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Characterization and functional analysis of Cshsp19.0 encoding a small heat shock protein in Chilo suppressalis (Walker). Int J Biol Macromol 2021; 188:924-931. [PMID: 34352319 DOI: 10.1016/j.ijbiomac.2021.07.186] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 07/27/2021] [Accepted: 07/29/2021] [Indexed: 11/22/2022]
Abstract
Small heat shock proteins (sHSPs) function as ATP-independent chaperones that preserve cellular proteostasis under stressful conditions. In this study, Cshsp19.0, which encodes a new small heat shock protein, was isolated and characterized from Chilo suppressalis (Walker) to better understand the contribution of sHSPs to insect development and stress tolerance. The full-length Cshsp19.0 cDNA was 697 bp and encoded a 19.0 kDa protein with an isoelectric point of 5.95. Phylogenetic analysis and amino acid alignments indicated that Cshsp19.0 is a member of the sHSP family. Cshsp19.0 was expressed at maximal levels in foreguts and showed the least amount of expression in fat bodies. Expression analysis in different developmental stages of C. suppressalis revealed that Cshsp19.0 was most highly expressed in 1st instar larvae. Furthermore, Cshsp19.0 was upregulated when insects were exposed to heat and cold stress for a 2-h period. There were significant differences in the male and female pupae in response to humidity; Cshsp19.0 expression increased in male pupae as RH increased, whereas the inverse pattern was observed in female pupae. Larvae exhibited a lower rate of survival when Cshsp19.0 was silenced by a nanomaterial-promoted RNAi method. The results confirm that Cshsp19.0 functions to increase environmental stress tolerance and regulates physiological activities in C. suppressalis.
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Tian C, Li Y, Wu Y, Chu W, Liu H. Sustaining induced heat shock protein 70 confers biological thermotolerance in a high-temperature adapted predatory mite Neoseiulus barkeri (Hughes). PEST MANAGEMENT SCIENCE 2021; 77:939-948. [PMID: 32979024 DOI: 10.1002/ps.6104] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 09/05/2020] [Accepted: 09/26/2020] [Indexed: 05/19/2023]
Abstract
BACKGROUND In fluctuating climatic environments, heat acclimation in predatory mites is a superior adaptation strategy for effective agricultural pest management and can be used to enhance the abilities critical in biological control efficiency. We investigated the regulatory mechanism governing the remarkable plastic response of thermotolerance in a high-temperature adapted strain (HTAS) and discerned the differences in the defensive reactions between the HTAS and the conventional strain (CS) in the predatory mite Neoseiulus barkeri. RESULTS At 42 °C, the relative expression levels of four identified HSP70 genes increased rapidly in both N. barkeri strains; meanwhile the expression of NbHSP70-1 and NbHSP70-2 in CS sharply decreased after 4 h, displaying a distinct contrast with the remaining elevated expression in HTAS. Western blot analysis showed that the protein level of NbHSP70-1 in CS was dramatically elevated at 0.5 h and decreased at 6 h at 42 °C. Conversely, in HTAS, NbHSP70-1 was constantly induced and peaked at 6 h at 42 °C. Furthermore, HSP70 suppression by RNAi knockdown had a greater influence on the survival of HTAS, causing a higher mortality under high temperature than CS. Finally, the recombinant exogenous NbHSP70-1 protein enhanced the viability of E. coli BL21 under a lethal temperature of 50 °C. CONCLUSION Sustained accumulation of HSP70 proteins results in predatory phytoseiid mites with the thermotolerance advantage that could promote their biological control function to pests. The divergent constitutive regulation of HSP70 to a thermal environment is conducive to the flexible adaptability of predators in the higher trophic level to trade off under extremely adversity stress.
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Affiliation(s)
- Chuanbei Tian
- Chongqing Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China
| | - Yaying Li
- Chongqing Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China
| | - Yixia Wu
- Chongqing Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China
| | - Wenqiang Chu
- Chongqing Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China
| | - Huai Liu
- Chongqing Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China
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Chen X, Tan A, Palli SR. Identification and functional analysis of promoters of heat-shock genes from the fall armyworm, Spodoptera frugiperda. Sci Rep 2020; 10:2363. [PMID: 32047182 PMCID: PMC7012861 DOI: 10.1038/s41598-020-59197-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 01/03/2020] [Indexed: 11/09/2022] Open
Abstract
The functional information on heat-shock proteins (Hsp) and heat-shock promoters from an important agricultural insect pest, Spodoptera frugiperda, is still lacking. We conducted a genome-wide identification of Hsp genes and identified a total of 21 genes belonging to four major insect Hsp families (small heat-shock proteins, Hsp60, Hsp70, and Hsp90) in S. frugiperda. Expression of most of S. frugiperda (SfHsp) genes could be detected in Sf9 cells, embryos and larval tissues of S. frugiperda. The heat-inducible activity of heat-shock promoters from several SfHsp genes was tested in Sf9 cells and embryos. The promoter of SfHsp70D showed the high constitutive activity in cell line and embryos, while the activity of SfHsp20.15 and SfHsp20.71 promoters was most dramatically induced in Sf9 cells and embryos. In embryos, the heat-induced activity of SfHsp20.71 and SfHsp70D promoters outperformed commercially used ie1 and ie2 promoters. The heat-induced activity of SfHsp70D and SfHsp19.07 promoters were more robust than ie2 promoter in Sf9 cells. These SfHsp promoters with high basal activity or with heat-induced activity from low basal activity, could be used in S. frugiperda or other lepidopteran insects for many applications including transgenesis and genome editing.
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Affiliation(s)
- Xien Chen
- Department of Entomology, College of Agriculture, Food and Environment, University of Kentucky, Lexington, KY, 40546, United States of America
| | - Anjiang Tan
- Key Laboratory of Insect Developmental and Evolutionary Biology, Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, 200032, China
| | - Subba Reddy Palli
- Department of Entomology, College of Agriculture, Food and Environment, University of Kentucky, Lexington, KY, 40546, United States of America.
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Weldon CW, Mnguni S, Démares F, du Rand EE, Malod K, Manrakhan A, Nicolson SW. Adult diet does not compensate for impact of a poor larval diet on stress resistance in a tephritid fruit fly. ACTA ACUST UNITED AC 2019; 222:jeb.192534. [PMID: 30819722 DOI: 10.1242/jeb.192534] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Accepted: 02/25/2019] [Indexed: 11/20/2022]
Abstract
Adult holometabolous insects may derive metabolic resources from either larval or adult feeding, but little is known of whether adult diets can compensate for deficiencies in the larval diet in terms of stress resistance. We investigated how stress resistance is affected and compensated for by diet across life stages in the marula fruit fly Ceratitis cosyra (Diptera: Tephritidae). Larvae were fed diets containing either 8% torula yeast, the standard diet used to rear this species, or 1% yeast (low protein content similar to known host fruit). At emergence, adults from each larval diet were tested for initial mass, water content, body composition, and desiccation and starvation resistance or they were allocated to one of two adult diet treatments: sucrose only, or sucrose and yeast hydrolysate. The same assays were then repeated after 10 days of adult feeding. Development on a low protein larval diet led to lower body mass and improved desiccation and starvation resistance in newly emerged adults, even though adults from the high protein larval diet had the highest water content. Adult feeding decreased desiccation or starvation resistance, regardless of the diet provided. Irrespective of larval diet history, newly emerged, unfed adults had significantly higher dehydration tolerance than those that were fed. Lipid reserves played a role in starvation resistance. There was no evidence for metabolic water from stored nutrients extending desiccation resistance. Our findings show the possibility of a nutrient-poor larval environment leading to correlated improvement in adult performance, at least in the short term.
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Affiliation(s)
- Christopher W Weldon
- Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
| | - Sandiso Mnguni
- Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
| | - Fabien Démares
- Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
| | - Esther E du Rand
- Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
| | - Kevin Malod
- Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
| | - Aruna Manrakhan
- Citrus Research International, PO Box 28, Nelspruit 1200, South Africa
| | - Susan W Nicolson
- Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
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Thorat L, Nath BB. Insects With Survival Kits for Desiccation Tolerance Under Extreme Water Deficits. Front Physiol 2018; 9:1843. [PMID: 30622480 PMCID: PMC6308239 DOI: 10.3389/fphys.2018.01843] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 12/06/2018] [Indexed: 12/31/2022] Open
Abstract
The year 2002 marked the tercentenary of Antonie van Leeuwenhoek's discovery of desiccation tolerance in animals. This remarkable phenomenon to sustain 'life' in the absence of water can be revived upon return of hydrating conditions. Today, coping with climate change-related factors, especially temperature-humidity imbalance, is a global challenge. Under such adverse circumstances, desiccation tolerance remains a prime mechanism of several plants and a few animals to escape the hostile consequences of fluctuating hydroperiodicity patterns in their habitats. Among small animals, insects have demonstrated impressive resilience to dehydration and thrive under physiological water deficits without compromising on revival and survival upon rehydration. The focus of this review is to compile research insights on insect desiccation tolerance, gathered over the past several decades from numerous laboratories worldwide working on different insect groups. We provide a comparative overview of species-specific behavioral changes, adjustments in physiological biochemistry and cellular and molecular mechanisms as few of the noteworthy desiccation-responsive survival kits in insects. Finally, we highlight the role of insects as potential mechanistic models in tracking global warming which will form the basis for translational research to mitigate periods of climatic uncertainty predicted for the future.
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Affiliation(s)
- Leena Thorat
- Stress Biology Research Laboratory, Department of Zoology, Savitribai Phule Pune University, Pune, India
| | - Bimalendu B Nath
- Stress Biology Research Laboratory, Department of Zoology, Savitribai Phule Pune University, Pune, India
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Wu YK, Zou C, Fu DM, Zhang WN, Xiao HJ. Molecular characterization of three Hsp90 from Pieris and expression patterns in response to cold and thermal stress in summer and winter diapause of Pieris melete. INSECT SCIENCE 2018; 25:273-283. [PMID: 27791340 DOI: 10.1111/1744-7917.12414] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2016] [Revised: 09/13/2016] [Accepted: 10/07/2016] [Indexed: 06/06/2023]
Abstract
Heat shock proteins (Hsps) have been linked to stresses and winter diapause in insects, but whether they are components of summer diapause is still unknown. In this study, complementary DNAs of Hsp90 from Pieris melete, Pieris rapae and Pieris canidia named PmHsp90, PrHsp90 and PcHsp90, respectively, were cloned and sequenced. The deduced amino acid sequence consisted of 718 amino acid residues with a putative molecular mass of 82.6, 82.6 and 82.7 kDa, respectively. The amino acid sequences contained all of the five conserved signature motifs in the Hsp90 family and a bHLH protein folding activity region. The differential expression pattern of PmHsp90 in response to summer diapause and winter diapause, which are related to heat/cold stress, was investigated. Cold stress induced Hsp90 up-regulation in summer and winter diapause pupae, but not in non-diapause individuals. Heat shock up-regulated PmHsp90 gradually with an increase in temperature in summer diapause, and PmHsp90 was rapidly up-regulated in winter diapause. After 30 min heat shock at 39°C, substantial up-regulation of PmHsp90 transcript levels were observed both in summer and winter diapause. However, in non-diapause a relatively stable expression was found under different durations of 39°C heat shock. Compared to the optimal treatment of 18°C for diapause development, a high temperature acclimation of 31°C induced PmHsp90 up-regulation in summer diapause, whereas a low temperature acclimation of 4°C induced up-regulation in winter diapause. The current results indicate that Hsp90 may play an important role in response to heat/cold stress both in summer and winter diapause.
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Affiliation(s)
- Yue-Kun Wu
- Institute of Entomology, Jiangxi Agricultural University, Nanchang, China
| | - Chao Zou
- Institute of Entomology, Jiangxi Agricultural University, Nanchang, China
| | - Dao-Meng Fu
- Institute of Entomology, Jiangxi Agricultural University, Nanchang, China
| | - Wan-Na Zhang
- Institute of Entomology, Jiangxi Agricultural University, Nanchang, China
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Hai-Jun Xiao
- Institute of Entomology, Jiangxi Agricultural University, Nanchang, China
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8
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Involvement of Heat Shock Proteins in Invertebrate Anhydrobiosis. HEAT SHOCK PROTEINS AND STRESS 2018. [DOI: 10.1007/978-3-319-90725-3_10] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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9
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Xiang XL, Jiang RM, Chen YY, Ge YL, Wen XL, Xi YL. Regulation of heat shock protein 70 (Hsp70) levels in the bdelloid rotifer Rotaria rotatoria under temperature stress. Isr J Ecol Evol 2017. [DOI: 10.1163/22244662-06301001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The bdelloid rotifer is an important component of freshwater zooplankton, exhibiting the features of parthenogenesis and anhydrobiotic capability. Heat shock proteins (Hsps), acting as molecular chaperones, are a highly conserved, ubiquitously expressed family of stress response proteins. In this study, the thermal optimums for heat-shock response and the levels of Hsp70 in Rotaria rotatoria (bdelloid rotifer) under different stress conditions were evaluated using survival assays and western blotting with fluorescent detection. The results showed that: (1) The survivorship in R. rotatoria were 100% throughout the temperature range of 12°C to 40°C, and the population growth rate reached its culmination at 28°C, suggesting the retardation of growth and reproduction at the other temperatures; (2) While stressed under 40°C, the levels of Hsp70 in R. rotatoria increased significantly over time, correlating with the duration of the stress; (3) As responses to different temperatures, the synthesis of Hsp70 could be induced significantly in R. rotatoria under both of high (40°C) and low (16°C) temperatures; (4) After removal of the thermal stress and recovery at 28°C, the levels of Hsp70 continued to rise for a period of time, peaked at 12 h, and then slowly declined with the extension of recovery duration, until there is no significant difference of Hsp70 levels. Summarily, with the fluctuations of stress duration and temperature, the rotifers could adapt to the environments sensitively by regulating the synthesis of Hsp70.
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Affiliation(s)
- Xian-Ling Xiang
- a College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, P.R. China
- b Key Laboratory of Biotic Environment and Ecological Safety in Anhui Province, Wuhu 241000, Anhui, P.R. China
| | - Rui-Ming Jiang
- a College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, P.R. China
| | - Ying-Ying Chen
- a College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, P.R. China
| | - Ya-Li Ge
- a College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, P.R. China
- b Key Laboratory of Biotic Environment and Ecological Safety in Anhui Province, Wuhu 241000, Anhui, P.R. China
| | - Xin-Li Wen
- a College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, P.R. China
- b Key Laboratory of Biotic Environment and Ecological Safety in Anhui Province, Wuhu 241000, Anhui, P.R. China
| | - Yi-Long Xi
- a College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, P.R. China
- b Key Laboratory of Biotic Environment and Ecological Safety in Anhui Province, Wuhu 241000, Anhui, P.R. China
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Rosendale AJ, Romick-Rosendale LE, Watanabe M, Dunlevy ME, Benoit JB. Mechanistic underpinnings of dehydration stress in the American dog tick revealed through RNA-Seq and metabolomics. ACTA ACUST UNITED AC 2017; 219:1808-19. [PMID: 27307540 DOI: 10.1242/jeb.137315] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 03/17/2016] [Indexed: 01/22/2023]
Abstract
Ticks are obligate blood feeders but spend the majority of their lifetime off-host where they must contend with a multitude of environmental stresses. Survival under desiccating conditions is a determinant for habitats where ticks can become established, and water-balance characteristics of ticks have been extensively studied. However, little is known about the underlying aspects associated with dehydration stress in ticks. In this study, we examined the response of male American dog ticks, Dermacentor variabilis, to dehydration using a combined transcriptomics and metabolomics approach. During dehydration, 497 genes were differentially expressed, including an up-regulation of stress-response and protein-catabolism genes and concurrent down-regulation of several energetically expensive biological processes. Accumulation of several metabolites, including specific amino acids, glycerol and gamma aminobutyric acid (GABA), and transcript shifts in the associated pathways for generating these metabolites indicated congruence between changes in the metabolome and gene expression. Ticks treated with exogenous glycerol and GABA demonstrated altered water-balance characteristics; specifically, increased water absorption at high relative humidity. Finally, we observed changes in locomotor activity in response to dehydration, but this change was not influenced by the accumulation of GABA. Overall, the responses to dehydration by these ticks were similar to those observed in other dehydration-tolerant arthropods, but several molecular and behavioral responses are distinct from those associated with other taxa.
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Affiliation(s)
- Andrew J Rosendale
- Department of Biological Sciences, University of Cincinnati, Cincinnati, OH 45221, USA
| | | | - Miki Watanabe
- Division of Pathology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Megan E Dunlevy
- Department of Biological Sciences, University of Cincinnati, Cincinnati, OH 45221, USA
| | - Joshua B Benoit
- Department of Biological Sciences, University of Cincinnati, Cincinnati, OH 45221, USA
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Jiang X, Tang T, Zhao H, Song Q, Zhou H, Han Q, Diao X. Differential gene responses in the embryo of the green mussel Perna viridis exposed to dichlorodiphenyltrichloroethane (DDT). Toxicol Res (Camb) 2017; 6:477-486. [PMID: 30090516 PMCID: PMC6062083 DOI: 10.1039/c7tx00087a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2017] [Accepted: 04/17/2017] [Indexed: 01/08/2023] Open
Abstract
The green-lipped mussel, Perna viridis, is considered to be an ideal indicator for marine environmental pollution. Dichlorodiphenyltrichloroethane (DDT), a typical persistent organic pollutant, is extensively distributed in marine environments. However, little is known about the toxic effects of DDT on the embryo of marine animals, particularly in marine bivalves. Using next-generation sequencing technology, we studied P. viridis embryo after DDT stress at the transcriptome level. A total of 99 202 unigenes were obtained based on the 2383 bp of unigene N50. These differentially expressed genes (DEGs) participated in the various molecular pathways of biological effects, including oxidative stress, detoxification, innate immunity and neurobehavioral disease. Quantitative real-time PCR was performed to verify the mRNA expression of several genes identified by differential gene expression (DGE) analysis. The results indicated that DDT was in induced a dose-dependent manner in the embryo of P. viridis, and most genes involved in oxidative stress and detoxification were up-regulated by DDT exposure; however, the immunity-related genes were down-regulated, except the genes involved in phagocytosis. Gene expression changes in embryo from P. viridis provide a preliminary basis to better understand the molecular toxic response mechanisms of embryo to DDT.
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Affiliation(s)
- Xiu Jiang
- State Key Laboratory of Marine Resource Utilization in South China Sea , Hainan University , Haikou 570228 , China
- Institute of Tropical Agriculture and Forestry , Hainan University , Haikou 570228 , China .
| | - Tianle Tang
- State Key Laboratory of Marine Resource Utilization in South China Sea , Hainan University , Haikou 570228 , China
- School of Tropical and Laboratory Medicine , Hainan Medical University , Haikou , 571199 , China
| | - Hongwei Zhao
- State Key Laboratory of Marine Resource Utilization in South China Sea , Hainan University , Haikou 570228 , China
- School of Tropical and Laboratory Medicine , Hainan Medical University , Haikou , 571199 , China
| | - Qinqin Song
- State Key Laboratory of Marine Resource Utilization in South China Sea , Hainan University , Haikou 570228 , China
- Institute of Tropical Agriculture and Forestry , Hainan University , Haikou 570228 , China .
| | - Hailong Zhou
- State Key Laboratory of Marine Resource Utilization in South China Sea , Hainan University , Haikou 570228 , China
- Institute of Tropical Agriculture and Forestry , Hainan University , Haikou 570228 , China .
| | - Qian Han
- State Key Laboratory of Marine Resource Utilization in South China Sea , Hainan University , Haikou 570228 , China
- Institute of Tropical Agriculture and Forestry , Hainan University , Haikou 570228 , China .
| | - Xiaoping Diao
- State Key Laboratory of Marine Resource Utilization in South China Sea , Hainan University , Haikou 570228 , China
- Institute of Tropical Agriculture and Forestry , Hainan University , Haikou 570228 , China .
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Nguyen AD, DeNovellis K, Resendez S, Pustilnik JD, Gotelli NJ, Parker JD, Cahan SH. Effects of desiccation and starvation on thermal tolerance and the heat-shock response in forest ants. J Comp Physiol B 2017; 187:1107-1116. [DOI: 10.1007/s00360-017-1101-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 04/17/2017] [Accepted: 04/19/2017] [Indexed: 12/21/2022]
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13
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Sørensen JG, Schou MF, Loeschcke V. Evolutionary adaptation to environmental stressors: a common response at the proteomic level. Evolution 2017; 71:1627-1642. [PMID: 28369831 DOI: 10.1111/evo.13243] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Accepted: 03/23/2017] [Indexed: 02/06/2023]
Abstract
Mechanistic trade-offs between traits under selection can shape and constrain evolutionary adaptation to environmental stressors. However, our knowledge of the quantitative and qualitative overlap in the molecular machinery among stress tolerance traits is highly restricted by the challenges of comparing and interpreting data between separate studies and laboratories, as well as to extrapolating between different levels of biological organization. We investigated the expression of the constitutive proteome (833 proteins) of 35 Drosophila melanogaster replicate populations artificially selected for increased resistance to six different environmental stressors. The evolved proteomes were significantly differentiated from replicated control lines. A targeted analysis of the constitutive proteomes revealed a regime-specific selection response among heat-shock proteins, which provides evidence that selection also adjusts the constitutive expression of these molecular chaperones. Although the selection response in some proteins was regime specific, the results were dominated by evidence for a "common stress response." With the exception of high temperature survival, we found no evidence for negative correlations between environmental stress resistance traits, meaning that evolutionary adaptation is not constrained by mechanistic trade-offs in regulation of functional important proteins. Instead, standing genetic variation and genetic trade-offs outside regulatory domains likely constrain the evolutionary responses in natural populations.
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Affiliation(s)
- Jesper G Sørensen
- Section of Genetics, Ecology and Evolution, Department of Bioscience, Aarhus University, Ny Munkegade 116, DK-8000, Aarhus C, Denmark
| | - Mads F Schou
- Section of Genetics, Ecology and Evolution, Department of Bioscience, Aarhus University, Ny Munkegade 116, DK-8000, Aarhus C, Denmark
| | - Volker Loeschcke
- Section of Genetics, Ecology and Evolution, Department of Bioscience, Aarhus University, Ny Munkegade 116, DK-8000, Aarhus C, Denmark
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Chowański S, Lubawy J, Paluch-Lubawa E, Spochacz M, Rosiński G, Słocińska M. The physiological role of fat body and muscle tissues in response to cold stress in the tropical cockroach Gromphadorhina coquereliana. PLoS One 2017; 12:e0173100. [PMID: 28253309 PMCID: PMC5333868 DOI: 10.1371/journal.pone.0173100] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 02/15/2017] [Indexed: 11/19/2022] Open
Abstract
Protective mechanisms against cold stress are well studied in terrestrial and polar insects; however, little is known about these mechanisms in tropical insects. In our study, we tested if a tropical cockroach Gromphadorhina coquereliana, possesses any protective mechanisms against cold stress. Based on the results of earlier studies, we examined how short-term (3 h) cold (4°C) influences biochemical parameters, mitochondrial respiration activity, and the level of HSPs and aquaporins expression in the fat body and leg muscles of G. coquereliana. Following cold exposure, we found that the level of carbohydrates, lipids and proteins did not change significantly. Nevertheless, we observed significant changes in mitochondrial respiration activity. The oxygen consumption of resting (state 4) and phosphorylating (state 3) mitochondria was altered following cold exposure. The increase in respiratory rate in state 4 respiration was observed in both tissues. In state 3, oxygen consumption by mitochondria in fat body was significantly lower compared to control insects, whereas there were no changes observed for mitochondria in muscle tissue. Moreover, there were cold-induced changes in UCP protein activity, but the changes in activity differed in fat body and in muscles. Additionally, we detected changes in the level of HSP70 and aquaporins expression. Insects treated with cold had significantly higher levels of HSP70 in fat body and muscles. On the other hand, there were lower levels of aquaporins in both tissues following exposure to cold. These results suggest that fat body play an important role in protecting tropical insects from cold stress.
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Affiliation(s)
- Szymon Chowański
- Department of Animal Physiology and Development, Faculty of Biology, Adam Mickiewicz University in Poznań, Poznań, Poland
- * E-mail: (SC); (MS); (JL)
| | - Jan Lubawy
- Department of Animal Physiology and Development, Faculty of Biology, Adam Mickiewicz University in Poznań, Poznań, Poland
- * E-mail: (SC); (MS); (JL)
| | - Ewelina Paluch-Lubawa
- Department of Plant Physiology, Faculty of Biology, Adam Mickiewicz University in Poznań, Poznań, Poland
| | - Marta Spochacz
- Department of Animal Physiology and Development, Faculty of Biology, Adam Mickiewicz University in Poznań, Poznań, Poland
| | - Grzegorz Rosiński
- Department of Animal Physiology and Development, Faculty of Biology, Adam Mickiewicz University in Poznań, Poznań, Poland
| | - Małgorzata Słocińska
- Department of Animal Physiology and Development, Faculty of Biology, Adam Mickiewicz University in Poznań, Poznań, Poland
- * E-mail: (SC); (MS); (JL)
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Wei S, Ma X, Pan L, Miao J, Fu J, Bai L, Zhang Z, Guan Y, Mo C, Huang H, Chen M. Transcriptome Analysis of Taxillusi chinensis (DC.) Danser Seeds in Response to Water Loss. PLoS One 2017; 12:e0169177. [PMID: 28046012 PMCID: PMC5207531 DOI: 10.1371/journal.pone.0169177] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2016] [Accepted: 12/13/2016] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Taxillus chinensis (DC.) Danser, the official species of parasitic loranthus that grows by parasitizing other plants, is used in various traditional Chinese medicine prescriptions. ABA-dependent and ABA-independent pathways are two major pathways in response to drought stress for plants and some genes have been reported to play a key role during the dehydration including dehydration-responsive protein RD22, late embryogenesis abundant (LEA) proteins, and various transcription factors (TFs) like MYB and WRKY. However, genes responding to dehydration are still unknown in loranthus. METHODS AND RESULTS Initially, loranthus seeds were characterized as recalcitrant seeds. Then, biological replicates of fresh loranthus seeds (CK), and seeds after being dehydrated for 16 hours (Tac-16) and 36 hours (Tac-36) were sequenced by RNA-Seq, generating 386,542,846 high quality reads. A total of 164,546 transcripts corresponding to 114,971 genes were assembled by Trinity and annotated by mapping them to NCBI non-redundant (NR), UniProt, GO, KEGG pathway and COG databases. Transcriptome profiling identified 60,695, 56,027 and 66,389 transcripts (>1 FPKM) in CK, Tac-16 and Tac-36, respectively. Compared to CK, we obtained 2,102 up-regulated and 1,344 down-regulated transcripts in Tac-16 and 1,649 up-regulated and 2,135 down-regulated transcripts in Tac-36 by using edgeR. Among them some have been reported to function in dehydration process, such as RD22, heat shock proteins (HSP) and various TFs (MYB, WRKY and ethylene-responsive transcription factors). Interestingly, transcripts encoding ribosomal proteins peaked in Tac-16. It is indicated that HSPs and ribosomal proteins may function in early response to drought stress. Raw sequencing data can be accessed in NCBI SRA platform under the accession number SRA309567. CONCLUSIONS This is the first time to profile transcriptome globally in loranthus seeds. Our findings provide insights into the gene regulations of loranthus seeds in response to water loss and expand our current understanding of drought tolerance and germination of seeds.
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Affiliation(s)
- Shugen Wei
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
- Guangxi Botanical Garden of Medicinal Plants, Nanning, Guangxi, China
| | - Xiaojun Ma
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
- * E-mail: (XM); (JF)
| | - Limei Pan
- Guangxi Botanical Garden of Medicinal Plants, Nanning, Guangxi, China
| | - Jianhua Miao
- Guangxi Botanical Garden of Medicinal Plants, Nanning, Guangxi, China
| | - Jine Fu
- Guangxi Botanical Garden of Medicinal Plants, Nanning, Guangxi, China
- * E-mail: (XM); (JF)
| | - Longhua Bai
- Yunnan Branch Institute of Medicinal Plant Development, Chinese Academy of Medical Science, Jinghong, China
| | - Zhonglian Zhang
- Yunnan Branch Institute of Medicinal Plant Development, Chinese Academy of Medical Science, Jinghong, China
| | - Yanhong Guan
- Yunnan Branch Institute of Medicinal Plant Development, Chinese Academy of Medical Science, Jinghong, China
| | - Changming Mo
- Guangxi Botanical Garden of Medicinal Plants, Nanning, Guangxi, China
| | - Hao Huang
- Guangxi Botanical Garden of Medicinal Plants, Nanning, Guangxi, China
| | - Maoshan Chen
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science (LIMS), La Trobe University, Melbourne, Victoria, Australia
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Jiang X, Qiu L, Zhao H, Song Q, Zhou H, Han Q, Diao X. Transcriptomic responses of Perna viridis embryo to Benzo(a)pyrene exposure elucidated by RNA sequencing. CHEMOSPHERE 2016; 163:125-132. [PMID: 27522184 DOI: 10.1016/j.chemosphere.2016.07.091] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 07/12/2016] [Accepted: 07/28/2016] [Indexed: 06/06/2023]
Abstract
The green mussel Perna viridis is an ideal biomonitor to evaluate marine environmental pollution. Benzo(a)pyrene (BaP) is a typical polycyclic aromatic hydrocarbon (PAH), which is well known for the mutagenic and carcinogenic characteristics. However, the toxicological effects of BaP on Perna viridis embryo are still unclear. In this study, we investigated the embryo transcriptomic profile of Perna viridis treated with BaP via digital gene expression analysis. A total of 92,362,742 reads were produced from two groups (control and BaP exposure) by whole transcriptome sequencing (RNA-Seq). Gene Ontology (GO) and Kyoto Encyclopaedia of Genes and Genomes (KEGG) pathway analysis were used on all genes to determine the biological functions and processes. Genes involved in various molecular pathways of toxicological effects were enriched further. The differential expression genes (DEGs) were related to stress response, infectious disease and innate immunity. Quantitative real-time PCR (qRT-PCR) measured expressional levels of six genes confirmed through the DGE analysis. This study reveals that RNA-seq for transcriptome profiling of P. viridis embryo can better understand the embryo toxic effects of BaP. Furthermore, it also suggests that RNA-seq is a superior tool for generating novel and valuable information for revealing the toxic effects caused by BaP at transcriptional level.
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Affiliation(s)
- Xiu Jiang
- State Key Laboratory of South China Sea Marine Resource Utilization, Hainan University, Haikou, 570228, China; College of Agriculture, Hainan University, Haikou, 570228, China
| | - Liguo Qiu
- State Key Laboratory of South China Sea Marine Resource Utilization, Hainan University, Haikou, 570228, China; College of Agriculture, Hainan University, Haikou, 570228, China
| | - Hongwei Zhao
- State Key Laboratory of South China Sea Marine Resource Utilization, Hainan University, Haikou, 570228, China; College of Environment and Plant Protection, Hainan University, Haikou 570228, China
| | - Qinqin Song
- College of Agriculture, Hainan University, Haikou, 570228, China
| | - Hailong Zhou
- State Key Laboratory of South China Sea Marine Resource Utilization, Hainan University, Haikou, 570228, China; College of Agriculture, Hainan University, Haikou, 570228, China.
| | - Qian Han
- State Key Laboratory of South China Sea Marine Resource Utilization, Hainan University, Haikou, 570228, China; College of Agriculture, Hainan University, Haikou, 570228, China
| | - Xiaoping Diao
- State Key Laboratory of South China Sea Marine Resource Utilization, Hainan University, Haikou, 570228, China; College of Agriculture, Hainan University, Haikou, 570228, China; College of Environment and Plant Protection, Hainan University, Haikou 570228, China.
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17
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Piri N, Kwong JMK, Gu L, Caprioli J. Heat shock proteins in the retina: Focus on HSP70 and alpha crystallins in ganglion cell survival. Prog Retin Eye Res 2016; 52:22-46. [PMID: 27017896 PMCID: PMC4842330 DOI: 10.1016/j.preteyeres.2016.03.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Revised: 03/14/2016] [Accepted: 03/22/2016] [Indexed: 10/22/2022]
Abstract
Heat shock proteins (HSPs) belong to a superfamily of stress proteins that are critical constituents of a complex defense mechanism that enhances cell survival under adverse environmental conditions. Cell protective roles of HSPs are related to their chaperone functions, antiapoptotic and antinecrotic effects. HSPs' anti-apoptotic and cytoprotective characteristics, their ability to protect cells from a variety of stressful stimuli, and the possibility of their pharmacological induction in cells under pathological stress make these proteins an attractive therapeutic target for various neurodegenerative diseases; these include Alzheimer's, Parkinson's, Huntington's, prion disease, and others. This review discusses the possible roles of HSPs, particularly HSP70 and small HSPs (alpha A and alpha B crystallins) in enhancing the survival of retinal ganglion cells (RGCs) in optic neuropathies such as glaucoma, which is characterized by progressive loss of vision caused by degeneration of RGCs and their axons in the optic nerve. Studies in animal models of RGC degeneration induced by ocular hypertension, optic nerve crush and axotomy show that upregulation of HSP70 expression by hyperthermia, zinc, geranyl-geranyl acetone, 17-AAG (a HSP90 inhibitor), or through transfection of retinal cells with AAV2-HSP70 effectively supports the survival of injured RGCs. RGCs survival was also stimulated by overexpression of alpha A and alpha B crystallins. These findings provide support for translating the HSP70- and alpha crystallin-based cell survival strategy into therapy to protect and rescue injured RGCs from degeneration associated with glaucomatous and other optic neuropathies.
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Affiliation(s)
- Natik Piri
- Stein Eye Institute, University of California, Los Angeles, CA 90095, USA; Brain Research Institute, University of California, Los Angeles, CA 90095, USA.
| | - Jacky M K Kwong
- Stein Eye Institute, University of California, Los Angeles, CA 90095, USA
| | - Lei Gu
- Stein Eye Institute, University of California, Los Angeles, CA 90095, USA
| | - Joseph Caprioli
- Stein Eye Institute, University of California, Los Angeles, CA 90095, USA; Brain Research Institute, University of California, Los Angeles, CA 90095, USA
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18
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Identification, genomic organization and expression profiles of four heat shock protein genes in the western flower thrips, Frankliniella occidentalis. J Therm Biol 2016; 57:110-8. [PMID: 27033046 DOI: 10.1016/j.jtherbio.2016.03.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 03/11/2016] [Accepted: 03/13/2016] [Indexed: 11/21/2022]
Abstract
The western flower thrips, Frankliniella occidentalis, is an important invasive pest with a strong tolerance for extreme temperatures; however, the molecular mechanisms that regulate thermotolerance in this insect remain unclear. In this study, four heat shock protein genes were cloned from F. occidentalis and named Fohsp90, Fohsc701, Fohsc702 and Fohsp60. These four Hsps exhibited typical characteristics of heat shock proteins. Subcellular localization signals and phylogenetic analysis indicated that FoHsp90 and FoHsc701 localize to the cytosol, whereas FoHsc702 and FoHsp60 were located in the endoplasmic reticulum and mitochondria, respectively. Analysis of genomic sequences revealed the presence of introns in the four genes (three, four, seven, and five introns for Fohsp90, Fohsc701, Fohsc702 and Fohsp60, respectively). Both the number and position of introns in these four genes were quite different from analogous genes in other species. qRT-PCR indicated that the four Fohsps were detected in second-stage larvae, one-day-old pupae, and one-day-old adults, and mRNA expression levels were lowest in larvae and highest in pupae. Fohsc701 and Fohsc702 possessed similar expression patterns and were not induced by cold or heat stress. Expression of Fohsp60 was significantly elevated by heat, and Fohsp90 was rapidly up-regulated after exposure to both cold and heat stress. Exposure to -8°C had no effect on expression of the four Fohsps; however, expression of Fohsp90 and Fohsp60 was highest after a 2-h incubation at 39°C. Furthermore, cold and heat hardening led to significant up-regulation of the four Fohsps compared to their respective controls. Collectively, our results indicate that the four FoHsps contribute to insect development and also function in rapid cold or heat hardening; furthermore, FoHsp90 and FoHsp60 contribute to thermotolerance in F. occidentalis.
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19
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Shang Q, Pan Y, Peng T, Yang S, Lu X, Wang Z, Xi J. PROTEOMICS ANALYSIS OF OVEREXPRESSED PLASMA PROTEINS IN RESPONSE TO COLD ACCLIMATION IN Ostrinia furnacalis. ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 2015; 90:195-208. [PMID: 26440752 DOI: 10.1002/arch.21302] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Many insects in temperate regions overwinter in diapause. In these insects, one of the metabolic adaptations to cold stress is the synthesis of responsive proteins. Using proteomic analysis, an investigation aimed to a better understanding of the molecular adaptation mechanisms to cold stress was carried out in Ostrinia furnacalis larva. Proteins were extracted from the larval hemolymph collected from both control and overwintering larva. By polyethylene glycol precipitation, approximately 560 protein spots were separated and visualized on two-dimensional (2D) gels after silver staining. Eighteen protein spots were found to be upregulated in overwinter larval plasma in different patterns. As an initial work, 13 of these proteins were identified using MALDI TOF/TOF MS. The differentially overexpressed proteins include heat shock 70 kDa cognate protein, small heat shock protein (sHSP), putative aliphatic nitrilase, arginine kinase, phosphoglyceromutase, triosephosphateisomerase, and glutathione transferase. Alterations in the levels of these proteins were further confirmed by qPCR. This study is the first analysis of differentially expressed plasma proteins in O. furnacalis diapause larvae under extremely low temperature conditions and gives new insights into the acclimation mechanisms responsive to cold stress. Our results also support the idea that energy metabolism, alanine and proline metabolism, and antioxidative reaction act in the cold acclimation of O. furnacalis diapause larvae.
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Affiliation(s)
- Qingli Shang
- College of Plant Science, Jilin University, Changchun, P.R. China
| | - Yiou Pan
- College of Plant Science, Jilin University, Changchun, P.R. China
| | - Tianfei Peng
- College of Plant Science, Jilin University, Changchun, P.R. China
| | - Shuang Yang
- College of Plant Science, Jilin University, Changchun, P.R. China
| | - Xin Lu
- Jilin Academy of Agricultural Sciences, Changchun, P.R. China
| | - Zhenying Wang
- The State Key Lab for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Science, Beijing, P.R. China
| | - Jinghui Xi
- College of Plant Science, Jilin University, Changchun, P.R. China
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20
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Boardman L, Sørensen JG, Terblanche JS. Physiological and molecular mechanisms associated with cross tolerance between hypoxia and low temperature in Thaumatotibia leucotreta. JOURNAL OF INSECT PHYSIOLOGY 2015; 82:75-84. [PMID: 26376454 DOI: 10.1016/j.jinsphys.2015.09.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Revised: 07/24/2015] [Accepted: 09/03/2015] [Indexed: 06/05/2023]
Abstract
Biochemical adaptations allow insects to withstand exposures to hypoxia and/or hypothermia. Exposure to hypoxia may interact either synergistically or antagonistically with standard low temperature stress responses yet this has not been systematically researched and no clear mechanism has been identified to date. Using larvae of false codling moth Thaumatotibia leucotreta, a pest of southern Africa, we investigated the physiological and molecular responses to hypoxia or temperature stress pre-treatments, followed by a standard low temperature exposure. Survival rates were significantly influenced by pre-treatment conditions, although T. leucotreta shows relatively high basal resistance to various stressors (4% variation in larval survival across all pre-treatments). Results showed that mild pre-treatments with chilling and hypoxia increased resistance to low temperatures and that these responses were correlated with increased membrane fluidity (increased UFA:SFA) and/or alterations in heat shock protein 70 (HSP70); while general mechanical stress (shaking) and heat (2h at 35°C) do not elicit cross tolerance (no change in survival or molecular responses). We therefore found support for some limited cold hardening and cross tolerance responses. Given that combined exposure to hypoxia and low temperature is used to sterilize commodities in post-harvest pest management programs, researchers can now exploit these mechanisms involved in cross tolerance to develop more targeted control methods.
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Affiliation(s)
- Leigh Boardman
- Department of Conservation Ecology and Entomology, Centre for Invasion Biology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa.
| | - Jesper G Sørensen
- Section for Genetics, Ecology & Evolution, Department of Bioscience, Aarhus University, Ny Munkegade 116, DK-8000 Aarhus C, Denmark
| | - John S Terblanche
- Department of Conservation Ecology and Entomology, Centre for Invasion Biology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
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21
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Abstract
Insect heat shock proteins include ATP-independent small heat shock proteins and the larger ATP-dependent proteins, Hsp70, Hsp90, and Hsp60. In concert with cochaperones and accessory proteins, heat shock proteins mediate essential activities such as protein folding, localization, and degradation. Heat shock proteins are synthesized constitutively in insects and induced by stressors such as heat, cold, crowding, and anoxia. Synthesis depends on the physiological state of the insect, but the common function of heat shock proteins, often working in networks, is to maintain cell homeostasis through interaction with substrate proteins. Stress-induced expression of heat shock protein genes occurs in a background of protein synthesis inhibition, but in the course of diapause, a state of dormancy and increased stress tolerance, these genes undergo differential regulation without the general disruption of protein production. During diapause, when ATP concentrations are low, heat shock proteins may sequester rather than fold proteins.
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Affiliation(s)
- Allison M King
- Department of Biology, Dalhousie University, Halifax, NS, B3H 4R2, Canada; ,
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22
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Sirigineedi S, Vijayagowri E, Murthy GN, Rao G, Ponnuvel KM. Molecular characterization of DnaJ 5 homologs in silkworm Bombyx mori and its expression during egg diapause. INSECT SCIENCE 2014; 21:677-686. [PMID: 23956244 DOI: 10.1111/1744-7917.12048] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/08/2013] [Indexed: 06/02/2023]
Abstract
A comparison of the cDNA sequences (1 056 bp) of Bombyx mori DnaJ 5 homolog with B. mori genome revealed that unlike in other Hsps, it has an intron of 234 bp. The DnaJ 5 homolog contains 351 amino acids, of which 70 contain the conserved DnaJ domain at the N-terminal end. This homolog of B. mori has all desirable functional domains similar to other insects, and the 13 different DnaJ homologs identified in B. mori genome were distributed on different chromosomes. The expressed sequence tag database analysis of Hsp40 gene expression revealed higher expression in wing disc followed by diapause-induced eggs. Microarray analysis revealed higher expression of DnaJ 5 homolog at 18th h after oviposition in diapause-induced eggs. Further validation of DnaJ 5 expression through qPCR in diapause-induced and nondiapause eggs at different time intervals revealed higher expression in diapause eggs at 18 and 24 h after oviposition, which coincided with the expression of Hsp70 as the Hsp 40 is its co-chaperone. This study thus provides an outline of the genome organization of Hsp40 gene, and its role in egg diapause induction in B. mori.
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Affiliation(s)
- Sasibhushan Sirigineedi
- Genomics Division, Seribiotech Research Laboratory, Carmelaram Post, Kodathi, Bangalore, 560035, Karnataka, India
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Molecular cloning and sequence analysis of heat shock proteins 70 (HSP70) and 90 (HSP90) and their expression analysis when exposed to benzo(a)pyrene in the clam Ruditapes philippinarum. Gene 2014; 555:108-18. [PMID: 25445266 DOI: 10.1016/j.gene.2014.10.051] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 10/03/2014] [Accepted: 10/28/2014] [Indexed: 01/22/2023]
Abstract
HSP70 and HSP90 are the most important heat shock proteins (HSPs), which play the key roles in the cell as molecular chaperones and may involve in metabolic detoxification. The present research has obtained full-length cDNAs of genes HSP70 and HSP90 from the clam Ruditapes philippinarum and studied the transcriptional responses of the two genes when exposed to benzo(a)pyrene (BaP). The full-length RpHSP70 cDNA was 2336bp containing a 5' untranslated region (UTR) of 51bp, a 3' UTR of 335bp and an open reading frame (ORF) of 1950bp encoding 650 amino acid residues. The full-length RpHSP90 cDNA was 2839bp containing a 107-bp 5' UTR, a 554-bp 3' UTR and a 2178-bp ORF encoding 726 amino acid residues. The deduced amino acid sequences of RpHSP70 and RpHSP90 shared the highest identity with the sequences of Paphia undulata, and the phylogenetic trees showed that the evolutions of RpHSP70 and RpHSP90 were almost in accord with the evolution of species. The RpHSP70 and RpHSP90 mRNA expressions were detected in all tested tissues in the adult clams (digestive gland, gill, adductor muscle and mantle) and the highest mRNA expression level was observed in the digestive gland compared to other tissues. Quantitative real-time RT-PCR analysis revealed that mRNA expression levels of the clam RpHSP70, RpHSP90 and other xenobiotic metabolizing enzymes (XMEs) (AhR, DD, GST, GPx) in the digestive gland of R. philippinarum were induced by benzo(a)pyrene (BaP) and the absolute expression levels of these genes showed a temporal and dose-dependent response. The results suggested that RpHSP70 and RpHSP90 were involved in the metabolic detoxification of BaP in the clam R. philippinarum.
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Wang C, Grohme MA, Mali B, Schill RO, Frohme M. Towards decrypting cryptobiosis--analyzing anhydrobiosis in the tardigrade Milnesium tardigradum using transcriptome sequencing. PLoS One 2014; 9:e92663. [PMID: 24651535 PMCID: PMC3961413 DOI: 10.1371/journal.pone.0092663] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Accepted: 02/25/2014] [Indexed: 11/18/2022] Open
Abstract
Background Many tardigrade species are capable of anhydrobiosis; however, mechanisms underlying their extreme desiccation resistance remain elusive. This study attempts to quantify the anhydrobiotic transcriptome of the limno-terrestrial tardigrade Milnesium tardigradum. Results A prerequisite for differential gene expression analysis was the generation of a reference hybrid transcriptome atlas by assembly of Sanger, 454 and Illumina sequence data. The final assembly yielded 79,064 contigs (>100 bp) after removal of ribosomal RNAs. Around 50% of them could be annotated by SwissProt and NCBI non-redundant protein sequences. Analysis using CEGMA predicted 232 (93.5%) out of the 248 highly conserved eukaryotic genes in the assembly. We used this reference transcriptome for mapping and quantifying the expression of transcripts regulated under anhdydrobiosis in a time-series during dehydration and rehydration. 834 of the transcripts were found to be differentially expressed in a single stage (dehydration/inactive tun/rehydration) and 184 were overlapping in two stages while 74 were differentially expressed in all three stages. We have found interesting patterns of differentially expressed transcripts that are in concordance with a common hypothesis of metabolic shutdown during anhydrobiosis. This included down-regulation of several proteins of the DNA replication and translational machinery and protein degradation. Among others, heat shock proteins Hsp27 and Hsp30c were up-regulated in response to dehydration and rehydration. In addition, we observed up-regulation of ployubiquitin-B upon rehydration together with a higher expression level of several DNA repair proteins during rehydration than in the dehydration stage. Conclusions Most of the transcripts identified to be differentially expressed had distinct cellular function. Our data suggest a concerted molecular adaptation in M. tardigradum that permits extreme forms of ametabolic states such as anhydrobiosis. It is temping to surmise that the desiccation tolerance of tradigrades can be achieved by a constitutive cellular protection system, probably in conjunction with other mechanisms such as rehydration-induced cellular repair.
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Affiliation(s)
- Chong Wang
- Molecular Biotechnology and Functional Genomics, Technical University of Applied Sciences Wildau, Wildau, Germany
- * E-mail:
| | - Markus A. Grohme
- Molecular Biotechnology and Functional Genomics, Technical University of Applied Sciences Wildau, Wildau, Germany
| | - Brahim Mali
- Molecular Biotechnology and Functional Genomics, Technical University of Applied Sciences Wildau, Wildau, Germany
| | - Ralph O. Schill
- Biological Institute, Zoology, University of Stuttgart, Stuttgart, Germany
| | - Marcus Frohme
- Molecular Biotechnology and Functional Genomics, Technical University of Applied Sciences Wildau, Wildau, Germany
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Lu MX, Hua J, Cui YD, Du YZ. Five small heat shock protein genes from Chilo suppressalis: characteristics of gene, genomic organization, structural analysis, and transcription profiles. Cell Stress Chaperones 2014; 19:91-104. [PMID: 23702967 PMCID: PMC3857428 DOI: 10.1007/s12192-013-0437-8] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Revised: 05/09/2013] [Accepted: 05/10/2013] [Indexed: 10/26/2022] Open
Abstract
Small heat shock proteins (sHSPs) are the most diverse but also the most poorly known family of molecular chaperones, and they play essential roles in various biological processes. The striped stem borer, Chilo suppressalis (Insecta: Lepidoptera: Pyralidae), is one of the most serious pests of rice, causing extensive damage and yield loss. In this study, we isolated and characterized five members of the sHSPs family-Cshsp19.8, Cshsp21.4, Cshsp21.5, Cshsp21.7a, and Cshsp21.7b-from C. suppressalis. The cDNAs of these genes encoded proteins of 177, 187, 191, 191, and 191 amino acids with isoelectric points of 7.0, 5.6, 6.1, 6.3, and 6.3, respectively. While Cshsp19.8, Cshsp21.5, and Cshsp21.7b had no introns, Cshsp21.4 and Cshsp21.7a contained one and two introns, respectively. Structural analysis indicated that all five Cshsps possessed conserved arginine and a V/IXI/V motif, which is related to hydrophobic characteristics of sHSPs. The five heat shock proteins can be classified into two main groups: an orthologous type (Cshsp21.4 and Cshsp21.7a) and a species-specific type (Cshsp19.8, Cshsp21.5, and Cshsp21.7b). Real-time quantitative PCR analyses revealed that Cshsp19.8, Cshsp21.5, Cshsp21.7a, and Cshsp21.7b all exhibited their highest expression levels within Malpighian tubules or the hindgut, while such levels were found in the head for Cshsp21.4. The expression of Csshsps at different developmental stages revealed that the mRNA levels of Cshsp19.8, Cshsp21.4, Cshsp21.5, and Cshsp21.7b peaked in adults, whereas the highest level of Cshsp21.7a was observed in first instar larvae. Cshsp19.8 and Cshsp21.7b were both upregulated dramatically by heat and cold, and Cshsp21.5 could be induced by cold stress. Neither Cshsp21.4 nor Cshsp21.7a responded to heat or cold. These results demonstrated that different Csshsps play distinctive roles in the regulation of the physiological activities in C. suppressalis.
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Affiliation(s)
- Ming-Xing Lu
- />College of Horticulture and Plant Protection & Institute of Applied Entomology, Yangzhou University, Yangzhou, 225009 China
| | - Jin Hua
- />College of Horticulture and Plant Protection & Institute of Applied Entomology, Yangzhou University, Yangzhou, 225009 China
| | - Ya-Dong Cui
- />Department of Life Science, Fuyang Normal College, Fuyang, 236032 China
| | - Yu-Zhou Du
- />College of Horticulture and Plant Protection & Institute of Applied Entomology, Yangzhou University, Yangzhou, 225009 China
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26
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Mu W, Wen H, Li J, He F. Cloning and expression analysis of a HSP70 gene from Korean rockfish (Sebastes schlegeli). FISH & SHELLFISH IMMUNOLOGY 2013; 35:1111-1121. [PMID: 23877000 DOI: 10.1016/j.fsi.2013.07.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Revised: 06/27/2013] [Accepted: 07/11/2013] [Indexed: 06/02/2023]
Abstract
The gene encoding HSP70 was isolated from Korean rockfish Sebastes schlegeli by homologous cloning and rapid amplification of cDNA ends (RACE). The full-length of HSP70 cDNA was composed of 2259 bp and encoded a polypeptide of 639 amino acids. BLAST analysis showed that HSP70 of S. schlegeli shared high identities with those of the Lates calcarifer, Oreochromis niloticus, Seriola quinqueradiata HSP70s (88-89%). Our current study also revealed that HSP70 of Korean rockfish was expressed in many tissues by RT-PCR under unstressed condition. Quantitative real-time PCR showed that the expression patterns of Korean rockfish HSP70 were developmental stage-dependency. The expression of HSP70 was measured by quantitative real-time PCR after different oxygen treatments. The results showed that expression of HSP70 increased significantly after exposure to hypoxia for 30 min in gill and ovary, and then decreased for 60 min, and the level in spleen and liver gradually increased and reached the highest at 60 min. In addition, in gill, spleen and liver, the HSP70 mRNA level reached the maximum in hypoxia group after one hour different oxygen concentration stress. Increased amounts of serum thyroxine (T4), and triiodothyronine (T3) were also found during 30 min hypoxia treatment and 60 min normoxia group in our study. All of the results provide information to further study the mechanism of physiology and immune function under stress conditions of ovoviviparous teleosts.
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Affiliation(s)
- Weijie Mu
- Fisheries College, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
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Boardman L, Sørensen JG, Terblanche JS. Physiological responses to fluctuating thermal and hydration regimes in the chill susceptible insect, Thaumatotibia leucotreta. JOURNAL OF INSECT PHYSIOLOGY 2013; 59:781-794. [PMID: 23684741 DOI: 10.1016/j.jinsphys.2013.05.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Revised: 05/09/2013] [Accepted: 05/10/2013] [Indexed: 06/02/2023]
Abstract
Fluctuating thermal regimes (FTR), consisting of cycles between stressful low and benign temperatures, are known to improve survival and fecundity in a variety of insects. By contrast, fluctuating hydration regimes (FHR) consisting of cycles between dehydrating and benign conditions have been less comprehensively researched. Hypothetically, either repeated stress accumulates damage and reduces survival, or the recovery periods may act as a protective mechanism by allowing low temperature- or dehydration-induced damage to be repaired. Using false codling moth (Thaumatotibia leucotreta) larvae, we investigated whether FTR and FHR resulted in protection, or accumulated damage, at the cellular and whole-organism levels. Time- and age-matched controls were used to verify that the effects were due to the fluctuating stressors and not age- or time-dependent responses. Results showed that larval body water-(BWC) and lipid content (BLC) remained unchanged in response to FTR. Importantly though, FTR are protective when compared to constant low temperature exposures, potentially due to an increase in heat shock protein 70 (HSP70). However, larvae may suffer long-term fitness consequences compared to constant benign exposures. Results for FHR appear equivocal when compared to constant controls, due to high survival rates for all experiments, although the physiological responses to FHR included a decrease in larval BWC and BLC, a decrease in cuticular water loss rates, and a depletion of HSP70 during the final dehydration cycle. In conclusion, it appears that fluctuating stressors are protective in T. leucotreta when compared to constant stress conditions, likely through regulation of whole-animal metabolic rate and HSP70, although other mechanisms (e.g. ion homeostasis) are also implicated.
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Affiliation(s)
- Leigh Boardman
- Centre for Invasion Biology, Department of Conservation Ecology and Entomology, Faculty of AgriSciences, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa.
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Bubliy OA, Kristensen TN, Loeschcke V. Stress-induced plastic responses in Drosophila simulans following exposure to combinations of temperature and humidity levels. J Exp Biol 2013; 216:4601-7. [DOI: 10.1242/jeb.092502] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Summary
Plastic responses to heat and desiccation stress in insects have been studied in many laboratory experiments on Drosophila. However, in these studies the possible interaction between the corresponding stress factors in natural environments has not been taken into consideration. We investigated changes in heat and desiccation resistance of adult Drosophila simulans after short-term exposures to different temperatures (35ºC, 31ºC, 18ºC) in combination with high and low relative humidity (RH, ca. 90% and 20%, respectively). Hardening under extreme conditions (35ºC or 31ºC and low RH) commonly resulted in higher resistance to heat and desiccation as compared to other less stressful combinations of temperature and humidity levels. The concentration of the heat-shock protein Hsp70 in the experimental flies increased following almost all applied treatments. Life span of the hardened flies under non-stressful conditions was reduced irrespective of the stress dose indicating a fitness cost for the plastic responses. The results of the study show that hardening using combined heat-desiccation stress can be very efficient with regard to induction of plastic responses improving tolerance to both types of stress. This may favour adaptation to hot and dry climatic conditions, though the negative effects on fitness are likely to constrain evolution of such plastic responses.
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Kobey RL, Montooth KL. Mortality from desiccation contributes to a genotype-temperature interaction for cold survival in Drosophila melanogaster. ACTA ACUST UNITED AC 2012. [PMID: 23197100 DOI: 10.1242/jeb.076539] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Survival at cold temperatures is a complex trait, primarily because of the fact that the physiological cause of injury may differ across degrees of cold exposure experienced within the lifetime of an ectothermic individual. In order to better understand how chill-sensitive insects experience and adapt to low temperatures, we investigated the physiological basis for cold survival across a range of temperature exposures from -4 to 6°C in five genetic lines of the fruit fly Drosophila melanogaster. Genetic effects on cold survival were temperature dependent and resulted in a significant genotype-temperature interaction for survival across cold temperature exposures that differ by as little as 2°C. We investigated desiccation as a potential mechanism of injury across these temperature exposures. Flies were dehydrated following exposures near 6°C, whereas flies were not dehydrated following exposures near -4°C. Furthermore, decreasing humidity during cold exposure decreased survival, and increasing humidity during cold exposure increased survival at 6°C, but not at -4°C. These results support the conclusion that in D. melanogaster there are multiple physiological mechanisms of cold-induced mortality across relatively small differences in temperature, and that desiccation contributes to mortality for exposures near 6°C but not for subzero temperatures. Because D. melanogaster has recently expanded its range from tropical to temperate latitudes, the complex physiologies underlying cold tolerance are likely to be important traits in the recent evolutionary history of this fruit fly.
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Affiliation(s)
- Robert L Kobey
- Department of Biology, Indiana University, Bloomington, IN 47405, USA.
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Michail X, Kontogiannatos D, Syriou V, Kourti A. Bisphenol-A affects the developmental progression and expression of heat-shock protein genes in the moth Sesamia nonagrioides. ECOTOXICOLOGY (LONDON, ENGLAND) 2012; 21:2244-2253. [PMID: 22847829 DOI: 10.1007/s10646-012-0980-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 07/17/2012] [Indexed: 06/01/2023]
Abstract
The effects of bisphenol A (BPA) on the endocrine system of vertebrates have been demonstrated in several studies. Here, we report the impact of BPA on the developmental progression and expression of heat shock protein genes on the terrestrial insect Sesamia nonagrioides (Lepidoptera: Noctuidae). S. nonagrioides 1st instar larvae were exposed until the end of 6th (last) instar to selected concentrations of BPA (1 μg/L, 10 μg/L, 100 μg/L, 1 mg/L and 10 mg/L) applied in their artificial diets. The lower doses of BPA (1-10 μg/L) were found to decrease larvae's weight while the 100 μg/L dose increased it. The higher doses of BPA were found to induce various abnormal phenotypes during 5th instar larval molting, larval-pupal transformation and metamorphosis. The developmental and metamorphosis endpoints presented here may indicate the possible impact of BPA on terrestrial insects. Additionally, 6th instar larvae were injected with several concentrations of BPA. Semi-quantitative and Real-Time PCR assays were used to identify the effects of BPA in the transcriptional regulation of five heat shock protein genes (SnoHsp19.5, SnoHsp20.8, SnoHsp70, SnoHsc70 and SnoHsp83). Application of BPA by feeding or by injection induced the synthesis of the SnoHsp19.5 and SnoHsp20.8 mRNAs. The expression levels of SnoHsp70 were not affected. In contrast, SnoHsc70 and SnoHsp83, which play a pivotal role in vertebrate sex steroid signal transduction, were elevated by BPA. Our results suggest that SnoHsp19.5, SnoHsp20.8, SnoHsp83 and SnoHsc70 genes can be modulated by BPA.
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Affiliation(s)
- Xenia Michail
- Department of Agricultural Biotechnology, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece
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Wei T, Sun Y, Shi G, Wang R, Xu T. Characterization and SNP variation analysis of a HSP70 gene from miiuy croaker and its expression as related to bacterial challenge and heat shock. FISH & SHELLFISH IMMUNOLOGY 2012; 33:632-640. [PMID: 22750024 DOI: 10.1016/j.fsi.2012.06.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2012] [Revised: 05/31/2012] [Accepted: 06/15/2012] [Indexed: 06/01/2023]
Abstract
Heat shock proteins (HSPs) play crucial roles in the immune response of vertebrates. In order to study immune defense mechanism of heat shock protein gene in miiuy croaker (Miichthys miiuy), a cDNA encoding heat shock protein 70 (designated Mimi-HSP70) gene was cloned from miiuy croaker. The cDNA was 2195 bp in length, consisting of an open reading frame (ORF) of 1917 bp encoding a polypeptide of 638 amino acids with estimated molecular mass of 70.3 kDa and theoretical isoelectric point of 5.55. Genomic DNA structure analysis revealed that the Mimi-HSP70 gene contain no introns in coding region and four SNPs with 373 C/T, 789 G/A, 1005 C/T, and 1185 G/A were detected by direct sequencing of 20 samples from six different populations. BLAST analysis, structure comparison and phylogenetic analysis indicated that Mimi-HSP70 should be an inducible cytosolic member of the HSP70 family. The deduced amino acid sequence of Mimi-HSP70 had 82.4%-92.2% identity with those of vertebrate. A real-time quantitative RT-PCR demonstrated that the HSP70 gene was ubiquitously expressed in ten normal tissues. Under different temperature shock stress, the expression of Mimi-HSP70 gene in miiuy croaker increased at first and then decreased with the rise of temperature, finally, reached a maximum level in liver, spleen and kidney tissues. Infection of miiuy croaker with Vibrio anguillarum resulted in significant changes expression of Mimi-HSP70 gene in the immune-related tissues. These results indicated that expression analysis of Mimi-HSP70 gene provide theoretical basis to further study the mechanism of anti-adverseness in the miiuy croaker.
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Affiliation(s)
- Tao Wei
- Laboratory for Marine Living Resources and Molecular Engineering, College of Marine Science, Zhejiang Ocean University, Zhoushan, Zhejiang Province 316000, PR China
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Tang T, Wu C, Li J, Ren G, Huang D, Liu F. Stress-induced HSP70 from Musca domestica plays a functionally significant role in the immune system. JOURNAL OF INSECT PHYSIOLOGY 2012; 58:1226-1234. [PMID: 22750549 DOI: 10.1016/j.jinsphys.2012.06.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Revised: 06/13/2012] [Accepted: 06/14/2012] [Indexed: 06/01/2023]
Abstract
As important molecular chaperones, members of the 70kDa heat shock protein (HSP70) family play essential roles in stress tolerance and innate immunity in organisms. The full-length complementary DNA (cDNA) of a novel inducible HSP70, named as MdHSP70, was isolated from Musca domestica. The cDNA clone consisted of 2411 bp with a 1956 bp open reading frame which encodes 651 amino acids. Using real-time quantitative polymerase chain reaction (qPCR), we investigated the transcriptional profile of the gene under heat shock, cadmium stress and in response to bacteria. Increased expression of MdHSP70 was observed in response to both heat shock and Cd stress. The expression of MdHSP70 was significantly induced by Escherichia coli or Staphylococcus aureus stimulation. Larvae were fed bacteria expressing dsRNA targeting the MdHSP70 gene. Our results showed high mortality in larvae treated with dsRNA of MdHSP70 at heat shock, Cd stress and bacterial invasion, suggesting that MdHSP70 is potentially involved in the stress and immune responses of the house fly and perhaps contributes to protection against cellular injury.
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Affiliation(s)
- Ting Tang
- College of Life Sciences, Hebei University, Baoding 071002, China
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Vesala L, Salminen TS, Kankare M, Hoikkala A. Photoperiodic regulation of cold tolerance and expression levels of regucalcin gene in Drosophila montana. JOURNAL OF INSECT PHYSIOLOGY 2012; 58:704-709. [PMID: 22360999 DOI: 10.1016/j.jinsphys.2012.02.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2011] [Revised: 02/10/2012] [Accepted: 02/13/2012] [Indexed: 05/31/2023]
Abstract
Temperature-induced plasticity of cold tolerance has been reported in many insect species, but cold tolerance can also be affected by changes in day (or night) length. In the present study we elucidate the direct and indirect effects of photoperiod on the cold tolerance of females of two Drosophila montana strains--one which possesses a robust photoperiodic diapause and another which does not. In the diapause-strain the time needed for recovery from chill coma showed a positive correlation with day length, but diapause itself played only a minor role in photoperiodic acclimation. The strain that was not able to enter to diapause as a response to day length also lacked photoperiodic cold acclimation ability indicating that this strain has deficiencies in its photoperiodic time measurement system. In the diapause-strain, the expression level of regucalcin gene was more than two times higher in diapausing than in non-diapausing females maintained in a single photoperiod, but day length per se did not cause significant changes in expression levels of this gene in either of the strains. In the non-diapausing strain this gene showed no expression changes in any comparison. Overall, the study shows that a decrease in day length can induce cold acclimation in D. montana, while changes in regucalcin expression are linked with photoperiodic diapause.
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Affiliation(s)
- L Vesala
- Department of Biological and Environmental Science, University of Jyväskylä, FI-40014 Jyväskylä, Finland.
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Levis NA, Yi SX, Lee RE. Mild desiccation rapidly increases freeze tolerance of the goldenrod gall fly, Eurosta solidaginis: evidence for drought-induced RCH. J Exp Biol 2012; 215:3768-73. [DOI: 10.1242/jeb.076885] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Summary
Overwintering insects may experience extreme cold and desiccation stress. Both freezing and desiccation require cells to tolerate osmotic challenge as solutes become concentrated in the hemolymph. Not surprisingly, physiological responses to low temperature and desiccation share common features and may confer cross-tolerance against these stresses. Freeze-tolerant larvae of the goldenrod gall fly, Eurosta solidaginis (Fitch) (Diptera: Tephritidae), experience extremely dry and cold conditions in winter. To determine whether mild desiccation can improve freeze tolerance at organismal and cellular levels, we assessed survival, hemolymph osmolality, and glycerol levels of control and desiccated larvae. Larvae that lost only 6-10% of their body mass, in as little as 6 h, had markedly higher levels of freeze tolerance. Mild, rapid desiccation increased freezing tolerance at -15°C in September- (33.3±6.7 to 73.3±12%) and at -20°C in October-collected (16.7±6.7 to 46.7±3.3%) larvae. Similarly, 6 h of desiccation improved in vivo survival by 17-43% in fat body, Malpighian tubule, salivary gland, and tracheal cells at -20°C. Desiccation, also, enhanced intrinsic levels of cold tolerance in midgut cells frozen ex vivo (38.7±4.6 to 89.2±5.5 %). Whereas hemolymph osmolality increased significantly with desiccation treatment from 544±16 to 720±26 mOsm, glycerol levels did not differ between control and desiccated groups. The rapidity with which a mild desiccation stress increased freeze tolerance closely resembles the rapid cold-hardening (RCH) response, which occurs during brief sub-lethal chilling, and suggests that drought stress can induce RCH.
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Waagner D, Bayley M, Mariën J, Holmstrup M, Ellers J, Roelofs D. Ecological and molecular consequences of prolonged drought and subsequent rehydration in Folsomia candida (Collembola). JOURNAL OF INSECT PHYSIOLOGY 2012; 58:130-137. [PMID: 22079296 DOI: 10.1016/j.jinsphys.2011.10.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2011] [Revised: 10/23/2011] [Accepted: 10/24/2011] [Indexed: 05/31/2023]
Abstract
Drought tolerance in water-permeable, soil-living Collembola (e.g. Folsomia candida) is achieved due to a unique water vapour absorption mechanism, where accumulation of sugars and polyols is essential. However, the molecular mechanisms underlying such adaptation as well as the maintenance of this survival strategy and the responses to rehydration after prolonged drought in these soil-living Collembola are unclear. In the present study, the functional relationships between ecological drought responses and expression of related target genes were investigated in F. candida exposed to mild and severe drought for up to 5 weeks by relating survival, moulting and reproduction rate with mRNA-level expression of 7 target genes during drought, dehydration and rehydration. Prolonged drought and subsequent rehydration induced significant changes in gene expression which could be related to the fitness traits studied. In F. candida the ecological and molecular responses to mild drought differed from those of severe drought. From the changes in gene expression, where significantly increased expression of Glucose-6-phosphate-isomerase (gpi) and Heat shock protein 70 (hsp70) was dominating, it is proposed that protection of cellular structure and function during prolonged mild drought (98.2% RH) is partly achieved from a continuous accumulation of compatible osmolytes in F. candida. To achieve protection during and after prolonged severe drought (96.1% RH), components related to cell division and development such as inositol monophosphatase and one of the small heat shock proteins (sHsps), Heat shock protein23 (hsp23), seem to play an important role in F. candida.
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Affiliation(s)
- Dorthe Waagner
- Department of Bioscience, Aarhus University, Ny Munkegade 116, DK-8000 Aarhus C, Denmark.
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Bubliy OA, Kristensen TN, Kellermann V, Loeschcke V. Plastic responses to four environmental stresses and cross-resistance in a laboratory population ofDrosophila melanogaster. Funct Ecol 2011. [DOI: 10.1111/j.1365-2435.2011.01928.x] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Chown SL, Sørensen JG, Terblanche JS. Water loss in insects: an environmental change perspective. JOURNAL OF INSECT PHYSIOLOGY 2011; 57:1070-84. [PMID: 21640726 DOI: 10.1016/j.jinsphys.2011.05.004] [Citation(s) in RCA: 192] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2011] [Revised: 05/06/2011] [Accepted: 05/06/2011] [Indexed: 05/15/2023]
Abstract
In the context of global environmental change much of the focus has been on changing temperatures. However, patterns of rainfall and water availability have also been changing and are expected to continue doing so. In consequence, understanding the responses of insects to water availability is important, especially because it has a pronounced influence on insect activity, distribution patterns, and species richness. Here we therefore provide a critical review of key questions that either are being or need to be addressed in this field. First, an overview of insect behavioural responses to changing humidity conditions and the mechanisms underlying sensing of humidity variation is provided. The primary sensors in insects belong to the temperature receptor protein superfamily of cation channels. Temperature-activated transient receptor potential ion channels, or thermoTRPs, respond to a diverse range of stimuli and may be a primary integrator of sensory information, such as environmental temperature and moisture. Next we touch briefly on the components of water loss, drawing attention to a new, universal model of the water costs of gas exchange and its implications for responses to a warming, and in places drying, world. We also provide an overview of new understanding of the role of the sub-elytral chamber for water conservation, and developments in understanding of the role of cuticular hydrocarbons in preventing water loss. Because of an increasing focus on the molecular basis of responses to dehydration stress we touch briefly on this area, drawing attention to the role of sugars, heat shock proteins, aquaporins, and LEA proteins. Next we consider phenotypic plasticity or acclimation responses in insect water balance after initial exposures to altered humidity, temperature or nutrition. Although beneficial acclimation has been demonstrated in several instances, this is not always the case. Laboratory studies show that responses to selection for enhanced ability to survive water stress do evolve and that genetic variation for traits underlying such responses does exist in many species. However, in others, especially tropical, typically narrowly distributed species, this appears not to be the case. Using the above information we then demonstrate that habitat alteration, climate change, biological invasions, pollution and overexploitation are likely to be having considerable effects on insect populations mediated through physiological responses (or the lack thereof) to water stress, and that these effects may often be non-intuitive.
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Affiliation(s)
- Steven L Chown
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa.
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Yi SX, Benoit JB, Elnitsky MA, Kaufmann N, Brodsky JL, Zeidel ML, Denlinger DL, Lee RE. Function and immuno-localization of aquaporins in the Antarctic midge Belgica antarctica. JOURNAL OF INSECT PHYSIOLOGY 2011; 57:1096-1105. [PMID: 21315725 PMCID: PMC8875278 DOI: 10.1016/j.jinsphys.2011.02.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Revised: 01/27/2011] [Accepted: 02/03/2011] [Indexed: 05/30/2023]
Abstract
Aquaporin (AQP) water channel proteins play key roles in water movement across cell membranes. Extending previous reports of cryoprotective functions in insects, this study examines roles of AQPs in response to dehydration, rehydration, and freezing, and their distribution in specific tissues of the Antarctic midge, Belgica antarctica (Diptera, Chironomidae). When AQPs were blocked using mercuric chloride, tissue dehydration tolerance increased in response to hypertonic challenge, and susceptibility to overhydration decreased in a hypotonic solution. Blocking AQPs decreased the ability of tissues from the midgut and Malpighian tubules to tolerate freezing, but only minimal changes were noted in cellular viability of the fat body. Immuno-localization revealed that a DRIP-like protein (a Drosophila aquaporin), AQP2- and AQP3 (aquaglyceroporin)-like proteins were present in most larval tissues. DRIP- and AQP2-like proteins were also present in the gut of adult midges, but AQP4-like protein was not detectable in any tissues we examined. Western blotting indicated that larval AQP2-like protein levels were increased in response to dehydration, rehydration and freezing, whereas, in adults DRIP-, AQP2-, and AQP3-like proteins were elevated by dehydration. These results imply a vital role for aquaporin/aquaglyceroporins in water relations and freezing tolerance in B. antarctica.
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Affiliation(s)
| | - Joshua B. Benoit
- Ohio State University, Columbus, OH 43210, USA
- Yale University, New Haven, CT 06510, USA
| | - Michael A. Elnitsky
- Miami University, Oxford, OH 45056, USA
- Mercyhurst College, Erie, PA 16546, USA
| | | | | | - Mark L. Zeidel
- Beth Israel Deaconess Medical Center, Boston, MA 02215, USA
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Gusev O, Cornette R, Kikawada T, Okuda T. Expression of heat shock protein-coding genes associated with anhydrobiosis in an African chironomid Polypedilum vanderplanki. Cell Stress Chaperones 2011; 16:81-90. [PMID: 20809134 PMCID: PMC3024092 DOI: 10.1007/s12192-010-0223-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2010] [Revised: 08/11/2010] [Accepted: 08/13/2010] [Indexed: 12/17/2022] Open
Abstract
In order to survive in extreme environments, organisms need to develop special adaptations both on physiological and molecular levels. The sleeping chironomid Polypedilum vanderplanki, inhabiting temporary water pools in semi-arid regions of Africa, is the only insect to have evolutionarily acquired the ability to withstand prolonged complete desiccation at larval stage, entering a state called anhydrobiosis. Even after years in a dry state, larvae are able to revive within a short period of time, completely restoring metabolism. Because of the possible involvement of stress proteins in the preservation of biomolecules during the anhydrobiosis of the sleeping chironomid, we have analyzed the expression of genes encoding six heat shock proteins (Pv-hsp90, Pv-hsp70, Pv-hsc70, Pv-hsp60, Pv-hsp20, and Pv-p23) and one heat shock factor (Pv-hsf1) in dehydrating, rehydrating, and heat-shocked larvae. All examined genes were significantly up-regulated in the larvae upon dehydration and several patterns of expression were detected. Gene transcript of Pv-hsf1 was up-regulated within 8 h of desiccation, followed by large shock proteins expression reaching peak at 24-48 h of desiccation. Heat-shock-responsive Pv-hsp70 and Pv-hsp60 showed a two-peak expression: in dehydrating and rehydrating larvae. Both small alpha-crystallin heat shock proteins (sHSP) transcripts were accumulated in the desiccated larvae, but showed different expression profiles. Both sHSP-coding genes were found to be heat-inducible, and Pv-hsp20 was up-regulated in the larvae at the early stage of desiccation. In contrast, expression of the second transcript, corresponding to Pv-p23, was limited to the late stages of desiccation, suggesting possible involvement of this protein in the glass-state formation in anhydrobiotic larvae. We discuss possible roles of proteins encoded by these stress genes during the different stages of anhydrobiosis in P. vanderplanki.
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Affiliation(s)
- Oleg Gusev
- Anhydrobiosis Research Unit, National Institute of Agrobiological Sciences, 1-2 Ohwashi, Tsukuba, Ibaraki 305-8634 Japan
| | - Richard Cornette
- Anhydrobiosis Research Unit, National Institute of Agrobiological Sciences, 1-2 Ohwashi, Tsukuba, Ibaraki 305-8634 Japan
| | - Takahiro Kikawada
- Anhydrobiosis Research Unit, National Institute of Agrobiological Sciences, 1-2 Ohwashi, Tsukuba, Ibaraki 305-8634 Japan
| | - Takashi Okuda
- Anhydrobiosis Research Unit, National Institute of Agrobiological Sciences, 1-2 Ohwashi, Tsukuba, Ibaraki 305-8634 Japan
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TANI F, NISHITANI I, YASUMOTO K, KITABATAKE N. Preservative Effect of Polyols on the Stability of Biocatalysts during Short-term Dehydration Stress. FOOD SCIENCE AND TECHNOLOGY RESEARCH 2011. [DOI: 10.3136/fstr.17.385] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Michaud MR, Teets NM, Peyton JT, Blobner BM, Denlinger DL. Heat shock response to hypoxia and its attenuation during recovery in the flesh fly, Sarcophaga crassipalpis. JOURNAL OF INSECT PHYSIOLOGY 2011; 57:203-210. [PMID: 21075112 DOI: 10.1016/j.jinsphys.2010.11.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2010] [Revised: 11/04/2010] [Accepted: 11/05/2010] [Indexed: 05/30/2023]
Abstract
In this study, pharate adults of the flesh fly Sarcophaga crassipalpis were exposed to two, four, seven, or ten days of severe hypoxia (3% oxygen) to evaluate its impact on emergence and the expression of genes encoding heat shock proteins (Hsps) and heat shock regulatory elements. A four-day exposure to hypoxia significantly reduced survival, but more than seven days was required to reach the LD(50). Eight genes encoding Hsps, at least one from each major family of Hsps (Hsp90, Hsp70, Hsp60, Hsp40, and sHsps) and two genes encoding proteins involved in Hsp regulation (heat shock factor, hsf, and sirtuin) were cloned, and expression levels were assessed during and after hypoxia using qRT-PCR. Most, but not all hsps studied, were significantly up-regulated during hypoxia, and expression levels for most of the hsps reverted to control levels a few hours after return to normoxia. Hsp70 was the most responsive to hypoxia, increasing expression several hundred fold. By contrast, hsp90 and hsp27 showed little response to hypoxia but did respond to recovery. Neither hsf nor sirtuin were elevated by hypoxia, an observation consistent with their assumed post-transcriptional regulatory roles. These data demonstrate a strong Hsp response to hypoxia, suggesting an important role for Hsps in responding to low oxygen environments.
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Affiliation(s)
- M Robert Michaud
- Department of Entomology, The Ohio State University, 318 W. 12th Ave., Columbus, OH 43210, USA
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Benoit JB, Patrick KR, Desai K, Hardesty JJ, Krause TB, Denlinger DL. Repeated bouts of dehydration deplete nutrient reserves and reduce egg production in the mosquito Culex pipiens. ACTA ACUST UNITED AC 2010; 213:2763-9. [PMID: 20675546 DOI: 10.1242/jeb.044883] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In this study of the mosquito, Culex pipiens, we examined the impact of multiple bouts of dehydration and rehydration on survival, depletion of metabolic reserves and egg production in both non-diapausing and diapausing females. Mosquitoes provided with access to sugar during rehydration survived longer than those allowed to rehydrate without sugar, and their survival was similar to that of mosquitoes of the same age that were not dehydrated. Among mosquitoes not provided with sugar, each dehydration bout reduced the mosquito's dry mass - an effect likely to be due to the utilization of carbohydrates and lipid reserves. The toll on glycogen and lipid reserves is likely to be especially costly for diapausing mosquitoes that are dependent on these stored reserves for winter survival. Egg production in both non-diapausing and post-diapausing C. pipiens was also reduced in response to multiple bouts of dehydration. Although egg quality was not compromised, the number of eggs produced was reduced. Both non-diapausing and diapausing females can compensate for the nutrient loss due to dehydration by sugar feeding but the opportunity to feed on sugar is likely to be rarely available in the overwintering habitat of diapausing females, thus the impact of dehydration may be especially pronounced in overwintering populations of C. pipiens.
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Affiliation(s)
- Joshua B Benoit
- Department of Entomology, The Ohio State University, Columbus, OH 43210, USA.
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Benoit JB, Denlinger DL. Meeting the challenges of on-host and off-host water balance in blood-feeding arthropods. JOURNAL OF INSECT PHYSIOLOGY 2010; 56:1366-76. [PMID: 20206630 PMCID: PMC2918697 DOI: 10.1016/j.jinsphys.2010.02.014] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2010] [Revised: 02/08/2010] [Accepted: 02/09/2010] [Indexed: 05/26/2023]
Abstract
In this review, we describe water balance requirements of blood-feeding arthropods, particularly contrasting dehydration tolerance during the unfed, off-host state and the challenges of excess water that accompany receipt of the bloodmeal. Most basic water balance characteristics during the off-host stage are applicable to other terrestrial arthropods, as well. A well-coordinated suite of responses enable arthropods to conserve water resources, enhance their desiccation tolerance, and increase their water supplies by employing a diverse array of molecular, structural and behavioral responses. Water loss rates during the off-host phase are particularly useful for generating a scheme to classify vectors according to their habitat requirements for water, thus providing a convenient tool with potential predictive power for defining suitable current and future vector habitats. Blood-feeding elicits an entirely different set of challenges as the vector responds to overhydration by quickly increasing its rate of cuticular water loss and elevating the rate of diuresis to void excess water and condense the bloodmeal. Immature stages that feed on blood normally have a net increase in water content at the end of a blood-feeding cycle, but in adults the water content reverts to the pre-feeding level when the cycle is completed. Common themes are evident in diverse arthropods that feed on blood, particularly the physiological mechanisms used to respond to the sudden influx of water as well as the mechanisms used to counter water shortfalls that are encountered during the non-feeding, off-host state.
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Affiliation(s)
- Joshua B Benoit
- Department of Entomology, Ohio State University, Columbus, OH, United States.
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Mizrahi T, Heller J, Goldenberg S, Arad Z. Heat shock proteins and resistance to desiccation in congeneric land snails. Cell Stress Chaperones 2010; 15:351-63. [PMID: 19953352 PMCID: PMC3082649 DOI: 10.1007/s12192-009-0150-9] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2009] [Revised: 10/01/2009] [Accepted: 10/12/2009] [Indexed: 10/20/2022] Open
Abstract
Land snails are subject to daily and seasonal variations in temperature and in water availability and depend on a range of behavioral and physiological adaptations for coping with problems of maintaining water, ionic, and thermal balance. Heat shock proteins (HSPs) are a multigene family of proteins whose expression is induced by a variety of stress agents. We used experimental desiccation to test whether adaptation to different habitats affects HSP expression in two closely related Sphincterochila snail species, a desiccation-resistant, desert species Sphincterochila zonata, and a Mediterranean-type, desiccation-sensitive species Sphincterochila cariosa. We examined the HSP response in the foot, hepatopancreas, and kidney tissues of snails exposed to normothermic desiccation. Our findings show variations in the HSP response in both timing and magnitude between the two species. The levels of endogenous Hsp72 in S. cariosa were higher in all the examined tissues, and the induction of Hsp72, Hsp74, and Hsp90 developed earlier than in S. zonata. In contrary, the induction of sHSPs (Hsp25 and Hsp30) was more pronounced in S. zonata compared to S. cariosa. Our results suggest that land snails use HSPs as part of their survival strategy during desiccation and as important components of the aestivation mechanism in the transition from activity to dormancy. Our study underscores the distinct strategy of HSP expression in response to desiccation, namely the delayed induction of Hsp70 and Hsp90 together with enhanced induction of sHSPs in the desert-dwelling species, and suggests that evolution in harsh environments will result in selection for reduced Hsp70 expression.
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Affiliation(s)
- Tal Mizrahi
- Department of Biology, Technion, Haifa, 32000 Israel
| | - Joseph Heller
- Department of Evolution, Systematics and Ecology, Hebrew University of Jerusalem, Jerusalem, 91904 Israel
| | | | - Zeev Arad
- Department of Biology, Technion, Haifa, 32000 Israel
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Reuner A, Hengherr S, Mali B, Förster F, Arndt D, Reinhardt R, Dandekar T, Frohme M, Brümmer F, Schill RO. Stress response in tardigrades: differential gene expression of molecular chaperones. Cell Stress Chaperones 2010; 15:423-30. [PMID: 19943197 PMCID: PMC3082643 DOI: 10.1007/s12192-009-0158-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2009] [Revised: 11/02/2009] [Accepted: 11/03/2009] [Indexed: 10/20/2022] Open
Abstract
Semi-terrestrial tardigrades exhibit a remarkable tolerance to desiccation by entering a state called anhydrobiosis. In this state, they show a strong resistance against several kinds of physical extremes. Because of the probable importance of stress proteins during the phases of dehydration and rehydration, the relative abundance of transcripts coding for two alpha-crystallin heat-shock proteins (Mt-sHsp17.2 and Mt-sHsp19.5), as well for the heat-shock proteins Mt-sHsp10, Mt-Hsp60, Mt-Hsp70 and Mt-Hsp90, were analysed in active and anhydrobiotic tardigrades of the species Milnesium tardigradum. They were also analysed in the transitional stage (I) of dehydration, the transitional stage (II) of rehydration and in heat-shocked specimens. A variable pattern of expression was detected, with most candidates being downregulated. Gene transcripts of one Mt-hsp70 isoform in the transitional stage I and Mt-hsp90 in the anhydrobiotic stage were significantly upregulated. A high gene expression (778.6-fold) was found for the small alpha-crystallin heat-shock protein gene Mt-sHsp17.2 after heat shock. We discuss the limited role of the stress-gene expression in the transitional stages between the active and anhydrobiotic tardigrades and other mechanisms which allow tardigrades to survive desiccation.
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Affiliation(s)
- Andy Reuner
- Zoology, Biological Institute, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
| | - Steffen Hengherr
- Zoology, Biological Institute, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
| | - Brahim Mali
- Molecular Biology and Functional Genomics, University of Applied Sciences Wildau, Bahnhofstraße 1, Gebäude 15, 15745 Wildau, Germany
| | - Frank Förster
- Department of Bioinformatics, Biocenter, Am Hubland, University of Würzburg, 97074 Würzburg, Germany
| | - Detlev Arndt
- Developmental Biology Unit, European Molecular Biology Laboratory, 69012 Heidelberg, Germany
| | - Richard Reinhardt
- MPI for Molecular Genetics, Ihnestrasse 63-73, 14195 Berlin-Dahlem, Germany
| | - Thomas Dandekar
- Department of Bioinformatics, Biocenter, Am Hubland, University of Würzburg, 97074 Würzburg, Germany
| | - Marcus Frohme
- Molecular Biology and Functional Genomics, University of Applied Sciences Wildau, Bahnhofstraße 1, Gebäude 15, 15745 Wildau, Germany
| | - Franz Brümmer
- Zoology, Biological Institute, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
| | - Ralph O. Schill
- Zoology, Biological Institute, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
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Benoit JB, Lopez-Martinez G, Phillips ZP, Patrick KR, Denlinger DL. Heat shock proteins contribute to mosquito dehydration tolerance. JOURNAL OF INSECT PHYSIOLOGY 2010; 56:151-156. [PMID: 19782687 PMCID: PMC2861860 DOI: 10.1016/j.jinsphys.2009.09.012] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2009] [Revised: 08/18/2009] [Accepted: 09/18/2009] [Indexed: 05/27/2023]
Abstract
This study examines the responses of heat shock protein transcripts, Hsp70 and Hsp90, to dehydration stress in three mosquito species, Aedes aegypti, Anopheles gambiae and Culex pipiens. We first defined the water balance attributes of adult females of each species, monitored expression of the hsp transcripts in response to dehydration, and then knocked down expression of the transcripts using RNA interference (RNAi) to evaluate potential functions of the Hsps in maintenance of water balance. Fully hydrated females of all three species contained nearly the same amount of water (66-68%), but water loss rates differed among the species, with A. aegypti having the lowest water loss rate (2.6%/h), followed by C. pipiens (3.3%/h), and A. gambiae (5.1%/h). In all three species water could be replaced only by drinking water (or blood). Both A. aegypti and C. pipiens tolerated a loss of 36% of their body water, but A. gambiae was more vulnerable to water loss, tolerating a loss of only 29% of its body water. Dehydration elicited expression of hsp70 in all three species, but only C. pipiens continued to express this transcript during rehydration. Hsp90 was constitutively expressed and expression levels remained fairly constant during dehydration and rehydration, except expression was not noted during rehydration of C. pipiens. Injection of dsRNA to knock down expression of hsp70 (83% reduction) and hsp90 (46% reduction) in A. aegypti did not alter water content or water loss rates, but the dehydration tolerance was lower. Instead of surviving a 36% water loss, females were able to survive only a 28% water loss in response to RNAi directed against hsp70 and a 26% water loss when RNAi was directed against hsp90. These results indicate a critical function for these Hsps in mosquito dehydration tolerance.
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Affiliation(s)
- Joshua B Benoit
- Department of Entomology, The Ohio State University, Columbus, OH 43210, United States.
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Sørensen JG, Heckmann LH, Holmstrup M. Temporal gene expression profiles in a palaearctic springtail as induced by desiccation, cold exposure and during recovery. Funct Ecol 2010. [DOI: 10.1111/j.1365-2435.2010.01687.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Water Management by Dormant Insects: Comparisons Between Dehydration Resistance During Summer Aestivation and Winter Diapause. AESTIVATION 2010; 49:209-29. [DOI: 10.1007/978-3-642-02421-4_10] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
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Benoit JB, Lopez-Martinez G, Teets NM, Phillips SA, Denlinger DL. Responses of the bed bug, Cimex lectularius, to temperature extremes and dehydration: levels of tolerance, rapid cold hardening and expression of heat shock proteins. MEDICAL AND VETERINARY ENTOMOLOGY 2009; 23:418-425. [PMID: 19941608 DOI: 10.1111/j.1365-2915.2009.00832.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This study of the bed bug, Cimex lectularius, examines tolerance of adult females to extremes in temperature and loss of body water. Although the supercooling point (SCP) of the bed bugs was approximately -20 degrees C, all were killed by a direct 1 h exposure to -16 degrees C. Thus, this species cannot tolerate freezing and is killed at temperatures well above its SCP. Neither cold acclimation at 4 degrees C for 2 weeks nor dehydration (15% loss of water content) enhanced cold tolerance. However, bed bugs have the capacity for rapid cold hardening, i.e. a 1-h exposure to 0 degrees C improved their subsequent tolerance of -14 and -16 degrees C. In response to heat stress, fewer than 20% of the bugs survived a 1-h exposure to 46 degrees C, and nearly all were killed at 48 degrees C. Dehydration, heat acclimation at 30 degrees C for 2 weeks and rapid heat hardening at 37 degrees C for 1 h all failed to improve heat tolerance. Expression of the mRNAs encoding two heat shock proteins (Hsps), Hsp70 and Hsp90, was elevated in response to heat stress, cold stress and during dehydration and rehydration. The response of Hsp90 was more pronounced than that of Hsp70 during dehydration and rehydration. Our results define the tolerance limits for bed bugs to these commonly encountered stresses of temperature and low humidity and indicate a role for Hsps in responding to these stresses.
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Affiliation(s)
- J B Benoit
- Department of Entomology, The Ohio State University, Columbus, Ohio 43210, USA.
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50
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Timmermans MJTN, Roelofs D, Nota B, Ylstra B, Holmstrup M. Sugar sweet springtails: on the transcriptional response of Folsomia candida (Collembola) to desiccation stress. INSECT MOLECULAR BIOLOGY 2009; 18:737-46. [PMID: 19788701 DOI: 10.1111/j.1365-2583.2009.00916.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Several species of Collembola survive stressful desiccating conditions by absorbing water vapour from the environment. To obtain insight into the transcriptomic responses underlying this 'water vapour absorption' mechanism we subjected Folsomia candida (Collembola) to transcriptome profiling. We show that ecologically relevant desiccation stress leads to strong time-dependent transcriptomic changes. Exposure of F. candida to 98.2% relative humidity over an interval of 174 h resulted in a high number of gene transcripts being differentially expressed (up to 41%; P-value < 0.05). Additional Gene Ontology analyses suggest that carbohydrate transport, sugar catabolism and cuticle maintenance are biological processes involved in combating desiccation. However, many additional pathways seem to be affected; additional experiments are needed to elucidate which responses are primarily linked to desiccation resistance.
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Affiliation(s)
- M J T N Timmermans
- Department of Animal Ecology, VU University Amsterdam, Amsterdam, the Netherlands
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