771/thermal-acclimation-mitigates-cold-induced-paracellular-leak-from-the-drosophila-gut
#6
Heath A MacMillan, Gil Y Yerushalmi, Sima Jonusaite, Scott P Kelly, Andrew Donini
Chill susceptible insects suffer tissue damage and die at low temperatures. The mechanisms that cause chilling injury are not well understood but a growing body of evidence suggests that a cold-induced loss of ion and water homeostasis leads to hemolymph hyperkalemia that depolarizes cells, leading to cell death. The apparent root of this cascade is the net leak of osmolytes down their concentration gradients in the cold. Many insects, however, are capable of adjusting their thermal physiology, and cold-acclimated Drosophila can maintain homeostasis and avoid injury better than warm-acclimated flies...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28802667/different-approaches-to-modeling-analysis-of-mitochondrial-swelling
#7
REVIEW
Sabzali Javadov, Xavier Chapa-Dubocq, Vladimir Makarov
Mitochondria are critical players involved in both cell life and death through multiple pathways. Structural integrity, metabolism and function of mitochondria are regulated by matrix volume due to physiological changes of ion homeostasis in cellular cytoplasm and mitochondria. Ca(2+) and K(+) presumably play a critical role in physiological and pathological swelling of mitochondria when increased uptake (influx)/decreased release (efflux) of these ions enhances osmotic pressure accompanied by high water accumulation in the matrix...
August 10, 2017: Mitochondrion
https://www.readbyqxmd.com/read/28797976/physiological-mechanisms-of-water-and-electrolyte-disturbances-following-transsphenoidal-pituitary-surgery
#8
Evan T Blair, John S Clemmer, H Louis Harkey, Robert L Hester, W Andrew Pruett
BACKGROUND: Disturbances in water and electrolyte homeostasis are common following transsphenoidal surgery. These disorders are variable and unpredictable, increasing patient risk and complicating postsurgical treatment. Clinically, it is generally accepted that damage to the pituitary is the etiology, but the mechanisms behind the response variability and underlying pathophysiology remains unknown. OBJECTIVE: To test the hypothesis that changing the degree of damage to the pituitary stalk produces a spectrum of water and electrolyte disturbance along which all presentations of postsurgical water and electrolyte disturbances can be identified...
August 7, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28797479/paralysis-and-heart-failure-precede-ion-balance-disruption-in-heat-stressed-european-green-crabs
#9
Lisa B Jørgensen, Johannes Overgaard, Heath A MacMillan
Acute exposure of ectotherms to critically high temperatures causes injury and death, and this mortality has been associated with a number of physiological perturbations including impaired oxygen transport, loss of ion and water homeostasis, and neuronal failure. It is difficult to discern which of these factors, if any, is the proximate cause of heat injury because, for example, loss of ion homeostasis can impair neuromuscular function (including cardiac function), and conversely impaired oxygen transport reduces ATP supply and can thus reduce ion transport capacity...
August 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/28791033/sink-status-and-photosynthetic-rate-of-the-leaflet-galls-induced-by-bystracoccus-mataybae-eriococcidae-on-matayba-guianensis-sapindaceae
#10
Denis C Oliveira, Ana Silvia F P Moreira, Rosy M S Isaias, Vitor Martini, Uiara C Rezende
The galling insect Bystracoccus mataybae (Eriococcidae) induces green and intralaminar galls on leaflets of Matayba guianensis (Sapindaceae), and promotes a high oxidative stress in host plant tissues. This biotic stress is assumed by the histochemical detection of hydrogen peroxide, a reactive oxygen species (ROS), whose production alters gall physiology. Thus, we hypothesize that high levels of nutrients are accumulated during gall development in response to a local maintenance of photosynthesis and to the galling insect activity...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28769947/heterologous-expression-of-panax-ginseng-pgtip1-confers-enhanced-salt-tolerance-of-soybean-cotyledon-hairy-roots-composite-and-whole-plants
#11
Jing An, Zhenmin Hu, Benning Che, Haiying Chen, Bingjun Yu, Weiming Cai
The Panax ginseng TIP gene PgTIP1 was previously demonstrated to have high water channel activity by its heterologous expression in Xenopus laevis oocytes and in yeast; it also plays a significant role in growth of PgTIP1-transgenic Arabidopsis plants under favorable conditions and has enhanced tolerance toward salt and drought treatment. In this work, we first investigated the physiological effects of heterologous PgTIP1 expression in soybean cotyledon hairy roots or composite plants mediated by Agrobacterium rhizogenes toward enhanced salt tolerance...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28759749/effects-of-long-term-oral-administration-of-methimazole-on-femur-and-tibia-properties-in-male-wistar-rats
#12
Marcin R Tatara, Marcin Gołyński, Radosław P Radzki, Marek Bieńko, Witold Krupski
Physiological concentrations of thyroid hormones are crucial for skeletal growth and development, physiological bone turnover and bone homeostasis maintenance. Methimazole (1-methyl-2-mercaptoimidazole) is an antithyroid drug used for the treatment of the hyperthyroidism in humans and animals. The aim of the study was to determine effects of long-term oral methimazole treatment in male Wistar rats on biochemical bone metabolism markers, as well as morphological, geometric, densitometric and mechanical properties of femur and tibia...
July 28, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28758594/effects-of-resveratrol-and-ace-inhibitor-enalapril-on-glucose-and-lipid-profiles-in-mice
#13
Thaisa de Almeida Pinheiro, Thales de Almeida Pinheiro, Jonh David Feltenberger, João Marcus Oliveira Andrade, Emillio César Ferreira, Deborah De Farias Lelis, Andre Luiz Sena Guimarães, Alfredo Maurício Batista de Paula, Antônio Prates Caldeira, Sérgio Henrique Sousa Santos
Lipogenesis is a process that involves the synthesis of fatty acids. Resveratrol and enalapril are being studied for their beneficial physiological properties on the glucose and lipid metabolism. The aim of the present study was to evaluate the oral administration of resveratrol and enalapril on the glucose and lipid metabolism, evaluating the white pad lipogenesis genes expression in mice. Swiss male mice were divided into four groups and treated for eight weeks as follows: Standard diet ad libitum (G1); Standard diet + Resveratrol (G2); Standard diet + Enalapril (G3); Standard diet + Resveratrol + Enalapril (G4), where resveratrol was administered with the food and enalapril with the water...
July 28, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28751902/overexpression-of-sbsi-1-a-nuclear-protein-from-salicornia-brachiata-confers-drought-and-salt-stress-tolerance-and-maintains-photosynthetic-efficiency-in-transgenic-tobacco
#14
Jyoti Kumari, Pushpika Udawat, Ashish K Dubey, Md Intesaful Haque, Mangal S Rathore, Bhavanath Jha
A novel Salicornia brachiata Salt Inducible (SbSI-1) gene was isolated and overexpressed in tobacco for in planta functional validation subjected to drought and salt stress. SbSI-1 is a nuclear protein. The transgenic tobacco overexpressing SbSI-1 gene exhibited better seed germination, growth performances, pigment contents, cell viability, starch accumulation, and tolerance index under drought and salt stress. Overexpression of SbSI-1 gene alleviated the build-up of reactive oxygen species (ROS) and curtailed the ROS-induced oxidative damages thus improved the physiological health of transgenic tobacco under stressed conditions...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28748132/effects-of-intake-of-lactobacillus-casei-subsp-casei-327-on-skin-conditions-a-randomized-double-blind-placebo-controlled-parallel-group-study-in-women
#15
Yuhi Saito, Toshihiro Mihara, Kentaro Maruyama, Jiro Saito, Masumi Ikeda, Akihito Tomonaga, Takehisa Kumagai
Lactic acid bacteria are gut flora that play key roles in intestinal homeostasis, which may affect a variety of physiological functions. Our preliminary double-blind, placebo-controlled, parallel-group trials have suggested that intake of heat-killed Lactobacillus casei subsp. casei 327 (designated L. K-1) is effective for improving skin conditions. The aim of this study was to confirm the effect of L. K-1 intake in a randomized, double-blind, placebo-controlled, parallel-group study in healthy female volunteers...
2017: Bioscience of Microbiota, Food and Health
https://www.readbyqxmd.com/read/28747920/unraveling-key-metabolomic-alterations-in-wheat-embryos-derived-from-freshly-harvested-and-water-imbibed-seeds-of-two-wheat-cultivars-with-contrasting-dormancy-status
#16
Aayudh Das, Dea-Wook Kim, Pramod Khadka, Randeep Rakwal, Jai S Rohila
Untimely rains in wheat fields during harvest season can cause pre-harvest sprouting (PHS), which deteriorates the yield and quality of wheat crop. Metabolic homeostasis of the embryo plays a role in seed dormancy, determining the status of the maturing grains either as dormant (PHS-tolerant) or non-dormant (PHS-susceptible). Very little is known for direct measurements of global metabolites in embryonic tissues of dormant and non-dormant wheat seeds. In this study, physiologically matured and freshly harvested wheat seeds of PHS-tolerant (cv...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28733328/thermal-imprinting-modifies-bone-homeostasis-in-cold-challenged-sea-bream-sparus-aurata-l
#17
Ana Patrícia Mateus, Rita Costa, Enric Gisbert, Patricia I S Pinto, Karl B Andree, Alicia Estévez, Deborah M Power
Fish are ectotherms and temperature plays a determinant role in their physiology, biology and ecology and is a driver of seasonal responses. The present study assessed how thermal imprinting during embryonic and larval stages modified the response of adult fish to low water temperature. We targeted the gilthead sea bream that develops a condition known as winter syndrome when it is exposed to low water temperatures. Eggs and larvae of sea bream were exposed to four different thermal regimes and then the response of the resulting adults to a low temperature challenge was assessed...
July 21, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28714415/aquaporin-4-in-astrocytes-is-a-target-for-therapy-in-alzheimer-s-disease
#18
Yu-Long Lan, Jian-Jiao Chen, Gang Hu, Jun Xu, Ming Xiao, Shao Li
Current experimental evidence points to the conclusion that aquaporin 4 (AQP4), which is an important water-channel membrane protein found in the brain, could play major roles in various brain conditions pathologically including pathogenesis of Alzheimer's disease (AD). In this paper, we review how AQP4 and altered astrocyte functions interact in AD, and provide experimental evidence highlighting the importance of this topic for the future investigations. The interactions of AQP4 are as follows: (i) AQP4 could influence astrocytic calcium signaling and potassium homeostasis...
July 14, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28714397/prognostic-value-of-copeptin-in-chronic-kidney-disease-from-general-population-to-end-stage-renal-disease
#19
Edyta Golembiewska, Anna Machowska, Peter Stenvinkel, Bengt Lindholm
Arginine vasopressin (AVP), also known as antidiuretic hormone (ADH), is released in response to osmotic and non-osmotic stimuli and plays a key role in many physiologic and pathologic processes. The main function of AVP is the control of fluid homeostasis by inducing water conservation by the kidney, but it also stimulates arteriolar vasoconstriction and the release of adrenocorticotropic hormone (ACTH). These actions are mediated by different AVP receptors located on various target cells. Produced in hypothalamus from a larger precursor, pre-proAVP, AVP is produced in equimolar amounts to copeptin, a glycopeptide with yet unknown biologic function...
July 14, 2017: Current Protein & Peptide Science
https://www.readbyqxmd.com/read/28706505/cell-cell-interaction-proteins-gap-junctions-tight-junctions-and-desmosomes-and-water-transporter-aquaporin-4-in-meningothelial-cells-of-the-human-optic-nerve
#20
Thi Ngoc Co Zeleny, Corina Kohler, Albert Neutzner, Hanspeter E Killer, Peter Meyer
PURPOSE: Meningothelial cells (MECs) play a central role in the maintenance of cerebrospinal fluid (CSF) homeostasis and in physiological and pathophysiological processes within the subarachnoid space (SAS) linking them to optic nerve (ON) pathologies. Still, not much is known about their structural properties that might enable MECs to perform specific functions within the ON microenvironment. METHODS: For closer characterization of the structural properties of the human MEC layer in the arachnoid, we performed immunohistological analyses to evaluate the presence of cell-cell interaction markers, namely, markers for tight junctions (JAM1, Occludin, and Claudin 5), gap junctions (Connexin 26 and 43), and desmosomes (Desmoplakin) as well as for water channel marker aquaporin 4 (AQP4) in retrobulbar, midorbital, and intracanalicular human ON sections...
2017: Frontiers in Neurology
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