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Shi M, Wang C, Wang P, Zhang M, Liao W. Methylation in DNA, histone, and RNA during flowering under stress condition: A review. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2022; 324:111431. [PMID: 36028071 DOI: 10.1016/j.plantsci.2022.111431] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 08/07/2022] [Accepted: 08/19/2022] [Indexed: 06/15/2023]
Abstract
Flowering is the most critical transition period in the whole lifecycle of plants, and it is a highly sensitive period to stress. New combinations of temperature, drought stress, carbon dioxide and other abiotic/biotic conditions resulting from contemporary climate change affect the flowering process. Plants have evolved several strategies to deal with environmental stresses, including epigenetic modifications. Numerous studies show that environmental stresses trigger methylation/demethylation during flowering to preserve/accelerate plant lifecycle. What's more, histone and DNA methylation can be induced to respond to stresses, resulting in changes of flowering gene expression and enhancing stress tolerance in plants. Furthermore, RNA methylation may influence stress-regulated flowering by regulating mRNA stability and antioxidant mechanism. Our review presents the involvement of methylation in stress-repressed and stress-induced flowering. The crosstalk between methylation and small RNAs, phytohormones and exogenous substances (such as salicylic acid, nitric oxide) during flowering under different stresses were discussed. The latest regulatory evidence of RNA methylation in stress-regulated flowering was collected for the first time. Meanwhile, the limited evidences of methylation in biotic stress-induced flowering were summarized. Thus, the review provides insights into understanding of methylation mechanism in stress-regulated flowering and makes use for the development of regulating plant flowering at epigenetic level in the future.
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Affiliation(s)
- Meimei Shi
- College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China
| | - Chunlei Wang
- College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China
| | - Peng Wang
- College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China
| | - Meiling Zhang
- College of Science, Gansu Agricultural University, Lanzhou 730070, China
| | - Weibiao Liao
- College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China.
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Huang H, Liu Z, Qi X, Gao N, Chang J, Yang M, Na S, Liu Y, Song R, Li L, Chen G, Zhou H. Rhubarb granule promotes diethylnitrosamine-induced liver tumorigenesis by activating the oxidative branch of pentose phosphate pathway via G6PD in rats. JOURNAL OF ETHNOPHARMACOLOGY 2021; 281:114479. [PMID: 34343647 DOI: 10.1016/j.jep.2021.114479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 07/19/2021] [Accepted: 07/30/2021] [Indexed: 06/13/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Rhubarb is a natural herbal medicine widely used clinically with numerous pharmacological activities including anti-cancer. Specifically, several studies reported that free anthraquinones from Rhubarb suppressed the proliferation of hepatoma cells. Nonetheless, recent studies revealed that Rhubarb caused hepatotoxicity in vivo, confirming its "two-way" effect on the liver. Therefore, the efficacy and safety of Rhubarb in the in vivo treatment of liver cancer should be further elucidated. AIM OF THE STUDY This study investigated the presence of hepatoprotection or hepatotoxicity of Rhubarb in diethylnitrosamine (DEN)-induced hepatocarcinogenesis. MATERIAL AND METHODS A total of 112 male Sprague-Dawley rats weighing 190-250 g were enrolled. The rats were induced hepatocarcinogenesis using diethylnitrosamine (0.002 g/rat) until 17 weeks. Starting at week 11, Rhubarb granules (4 g/kg and 8 g/kg) were intragastrically administered daily for 7 weeks. All rats were euthanized at week 20 and the livers were analyzed via non-targeted metabolomics analysis. We established hepatic glucose 6 phosphate (6PG) levels and glucose 6 phosphate dehydrogenase (G6PD) activities to assess the pentose phosphate pathway (PPP). And the liver injuries of rats were analyzed via histological changes, hepatic function, as well as hepatic protein levels of alpha-fetoprotein (AFP), pyruvate kinase isozyme type M2 (PKM2), and proliferating cell nuclear antigen (PCNA). Furthermore, polydatin (0.1 g/kg/d) as a specific inhibitor of G6PD was used to treat rats. Notably, their histological changes, hepatic function, hepatic 6PG levels, hepatic G6PD activities, PCNA levels, and PKM2 levels were recorded. RESULTS Non-targeted metabolomics revealed that Rhubarb regulated the PPP in the liver of Rhubarb-DEN-treated rats. Besides, Rhubarb activated the oxidative branch of the PPP by activating G6PD (a rate-limiting enzyme in the oxidative PPP) in the liver of Rhubarb-DEN-treated rats. Meanwhile, Rhubarb promoted DEN-induced hepatocarcinogenesis. Moreover, polydatin attenuated the promoting effect of Rhubarb on DEN-induced hepatocarcinogenesis. CONCLUSIONS Rhubarb promoted DEN-induced hepatocarcinogenesis by activating the PPP, indicating that the efficacy and safety of Rhubarb in the treatment of liver cancer deserve to be deliberated.
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Affiliation(s)
- Hongwu Huang
- Department of Biochemistry and Molecular Biology, School of Integrated Chinese and Western Medicine, Anhui University of Traditional Chinese Medicine, Hefei, Anhui Province, PR China
| | - Zhenzhen Liu
- Department of Biochemistry and Molecular Biology, School of Integrated Chinese and Western Medicine, Anhui University of Traditional Chinese Medicine, Hefei, Anhui Province, PR China
| | - Xiaoru Qi
- Department of Biochemistry and Molecular Biology, School of Integrated Chinese and Western Medicine, Anhui University of Traditional Chinese Medicine, Hefei, Anhui Province, PR China
| | - Nailong Gao
- Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, PR China
| | - Jianguo Chang
- Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, PR China
| | - Miaomiao Yang
- Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui Province, PR China; Clinical Pathology Center, The Fourth Affiliated Hospital of Anhui Medical University, Hefei, Anhui Province, PR China
| | - Sha Na
- Department of Biochemistry and Molecular Biology, School of Integrated Chinese and Western Medicine, Anhui University of Traditional Chinese Medicine, Hefei, Anhui Province, PR China
| | - Yanyan Liu
- Department of Biochemistry and Molecular Biology, School of Integrated Chinese and Western Medicine, Anhui University of Traditional Chinese Medicine, Hefei, Anhui Province, PR China
| | - Rui Song
- Department of Biochemistry and Molecular Biology, School of Integrated Chinese and Western Medicine, Anhui University of Traditional Chinese Medicine, Hefei, Anhui Province, PR China
| | - Lu Li
- Department of Biochemistry and Molecular Biology, School of Integrated Chinese and Western Medicine, Anhui University of Traditional Chinese Medicine, Hefei, Anhui Province, PR China; Institute of Integrated Chinese and Western Medicine, Anhui Academy of Chinese Medicine, Hefei, Anhui Province, PR China.
| | - Guangliang Chen
- Institute of Integrated Chinese and Western Medicine, Anhui Academy of Chinese Medicine, Hefei, Anhui Province, PR China.
| | - Hui Zhou
- Department of Biochemistry and Molecular Biology, School of Integrated Chinese and Western Medicine, Anhui University of Traditional Chinese Medicine, Hefei, Anhui Province, PR China.
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