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Prasanna JA, Mandal VK, Kumar D, Chakraborty N, Raghuram N. Nitrate-responsive transcriptome analysis of rice RGA1 mutant reveals the role of G-protein alpha subunit in negative regulation of nitrogen-sensitivity and use efficiency. Plant Cell Rep 2023; 42:1987-2010. [PMID: 37874341 DOI: 10.1007/s00299-023-03078-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 07/30/2023] [Accepted: 09/19/2023] [Indexed: 10/25/2023]
Abstract
KEY MESSAGE Nitrate-responsive transcriptomic, phenotypic and physiological analyses of rice RGA1 mutant revealed many novel RGA1-regulated genes/processes/traits related to nitrogen use efficiency, and provided robust genetic evidence of RGA1-regulation of NUE. Nitrogen (N) use efficiency (NUE) is important for sustainable agriculture. G-protein signalling was implicated in N-response/NUE in rice, but needed firm genetic characterization of the role of alpha subunit (RGA1). The knock-out mutant of RGA1 in japonica rice exhibited lesser nitrate-dose sensitivity than the wild type (WT), in yield and NUE. We, therefore, investigated its genomewide nitrate-response relative to WT. It revealed 3416 differentially expressed genes (DEGs), including 719 associated with development, grain yield and phenotypic traits for NUE. The upregulated DEGs were related to photosynthesis, chlorophyll, tetrapyrrole and porphyrin biosynthesis, while the downregulated DEGs belonged to cellular protein metabolism and transport, small GTPase signalling, cell redox homeostasis, etc. We validated 26 nitrate-responsive DEGs across functional categories by RT-qPCR. Physiological validation of nitrate-response in the mutant and the WT at 1.5 and 15 mM doses revealed higher chlorophyll and stomatal length but decreased stomatal density, conductance and transpiration. The consequent increase in photosynthesis and water use efficiency may have contributed to better yield and NUE in the mutant, whereas the WT was N-dose sensitive. The mutant was not as N-dose-responsive as the WT in shoot/root growth, productive tillers and heading date, but equally responsive as WT in total N and protein content. The RGA1 mutant was less impacted by higher N-dose or salt stress in terms of yield, protein content, photosynthetic performance, relative water content, water use efficiency and catalase activity. PPI network analyses revealed known NUE-related proteins as RGA1 interactors. Therefore, RGA1 negatively regulates N-dose sensitivity and NUE in rice.
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Affiliation(s)
- Jangam Annie Prasanna
- Centre for Sustainable Nitrogen and Nutrient Management, School of Biotechnology, Guru Gobind Singh Indraprastha University, Sector 16C, Dwarka, New Delhi, 110078, India
| | - Vikas Kumar Mandal
- Centre for Sustainable Nitrogen and Nutrient Management, School of Biotechnology, Guru Gobind Singh Indraprastha University, Sector 16C, Dwarka, New Delhi, 110078, India
- Prof. H.S. Srivastava Foundation for Science and Society, 10B/7, Madan Mohan Malviya Marg, Lucknow, India
| | - Dinesh Kumar
- Division of Agronomy, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi, India
| | - Navjyoti Chakraborty
- Centre for Sustainable Nitrogen and Nutrient Management, School of Biotechnology, Guru Gobind Singh Indraprastha University, Sector 16C, Dwarka, New Delhi, 110078, India.
| | - Nandula Raghuram
- Centre for Sustainable Nitrogen and Nutrient Management, School of Biotechnology, Guru Gobind Singh Indraprastha University, Sector 16C, Dwarka, New Delhi, 110078, India.
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Awasthi JP, Chandra T, Mishra S, Parmar S, Shaw BP, Nilawe PD, Chauhan NK, Sahoo S, Panda SK. Identification and characterization of drought responsive miRNAs in a drought tolerant upland rice cultivar KMJ 1-12-3. Plant Physiol Biochem 2019; 137:62-74. [PMID: 30738218 DOI: 10.1016/j.plaphy.2019.01.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 08/29/2018] [Revised: 01/29/2019] [Accepted: 01/29/2019] [Indexed: 06/09/2023]
Abstract
Shortfall of rain that creates drought like situation in non-irrigated agriculture system often limits rice production, necessitating introduction of drought tolerance trait into the cultivar of interest. The mechanism governing drought tolerance is, however, largely unknown, particularly the involvement of miRNAs, the master regulators of biochemical events. In this regard, response study on a drought tolerant rice variety KMJ 1-12-3 to 20% PEG (osmolality- 315 mOsm/kg) as drought stress revealed significant changes in abundance of several conserved miRNAs targeting transcription factors like homeodomain-leucine zipper, MADS box family protein, C2H2 zinc finger protein and Myb, well known for their importance in drought tolerance in plants. The response study also revealed significant PEG-induced decrease in abundance of the miRNAs targeting cyclin A, cyclin-dependent kinase, guanine nucleotide exchange factor, GTPase-activating protein, 1-aminocyclopropane-1-carboxylic acid oxidase and indole-3-acetic beta-glucosyl transferase indicating miRNA-regulated role of the cell cycle regulators, G-protein signalling and the plant hormones ethylene and IAA in drought tolerance in plants. The study confirmed the existence of four novel miRNAs, including osa-miR12470, osa-miR12471, osa-miR12472 and osa-miR12473, and the targets of three of them could be successfully validated. The PEG-induced decrease in abundance of the novel miRNAs osa-miR12470 and osa-miR12473 targeting RNA dependent RNA polymerase and equilibrative nucleoside transporter, respectively suggested an overall increase in both degradation and synthesis of nucleic acids in plants challenged with drought stress. The drought-responsive miRNAs identified in the study may be proved useful in introducing the trait in the rice cultivars of choice by manipulation of their cellular abundance.
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Affiliation(s)
- Jay Prakash Awasthi
- Department of Life Science and Bioinformatics, Assam University, Silchar, 788011, Assam, India.
| | - Tilak Chandra
- Environmental Biotechnology Laboratory, Institute of Life Sciences, Nalco Square, Bhubaneswar, 751023, Odisha, India.
| | - Sagarika Mishra
- Environmental Biotechnology Laboratory, Institute of Life Sciences, Nalco Square, Bhubaneswar, 751023, Odisha, India.
| | - Shaifaly Parmar
- Environmental Biotechnology Laboratory, Institute of Life Sciences, Nalco Square, Bhubaneswar, 751023, Odisha, India.
| | - Birendra Prasad Shaw
- Environmental Biotechnology Laboratory, Institute of Life Sciences, Nalco Square, Bhubaneswar, 751023, Odisha, India.
| | - Pravin Daulat Nilawe
- Thermo Fisher Scientific India Pvt. Ltd, 403/404 B-Wing, Delphi, Hiranandani Business Park, Powai, Mumbai, 400076, India.
| | - Neeraj Kumar Chauhan
- Thermo Fisher Scientific India Pvt. Ltd, 403/404 B-Wing, Delphi, Hiranandani Business Park, Powai, Mumbai, 400076, India.
| | - Smita Sahoo
- Department of Life Science and Bioinformatics, Assam University, Silchar, 788011, Assam, India.
| | - Sanjib Kumar Panda
- Department of Life Science and Bioinformatics, Assam University, Silchar, 788011, Assam, India.
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Ellery J, Dickson L, Cheung T, Ciuclan L, Bunyard P, Mack S, Buffham WJ, Farnaby W, Mitchell P, Brown D, Isaacs R, Barnes M. Identification of compounds acting as negative allosteric modulators of the LPA 1 receptor. Eur J Pharmacol 2018; 833:8-15. [PMID: 29807028 DOI: 10.1016/j.ejphar.2018.05.040] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 05/24/2018] [Accepted: 05/25/2018] [Indexed: 12/20/2022]
Abstract
The Lysophosphatidic Acid 1 Receptor (LPA1 receptor) has been linked to the initiation and progression of a variety of poorly treated fibrotic conditions. Several compounds that have been described as LPA1 receptor antagonists have progressed into clinical trials: 1-(4-{4-[3-methyl-4-({[(1R)-1-phenylethoxy]carbonyl}amino)-1,2-oxazol-5-yl]phenyl}phenyl)cyclopropane-1-carboxylic acid (BMS-986202) and 2-{4-methoxy-3-[2-(3-methylphenyl)ethoxy]benzamido}-2,3-dihydro-1H-indene-2-carboxylic acid (SAR-100842). We considered that as LPA1 receptor function is involved in many normal physiological processes, inhibition of specific signalling pathways associated with fibrosis may be therapeutically advantageous. We compared the binding and functional effects of a novel compound; 4-({(Cyclopropylmethyl)[4-(2-fluorophenoxy)benzoyl]amino}methyl}benzoic acid (TAK-615) with BMS-986202 and SAR-100842. Back-scattering interferometry (BSI) was used to show that the apparent affinity of TAK-615 was enhanced in the presence of LPA. The binding signal for BMS-986202 was not detected in the presence of LPA suggesting competition but interestingly the apparent affinity of SAR-100842 was also enhanced in the presence of LPA. Only BMS-986202 was able to fully inhibit the response to LPA in calcium mobilisation, β-arrestin, cAMP, GTPγS and RhoA functional assays. TAK-615 and SAR-100842 showed different inhibitory profiles in the same functional assays. Further binding studies indicated that TAK-615 is not competitive with either SAR-100842 or BMS-986202, suggesting a different site of binding. The results generated with this set of experiments demonstrate that TAK-615 acts as a negative allosteric modulator (NAM) of the LPA1 receptor. Surprisingly we find that SAR-100842 also behaves like a NAM. BMS-986202 on the other hand behaves like an orthosteric antagonist.
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Affiliation(s)
- Jonathan Ellery
- Takeda Cambridge Ltd., 418 Cambridge Science Park, Cambridge, Cambridgeshire CB4 0PZ, UK.
| | - Louise Dickson
- Takeda Cambridge Ltd., 418 Cambridge Science Park, Cambridge, Cambridgeshire CB4 0PZ, UK; Cerevance, 418 Cambridge Science Park, Cambridge, Cambridgeshire CB4 0PZ, UK.
| | - Toni Cheung
- Takeda Cambridge Ltd., 418 Cambridge Science Park, Cambridge, Cambridgeshire CB4 0PZ, UK; Cerevance, 418 Cambridge Science Park, Cambridge, Cambridgeshire CB4 0PZ, UK.
| | - Loredana Ciuclan
- Takeda Cambridge Ltd., 418 Cambridge Science Park, Cambridge, Cambridgeshire CB4 0PZ, UK; Study Enterprise, Early Clinical Development, IMED Biotech Unit, AstraZeneca, Cambridge, UK.
| | - Peter Bunyard
- Takeda Cambridge Ltd., 418 Cambridge Science Park, Cambridge, Cambridgeshire CB4 0PZ, UK; Redx Immunology, Block 33, Mereside, Alderley Park, Alderley Edge, Macclesfield SK10 4TG, UK.
| | - Stephen Mack
- Takeda Cambridge Ltd., 418 Cambridge Science Park, Cambridge, Cambridgeshire CB4 0PZ, UK; Convergence Pharmaceuticals, B900, Babraham Research Campus, Babraham, Cambridgeshire CB22 3AT, UK.
| | - William J Buffham
- Takeda Cambridge Ltd., 418 Cambridge Science Park, Cambridge, Cambridgeshire CB4 0PZ, UK; Convergence Pharmaceuticals, B900, Babraham Research Campus, Babraham, Cambridgeshire CB22 3AT, UK.
| | - William Farnaby
- Takeda Cambridge Ltd., 418 Cambridge Science Park, Cambridge, Cambridgeshire CB4 0PZ, UK; School of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, UK.
| | - Philip Mitchell
- Takeda Cambridge Ltd., 418 Cambridge Science Park, Cambridge, Cambridgeshire CB4 0PZ, UK; Charles River Discovery Research Services UK Limited, Robinson Building, Chesterford Research Park, Saffron Walden, Essex CB10 1XL, UK.
| | - Daniel Brown
- Molecular Sensing Inc., 111 10th Ave. S. Suite 110, Nashville, TN, USA; Albany Molecular Research Inc., The Conventus Building, 1001 Main Street, Buffalo, NY 14203, USA.
| | - Richard Isaacs
- Molecular Sensing Inc., 111 10th Ave. S. Suite 110, Nashville, TN, USA; Creoptix Inc., 100 Franklin St Fl7, Boston, MA 02110, USA.
| | - Matt Barnes
- Takeda Cambridge Ltd., 418 Cambridge Science Park, Cambridge, Cambridgeshire CB4 0PZ, UK; Heptares Therapeutics Ltd., BioPark, Broadwater Road, Welwyn Garden City, Hertfordshire AL7 3AX, UK.
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Patel J, Chuaiphichai S, Douglas G, Gorvin CM, Channon KM. Vascular wall regulator of G-protein signalling-1 (RGS-1) is required for angiotensin II-mediated blood pressure control. Vascul Pharmacol 2018; 108:15-22. [PMID: 29654907 PMCID: PMC6073721 DOI: 10.1016/j.vph.2018.04.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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: 04/26/2017] [Revised: 03/18/2018] [Accepted: 04/05/2018] [Indexed: 02/07/2023]
Abstract
G-Protein coupled receptors (GPCRs) activate intracellular signalling pathways by coupling to heterotrimeric G-proteins that control many physiological processes including blood pressure homeostasis. The Regulator of G-Protein Signalling-1 (RGS1) controls the magnitude and duration of downstream GPCR signalling by acting as a GTPase-activating protein for specific Gα-proteins. RGS1 has contrasting roles in haematopoietic and non-haematopoietic cells. Rgs1−/−ApoE−/− mice are protected from Angiotensin II (Ang II)-induced aortic aneurysm rupture. Conversely, Ang II treatment increases systolic blood pressure to a greater extent in Rgs1−/−ApoE−/− mice than ApoE−/− mice, independent of its role in myeloid cells. However the precise role of RGS1 in hypertension and vascular-derived cells remains unknown. We determined the effects of Rgs1 deletion on vascular function in ApoE−/− mice. Rgs1 deletion led to enhanced vasoconstriction in aortas and mesenteric arteries from ApoE−/− mice in response to phenylephrine (PE) and U46619 respectively. Rgs1 was shown to have a role in the vasculature, with endothelium-dependent vasodilation being impaired, and endothelium-independent dilatation to SNP being enhanced in Rgs1−/−ApoE−/− mesenteric arteries. To address the downstream signalling pathways in vascular smooth muscle cells (VSMCs) in response to Ang II-stimulation, we assessed pErk1/2, pJNK and pp38 MAPK activation in VSMCs transiently transfected with Rgs1. pErk1/2 signalling but not pJNK and pp38 signalling was impaired in the presence of Rgs1. Furthermore, we demonstrated that the enhanced contractile response to PE in Rgs1−/−ApoE−/− aortas was reduced by a MAPK/Erk (MEK) inhibitor and an L-type voltage gated calcium channel antagonist, suggesting that Erk1/2 signalling and calcium influx are major effectors of Rgs1-mediated vascular contractile responses, respectively. These findings indicate RGS1 is a novel regulator of blood pressure homeostasis and highlight RGS1-controlled signalling pathways in the vasculature that may be new drug development targets for hypertension.
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MESH Headings
- Angiotensin II
- Animals
- Aorta, Thoracic/metabolism
- Aorta, Thoracic/physiopathology
- Blood Pressure/genetics
- Calcium Signaling
- Cell Line
- Disease Models, Animal
- Hypertension/chemically induced
- Hypertension/genetics
- Hypertension/metabolism
- Hypertension/physiopathology
- Male
- Mesenteric Arteries/metabolism
- Mesenteric Arteries/physiopathology
- Mice, Knockout, ApoE
- Mitogen-Activated Protein Kinase 1/metabolism
- Mitogen-Activated Protein Kinase 3/metabolism
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/physiopathology
- Phosphorylation
- RGS Proteins/deficiency
- RGS Proteins/genetics
- RGS Proteins/metabolism
- Receptor, Angiotensin, Type 1/metabolism
- Vasoconstriction
- Vasodilation
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Affiliation(s)
- Jyoti Patel
- Division of Cardiovascular Medicine, British Heart Foundation Centre of Research Excellence, Radcliffe Department of Medicine, John Radcliffe Hospital, University of Oxford, Oxford, OX3 9DU, UK; Wellcome Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, UK.
| | - Surawee Chuaiphichai
- Division of Cardiovascular Medicine, British Heart Foundation Centre of Research Excellence, Radcliffe Department of Medicine, John Radcliffe Hospital, University of Oxford, Oxford, OX3 9DU, UK; Wellcome Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, UK
| | - Gillian Douglas
- Division of Cardiovascular Medicine, British Heart Foundation Centre of Research Excellence, Radcliffe Department of Medicine, John Radcliffe Hospital, University of Oxford, Oxford, OX3 9DU, UK; Wellcome Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, UK
| | - Caroline M Gorvin
- Academic Endocrine Unit, Oxford Centre for Diabetes, Endocrinology, and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, OX3 7LE, UK
| | - Keith M Channon
- Division of Cardiovascular Medicine, British Heart Foundation Centre of Research Excellence, Radcliffe Department of Medicine, John Radcliffe Hospital, University of Oxford, Oxford, OX3 9DU, UK; Wellcome Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, UK
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