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Zhang Y, Yang X, Nvsvrot T, Huang L, Cai G, Ding Y, Ren W, Wang N. The transcription factor WRKY75 regulates the development of adventitious roots, lateral buds and callus by modulating hydrogen peroxide content in poplar. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:1483-1498. [PMID: 34791155 DOI: 10.1093/jxb/erab501] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 11/12/2021] [Indexed: 06/13/2023]
Abstract
Hydrogen peroxide (H2O2) plays important roles in plant development. Adventitious roots (AR), lateral buds (LB) and callus formation are important traits for plants. Here, a gene encoding RESPIRATORY BURST OXIDASE HOMOLOG B (PdeRBOHB) from poplar line 'NL895' (Populus. deltoides × P. euramericana) was predicted to be involved in H2O2 accumulation, and lines with reduced expression were generated. H2O2 content was decreased, and the development of adventitious roots, lateral buds, and callus was inhibited in reduced expression PdeRBOHB lines. A gene encoding PdeWRKY75 was identified as the upstream transcription factor positively regulating PdeRBOHB. This regulation was confirmed by dual luciferase reporter assay, GUS transient expression analysis and electrophoretic mobility shift assay. In the reduced expression PdeWRKY75 lines, H2O2 content was decreased and the development of adventitious roots, lateral buds, and callus development was inhibited, while in the overexpression lines, H2O2 content was increased and the development of adventitious roots and lateral buds was inhibited, but callus formation was enhanced. Additionally, reduced expression PdeRBOHB lines showed lowered expression of PdeWRKY75, while exogenous application of H2O2 showed the opposite effect. Together, these results suggest that PdeWRKY75 and PdeRBOHB are part of a regulatory module in H2O2 accumulation, which is involved in the regulation of multiple biological processes.
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Affiliation(s)
- Yan Zhang
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, China
| | - Xiaoqing Yang
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, China
| | - Tashbek Nvsvrot
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, China
| | - Liyu Huang
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, China
| | - Guanghua Cai
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yiwei Ding
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, China
| | - Wenyu Ren
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, China
| | - Nian Wang
- College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, China
- Hubei Engineering Technology Research Center for Forestry Information, Huazhong Agricultural University, Wuhan, 430070, China
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Pathak S, Gokhroo A, Kumar Dubey A, Majumdar S, Gupta S, Almeida A, Mahajan GB, Kate A, Mishra P, Sharma R, Kumar S, Vishwakarma R, Balakrishnan A, Atreya H, Nandi D. 7-Hydroxy Frullanolide, a sesquiterpene lactone, increases intracellular calcium amounts, lowers CD4 + T cell and macrophage responses, and ameliorates DSS-induced colitis. Int Immunopharmacol 2021; 97:107655. [PMID: 33901737 DOI: 10.1016/j.intimp.2021.107655] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 03/19/2021] [Accepted: 04/03/2021] [Indexed: 12/16/2022]
Abstract
Sesquiterpene lactones are a class of anti-inflammatory molecules obtained from plants belonging to the Asteraceae family. In this study, the effects of 7-hydroxy frullanolide (7HF), a sesquiterpene lactone, in inhibiting CD4+ T cell and peritoneal macrophage responses were investigated. 7HF, in a dose dependent manner, lowers CD69 upregulation, IL2 production and CD4+ T cell cycling upon activation with the combination of anti-CD3 and anti-CD28. Further mechanistic studies demonstrated that 7HF, at early time points, increases intracellular Ca2+ amounts, over and above the levels induced upon activation. The functional relevance of 7HF-induced Ca2+ increase was confirmed using sub-optimal amounts of BAPTA, an intracellular Ca2+ chelator, which lowers lactate and rescues CD4+ T cell cycling. In addition, 7HF lowers T cell cycling with the combination of PMA and Ionomycin. However, 7HF increases CD4+ T cell cycling with sub-optimal activating signals: only PMA or anti-CD3. Furthermore, LPS-induced nitrite and IL6 production by peritoneal macrophages is inhibited by 7HF in a Ca2+-dependent manner. Studies with Ca2+ channel inhibitors, Ruthenium Red and 2-Aminoethoxydiphenyl borate, lowers the inhibitory effects of 7HF on CD4+ T cell and macrophage responses. In silico studies demonstrated that 7HF binds to Ca2+ channels, TRPV1, IP3R and SERCA, which is mechanistically important. Finally, intraperitoneal administration of 7HF lowers serum inflammatory cytokines, IFNγ and IL6, and reduces the effects of DSS-induced colitis with respect to colon length and colon damage. Overall, this study sheds mechanistic light on the anti-inflammatory potential of 7HF, a natural plant compound, in lowering immune responses.
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Affiliation(s)
- Sanmoy Pathak
- Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India
| | - Abhijeet Gokhroo
- Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India
| | - Ashim Kumar Dubey
- Undergraduate Program, Indian Institute of Science, Bangalore 560012, India
| | - Shamik Majumdar
- Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India
| | - Souradeep Gupta
- NMR Research Facility, Indian Institute of Science, Bangalore 560012, India
| | - Asha Almeida
- High Throughput Department, Piramal Research Center,1 Nirlon Complex, Off Western Express Highway, Goregaon East, Mumbai 400063, India
| | - Girish B Mahajan
- High Throughput Department, Piramal Research Center,1 Nirlon Complex, Off Western Express Highway, Goregaon East, Mumbai 400063, India
| | - Abhijeet Kate
- High Throughput Department, Piramal Research Center,1 Nirlon Complex, Off Western Express Highway, Goregaon East, Mumbai 400063, India
| | - Prabhu Mishra
- High Throughput Department, Piramal Research Center,1 Nirlon Complex, Off Western Express Highway, Goregaon East, Mumbai 400063, India
| | - Rajiv Sharma
- High Throughput Department, Piramal Research Center,1 Nirlon Complex, Off Western Express Highway, Goregaon East, Mumbai 400063, India
| | - Sanjay Kumar
- High Throughput Department, Piramal Research Center,1 Nirlon Complex, Off Western Express Highway, Goregaon East, Mumbai 400063, India
| | - Ram Vishwakarma
- High Throughput Department, Piramal Research Center,1 Nirlon Complex, Off Western Express Highway, Goregaon East, Mumbai 400063, India
| | - Arun Balakrishnan
- High Throughput Department, Piramal Research Center,1 Nirlon Complex, Off Western Express Highway, Goregaon East, Mumbai 400063, India
| | - Hanudatta Atreya
- NMR Research Facility, Indian Institute of Science, Bangalore 560012, India
| | - Dipankar Nandi
- Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India.
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