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https://www.readbyqxmd.com/read/27891097/molecular-characterization-of-aquaporin-1-and-aquaporin-3-from-the-gills-of-the-african-lungfish-protopterus-annectens-and-changes-in-their-branchial-mrna-expression-levels-and-protein-abundance-during-three-phases-of-aestivation
#1
You R Chng, Jasmine L Y Ong, Biyun Ching, Xiu L Chen, Kum C Hiong, Wai P Wong, Shit F Chew, Siew H Lam, Yuen K Ip
African lungfishes can undergo long periods of aestivation on land during drought. During aestivation, lungfishes are confronted with desiccation and dehydration, and their gills become non-functional and covered with a thick layer of dried mucus. Aquaporins (Aqps) are a superfamily of integral membrane proteins which generally facilitate the permeation of water through plasma membranes. This study aimed to obtain the complete cDNA coding sequences of aqp1 and aqp3 from the gills of Protopterus annectens, and to determine their branchial mRNA and protein expression levels during the induction, maintenance and arousal phases of aestivation...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27806730/comparative-physiological-plasticity-to-desiccation-in-distinct-populations-of-the-malarial-mosquito-anopheles-coluzzii
#2
K Hidalgo, D Siaussat, V Braman, K R Dabiré, F Simard, K Mouline, D Renault
BACKGROUND: In West Africa, populations of the malaria vector mosquito, Anopheles coluzzii, are seasonally exposed to strong desiccating conditions during the dry season. Their dynamics strictly follows the pace of the availability of suitable larval development sites (water collections). Accordingly, mosquitoes can reproduce all year long where permanent breeding is possible, or stop reproduction and virtually disappear at the onset of the dry season when surface water dries up, like observed in temporary habitats of dry savannah areas...
November 2, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27601256/gene-structure-expression-and-dna-methylation-characteristics-of-sea-cucumber-cyclin-b-gene-during-aestivation
#3
Aijun Zhu, Muyan Chen, Xiumei Zhang, Kenneth B Storey
The sea cucumber, Apostichopus japonicus, is a good model for studying environmentally-induced aestivation by a marine invertebrate. One of the central requirements of aestivation is the repression of energy-expensive cellular processes such as cell cycle progression. The present study identified the gene structure of the cell cycle regulator, cyclin B, and detected the expression levels of this gene over three stages of the annual aestivation-arousal cycle. Furthermore, the DNA methylation characteristics of cyclin B were analyzed in non-aestivation and deep-aestivation stages of sea cucumbers...
December 5, 2016: Gene
https://www.readbyqxmd.com/read/27591287/eliminating-macchiademus-diplopterus-hemiptera-lygaeidae-and-siculobata-sicula-acari-oribatulidae-from-export-fruit-using-ethyl-formate
#4
Tim G Grout, Kim C Stoltz
South African fruit is sometimes rejected for export for the presence of live arthropods that are not considered pests of the fruit concerned. Macchiademus diplopterus (Distant) (Hemiptera: Lygaeidae) is a cereal pest but may aestivate on fruit of some tree crops in the Western Cape province of South Africa and occasionally results in rejections of export fruit. Ethyl formate in the form of the commercial product Vapormate (a patented combination of ethyl formate and carbon dioxide) was evaluated as a fumigant against M...
September 2, 2016: Journal of Economic Entomology
https://www.readbyqxmd.com/read/27582559/prevention-of-muscle-wasting-and-osteoporosis-the-value-of-examining-novel-animal-models
#5
REVIEW
Beau D Reilly, Craig E Franklin
Bone mass and skeletal muscle mass are controlled by factors such as genetics, diet and nutrition, growth factors and mechanical stimuli. Whereas increased mechanical loading of the musculoskeletal system stimulates an increase in the mass and strength of skeletal muscle and bone, reduced mechanical loading and disuse rapidly promote a decrease in musculoskeletal mass, strength and ultimately performance (i.e. muscle atrophy and osteoporosis). In stark contrast to artificially immobilised laboratory mammals, animals that experience natural, prolonged bouts of disuse and reduced mechanical loading, such as hibernating mammals and aestivating frogs, consistently exhibit limited or no change in musculoskeletal performance...
September 1, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27581948/aestivation-and-brain-of-the-african-lungfish-protopterus-annectens
#6
COMMENT
Shit F Chew, Kum Hiong
Scientists have long been fascinated by animals undergoing aestivation, a state of torpor at high temperature, due to its great potential in fields ranging from medicine to space travel. The brain of the African lungfish is able to coordinate a whole-body response to induce aestivation and to arouse from aestivation.
July 2014: Temperature: Multidisciplinary Biomedical Journal
https://www.readbyqxmd.com/read/27568195/effects-of-seasonal-variation-on-oxidative-stress-physiology-in-natural-population-of-toad-bufo-melanostictus-clues-for-analysis-of-environmental-pollution
#7
Luna Samanta, Biswaranjan Paital
Natural population of Bufo melanostictus in response to environmental cues shows several physiologic changes such as reproductive activity, hibernation, aestivation and metabolic depression in different seasons. We investigated the effects of seasonal fluctuations on oxidative stress (OS) physiology biomarkers, such as endogenous (ELPx) and induced (ILPx) lipid peroxidation, front-line redox regulatory enzymes (superoxide dismutase: SOD and catalase) and two non-enzyme antioxidant metabolites (ascorbic acid and reduced glutathione) in liver, gonad and cerebral hemisphere of toads collected from the Bhubaneswar area of India, where temperature fluctuates considerably rising to the highest in summer (∼46 °C) and being lowest in winter (<10 °C)...
August 27, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27394476/descriptions-of-little-known-and-unknown-morphs-of-periphyllus-acerihabitans-zhang-hemiptera-aphididae-chaitophorinae
#8
Karina Wieczorek, Ge-Xia Qiao, Masakazu Sano, Hiroyuki Yoshitomi, Mariusz Kanturski
Periphyllus acerihabitans Zhang, 1982, associated with Acer buergerianum, is known only from the original description from China. Based on the type series and specimens collected in Japan, we re-describe apterous and alate viviparous females of P. acerihabitans and describe dimorph (aestivating nymph) and oviparous female in detail with illustrations. This is the first record of this species from Japan. The differences between P. acerihabitans and a related species P. viridis (Matsumura, 1919) are discussed...
2016: Zootaxa
https://www.readbyqxmd.com/read/27376927/understanding-mechanism-of-sea-cucumber-apostichopus-japonicus-aestivation-insights-from-tmt-based-proteomic-study
#9
Muyan Chen, Xingke Li, Aijun Zhu, Kenneth B Storey, Lina Sun, Tianxiang Gao, Tianming Wang
Marine invertebrate aestivation is a unique strategy for summer survival in response to hot marine conditions. The sea cucumber, Apostichopus japonicus, is an excellent model marine invertebrate for studies of environmentally-induced aestivation. In the present study, we used a tandem mass tag (TMT)-coupled LC-MS/MS approach to identify and quantify the global proteome expression profile over the aestivation-arousal cycle of A. japonicus. A total of 3920 proteins were identified from the intestine of sea cucumber...
September 2016: Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics
https://www.readbyqxmd.com/read/27318654/global-metabolite-analysis-of-the-land-snail-theba-pisana-hemolymph-during-active-and-aestivated-states
#10
U Bose, E Centurion, M P Hodson, P N Shaw, K B Storey, S F Cummins
The state of metabolic dormancy has fascinated people for hundreds of years, leading to research exploring the identity of natural molecular components that may induce and maintain this state. Many animals lower their metabolism in response to high temperatures and/or arid conditions, a phenomenon called aestivation. The biological significance for this is clear; by strongly suppressing metabolic rate to low levels, animals minimize their exposure to stressful conditions. Understanding blood or hemolymph metabolite changes that occur between active and aestivated animals can provide valuable insights relating to those molecular components that regulate hypometabolism in animals, and how they afford adaptation to their different environmental conditions...
September 2016: Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics
https://www.readbyqxmd.com/read/27257549/ecological-implications-of-metabolic-compensation-at-low-temperatures-in-salamanders
#11
Alessandro Catenazzi
Global warming is influencing the biology of the world's biota. Temperature increases are occurring at a faster pace than that experienced by organisms in their evolutionary histories, limiting the organisms' response to new conditions. Mechanistic models that include physiological traits can help predict species' responses to warming. Changes in metabolism at high temperatures are often examined; yet many species are behaviorally shielded from high temperatures. Salamanders generally favor cold temperatures and are one of few groups of metazoans to be most species-rich in temperate regions...
2016: PeerJ
https://www.readbyqxmd.com/read/27127682/an-overview-of-seasonal-changes-in-oxidative-stress-and-antioxidant-defence-parameters-in-some-invertebrate-and-vertebrate-species
#12
REVIEW
Gagan Bihari Nityananda Chainy, Biswaranjan Paital, Jagneswar Dandapat
Antioxidant defence system, a highly conserved biochemical mechanism, protects organisms from harmful effects of reactive oxygen species (ROS), a by-product of metabolism. Both invertebrates and vertebrates are unable to modify environmental physical factors such as photoperiod, temperature, salinity, humidity, oxygen content, and food availability as per their requirement. Therefore, they have evolved mechanisms to modulate their metabolic pathways to cope their physiology with changing environmental challenges for survival...
2016: Scientifica
https://www.readbyqxmd.com/read/26808964/breeding-under-unpredictable-conditions-annual-variation-in-gonadal-maturation-energetic-reserves-and-plasma-levels-of-androgens-and-corticosterone-in-anurans-from-the-brazilian-semi-arid
#13
Carla Bonetti Madelaire, Fernando Ribeiro Gomes
Anurans living in arid and semi-arid habitats are subjected to unpredictable rain patterns. Consequently, they should be prepared to reproduce at the onset of rain events. We investigated the covariation between calling behavior, testicular maturation, abdominal fat body index (FBI), plasma levels of androgens (T-DHT) and corticosterone (CORT) of males from three species of anurans in the Brazilian semi-arid during the reproductive period and drought. One of these species aestivates during the drought, while the other two species remain foraging...
March 1, 2016: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/26797504/post-translational-regulation-of-hexokinase-function-and-protein-stability-in-the-aestivating-frog-xenopus-laevis
#14
Christine L Childers, Kenneth B Storey
Xenopus laevis endure substantial dehydration which can impose hypoxic stress due to impaired blood flow. Tissues may increase reliance on anaerobic glycolysis for energy production making the regulation of hexokinase (HK) important. We investigated the enzymatic properties and phosphorylation state of purified HK from the muscle of control and dehydrated (30% total body water lost) frogs. Bioinformatic tools were also applied to analyze the structural implication of HK phosphorylation in silico. HK from the muscle of dehydrated frogs showed a significantly higher Vmax (3...
February 2016: Protein Journal
https://www.readbyqxmd.com/read/26576935/monitoring-dry-season-persistence-of-anopheles-gambiae-s-l-populations-in-a-contained-semi-field-system-in-southwestern-burkina-faso-west-africa
#15
W Mamai, F Simard, D Couret, G A Ouedraogo, D Renault, K R Dabiré, K Mouline
To gain insight into the dry season survival strategies of Anopheles gambiae s.l., a new contained semi-field system was developed and used for the first time in Burkina Faso, West Africa. The system consisted of a screened greenhouse within which the local environment was reproduced, including all ecological requirements for mosquito development cycle completion. The system was seeded with the progenies of female Anopheles gambiae, Anopheles coluzzii, and Anopheles arabiensis collected in the vicinity of the greenhouse during the rainy season...
January 2016: Journal of Medical Entomology
https://www.readbyqxmd.com/read/26497253/genes-and-associated-peptides-involved-with-aestivation-in-a-land-snail
#16
K J Adamson, T Wang, B Rotgans, T Kruangkum, A V Kuballa, K B Storey, S F Cummins
Some animals can undergo a remarkable transition from active normal life to a dormant state called aestivation; entry into this hypometabolic state ensures that life continues even during long periods of environmental hardship. In this study, we aimed to identify those central nervous system (CNS) peptides that may regulate metabolic suppression leading to aestivation in land snails. Mass spectral-based neuropeptidome analysis of the CNS comparing active and aestivating states, revealed 19 differentially produced peptides; 2 were upregulated in active animals and 17 were upregulated in aestivated animals...
October 20, 2015: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/26449974/aestivation-induces-changes-in-transcription-and-translation-of-coagulation-factor-ii-and-fibrinogen-gamma-chain-in-the-liver-of-the-african-lungfish-protopterus-annectens
#17
Kum C Hiong, Xiang R Tan, Mel V Boo, Wai P Wong, Shit F Chew, Yuen K Ip
This study aimed to sequence and characterize two pro-coagulant genes, coagulation factor II (f2) and fibrinogen gamma chain (fgg), from the liver of the African lungfish Protopterus annectens, and to determine their hepatic mRNA expression levels during three phases of aestivation. The protein abundance of F2 and Fgg in the liver and plasma was determined by immunoblotting. The results indicated that F2 and Fgg of P. annectens were phylogenetically closer to those of amphibians than those of teleosts. Three days of aestivation resulted in an up-regulation in the hepatic fgg mRNA expression level, while 6 days of aestivation led to a significant increase (3-fold) in the protein abundance of Fgg in the plasma...
December 2015: Journal of Experimental Biology
https://www.readbyqxmd.com/read/26385000/comparative-phosphoproteomic-analysis-of-intestinal-phosphorylated-proteins-in-active-versus-aestivating-sea-cucumbers
#18
COMPARATIVE STUDY
Muyan Chen, Aijun Zhu, Kenneth B Storey
UNLABELLED: The sea cucumber Apostichopus japonicus is becoming an excellent model marine invertebrate for studies of environmentally-induced aestivation. Reversible protein phosphorylation as a regulatory mechanism in aestivation is known for some terrestrial aestivators but has never before been documented in sea cucumbers. The present study provides a global quantitative analysis of the role of reversible phosphorylation in sea cucumber aestivation by using tandem mass tag (TMT) labeling followed by an IMAC enrichment strategy to map aestivation-responsive changes in the phosphoproteome of sea cucumber intestine...
March 1, 2016: Journal of Proteomics
https://www.readbyqxmd.com/read/26349227/-morphological-changes-in-the-structure-of-blastozones-during-fasciation-of-pisum-sativum-l-and-arabidopsis-thaliana-l-heynh
#19
E A Bykova, E A Labunskaya, V V Chub
Different effects of fasciation on the structure of blastozones and ultimately on the morphology of the plants of the two families investigated was detected. The results of this study demonstrate that in Arabidopsis thaliana phyllotaxis changes, leading to the formation of whorled leaf aestivation (two or four leaf in the whorl). We also demonstrated that in Pisum sativum the number of folioles of a compound leaf increased, the number of stipules also increased, and stipules can grow together and form a structure similar to the sheath of Gramineae...
May 2015: Izvestiia Akademii Nauk. Seriia Biologicheskaia
https://www.readbyqxmd.com/read/26335041/snails-in-the-desert-assessing-the-mitochondrial-and-morphological-diversity-and-the-influence-of-aestivation-behavior-on-lineage-differentiation-in-the-australian-endemic-granulomelon-iredale-1933-stylommatophora-camaenidae
#20
Francesco Criscione, Frank Köhler
Progressive aridification since the mid-Miocene has had a significant influence on the evolution of the biota in the arid zone of central Australia. Especially moisture sensitive groups, such as snails, are often restricted to topographically complex areas, which have acted as refugia in an otherwise inhospitable environment. This historical fragmentation is deemed to be a potent agent of allopatric lineage diversification. Camaenid land snails are amongst only a few terrestrial gastropods that have managed to survive in the arid zone probably due to their ability to escape desiccation through aestivation...
January 2016: Molecular Phylogenetics and Evolution
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