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Shan Q, Yu W, Xu Q, Liu R, Ying S, Dong J, Bao Y, Lyu Q, Shi C, Xia J, Tang J, Kuang H, Wang K, Tian G, Cao G. Detoxification and underlying mechanisms towards toxic alkaloids by Traditional Chinese Medicine processing: A comprehensive review. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2024; 129:155623. [PMID: 38703661 DOI: 10.1016/j.phymed.2024.155623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 03/29/2024] [Accepted: 04/09/2024] [Indexed: 05/06/2024]
Abstract
BACKGROUND Alkaloids have attracted enduring interest worldwide due to their remarkable therapeutic effects, including analgesic, anti-inflammatory, and anti-tumor properties, thus offering a rich source for lead compound design and new drug discovery. However, some of these alkaloids possess intrinsic toxicity. Processing (Paozhi) is a pre-treatment step before the application of herbal medicines in traditional Chinese medicine (TCM) clinics, which has been employed for centuries to mitigate the toxicity of alkaloid-rich TCMs. PURPOSE To explore the toxicity phenotypes, chemical basis, mode of action, detoxification processing methods, and underlying mechanisms, we can gain crucial insights into the safe and rational use of these toxic alkaloid-rich herbs. Such insights have the great potential to offer new strategies for drug discovery and development, ultimately improving the quality of life for millions of people. METHODS Literatures published or early accessed until December 31, 2023, were retrieved from databases including PubMed, Web of Science, and CNKI. The following keywords, such as "toxicity", "alkaloid", "detoxification", "processing", "traditional Chinese medicine", "medicinal plant", and "plant", were used in combination or separately for screening. RESULTS Toxicity of alkaloids in TCM includes hepatotoxicity, nephrotoxicity, neurotoxicity, cardiotoxicity, and other forms of toxicity, primarily induced by pyrrolizidines, quinolizidines, isoquinolines, indoles, pyridines, terpenoids, and amines. Factors such as whether the toxic-alkaloid enriched part is limited or heat-sensitive, and whether toxic alkaloids are also therapeutic components, are critical for choosing appropriate detoxification processing methods. Mechanisms of alkaloid detoxification includes physical removal, chemical decomposition or transformation, as well as biological modifications. CONCLUSION Through this exploration, we review toxic alkaloids and the mechanisms underlying their toxicity, discuss methods to reduce toxicity, and unravel the intricate mechanisms behind detoxification. These offers insights into the quality control of herbs containing toxic alkaloids, safe and rational use of alkaloid-rich TCMs in clinics, new strategies for drug discovery and development, and ultimately helping improve the quality of life for millions of people.
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Affiliation(s)
- Qiyuan Shan
- School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, China.
| | - Wei Yu
- School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, China; Clinical Research Unit, Changhai Hospital, Naval Medical University, Shanghai 200433, China
| | - Qiongfang Xu
- School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Ruina Liu
- School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Shuye Ying
- School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Jie Dong
- School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Yini Bao
- School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Qiang Lyu
- School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Changcheng Shi
- Department of Clinical Pharmacy, Key Laboratory of Clinical Cancer Pharmacology and Toxicology Research of Zhejiang Province, Affiliated Hangzhou First People's Hospital, School of Medicine, Westlake University, Hangzhou, China
| | - Junjie Xia
- School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Jing Tang
- School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Haodan Kuang
- School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Kuilong Wang
- School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, China.
| | - Gang Tian
- School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, China.
| | - Gang Cao
- School of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, China.
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Rogowska-van der Molen MA, Berasategui-Lopez A, Coolen S, Jansen RS, Welte CU. Microbial degradation of plant toxins. Environ Microbiol 2023; 25:2988-3010. [PMID: 37718389 DOI: 10.1111/1462-2920.16507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 09/05/2023] [Indexed: 09/19/2023]
Abstract
Plants produce a variety of secondary metabolites in response to biotic and abiotic stresses. Although they have many functions, a subclass of toxic secondary metabolites mainly serve plants as deterring agents against herbivores, insects, or pathogens. Microorganisms present in divergent ecological niches, such as soil, water, or insect and rumen gut systems have been found capable of detoxifying these metabolites. As a result of detoxification, microbes gain growth nutrients and benefit their herbivory host via detoxifying symbiosis. Here, we review current knowledge on microbial degradation of toxic alkaloids, glucosinolates, terpenes, and polyphenols with an emphasis on the genes and enzymes involved in breakdown pathways. We highlight that the insect-associated microbes might find application in biotechnology and become targets for an alternative microbial pest control strategy.
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Affiliation(s)
- Magda A Rogowska-van der Molen
- Department of Microbiology, Radboud Institute for Biological and Environmental Sciences, Radboud University, Nijmegen, The Netherlands
| | - Aileen Berasategui-Lopez
- Department of Microbiology and Biotechnology, University of Tübingen, Tübingen, Baden-Württemberg, Germany
- Amsterdam Institute for Life and Environment, Section Ecology and Evolution, Vrije Universiteit, Amsterdam, The Netherlands
| | - Silvia Coolen
- Department of Microbiology, Radboud Institute for Biological and Environmental Sciences, Radboud University, Nijmegen, The Netherlands
| | - Robert S Jansen
- Department of Microbiology, Radboud Institute for Biological and Environmental Sciences, Radboud University, Nijmegen, The Netherlands
| | - Cornelia U Welte
- Department of Microbiology, Radboud Institute for Biological and Environmental Sciences, Radboud University, Nijmegen, The Netherlands
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Widjaja F, Alhejji Y, Yangchen J, Wesseling S, Rietjens IMCM. Physiologically-Based Kinetic Modeling Predicts Similar In Vivo Relative Potency of Senecionine N-Oxide for Rat and Human at Realistic Low Exposure Levels. Mol Nutr Food Res 2023; 67:e2200293. [PMID: 36478522 DOI: 10.1002/mnfr.202200293] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 10/30/2022] [Indexed: 12/12/2022]
Abstract
SCOPE This study aims to determine if previously developed physiologically-based kinetic (PBK) model in rat can be modified for senecionine (SEN) and its N-oxide (SENO), and be used to investigate potential species differences between rat and human in relative potency (REP) of the N-oxide relative to the parent pyrrolizidine alkaloid (PA). METHODS AND RESULTS In vitro derived kinetic parameters including the apparent maximum velocities (Vmax ) and Michaelis-Menten constants (Km ) for SENO reduction and SEN clearance are used to define the PBK models. The rat model is validated with published animal data, and the toxicokinetic profiles of SEN from either orally-administered SENO or SEN are simulated. REP values of SENO relative to SEN amount to 0.84 and 0.89 in rat and human, respectively. CONCLUSION The REP value can be dose- and species-dependent, with the values for rat and human being comparable at low realistic exposure scenarios. In summary, PBK modeling serves as a valuable New Approach Methodology (NAM) tool for predicting REP values of PA-N-oxides and may actually result in more accurate REP values for human risk assessment than what would be defined using in vivo animal experiments.
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Affiliation(s)
- Frances Widjaja
- Division of Toxicology, Wageningen University, PO Box 8000, Wageningen, 6700 EA, The Netherlands
| | - Yasser Alhejji
- Division of Toxicology, Wageningen University, PO Box 8000, Wageningen, 6700 EA, The Netherlands.,Department of Food Science and Human Nutrition, College of Agriculture and Veterinary Medicine, Qassim University, Buraydah, 51452, Saudi Arabia
| | - Jamyang Yangchen
- Division of Toxicology, Wageningen University, PO Box 8000, Wageningen, 6700 EA, The Netherlands.,Bhutan Agriculture and Food Regulatory Authority, Ministry of Agriculture and Forests, Thimphu, 11002, Bhutan
| | - Sebastiaan Wesseling
- Division of Toxicology, Wageningen University, PO Box 8000, Wageningen, 6700 EA, The Netherlands
| | - Ivonne M C M Rietjens
- Division of Toxicology, Wageningen University, PO Box 8000, Wageningen, 6700 EA, The Netherlands
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Ohlsen S, Ganter M, Wohlsein P, Reckels B, Huckauf A, Lenzewski N, Aboling S. Grazing Ecology of Sheep and Its Impact on Vegetation and Animal Health on Pastures Dominated by Common Ragwort ( Senecio jacobaea L.)-Part 2: Animal Health. Animals (Basel) 2022; 12:1289. [PMID: 35625135 PMCID: PMC9137555 DOI: 10.3390/ani12101289] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 05/08/2022] [Accepted: 05/17/2022] [Indexed: 12/10/2022] Open
Abstract
Common ragwort (Senecio jacobaea L.) naturally occurs on species-rich grasslands. Containing pyrrolizidine alkaloids (PA), it endangers livestock health through contaminated feed. Although in vitro studies showed a detoxification capacity of PA in sheep, few field data are available on the ability of grazing sheep to cope with ragwort. During two grazing seasons on a ragwort-rich pasture, we studied: (1) To what extent do sheep voluntarily ingest ragwort and (2) What impact their grazing behavior has on animal health. Ragwort intake was monitored by counting missing plant parts and calculating their weight. From 70 sheep, seven were slaughtered at the beginning and in six-week intervals at the end of each grazing period to monitor blood parameters and liver tissue. Sheep continuously preferred ragwort. The daily intake was above the currently assumed lethal dose, varying between 0.2-4.9 kg per sheep. Clinical, hematologic, and blood biochemistry parameters mostly remained within the reference limits. Initially elevated liver copper content declined over time. The liver of all 70 animals displayed slight to moderate hepatitis, fibrosis, and proliferation of the bile ducts, but no morphological signs of liver cirrhosis. Sheep preferred and tolerated ragwort, making their grazing an option to control ragwort from both an animal health and nature conservation perspective.
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Affiliation(s)
- Susanne Ohlsen
- Institute of Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, 30173 Hannover, Germany;
| | - Martin Ganter
- Clinic for Swine, Small Ruminants, Forensic Medicine and Ambulatory Service, University of Veterinary Medicine Hannover, Foundation, 30173 Hanover, Germany;
| | - Peter Wohlsein
- Department of Pathology, University of Veterinary Medicine Hannover, Foundation, 30559 Hannover, Germany;
| | - Bernd Reckels
- Institute of Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, 30173 Hannover, Germany;
| | - Aiko Huckauf
- Nature Conservation Foundation Schleswig-Holstein, 24113 Molfsee, Germany;
| | - Nikola Lenzewski
- Institute of Plant Science and Microbiology, Universität Hamburg, 22609 Hamburg, Germany;
| | - Sabine Aboling
- Institute of Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, 30173 Hannover, Germany;
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Ohlsen S, Ganter M, Wohlsein P, Reckels B, Huckauf A, Lenzewski N, Aboling S. Grazing Ecology of Sheep and Its Impact on Vegetation and Animal Health in Pastures Dominated by Common Ragwort ( Senecio jacobaea L.)-Part 1: Vegetation. Animals (Basel) 2022; 12:1000. [PMID: 35454247 PMCID: PMC9026376 DOI: 10.3390/ani12081000] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 04/05/2022] [Accepted: 04/06/2022] [Indexed: 02/04/2023] Open
Abstract
Species-rich pastures naturally contain potentially toxic plants such as common ragwort (Senecio jacobaea L.), whose pyrrolizidine alkaloids (PA) impose a risk, mainly for cattle and horses. Although in vitro studies showed detoxification capacity of PA in sheep, few field data are available to ascertain whether grazing sheep can both tolerate and reduce ragwort. In a two-year study in a ragwort-rich pasture with a stocking density of 12 sheep/hectare, we documented (1) the extent of voluntarily ingested ragwort, (2) the correlation of nutritional parameters and feeding behavior, and (3) the impact of grazing on the yield proportion and number of flowers of dominant plants. Every six weeks the vegetation underwent a botanical survey and a chemical analysis. Sheep continuously ingested ragwort between 1.2 and 4.9 kg (2020) and 1.0 and 2.2 kg (2021) per individual per day without any impact on animal health. The more biomass ragwort produced, the more it contained sugar (r = 0.59-0.74), and the more sheep ingested it (r = 0.94-0.95). Other herbs increased their yield proportion from 23.3 to 36.5%, while that of ragwort decreased from 26.3 to 18.8% (2020/2021), doubling its flowers. Sheep preferred and tolerated ragwort, making their grazing an option to control ragwort from both an animal health and a nature conservation perspective.
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Affiliation(s)
- Susanne Ohlsen
- Institute of Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, 30173 Hannover, Germany;
| | - Martin Ganter
- Clinic for Swine, Small Ruminants, Forensic Medicine and Ambulatory Service, University of Veterinary Medicine Hannover, Foundation, 30173 Hannover, Germany;
| | - Peter Wohlsein
- Department of Pathology, University of Veterinary Medicine Hannover, Foundation, 30559 Hannover, Germany;
| | - Bernd Reckels
- Institute of Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, 30173 Hannover, Germany;
| | - Aiko Huckauf
- Nature Conservation Foundation Schleswig-Holstein, 24113 Molfsee, Germany;
| | - Nikola Lenzewski
- Institute of Plant Science and Microbiology, Universität Hamburg, 22609 Hamburg, Germany;
| | - Sabine Aboling
- Institute of Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, 30173 Hannover, Germany;
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Toxin Degradation by Rumen Microorganisms: A Review. Toxins (Basel) 2020; 12:toxins12100664. [PMID: 33092236 PMCID: PMC7590051 DOI: 10.3390/toxins12100664] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 10/07/2020] [Accepted: 10/13/2020] [Indexed: 12/21/2022] Open
Abstract
Animal feeds may contain exogenous compounds that can induce toxicity when ruminants ingest them. These toxins are secondary metabolites originating from various sources including plants, bacteria, algae and fungi. Animal feed toxins are responsible for various animal poisonings which negatively impact the livestock industry. Poisoning is more frequently reported in newly exposed, naïve ruminants while ‘experienced’ ruminants are observed to better tolerate toxin-contaminated feed. Ruminants can possess detoxification ability through rumen microorganisms with the rumen microbiome able to adapt to utilise toxic secondary metabolites. The ability of rumen microorganisms to metabolise these toxins has been used as a basis for the development of preventative probiotics to confer resistance against the poisoning to naïve ruminants. In this review, detoxification of various toxins, which include plant toxins, cyanobacteria toxins and plant-associated fungal mycotoxins, by rumen microorganisms is discussed. The review will include clinical studies of the animal poisoning caused by these toxins, the toxin mechanism of action, toxin degradation by rumen microorganisms, reported and hypothesised detoxification mechanisms and identified toxin metabolites with their toxicity compared to their parent toxin. This review highlights the commercial potential of rumen inoculum derived probiotics as viable means of improving ruminant health and production.
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Lodge-Ivey SL, Rappe MS, Johnston WH, Bohlken RE, Craig AM. Molecular analysis of a consortium of ruminal microbes that detoxify pyrrolizidine alkaloids. Can J Microbiol 2005; 51:455-65. [PMID: 16121223 DOI: 10.1139/w05-026] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Members of a consortium of bacteria, isolated from the rumen of sheep, that degrades pyrrolizidine alkaloids (PAs) found in tansy ragwort (Senecio jacobaea) were characterized. An enrichment of ruminal bacteria was isolated from a sample of ruminal fluid using standard anaerobic techniques. The PA degradative capacity of the enrichment was tested by spiking purified PA extract from tansy ragwort. Length heterogeneity analysis by PCR (LH-PCR) and restriction fragment length polymorphism (RFLP) analysis was used to identify members of the consortium. Phylogenetic analysis of the 16S rDNA gene revealed differing results based on the molecular method used. LH-PCR identified 7 different organisms in 3 groups while RFLP identified 6 organisms with differing banding patterns in 5 groups. After the phylogenetic analyses of both methods were combined, the combined isolates represented 6 groups. The majority of the members of this consortium are <97.0% homologous with known bacteria, indicating this consortium may contain novel organisms able to detoxify PAs found in tansy ragwort. Further understanding of the metabolic pathways used by this consortium to degrade PAs could lead to the use of the consortium as a probiotic therapy for livestock and horses afflicted with tansy ragwort toxicosis.Key words: pyrrolizidine alkaloids, ruminal bacteria, tansy ragwort, RFLP, LH-PCR.
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Affiliation(s)
- S L Lodge-Ivey
- College of Veterinary Medicine, Oregon State University, Corvallies, OR 97331, USA
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Fleischmann TJ, Walker KC, Spain JC, Hughes JB, Morrie Craig A. Anaerobic transformation of 2,4,6-TNT by bovine ruminal microbes. Biochem Biophys Res Commun 2004; 314:957-63. [PMID: 14751225 DOI: 10.1016/j.bbrc.2003.12.193] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Degradation of TNT by bovine rumen fluid, a novel source of anaerobic microbes, was investigated. Whole rumen fluid contents were spiked with TNT and incubated for a 24h time period. Supernatant samples taken at 0, 1, 2, 4, and 24h were analyzed by reverse-phase HPLC with diode array detection. Within 1h, TNT was not detectable and reduction products of TNT including 2-hydroxyl-amino-4,6-dinitrotoluene, 4-hydroxylamino-2,6-dinitrotoluene, and 4-amino-2,6-dinitrotoluene were present with smaller amounts of diamino-nitrotoluenes. Within 2h, only the diamino and dihydroxyamino-nitrotoluene products remained. After 4h, 2,4-diamino-6-nitrotoluene and 2,4-dihydroxyamino-6-nitrotoluene were the only known molecular species left. At 24h known UV absorbing metabolites were no longer detected, suggesting further transformation such as complete reduction to triaminotoluene or destruction of the aromatic ring of TNT may have occurred. TNT was not transformed at 24h in autoclaved and buffered controls. This study presents the first direct evidence of biodegradation of TNT by ruminal microbes.
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Affiliation(s)
- Thomas J Fleischmann
- College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331, USA
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