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Abstract
PURPOSE OF REVIEW To highlight recent advances in the understanding of nutritional immunology and in the development of novel therapeutics for inflammatory bowel disease (IBD). RECENT FINDINGS We highlight the variety of factors that contribute to the interaction of the immune system and nutrition including the microbiome and the nervous system stimulation of the gut. We describe the potential for therapeutic development in IBD. Further, we review the cellular metabolic effects on immune activation and promising therapeutic targets. Finally, we show how the progression of understanding the role of lanthionine synthetase C-like 2 has encompassed both nutritional and therapeutic advances and led to the development of novel oral small molecule therapeutics for IBD. SUMMARY Nutritional immunology and drug development research centered around immunoregulatory pathways can provide safer and more effective drugs while accelerating the path to cures.
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G-protein coupling and nuclear translocation of the human abscisic acid receptor LANCL2. Sci Rep 2016; 6:26658. [PMID: 27222287 PMCID: PMC4879523 DOI: 10.1038/srep26658] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Accepted: 04/27/2016] [Indexed: 02/03/2023] Open
Abstract
Abscisic acid (ABA), a long known phytohormone, has been recently demonstrated to be present also in humans, where it targets cells of the innate immune response, mesenchymal and hemopoietic stem cells and cells involved in the regulation of systemic glucose homeostasis. LANCL2, a peripheral membrane protein, is the mammalian ABA receptor. We show that N-terminal glycine myristoylation causes LANCL2 localization to the plasmamembrane and to cytoplasmic membrane vesicles, where it interacts with the α subunit of a Gi protein and starts the ABA signaling pathway via activation of adenylate cyclase. Demyristoylation of LANCL2 by chemical or genetic means triggers its nuclear translocation. Nuclear enrichment of native LANCL2 is also induced by ABA treatment. Therefore human LANCL2 is a non-transmembrane G protein-coupled receptor susceptible to hormone-induced nuclear translocation.
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53
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Abscisic acid influx into human nucleated cells occurs through the anion exchanger AE2. Int J Biochem Cell Biol 2016; 75:99-103. [PMID: 27015766 DOI: 10.1016/j.biocel.2016.03.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 02/09/2016] [Accepted: 03/17/2016] [Indexed: 11/24/2022]
Abstract
Abscisic acid (ABA) is a hormone conserved from cyanobacteria to higher plants, where it regulates responses to environmental stimuli. ABA also plays a role in mammalian physiology, pointedly in inflammatory responses and in glycemic control. As the animal ABA receptor is on the intracellular side of the plasma membrane, a transporter is required for the hormone's action. Here we demonstrate that ABA transport in human nucleated cells occurs via the anion exchanger AE2. Together with the recent demonstration that ABA influx into human erythrocytes occurs via Band 3, this result identifies the AE family members as the mammalian ABA transporters.
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Glennon EKK, Adams LG, Hicks DR, Dehesh K, Luckhart S. Supplementation with Abscisic Acid Reduces Malaria Disease Severity and Parasite Transmission. Am J Trop Med Hyg 2016; 94:1266-75. [PMID: 27001761 DOI: 10.4269/ajtmh.15-0904] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 01/29/2016] [Indexed: 01/20/2023] Open
Abstract
Nearly half of the world's population is at risk for malaria. Increasing drug resistance has intensified the need for novel therapeutics, including treatments with intrinsic transmission-blocking properties. In this study, we demonstrate that the isoprenoid abscisic acid (ABA) modulates signaling in the mammalian host to reduce parasitemia and the formation of transmissible gametocytes and in the mosquito host to reduce parasite infection. Oral ABA supplementation in a mouse model of malaria was well tolerated and led to reduced pathology and enhanced gene expression in the liver and spleen consistent with infection recovery. Oral ABA supplementation also increased mouse plasma ABA to levels that can signal in the mosquito midgut upon blood ingestion. Accordingly, we showed that supplementation of a Plasmodium falciparum-infected blood meal with ABA increased expression of mosquito nitric oxide synthase and reduced infection prevalence in a nitric oxide-dependent manner. Identification of the mechanisms whereby ABA reduces parasite growth in mammals and mosquitoes could shed light on the balance of immunity and metabolism across eukaryotes and provide a strong foundation for clinical translation.
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Affiliation(s)
- Elizabeth K K Glennon
- Department of Medical Microbiology and Immunology, School of Medicine, University of California, Davis, Davis, California; Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas; Department of Plant Biology, University of California, Davis, Davis, California
| | - L Garry Adams
- Department of Medical Microbiology and Immunology, School of Medicine, University of California, Davis, Davis, California; Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas; Department of Plant Biology, University of California, Davis, Davis, California
| | - Derrick R Hicks
- Department of Medical Microbiology and Immunology, School of Medicine, University of California, Davis, Davis, California; Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas; Department of Plant Biology, University of California, Davis, Davis, California
| | - Katayoon Dehesh
- Department of Medical Microbiology and Immunology, School of Medicine, University of California, Davis, Davis, California; Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas; Department of Plant Biology, University of California, Davis, Davis, California
| | - Shirley Luckhart
- Department of Medical Microbiology and Immunology, School of Medicine, University of California, Davis, Davis, California; Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas; Department of Plant Biology, University of California, Davis, Davis, California
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55
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Qi CC, Shu YM, Chen FH, Ding YQ, Zhou JN. Sensitivity during the forced swim test is a key factor in evaluating the antidepressant effects of abscisic acid in mice. Behav Brain Res 2015; 300:106-13. [PMID: 26698394 DOI: 10.1016/j.bbr.2015.12.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 12/03/2015] [Accepted: 12/11/2015] [Indexed: 12/17/2022]
Abstract
Abscisic acid (ABA), a crucial phytohormone, is distributed in the brains of mammals and has been shown to have antidepressant effects in the chronic unpredictable mild stress test. The forced swim test (FST) is another animal model that can be used to assess antidepressant-like behavior in rodents. Here, we report that the antidepressant effects of ABA are associated with sensitivities to the FST in mice. Based on mean immobility in the 5-min forced swim pre-test, ICR mice were divided into short immobility mice (SIM) and long immobility mice (LIM) substrains. FST was carried out 8 days after drug administration. Learned helplessness, as shown by increased immobility, was only observed in SIM substrain and could be prevented by an 8-day ABA treatment. Our results show that ABA has antidepressant effects in SIM substrain and suggest that mice with learned helplessness might be more suitable for screening potential antidepressant drugs.
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Affiliation(s)
- Cong-Cong Qi
- Key Laboratory of Arrhythmias, Ministry of Education of China, East Hospital, and Department of Anatomy and Neurobiology, Tongji University School of Medicine, Shanghai 200120, China; CAS Key Laboratory of Brain Function and Diseases, School of Life Science, University of Science and Technology of China, Hefei 230027, Anhui, China
| | - Yu-Mian Shu
- CAS Key Laboratory of Brain Function and Diseases, School of Life Science, University of Science and Technology of China, Hefei 230027, Anhui, China
| | - Fang-Han Chen
- CAS Key Laboratory of Brain Function and Diseases, School of Life Science, University of Science and Technology of China, Hefei 230027, Anhui, China
| | - Yu-Qiang Ding
- Key Laboratory of Arrhythmias, Ministry of Education of China, East Hospital, and Department of Anatomy and Neurobiology, Tongji University School of Medicine, Shanghai 200120, China
| | - Jiang-Ning Zhou
- CAS Key Laboratory of Brain Function and Diseases, School of Life Science, University of Science and Technology of China, Hefei 230027, Anhui, China.
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Zhou N, Yao Y, Ye H, Zhu W, Chen L, Mao Y. Abscisic-acid-induced cellular apoptosis and differentiation in glioma via the retinoid acid signaling pathway. Int J Cancer 2015; 138:1947-58. [PMID: 26594836 DOI: 10.1002/ijc.29935] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Accepted: 11/10/2015] [Indexed: 12/15/2022]
Abstract
Retinoid acid (RA) plays critical roles in regulating differentiation and apoptosis in a variety of cancer cells. Abscisic acid (ABA) and RA are direct derivatives of carotenoids and share structural similarities. Here we proposed that ABA may also play a role in cellular differentiation and apoptosis by sharing a similar signaling pathway with RA that may be involved in glioma pathogenesis. We reported for the first time that the ABA levels were twofold higher in low-grade gliomas compared with high-grade gliomas. In glioma tissues, there was a positive correlation between the ABA levels and the transcription of cellular retinoic acid-binding protein 2 (CRABP2) and a negative correlation between the ABA levels and transcription of fatty acid-binding protein 5 (FABP5). ABA treatment induced a significant increase in the expression of CRABP2 and a decrease in the expression of peroxisome proliferator-activated receptor (PPAR) in glioblastoma cells. Remarkably, both cellular apoptosis and differentiation were increased in the glioblastoma cells after ABA treatment. ABA-induced cellular apoptosis and differentiation were significantly reduced by selectively silencing RAR-α, while RAR-α overexpression exaggerated the ABA-induced effects. These results suggest that ABA may play a role in the pathogenesis of glioma by promoting cellular apoptosis and differentiation through the RA signaling pathway.
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Affiliation(s)
- Nan Zhou
- Department of Neurosurgery, Huashan Hospital, Fudan University, Middle Urumqi Road 12, Shanghai, 200040, China
| | - Yu Yao
- Department of Neurosurgery, Huashan Hospital, Fudan University, Middle Urumqi Road 12, Shanghai, 200040, China
| | - Hongxing Ye
- Department of Neurosurgery, Huashan Hospital, Fudan University, Middle Urumqi Road 12, Shanghai, 200040, China
| | - Wei Zhu
- Department of Neurosurgery, Huashan Hospital, Fudan University, Middle Urumqi Road 12, Shanghai, 200040, China
| | - Liang Chen
- Department of Neurosurgery, Huashan Hospital, Fudan University, Middle Urumqi Road 12, Shanghai, 200040, China
| | - Ying Mao
- Department of Neurosurgery, Huashan Hospital, Fudan University, Middle Urumqi Road 12, Shanghai, 200040, China
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Dudonné S, Dubé P, Anhê FF, Pilon G, Marette A, Lemire M, Harris C, Dewailly E, Desjardins Y. Comprehensive analysis of phenolic compounds and abscisic acid profiles of twelve native Canadian berries. J Food Compost Anal 2015. [DOI: 10.1016/j.jfca.2015.09.003] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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58
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Bruzzone S, Magnone M, Mannino E, Sociali G, Sturla L, Fresia C, Booz V, Emionite L, De Flora A, Zocchi E. Abscisic Acid Stimulates Glucagon-Like Peptide-1 Secretion from L-Cells and Its Oral Administration Increases Plasma Glucagon-Like Peptide-1 Levels in Rats. PLoS One 2015; 10:e0140588. [PMID: 26488296 PMCID: PMC4619318 DOI: 10.1371/journal.pone.0140588] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 09/26/2015] [Indexed: 11/26/2022] Open
Abstract
In recent years, Abscisic Acid (ABA) has been demonstrated to be involved in the regulation of glucose homeostasis in mammals as an endogenous hormone, by stimulating both insulin release and peripheral glucose uptake. In addition, ABA is released by glucose- or GLP-1-stimulated β-pancreatic cells. Here we investigated whether ABA can stimulate GLP-1 release. The human enteroendocrine L cell line hNCI-H716 was used to explore whether ABA stimulates in vitro GLP-1 secretion and/or transcription. ABA induced GLP-1 release in hNCI-H716 cells, through a cAMP/PKA-dependent mechanism. ABA also enhanced GLP-1 transcription. In addition, oral administration of ABA significantly increased plasma GLP-1 and insulin levels in rats. In conclusion, ABA can stimulate GLP-1 release: this result and the previous observation that GLP-1 stimulates ABA release from β -cells, suggest a positive feed-back mechanism between ABA and GLP-1, regulating glucose homeostasis. Type 2 diabetes treatments targeting the GLP-1 axis by either inhibiting its rapid clearance by dipeptidyl-peptidase IV or using GLP-1 mimetics are currently used. Moreover, the development of treatments aimed at stimulating GLP-1 release from L cells has been considered as an alternative approach. Accordingly, our finding that ABA increases GLP-1 release in vitro and in vivo may suggest ABA and/or ABA analogs as potential anti-diabetic treatments.
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Affiliation(s)
- Santina Bruzzone
- Department of Experimental Medicine (DIMES), Section of Biochemistry, and CEBR, University of Genova, Genova, Italy
- * E-mail:
| | - Mirko Magnone
- Department of Experimental Medicine (DIMES), Section of Biochemistry, and CEBR, University of Genova, Genova, Italy
| | - Elena Mannino
- Department of Experimental Medicine (DIMES), Section of Biochemistry, and CEBR, University of Genova, Genova, Italy
| | - Giovanna Sociali
- Department of Experimental Medicine (DIMES), Section of Biochemistry, and CEBR, University of Genova, Genova, Italy
| | - Laura Sturla
- Department of Experimental Medicine (DIMES), Section of Biochemistry, and CEBR, University of Genova, Genova, Italy
| | - Chiara Fresia
- Department of Experimental Medicine (DIMES), Section of Biochemistry, and CEBR, University of Genova, Genova, Italy
| | - Valeria Booz
- Department of Experimental Medicine (DIMES), Section of Biochemistry, and CEBR, University of Genova, Genova, Italy
| | - Laura Emionite
- Animal facility, IRCCS AOU San Martino - IST Istituto Nazionale per la Ricerca sul Cancro, Genova, Italy
| | - Antonio De Flora
- Department of Experimental Medicine (DIMES), Section of Biochemistry, and CEBR, University of Genova, Genova, Italy
| | - Elena Zocchi
- Department of Experimental Medicine (DIMES), Section of Biochemistry, and CEBR, University of Genova, Genova, Italy
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59
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Sociali G, Galeno L, Parenti MD, Grozio A, Bauer I, Passalacqua M, Boero S, Donadini A, Millo E, Bellotti M, Sturla L, Damonte P, Puddu A, Ferroni C, Varchi G, Franceschi C, Ballestrero A, Poggi A, Bruzzone S, Nencioni A, Del Rio A. Quinazolinedione SIRT6 inhibitors sensitize cancer cells to chemotherapeutics. Eur J Med Chem 2015; 102:530-9. [DOI: 10.1016/j.ejmech.2015.08.024] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Revised: 08/04/2015] [Accepted: 08/10/2015] [Indexed: 01/09/2023]
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60
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Lanzerstorfer P, Stadlbauer V, Chtcheglova LA, Haselgrübler R, Borgmann D, Wruss J, Hinterdorfer P, Schröder K, Winkler SM, Höglinger O, Weghuber J. Identification of novel insulin mimetic drugs by quantitative total internal reflection fluorescence (TIRF) microscopy. Br J Pharmacol 2015; 171:5237-51. [PMID: 25039620 PMCID: PMC4262000 DOI: 10.1111/bph.12845] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Revised: 06/18/2014] [Accepted: 06/27/2014] [Indexed: 12/25/2022] Open
Abstract
Background and Purpose Insulin stimulates the transport of glucose in target tissues by triggering the translocation of glucose transporter 4 (GLUT4) to the plasma membrane. Resistance to insulin, the major abnormality in type 2 diabetes, results in a decreased GLUT4 translocation efficiency. Thus, special attention is being paid to search for compounds that are able to enhance this translocation process in the absence of insulin. Experimental Approach Total internal reflection fluorescence (TIRF) microscopy was applied to quantify GLUT4 translocation in highly insulin-sensitive CHO-K1 cells expressing a GLUT4-myc-GFP fusion protein. Key Results Using our approach, we demonstrated GLUT4 translocation modulatory properties of selected substances and identified novel potential insulin mimetics. An increase in the TIRF signal was found to correlate with an elevated glucose uptake. Variations in the expression level of the human insulin receptor (hInsR) showed that the insulin mimetics identified stimulate GLUT4 translocation by a mechanism that is independent of the presence of the hInsR. Conclusions and Implications Taken together, the results indicate that TIRF microscopy is an excellent tool for the quantification of GLUT4 translocation and for identifying insulin mimetic drugs.
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Affiliation(s)
- Peter Lanzerstorfer
- School of Engineering and Environmental Sciences, University of Applied Sciences Upper Austria, Wels, Austria
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61
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Magnone M, Ameri P, Salis A, Andraghetti G, Emionite L, Murialdo G, De Flora A, Zocchi E. Microgram amounts of abscisic acid in fruit extracts improve glucose tolerance and reduce insulinemia in rats and in humans. FASEB J 2015; 29:4783-93. [DOI: 10.1096/fj.15-277731] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Accepted: 07/20/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Mirko Magnone
- Department of Experimental MedicineSection of Biochemistry and Center of Excellence for Biomedical ResearchUniversity of GenoaGenoaItaly
| | - Pietro Ameri
- Department of Internal MedicineUniversity of GenoaGenoaItaly
| | - Annalisa Salis
- Department of Experimental MedicineSection of Biochemistry and Center of Excellence for Biomedical ResearchUniversity of GenoaGenoaItaly
| | | | - Laura Emionite
- Animal Facility, Istituto di Ricovero e Cura a Carattere Scientifico, Azienda Ospedaliera Universitaria San Martino, Istituto Scientifico TumoriGenoaItaly
| | | | - Antonio De Flora
- Department of Experimental MedicineSection of Biochemistry and Center of Excellence for Biomedical ResearchUniversity of GenoaGenoaItaly
| | - Elena Zocchi
- Department of Experimental MedicineSection of Biochemistry and Center of Excellence for Biomedical ResearchUniversity of GenoaGenoaItaly
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62
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Differences in Copper Absorption and Accumulation between Copper-Exclusion and Copper-Enrichment Plants: A Comparison of Structure and Physiological Responses. PLoS One 2015. [PMID: 26207743 PMCID: PMC4514476 DOI: 10.1371/journal.pone.0133424] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Differences in copper (Cu) absorption and transport, physiological responses and structural characteristics between two types of Cu-resistant plants, Oenothera glazioviana (Cu-exclusion type) and Elsholtzia haichowensis (Cu-enrichment type), were investigated in the present study. The results indicated the following: (1) After 50 μM Cu treatment, the Cu ratio in the xylem vessels of E. haichowensis increased by 60%. A Cu adsorption experiment indicated that O. glazioviana exhibited greater resistance to Cu, and Cu absorption and the shoot/root ratio of Cu were significantly lower in O. glazioviana than in E. haichowensis. (2) An analysis of the endogenous abscisic acid (ABA) variance and exogenous ABA treatment demonstrated that the ABA levels of both plants did not differ; exogenous ABA treatment clearly reduced Cu accumulation in both plants. (3) The leaf stomatal density of O. glazioviana was significantly less than that of E. haichowensis. Guard cells in E. haichowensis plants were covered with a thick cuticle layer, the epidermal hair was more numerous and longer, and the number of xylem conduits in the root was small. (4) The transpiration rate and the stomatal conductance of O. glazioviana were both significantly lower than those of E. haichowensis, regardless of whether the plants were treated with Cu. Taken together, these results indicate that the differences in the structural characteristics between these two plant species, particularly in the characteristics related to plant transpiration, are important factors that govern whether plants acquire or exclude Cu.
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63
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Pydi SP, Jaggupilli A, Nelson KM, Abrams SR, Bhullar RP, Loewen MC, Chelikani P. Abscisic Acid Acts as a Blocker of the Bitter Taste G Protein-Coupled Receptor T2R4. Biochemistry 2015; 54:2622-31. [PMID: 25844797 DOI: 10.1021/acs.biochem.5b00265] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Bitter taste receptors (T2Rs) belong to the G protein-coupled receptor superfamily. In humans, 25 T2Rs mediate bitter taste sensation. In addition to the oral cavity, T2Rs are expressed in many extraoral tissues, including the central nervous system, respiratory system, and reproductive system. To understand the mechanistic roles of the T2Rs in oral and extraoral tissues, novel blockers or antagonists are urgently needed. Recently, we elucidated the binding pocket of T2R4 for its agonist quinine, and an antagonist and inhibitory neurotransmitter, γ-aminobutyric acid. This structure-function information about T2R4 led us to screen the plant hormone abscisic acid (ABA), its precursor (xanthoxin), and catabolite phaseic acid for their ability to bind and activate or inhibit T2R4. Molecular docking studies followed by functional assays involving calcium imaging confirmed that ABA is an antagonist with an IC50 value of 34.4 ± 1.1 μM. However, ABA precursor xanthoxin acts as an agonist on T2R4. Interestingly, molecular model-guided site-directed mutagenesis suggests that the T2R4 residues involved in quinine binding are also predominantly involved in binding to the novel antagonist, ABA. The antagonist ability of ABA was tested using another T2R4 agonist, yohimbine. Our results suggest that ABA does not inhibit yohimbine-induced T2R4 activity. The discovery of natural bitter blockers has immense nutraceutical and physiological significance and will help in dissecting the T2R molecular pathways in various tissues.
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Affiliation(s)
- Sai P Pydi
- †Department of Oral Biology, University of Manitoba, Winnipeg, MB R3E 0W4, Canada
| | | | - Ken M Nelson
- ∥Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada
| | - Suzanne R Abrams
- ∥Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada
| | - Rajinder P Bhullar
- †Department of Oral Biology, University of Manitoba, Winnipeg, MB R3E 0W4, Canada
| | - Michele C Loewen
- ‡National Research Council of Canada, 110 Gymnasium Place, Saskatoon, SK S7N 0W9, Canada.,§Department of Biochemistry, University of Saskatchewan, 105 Wiggins Road, Saskatoon, SK S7N 5N5, Canada
| | - Prashen Chelikani
- †Department of Oral Biology, University of Manitoba, Winnipeg, MB R3E 0W4, Canada
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64
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Vigliarolo T, Guida L, Millo E, Fresia C, Turco E, De Flora A, Zocchi E. Abscisic acid transport in human erythrocytes. J Biol Chem 2015; 290:13042-52. [PMID: 25847240 DOI: 10.1074/jbc.m114.629501] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Indexed: 11/06/2022] Open
Abstract
Abscisic acid (ABA) is a plant hormone involved in the response to environmental stress. Recently, ABA has been shown to be present and active also in mammals, where it stimulates the functional activity of innate immune cells, of mesenchymal and hemopoietic stem cells, and insulin-releasing pancreatic β-cells. LANCL2, the ABA receptor in mammalian cells, is a peripheral membrane protein that localizes at the intracellular side of the plasma membrane. Here we investigated the mechanism enabling ABA transport across the plasmamembrane of human red blood cells (RBC). Both influx and efflux of [(3)H]ABA occur across intact RBC, as detected by radiometric and chromatographic methods. ABA binds specifically to Band 3 (the RBC anion transporter), as determined by labeling of RBC membranes with biotinylated ABA. Proteoliposomes reconstituted with human purified Band 3 transport [(3)H]ABA and [(35)S]sulfate, and ABA transport is sensitive to the specific Band 3 inhibitor 4,4'-diisothiocyanostilbene-2,2'-disulfonic acid. Once inside RBC, ABA stimulates ATP release through the LANCL2-mediated activation of adenylate cyclase. As ATP released from RBC is known to exert a vasodilator response, these results suggest a role for plasma ABA in the regulation of vascular tone.
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Affiliation(s)
- Tiziana Vigliarolo
- From the Department of Experimental Medicine, Section of Biochemistry, and
| | - Lucrezia Guida
- From the Department of Experimental Medicine, Section of Biochemistry, and
| | - Enrico Millo
- the Center of Excellence for Biomedical Research, University of Genova, Genova 16132, Italy and
| | - Chiara Fresia
- From the Department of Experimental Medicine, Section of Biochemistry, and
| | - Emilia Turco
- the Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino 10126, Italy
| | - Antonio De Flora
- From the Department of Experimental Medicine, Section of Biochemistry, and
| | - Elena Zocchi
- From the Department of Experimental Medicine, Section of Biochemistry, and
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65
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Ameri P, Bruzzone S, Mannino E, Sociali G, Andraghetti G, Salis A, Ponta ML, Briatore L, Adami GF, Ferraiolo A, Venturini PL, Maggi D, Cordera R, Murialdo G, Zocchi E. Impaired increase of plasma abscisic Acid in response to oral glucose load in type 2 diabetes and in gestational diabetes. PLoS One 2015; 10:e0115992. [PMID: 25723556 PMCID: PMC4344322 DOI: 10.1371/journal.pone.0115992] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Accepted: 12/03/2014] [Indexed: 11/18/2022] Open
Abstract
The plant hormone abscisic acid (ABA) is present and active in humans, regulating glucose homeostasis. In normal glucose tolerant (NGT) human subjects, plasma ABA (ABAp) increases 5-fold after an oral glucose load. The aim of this study was to assess the effect of an oral glucose load on ABAp in type 2 diabetes (T2D) subjects. We chose two sub-groups of patients who underwent an oral glucose load for diagnostic purposes: i) 9 treatment-naive T2D subjects, and ii) 9 pregnant women with gestational diabetes (GDM), who underwent the glucose load before and 8–12 weeks after childbirth. Each group was compared with matched NGT controls. The increase of ABAp in response to glucose was found to be abrogated in T2D patients compared to NGT controls. A similar result was observed in the women with GDM compared to pregnant NGT controls; 8–12 weeks after childbirth, however, fasting ABAp and ABAp response to glucose were restored to normal in the GDM subjects, along with glucose tolerance. We also retrospectively compared fasting ABAp before and after bilio-pancreatic diversion (BPD) in obese, but not diabetic subjects, and in obese T2D patients, in which BPD resulted in the resolution of diabetes. Compared to pre-BPD values, basal ABAp significantly increased 1 month after BPD in T2D as well as in NGT subjects, in parallel with a reduction of fasting plasma glucose. These results indicate an impaired hyperglycemia-induced ABAp increase in T2D and in GDM and suggest a beneficial effect of elevated ABAp on glycemic control.
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Affiliation(s)
- Pietro Ameri
- Department of Internal Medicine, University of Genova, Viale Benedetto XV/6, 16132 Genova, Italy
| | - Santina Bruzzone
- Department of Experimental Medicine, Section of Biochemistry and CEBR, University of Genova, Viale Benedetto XV/1, 16132 Genova, Italy
| | - Elena Mannino
- Department of Experimental Medicine, Section of Biochemistry and CEBR, University of Genova, Viale Benedetto XV/1, 16132 Genova, Italy
| | - Giovanna Sociali
- Department of Experimental Medicine, Section of Biochemistry and CEBR, University of Genova, Viale Benedetto XV/1, 16132 Genova, Italy
| | - Gabriella Andraghetti
- Department of Internal Medicine, University of Genova, Viale Benedetto XV/6, 16132 Genova, Italy
| | - Annalisa Salis
- Department of Experimental Medicine, Section of Biochemistry and CEBR, University of Genova, Viale Benedetto XV/1, 16132 Genova, Italy
| | - Monica Laura Ponta
- Department of Internal Medicine, University of Genova, Viale Benedetto XV/6, 16132 Genova, Italy
| | - Lucia Briatore
- Department of Internal Medicine, University of Genova, Viale Benedetto XV/6, 16132 Genova, Italy
| | - Giovanni F. Adami
- Department of surgical sciences and integrated diagnostic, University of Genova, Largo R. Benzi 8, 16132 Genova, Italy
| | | | - Pier Luigi Venturini
- IRCSS San Martino IST, Largo R. Benzi 10, 16132 Genova, Italy
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics and Mother and Child Sciences, University of Genova, Largo P. Daneo, 3, 16132 Genova, Italy
| | - Davide Maggi
- Department of Internal Medicine, University of Genova, Viale Benedetto XV/6, 16132 Genova, Italy
| | - Renzo Cordera
- Department of Internal Medicine, University of Genova, Viale Benedetto XV/6, 16132 Genova, Italy
| | - Giovanni Murialdo
- Department of Internal Medicine, University of Genova, Viale Benedetto XV/6, 16132 Genova, Italy
| | - Elena Zocchi
- Department of Experimental Medicine, Section of Biochemistry and CEBR, University of Genova, Viale Benedetto XV/1, 16132 Genova, Italy
- * E-mail:
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66
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Qi CC, Zhang Z, Fang H, Liu J, Zhou N, Ge JF, Chen FH, Xiang CB, Zhou JN. Antidepressant effects of abscisic acid mediated by the downregulation of corticotrophin-releasing hormone gene expression in rats. Int J Neuropsychopharmacol 2014; 18:pyu006. [PMID: 25552429 PMCID: PMC4360223 DOI: 10.1093/ijnp/pyu006] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Corticotrophin-releasing hormone (CRH) is considered to be the central driving force of the hypothalamic-pituitary-adrenal axis, which plays a key role in the stress response and depression. Clinical reports have suggested that excess retinoic acid (RA) is associated with depression. Abscisic acid (ABA) and RA are direct derivatives of carotenoids and share a similar molecular structure. Here, we proposed that ABA also plays a role in the regulation of CRH activity sharing with the RA signaling pathway. METHODS [3H]-ABA radioimmunoassay demonstrated that the hypothalamus of rats shows the highest concentration of ABA compared with the cortex and the hippocampus under basal conditions. RESULTS Under acute stress, ABA concentrations increased in the serum, but decreased in the hypothalamus and were accompanied by increased corticosterone in the serum and c-fos expression in the hypothalamus. Moreover, chronic ABA administration increased sucrose intake and decreased the mRNA expression of CRH and retinoic acid receptor alpha (RARα) in the hypothalamus of rats. Furthermore, ABA improved the symptom of chronic unpredictable mild stress in model rats, as indicated by increased sucrose intake, increased swimming in the forced swim test, and reduced mRNA expression of CRH and RARα in the rat hypothalamus. In vitro, CRH expression decreased after ABA treatment across different neural cells. In BE(2)-C cells, ABA inhibited a series of retinoid receptor expression, including RARα, a receptor that could facilitate CRH expression directly. CONCLUSIONS These results suggest that ABA may play a role in the pathogenesis of depression by downregulating CRH mRNA expression shared with the RA signaling pathway.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Jiang-Ning Zhou
- CAS Key Laboratory of Brain Function and Diseases, Schol of Life Science, University of Science and Technology of China, Anhui, China (Drs Qi, Zhang, Fang, Liu, Ge, Chen, and J-N Zhou); Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, China (Dr N Zhou); Plant Molecular Biology Laboratory, School of Life Science, University of Science and Technology of China, Anhui, China (Dr Xiang).
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67
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Bellotti M, Salis A, Grozio A, Damonte G, Vigliarolo T, Galatini A, Zocchi E, Benatti U, Millo E. Synthesis, structural characterization and effect on human granulocyte intracellular cAMP levels of abscisic acid analogs. Bioorg Med Chem 2014; 23:22-32. [PMID: 25496807 DOI: 10.1016/j.bmc.2014.11.035] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Revised: 11/11/2014] [Accepted: 11/21/2014] [Indexed: 12/27/2022]
Abstract
The phytohormone abscisic acid (ABA), in addition to regulating physiological functions in plants, is also produced and released by several mammalian cell types, including human granulocytes, where it stimulates innate immune functions via an increase of the intracellular cAMP concentration ([cAMP]i). We synthesized several ABA analogs and evaluated the structure-activity relationship, by the systematical modification of selected regions of these analogs. The resulting molecules were tested for their ability to inhibit the ABA-induced increase of [cAMP]i in human granulocytes. The analogs with modified configurations at C-2' and C-3' abrogated the ABA-induced increase of the [cAMP]i and also inhibited several pro-inflammatory effects induced by exogenous ABA on granulocytes and monocytes. Accordingly, these analogs could be suitable as novel putative anti-inflammatory compounds.
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Affiliation(s)
- Marta Bellotti
- Department of Experimental Medicine, Section of Biochemistry, University of Genoa, Viale Benedetto XV 1, 16132 Genoa, Italy; Center of Excellence for Biomedical Research (CEBR), University of Genoa, Viale Benedetto XV 5, 16132 Genoa, Italy
| | - Annalisa Salis
- Center of Excellence for Biomedical Research (CEBR), University of Genoa, Viale Benedetto XV 5, 16132 Genoa, Italy; Department of Hearth Environmental and Life Science (DISTAV), University of Genoa, Corso Europa 26, 16132 Genoa, Italy
| | - Alessia Grozio
- Department of Experimental Medicine, Section of Biochemistry, University of Genoa, Viale Benedetto XV 1, 16132 Genoa, Italy
| | - Gianluca Damonte
- Department of Experimental Medicine, Section of Biochemistry, University of Genoa, Viale Benedetto XV 1, 16132 Genoa, Italy; Center of Excellence for Biomedical Research (CEBR), University of Genoa, Viale Benedetto XV 5, 16132 Genoa, Italy
| | - Tiziana Vigliarolo
- Department of Experimental Medicine, Section of Biochemistry, University of Genoa, Viale Benedetto XV 1, 16132 Genoa, Italy
| | - Andrea Galatini
- Department of Chemistry and Industrial Chemistry, University of Genoa, Via Dodecaneso 31, 16146 Genoa, Italy
| | - Elena Zocchi
- Department of Experimental Medicine, Section of Biochemistry, University of Genoa, Viale Benedetto XV 1, 16132 Genoa, Italy; Center of Excellence for Biomedical Research (CEBR), University of Genoa, Viale Benedetto XV 5, 16132 Genoa, Italy
| | - Umberto Benatti
- Department of Experimental Medicine, Section of Biochemistry, University of Genoa, Viale Benedetto XV 1, 16132 Genoa, Italy; Center of Excellence for Biomedical Research (CEBR), University of Genoa, Viale Benedetto XV 5, 16132 Genoa, Italy
| | - Enrico Millo
- Department of Experimental Medicine, Section of Biochemistry, University of Genoa, Viale Benedetto XV 1, 16132 Genoa, Italy; Center of Excellence for Biomedical Research (CEBR), University of Genoa, Viale Benedetto XV 5, 16132 Genoa, Italy.
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68
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Preliminary evidence that abscisic acid improves spatial memory in rats. Physiol Behav 2014; 139:231-9. [PMID: 25449403 DOI: 10.1016/j.physbeh.2014.11.053] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 11/13/2014] [Accepted: 11/14/2014] [Indexed: 01/22/2023]
Abstract
Abscisic acid (ABA) is a crucial phytohormone that exists in a wide range of animals, including humans, and has multiple bioactivities. As direct derivatives of carotenoids, ABA and retinoic acid (RA) share similar molecular structures, and RA has been reported to improve spatial memory in rodents. To explore the potential effects of ABA on spatial learning and memory in rodents, 20mg/kg ABA was administered to young rats for 6weeks, and its effects on behaviour performance were evaluated through a series of behavioural tests. ABA pharmacokinetic analysis revealed that the exogenous ABA was distributed widely in the rat brain, characterised by rapid absorption and slow elimination. The behavioural tests showed that ABA increased both the duration spent in the target quadrant and the frequency it was entered in the probe test of the Morris water maze (MWM) and decreased the latency to locate the target quadrant. Moreover, ABA decreased the latency to enter the novel arm in the Y-maze test, accompanied by increases in the total entries and distance travelled in the three arms. However, there were no significant differences between the ABA-treated and control rats in the open field test and elevated plus-maze test. These results preliminarily indicate that ABA improves spatial memory in MWM and exploratory activity in Y-maze in young rats.
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69
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Comparative analysis of maple syrup to other natural sweeteners and evaluation of their metabolic responses in healthy rats. J Funct Foods 2014. [DOI: 10.1016/j.jff.2014.10.001] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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70
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Majka SM, Miller HL, Helm KM, Acosta AS, Childs CR, Kong R, Klemm DJ. Analysis and isolation of adipocytes by flow cytometry. Methods Enzymol 2014; 537:281-96. [PMID: 24480352 DOI: 10.1016/b978-0-12-411619-1.00015-x] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Analysis and isolation of adipocytes via flow cytometry is particularly useful to study their biology. However, the adoption of this technology has often been hampered by the presence of stromal/vascular cells in adipocyte fractions prepared from collagenase-digested adipose tissue. Here, we describe a multistep staining method and gating strategy that effectively excludes stromal contaminants. Initially, we set a gate optimized to the size and internal complexity of adipocytes. Exclusion of cell aggregates is then performed based on fluorescence of a nuclear stain followed by positive selection to collect only those cell events containing lipid droplets. Lastly, negative selection of cells expressing stromal or vascular lineage markers removes any remaining stromal contaminants. These procedures are applicable to simple analysis of adipocytes and their subcellular constituents by flow cytometry as well as isolation of adipocytes by flow sorting.
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Affiliation(s)
- Susan M Majka
- Department of Medicine, Vanderbilt University, Nashville, Tennessee, USA
| | - Heidi L Miller
- Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Karen M Helm
- Cancer Center Flow Cytometry Core, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Alistaire S Acosta
- Cancer Center Flow Cytometry Core, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Christine R Childs
- Cancer Center Flow Cytometry Core, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | | | - Dwight J Klemm
- Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA.
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71
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Grozio A, Gonzalez VM, Millo E, Sturla L, Vigliarolo T, Bagnasco L, Guida L, D'Arrigo C, De Flora A, Salis A, Martin EM, Bellotti M, Zocchi E. Selection and characterization of single stranded DNA aptamers for the hormone abscisic Acid. Nucleic Acid Ther 2013; 23:322-31. [PMID: 23971905 PMCID: PMC3760064 DOI: 10.1089/nat.2013.0418] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The hormone abscisic acid (ABA) is a small molecule involved in pivotal physiological functions in higher plants. Recently, ABA has been also identified as an endogenous hormone in mammals, regulating different cell functions including inflammatory processes, stem cell expansion, insulin release, and glucose uptake. Aptamers are short, single-stranded (ss) oligonucleotidesable to recognize target molecules with high affinity. The small size of the ABA molecule represented a challenge for aptamer development and the aim of this study was to develop specific anti-ABA DNA aptamers. Biotinylated abscisic acid (bio-ABA) was immobilized on streptavidin-coated magnetic beads. DNA aptamers against bio-ABA were selected with 7 iterative rounds of the systematic evolution of ligands by exponential enrichment method (SELEX), each round comprising incubation of the ABA-binding beads with the ssDNA sequences, DNA elution, electrophoresis, and polymerase chain reaction (PCR) amplification. The PCR product was cloned and sequenced. The binding affinity of several clones was determined using bio-ABA immobilized on streptavidin-coated plates. Aptamer 2 and aptamer 9 showed the highest binding affinity, with dissociation constants values of 0.98 ± 0.14 μM and 0.80 ± 0.07 μM, respectively. Aptamers 2 and 9 were also able to bind free, unmodified ABA and to discriminate between different ABA enantiomers and isomers. Our findings indicate that ssDNA aptamers can selectively bind ABA and could be used for the development of ABA quantitation assays.
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Affiliation(s)
- Alessia Grozio
- Department of Experimental Medicine, Section of Biochemistry, University of Genova, Genova, Italy
| | - Victor M. Gonzalez
- Departamento de Bioquímica-Investigación, IRYCIS-Hospital Ramón y Cajal, Madrid, Spain
| | - Enrico Millo
- Center of Excellence for Biomedical Research (CEBR), University of Genova, Genova, Italy
| | - Laura Sturla
- Center of Excellence for Biomedical Research (CEBR), University of Genova, Genova, Italy
| | - Tiziana Vigliarolo
- Department of Experimental Medicine, Section of Biochemistry, University of Genova, Genova, Italy
| | - Luca Bagnasco
- Department of Internal Medicine, University of Genova, Genova, Italy
| | - Lucrezia Guida
- Center of Excellence for Biomedical Research (CEBR), University of Genova, Genova, Italy
| | - Cristina D'Arrigo
- Institute for Macromolecular Studies, National Research Council, Genova, Italy
| | - Antonio De Flora
- Center of Excellence for Biomedical Research (CEBR), University of Genova, Genova, Italy
| | - Annalisa Salis
- Center of Excellence for Biomedical Research (CEBR), University of Genova, Genova, Italy
| | - Elena M. Martin
- Departamento de Bioquímica-Investigación, IRYCIS-Hospital Ramón y Cajal, Madrid, Spain
| | - Marta Bellotti
- Center of Excellence for Biomedical Research (CEBR), University of Genova, Genova, Italy
| | - Elena Zocchi
- Center of Excellence for Biomedical Research (CEBR), University of Genova, Genova, Italy
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72
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Kharenko OA, Polichuk D, Nelson KM, Abrams SR, Loewen MC. Identification and characterization of interactions between abscisic acid and human heat shock protein 70 family members. J Biochem 2013; 154:383-91. [PMID: 23975754 DOI: 10.1093/jb/mvt067] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Abscisic acid (ABA) is a stress-inducible plant hormone comprising an inevitable component of the human diet. Recently, stress-induced accumulation of autocrine ABA was shown in humans, as well as ABA-mediated modulation of a number of disease-associated systems. Now, the application of a chemical proteomics approach to gain further insight into ABA mechanisms of action in mammalian cells is reported. An ABA mimetic photoaffinity probe was applied to intact mammalian insulinoma and embryonic cells, leading to the identification of heat shock protein 70 (HSP70) family members, (including GRP78 and HSP70-2) as putative human ABA-binding proteins. In vitro characterization of the ABA-HSP70 interactions yielded K(d)s in the 20-60 µM range, which decreased several fold in the presence of co-chaperone. However, ABA was found to have only variable- and co-chaperone-independent effects on the ATPase activity of these proteins. The potential implications of these ABA-HSP70 interactions are discussed with respect to the intracellular protein folding and extracellular receptor-like activities of these stress-inducible proteins. While mechanistic and functional relevance remain enigmatic, we conclude that ABA can bind to human HSP70 family members with physiologically relevant affinities and in a co-chaperone-dependent manner.
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Affiliation(s)
- Olesya A Kharenko
- Plant Biotechnology Institute, National Research Council of Canada, 110 Gymnasium Place, Saskatoon, Saskatchewan, S7N 0W9; Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5C9, Canada and Department of Biochemistry, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5E5, Canada
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73
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Tossi V, Cassia R, Bruzzone S, Zocchi E, Lamattina L. ABA says NO to UV-B: a universal response? TRENDS IN PLANT SCIENCE 2012; 17:510-7. [PMID: 22698377 DOI: 10.1016/j.tplants.2012.05.007] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Revised: 04/24/2012] [Accepted: 05/03/2012] [Indexed: 05/21/2023]
Abstract
Abscisic acid (ABA) signaling pathways have been widely characterized in plants, whereas the function of ABA in animals is less well understood. However, recent advances show ABA production by a wide range of lower animals and higher mammals. This enables a new evaluation of ABA signaling pathways in different organisms in response to common environmental stress, such as ultraviolet (UV)-B. In this opinion article, we propose that the induction of common signaling components, such as ABA, nitric oxide (NO) and Ca(2+), in plant and animal cells in response to high doses of UV-B, suggests that the evolution of a general mechanism activated by UV-B is conserved in divergent multicellular organisms challenged by a changing common environment.
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Affiliation(s)
- Vanesa Tossi
- Instituto de Investigaciones Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Mar del Plata, Argentina
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74
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Abscisic acid ameliorates the systemic sclerosis fibroblast phenotype in vitro. Biochem Biophys Res Commun 2012; 422:70-4. [PMID: 22560900 DOI: 10.1016/j.bbrc.2012.04.107] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2012] [Accepted: 04/20/2012] [Indexed: 11/22/2022]
Abstract
The phytohormone abscisic acid (ABA) has been recently identified as an endogenous hormone in humans, regulating different cell functions, including inflammatory processes, insulin release and glucose uptake. Systemic sclerosis (SSc) is a chronic inflammatory disease resulting in fibrosis of skin and internal organs. In this study, we investigated the effect of exogenous ABA on fibroblasts obtained from healthy subjects and from SSc patients. Migration of control fibroblasts induced by ABA was comparable to that induced by transforming growth factor-β (TGF-β). Conversely, migration toward ABA, but not toward TGF-β, was impaired in SSc fibroblasts. In addition, ABA increased cell proliferation in fibroblasts from SSc patients, but not from healthy subjects. Most importantly, presence of ABA significantly decreased collagen deposition by SSc fibroblasts, at the same time increasing matrix metalloproteinase-1 activity and decreasing the expression level of tissue inhibitor of metalloproteinase (TIMP-1). Thus, exogenously added ABA appeared to revert some of the functions altered in SSc fibroblasts to a normal phenotype. Interestingly, ABA levels in plasma from SSc patients were found to be significantly lower than in healthy subjects. UV-B irradiation induced an almost 3-fold increase in ABA content in SSc cultures. Altogether, these results suggest that the fibrotic skin lesions in SSc patients could benefit from exposure to high(er) ABA levels.
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