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Tian S, Yang Y, Wu T, Luo C, Li X, Zhao X, Xi W, Liu X, Zeng M. Functional Characterization of a Flavone Synthase That Participates in a Kumquat Flavone Metabolon. FRONTIERS IN PLANT SCIENCE 2022; 13:826780. [PMID: 35310637 PMCID: PMC8924551 DOI: 10.3389/fpls.2022.826780] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 02/07/2022] [Indexed: 05/17/2023]
Abstract
Flavones predominantly accumulate as O- and C-glycosides in kumquat plants. Two catalytic mechanisms of flavone synthase II (FNSII) support the biosynthesis of glycosyl flavones, one involving flavanone 2-hydroxylase (which generates 2-hydroxyflavanones for C-glycosylation) and another involving the direct catalysis of flavanones to flavones for O-glycosylation. However, FNSII has not yet been characterized in kumquats. In this study, we identified two kumquat FNSII genes (FcFNSII-1 and FcFNSII-2), based on transcriptome and bioinformatics analysis. Data from in vivo and in vitro assays showed that FcFNSII-2 directly synthesized apigenin and acacetin from naringenin and isosakuranetin, respectively, whereas FcFNSII-1 showed no detectable catalytic activities with flavanones. In agreement, transient overexpression of FcFNSII-2 in kumquat peels significantly enhanced the transcription of structural genes of the flavonoid-biosynthesis pathway and the accumulation of several O-glycosyl flavones. Moreover, studying the subcellular localizations of FcFNSII-1 and FcFNSII-2 demonstrated that N-terminal membrane-spanning domains were necessary to ensure endoplasmic reticulum localization and anchoring. Protein-protein interaction analyses, using the split-ubiquitin yeast two-hybrid system and bimolecular fluorescence-complementation assays, revealed that FcFNSII-2 interacted with chalcone synthase 1, chalcone synthase 2, and chalcone isomerase-like proteins. The results provide strong evidence that FcFNSII-2 serves as a nucleation site for an O-glycosyl flavone metabolon that channels flavanones for O-glycosyl flavone biosynthesis in kumquat fruits. They have implications for guiding genetic engineering efforts aimed at enhancing the composition of bioactive flavonoids in kumquat fruits.
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Affiliation(s)
- Shulin Tian
- College of Horticulture and Landscape Architecture, Southwest University, Chongqing, China
- Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, Chongqing, China
| | - Yuyan Yang
- College of Horticulture and Landscape Architecture, Southwest University, Chongqing, China
- Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, Chongqing, China
| | - Tao Wu
- College of Horticulture and Landscape Architecture, Southwest University, Chongqing, China
| | - Chuan Luo
- College of Horticulture and Landscape Architecture, Southwest University, Chongqing, China
| | - Xin Li
- College of Horticulture and Landscape Architecture, Southwest University, Chongqing, China
| | - Xijuan Zhao
- College of Horticulture and Landscape Architecture, Southwest University, Chongqing, China
- Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, Chongqing, China
| | - Wanpeng Xi
- College of Horticulture and Landscape Architecture, Southwest University, Chongqing, China
- Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, Chongqing, China
| | - Xiaogang Liu
- College of Horticulture and Landscape Architecture, Southwest University, Chongqing, China
- Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, Chongqing, China
- *Correspondence: Xiaogang Liu,
| | - Ming Zeng
- College of Horticulture and Landscape Architecture, Southwest University, Chongqing, China
- Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, Chongqing, China
- Ming Zeng, ;
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Pawełczyk A, Żwawiak J, Zaprutko L. Kumquat Fruits as an Important Source of Food Ingredients and Utility Compounds. FOOD REVIEWS INTERNATIONAL 2021. [DOI: 10.1080/87559129.2021.1928179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Anna Pawełczyk
- Department of Organic Chemistry, Pharmaceutical Faculty, Poznan University of Medical Sciences, Poznań, Poland
| | - Justyna Żwawiak
- Department of Organic Chemistry, Pharmaceutical Faculty, Poznan University of Medical Sciences, Poznań, Poland
| | - Lucjusz Zaprutko
- Department of Organic Chemistry, Pharmaceutical Faculty, Poznan University of Medical Sciences, Poznań, Poland
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Kitagawa T, Matsumoto T, Imahori D, Kobayashi M, Okayama M, Ohta T, Yoshida T, Watanabe T. Limonoids isolated from the Fortunella crassifolia and the Citrus junos with their cell death-inducing activity on Adriamycin-treated cancer cell. J Nat Med 2021; 75:998-1004. [PMID: 33991286 DOI: 10.1007/s11418-021-01528-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 05/06/2021] [Indexed: 01/26/2023]
Abstract
From the fruits of Fortunella crassifolia and the peels of Citrus junos, two new limonoids, fortunellone and junosol were isolated together with three known compounds including nomilin. The chemical structures of the new compounds were elucidated based on chemical/physicochemical evidence. For fortunellone, the absolute configuration was established by comparison of experimental and predicted electronic circular dichroism (ECD) data. Fortunellon and nomilin significantly increased the number of dead cells on adriamycin (ADR)-treated human cervical cancer cells (HeLa). On the other hand, fortunellon and nomilin did not affects the number of dead cells alone. These results suggested that fortunellone and nomilin may have the potency as the chemotherapy enhancement agents.
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Affiliation(s)
- Takahiro Kitagawa
- Department of Public Health, Kyoto Pharmaceutical University, Misasagi, Yamashina-ku, Kyoto, 607-8412, Japan
| | - Takahiro Matsumoto
- Department of Public Health, Kyoto Pharmaceutical University, Misasagi, Yamashina-ku, Kyoto, 607-8412, Japan.
| | - Daisuke Imahori
- Department of Public Health, Kyoto Pharmaceutical University, Misasagi, Yamashina-ku, Kyoto, 607-8412, Japan
| | - Mayuka Kobayashi
- Department of Public Health, Kyoto Pharmaceutical University, Misasagi, Yamashina-ku, Kyoto, 607-8412, Japan
| | - Masaya Okayama
- Department of Public Health, Kyoto Pharmaceutical University, Misasagi, Yamashina-ku, Kyoto, 607-8412, Japan
| | - Tomoe Ohta
- Faculty of Pharmaceutical Sciences, Nagasaki International University, Nagasaki, 859-3298, Japan
| | - Tatsusada Yoshida
- Faculty of Pharmaceutical Sciences, Nagasaki International University, Nagasaki, 859-3298, Japan
| | - Tetsushi Watanabe
- Department of Public Health, Kyoto Pharmaceutical University, Misasagi, Yamashina-ku, Kyoto, 607-8412, Japan.
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Oshima T, Takahashi K, Inada A, Yamasaki M, Yamasaki Y, Eto N. Enhanced water dispersibility and permeability through a Caco-2 cell monolayer of β-cryptoxanthin extracted from kumquats by complexation with casein. Food Chem 2021; 360:129822. [PMID: 33984564 DOI: 10.1016/j.foodchem.2021.129822] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 04/14/2021] [Accepted: 04/15/2021] [Indexed: 10/21/2022]
Abstract
β-Cryptoxanthin (BCX) possesses potential therapeutic and health benefits. However, BCX absorption is low because of its poor aqueous solubility. In this study, a complex between BCX and casein (Cas) was prepared to improve the water dispersibility and bioavailability of BCX. BCX was recovered quantitatively from freeze-dried kumquat powder through solid-liquid extraction and saponification. The complexation significantly improved the apparent solubility of BCX under acidic and neutral conditions. A cell membrane permeation test using a Caco-2 cell monolayer was performed to evaluate the bioavailability of the BCX-Cas complex. This complex and a blank sample were digested in vitro and added to the apical side of the Caco-2 cell membrane. The quantity of BCX that permeated using the BCX-Cas complex after 24 h was 22.7 times greater than that of the blank. Thus, complexation of BCX with Cas improved dramatically the bioavailability of BCX from a kumquat extract.
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Affiliation(s)
- Tatsuya Oshima
- Department of Applied Chemistry, Faculty of Engineering, University of Miyazaki, 1-1 Gakuen Kibanadai Nishi, Miyazaki 889-2192, Japan.
| | - Koki Takahashi
- Department of Applied Chemistry, Faculty of Engineering, University of Miyazaki, 1-1 Gakuen Kibanadai Nishi, Miyazaki 889-2192, Japan
| | - Asuka Inada
- Department of Applied Chemistry, Faculty of Engineering, University of Miyazaki, 1-1 Gakuen Kibanadai Nishi, Miyazaki 889-2192, Japan
| | - Masao Yamasaki
- Department of Biochemistry and Applied Biosciences, Faculty of Agriculture, University of Miyazaki, 1-1 Gakuen Kibanadai Nishi, Miyazaki 889-2192, Japan
| | - Yumi Yamasaki
- Faculty of Regional Innovation, University of Miyazaki, 1-1 Gakuen Kibanadai Nishi, Miyazaki 889-2192, Japan
| | - Nozomu Eto
- Department of Biochemistry and Applied Biosciences, Faculty of Agriculture, University of Miyazaki, 1-1 Gakuen Kibanadai Nishi, Miyazaki 889-2192, Japan
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Liu H, Wang ZY, Zhou YC, Song W, Ali U, Sze DMY. Immunomodulation of Chinese Herbal Medicines on NK cell populations for cancer therapy: A systematic review. JOURNAL OF ETHNOPHARMACOLOGY 2021; 268:113561. [PMID: 33157222 DOI: 10.1016/j.jep.2020.113561] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 10/28/2020] [Accepted: 11/02/2020] [Indexed: 06/11/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Immunomodulation has become a crucial modality for cancer treatment. Chinese Herbal Medicines (CHMs) are expected as adjuvant therapy for immunomodulation against cancer, but face the key challenge of poor scientific evidence. Changes of natural killer (NK) cells on numbers and/or cytotoxicity are a novel respect to evaluate the immunomodulation of CHMs. AIM OF THE STUDY The purpose of this review is to investigate the immunomodulation of Chinese Herbal Medicines (CHMs) on NK cell populations for cancer therapy. MATERIALS AND METHODS A systematic review was conducted and outside mainstream electronic databases were screened for potential reference articles. This review tried to report and critically analyzed all the correlative studies, especially these clinical trials (3 CHM extracts and 11 CHM formulas). RESULTS Evidence-based functions of CHMs against cancer could be summarized as: (1) enhancement of NK cells activity or relative percentage; (2) prevention of tumor growth and metastasis; (3) relief on side-effects or complications of therapeutic strategies (i.e. chemotherapy, radiotherapy and resection). Briefly, most of cellular studies and two thirds animal studies were based on the extract or components of single herbs, whilst most of clinical trials were keen on formula or prescription of CHMs. The main components of CHMs were demonstrated active on promoting the cytotoxicity of NK cells, including Angelica sinensis, Ganoderma lucidum, Panax ginseng, Radix Astragali, Lentinus edodes, etc. CONCLUSIONS: This comprehensive review demonstrated NK cells activity was positively associated with quality of life but not survival benefit of cancer patients. Thus exploring the roles of NK cells in adjuvant therapy against cancer is confirmed to be beneficial to explore the underlying relationship between immunomodulation and quality of life.
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Affiliation(s)
- Hao Liu
- Ningbo Key Laboratory of Behavioral Neuroscience, Zhejiang Provincial Key Laboratory of Pathophysiology, Ningbo University School of Medicine, Ningbo, 315211, China.
| | - Zi-Ying Wang
- Bio-X Institutes, Key Laboratory for the Genetics of Development and Neuropsychiatric Disorders (Ministry of Education), Shanghai Key Laboratory of Psychotic Disorders, And Brain Science and Technology Research Center, Institute of Psychology and Behavioral Sciences, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China.
| | - Yu-Cong Zhou
- State Key Laboratory of Microbial Metabolism, And School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Wei Song
- Department of Pharmacy, Renmin Hospital of Wuhan University, Wuhan, 430060, China.
| | - Usman Ali
- Shanghai Jiao Tong University School of Pharmacy, Shanghai, 200240, China.
| | - Daniel M-Y Sze
- School of Health and Biomedical Sciences, RMIT University, Bundoora, VIC, Australia.
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Yanagimichi M, Nishino K, Sakamoto A, Kurodai R, Kojima K, Eto N, Isoda H, Ksouri R, Irie K, Kambe T, Masuda S, Akita T, Maejima K, Nagao M. Analyses of putative anti-cancer potential of three STAT3 signaling inhibitory compounds derived from Salvia officinalis. Biochem Biophys Rep 2020; 25:100882. [PMID: 33392396 PMCID: PMC7772785 DOI: 10.1016/j.bbrep.2020.100882] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 11/17/2020] [Accepted: 12/13/2020] [Indexed: 12/05/2022] Open
Abstract
The extract of Salvia officinalis (Common Sage) exhibited inhibitory activity of STAT3 signal after screening of several plants extracts using the STAT3-responsive reporter system. Cirsiliol, luteolin, and carnosol were identified from the methanol extract of Silvia officinalis as inhibitors of STAT3 signaling and the effects of these three compounds on STAT3 protein or growth inhibition on cancer cells was compared. Luteolin at the dose of 90 μM clearly suppressed the phosphorylation of STAT3 induced by IL-6, while carnosol was prone to decrease total STAT3 proteins at high doses (>90 μM). Cirsiliol had almost no effect. Since the three compounds exhibited similar concentration-dependent suppression patterns in the reporter assay except for cirsiliol became plateau beyond 30 μM, these compounds appeared to function as STAT3 inhibitory factors in different ways. The direct anti-proliferative activity of three compounds was examined with or without the anti-cancer drug gefitinib using HepG2 and A549 cells. The anti-proliferative effect of the three compounds was additively enhanced by gefitinib. At the doses of 3.6 μM, statistically significant suppression of proliferation was observed in HepG2 cells only by cirsiliol among the three compounds in the absence of gefitinib but all three compounds were prone to suppress the proliferation of HepG2 cells and A549 cells dose-dependently although cirsiliol showed a modest dose-dependency and this suppression of proliferation was enhanced by the addition of gefitinib. Cirsiliol, a dimethyoxylated flavone, activated the natural killer activity of KHYG-1 cells against erythroleukemia K562 cells like a hexamethoxylated flavone, nobiletin, suggesting that it may also have an indirect anti-cancer potential through activation of NK cells. These results shed light on the putative anti-cancer potential of Salvia officinalis. Carnosol, luteolin and cirsiliol were identified as STAT3 signal inhibitors in S. officinalis. Cirsiliol inhibited the STAT3-responsive reporter expression at 7.5 μM but showed low dose-dependency at higher doses. Cirsiliol at 90 μM showed almost no effect on phosphorylation of STAT3 and weakly suppressed total STAT3. Cirsiliol exhibited anti-proliferative activity at 3.6 μM against HepG2 cells and A549 cells but showed low dose-dependency. Cirsiliol activated NK cells by stimulating exocytosis of granules for cytolysis.
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Affiliation(s)
- Maho Yanagimichi
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan
| | | | - Akiho Sakamoto
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan
| | - Ryusei Kurodai
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan
| | - Kenji Kojima
- Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
| | - Nozomu Eto
- Interdisciplinary Graduate School of Agriculture and Engineering, University of Miyazaki, Miyazaki, 889-2192, Japan
| | - Hiroko Isoda
- Faculty of Life and Environmental Sciences, University of Tsukuba, Ibaraki, 305-8572, Japan.,Alliance for Research on the Mediterranean and North Africa (ARENA), University of Tsukuba, Ibaraki, 305-8572, Japan
| | - Riadh Ksouri
- Centre de Biotechnologie à la Technopole de Borj Cédria (CBBC), BP 901, 2050, Hammam-lif, Tunisia
| | - Kazuhiro Irie
- Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
| | - Taiho Kambe
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan
| | - Seiji Masuda
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan
| | - Toru Akita
- Nippon Shinyaku CO., LTD., Kyoto, 601-8550, Japan
| | | | - Masaya Nagao
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan
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7
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Teper D, Xu J, Li J, Wang N. The immunity of Meiwa kumquat against Xanthomonas citri is associated with a known susceptibility gene induced by a transcription activator-like effector. PLoS Pathog 2020; 16:e1008886. [PMID: 32931525 PMCID: PMC7518600 DOI: 10.1371/journal.ppat.1008886] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 09/25/2020] [Accepted: 08/14/2020] [Indexed: 12/22/2022] Open
Abstract
Citrus canker caused by Xanthomonas citri subsp. citri (Xcc) is one of the most devastating diseases in citrus. Meiwa kumquat (Fortunella crassifolia) has shown a durable resistance against Xcc. Here, we aimed to characterize the mechanisms responsible for such a durable resistance by characterizing the transcriptional and physiological responses of Meiwa kumquat to Xcc. Inoculation of Meiwa kumquat with Xcc promoted immune responses such as upregulation of PR genes, accumulation of salicylic acid, hypersensitive response (HR)-like cell death and early leaf abscission. Hypertrophy and hyperplasia symptoms, which are known to be caused by Xcc-induction of the canker susceptibility gene LOB1 through the transcription activator-like effector (TALE) PthA4, always appear prior to the development of cell death. Mutation of pthA4 in Xcc abolished the induction of LOB1, canker symptoms, cell death, and leaf abscission and reduced the expression of PR genes in inoculated kumquat leaves without reducing Xcc titers in planta. Transcriptome analysis demonstrated that PthA4 promotes plant biotic and abiotic stress responses and the biosynthesis of abscisic acid. Transcriptional induction of LOB1 homologs in Meiwa kumquat by Xcc pthA4 mutant strains carrying a repertoire of designer TALEs promoted the elicitation of HR-like phenotype and leaf abscission, suggesting that kumquat response to Xcc is associated with upregulation of LOB1. Our study suggests a novel mechanism of plant resistance to Xanthomonas via elicitation of immune responses by upregulation of a host susceptibility gene.
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Affiliation(s)
- Doron Teper
- Citrus Research and Education Center, Department of Microbiology and Cell Science, Institute of Food and Agricultural Sciences, University of Florida, Lake Alfred, United States of America
| | - Jin Xu
- Citrus Research and Education Center, Department of Microbiology and Cell Science, Institute of Food and Agricultural Sciences, University of Florida, Lake Alfred, United States of America
| | - Jinyun Li
- Citrus Research and Education Center, Department of Microbiology and Cell Science, Institute of Food and Agricultural Sciences, University of Florida, Lake Alfred, United States of America
| | - Nian Wang
- Citrus Research and Education Center, Department of Microbiology and Cell Science, Institute of Food and Agricultural Sciences, University of Florida, Lake Alfred, United States of America
- * E-mail:
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8
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Terao R, Murata A, Sugamoto K, Watanabe T, Nagahama K, Nakahara K, Kondo T, Murakami N, Fukui K, Hattori H, Eto N. Immunostimulatory effect of kumquat (Fortunella crassifolia) and its constituents, β-cryptoxanthin andR-limonene. Food Funct 2019; 10:38-48. [DOI: 10.1039/c8fo01971a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The active constituents of kumquat in NK cell activation and anti-stress effects are β-cryptoxanthin andR-limonene.
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Affiliation(s)
- Rina Terao
- Graduate School of Agriculture
- University of Miyazaki
- Miyazaki
- Japan
| | - Akira Murata
- Graduate School of Agriculture
- University of Miyazaki
- Miyazaki
- Japan
| | - Kazuhiro Sugamoto
- Interdisciplinary Graduate School of Agriculture and Engineering
- University of Miyazaki
- Miyazaki
- Japan
| | | | - Kiyoko Nagahama
- Interdisciplinary Graduate School of Agriculture and Engineering
- University of Miyazaki
- Miyazaki
- Japan
| | - Keiko Nakahara
- Department of Veterinary Physiology
- Faculty of Agriculture
- University of Miyazaki
- Miyazaki
- Japan
| | - Tomomi Kondo
- Miyazaki JA Food Research & Development Inc
- Miyazaki
- Japan
| | - Noboru Murakami
- Department of Veterinary Physiology
- Faculty of Agriculture
- University of Miyazaki
- Miyazaki
- Japan
| | - Keiichi Fukui
- Miyazaki JA Food Research & Development Inc
- Miyazaki
- Japan
| | - Hidemi Hattori
- Graduate School of Agriculture
- University of Miyazaki
- Miyazaki
- Japan
- Interdisciplinary Graduate School of Agriculture and Engineering
| | - Nozomu Eto
- Graduate School of Agriculture
- University of Miyazaki
- Miyazaki
- Japan
- Interdisciplinary Graduate School of Agriculture and Engineering
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9
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Effect of Natural Compounds on NK Cell Activation. J Immunol Res 2018; 2018:4868417. [PMID: 30671486 PMCID: PMC6323526 DOI: 10.1155/2018/4868417] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 11/29/2018] [Accepted: 12/04/2018] [Indexed: 02/07/2023] Open
Abstract
Natural killer (NK) cells are lymphocytes of the innate immune system that survey the body for stressed and abnormal cells. The integration of signals that they receive through various inhibitory and activating cell surface receptors controls their activation and ability to kill target cells and produce cytokines. In this manner, phenotypically and functionally distinct subsets of NK cells help protect against microbial infections and cancer and shape the adaptive immune response. NK cells can use two different mechanisms to kill their targets, either by cytotoxic granule exocytosis or by induction of death receptor-mediated apoptosis. Death ligands belong to the tumor necrosis factor (TNF) family of ligands. Upon release in close proximity to a cell slated for killing, perforin forms pores in the cell membrane of the target cell through which granzymes and associated molecules can enter and induce apoptosis. NK cells are also involved in antibody-dependent cellular toxicity via the CD16 receptor. In addition to target recognition, NK cells can be also activated by treatment with multiple compounds with stimulatory properties. Apart from interleukins, which belong to the best characterized group of NK cell-stimulating compounds, vitamins and constituents extracted from plants also display the ability to activate NK cells. The current review characterizes several groups of NK cell-activating compounds: vitamins belonging to classes A, B, C, D, and E, polysaccharides, lectins, and a number of phytochemicals used in cancer research, exhibiting stimulatory properties when applied to NK cells. Although in most cases the exact mechanism of action is not known, constituents described in this review seem to be promising candidates for NK cell-stimulating drugs.
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10
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Nonaka Y, Izumo T, Maekawa T, Shibata H. Anti-stress effect of the Lactobacillus pentosus strain S-PT84 in mice. BIOSCIENCE OF MICROBIOTA FOOD AND HEALTH 2017; 36:121-128. [PMID: 28748133 PMCID: PMC5510157 DOI: 10.12938/bmfh.17-003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Accepted: 04/20/2017] [Indexed: 12/22/2022]
Abstract
We investigated if the orally administered Lactobacillus pentosus strain S-PT84 (S-PT84) might show anti-stress activity and ameliorate stress-induced immune suppression in mice. Stress of mice induced an increase in serum corticosterone and a decrease in splenic natural killer activity and in the number of splenocytes versus control mice. However, these changes were not observed in stressed mice that had been administered S-PT84. Furthermore, interleukin (IL)-12 and IL-10 production, which was downregulated in lipopolysaccharide-activated macrophages from stressed mice, was maintained at control levels in the macrophages of stressed mice that had been fed S-PT84. Interferon-γ production, which was downregulated in concanavalin A-activated splenocytes from stressed mice, tended to be maintained at control levels in stressed mice that had been fed S-PT84, although IL-4 production by these cells was not influenced by S-PT84 administration. Additionally, reduced glutathione (GSH) levels were decreased in serum and peritoneal macrophages from stressed mice versus controls, but these GSH levels were significantly higher in stressed animals that had been administered S-PT84 compared with those that had not. These results suggest that S-PT84 exerts anti-stress activity through immune modulation and/or antioxidative activity.
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Affiliation(s)
- Yuji Nonaka
- Research Institute, Suntory Global Innovation Center Limited, 8-1-1 Seikadai, Seika-cho, Soraku-gun, Kyoto 619-0284, Japan.,Institute for Health Care Science, Suntory Wellness Limited, 8-1-1 Seikadai, Seika-cho, Soraku-gun, Kyoto 619-0284, Japan
| | - Takayuki Izumo
- Institute for Health Care Science, Suntory Wellness Limited, 8-1-1 Seikadai, Seika-cho, Soraku-gun, Kyoto 619-0284, Japan
| | - Toshihiro Maekawa
- Institute for Health Care Science, Suntory Wellness Limited, 8-1-1 Seikadai, Seika-cho, Soraku-gun, Kyoto 619-0284, Japan
| | - Hiroshi Shibata
- Institute for Health Care Science, Suntory Wellness Limited, 8-1-1 Seikadai, Seika-cho, Soraku-gun, Kyoto 619-0284, Japan
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11
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Lou SN, Ho CT. Phenolic compounds and biological activities of small-size citrus: Kumquat and calamondin. J Food Drug Anal 2016; 25:162-175. [PMID: 28911534 PMCID: PMC9333435 DOI: 10.1016/j.jfda.2016.10.024] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 10/29/2016] [Accepted: 10/31/2016] [Indexed: 12/15/2022] Open
Abstract
Kumquat and calamondin are two small-size citrus fruits. Owing to their health benefits, they are traditionally used as folk medicine in Asian countries. However, the research on flavonoids and biological activities of kumquat and calamondin have received less attention. This review summarizes the reported quantitative and qualitative data of phenolic compositions in these two fruits. Effects of maturity, harvest time, various solvent extractions and heat treatment of phenolic compositions, and bioactivities were discussed; distributions of the forms of phenolic compounds existing in kumquat and calamondin were also summarized. Furthermore, biological activities, including antioxidant, anti-tyrosinase, antimicrobial, antitumor, and antimetabolic disorder effects, have also been discussed. Effective phenolic components were proposed for a certain bioactivity. It was found that C-glycoside flavonoids are dominant phenolic compounds in kumquat and calamondin, unlike in other citrus fruits. Up to now, biological activities and chemical characteristics of C-glycoside flavonoids in kumquat and calamondin are largely unknown.
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Affiliation(s)
- Shyi-Neng Lou
- Department of Food Science, National Ilan University, Ilan, Taiwan.
| | - Chi-Tang Ho
- Department of Food Science, Rutgers University, New Brunswick, NJ, USA.
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