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8281. Salvianolic acid B and ferulic acid synergistically promote angiogenesis in HUVECs and zebrafish via regulating VEGF signaling.

作者: Jing Chen.;Yingchao Wang.;Shufang Wang.;Xiaoping Zhao.;Lu Zhao.;Yi Wang.
来源: J Ethnopharmacol. 2022年283卷114667页
Induced vascular growth in the myocardium has been widely acknowledged as a promising intervention strategy for patients with ischemic coronary artery disease. Yet despite long-term efforts on gene, protein or cell-based pro-angiogenic therapies, the clinical translation remains challenging. Noticeably, multiple medicinal herbs have long-term documented effects in promoting blood circulation. Salvia miltiorrhiza and Ligusticum stratum are two representative traditional Chinese medicine herbs with suggested roles in enhancing organ blood supply, and Guanxinning Tablet (GXNT), a botanical drug which is formulated with these two herbs, exhibited significant efficacy against angina pectoris in clinical practices.

8282. LINC00511 Knockdown Suppresses Resistance to Cisplatin in Lung Adenocarcinoma by Interacting with miR-182-3p and BIRC5.

作者: Zhongcheng Zhu.;Yufeng Shi.;Xiaoyi Gong.;Jing Li.;Mingyun Zhang.
来源: Mol Biotechnol. 2022年64卷3期252-262页
We studied the role of long intergenic non-protein coding RNA 00,511 (LINC00511) in lung adenocarcinoma (LUAD), with a specific focus on acquired chemoresistance. LINC00511 expression was higher in responders to cisplatin (DDP, another name for cisplantin) than non-responders, in A549/DDP cells than in parental A549 cells and normal human bronchial epithelial cells (16HBE). LINC00511 knockdown decreased the half maximal inhibitory concentration (IC50) value, suppressed A549/DDP cell viability, but induced apoptosis. LINC00511 bound with miR-182 and increased the expression of baculoviral inhibitor of apoptosis protein (IAP) repeat containing 5 (BIRC5). BIRC5 knockdown mimicked the effects of LINC00511 knockdown on the IC50 value, A549/DDP cell viability, and apoptosis. BIRC5 overexpression negated the effects of LINC00511 knockdown on A549/DDP cells. In vivo, LINC00511 knockdown attenuated the tumorigenesis of A549/DDP cells after DDP injection. These results provide a novel LINC00511/miR-182/BIRC5 paradigm to explain the mechanism of acquired DDP resistance.

8283. Panobinostat reverses HepaCAM gene expression and suppresses proliferation by increasing histone acetylation in prostate cancer.

作者: E Chen.;NanJing Liu.;Yan Zhao.;Min Tang.;LiPing Ou.;XiaoHou Wu.;ChunLi Luo.
来源: Gene. 2022年808卷145977页
Increased expression of histone deacetylases (HDACs) affiliated to the epigenetic regulation is common aberration in prostate cancer (PCa). We have confirmed that hepatocyte cell adhesion molecule (hepaCAM), acting as a tumor suppressor gene, is rarely expressed in PCa previously, However, the mechanisms of which is still unknown. The level of histone acetylation reportedly may involve anti-oncogene transcription and expression. In this study, we investigated the effect of panobinostat, the broad-spectrum histone deacetylases inhibitor, on PCa LNCaP and DU145 cell growth, and observed re-expression of hepaCAM when treated with panobinostat. We demonstrated that intranuclear acetylation of lys9 of histone H3 (Ac-H3K9) were increased, while that of both mRNA and protein of HDAC1, HDAC3, and HDAC4 were decreased when the treating concentration of panobinostat increased. We confirmed the relationship between histone acetylation and the expression of hepaCAM and AR in prostate cancer tissues. We also confirmed that panobinostat could overcome the resistance for androgen deprivation therapy (ADT). Further, we combined panobinostat with Ad-hepaCAM, which resulted in significantly increased antitumor activity and significant attenuation of the proliferation-associated genes CCND1 and PCNA compared to each single treatment. In conclusion, panobinostat may enhance the acetylation of lys9 of histone 3 and reverse the hepaCAM expression through its inhibitory effect on HDACs activity in PCa LNCaP and DU145 cells; Ad-hepaCAM combined with panobinostat may synergistically inhibit the growth of LNCaP and DU145 cells, via a potential mechanism associated with the down-regulation of the expression of CCND1 and PCNA. These findings suggest that this therapeutic strategy should be further developed in clinical trials.

8284. Curcumin inhibits the invasion and metastasis of triple negative breast cancer via Hedgehog/Gli1 signaling pathway.

作者: Mengjie Li.;Tingting Guo.;Jiayi Lin.;Xia Huang.;Qiaodan Ke.;Yujian Wu.;Chunping Fang.;Chenxia Hu.
来源: J Ethnopharmacol. 2022年283卷114689页
In traditional Chinese medicine, there is a long history that curcuma longa L is used to treat distending pain of chest and belly, arthralgia of shoulder and arm aggravated by cold. Traditional Chinese medicine holds that breast cancer is caused by cold congelation, stagnation of qi and blood stasis. It is usually treated with some pungent and warm Chinese herbs, such as Curcuma longaL and Curcuma zedoaria (Christm.) Rosc, which are effective in promoting blood circulation for removing blood stasis, activating qi-flowing and relieving pain. Curcumin, a polyphenolic compound, is the main pharmacological component extracted from the rhizome of Curcuma longa L. Modern pharmacological studies have found that curcumin has many kinds of pharmacological activities of anti-inflammatory, anti-tumor, anti-angiogenesis, anti-metastasis and anti-multidrug resistance.

8285. Acute and chronic metabolic effects of carvedilol in high-fructose, high-fat diet-fed mice: implication of β-arrestin2 pathway.

作者: Hoda M S Ahmed.;Samar G Mohamed.;Wael S Ibrahim.;Asmaa M Rezk.;Amr A A Mahmoud.;Mona F Mahmoud.;Islam A A E-H Ibrahim.
来源: Can J Physiol Pharmacol. 2022年100卷1期68-77页
We aimed to investigate the acute and chronic effects of carvedilol on insulin resistance in high-fructose, high-fat diet (HFrHFD) - fed mice and the implication of the β-arrestin2 pathway. The acute effect of carvedilol (10 mg/kg, i.p.) on glucose tolerance and hepatic lipid signaling in normal and insulin resistant mice was investigated. Then, the chronic effect of carvedilol on insulin resistance and dyslipidemia in HFrHFD-fed mice was examined. Changes in β-arrestin2 and its downstream signals in liver, skeletal muscle, and adipose tissue were measured. This involved measuring phosphatidylinositol 4,5-bisphosphate (PIP2) and diacylglycerol (DAG) levels and protein kinase B (AKT) activity. Carvedilol acutely reduced fasting blood glucose levels in both normal and insulin resistant mice without significantly affecting the glucose tolerance. These acute effects were associated with increased hepatic PIP2 but decreased hepatic DAG levels. Chronic administration of carvedilol significantly ameliorated insulin resistance and dyslipidemia in HFrHFD-fed mice. These chronic effects were associated with increased β-arrestin2, PIP2, and AKT activity levels but decreased DAG levels in the classical insulin target tissues. In conclusion, carvedilol acutely maintains glucose homeostasis and chronically ameliorates insulin resistance and dyslipidemia in HFrHFD-fed mice. The insulin sensitizing effects of carvedilol are highly correlated with the upregulation of β-arrestin2 pathway.

8286. CTR-DB, an omnibus for patient-derived gene expression signatures correlated with cancer drug response.

作者: Zhongyang Liu.;Jiale Liu.;Xinyue Liu.;Xun Wang.;Qiaosheng Xie.;Xinlei Zhang.;Xiangya Kong.;Mengqi He.;Yuting Yang.;Xinru Deng.;Lele Yang.;Yaning Qi.;Jiajun Li.;Yuan Liu.;Liying Yuan.;Lihong Diao.;Fuchu He.;Dong Li.
来源: Nucleic Acids Res. 2022年50卷D1期D1184-D1199页
To date, only some cancer patients can benefit from chemotherapy and targeted therapy. Drug resistance continues to be a major and challenging problem facing current cancer research. Rapidly accumulated patient-derived clinical transcriptomic data with cancer drug response bring opportunities for exploring molecular determinants of drug response, but meanwhile pose challenges for data management, integration, and reuse. Here we present the Cancer Treatment Response gene signature DataBase (CTR-DB, http://ctrdb.ncpsb.org.cn/), a unique database for basic and clinical researchers to access, integrate, and reuse clinical transcriptomes with cancer drug response. CTR-DB has collected and uniformly reprocessed 83 patient-derived pre-treatment transcriptomic source datasets with manually curated cancer drug response information, involving 28 histological cancer types, 123 drugs, and 5139 patient samples. These data are browsable, searchable, and downloadable. Moreover, CTR-DB supports single-dataset exploration (including differential gene expression, receiver operating characteristic curve, functional enrichment, sensitizing drug search, and tumor microenvironment analyses), and multiple-dataset combination and comparison, as well as biomarker validation function, which provide insights into the drug resistance mechanism, predictive biomarker discovery and validation, drug combination, and resistance mechanism heterogeneity.

8287. Molecular profiles and urinary biomarkers of upper tract urothelial carcinomas associated with aristolochic acid exposure.

作者: Sandra Karanović.;Maude Ardin.;Zuojian Tang.;Karla Tomić.;Stephanie Villar.;Claire Renard.;Elisa Venturini.;Adam H Lorch.;Daniel S Lee.;Želimir Stipančić.;Neda Slade.;Ivana Vuković Brinar.;Damir Dittrich.;Krešimir Karlović.;Fran Borovečki.;Kathleen G Dickman.;Magali Olivier.;Arthur P Grollman.;Bojan Jelaković.;Jiri Zavadil.
来源: Int J Cancer. 2022年150卷2期374-386页
Recurrent upper tract urothelial carcinomas (UTUCs) arise in the context of nephropathy linked to exposure to the herbal carcinogen aristolochic acid (AA). Here we delineated the molecular programs underlying UTUC tumorigenesis in patients from endemic aristolochic acid nephropathy (AAN) regions in Southern Europe. We applied an integrative multiomics analysis of UTUCs, corresponding unaffected tissues and of patient urines. Quantitative microRNA (miRNA) and messenger ribonucleic acid (mRNA) expression profiling, immunohistochemical analysis by tissue microarrays and exome and transcriptome sequencing were performed in UTUC and nontumor tissues. Urinary miRNAs of cases undergoing surgery were profiled before and after tumor resection. Ribonucleic acid (RNA) and protein levels were analyzed using appropriate statistical tests and trend assessment. Dedicated bioinformatic tools were used for analysis of pathways, mutational signatures and result visualization. The results delineate UTUC-specific miRNA:mRNA networks comprising 89 miRNAs associated with 1,862 target mRNAs, involving deregulation of cell cycle, deoxyribonucleic acid (DNA) damage response, DNA repair, bladder cancer, oncogenes, tumor suppressors, chromatin structure regulators and developmental signaling pathways. Key UTUC-specific transcripts were confirmed at the protein level. Exome and transcriptome sequencing of UTUCs revealed AA-specific mutational signature SBS22, with 68% to 76% AA-specific, deleterious mutations propagated at the transcript level, a possible basis for neoantigen formation and immunotherapy targeting. We next identified a signature of UTUC-specific miRNAs consistently more abundant in the patients' urine prior to tumor resection, thereby defining biomarkers of tumor presence. The complex gene regulation programs of AAN-associated UTUC tumors involve regulatory miRNAs prospectively applicable to noninvasive urine-based screening of AAN patients for cancer presence and recurrence.

8288. Effects of long-term infliximab and tocilizumab treatment on anxiety-like behavior and cognitive function in naive rats.

作者: Frideriki Poutoglidou.;Chryssa Pourzitaki.;Maria Eleni Manthou.;Foteini Malliou.;Athanasios Saitis.;Ioannis Tsimoulas.;Spyridon Panagiotopoulos.;Dimitrios Kouvelas.
来源: Pharmacol Rep. 2022年74卷1期84-95页
Circulating cytokines have been proposed to be implicated in the development of mood disorders and cognitive impairment. This study aims to examine the effect of chronic treatment with infliximab, a tumor necrosis factor-alpha (TNF-alpha) inhibitor, and tocilizumab, an antibody against interleukin-6 (IL-6) receptor on anxiety-like behavior and cognitive function.

8289. WNT7B represses epithelial-mesenchymal transition and stem-like properties in bladder urothelial carcinoma.

作者: Lei Na.;Zhuo Wang.;Yu Bai.;Yu Sun.;Dan Dong.;Wei Wang.;Chenghai Zhao.
来源: Biochim Biophys Acta Mol Basis Dis. 2022年1868卷1期166271页
Recurrence and metastasis are the major problems of bladder urothelial carcinoma, which mainly attribute to tumor cell stemness, epithelial-mesenchymal transition (EMT) and chemoresistance.

8290. Protective effect of oligosaccharides isolated from Panax ginseng C. A. Meyer against UVB-induced skin barrier damage in BALB/c hairless mice and human keratinocytes.

作者: Zhenzhuo Li.;Rui Jiang.;Chenxu Jing.;Jianzeng Liu.;Xiaohao Xu.;Liwei Sun.;Daqing Zhao.
来源: J Ethnopharmacol. 2022年283卷114677页
Skin barrier dysfunction can lead to water and electrolyte loss, triggering homeostatic imbalances that can trigger atopic dermatitis and anaphylaxis. Panax ginseng C.A. Meyer is a traditional Chinese medicinal herb with known therapeutic benefits for the treatment of skin diseases, including photodamage repair effects and reduction of pigmentation. However, few reports exist that describe effectiveness of ginseng active components for repair of skin barrier damage.

8291. Choline-induced SLC5A7 impairs colorectal cancer growth by stabilizing p53 protein.

作者: Yuan Yin.;Zhiyuan Jiang.;Jiamei Fu.;Yang Li.;Chao Fang.;Xiaonan Yin.;Ye Chen.;Na Chen.;Junshu Li.;Yanhong Ji.;Xiaolan Su.;Meng Qiu.;Wei Huang.;Bo Zhang.;Hongxin Deng.;Lei Dai.
来源: Cancer Lett. 2022年525卷55-66页
The members of the solute carrier (SLC) superfamily are vital membrane transporters in human cells. In the present study, we determine the expression and function of SLC5 family members in colorectal cancer (CRC). Expression analysis based on The Cancer Genome Atlas database and potential clinical relation analysis based on the Oncomine database indicate that SLC5A7 is downregulated and is predicted to correlate with the staging, and prognosis response of CRC. Additional results demonstrate that SLC5A7 is downregulated and correlates with good prognosis in patients with CRC. Ectopic expression of SLC5A7 either by overexpression, or uptake of choline efficiently inhibits CRC growth. Examination of the molecular mechanism reveals that SLC5A7 promotes p53 protein expression by directly interacting with and modifying p53 and disrupting the interaction between p53 and MDM2 in wild type p53 CRC cells. Our findings establish the clear correlation between SLC5A7 and tumour growth, providing a novel potential therapeutic target for CRC.

8292. Mechanism by which Huoxue Tongluo Qiwei Decoction improves the erectile function of rats with diabetic erectile dysfunction.

作者: Xiao Li.;Jun-Long Feng.;Zi-Long Chen.;Bing-Hao Bao.;Heng-Heng Dai.;Fan-Chao Meng.;Sheng Deng.;Bin Wang.;Hai-Song Li.;Ji-Sheng Wang.
来源: J Ethnopharmacol. 2022年283卷114674页
Huoxue Tongluo Qiwei Decoction is a classical herbal formula, which can improve the symptoms of erectile dysfunction (ED) patients and has a good therapeutic effect on patients with diabetic erectile dysfunction (DIED). The main function of Huoxue Tongluo Qiwei Decoction is to stimulate the blood circulation and dredge collaterals, remove blood stasis, and calm wind.

8293. Ganoderma lucidum polysaccharides protect against sepsis-induced cardiac dysfunction by activating SIRT1.

作者: Zhong-Heng Xu.;Xiao Su.;Geng Yang.;Tao Qin.;Yu Liu.
来源: J Pharm Pharmacol. 2022年74卷1期124-130页
To investigate whether the silent information regulator 1 (SIRT1) was involved in the protective effects of Ganoderma lucidum polysaccharides (GLP) against sepsis-induced cardiac dysfunction.

8294. Sulforaphane-Dependent Up-Regulation of NRF2 Activity Alleviates Both Systemic Inflammatory Response and Lung Injury After Hemorrhagic Shock/Resuscitation in Mice.

作者: Weiqiang Liang.;Johannes Greven.;Athanassios Fragoulis.;Klemens Horst.;Felix Bläsius.;Christoph Wruck.;Thomas Pufe.;Philipp Kobbe.;Frank Hildebrand.;Philipp Lichte.
来源: Shock. 2022年57卷2期221-229页
Hemorrhagic shock/resuscitation (HS/R) is closely associated with overwhelming oxidative stress and systemic inflammation. As an effective activator of the nuclear factor-erythroid factor 2 related factor 2 (Nrf2) pathway, sulforaphane (SFN) exerts antioxidant and anti-inflammatory effects. We explored SFN's effects on alveolar macrophages (AMs), systemic inflammation, and pulmonary damage in an isolated murine HS/R model. Male C57/BL6 wild type and transgenic antioxidant response element (ARE)-luciferase (luc) mice (both n = 6 per group) were exposed to either pressure-controlled HS/R (mean arterial pressure 35-45 mm Hg for 90 min) or sham procedure (surgery without HS/R) or were sacrificed without intervention (control group). Fluid resuscitation was performed via the reinfusion of withdrawn blood and 0.9% saline. Sulforaphane or 0.9% saline (vehicle) was administrated intraperitoneally. Mice were sacrificed 6, 24, or 72 h after resuscitation. Bioluminescence imaging of ARE-luc mice was conducted to measure pulmonary Nrf2 activity. Plasma was collected to determine systemic cytokine levels. Alveolar macrophages were isolated before measuring cytokines in the supernatant and performing immunofluorescence staining, as well as Western blot for intracellular Nrf2. Histological damage was assessed via the acute lung injury score and wet/dry ratio.Hemorrhagic shock/resuscitation was associated with pulmonary Nrf2 activation. Sulforaphane enhanced pulmonary Nrf2 activity and the Nrf2 activation of AM, while it decreased lung damage. Sulforaphane exerted down-regulatory effects on AM-generated and systemic pro-inflammatory mediators, while it did not have such effects on IL-10.In conclusion, SFN beneficially enhances pulmonary Nrf2 activity and promotes Nrf2 accumulation in AMs' nuclei. This may exert not only local protective effects but also systemic effects via the down-regulation of pro-inflammatory cytokines. The administration of Nrf2 activator post-HS/R may represent an innovative treatment strategy.

8295. Immunomodulatory functions of TRPM7 and its implications in autoimmune diseases.

作者: Hong-Yu Liang.;Yong Chen.;Xin Wei.;Gang-Gang Ma.;Jie Ding.;Chao Lu.;Ren-Peng Zhou.;Wei Hu.
来源: Immunology. 2022年165卷1期3-21页
An autoimmune disease is an inappropriate response to one's tissues due to a break in immune tolerance and exposure to self-antigens. It often leads to structural and functional damage to organs and systemic disorders. To date, there are no effective interventions to prevent the progression of autoimmune diseases. Hence, there is an urgent need for new treatment targets. TRPM7 is an enzyme-coupled, transient receptor ion channel of the subfamily M that plays a vital role in pathologic and physiologic conditions. While TRPM7 is constitutively activated under certain conditions, it can regulate cell migration, polarization, proliferation and cytokine secretion. However, a growing body of evidence highlights the critical role of TRPM7 in autoimmune diseases, including rheumatoid arthritis, multiple sclerosis and diabetes. Herein, we present (a) a review of the channel kinase properties of TRPM7 and its pharmacological properties, (b) discuss the role of TRPM7 in immune cells (neutrophils, macrophages, lymphocytes and mast cells) and its upstream immunoreactive substances, and (c) highlight TRPM7 as a potential therapeutic target for autoimmune diseases.

8296. The modulation of PI3K/Akt pathway by 3β hydroxylup-12-en-28-oic acid isolated from Thymus linearis induces cell death in HCT-116 cells.

作者: Rohina Bashir.;Ovais Ahmad Zargar.;Abid Hamid Dar.;Nalli Yedukondalu.;Qazi Parvaiz.;Rabia Hamid.
来源: Chem Biol Drug Des. 2022年99卷1期162-178页
The presence of intricate carbon skeletons in natural compounds enhances their bioactivity spectrum with unique modes of action at several targets in various dreadful diseases like cancer. The present study was designed to purify the molecules from Thymus linearis and elucidate their antiproliferative activity. The compounds were isolated from the active methanolic extract of Thymus linearis through column chromatography and characterized by various spectroscopic techniques. Antiproliferative activity of isolated compounds was evaluated using MTT assay on cancer and normal cell lines. Mechanism of cell death was elucidated using flow cytometric, microscopic, and Western blot analysis. Four compounds, Sitosterol, Chrysin, 3β-hydroxylup-12-en-28-oic acid (3BH), and β-Sitosterol glycoside, were isolated. Among these, 3BH was most potent antiproliferative agent across all cell lines under study, HCT-116 being the most affected one. 3BH was demonstrated to downregulate PI3Ksubunits (p110α and p85α), downstream pAktSer473 and prompted G1 phase cell cycle arrest. The cell cycle CDK inhibitor p27 and p21 were upregulated with simultaneous downregulation of cyclin D1 and cyclin E in HCT-116 cells. This was accompanied by apoptosis, as depicted by decrease in Bcl-2/Bax ratio, with increase in active caspases-3 and caspase-9, cleavage of PARP-1, the generation of reactive oxygen species (ROS), and the loss of mitochondrial membrane potential. The findings established that 3BH induced cell death in HCT-116 cells by modulating PI3K/Akt signaling axis, impeding cell cycle, and instigating apoptosis.

8297. The signaling pathways of traditional Chinese medicine in promoting diabetic wound healing.

作者: Xin Zhou.;Yanling Guo.;Kun Yang.;Peng Liu.;Jun Wang.
来源: J Ethnopharmacol. 2022年282卷114662页
The diabetic wound is one of the common chronic complications of diabetes, which seriously affects patients' quality of life and even causes disability and death. Traditional Chinese medicine (TCM) is a unique and precious resource in China, which has a good curative effect and safety. At present, it has been found that Chinese herbal compounds and effective active ingredients can effectively promote diabetic wound healing, and its mechanism needs to be further studied. Signaling pathways are involved in the pathogenesis and progression of diabetic wounds, which is one of the main targets for the pathologic mechanism of diabetic wounds and the pharmacological research of therapeutic drugs.

8298. Knockdown of Long Non-coding RNA TUG1 Suppresses Migration and Tube Formation in High Glucose-Stimulated Human Retinal Microvascular Endothelial Cells by Sponging miRNA-145.

作者: Qian Shi.;Jinhua Tang.;Minfeng Wang.;Lishuai Xu.;Lijun Shi.
来源: Mol Biotechnol. 2022年64卷2期171-177页
Diabetic retinopathy (DR) is a serious complication of diabetes mellitus. The purpose of this study was to investigate the potential functional role of long non-coding RNA TUG1 in high glucose (HG)-stimulated human retinal microvascular endothelial cells (hRMECs). The results demonstrated that following 72 h of HG stimulation, enhanced proliferation, migration, and tube formation process were observed in hRMECs. Moreover, HG treatment markedly increased TUG1 expression in hRMECs, and knockdown of TUG1 notably restrained the aberrant phenotypes of hRMECs induced by HG. Mechanistically, TUG1 may serve as a competing endogenous RNA (ceRNA) for miR-145, thereby blocking the repression on VEGF-A in hRMECs. Rescue experiments further indicated that inhibition of miR-145 abolished the beneficial role of TUG1 knockdown in HG-treated hRMECs. Our data suggested that knockdown of TUG1 protects hRMECs against HG stimulation partly by regulating miR-145/VEGF-A axis.

8299. Potential therapeutic efficacy of pachymic acid in chronic kidney disease induced in rats: role of Wnt/β-catenin/renin-angiotensin axis.

作者: Nahla N Younis.;Hoda E Mohamed.;Mohamed A Shaheen.;Asmaa M Abdelghafour.;Sally K Hammad.
来源: J Pharm Pharmacol. 2022年74卷1期112-123页
Chronic kidney disease (CKD) is a major public health problem associated with high mortality. The therapeutic effects of pachymic in CKD management and its underlying mechanisms have not been studied. Therefore, we aimed to investigate the possible inhibitory effect of PA on renal Wnt/β-catenin signalling in CKD.

8300. An alternative, zeaxanthin epoxidase-independent abscisic acid biosynthetic pathway in plants.

作者: Kun-Peng Jia.;Jianing Mi.;Shawkat Ali.;Hajime Ohyanagi.;Juan C Moreno.;Abdugaffor Ablazov.;Aparna Balakrishna.;Lamis Berqdar.;Alessia Fiore.;Gianfranco Diretto.;Claudio Martínez.;Angel R de Lera.;Takashi Gojobori.;Salim Al-Babili.
来源: Mol Plant. 2022年15卷1期151-166页
Abscisic acid (ABA) is an important carotenoid-derived phytohormone that plays essential roles in plant response to biotic and abiotic stresses as well as in various physiological and developmental processes. In Arabidopsis, ABA biosynthesis starts with the epoxidation of zeaxanthin by the ABA DEFICIENT 1 (ABA1) enzyme, leading to epoxycarotenoids; e.g., violaxanthin. The oxidative cleavage of 9-cis-epoxycarotenoids, a key regulatory step catalyzed by 9-CIS-EPOXYCAROTENOID DIOXYGENASE, forms xanthoxin, which is converted in further reactions mediated by ABA DEFICIENT 2 (ABA2), ABA DEFICIENT 3 (ABA3), and ABSCISIC ALDEHYDE OXIDASE 3 (AAO3) into ABA. By combining genetic and biochemical approaches, we unravel here an ABA1-independent ABA biosynthetic pathway starting upstream of zeaxanthin. We identified the carotenoid cleavage products (i.e., apocarotenoids, β-apo-11-carotenal, 9-cis-β-apo-11-carotenal, 3-OH-β-apo-11-carotenal, and 9-cis-3-OH-β-apo-11-carotenal) as intermediates of this ABA1-independent ABA biosynthetic pathway. Using labeled compounds, we showed that β-apo-11-carotenal, 9-cis-β-apo-11-carotenal, and 3-OH-β-apo-11-carotenal are successively converted into 9-cis-3-OH-β-apo-11-carotenal, xanthoxin, and finally into ABA in both Arabidopsis and rice. When applied to Arabidopsis, these β-apo-11-carotenoids exert ABA biological functions, such as maintaining seed dormancy and inducing the expression of ABA-responsive genes. Moreover, the transcriptomic analysis revealed a high overlap of differentially expressed genes regulated by β-apo-11-carotenoids and ABA, suggesting that β-apo-11-carotenoids exert ABA-independent regulatory activities. Taken together, our study identifies a biological function for the common plant metabolites, β-apo-11-carotenoids, extends our knowledge about ABA biosynthesis, and provides new insights into plant apocarotenoid metabolic networks.
共有 8370 条符合本次的查询结果, 用时 5.5603798 秒