共查询到20条相似文献,搜索用时 0 毫秒
1.
Members of the HSP70 gene family comprising the inducible (HSP70) genes and GRP78 (glucose-regulated protein 78 kDa) were
identified in an Antarctic sea star (Odontaster validus) and an Antarctic gammarid (Paraceradocus gibber). These genes were surveyed for expression levels via Q-PCR after an acute 2-hour heat shock experiment in both animals and
a time course assay in O. validus. No significant up-regulation was detected for any of the genes in either of the animals during the acute heat shock. The
time course experiment in O. validus produced slightly different results with an initial down regulation in these genes at 2°C, but no significant up-regulation
of the genes either at 2 or 6°C. Therefore, the classical heat shock response is absent in both species. The data is discussed
in the context of the organisms’ thermal tolerance and the applicability of HSP70 to monitor thermal stress in Antarctic marine
organisms. 相似文献
2.
Bishop JD Manríquez PH Hughes RN 《Proceedings. Biological sciences / The Royal Society》2000,267(1449):1165-1169
A diverse array of sessile marine invertebrates mate by passive dispersal of sperm which fertilize the brooded eggs of neighbours. In two such species, a sea-mat (phylum Bryozoa) and an ascidian (phylum Chordata), vitellogenic egg growth is absent in reproductively isolated specimens, but is triggered by a water-borne factor released by conspecifics. In both of these colonial, hermaphroditic species, the active factor can be removed from water by filtration. The effect involves self-/non-self-recognition: water conditioned by a separate subcolony of the same genetic individual does not prompt oocyte growth. In each species, allosperm move from the surrounding water to the ovary and are then stored in close association with the growing oocytes. We concluded that sperm themselves are the water-borne factor that triggers the major phase of female reproductive investment. This mechanism is, to our knowledge, previously undescribed in animals, but has parallels with the initiation of maternal investment in flowering plants following the receipt of compatible pollen. The species studied may be representative of many other aquatic invertebrates which mate in a similar way. The stimulation of egg growth by allosperm could lead to intersexual conflict during oogenesis. 相似文献
3.
The third way: spermcast mating in sessile marine invertebrates 总被引:2,自引:0,他引:2
Marine invertebrates belonging to a broad range of taxa disperseaquatic spermatozoa to fertilize eggs that are retained ratherthan spawned. We outline the occurrence of this mechanism, whichwe refer to as spermcast mating, and identify tentative generalizationsrelating to it. Contrasts are drawn where appropriate with broadcastspawning of both eggs and sperm for external fertilization,and with copulation or pseudocopulation. Spermcast mating mayinvolve the gradual accumulation of long-lived spermatozoa fromdilute suspension, probably during suspension feeding, and thesubsequent storage of spermatozoa by the recipient (acting female)prior to fertilization. This process may involve extensive contactbetween spermatozoa and recipient (maternal) tissue. Matingmay be influenced by compatibility systems, and receipt of compatibleallosperm may trigger female investment, giving apparent scopefor sexual conflict over levels of maternal investment. Externalfertilization of cohesive egg masses remaining close to theacting female may appear somewhat intermediate between spermcastmating and broadcast spawning but, while it may be possibleto envisage a continuum between the 2 modes, the end pointsare distinct, commonplace, and involve contrasting reproductivecharacteristics. Three variants of the typical pattern of spermcastmating are briefly discussed: the spawning of zygotes (ratherthan the more usual brooding of progeny), polyembryony, andthe dispersal of spermatophores rather than individual spermatozoa. 相似文献
4.
T N Zvyagintseva L A Elyakova V B Krasohin 《Comparative biochemistry and physiology. B, Comparative biochemistry》1992,102(1):187-191
1. The search for inhibitors and activators of endo-1----3-(EC 3.2.1.6) and 1----6-beta-D-glucanases (EC3.2.1) from marine mollusks in aqueous and ethanol extracts of various types of marine invertebrates, such as sponges, ascidians, coelenterates, echinoderms, dwelling in north seas (the sea of Okhotsk and the sea of Japan) and torrid seas (western coast of Australia) has been made. 2. A comparative analysis has shown that the overwhelming majority of extracts of animals, dwelling near Australia, inhibit beta-D-glucanases. 3. On the contrary, the extracts of animals dwelling in the sea of Okhotsk possess the activating effect, except for sponges of genera Haliclona whose sample extracts display a significant activating effect independently of their place of abode. 相似文献
5.
Pacific oysters, Crassostrea gigas, living at a range of tidal heights, routinely encounter large seasonal fluctuations in temperature. We demonstrate that the thermal limits of oysters are relatively plastic, and that these limits are correlated with changes in the expression of one family of heat-shock proteins (HSP70). Oysters were cultured in the intertidal zone, at two tidal heights, and monitored for changes in expression of cognate (HSC) and inducible (HSP) heat-shock proteins during the progression from spring through winter. We found that the "control" levels (i.e., prior to laboratory heat shock) of HSC77 and HSC72 are positively correlated with increases in ambient temperature and were significantly higher in August than in January. The elevated level of HSCs during the summer was associated with moderate, 2-3 degrees C, increases in the upper thermal limits for survival. We measured concomitant increases in the threshold temperatures (T(on)) required for induction of HSP70. Total hsp70 mRNA expression reflected the seasonal changes in the expression of inducible but not cognate members of the HSP70 family of proteins. A potential cost of increased T(on) in the summer is that there was no extension of the upper thermal limits for survival (i.e., induction of thermotolerance) after sublethal heat shock at temperatures that were sufficient to induce thermotolerance during the winter months. 相似文献
6.
7.
The ability to understand and predict the effects of environmental stress on biodiversity is becoming increasingly important in our changing environment. Antarctic marine species are some of the most stenothermal on the planet and many inhabit the waters off the Antarctic Peninsula which is one of the areas where there is rapid regional climate change. Therefore these animals are highly vulnerable to changing environmental temperatures and clearly we need to understand the complexities of their response, not just at the individual species level, but also the implications for the ecosystem as a whole. Heat shock proteins have a long history of use in studies of organism stress responses and have frequently been proposed as potential universal molecular biomarkers, especially for non-model species. In this mini-review, the heat shock response and heat shock proteins (specifically the HSP70 family) are examined in Antarctic marine species alongside their physiological capabilities and limits to answer a series of questions: do these animals have a heat shock response which includes the expression of HSP70 genes? What is the relationship between their heat shock response and physiological capabilities? Can HSP70 genes be used as molecular biomarkers for these species? 相似文献
8.
Cloning of the HSP70 gene from Halobacterium marismortui: relatedness of archaebacterial HSP70 to its eubacterial homologs and a model for the evolution of the HSP70 gene. 总被引:4,自引:0,他引:4
下载免费PDF全文

Heat shock induces the synthesis of a set of proteins in Halobacterium marismortui whose molecular sizes correspond to the known major heat shock proteins. By using the polymerase chain reaction and degenerate oligonucleotide primers for conserved regions of the 70-kDa heat shock protein (HSP70) family, we have successfully cloned and sequenced a gene fragment containing the entire coding sequence for HSP70 from H. marismortui. HSP70 from H. marismortui shows between 44 and 47% amino acid identity with various eukaryotic HSP70s and between 51 and 58% identity with its eubacterial and archaebacterial homologs. On the basis of a comparison of all available HSP70 sequences, we have identified a number of unique sequence signatures in this protein family that provide a clear distinction between eukaryotic organisms and prokaryotic organisms (archaebacteria and eubacteria). The archaebacterial (viz., H. marismortui and Methanosarcina mazei) HSP70s have been found to contain all of the signature sequences characteristic of eubacteria (particularly the gram-positive bacteria), which suggests a close evolutionary relationship between these groups. In addition, detailed analyses of HSP70 sequences that we have carried out have revealed a number of additional novel features of the HSP70 protein family. These include (i) the presence of an insertion of about 25 to 27 amino acids in the N-terminal quadrants of all known eukaryotic and prokaryotic HSP70s except those from archaebacteria and the gram-positive group of bacteria, (ii) significant sequence similarity in HSP70 regions comprising its first and second quadrants from organisms lacking the above insertion, (iii) highly significant similarity between a protein, MreB, of Escherichia coli and the N-terminal half of HSP70s, (iv) significant sequence similarity between the N-terminal quadrant of HSP70 (from gram-positive bacteria and archaebacteria) and the m-type thioredoxin of plant chloroplasts. To account for these and other observations, a model for the evolution of HSP70 proteins involving gene duplication is proposed. The model proposes that HSP70 from archaebacteria (H. marismortui and M. mazei) and the gram-positive group of bacteria constitutes the ancestral form of the protein and that all other HSP70s (viz., other eubacteria as well as eukaryotes) containing the insert have evolved from this ancient protein. 相似文献
9.
Jianhua Ming Jun Xie Pao Xu Wenbin Liu Xianping Ge Bo Liu Yijin He Yanfen Cheng Qunlan Zhou Liangkun Pan 《Fish & shellfish immunology》2010,28(3):407-418
Two complementary deoxyribonucleic acid (cDNA) clones encoding heat shock cognate 70 (HSC70) and inducible heat shock protein 70 (HSP70) were isolated from the liver of Wuchang bream (Megalobrama amblycephala Y.) using RT-PCR and rapid amplification of cDNA ends (RACE). They were named Ma-HSC70 and Ma-HSP70, respectively. The cDNAs were 2336 and 2224 bp in length [not including poly (A)] and contained 1950 and 1932 bp open reading frames (ORFs), respectively. The ORFs encoded proteins of 649 and 643 amino acids with predicted molecular weights of 71.24 and 70.52 kDa, and theoretical isoelectric points of 5.25 and 5.30, respectively. Genomic DNA structure analysis revealed that Ma-HSC70 gene contained seven introns with all introns conforming to the GT/AG rule whereas Ma-HSP70 gene did not contain any intron in the coding region. Amino acid sequence analysis indicated that both Ma-HSC70 and Ma-HSP70 contained three signature sequences of HSP70 family, two partial overlapping bipartite nuclear localization signal sequences (NLS) and cytoplasmic characteristic motif (EEVD). Homology analysis revealed that Ma-HSC70 shared more than 93.0% identity with the known HSC70s of other vertebrates, while Ma-HSP70 shared more than 85.0% identity with the known HSP70s of other vertebrates, and Ma-HSC70 and Ma-HSP70 shared 86.5% identity. Bioinformatics analysis indicated that the proteins encoded by Ma-HSC70 and Ma-HSP70 genes were hydrophilic, rich in B cells antigenic sites, without any signal peptide or transmembrane region. The two proteins also contained many protein kinase C phosphorylation sites, N-myristoylation sites, casein kinase II phosphorylation sites, and N-glycosylation sites, predicting that they could play essential roles in protein folding, translocation, intracellular localization, signal transduction and regulation. The predominant secondary structures of the two proteins were α-helix and random coil. Fluorescent real-time quantitative RT-PCR was used to study the effects of heat shock (34 °C), crowding stress (100 g L?1) and challenge with bacteria Aeromonas hydrophila on the mRNA expression of the two HSP70s in Wuchang bream liver. The results indicated that, during 24 h stress, Ma-HSC70 mRNA expression decreased at first and then rose to the level before stress under heat shock and crowding stress, but Ma-HSP70 mRNA expression increased at first and then decreased under heat stress, and appeared to increase continuously under crowding stress. After bacterial challenge, the mRNA levels of both Ma-HSC70 and Ma-HSP70 increased at first and then decreased. The cloning and expression analysis of the two HSP70s provide theoretical basis to further study the mechanism of anti-adverseness and expression characteristics under stress conditions of Wuchang bream. 相似文献
10.
HSP70 constitutive expression in rat central nervous system from postnatal development to maturity. 总被引:3,自引:0,他引:3
Guillermo Bodega Celia Hernández Isabel Suárez Montserrat Martín Benjamín Fernández 《The journal of histochemistry and cytochemistry》2002,50(9):1161-1168
We studied the level of the basal (constitutive) HSP70 expression (inducible and constitutive forms) in the central nervous system (CNS) of male and female rats from the postnatal period to maturity. HSP70 levels were analyzed by immunoblotting in five different areas (cortex, hippocampus, hypothalamus, cerebellum, and spinal cord). The highest levels of HSP70 were found in juvenile rats and decreased progressively until reaching baseline levels between 2 and 4 months. A slight and nonsignificant increase in aged (2-year-old) rats compared with adult subjects was observed in some cerebral areas (cerebral cortex, hippocampus, and cerebellum). In the first weeks of postnatal development, HSP70 immunoreactivity was distributed throughout CNS sections and no specific immunopositive cells could be clearly determined. In adult animals, strong immunostaining was observed in some large neurons (Purkinje neurons and mesencephalic and spinal cord motor neurons), some perivascular and subpial astrocytes, and ependymocytes. Immunoelectron microscopy revealed that HSP70 in these cells is located in the perinuclear area and in mitochondria, rough endoplasmic reticulum, and microtubules. In neurons, strong immunolabeling was also observed in synaptic membranes. The postnatal time course of HSP70 levels and the location and size of HSP70-immunopositive cells suggest that HSP70 constitutively expressed in the rat CNS may be mainly determined by the degree of development and metabolic activity of the neural cells. 相似文献
11.
Heneka MT Gavrilyuk V Landreth GE O'Banion MK Weinberg G Feinstein DL 《Journal of neurochemistry》2003,85(2):387-398
The inflammatory responses in many cell types are reduced by noradrenaline (NA) binding to beta-adrenergic receptors. We previously demonstrated that cortical inflammatory responses to aggregated amyloid beta (Abeta) are increased if NA levels were first depleted by lesioning locus ceruleus (LC) noradrenergic neurons, which replicates the loss of LC occurring in Alzheimer's disease. To examine the molecular basis for increased responses, we used the selective neurotoxin DSP4 to lesion the LC, and then examined levels of putative anti-inflammatory molecules. Inflammatory responses were achieved by injection of aggregated Abeta1-42 peptide and IL-1beta into frontal cortex, which induced neuronal inducible nitric oxide synthase (iNOS) and microglial IL-1beta expression. DSP4-treatment reduced basal levels of nuclear factor kappa B (NF-kappaB) inhibitory IkappaB proteins, and of heat shock protein (HSP)70. Inflammatory responses were prevented by co-injection (ibuprofen or ciglitzaone) or oral administration (pioglitazone) of peroxisome proliferator-activated receptor gamma (PPARgamma) agonists. Treatment with PPARgamma agonists restored IkappaBalpha, IkappaBbeta, and HSP70 levels to values equal or above those observed in control animals, and reduced activation of cortical NF-kappaB. These results suggest that noradrenergic depletion reduces levels of anti-inflammatory molecules which normally limit cortical responses to Abeta, and that PPARgamma agonists can reverse that effect. These findings suggest one mechanism by which PPARgamma agonists could provide benefit in neurological diseases having an inflammatory component. 相似文献
12.
13.
The goal of this study was to investigate whether radiofrequency (RF) electromagnetic-field (EMF) exposure at 1800 MHz causes production of free radicals and/or expression of heat-shock proteins (HSP70) in human immune-relevant cell systems. Human Mono Mac 6 and K562 cells were used to examine free radical release after exposure to incubator control, sham, RF EMFs, PMA, LPS, heat (40 degrees C) or co-exposure conditions. Several signals were used: continuous-wave, several typical modulations of the Global System for Mobile Communications (GSM): GSM-non DTX (speaking only), GSM-DTX (hearing only), GSM-Talk (34% speaking and 66% hearing) at specific absorption rates (SARs) of 0.5, 1.0, 1.5 and 2.0 W/kg. Heat and PMA treatment induced a significant increase in superoxide radical anions and in ROS production in the Mono Mac 6 cells when compared to sham and/or incubator conditions. No significant differences in free radical production were detected after RF EMF exposure or in the respective controls, and no additional effects on superoxide radical anion production were detected after co-exposure to RF EMFs+PMA or RF EMFs+LPS. The GSM-DTX signal at 2 W/kg produced a significant difference in free radical production when the data were compared to sham because of the decreasing sham value. This difference disappeared when data were compared to the incubator controls. To determine the involvement of heat-shock proteins as a possible inhibitor of free radical production, we investigated the HSP70 expression level after different RF EMF exposures; no significant effects were detected. 相似文献
14.
Neurons maintain an intricate organization of cytoplasmic and membrane proteins for their integrity, quick communication across synapses and for other complex activities. Molecular chaperones such as members of the 70 kDa heat shock protein (HSP70) family may play very important roles in these functions. However, in spite of a recent report suggesting the presence of HSP70 related proteins in the synaptic vesicle docking complex at presynaptic sites and the known significant roles for HSP70 in excitotoxicity, there are remarkably few studies that have explored the potential role of HSP70 family proteins in physiological functions of neurons. Here we bring together direct and indirect evidences which suggest that several different pathways involved in long-term potentiation can influence the HSP70 levels at the synapse and hypothesize on possible physiological significance of this family of proteins in neuronal functions. 相似文献
15.
16.
Decreased expression of the stress protein HSP70 is an early event in murine erythroleukemic cell differentiation. 总被引:1,自引:1,他引:1
下载免费PDF全文

Two-dimensional protein gels were used to systematically assess changes in gene expression in Friend erythroleukemia cells after exposure to inducers of differentiation. A rapid decrease in expression of the stress protein HSP70 was observed after exposure to inducers. The kinetics of this change suggest that it may be related to the cellular events that regulate the onset of differentiation. 相似文献
17.
Juliann G Kiang Phillip D Bowman Brian W Wu Nyasa Hampton Andrew G Kiang Baiteng Zhao Yuang-Taung Juang James L Atkins George C Tsokos 《Journal of applied physiology》2004,97(2):564-569
The aim of this study was to determine whether hemorrhage affects the levels of a variety of stress-related proteins and whether changes can be inhibited by drugs reported to provide protection from ischemia and reperfusion injury. Male Swiss Webster mice were subjected to a 40% hemorrhage without resuscitation. Western blot analysis indicated that c-Jun (an AP-1 protein), Kruppel-like factor 6 (KFL6), and inducible nitric oxide synthase (iNOS) were upregulated sequentially in that order. Pretreatment of mice with geldanamycin (GA) 16 h before hemorrhage effectively inhibited the expression of the proteins KLF6 and iNOS, whereas caffeic acid phenethyl ester did not. GA pretreatment increased inducible heat shock protein (HSP) 70 but not HSP90 in both sham and hemorrhagic tissues. The overexpressed inducible HSP70 formed complexes with KLF6 and iNOS. These results suggest that GA may be therapeutically useful for reducing hemorrhage-induced injury when used as a presurgical treatment or when added to resuscitation fluids. 相似文献
18.
M A Latushev 《Ukrainski? biokhimicheski? zhurnal》1980,52(6):778-782
A quick sensitive test is suggested to determine choline kinase (EC 2.7.1.32). The method includes incubation of a substrate with enzyme in microvolume and separation of the formed phosphorylcholine from the initial choline by high-performance thin-layer silica gel chromatography. The procedure of determination is simple, reproducible and takes no more than 30 min. The method reveals high activity of choline kinase in some marine invertebrates. Certain features of the enzyme from the intestine of strongylocentrotus intermedius are described. 相似文献
19.
S Nagaoka S Matsubara M Kato S Uchida M Uemura T Sakimura N Ogawa H K Nakamura 《Biological Sciences in Space》1999,13(4):327-332
Vestibular Function Experiment Unit (VFEU), one of the Spacelab facility flown in Neurolab mission (STS-90) in April, 1998, was to support neurophysiological research using a marine fish, Opsanus tau (oyster toadfish). The functions of the VFEU were primarily a quality management of environmental water during the mission at 14 degrees C and for acquiring physiological signals from implanted micro-electrodes in the otolith nerves as well as the spatial acceleration of the fish. A key element of the life support system was a balanced biological filter containing two types of nitrifying bacteria, Nitrosomonas for ammonia oxidization and Nitrobacter for nitrite oxidization. Although the 16 days mission was successful, two toadfishes died in late phase of the mission. Ammonium concentration in those two life support systems elevated to remarkably high level at the end of the mission whereas the other two indicated very low. This report summarizes the results of the water quality management of the VFEU during the Neurolab mission based on analysis of water samples taken during the flight and those taken prior and just after the flight. 相似文献
20.
牛源HSP70基因点突变、分子进化和pET32a-c(+)原核表达 总被引:4,自引:0,他引:4
设计引物PCR方法克隆了奶牛1926bp的HSP70基因,连接到pGEMR○-T Easy Vector上测序,与NCBI上的序列比对,发现开放阅读框内的点突变(941位点,T→C),致使314位L(亮氨酸)→P(脯氨酸)。DNAstar Protean分析点突变对蛋白的原核表达一、二级结构、等电点进行了分析,结果显示螺旋转角区数目增多,不规则卷曲发生轻微变化,但其它指标均不变。此外,通过DNAstar MegAlign用Clustal V方法分析HSP70家族蛋白的同源性、氨基酸残基替换频率并构建了分子进化树,结果发现碱性、酸性氨基酸(R和K)、分支的氨基酸(V和L)、极性氨基酸(S和T)等在生物HSP70分子进化中氨基酸发生替换的频率最高,HSP70可以作为研究生物系统演化的一个重要的工具。在上述基础上,在HSP70基因上、下游引物分别加上EcoRⅠ和HindⅢ酶切位点,构建了pET-32a-c( )-bHSP70原核表达质粒,IPTG诱导成功得到重组牛源HSP70蛋白,293细胞和Hela细胞的体外实验表明原核表达的蛋白有抗凋亡生物活性[动物学报51(6)1080-1090,2005]。 相似文献