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Wang P, Hu J, Min S, Chen C, Zhu Y, Pan Y, Wei D, Wang X. Recombinant Phaseolus vulgaris phytohemagglutinin L-form expressed in the Bacillus brevis exerts in vitro and in vivo anti-tumor activity through potentiation of apoptosis and immunomodulation. Int Immunopharmacol 2023; 120:110322. [PMID: 37269742 DOI: 10.1016/j.intimp.2023.110322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 04/27/2023] [Accepted: 05/08/2023] [Indexed: 06/05/2023]
Abstract
Leukocyte phytohemagglutinin (PHA-L) is a tetrameric isomer of phytohemagglutinin (PHA) purified from the red kidney bean (Phaseolus vulgaris) and is a well-known human lymphocyte mitogen. Due to its antitumor and immunomodulatory effects, PHA-L may serve as a potential antineoplastic agent in future cancer therapeutics. However, various negative consequences of PHA have been reported in the literature as a result of the restricted acquisition methods, including oral toxicity, hemagglutinating activity, and immunogenicity. There is a critical need to explore a new method to obtain PHA-L with high purity, high activity and low toxicity. In this report active recombinant PHA-L protein was successfully prepared by Bacillus brevius expression system, and the antitumor and immunomodulatory activities of recombinant PHA-L were characterized by in vitro and in vivo experiments. The results showed that recombinant PHA-L protein had stronger antitumor effect, and its anti-tumor mechanism was realized through direct cytotoxicity and immune regulation. Importantly, compared with natural PHA-L, the recombinant PHA-L protein showed the lower erythrocyte agglutination toxicity in vitro and immunogenicity in mice. Altogether, our study provides a new strategy and important experimental basis for the development of drugs with dual effects of immune regulation and direct antitumor activity.
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Affiliation(s)
- Peipei Wang
- West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China
| | - Junmei Hu
- West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China
| | - Shitong Min
- West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China
| | - Congliang Chen
- West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China
| | - Yue Zhu
- West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China
| | - Yan Pan
- West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China
| | - Dapeng Wei
- West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China
| | - Xia Wang
- West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China.
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Preparation of a novel monoclonal antibody against active components of PHA-L from Phaseolus vulgaris and its functional characteristics. BMC Biotechnol 2022; 22:32. [PMID: 36309691 PMCID: PMC9618193 DOI: 10.1186/s12896-022-00761-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 10/14/2022] [Indexed: 11/18/2022] Open
Abstract
Background Leukocyte phytohemagglutinin (PHA-L), derived from the L4 tetramer of PHA, has been frequently employed as a mitogen to induce T lymphocyte proliferation in vitro. The biological application of PHA-L in cancer diagnosis and treatment has gained traction in recent years. However, it has been noted that PHA-L obtained using traditional procedures has a massive amount of impurities or toxic components, which interfere with the activity of PHA-L. Preparation of a monoclonal antibody against active PHA-L is a significant tool for studying PHA-L's function and therapeutic potential. Results We successfully prepared monoclonal antibodies against the active components of PHA-L based on the whole PHA-L protein as an antigen, and found that monoclonal antibody 3C1C6G11 can be employed in western blot, immunofluorescence, and immunohistochemistry detection. Importantly, preliminary result shows that the mAb 3C1C6G11 may prevent PHA-L-induced cell aggregation and AICD (activation-induced cell death). Conclusions The monoclonal antibody mAb 3C1C6G11 prepared in this study can be used as an effective tool for detecting PHA-L active components, investigating PHA-L's function and antineoplastic application. Supplementary Information The online version contains supplementary material available at 10.1186/s12896-022-00761-7.
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Peddio S, Padiglia A, Cannea FB, Crnjar R, Zam W, Sharifi-Rad J, Rescigno A, Zucca P. Common bean (Phaseolus vulgaris L.) α-amylase inhibitors as safe nutraceutical strategy against diabetes and obesity: An update review. Phytother Res 2022; 36:2803-2823. [PMID: 35485365 PMCID: PMC9544720 DOI: 10.1002/ptr.7480] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 03/22/2022] [Accepted: 04/14/2022] [Indexed: 12/23/2022]
Abstract
Overweight and obesity are constantly increasing, not only in Western countries but also in low‐middle‐income ones. The decrease of both the intake of carbohydrates and their assimilation are among the main dietary strategies to counter these conditions. α‐Amylase, a key enzyme involved in the digestion of carbohydrates, is the target enzyme to reduce the absorption rate of carbohydrates. α‐Amylase inhibitors (α‐AIs) can be found in plants. The common bean, Phaseolus vulgaris is of particular interest due to the presence of protein‐based α‐AIs which, through a protein–protein interaction, reduce the activity of this enzyme. Here we describe the nature of the various types of common bean seed extracts, the type of protein inhibitors they contain, reviewing the recent Literature about their molecular structure and mechanism of action. We also explore the existing evidence (clinical trials conducted on both animals and humans) supporting the potential benefits of this protein inhibitors from P. vulgaris, also highlighting the urgent need of further studies to confirm the clinical efficacy of the commercial products. This work could contribute to summarize the knowledge and application of P. vulgaris extract as a nutraceutical strategy for controlling unwanted weight gains, also highlighting the current limitations.
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Affiliation(s)
- Stefania Peddio
- Department of Biomedical Sciences (DiSB), Cittadella Universitaria di Monserrato, Cagliari, Italy
| | - Alessandra Padiglia
- Department of Life and Environmental Sciences (DiSVA), Cittadella Universitaria di Monserrato, Cagliari, Italy
| | - Faustina B Cannea
- Department of Life and Environmental Sciences (DiSVA), Cittadella Universitaria di Monserrato, Cagliari, Italy
| | - Roberto Crnjar
- Department of Biomedical Sciences (DiSB), Cittadella Universitaria di Monserrato, Cagliari, Italy
| | - Wissam Zam
- Department of Analytical and Food Chemistry, Faculty of Pharmacy, Al-Wadi International University, Tartous, Syria
| | | | - Antonio Rescigno
- Department of Biomedical Sciences (DiSB), Cittadella Universitaria di Monserrato, Cagliari, Italy
| | - Paolo Zucca
- Department of Biomedical Sciences (DiSB), Cittadella Universitaria di Monserrato, Cagliari, Italy
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Zhang Y, Li J, Wang HH, Li J, Yu Y, Li B, Huang L, Wu C, Liu X. Phytohemagglutinin ameliorates HFD-induced obesity by increasing energy expenditure. J Mol Endocrinol 2021; 67:1-14. [PMID: 33983894 PMCID: PMC8240727 DOI: 10.1530/jme-20-0349] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Accepted: 05/13/2021] [Indexed: 12/01/2022]
Abstract
Despite all modern advances in medicine, there are few reports of effective and safe drugs to treat obesity. Our objective was to screen anti-obesity natural compounds, and to verify whether they can reduce the body weight gain and investigate their molecular mechanisms. By using drug-screening methods, Phytohemagglutinin (PHA) was found to be the most anti-obesity candidate natural compound. Six-week-old C57BL/6J mice were fed with a high-fat diet (HFD) and intraperitoneally injected with 0.25 mg/kg PHA everyday for 8 weeks. The body weight, glucose homeostasis, oxygen consumption and physical activity were assessed. We also measured the heat intensity, body temperature and the gene expression of key regulators of energy expenditure. Prevention study results showed PHA treatment not only reduced the body weight gain but also maintained glucose homeostasis in HFD-fed mice. Further study indicated energy expenditure and uncoupling protein 1 (UCP-1) expression of brown adipose tissue (BAT) and white adipose tissue (WAT) in HFD-fed mice were significantly improved by PHA. In the therapeutic study, a similar effect was observed. PHA inhibited lipid droplet formation and upregulated mitochondrial-related gene expression during adipogenesis in vitro. UCP-1 KO mice displayed no differences in body weight, glucose homeostasis and core body temperature between PHA and control groups. Our results suggest that PHA prevent and treat obesity by increasing energy expenditure through upregulation of BAT thermogenesis.
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Affiliation(s)
- Yunxia Zhang
- Institute of Neuroscience and Translational Medicine, College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, Henan, China
| | - Jin Li
- Institute of Neuroscience and Translational Medicine, College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, Henan, China
| | - Hui-hui Wang
- Institute of Neuroscience and Translational Medicine, College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, Henan, China
| | - Jiao Li
- Institute of Neuroscience and Translational Medicine, College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, Henan, China
| | - Yue Yu
- Institute of Neuroscience and Translational Medicine, College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, Henan, China
| | - Bo Li
- Institute of Neuroscience and Translational Medicine, College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, Henan, China
| | - Li Huang
- Institute of Neuroscience and Translational Medicine, College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, Henan, China
| | - Changjing Wu
- Institute of Neuroscience and Translational Medicine, College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, Henan, China
| | - Xiaomeng Liu
- Institute of Neuroscience and Translational Medicine, College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, Henan, China
- College of Public Health, Xinxiang Medical University, Xinxiang, Henan, China
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Functional Component Isolated from Phaseolus vulgaris Lectin Exerts In Vitro and In Vivo Anti-Tumor Activity Through Potentiation of Apoptosis and Immunomodulation. Molecules 2021; 26:molecules26020498. [PMID: 33477737 PMCID: PMC7832403 DOI: 10.3390/molecules26020498] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 12/25/2020] [Accepted: 01/11/2021] [Indexed: 02/05/2023] Open
Abstract
Phytohemagglutinin (PHA), the lectin purified from red kidney bean (Phaseolus vulgaris), is a well-known mitogen for human lymphocyte. Because it has obvious anti-proliferative and anti-tumor activity, PHA may serve as a potential antineoplastic drug in future cancer therapeutics. However, the literature is also replete with data on detrimental effects of PHA including oral toxicity, hemagglutinating activity, and immunogenicity. There is a critical need to evaluate the functional as well as the toxic components of PHAs to assist the rational designs of treatment with it. In this report, we performed SDS-PAGE to identify components of PHA-L, the tetrameric isomer of PHA with four identical L-type subunits, and then characterized biological function or toxicity of the major protein bands through in vitro experiments. It was found that the protein appearing as a 130 kD band in SDS-PAGE gel run under the condition of removal of β-mercaptoethanol from the sample buffer together with omission of a heating step could inhibit tumor cell growth and stimulate lymphocyte proliferation, while most of the 35 kD proteins are likely non-functional impurity proteins and 15 kD protein may be related to hemolytic effect. Importantly, the 130 kD functional protein exhibits promising in vivo anti-tumor activity in B16-F10 melanoma C57 BL/6 mouse models, which may be achieved through potentiation of apoptosis and immunomodulation. Altogether, our results suggest that PHA-L prepared from crude extracts of red kidney bean by standard strategies is a mixture of many ingredients, and a 130 kD protein of PHA-L was purified and identified as the major functional component. Our study may pave the way for PHA-L as a potential anticancer drug.
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Lalitha N, Sadashivaiah B, Talahalli RR, Singh SA. Lectin rich horsegram protein and myricetin activates insulin signaling – A study targeting PTP1β. J Funct Foods 2020. [DOI: 10.1016/j.jff.2020.103845] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
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Cominelli E, Galimberti M, Pongrac P, Landoni M, Losa A, Paolo D, Daminati MG, Bollini R, Cichy KA, Vogel-Mikuš K, Sparvoli F. Calcium redistribution contributes to the hard-to-cook phenotype and increases PHA-L lectin thermal stability in common bean low phytic acid 1 mutant seeds. Food Chem 2020; 321:126680. [PMID: 32247181 DOI: 10.1016/j.foodchem.2020.126680] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 03/16/2020] [Accepted: 03/21/2020] [Indexed: 11/27/2022]
Abstract
Seed phytic acid reduces mineral bioavailability by chelating minerals. Consumption of common bean seeds with the low phytic acid 1 (lpa1) mutation improved iron status in human trials but caused adverse gastrointestinal effects, presumably due to increased stability of lectin phytohemagglutinin L (PHA-L) compared to the wild type (wt). A hard-to-cook (HTC) defect observed in lpa1 seeds intensified this problem. We quantified the HTC phenotype of lpa1 common beans with three genetic backgrounds. The HTC phenotype in the lpa1 black bean line correlated with the redistribution of calcium particularly in the cell walls, providing support for the "phytase-phytate-pectin" theory of the HTC mechanism. Furthermore, the excess of free cations in the lpa1 mutation in combination with different PHA alleles affected the stability of PHA-L lectin.
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Affiliation(s)
- Eleonora Cominelli
- Institute of Agricultural Biology and Biotechnology, CNR, Via Bassini 15, 20133 Milan, Italy.
| | - Michela Galimberti
- Institute of Agricultural Biology and Biotechnology, CNR, Via Bassini 15, 20133 Milan, Italy
| | - Paula Pongrac
- Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Michela Landoni
- Department of Biosciences, University of Milan, Via Celoria 26, 20133 Milan, Italy.
| | - Alessia Losa
- Institute of Agricultural Biology and Biotechnology, CNR, Via Bassini 15, 20133 Milan, Italy.
| | - Dario Paolo
- Institute of Agricultural Biology and Biotechnology, CNR, Via Bassini 15, 20133 Milan, Italy.
| | - Maria Gloria Daminati
- Institute of Agricultural Biology and Biotechnology, CNR, Via Bassini 15, 20133 Milan, Italy.
| | - Roberto Bollini
- Institute of Agricultural Biology and Biotechnology, CNR, Via Bassini 15, 20133 Milan, Italy.
| | - Karen A Cichy
- Sugarbeet and Bean Research Unit, Agricultural Research Service, US Department of Agriculture, 1066 Bogue Street, Michigan State University, East Lansing, MI 48824, United States.
| | - Katarina Vogel-Mikuš
- Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia; University of Ljubljana, Biotechnical Faculty, Department of Biology, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia.
| | - Francesca Sparvoli
- Institute of Agricultural Biology and Biotechnology, CNR, Via Bassini 15, 20133 Milan, Italy.
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Sun Y, Liu J, Huang Y, Li M, Lu J, Jin N, He Y, Fan B. Phytohemagglutinin content in fresh kidney bean in China. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2019. [DOI: 10.1080/10942912.2019.1590399] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Yufeng Sun
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences / Key Laboratory of Agro-products Quality and Safety Control in Storage and Transport Process, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Jiameng Liu
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences / Key Laboratory of Agro-products Quality and Safety Control in Storage and Transport Process, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Yatao Huang
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences / Key Laboratory of Agro-products Quality and Safety Control in Storage and Transport Process, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Minmin Li
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences / Key Laboratory of Agro-products Quality and Safety Control in Storage and Transport Process, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Jia Lu
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences / Key Laboratory of Agro-products Quality and Safety Control in Storage and Transport Process, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Nuo Jin
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences / Key Laboratory of Agro-products Quality and Safety Control in Storage and Transport Process, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Yan He
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences / Key Laboratory of Agro-products Quality and Safety Control in Storage and Transport Process, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Bei Fan
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences / Key Laboratory of Agro-products Quality and Safety Control in Storage and Transport Process, Ministry of Agriculture and Rural Affairs, Beijing, China
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Skrzypek T, Szymańczyk S, Ferenc K, Kazimierczak W, Szczepaniak K, Zabielski R. The contribution of vacuolated foetal-type enterocytes in the process of maturation of the small intestine in piglets. Invited review. JOURNAL OF ANIMAL AND FEED SCIENCES 2018. [DOI: 10.22358/jafs/94167/2018] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Alatorre-Cruz JM, Pita-López W, López-Reyes RG, Ferriz-Martínez RA, Cervantes-Jiménez R, de Jesús Guerrero Carrillo M, Vargas PJA, López-Herrera G, Rodríguez-Méndez AJ, Zamora-Arroyo A, Gutiérrez-Sánchez H, de Souza TR, Blanco-Labra A, García-Gasca T. Effects of intragastrically-administered Tepary bean lectins on digestive and immune organs: Preclinical evaluation. Toxicol Rep 2017; 5:56-64. [PMID: 29276690 PMCID: PMC5738237 DOI: 10.1016/j.toxrep.2017.12.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 10/01/2017] [Accepted: 12/08/2017] [Indexed: 11/22/2022] Open
Abstract
Previous work showed that Tepary bean (Phaseolus acutifolius) lectins exhibit differential cytotoxic effects on cancer cell lines by apoptosis induction. In vivo studies using a Tepary bean lectin fraction (TBLF, 50 mg/kg of body weight) after colon cancer induction in rats showed that TBLF inhibited early precancerous lesions without systemic toxicity however, loss of body weight gain and activation of immune cells were observed. In order to know more about the possible adverse effects, we evaluated the administration of TBLF on digestive and immune organs. Sprague Dawley rats were administered TBLF for six weeks and allowed to recover for two weeks. Immune activation was observed through an increased lymphocyte-granulocyte ratio, an increased number of lymphoid follicles in intestinal Peyer's patches and a slight expansion of the splenic white pulp. Atrophy was observed in small intestine villi and crypt foci of the colon without normalization after the recovery period. Pancreas histopathology showed hypertrophy after the six-week administration period, particularly vacuolation and trabecular widening; but after the two-week recovery period atrophy was observed, suggesting a partial compensatory type process. Our results show that TBLF activates the immune system and affects digestive organs through direct interaction with intestinal epithelium, and indirectly by producing pancreatic hyperfunction. Further work will focus in longer recuperation periods after TBLF treatment.
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Affiliation(s)
| | | | | | | | | | | | | | - Gabriela López-Herrera
- Unidad de Investigación en Inmunodeficiencias, Instituto Nacional de Pediatría, Ciudad de México, Mexico
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Gupta RK, Gupta K, Sharma A, Das M, Ansari IA, Dwivedi PD. Health Risks and Benefits of Chickpea (Cicer arietinum) Consumption. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:6-22. [PMID: 27779388 DOI: 10.1021/acs.jafc.6b02629] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Chickpeas (CPs) are one of the most commonly consumed legumes, especially in the Mediterranean area as well as in the Western world. Being one of the most nutritional elements of the human diet, CP toxicity and allergy have raised health concerns. CPs may contain various antinutritional compounds, including protease inhibitors, phytic acid, lectins, oligosaccharides, and some phenolic compounds that may impair the utilization of the nutrients by people. Also, high consumption rates of CPs have enhanced the allergic problems in sensitive individuals as they contain many allergens. On the other hand, beneficial health aspects of CP consumption have received attention from researchers recently. Phytic acid, lectins, sterols, saponins, dietary fibers, resistant starch, oligosaccharides, unsaturated fatty acids, amylase inhibitors, and certain bioactive compounds such as carotenoids and isoflavones have shown the capability of lowering the clinical complications associated with various human diseases. The aim of this paper is to unravel the health risks as well as health-promoting aspects of CP consumption and to try to fill the gaps that currently exist. The present review also focuses on various prevention strategies to avoid health risks of CP consumption using simple but promising ways.
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Affiliation(s)
- Rinkesh Kumar Gupta
- Food Toxicology Laboratory, Food, Drug and Chemical Toxicology Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR) , Vishvigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow 226 001, Uttar Pradesh, India
- Department of Biosciences, Integral University , Kursi Road, Lucknow 226 026, India
| | - Kriti Gupta
- Food Toxicology Laboratory, Food, Drug and Chemical Toxicology Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR) , Vishvigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow 226 001, Uttar Pradesh, India
| | - Akanksha Sharma
- Food Toxicology Laboratory, Food, Drug and Chemical Toxicology Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR) , Vishvigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow 226 001, Uttar Pradesh, India
- Academy of Scientific and Innovative Research (AcSIR) , CSIR-IITR Campus, Lucknow 226 001, India
| | - Mukul Das
- Food Toxicology Laboratory, Food, Drug and Chemical Toxicology Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR) , Vishvigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow 226 001, Uttar Pradesh, India
| | - Irfan Ahmad Ansari
- Department of Biosciences, Integral University , Kursi Road, Lucknow 226 026, India
| | - Premendra D Dwivedi
- Food Toxicology Laboratory, Food, Drug and Chemical Toxicology Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR) , Vishvigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow 226 001, Uttar Pradesh, India
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Lorrai I, Piga V, Carai MAM, Riva A, Morazzoni P, Gessa GL, Colombo G, Maccioni P. A Phaseolus vulgaris Extract Reduces Cue-Induced Reinstatement of Chocolate Seeking in Rats. Front Pharmacol 2016; 7:109. [PMID: 27199752 PMCID: PMC4845070 DOI: 10.3389/fphar.2016.00109] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Accepted: 04/11/2016] [Indexed: 01/03/2023] Open
Abstract
Previous evidence has suggested that treatment with a standardized dry extract of Phaseolus vulgaris reduced intake and operant self-administration of highly palatable foods and fluids in rats and mice. The present study was designed to assess whether such extract was also effective in reducing seeking behavior for a highly hedonic chocolate-flavored beverage, using a "reinstatement" procedure adopted from the drug addiction research field and modeling relapse behavior. Rats were initially trained to lever-respond for the chocolate-flavored beverage under the Fixed Ratio (FR) 10 schedule of reinforcement. Subsequently, rats were exposed to an extinction responding phase, during which lever-responding - being unreinforced - diminished progressively up to extinction. Lever-responding was then powerfully reinstated by the non-contingent presentation of a complex of gustatory, olfactory, auditory, and visual stimuli previously associated to the availability of the chocolate-flavored beverage. Acute, intragastric administration of P. vulgaris dry extract (100 and 500 mg/kg) reduced lever-responding by 40-45%, in comparison to vehicle condition. These results indicate the ability of P. vulgaris dry extract to reduce seeking behavior for a highly palatable nourishment in an experimental model of relapse into disordered eating of palatable foods. The unavailability of the chocolate-flavored beverage in the reinstatement session tends to exclude that the observed effect of the P. vulgaris dry extract was secondary to any inhibition of carbohydrate metabolism; conversely, it is the likely consequence on a central action on the rewarding and hedonic properties of food.
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Affiliation(s)
- Irene Lorrai
- Neuroscience Institute, National Research Council of Italy, Section of Cagliari Cagliari, Italy
| | - Valentina Piga
- Neuroscience Institute, National Research Council of Italy, Section of Cagliari Cagliari, Italy
| | | | | | | | - Gian Luigi Gessa
- Neuroscience Institute, National Research Council of Italy, Section of Cagliari Cagliari, Italy
| | - Giancarlo Colombo
- Neuroscience Institute, National Research Council of Italy, Section of Cagliari Cagliari, Italy
| | - Paola Maccioni
- Neuroscience Institute, National Research Council of Italy, Section of Cagliari Cagliari, Italy
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de Almeida MEF, Simão AA, Corrêa AD, de Barros Fernandes RV. Improvement of physiological parameters of rats subjected to hypercaloric diet, with the use of Pereskia grandifolia (Cactaceae) leaf flour. Obes Res Clin Pract 2015; 10:701-709. [PMID: 26616446 DOI: 10.1016/j.orcp.2015.10.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Revised: 10/13/2015] [Accepted: 10/30/2015] [Indexed: 01/31/2023]
Abstract
OBJECTIVE The aim of the present study was to investigate the anti-obesity effects of Pereskia grandifolia leaf flour on rats fed a hypercaloric diet. METHODS After a hypercaloric diet for 10 weeks, 21 animals were divided into the following groups and were fed the following diets for 4 weeks: control (CH), hypercaloric diet with P. grandifolia flour (PGF) 5%, and hypercaloric diet with PGF 10%. Several measurements were performed including body weight, food consumption, body mass index, Lee index, liver weight, liver and body moisture content, and body and hepatic lipid level. Data were analyzed by Tukey's test at 5% probability. RESULTS Rats fed PGF diet had decreased food consumption and body weight and showed lower body mass and Lee indices compared to control group. At week 2, weight of the PGF 10% group was statistically lower than the control group (CH). At week 4, the PGF 10% group demonstrated the highest body weight loss compared to the other two groups. There were no significant difference in total lipids and moisture level between the groups; however, rats fed PGF diet had lower hepatic lipids levels than control group and reduced liver weight. CONCLUSION This suggests that PGF induced weight loss and decreased hepatic lipid level and may be effective in treating obesity and related metabolic diseases.
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Nciri N, Cho N, Bergaoui N, El Mhamdi F, Ben Ammar A, Trabelsi N, Zekri S, Guémira F, Ben Mansour A, Sassi FH, Ben Aissa-Fennira F. Effect of White Kidney Beans (Phaseolus vulgaris L. var. Beldia) on Small Intestine Morphology and Function in Wistar Rats. J Med Food 2015; 18:1387-99. [PMID: 26488416 DOI: 10.1089/jmf.2014.0193] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The chronic ingestion of raw or undercooked kidney beans (Phaseolus vulgaris L.) causes functional and morphological derangement in various tissues. The major objectives of this study were to investigate the gavage effects of a raw Beldia bean variety that is widely consumed in Tunisia, on the small intestine morphology and jejunal absorption of water, electrolytes, and glucose in Wistar rats. Twenty young male rats were randomly divided into two groups of 10 rats. The first group served as the control and was gavaged with 300 mg of a rodent pellet flour suspension (RPFS), whereas the second experimental group was challenged with 300 mg of a Beldia bean flour suspension (BBFS) for 10 days. Histological studies were performed using light and electron microcopy. The intestinal transport of water, sodium, potassium, and glucose was studied by perfusing the jejunal loops of the small bowels in vivo. The feeding experiments indicated that BBFS did not affect weight gain. Histomorphometric analyses showed that the villus heights, crypt depths, and crypt/villus ratios in the jejunum and ileum were greater in the BBFS-fed rats than controls. Electron microscopy studies demonstrated that the rats exposed to RPFS exhibited intact intestinal tracts; however, the BBFS-treated rats demonstrated intestinal alterations characterized by abnormal microvillus architectures, with short and dense or long and slender features, in addition to the sparse presence of vesicles near the brush border membrane. BBFS administration did not significantly affect glucose absorption. However, significant decreases were observed in water and electrolyte absorption compared with the uptake of the controls. In conclusion, raw Beldia beans distorted jejunum morphology and disturbed hydroelectrolytic flux.
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Affiliation(s)
- Nader Nciri
- 1 Intestinal Immunophysiology-Research Unit (02/RU/09-02), Faculty of Medicine of Tunis, University of Tunis El Manar , Bab Saâdoun, Tunis, Tunisia .,2 Department of Animal Resources, Fisheries, and Food Technology, National Institute of Agronomy of Tunisia , El Mahrajène, Tunis, Tunisia .,3 School of Energy, Materials, and Chemical Engineering, Korea University of Technology and Education , Cheonan, Chungnam, Korea
| | - Namjun Cho
- 3 School of Energy, Materials, and Chemical Engineering, Korea University of Technology and Education , Cheonan, Chungnam, Korea
| | - Nacef Bergaoui
- 1 Intestinal Immunophysiology-Research Unit (02/RU/09-02), Faculty of Medicine of Tunis, University of Tunis El Manar , Bab Saâdoun, Tunis, Tunisia
| | - Faiçal El Mhamdi
- 1 Intestinal Immunophysiology-Research Unit (02/RU/09-02), Faculty of Medicine of Tunis, University of Tunis El Manar , Bab Saâdoun, Tunis, Tunisia
| | - Aouatef Ben Ammar
- 4 Common Services Unit on Transmission Electron Microscopy, Faculty of Medicine of Tunis, University of Tunis El Manar , Bab Saâdoun, Tunis, Tunisia
| | - Najoua Trabelsi
- 5 Clinical Biochemistry Laboratory, Salah Azaiez Institute of Carcinology , Bab Saâdoun, Tunis, Tunisia
| | - Sami Zekri
- 1 Intestinal Immunophysiology-Research Unit (02/RU/09-02), Faculty of Medicine of Tunis, University of Tunis El Manar , Bab Saâdoun, Tunis, Tunisia
| | - Fathi Guémira
- 5 Clinical Biochemistry Laboratory, Salah Azaiez Institute of Carcinology , Bab Saâdoun, Tunis, Tunisia
| | - Abderraouf Ben Mansour
- 1 Intestinal Immunophysiology-Research Unit (02/RU/09-02), Faculty of Medicine of Tunis, University of Tunis El Manar , Bab Saâdoun, Tunis, Tunisia
| | - Fayçal Haj Sassi
- 1 Intestinal Immunophysiology-Research Unit (02/RU/09-02), Faculty of Medicine of Tunis, University of Tunis El Manar , Bab Saâdoun, Tunis, Tunisia
| | - Fatma Ben Aissa-Fennira
- 1 Intestinal Immunophysiology-Research Unit (02/RU/09-02), Faculty of Medicine of Tunis, University of Tunis El Manar , Bab Saâdoun, Tunis, Tunisia
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Pusztai A, Bardocz S, Ewen S. Plant Lectins for Oral Drug Delivery to Different Parts of the Gastrointestinal Tract. ACTA ACUST UNITED AC 2013. [DOI: 10.1201/b14099-15] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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Direct anthelmintic and immunostimulatory effects of oral dosing semi-purified phytohaemagglutinin lectin in sheep infected with Teladorsagia circumcincta and Trichostrongylus colubriformis. Vet Parasitol 2012; 187:267-74. [DOI: 10.1016/j.vetpar.2012.01.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2011] [Revised: 12/19/2011] [Accepted: 01/02/2012] [Indexed: 11/20/2022]
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Multiple cycles of repeated treatments with a Phaseolus vulgaris dry extract reduce food intake and body weight in obese rats. Br J Nutr 2011; 106:762-8. [DOI: 10.1017/s0007114511000778] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Previous lines of experimental evidence have suggested that Phaseolus vulgaris extracts reduce food intake, body weight, lipid accumulation, hedonic properties of food, carbohydrate absorption and metabolism, and glycaemia in rats. The present study was designed to assess the effect of multiple cycles of repeated treatments with a standardised P. vulgaris dry extract on daily food intake and body weight in genetically obese Zucker fa/fa rats (Expt 1). Additionally, the study tested the effect of acute treatment with P. vulgaris dry extract on postprandial glycaemia in Zucker fa/fa rats (Expt 2). In Expt 1, P. vulgaris dry extract was administered daily, at doses of 50 and 500 mg/kg, in three 5 d treatment periods followed by three 20 d off-treatment periods. Administration of P. vulgaris dry extract resulted in dose-dependent decreases in daily food intake and body weight in each treatment phase. Reductions in food intake were of comparable magnitude in each treatment phase. In Expt 2, food-deprived rats were acutely treated with 50 and 500 mg P. vulgaris dry extract per kg immediately before access to a fixed amount of a starch-enriched chow. Treatment with P. vulgaris dry extract resulted in a dose-dependent suppression of glycaemia. These results extend previous data on the anorectic and hypoglycaemic effects of the P. vulgaris dry extract to a validated animal model of obesity. Together with data published previously in the literature, these results strengthen the hypothesis that potentially effective, novel pharmacotherapies for obesity and related disorders may originate from extracts and derivatives of P. vulgaris.
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Carai MAM, Fantini N, Loi B, Colombo G, Riva A, Morazzoni P. Potential efficacy of preparations derived from Phaseolus vulgaris in the control of appetite, energy intake, and carbohydrate metabolism. Diabetes Metab Syndr Obes 2009; 2:145-53. [PMID: 21437128 PMCID: PMC3048011 DOI: 10.2147/dmsott.s4236] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Preclinical data on extracts of and preparations derived from beans of Phaseolus vulgaris are reviewed as potential remedies for use in controlling food consumption, body weight, lipid accumulation, and glycemia. A growing body of evidence suggests that acute and chronic administration of P. vulgaris derivatives reduces food intake (including highly palatable foods), body weight, lipid deposit, and glycemia in rats exposed to multiple experimental procedures. Two possible lectin-mediated mechanisms of action have been proposed: (a) inhibition of α-amylase, resulting in a reduced carbohydrate metabolism and absorption; (b) phytohemoagglutinin-induced modulation of the activity of cholecystokinin and glucagon-like peptides, resulting in a reduced appetite. Preliminary clinical data, as well as reports focusing on the use of several traditional medicines, apparently extend these findings to humans. Should these initial clinical data be confirmed by future surveys, P. vulgaris derivatives might constitute novel remedies for the treatment of obesity and metabolic syndrome. Future studies are also expected to identify active structures leading to the development of new pharmaceutical agents.
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Affiliation(s)
- Mauro AM Carai
- C.N.R. Institute of Neuroscience, Cagliari, Italy
- Correspondence: Mauro AM Carai, C.N.R. Institute of Neuroscience, Viale Diaz 182, I-09126 Cagliari (CA), Italy, Tel +39 070 302227, Tel +39 070 302076, Email
| | | | - Barbara Loi
- C.N.R. Institute of Neuroscience, Cagliari, Italy
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Carvalho AFU, Portela MCC, Sousa MB, Martins FS, Rocha FC, Farias DF, Feitosa JPA. Physiological and physico-chemical characterization of dietary fibre from the green seaweed Ulva fasciata Delile. BRAZ J BIOL 2009; 69:969-77. [DOI: 10.1590/s1519-69842009000400028] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2008] [Accepted: 08/20/2008] [Indexed: 11/22/2022] Open
Abstract
This work aims to assess the potential of the green seaweed Ulva fasciata Delile as an alternative source of dietary fibre (DF). Total DF content was determined, some of its physico-chemical properties described and the physiological effects of U. fasciata meal on rats fed a hypercholesterolemic diet were investigated. U. fasciata may be considered a potential alternative source of DF with a total content of about 400 g.kg-1 (dry basis) and interesting physico-chemical properties: water retention capacity of 8.74 g/water.g-1 dry sample (seaweed meal) and 0.90 (seaweed carbohydrate extract), lipid adsorption capacity of 4.52 g/oil.g-1 dry sample (seaweed meal) and 5.70 (seaweed carbohydrate extract), intrinsic viscosity of 2.4 dl.g-1 (seaweed carbohydrate extract) and cation exchange capacity of 3.51 Eq.kg-1 (seaweed carbohydrate extract). The diet containing seaweed meal was able to keep rats' total cholesterol (TC) down without causing any undesirable increase in LDL-C fraction. No evidence of toxic and/or antinutritional components in the seaweed meal was detected. Rats showed a fecal volume much greater (13 g) than that fed on cellulose diet ( 7 g) (p < 0.05). These properties confer on the seaweed the potential to be used in food technology for the acquisition of low-calorie food and might be important in body weight control, reduction of blood TC and LDL-C as well as in prevention of gastrointestinal diseases.
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Affiliation(s)
| | | | - MB. Sousa
- Universidade Federal do Ceará, Brazil
| | | | - FC. Rocha
- Universidade Federal do Ceará, Brazil
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Baintner K, Bodnár Z, Kiss P, Kiss AL, Lukáts A. Effect of intraperitoneally administered plant lectins on leukocyte diapedesis and visceral organ weight in rats and mice. Pathol Oncol Res 2007; 13:139-43. [PMID: 17607375 DOI: 10.1007/bf02893489] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2006] [Accepted: 03/22/2007] [Indexed: 10/21/2022]
Abstract
The effects of intraperitoneally administered plant lectins were examined in rats and mice. Intraperitoneally injected ConA transiently decreased the leukocyte count in the peritoneal cavity, due to the agglutination and attachment of cells to the peritoneal lining. Subsequently the total cell count was increased for hours, exceeding initial values. Peritoneal fluid aspartate transaminase (AST) concentration showed little change during the accumulation of ascitic fluid. The most marked histological alterations were found when wheat germ lectin was injected ip. (WGA, 10 mg/kg, 6 h). Neutrophil granulocytes migrated across the wall of both arterioles and venules, but the response was highly variable among adjacent vessels. The wall of the arterioles may have impeded the migration of neutrophil granulocytes, resulting in their accumulation in the muscular layer. Granulocyte accumulation was also observed in patches under the mesothelium and in other sites of the interstitium. Marked dilatation and thrombosis of a few venules were also observed. Kidney bean lectin (PHA) induced similar but less pronounced changes. The neutrophil diapedesis suggests the release of mediator(s) from mesothelial cells and/or peritoneal white cells. The cytokine-induced neutrophil chemoattractant CINC-1, injected as control, resulted in the diapedesis of predominantly mononuclear cells in the omentum within 40 minutes. In rats ip. injected ConA increased the wet weight of spleen and liver within 6 and 10 h, respectively, but kidney weight did not change. Intravascular clumping of red blood cells, thrombosis and organ weight changes also suggest the absorption of ConA into the circulation. The experiments show that plant lectins, used as models of bacterial lectins, can reproduce some aspects of peritonitis.
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Affiliation(s)
- Károly Baintner
- Department of Physiology, Faculty of Animal Science, University of Kaposvár, Kaposvár, H-7401, Hungary.
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Linderoth A, Prykhod'ko O, Ahrén B, Fåk F, Pierzynowski SG, Weström BR. Binding and the effect of the red kidney bean lectin, phytohaemagglutinin, in the gastrointestinal tract of suckling rats. Br J Nutr 2007; 95:105-15. [PMID: 16441922 DOI: 10.1079/bjn20051612] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Enteral exposure of suckling rats to phytohaemagglutinin (PHA) has been shown to induce growth and precocious functional maturation of the gastrointestinal tract. The aim of the present study was to explore the mechanism of this action. Suckling rats, 14d old, were fed a single dose of PHA (0·05mg/g body weight) or saline. The binding of PHA to the gut epithelium and its effect on the morphology and functional properties of the gut and pancreas were studied up to 3d after treatment. Initially, at 1–24h, the PHA bound along the gut mucosal lining, resulting in disturbed gut morphology with villi shortening and rapid decreases in disaccharidase activities and macromolecular absorption capacity. During a later phase, between 1 and 3d, the PHA binding had declined, and an uptake by enterocytes was observed. An increase in crypt cell proliferation and gut growth became evident during this period, together with a functional maturation, as indicated by increases in disaccharidase (maltase and sucrase) activities and the low macromolecular absorption capacity. Pancreas growth also increased, as did its content of digestive enzymes. We conclude that enteral exposure to PHA in suckling rats temporarily causes mucosal disarrangement and functional impediment of the gut, which may be explained by binding to and disruption of the gut mucosa and a two-fold increase in the plasma corticosterone concentration. These findings may lead to a better understanding of the role of diet in gastrointestinal maturation and may constitute a basis for the treatment of mammals having an immature gut.
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Affiliation(s)
- Ann Linderoth
- Department of Cell and Organism Biology, Lund University, Helgonavägen 3B, SE-223 62 Lund, Sweden.
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Zang J, Li D, Piao X, Tang S. Effects of soybean agglutinin on body composition and organ weights in rats. Arch Anim Nutr 2006; 60:245-53. [PMID: 16736858 DOI: 10.1080/17450390600679082] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
An experiment was conducted to assess the effect of soybean agglutinin dosage level on growth, body composition, plasma lipids, glucose, urea nitrogen content and aminotransferase activities in rats. Male and female rats (n=60) weaned at 19 d were given a dose of 0, 3.5, 7.0, 10.5, or 14.0 mg soybean agglutinin by gastric infusion once daily for 10 days. With increasing doses of soybean agglutinin, body weight, lipid content of carcass, spleen and kidneys relative dry weights decreased, while small intestine and pancreatic weight, the contents of urea nitrogen and triglyceride, and the activities of aspartate aminotransferase linearly increased in plasma. Though soybean agglutinin decreased plasma insulin content, changes in plasma glucose content due to soybean agglutinin were not detected. It is suggested that dietary soybean agglutinin may affect the secretion of other hormones besides insulin, which modulate blood glucose reserves. In conclusion, consumption of soybean agglutinin resulted in a depletion of lipid and an overgrowth of small intestine and pancreas in rats. Meanwhile, poor growth of spleen and kidneys was observed in the soybean agglutinin-fed rats.
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Affiliation(s)
- Jianjun Zang
- National Key Laboratory of Animal Nutrition, China Agricultural University, Beijing, PR China
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Pirman T, Combe E, Ribeyre MC, Prugnaud J, Stekar J, Patureau Mirand P. Differential Effects of Cooked Beans and Cooked Lentils on Protein Metabolism in Intestine and Muscle in Growing Rats. ANNALS OF NUTRITION AND METABOLISM 2006; 50:197-205. [PMID: 16407646 DOI: 10.1159/000090741] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2005] [Accepted: 10/13/2005] [Indexed: 11/19/2022]
Abstract
AIMS The effect of diets based on cooked beans or lentils on protein metabolism in intestines and muscles was studied in rats. METHOD The cooked seeds were used as the unique protein source in balanced diets (containing 229 and 190 g of crude protein per kg dry matter) fed to young growing rats for 20 days. Their effects were compared with those of the control casein diet in pair-fed rats. Protein synthesis rates in small and large intestines and in gastrocnemius and soleus muscles were determined in vivo, in a fed state, by the flooding dose method, using 13C-valine. RESULTS In the small and large intestine tissues of the legume fed groups, protein, RNA relative masses (mg.100 g BM(-1)) and protein synthesis rates (FSR and ASR) were higher than in the control rats (p < 0.05). In gastrocnemius and soleus muscles,protein and RNA contents (in mg) and protein synthesis rates were significantly (p < 0.05) lower in the legume-fed groups than in the control rats. CONCLUSION The chronic intake of cooked legumes increased protein synthesis rates in intestinal tissues and decreased them in muscles. This effect was greater for beans than for lentils in the large intestine and in gastrocnemius muscle.
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Affiliation(s)
- Tatjana Pirman
- Chair of Nutrition, Zootechnical Department, Biotechnical Faculty, University of Ljubljana, Domzale, Slovenia.
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Baintner K, Kiss P, Pikli A, Peumans W, Bardocz S, Pusztai A. Origin and mediation of secretion induced by oral phytohaemagglutinin (PHA) in rats. ACTA ACUST UNITED AC 2006; 91:221-33. [PMID: 16438116 DOI: 10.1556/aphysiol.91.2004.3-4.6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
After oral administration several gut-binding lectins induce accumulation of liquor and amylase in the proximal small intestine. Orally administered Phaseolus vulgaris phytohaemagglutinin (PHA) was used to study the mediation of these effects in rats. The regulation of amylase secretion clearly differed from that of the liquor. The amylase activity was of pancreatic origin, in agreement with the known cholecystokinin-releasing effect of PHA. It appears that CCK exerts its effect both directly and by facilitating neural stimulatory pathways. Intestinal secretion was identified as the source of the liquor, without a contribution by other secretions. It was mediated by a local cholinergic reflex with the involvement of both muscarinic and nicotinic acetylcholine receptors. It is speculated that the observed enteric reflex may enable the gut to transport secreted antibacterial peptides or secretory antibodies from the crypts to adherent bacteria on adjacent villi.
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Affiliation(s)
- K Baintner
- Department of Physiology, Faculty of Animal Science, University of Kaposvár, Hungary.
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Abstract
Lectins are carbohydrate binding (glyco)proteins which are ubiquitous in nature. In plants, they are distributed in various families and hence ingested daily in appreciable amounts by both humans and animals. One of the most nutritionally important features of plant lectins is their ability to survive digestion by the gastrointestinal tract of consumers. This allows the lectins to bind to membrane glycosyl groups of the cells lining the digestive tract. As a result of this interaction a series of harmful local and systemic reactions are triggered placing this class of molecules as antinutritive and/or toxic substances. Locally, they can affect the turnover and loss of gut epithelial cells, damage the luminal membranes of the epithelium, interfere with nutrient digestion and absorption, stimulate shifts in the bacterial flora and modulate the immune state of the digestive tract. Systemically, they can disrupt lipid, carbohydrate and protein metabolism, promote enlargement and/or atrophy of key internal organs and tissues and alter the hormonal and immunological status. At high intakes, lectins can seriously threaten the growth and health of consuming animals. They are also detrimental to numerous insect pests of crop plants although less is presently known about their insecticidal mechanisms of action. This current review surveys the recent knowledge on the antinutritional/toxic effects of plant lectins on higher animals and insects.
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Affiliation(s)
- Ilka M Vasconcelos
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, Caixa Postal 6020, Campus do Pici, CEP 60451-970, Fortaleza, CE, Brazil.
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Csáky I, Fekete S. Soybean: feed quality and safety. Part 1: biologically active components. A review. Acta Vet Hung 2004; 52:299-313. [PMID: 15379445 DOI: 10.1556/avet.52.2004.3.6] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A large number of soybean components have diverse biological activities. These include hormonal, immunological, bacteriological and digestive effects. The presently known allergens are listed. The divergence between chemical evaluation and biological value is highlighted. The following components are discussed: Kunitz inhibitor, Bowman-Birk inhibitor, saponins, soyacystatin, phytoestrogens (daidzein, glycitein, genistein), Maillard products, soybean hydrophobic protein, soy allergens, lecithin allergens, raffinose, stachyose, 2-pentyl pyridine. The studies describing the effects of the isolated components are reviewed.
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Affiliation(s)
- I Csáky
- Institute of Animal Breeding, Nutrition and Laboratory Animal Science, Faculty of Veterinary Science, Szent István University, H-1078 Budapest, István u 2, Hungary.
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Santidrián S, de Moya CC, Grant G, Frühbeck G, Urdaneta E, García M, Marzo F. Local (gut) and systemic metabolism of rats is altered by consumption of raw bean (Phaseolus vulgaris L var athropurpurea). Br J Nutr 2003; 89:311-9. [PMID: 12628026 DOI: 10.1079/bjn2002777] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The composition of the raw legume Phaseolus vulgaris L. var. athropurpurea (PhVa) and its effects on the metabolism of young growing rats have been evaluated. The levels of protein, unsaturated fatty acids, carbohydrate, fibre and bioactive factors present in PhVa were comparable with those in other Phaseolus vulgaris varieties. However, the lectins of PhVa were predominantly of the leucoagglutinating type, and concentrated in the albumin protein fraction. Rats fed a diet (110 g total protein, 16.0 MJ/kg) in which PhVa meal provided about half of the protein excreted high levels of N in faeces and urine, and grew more slowly, than rats fed a high-quality control diet (ad libitum or pair-fed). Small intestine, large intestine and pancreas weights were increased (by almost 100 %, P<0.05), whilst skeletal muscle, thymus and spleen weights were reduced. Blood insulin (16.20 v. 0.50 mU/l, P<0.05, thyroxine, glucose, protein (60.5 v. 48.3 g/l, P<0.05) and LDL-cholesterol were lowered, whilst glucagon (155.3 v. 185.4 ng/l, P<0.05), triiodothyronine and urea were elevated, as were urinary urea, creatinine and glucose. These changes in the local (gut) and systemic metabolism of rats were probably mediated primarily by lectins in PhVa, which were concentrated in the albumin protein fraction, whereas in many other Phaseolus vulgaris lines they are distributed across the globulin and albumin fractions.
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Affiliation(s)
- Santiago Santidrián
- Department of Human Physiology, School of Medicine, University of Navarra, 31008 Pamplona, Spain
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Reynoso-Camacho R, González de Mejía E, Loarca-Piña G. Purification and acute toxicity of a lectin extracted from tepary bean (Phaseolus acutifolius). Food Chem Toxicol 2003; 41:21-7. [PMID: 12453724 DOI: 10.1016/s0278-6915(02)00215-6] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Lectins are proteins or glycoproteins known for their ability to agglutinate cells, especially erythrocytes. Several lectins are toxic to mammalian cells both in vitro and in vivo, inhibit growth when incorporated into the diet and are toxic when injected into animals. On the other hand, the use of lectins has been suggested as an alternative in cancer treatment. The objective of the present study was to evaluate the acute toxicity of a lectin extracted and purified from tepary bean (Phaseolus acutifolius, G-400-34) on CD-1 mice. Fetuin affinity chromatography, electrophoretic pattern and Western-immunoblot techniques were used to purify and partially characterize the lectin. This tepary bean line presented high levels of lectin activity. Western blot revealed that the sera reacted with the known PHA subunits in the 34-40 kD range. Four major lectin and lectin-related glycopolypeptides were identified. The purified lectin from tepary bean was a tetrameric one that ran at about 115-120 kD. The LD(50) (ip) was 1100 mg/kg body weight for males and 1120 mg/kg body weight for females. The body weight of experimental animals decreased in a dose-dependent manner. The main target organs affected were small intestine, spleen and thymus. The lectin isolated from tepary bean showed affinity towards fetuin, with high agglutination values and low acute toxicity.
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Affiliation(s)
- R Reynoso-Camacho
- PROPAC (Programa de Posgrado en Alimentos del Centro de la República), Research and Graduate Studies in Food Science, School of Chemistry, Universidad Autónoma de Querétaro, Mexico
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Abstract
Pulses supply many bioactive substances found in minor amounts in food, but which may have significant metabolic and/or physiological effects. These compounds have long been classified as antinutritional factors, but many studies have reconsidered their impact on health. Some could play a role in the prevention of the major diseases of affluent societies. As these compounds can be beneficial or adverse, depending on conditions, an assessment of their various physiological effects is necessary to determine whether they should be preserved or eliminated in each main nutritional situation.
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Affiliation(s)
- Martine M-J Champ
- National Institute for Agronomic Research (INRA), Human Nutrition Research Centre, Rue de la Géraudière, BP 71627, 44316 Nantes, Cedex 03, France.
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Lajolo FM, Genovese MI. Nutritional significance of lectins and enzyme inhibitors from legumes. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2002; 50:6592-6598. [PMID: 12381157 DOI: 10.1021/jf020191k] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Legumes have natural components, such as lectins, amylase, and trypsin inhibitors, that may adversely affect their nutritional properties. Much information has already been obtained on their antinutritional significance and how to inactivate them by proper processing. Chronic ingestion of residual levels is unlikely to pose risks to human health. On the other hand, the ability of these molecules to inhibit some enzymes such as trypsin, chymotrypsin, disaccharidases, and alpha-amylases, to selectively bind to glycoconjugates, and to enter the circulatory system may be a useful tool in nutrition and pharmacology. Trypsin inhibitors have also been studied as cancer risk reducing factors. These components seem to act as plant defense substances. However, increased contents may represent an impairment of the nutritional quality of legumes because these glycoproteins and the sulfur-rich protease inhibitors have been shown to be poorly digested and to participate in chemical reactions during processing reducing protein digestibility, a still unsolved question.
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Affiliation(s)
- Franco M Lajolo
- Departamento de Alimentos e Nutrição Experimental, Universidade de São Paulo, Avenida Prof. Lineu Prestes 580, CEP 05508-900, São Paulo, Brazil
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Alonso R, Grant G, Frühbeck G, Marzo F. Muscle and liver protein metabolism in rats fed raw or heat-treated pea seeds. J Nutr Biochem 2002; 13:611-618. [PMID: 12550073 DOI: 10.1016/s0955-2863(02)00186-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Raw or extruded pea (Pisum sativum, cv. Ballet) diets with or without supplementary amino acids were fed for 15 days to young growing rats and the effects on tissue weights, liver and muscle protein metabolism and hormone levels monitored. Body weight gain, liver and gastrocnemius muscle weights and protein contents were reduced and some key hormones altered when rats were fed unsupplemented raw pea diets. This appeared to be a result of amino acid deficiencies in the diet, the action of antinutritional factors and the refractory nature of the reserve proteins and other seed components. However, this did not in itself improve the nutritional performance of the rats due to the overriding effects of the amino acid deficiencies in the pea diets. After supplementation, extruded peas supported much higher rates of growth and skeletal muscle deposition than did supplemented raw peas. Despite this, the weight gains remained less than achieved on a high quality control diet. Protein synthesis and degradation rates in skeletal muscles and total protein contents were similar to control values. The lower growth rate did not appear to be due to impaired deposition of skeletal muscle. Deposition of other body components, possibly lipids, may have been lowered by supplemented extruded pea diets. Liver protein levels were reduced in rats fed supplemented raw peas and blood corticosterone was elevated. In conclusion, extrusion treatment of peas in combination with amino acid supplementation appeared to abolish the negative effects of peas on skeletal muscle deposition.
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Affiliation(s)
- Ruben Alonso
- Physiology and Animal Nutrition Lab., E. T.S.I.A., Universidad Pública de Navarra, Campus Arrosadi;a, 31006, Pamplona, Spain
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Sasaki M, Fitzgerald AJ, Grant G, Ghatei MA, Wright NA, Goodlad RA. Lectins can reverse the distal intestinal atrophy associated with elemental diets in mice. Aliment Pharmacol Ther 2002; 16:633-42. [PMID: 11876719 DOI: 10.1046/j.1365-2036.2002.01160.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Elemental diets cause intestinal atrophy and reduced intestinal integrity, which can lead to significant increases in intestinal permeability and bacterial translocation. Recently, several lectins have been shown to have trophic effects on the intestine. AIMS We examined the effects of concanavalin-A and phytohaemagglutinin on cell proliferation and crypt fission throughout the intestine of mice fed on elemental diets. METHODS Mice were randomized to chow fed, elemental diet, elemental diet plus concanavalin-A and elemental diet plus phytohaemagglutinin groups. Cell proliferation and crypt fission were estimated in microdissected crypts. Plasma gastrin and enteroglucagon levels were measured by radioimmunoassay. RESULTS Elemental diet feeding significantly decreased cell proliferation and crypt fission of the middle and distal small intestine and throughout the colon. Phytohaemagglutinin significantly increased the weight of the intestine, but concanavalin-A had little effect. Cell proliferation in the small intestine was significantly increased by both lectins. However, in the stomach and colon, only phytohaemagglutinin increased proliferation. Crypt fission in the colon was dramatically increased by phytohaemagglutinin. Phytohaemagglutinin increased the plasma gastrin level, but not the enteroglucagon level. CONCLUSIONS Lectins have significant trophic effects on the small intestine and colon of mice fed elemental diets, and these actions vary between different sites in the gastrointestinal tract.
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Affiliation(s)
- M Sasaki
- Department of Histopathology, Imperial College School of Medicine, Hammersmith Hospital, London, UK
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Fitches E, Ilett C, Gatehouse AM, Gatehouse LN, Greene R, Edwards JP, Gatehouse JA. The effects of Phaseolus vulgaris erythro- and leucoagglutinating isolectins (PHA-E and PHA-L) delivered via artificial diet and transgenic plants on the growth and development of tomato moth (Lacanobia oleracea) larvae; lectin binding to gut glycoproteins in vitro and in vivo. JOURNAL OF INSECT PHYSIOLOGY 2001; 47:1389-1398. [PMID: 12770145 DOI: 10.1016/s0022-1910(01)00129-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Red kidney bean, Phaseolus vulgaris, contains a lectin phytohemagglutinin (PHA) with toxicity towards higher animals. PHA exists in the isoforms PHA-E and PHA-L, which agglutinate erythrocytes and lymphocytes, respectively. Lacanobia oleracea larvae were reared from hatch on artificial diets containing PHA-E or PHA-L at 2% (w/w) dietary protein, and on transgenic Arabidopsis plants expressing either lectin at 0.4-0.6% of total soluble proteins. In artificial diet bioassays neither lectin affected larval survival, development, growth nor consumption. In transgenic plant bioassays both PHA-E and PHA-L promoted larval growth and development. This effect was greatest for PHA-E. Mean larval biomass of insects fed on plants expressing PHA-E was significantly greater (up to two-fold) than controls during the final two instars and the insects developed at a significantly greater rate so that after 26 days 83% of PHA-E exposed insects were in the final instar compared to 44% for control insects. PHA-E and PHA-L were detected by Western blotting in haemolymph, sampled from insects fed diets or plant material containing the lectins. However, despite the demonstrated potential for both isolectins to bind to gut glycopolypeptides in vitro neither was found to accumulate in vivo in the guts of exposed insects. Since lectin binding to gut polypeptides is thought to be necessary for insecticidal activity the failure of PHA-E and PHA-L to bind in vivo may account for their lack of toxicity to L. oleracea.
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Affiliation(s)
- E Fitches
- Central Science Laboratory, Sand Hutton, YO41 1LZ, York, UK
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Lavelle EC, Grant G, Pusztai A, Pfüller U, O'Hagan DT. The identification of plant lectins with mucosal adjuvant activity. Immunology 2001; 102:77-86. [PMID: 11168640 PMCID: PMC1783150 DOI: 10.1046/j.1365-2567.2001.01157.x] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
To date, the most potent mucosal vaccine adjuvants to be identified have been bacterial toxins. The present data demonstrate that the type 2 ribosome-inactivating protein (type 2 RIP), mistletoe lectin I (ML-I) is a strong mucosal adjuvant of plant origin. A number of plant lectins were investigated as intranasal (i.n.) coadjuvants for a bystander protein, ovalbumin (OVA). As a positive control, a potent mucosal adjuvant, cholera toxin (CT), was used. Co-administration of ML-I or CT with OVA stimulated high titres of OVA-specific serum immunoglobulin G (IgG) in addition to OVA-specific IgA in mucosal secretions. CT and ML-I were also strongly immunogenic, inducing high titres of specific serum IgG and specific IgA at mucosal sites. None of the other plant lectins investigated significantly boosted the response to co-administered OVA. Immunization with phytohaemagglutinin (PHA) plus OVA elicited a lectin-specific response but did not stimulate an enhanced response to OVA compared with the antigen alone. Intranasal delivery of tomato lectin (LEA) elicited a strong lectin-specific systemic and mucosal antibody response but only weakly potentiated the response to co-delivered OVA. In contrast, administration of wheatgerm agglutinin (WGA) or Ulex europaeus lectin 1 (UEA-I) with OVA stimulated a serum IgG response to OVA while the lectin-specific responses (particularly for WGA) were relatively low. Thus, there was not a direct correlation between immunogenicity and adjuvanticity although the strongest adjuvants (CT, ML-I) were also highly immunogenic.
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Affiliation(s)
- E C Lavelle
- Institute for Immunology, Department of Biology, National University of Ireland, Maynooth, Co. Kildare, Ireland
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Carbonaro M, Grant G, Cappelloni M, Pusztai A. Perspectives into factors limiting in vivo digestion of legume proteins: antinutritional compounds or storage proteins? JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2000; 48:742-749. [PMID: 10725143 DOI: 10.1021/jf991005m] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The in vivo protein digestibility of raw and cooked common bean (Phaseolus vulgaris L.) and faba bean (Vicia faba L.) and of protein fractions extracted from them was determined with growing rats. Overnight-fasted rats were intubated with a protein suspension or fed the same amount of protein added to a basal diet. The rats were killed 1 h later, the contents of stomach and small intestine were washed out, and their protein contents were measured. The in vivo digestibility of proteins of raw common bean flour was 72.4% and not significantly improved after cooking. In contrast, the digestibility of faba bean proteins was decreased from 86.5 to 60.6% by the thermal treatment. Globulins from either species had similar digestibilities (approximately 70%). Proteins in the soluble fraction of cooked beans were more digestible than those in the insoluble fraction, which contained the bulk of the proteins. Hemagglutination assay and trypsin inhibitor determination indicated that after the thermal treatment only very low, nonharmful, levels of both lectin and inhibitor remained. Faba bean contained more polyphenols than common bean samples, with most of the polyphenols being bound to globulins. However, protein-bound polyphenols were markedly decreased after cooking. SDS-PAGE characterization of the gastrointestinal digesta of globulins and amino acid analysis of undigested proteins of whole cooked common bean and faba bean suggested that it is mainly the structural properties of the storage proteins and not their binding of polyphenols, which determines the extent of protein aggregation on autoclaving and may therefore be responsible for their low digestibility.
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Affiliation(s)
- M Carbonaro
- Istituto Nazionale di Ricerca per gli Alimenti e la Nutrizione, Via Ardeatina 546, 00178 Roma, Italy.
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Abstract
The mucosal immunogenicity of a number of plant lectins with different sugar specificities was investigated in mice. Following intranasal (i.n.) or oral administration, the systemic and mucosal antibody responses elicited were compared with those induced by a potent mucosal immunogen (cholera toxin; CT) and a poorly immunogenic protein (ovalbumin; OVA). After three oral or i.n. doses of CT, high levels of specific serum antibodies were measured and specific IgA was detected in the serum, saliva, vaginal wash, nasal wash and gut wash of mice. Immunization with OVA elicited low titres of serum IgG but specific IgA was not detected in mucosal secretions. Both oral and i.n. delivery of all five plant lectins investigated ¿Viscum album (mistletoe lectin 1; ML-1), Lycospersicum esculentum (tomato lectin; LEA), Phaseolus vulgaris (PHA), Triticum vulgaris (wheat germ agglutinin (WGA), Ulex europaeus I (UEA-1) stimulated the production of specific serum IgG and IgA antibody after three i. n. or oral doses. Immunization with ML-1 induced high titres of serum IgG and IgA in addition to specific IgA in mucosal secretions. The response to orally delivered ML-1 was comparable to that induced by CT, although a 10-fold higher dose was administered. Immunization with LEA also induced high titres of serum IgG, particularly after i. n. delivery. Low specific IgA titres were also detected to LEA in mucosal secretions. Responses to PHA, WGA and UEA-1 were measured at a relatively low level in the serum, and little or no specific mucosal IgA was detected.
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Affiliation(s)
- E C Lavelle
- Rowett Research Institute, Bucksburn, Aberdeen, UK
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Kordás K, Burghardt B, Kisfalvi K, Bardocz S, Pusztai A, Varga G. Diverse effects of phytohaemagglutinin on gastrointestinal secretions in rats. JOURNAL OF PHYSIOLOGY, PARIS 2000; 94:31-6. [PMID: 10761686 DOI: 10.1016/s0928-4257(99)00106-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Kidney bean lectin phytohaemagglutinin (PHA) is known for its binding capacity to the small intestinal surface inducing marked hyperplasia and hypertrophy and an increased pancreatic function. Recent observations indicate that PHA is able to attach to gastric mucosal and parietal cells. Therefore, we compared the effects of PHA on gastric acid secretion, and pancreatic amylase secretion in rats. To study gastric secretion in conscious animals, rats were surgically prepared with chronic stainless steel gastric cannula and with indwelling polyethylene jugular vein catheter. Acid secretion was determined by titration of the collected gastric juice to pH 7.0. Similar studies were performed to investigate the effect of PHA on pancreatic enzyme secretion in conscious rats supplied with pancreatic cannula. Pancreatic enzyme secretion was also studied in rats anesthetized with either halothane or urethane. In conscious rats PHA significantly inhibited basal acid secretion when compared to vehicle-treated controls. The effect was dose-dependent and reversible. On the other hand, given in the same doses as in the acid-secretory studies, PHA stimulated pancreatic amylase secretion in rats prepared with chronic pancreatic cannula. This effect was blocked by devazepide, a CCK-A receptor antagonist. In halothane-anesthetized rats PHA administration increased pancreatic amylase secretion, too. During urethane anesthesia, however, the stimulatory effect of PHA was not observed. These results provide evidence that intragastric PHA treatment induces opposite effects on gastric acid secretion and pancreatic enzyme secretion: it is a potent inhibitor of acid output, and a stimulator of pancreatic enzyme discharge. Our data also show that the stimulatory effect of PHA on pancreatic enzyme secretion can be blocked by urethane, an anaesthetic that is known to turn off the negative pancreatic feedback control of pancreatic function in rats.
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Affiliation(s)
- K Kordás
- Institute of Experimental Medicine, Hungarian Academy of Sciences, Budapest
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Pryme IF, Pusztai A, Bardocz S, Ewen SW. A combination of dietary protein depletion and PHA-induced gut growth reduce the mass of a murine non-Hodgkin lymphoma. Cancer Lett 1999; 139:145-52. [PMID: 10395171 DOI: 10.1016/s0304-3835(99)00033-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The results presented in this study show that a switch from a non-protein diet (NPD) to one of a normal protein content (LA) on the day of subcutaneous injection of non-Hodgkin lymphoma tumour cells greatly favoured the development and growth of the tumour. Interestingly, however, inclusion of the plant lectin phytohaemagglutinin (PHA) in the LA diet appeared to compete with the effect of switch to the protein-rich diet, resulting in decreased tumour size and an increased incidence of necrosis. PHA was shown to induce hyperplasia of the gut even in the presence of the growing tumour. This observation together with the fact that gut hyperplasia also occurred in animals which were fed NPD supplemented with PHA, indicated the strength of PHA as a growth signal. It would seem likely that this 'normal' growth is able to compete with the tumour for important growth factors and nutrients, including polyamines, effectively starving the tumour for these molecules and resulting in its decreased rate of proliferation.
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Affiliation(s)
- I F Pryme
- Department of Biochemistry and Molecular Biology, University of Bergen, Norway.
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Pusztai A, Grant G, Buchan WC, Bardocz S, de Carvalho AF, Ewen SW. Lipid accumulation in obese Zucker rats is reduced by inclusion of raw kidney bean (Phaseolus vulgaris) in the diet. Br J Nutr 1998; 79:213-21. [PMID: 9536866 DOI: 10.1079/bjn19980033] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The effects of inclusion of different levels of raw kidney bean (Phaseolus vulgaris) of high lectin content (27 g/kg meal) in a high-quality (lactalbumin) control diet were tested in nutritional trials on the growth and metabolism of obese Zucker (fafa) rats and their lean littermates in comparison with pair-fed controls. All diets contained 100 g total protein/kg and either 50 g lipids/kg (low fat) or 150 g lipids/kg (moderate fat). The growth of both obese and lean rats on bean diets was retarded by the daily bean intake in a dose-dependent manner. However, most of this was because bean-fed rats contained less body fat than the controls after 10 d. Thus, after feeding low-fat diets containing up to 130 g kidney bean/kg (lectin intake < or = 0.2 g/kg body weight (BW) per d) in both 10 d and 70 d trials, the bodies of obese rats contained less fat but not protein than their pair-fed controls. Moreover, by increasing the lipid content of the diet to 150 g/kg, the level of bean inclusion could be increased to 280 g/kg (lectin intake > or = 0.4 g/kg BW per d) without loss of body protein and skeletal muscle. Although these rats contained more body fat than those which were fed on low-fat diets, their weight reduction could be accounted for exclusively by reduced lipid content. In contrast, significant body protein loss occurred when the same diet of high lectin content was fed to lean littermates. Plasma insulin levels were significantly depressed in the obese Zucker rats on bean diets but the pancreas was not significantly enlarged nor its insulin content changed in 10 d trials. However, significant pancreatic growth occurred on long-term (70 d) bean feeding compared with pair-fed controls. The results suggest that, in addition to animal nutrition, it may also be possible to use the bean lectin as a dietary adjunct or therapeutic agent to stimulate gut function and ameliorate obesity if a safe and effective dose-range can be established for human subjects.
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Affiliation(s)
- A Pusztai
- Rowett Research Institute, Bucksburn, Aberdeen, UK.
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Jordinson M, Beales IL, Calam J. Soybean agglutinin stimulated cholecystokinin release from cultured rabbit jejunal cells requires calcium influx via L-type calcium channels. Peptides 1998; 19:1541-7. [PMID: 9864061 DOI: 10.1016/s0196-9781(98)00088-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We have studied the mechanism of soybean agglutinin (SBA) mediated cholecystokinin (CCK) release in enriched cultured cholecystokinin-secreting cells. 12-O-Tetradecanoylphorbol-13-acetate 1 mM significantly stimulated release of CCK-like-immunoreactivity (CCK-LI) by 55%+/-17% (p < 0.05), which was blocked by the protein kinase C inhibitor staurosporine 100 nM. Forskolin 10 mM stimulated CCK-LI by 82%+/-12% (p < 0.05) and this was inhibited by somatostatin 1 nM. 1-Phenylalanine 20 mM and Bay K 8644 1 mM stimulated CCK-LI by 69%+/-22% and 60%+/-19% respectively (p < 0.05), these responses were completely abolished by the L-type calcium channel antagonist verapamil 10 mM. SBA 10 and 100 microg/ml stimulated CCK-LI by 65%+/-22% and 74%+/-24% respectively (p < 0.05). The effect of SBA was inhibited by verapamil and N-acetylgalactosamine. We conclude that SBA stimulates CCK-LI through calcium flux via L-type calcium channels.
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Affiliation(s)
- M Jordinson
- Department of Gastroenterology, Imperial College School of Medicine, Hammersmith Hospital, London
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Pusztai A, Grant G, Gelencsér E, Ewen SW, Pfüller U, Eifler R, Bardocz S. Effects of an Orally Administered Mistletoe (Type-2 RIP) Lectin on Growth, Body Composition, Small Intestinal Structure, and Insulin Levels in Young Rats. J Nutr Biochem 1998. [DOI: 10.1016/s0955-2863(97)00164-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Abstract
Lectins are a family of proteins that stimulate cellular responses after binding to carbohydrate chains on plasma membranes. In the study described here, a mixture of lectins--pokeweed mitogen (PKW)--was shown to have insulinomimetic effects in mice. After receiving PKW (15 mg/kg intraperitoneally [IP]), serum glucose declined from 154 +/- 3 to 23 +/- 10 mg/dL by 24 hours later. Anorexia developed, and by 3 days, there was a significant decline in body weight. Carcass weights were 10% lower, and epididymal fat pad weights were 45% lower. When given for 16 days, PKW 3 mg/kg every other day caused a sustained 10% weight loss. Severe combined immune deficiency (SCID) mice were sensitive to PKW, showing that B and T lymphocytes were not required for the effects to develop. Cytokine antagonists attenuated the hypoglycemia and anorexia, but only by 50%. Further study showed that PKW has insulin-like effects in vitro. Glucose uptake was stimulated when murine C2C12 myotubes were exposed to an enriched fraction of PKW. These results demonstrated that PKW has both insulin-like activity and weight-reducing effects when administered to mice. The development of therapy for adult-onset diabetes or obesity based on lectins from pokeweed may be possible.
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Pusztai A, Grant G, Bardocz S, Gelencser E, Hajos G. Novel dietary strategy for overcoming the antinutritional effects of soyabean whey of high agglutinin content. Br J Nutr 1997; 77:933-45. [PMID: 9227190 DOI: 10.1079/bjn19970091] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A diet-switching experiment, which aimed to improve the utilization of soyabean whey was carried out for 61 d with young rats. Feeding was arranged in such a way that after a few days on the soyabean diet, the rats were switched to a high-quality lactalbumin diet for a short period, after which the cycle was repeated several times. The weights of the rats at the end of the soyabean phases were significantly less than those of animals pair-fed on a high-quality diet throughout. However, the test group regained the weight loss after switching to the lactalbumin diet. After three cycles there were no significant differences between the weights of the test rats fed on a poor soyabean diet for over a third of the experiment and those fed on the lactalbumin diet throughout. Feed conversion was always significantly higher with test rats in the lactalbumin period than with continually pair-fed controls. Similarly, faecal N losses were significantly higher for test rats in the soyabean phase, but these differences disappeared after switching to the lactalbumin diet. At the end of the experiment there were no significant differences in body protein or lipids between the groups although the pancreas was significantly heavier while the liver was lighter in soyabean-fed rats. The high destruction of trypsin inhibitors in the gut suggests that they probably had little effect on protein digestion in the gut. In contrast, as selective depletion of the agglutinin from soyabean whey removed the nutritional benefit in the lactalbumin part of the cycle, the improved feed conversion in this period must have been the result mainly of the survival and functionality of soyabean agglutinin and the benefits due to the hyperplastic growth and faster renewal of the gut surface it induced. As processing is unnecessary, this novel method is cheap and can be easily adapted for the use of soyabean whey, regarded as a waste product.
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Affiliation(s)
- A Pusztai
- Rowett Research Institute, Bucksburn, Aberdeen
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Grant G, Henderson LT, Edwards JE, Ewan EC, Bardocz S, Pusztai A. Kidney bean and soybean lectins cause enzyme secretion by pancreatic acini in vitro. Life Sci 1997; 60:1589-95. [PMID: 9126881 DOI: 10.1016/s0024-3205(97)00125-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The responses of pancreas acini from Hooded-Lister rats to kidney bean E2L2 lectin or soybean agglutinin have been studied in vitro. Both lectins induced secretion of alpha-amylase from acini in a dose dependent manner. However, the concentrations of lectin required to cause enzyme secretion were approximately 14-fold higher than that necessary with CCK-8. In addition, the responsiveness of pancreas acini to lectins in vitro was significantly altered by the age and sex of the rats from which the acini were derived.
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Affiliation(s)
- G Grant
- Rowett Research Institute, Aberdeen, Scotland, UK.
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