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Li Y, Ren K, Hu M, He X, Gu K, Hu B, Su J, Jin Y, Gao W, Yang D, Li F, Zou C. Cold stress in the harvest period: effects on tobacco leaf quality and curing characteristics. BMC Plant Biol 2021; 21:131. [PMID: 33685400 PMCID: PMC7941949 DOI: 10.1186/s12870-021-02895-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 02/18/2021] [Indexed: 05/23/2023]
Abstract
BACKGROUND Weather change in high-altitude areas subjects mature tobacco (Nicotiana tabacum L.) to cold stress, which damages tobacco leaf yield and quality. A brupt diurnal temperature differences (the daily temperature dropping more than 20 °C) along with rainfall in tobacco-growing areas at an altitude above 2450 m, caused cold stress to field-grown tobacco. RESULTS After the flue-cured tobacco suffered cold stress in the field, the surface color of tobacco leaves changed and obvious large browning areas were appeared, and the curing availability was extremely poor. Further research found the quality of fresh tobacco leaves, the content of key chemical components, and the production quality were greatly reduced by cold stress. We hypothesize that cold stress in high altitude environments destroyed the antioxidant enzyme system of mature flue-cured tobacco. Therefore, the quality of fresh tobacco leaves, the content of key chemical components, and the production quality were greatly reduced by cold stress. CONCLUSION This study confirmed that cold stress in high-altitude tobacco areas was the main reason for the browning of tobacco leaves during the tobacco curing process. This adverse environment seriously damaged the quality of tobacco leaves, but can be mitigated by pay attention to the weather forecast and pick tobacco leaves in advance.
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Affiliation(s)
- Yan Li
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, People's Republic of China
| | - Ke Ren
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, People's Republic of China
| | - Mengyang Hu
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, People's Republic of China
| | - Xian He
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, People's Republic of China
| | - Kaiyuan Gu
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, People's Republic of China
| | - Binbin Hu
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, People's Republic of China
| | - Jiaen Su
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, People's Republic of China
| | - Yan Jin
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, People's Republic of China
| | - Wenyou Gao
- Dali Tobacco Monopoly Bureau of Yunnan Province, Dali, Yunnan, People's Republic of China
| | - Daosheng Yang
- Dali Tobacco Monopoly Bureau of Yunnan Province, Dali, Yunnan, People's Republic of China
| | - Folin Li
- College of Tobacco Science, Yunnan Agricultural University, Kunming, Yunnan, People's Republic of China.
| | - Congming Zou
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, People's Republic of China.
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Gai WX, Ma X, Li Y, Xiao JJ, Khan A, Li QH, Gong ZH. CaHsfA1d Improves Plant Thermotolerance via Regulating the Expression of Stress- and Antioxidant-Related Genes. Int J Mol Sci 2020; 21:E8374. [PMID: 33171626 PMCID: PMC7672572 DOI: 10.3390/ijms21218374] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 11/04/2020] [Accepted: 11/05/2020] [Indexed: 12/16/2022] Open
Abstract
Heat shock transcription factor (Hsf) plays an important role in regulating plant thermotolerance. The function and regulatory mechanism of CaHsfA1d in heat stress tolerance of pepper have not been reported yet. In this study, phylogenetic tree and sequence analyses confirmed that CaHsfA1d is a class A Hsf. CaHsfA1d harbored transcriptional function and predicted the aromatic, hydrophobic, and acidic (AHA) motif mediated function of CaHsfA1d as a transcription activator. Subcellular localization assay showed that CaHsfA1d protein is localized in the nucleus. The CaHsfA1d was transcriptionally up-regulated at high temperatures and its expression in the thermotolerant pepper line R9 was more sensitive than that in thermosensitive pepper line B6. The function of CaHsfA1d under heat stress was characterized in CaHsfA1d-silenced pepper plants and CaHsfA1d-overexpression Arabidopsis plants. Silencing of the CaHsfA1d reduced the thermotolerance of the pepper, while CaHsfA1d-overexpression Arabidopsis plants exhibited an increased insensitivity to high temperatures. Moreover, the CaHsfA1d maintained the H2O2 dynamic balance under heat stress and increased the expression of Hsfs, Hsps (heat shock protein), and antioxidant gene AtGSTU5 (glutathione S-transferase class tau 5) in transgenic lines. Our findings clearly indicate that CaHsfA1d improved the plant thermotolerance via regulating the expression of stress- and antioxidant-related genes.
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Affiliation(s)
- Wen-Xian Gai
- College of Horticulture, Northwest A&F University, Yangling 712100, China; (W.-X.G.); (X.M.); (Y.L.); (J.-J.X.)
| | - Xiao Ma
- College of Horticulture, Northwest A&F University, Yangling 712100, China; (W.-X.G.); (X.M.); (Y.L.); (J.-J.X.)
| | - Yang Li
- College of Horticulture, Northwest A&F University, Yangling 712100, China; (W.-X.G.); (X.M.); (Y.L.); (J.-J.X.)
| | - Jing-Jing Xiao
- College of Horticulture, Northwest A&F University, Yangling 712100, China; (W.-X.G.); (X.M.); (Y.L.); (J.-J.X.)
| | - Abid Khan
- Department of Horticulture, The University of Haripur, Haripur 22620, Pakistan;
| | - Quan-Hui Li
- College of Horticulture, Northwest A&F University, Yangling 712100, China; (W.-X.G.); (X.M.); (Y.L.); (J.-J.X.)
- Academy of Agricultural and Forestry Sciences, Qinghai University, Xining 810016, China
| | - Zhen-Hui Gong
- College of Horticulture, Northwest A&F University, Yangling 712100, China; (W.-X.G.); (X.M.); (Y.L.); (J.-J.X.)
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Shen C, Yuan J. Genome-wide characterization and expression analysis of the heat shock transcription factor family in pumpkin (Cucurbita moschata). BMC Plant Biol 2020; 20:471. [PMID: 33054710 PMCID: PMC7557022 DOI: 10.1186/s12870-020-02683-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Accepted: 10/01/2020] [Indexed: 05/02/2023]
Abstract
BACKGROUND Crop quality and yield are affected by abiotic and biotic stresses, and heat shock transcription factors (Hsfs) are considered to play important roles in regulating plant tolerance under various stresses. To investigate the response of Cucurbita moschata to abiotic stress, we analyzed the genome of C. moschata. RESULTS In this research, a total of 36 C. moschata Hsf (CmHsf) members were identified and classified into three subfamilies (I, II, and III) according to their amino acid sequence identity. The Hsfs of the same subfamily usually exhibit a similar gene structure (intron-exon distribution) and conserved domains (DNA-binding and other functional domains). Chromosome localization analysis showed that the 36 CmHsfs were unevenly distributed on 18 of the 21 chromosomes (except for Cm_Chr00, Cm_Chr08 and Cm_Chr20), among which 18 genes formed 9 duplicated gene pairs that have undergone segmental duplication events. The Ka/Ks ratio showed that the duplicated CmHsfs have mainly experienced strong purifying selection. High-level synteny was observed between C. moschata and other Cucurbitaceae species. CONCLUSIONS The expression profile of CmHsfs in the roots, stems, cotyledons and true leaves revealed that the CmHsfs exhibit tissue specificity. The analysis of cis-acting elements and quantitative real-time polymerase chain reaction (qRT-PCR) revealed that some key CmHsfs were activated by cold stress, heat stress, hormones and salicylic acid. This study lays the foundation for revealing the role of CmHsfs in resistance to various stresses, which is of great significance for the selection of stress-tolerant C. moschata.
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Affiliation(s)
- Changwei Shen
- School of Resources and Environmental Sciences, Henan Institute of Science and Technology, Xinxiang, 453003, China
| | - Jingping Yuan
- School of Horticulture and Landscape Architecture, Henan Institute of Science and Technology, Xinxiang, 453003, Henan, China.
- Henan Province Engineering Research Center of Horticultural Plant Resource Utilization and Germplasm Enhancement, Xinxiang, 453003, China.
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Zinsmeister J, Berriri S, Basso DP, Ly-Vu B, Dang TT, Lalanne D, da Silva EAA, Leprince O, Buitink J. The seed-specific heat shock factor A9 regulates the depth of dormancy in Medicago truncatula seeds via ABA signalling. Plant Cell Environ 2020; 43:2508-2522. [PMID: 32683703 DOI: 10.1111/pce.13853] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 07/10/2020] [Accepted: 07/11/2020] [Indexed: 05/15/2023]
Abstract
During the later stages of seed maturation, two key adaptive traits are acquired that contribute to seed lifespan and dispersal, longevity and dormancy. The seed-specific heat shock transcription factor A9 is an important hub gene in the transcriptional network of late seed maturation. Here, we demonstrate that HSFA9 plays a role in thermotolerance rather than in ex situ seed conservation. Storage of hsfa9 seeds of Medicago truncatula and Arabidopsis had comparable lifespan at moderate storage relative humidity (RH), whereas at high RH, hsfa9 seeds lost their viability much faster than wild type seeds. Furthermore, we show that in M. truncatula, Mthsfa9 seeds acquired more dormancy during late maturation than wild type. Transient expression of MtHSFA9 in hairy roots and transcriptome analysis of Mthsfa9 Tnt1 insertion mutants identified a deregulation of genes involved in ABA biosynthesis, catabolism and signalling. Consistent with these results, Mthsfa9 seeds exhibited increased ABA levels and higher sensitivity to ABA. These data suggest that in legumes, HSFA9 acts as a negative regulator of the depth of seed dormancy during seed development via the modulation of hormonal balance.
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Affiliation(s)
- Julia Zinsmeister
- IRHS-UMR1345, Université d'Angers, INRAE, Institut Agro, SFR 4207 QuaSaV, Beaucouzé, France
| | - Souha Berriri
- IRHS-UMR1345, Université d'Angers, INRAE, Institut Agro, SFR 4207 QuaSaV, Beaucouzé, France
| | - Denise Puntel Basso
- IRHS-UMR1345, Université d'Angers, INRAE, Institut Agro, SFR 4207 QuaSaV, Beaucouzé, France
- Departamento de Produção Vegetal, Faculdade de Ciências Agronômicas, Universidade Estadual Paulista, Botucatu, Brazil
| | - Benoit Ly-Vu
- IRHS-UMR1345, Université d'Angers, INRAE, Institut Agro, SFR 4207 QuaSaV, Beaucouzé, France
| | - Thi-Thu Dang
- IRHS-UMR1345, Université d'Angers, INRAE, Institut Agro, SFR 4207 QuaSaV, Beaucouzé, France
| | - David Lalanne
- IRHS-UMR1345, Université d'Angers, INRAE, Institut Agro, SFR 4207 QuaSaV, Beaucouzé, France
| | | | - Olivier Leprince
- IRHS-UMR1345, Université d'Angers, INRAE, Institut Agro, SFR 4207 QuaSaV, Beaucouzé, France
| | - Julia Buitink
- IRHS-UMR1345, Université d'Angers, INRAE, Institut Agro, SFR 4207 QuaSaV, Beaucouzé, France
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Das S, Ooi FK, Cruz Corchado J, Fuller LC, Weiner JA, Prahlad V. Serotonin signaling by maternal neurons upon stress ensures progeny survival. eLife 2020; 9:e55246. [PMID: 32324136 PMCID: PMC7237211 DOI: 10.7554/elife.55246] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 04/22/2020] [Indexed: 01/03/2023] Open
Abstract
Germ cells are vulnerable to stress. Therefore, how organisms protect their future progeny from damage in a fluctuating environment is a fundamental question in biology. We show that in Caenorhabditis elegans, serotonin released by maternal neurons during stress ensures the viability and stress resilience of future offspring. Serotonin acts through a signal transduction pathway conserved between C. elegans and mammalian cells to enable the transcription factor HSF1 to alter chromatin in soon-to-be fertilized germ cells by recruiting the histone chaperone FACT, displacing histones, and initiating protective gene expression. Without serotonin release by maternal neurons, FACT is not recruited by HSF1 in germ cells, transcription occurs but is delayed, and progeny of stressed C. elegans mothers fail to complete development. These studies uncover a novel mechanism by which stress sensing by neurons is coupled to transcription response times of germ cells to protect future offspring.
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Affiliation(s)
- Srijit Das
- Department of Biology, Aging Mind and Brain InitiativeIowa CityUnited States
| | - Felicia K Ooi
- Department of Biology, Aging Mind and Brain InitiativeIowa CityUnited States
| | | | | | - Joshua A Weiner
- Department of BiologyIowa CityUnited States
- Iowa Neuroscience InstituteIowa CityUnited States
| | - Veena Prahlad
- Department of Biology, Aging Mind and Brain InitiativeIowa CityUnited States
- Department of BiologyIowa CityUnited States
- Iowa Neuroscience InstituteIowa CityUnited States
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Li GL, Zhang HN, Shao H, Wang GY, Zhang YY, Zhang YJ, Zhao LN, Guo XL, Sheteiwy MS. ZmHsf05, a new heat shock transcription factor from Zea mays L. improves thermotolerance in Arabidopsis thaliana and rescues thermotolerance defects of the athsfa2 mutant. Plant Sci 2019; 283:375-384. [PMID: 31128708 DOI: 10.1016/j.plantsci.2019.03.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 03/07/2019] [Accepted: 03/08/2019] [Indexed: 05/05/2023]
Abstract
High temperature directly affects the yield and quality of crops. Plant Hsfs play vital roles in plant response to heat shock. In the present study, ZmHsf05 was isolated from maize (Zea mays L.) using homologous cloning methods. The sequencing analysis demonstrated that CDS of ZmHsf05 was 1080 bp length and encoded a protein containing 359 amino acids. The putative amino acid sequence of ZmHsf05 contained typical Hsf domains, such as DBD, OD, NLS and AHA motif. Subcellular localization assays displayed that the ZmHsf05 is localized to the nucleus. ZmHsf05 was expressed in many maize tissues and its expression level was increased by heat stress treatment. ZmHsf05 rescued the reduced thermotolerance of the athsfa2 mutant in Arabidopsis seedlings. Arabidopsis seedlings of ZmHsf05-overexpressing increased both the basal and acquired thermotolerances. After heat stress, the ZmHsf05-overexpressing lines showed enhanced survival rate and chlorophyll content compared with WT seedlings. The expression of Hsps was up-regulated in the ZmHsf05-overexpressing Arabidopsis lines after heat stress treatment. These results suggested that ZmHsf05 plays an important role in both basal and acquired thermotolerance in plants.
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Affiliation(s)
- Guo-Liang Li
- Plant Genetic Engineering Center of Hebei Province/Institute of Genetics and Physiology, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050051, PR China
| | - Hua-Ning Zhang
- Plant Genetic Engineering Center of Hebei Province/Institute of Genetics and Physiology, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050051, PR China
| | - Hongbo Shao
- Salt-soil Agricultural Center, Key Laboratory of Agricultural Environment in the Lower Reaches of Yangtze River Plain, Institute of Agriculture Resources and Environment, Jiangsu Academy of Agriculture Science(JAAS), Nanjing, 210014, PR China; College of Environment and Safety Engineering, Qingdao University of Science & Technology, Qingdao 266000, China; Jiangsu Key Laboratory for Bioresources of Saline Soils, Jiangsu Synthetic Innovation Center for Coastal Bio-agriculture, Yancheng Teachers University, Yancheng, 224002, PR China.
| | - Gui-Yan Wang
- Faculty of Agronomy, Hebei Agricultural University, Baoding, 071001, PR China.
| | - Yuan-Yuan Zhang
- Plant Genetic Engineering Center of Hebei Province/Institute of Genetics and Physiology, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050051, PR China; College of Life Science, Hebei Normal University, Shijiazhuang 050024, PR China
| | - Yu-Jie Zhang
- Plant Genetic Engineering Center of Hebei Province/Institute of Genetics and Physiology, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050051, PR China; College of Agriculture and Forestry Science and Technology, Hebei North University, Zhangjiakou, 075000, PR China
| | - Li-Na Zhao
- Plant Genetic Engineering Center of Hebei Province/Institute of Genetics and Physiology, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050051, PR China; Faculty of Agronomy, Hebei Agricultural University, Baoding, 071001, PR China
| | - Xiu-Lin Guo
- Plant Genetic Engineering Center of Hebei Province/Institute of Genetics and Physiology, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050051, PR China.
| | - Mohamed Salah Sheteiwy
- Salt-soil Agricultural Center, Key Laboratory of Agricultural Environment in the Lower Reaches of Yangtze River Plain, Institute of Agriculture Resources and Environment, Jiangsu Academy of Agriculture Science(JAAS), Nanjing, 210014, PR China
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Singh G, Sarkar NK, Grover A. Mapping of domains of heat stress transcription factor OsHsfA6a responsible for its transactivation activity. Plant Sci 2018; 274:80-90. [PMID: 30080644 DOI: 10.1016/j.plantsci.2018.05.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2018] [Revised: 05/10/2018] [Accepted: 05/14/2018] [Indexed: 06/08/2023]
Abstract
Elevated temperatures affect the growth and reproduction of crop plants and thus have become concern worldwide. Hsp101/ClpB protein is a major molecular chaperone, performing dis-aggregation of protein aggregates formed during heat stress. In rice, OsHsfA6a binds to the promoter of OsHsp101/ClpB-C and regulates its expression. In this study, analysis of C-terminal domains of ClassA OsHsfs revealed the presence of aromatic, hydrophobic, acidic (AHA) and nuclear export signal (NES) motifs in all the members. Using deletion constructs, we show that the activation potential of OsHsfA6a is confined in the C-terminal activation domain comprising of AHA and NES sequences. The results obtained in yeast were complemented with transient expression of reporter in protoplast (TERP) based assay. Detailed analysis of OsHsfA6a splice variants shows the presence of one full version and a DBD truncated smaller version whose existence needs experimental evidences. Phylogeny analysis revealed that OsHsfA6a has diverged from A6a/A6b forms of Arabidopsis and tomato and has no expressologs. OsHsfA6a in-silico network was enriched in MAP kinases along with Hsp70 and Hsp90 proteins. Thus, it appears that regulation of OsClpB-C by HsfA6a is unique in rice and activation potential of OsHsfA6a resides in the single AHA motif located in the C-terminal domain.
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Affiliation(s)
- Garima Singh
- Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi 110021, India
| | - Neelam K Sarkar
- Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi 110021, India
| | - Anil Grover
- Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi 110021, India.
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Li F, Zhang H, Zhao H, Gao T, Song A, Jiang J, Chen F, Chen S. Chrysanthemum CmHSFA4 gene positively regulates salt stress tolerance in transgenic chrysanthemum. Plant Biotechnol J 2018; 16:1311-1321. [PMID: 29230937 PMCID: PMC5999316 DOI: 10.1111/pbi.12871] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 11/25/2017] [Accepted: 12/05/2017] [Indexed: 05/18/2023]
Abstract
Salinity-induced Na+ toxicity and oxidative stress hamper plant growth. Here, we showed that expression of the chrysanthemum CmHSFA4, a homologue of the heat-shock factor AtHSFA4a, is inducible by salt and localizes to the nucleus. It is a transcription activator binding with HSE. Chrysanthemum overexpressing CmHSFA4 displayed enhanced salinity tolerance by limiting Na+ accumulation while maintaining K+ concentration, which is consistent with the up-regulation of ion transporters CmSOS1 and CmHKT2. Additionally, the transgenic plants reduced H2 O2 and O2∙- accumulation under salinity, which could be due to up-regulation of ROS scavenger activities such as SOD, APX and CAT as well as CmHSP70, CmHSP90. Together, these results suggest that CmHSFA4 conferred salinity tolerance in chrysanthemum as a consequence of Na+ /K+ ion and ROS homeostasis.
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Affiliation(s)
- Fei Li
- College of HorticultureNanjing Agricultural UniversityNanjingChina
| | - Huanru Zhang
- College of HorticultureNanjing Agricultural UniversityNanjingChina
| | - Husheng Zhao
- College of HorticultureNanjing Agricultural UniversityNanjingChina
| | - Tianwei Gao
- College of HorticultureNanjing Agricultural UniversityNanjingChina
| | - Aiping Song
- College of HorticultureNanjing Agricultural UniversityNanjingChina
| | - Jiafu Jiang
- College of HorticultureNanjing Agricultural UniversityNanjingChina
| | - Fadi Chen
- College of HorticultureNanjing Agricultural UniversityNanjingChina
| | - Sumei Chen
- College of HorticultureNanjing Agricultural UniversityNanjingChina
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Šimončík O, Pastorek M, Vojtěšek B, Müller P. The Role of HSF1 Protein in Malignant Transformation. Klin Onkol 2018; 31:55-62. [PMID: 31023025 DOI: 10.14735/amko20182s55] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND The heat shock transcription factor, HSF1, is the main regulator of the proteotoxic stress response that orchestrates the adaptation of cells to stress conditions such as elevated temperature, oxidative stress, and proteotoxic stress. As such, HSF1 regulates a large number of stress response-related genes, primarily those encoding heat shock proteins (HSPs). HSPs are molecular chaperones involved in the acquisition of native protein conformations and the prevention of protein degradation, and they also contribute to the removal of denatured proteins via the proteasome. Representative members of the HSP family are HSP70 and HSP90. The stress response is a highly conserved mechanism across all eukaryotes, and HSF1 has been linked to a number of physiological processes (ribosomal biogenesis, translation, transcription, cell cycle, and metabolism) and pathological disorders (neurodegenerative disorders such as Parkinson´s and Alzheimer´s diseases). HSF1 activation is also prominent in different types of cancer (prostate, breast, colorectal carcinoma etc.) where it correlates with tumor aggressiveness and poor prognosis. HSF1 is therefore considered a diagnostic and prognostic marker and is currently being targeted to develop new cancer therapies. Several inhibitors of HSF1 have already been synthesized, but their molecular mechanism (s) of action, specificity those of HSF1, nontoxicity in healthy tissues, and their efficacy in targeting tumor cells remain to be elucidated. PURPOSE This review summarizes known mechanisms of HSF1 regulation and activation, the role of HSF1 during malignant transformation, and the potential of designing small molecule HSF1 inhibitors for cancer therapy. Key words: HSF1 transcription factor - molecular chaperones - cellular stress - tumor transformation - cancer This work was supported by the project MEYS - NPS I - LO1413. The authors declare they have no potential conflicts of interest concerning drugs, products, or services used in the study. The Editorial Board declares that the manuscript met the ICMJE recommendation for biomedical papers. Accepted: 10. 8. 2018.
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Koskas S, Decottignies A, Dufour S, Pezet M, Verdel A, Vourc’h C, Faure V. Heat shock factor 1 promotes TERRA transcription and telomere protection upon heat stress. Nucleic Acids Res 2017; 45:6321-6333. [PMID: 28369628 PMCID: PMC5499866 DOI: 10.1093/nar/gkx208] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 03/16/2017] [Accepted: 03/20/2017] [Indexed: 11/13/2022] Open
Abstract
In response to metabolic or environmental stress, cells activate powerful defense mechanisms to prevent the formation and accumulation of toxic protein aggregates. The main orchestrator of this cellular response is HSF1 (heat shock factor 1), a transcription factor involved in the up-regulation of protein-coding genes with protective roles. It has become very clear that HSF1 has a broader function than initially expected. Indeed, our previous work demonstrated that, upon stress, HSF1 activates the transcription of a non-coding RNA, named Satellite III, at pericentromeric heterochromatin. Here, we observe that the function of HSF1 extends to telomeres and identify subtelomeric DNA as a new genomic target of HSF1. We show that the binding of HSF1 to subtelomeric regions plays an essential role in the upregulation of non-coding TElomeric Repeat containing RNA (TERRA) transcription upon heat shock. Importantly, our data show that telomere integrity is impacted by heat shock and that telomeric DNA damages are markedly enhanced in HSF1 deficient cells. Altogether, our findings reveal a new direct and essential function of HSF1 in the transcriptional activation of TERRA and in telomere protection upon stress.
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Affiliation(s)
- Sivan Koskas
- University Grenoble Alpes, INSERM U1209, CNRS UMR 5309, Institute for Advanced Biosciences, 38042 Grenoble Cedex 9, France
| | | | - Solenne Dufour
- University Grenoble Alpes, INSERM U1209, CNRS UMR 5309, Institute for Advanced Biosciences, 38042 Grenoble Cedex 9, France
| | - Mylène Pezet
- University Grenoble Alpes, INSERM U1209, CNRS UMR 5309, Institute for Advanced Biosciences, 38042 Grenoble Cedex 9, France
| | - André Verdel
- University Grenoble Alpes, INSERM U1209, CNRS UMR 5309, Institute for Advanced Biosciences, 38042 Grenoble Cedex 9, France
| | - Claire Vourc’h
- University Grenoble Alpes, INSERM U1209, CNRS UMR 5309, Institute for Advanced Biosciences, 38042 Grenoble Cedex 9, France
| | - Virginie Faure
- University Grenoble Alpes, INSERM U1209, CNRS UMR 5309, Institute for Advanced Biosciences, 38042 Grenoble Cedex 9, France
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