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Ho YL, Au TTD, Wu HY, Wu KC, Chang YS. Comparative study of Scleromitrion diffusum and Oldenlandia corymbosa: Microscopy, TLC, HPLC, and antioxidant activity. Microsc Res Tech 2024; 87:2371-2384. [PMID: 38808861 DOI: 10.1002/jemt.24611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/22/2024] [Accepted: 05/04/2024] [Indexed: 05/30/2024]
Abstract
Quality control of herbal medicines is crucial, especially the role of herbal drug identification. This is essential for preventing the misuse of herbs, which can affect efficacy or cause toxicity. Scleromitrion diffusum is a common herb, yet it is often mistaken for Oldenlandia corymbosa. This study analyzed the morphology, microscopy, thin-layer chromatography (TLC), and high-pressure liquid chromatography (HPLC) using two markers, asperuloside and scandoside methyl ester, to distinguish between S. diffusum and O. corymbosa with the analysis included 10 samples of S. diffusum and 10 samples of O. corymbosa collected from the Taiwan market. By quantifying the total polyphenols and flavonoids, we investigated the antioxidant activity, including the 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging effect, 2,2'-azino-bis 3-ethylbenzothiazoline-6-sulfonic acid (ABTS•+) scavenging effect, and reducing power to further elucidate the biological effects of the two herbs. The results of this study revealed notable differences in microscopy and suggested a TLC method for distinguishing between the two herbs in the market. In HPLC, the ratios of asperuloside and scandoside methyl ester differed between the two herbs. S. diffusum contained a higher asperuloside content. In contrast, O. corymbosa contained higher concentrations of scandoside methyl esters. With more total polyphenols and flavonoids in S. diffusum than those in O. corymbosa, the antioxidant activity of S. diffusum was superior to that of O. corymbosa. This study provides a comprehensive understanding for the identification and quality evaluation of S. diffusum in the market. RESEARCH HIGHLIGHTS: The study consolidates and clarifies the morphological and microscopic differences between Scleromitrion diffusum and Oldenlandia corymbosa - a common adulterant species of S. diffusum on the Taiwan markets. Using Asperuloside and Scandoside methyl ester as two chemical markers, the study proposes a TLC method for rapidly testing S. diffusum and O. corymbosa on the market. Through HPLC analysis, our results showed that S. diffusum and O. corymbosa had a clear difference in the ratio of two markers, Asperuloside and Scandoside methyl ester: Asperuloside/Scandoside methyl ester in S. diffusum is higher than that in O. corymbosa. Through phytochemicals contents, including total phenols content, flavonoids content, and antioxidant activity, including DPPH, ABTS•+ scavenging activity, and reducing power, S. diffusum showed slightly higher levels of phenols and flavonoids as well as a better antioxidant activity than O. corymbosa.
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Affiliation(s)
- Yu-Ling Ho
- Department of Nursing, Hungkuang University, Taichung, Taiwan
| | - Thanh-Thuy-Dung Au
- Department of Chinese Pharmaceutical Sciences and Chinese Medicine Resources, College of Chinese Medicine, China Medical University, Taichung, Taiwan
| | - Hung-Yi Wu
- Department of Quality Control, Min Tong Pharmaceutical Company, Taichung, Taiwan
| | - Kun-Chang Wu
- School of Pharmacy, China Medical University, Taichung, Taiwan
| | - Yuan-Shiun Chang
- Department of Chinese Pharmaceutical Sciences and Chinese Medicine Resources, College of Chinese Medicine, China Medical University, Taichung, Taiwan
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Huang S, Wu M, Deng M, Yang S, Wang X, Wang Z. Exploring the mechanism of Scleromitrion diffusum (Willd.) in treating lung cancer based on network pharmacology and experimental validation. Nat Prod Res 2024:1-5. [PMID: 38885333 DOI: 10.1080/14786419.2024.2367244] [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: 01/19/2024] [Accepted: 06/05/2024] [Indexed: 06/20/2024]
Abstract
This study aims to elucidate the mechanisms by which the effective components of Scleromitrion diffusum (Willd.) (SDW) treat lung cancer, using network pharmacology, in vitro cell experiments, and molecular docking methods. Network pharmacology techniques were employed to construct a network of SDW components, lung cancer targets, and signaling pathways. A proteinprotein interaction (P P I) network was built for target genes, identifying core gene targets. Signaling pathway and biological process analyses were conducted. MT T assays measured cell viability, and Western blot analysis assessed the impact of core protein targets and key pathway proteins on the stemness of three lung cancer cell lines. Molecular docking was performed to link SDW components with core proteins and key pathway targets related to lung cancer. SDW was found to target 88 genes and 5 active components (2-methoxy-3-methyl-9-10-anthraquinone, stigmasterol, beta-sitosterol, quercetin, and poriferasterol) relevant to lung cancer treatment. The P I3K/Akt and MEK/ERK pathways were identified as major signaling pathways. Extracts from SDW roots significantly inhibited the proliferation of three lung cancer cell lines (A549, HCC827, and NCIH-1395), primarily via P I3K/Akt and MEK/ERK pathways, significantly reducing the expression of p-Akt and p-Erk1/2 and slightly inhibiting caspase-9, p-P I3K, and EGFR expression. Molecular docking confirmed the strong binding activities of SDW components with lung cancer-related core proteins and key pathway targets. SDW may regulate apoptosis and proliferation in lung cancer treatment through P I3K-Akt and MAP K/ERK signaling pathways. The combination of network pharmacology, molecular docking, and experimental validation provides valuable insights into the molecular mechanisms of SDW in lung cancer therapy.
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Affiliation(s)
- Shujing Huang
- Department of Oncology, The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, Guangdong, China
| | - Muyun Wu
- The Fifth People's Hospital of Wuhu, Wuhu, Anhui, China
| | - Michen Deng
- Department of Oncology, The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, Guangdong, China
| | - Shu Yang
- Department of Oncology, The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, Guangdong, China
| | - Xicheng Wang
- Department of Oncology, The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, Guangdong, China
| | - Zhe Wang
- Department of Oncology, The First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, Guangdong, China
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Wachananawat B, Kong BL, Shaw P, Bongcheewin B, Sangvirotjanapat S, Prombutara P, Pornputtapong N, Sukrong S. Characterization and phylogenetic analysis of the complete chloroplast genome of Curcuma comosa and C. latifolia. Heliyon 2024; 10:e31248. [PMID: 38813184 PMCID: PMC11133819 DOI: 10.1016/j.heliyon.2024.e31248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 04/23/2024] [Accepted: 05/13/2024] [Indexed: 05/31/2024] Open
Abstract
Members of the Curcuma genus, a crop in the Zingiberaceae, are widely utilized rhizomatous herbs globally. There are two distinct species, C. comosa Roxb. and C. latifolia Roscoe, referred to the same vernacular name "Wan Chak Motluk" in Thai. C. comosa holds economic importance and is extensively used as a Thai traditional medicine due to its phytoestrogenic properties. However, its morphology closely resembles that of C. latifolia, which contains zederone, a compound known for its hepatotoxic effects. They are often confused, which may affect the quality, efficacy and safety of the derived herbal materials. Thus, DNA markers were developed for discriminating C. comosa from C. latifolia. This study focused on analyzing core DNA barcode regions, including rbcL, matK, psbA-trnH spacer and ITS2, of the authentic C. comosa and C. latifolia species. As a result, no variable nucleotides in core DNA barcode regions were observed. The complete chloroplast (cp) genome was introduced to differentiate between the two species. The comparison revealed that the cp genomes of C. comosa and C. latifolia were 162,272 and 162,289 bp, respectively, with a total of 133 identified genes. The phylogenetic analysis revealed that C. comosa and C. latifolia exhibited a very close relationship with other Curcuma species. The cp genome of C. comosa and C. latifolia were identified for the first time, providing valuable insights for species identification and evolutionary research within the Zingiberaceae family.
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Affiliation(s)
- Bussarin Wachananawat
- Center of Excellence in DNA Barcoding of Thai Medicinal Plants, Department of Pharmacognosy and Pharmaceutical Botany, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Bobby Lim‐Ho Kong
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine and Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, N.T., China
| | - Pang‐Chui Shaw
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine and Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, N.T., China
| | - Bhanubong Bongcheewin
- Department of Pharmaceutical Botany, Faculty of Pharmacy and Center of Excellence in Herbal Medicine and Natural Products, Faculty of Pharmacy, Mahidol University, Bangkok, 10400, Thailand
- Sireeruckhachati Nature Learning Park, Mahidol University, Nakhon Pathom, 73170, Thailand
| | | | - Pinidphon Prombutara
- Faculty of Science, Omics Science & Bioinformatics Center, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Natapol Pornputtapong
- Department of Biochemistry and Microbiology, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Suchada Sukrong
- Center of Excellence in DNA Barcoding of Thai Medicinal Plants, Department of Pharmacognosy and Pharmaceutical Botany, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok, 10330, Thailand
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Wong KH, Zheng T, Yue GGL, Li MC, Wu HY, Tong MH, Zhao XL, Chen HB, Lau CBS, Shaw PC, Lau DTW. A systematic approach for authentication of medicinal Patrinia species using an integration of morphological, chemical and molecular methods. Sci Rep 2024; 14:6566. [PMID: 38503940 PMCID: PMC10951358 DOI: 10.1038/s41598-024-57115-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Accepted: 03/14/2024] [Indexed: 03/21/2024] Open
Abstract
Four common Patrinia species, including P. heterophylla, P. monandra, P. scabiosifolia and P. villosa, have been documented as herbal medicines with various clinical applications, such as anti-cancer, anti-diarrhea and sedative. However, the authentication of medicinal Patrinia species poses a problem, particularly with the processed herbal materials. This study aimed to systematically authenticate the four medicinal Patrinia species in the market using morphological and chemical characterization, as well as DNA markers. We found the species identity authenticated by traditional morphologies were in good agreement with both chemical and molecular results. The four species showed species-specific patterns in chromatographic profiles with distinct chemical markers. We also revealed the power of complete chloroplast genomes in species authentication. The sequences of targeted loci, namely atpB, petA, rpl2-rpl23 and psaI-ycf4, contained informative nucleotides for the species differentiation. Our results also facilitate authentication of medicinal Patrinia species using new DNA barcoding markers. To the best of our knowledge, this is the first report on the application of morphology, chemical fingerprinting, complete chloroplast genomes and species-specific Insertion-Deletions (InDels) in differentiating Patrinia species. This study reported on the power of a systematic, multidisciplinary approach in authenticating medicinal Patrinia species.
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Affiliation(s)
- Kwan-Ho Wong
- Shiu-Ying Hu Herbarium, School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
- Li Dak Sum Yip Yio Chin R&D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
| | - Tao Zheng
- Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
- State Key Laboratory of Research On Bioactivities and Clinical Applications of Medicinal Plants, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
| | - Grace Gar-Lee Yue
- Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
- State Key Laboratory of Research On Bioactivities and Clinical Applications of Medicinal Plants, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
| | - Man-Ching Li
- Shiu-Ying Hu Herbarium, School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
| | - Hoi-Yan Wu
- Li Dak Sum Yip Yio Chin R&D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
| | - Man-Ho Tong
- Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
- State Key Laboratory of Research On Bioactivities and Clinical Applications of Medicinal Plants, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
| | - Xin-Lei Zhao
- The Institute of Medicinal Plant Development, The Chinese Academy of Medical Sciences and Peking Union Medical College, Haidian, Beijing, China
| | - Hu-Biao Chen
- School of Chinese Medicine, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China
| | - Clara Bik-San Lau
- Li Dak Sum Yip Yio Chin R&D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.
- Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.
- State Key Laboratory of Research On Bioactivities and Clinical Applications of Medicinal Plants, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.
- Department of Pharmacology and Pharmacy & School of Chinese Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong SAR, China.
| | - Pang-Chui Shaw
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.
- Li Dak Sum Yip Yio Chin R&D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.
- Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.
- State Key Laboratory of Research On Bioactivities and Clinical Applications of Medicinal Plants, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.
| | - David Tai-Wai Lau
- Shiu-Ying Hu Herbarium, School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.
- Li Dak Sum Yip Yio Chin R&D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.
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Lou C, Lin C, Wang W, Jiang H, Cai T, Lin S, Xue X, Lin J, Pan X. Extracts of Oldenlandia diffusa protects chondrocytes via inhibiting apoptosis and associated inflammatory response in osteoarthritis. JOURNAL OF ETHNOPHARMACOLOGY 2023; 316:116744. [PMID: 37295574 DOI: 10.1016/j.jep.2023.116744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 06/04/2023] [Accepted: 06/05/2023] [Indexed: 06/12/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Osteoarthritis (OA) is a type of joint disorder that is marked by the gradual breakdown of cartilage and persistent inflammation of the synovial membrane, and is a leading cause of disability among elderly people worldwide. Oldenlandia diffusa (OD) is a member of the Rubiaceae family, and various researches have revealed that it possesses antioxidant, anti-inflammatory, and anti-tumor properties.Extracts of Oldenlandia diffusa is commonly used in traditional oriental medicine to treat various illnesses, including inflammation and cancer. AIM OF THE STUDY This study is aimed at investigating the anti-inflammatory and anti-apoptosis effects of OD and its potential mechanisms on IL-1β-induced mouse chondrocytes, as well as its characteristics in a mouse osteoarthritis model. MATERIALS AND METHODS In this study, the key targets and potential pathways of OD were determined through network pharmacology analysis and molecular docking. The potential mechanism of OD in osteoarthritis was verified by in vitro and in vivo studies. RESULTS The results of network pharmacology showed that Bax, Bcl2, CASP3, and JUN are key candidate targets of OD for the treatment of osteoarthritis. There is a strong correlation between apoptosis and both OA and OD. Additionally, molecular docking results show that β-sitosterol in OD can strongly bind with CASP3 and PTGS2. In vitro experiments showed that OD pretreatment inhibited the expression of pro-inflammatory factors induced by IL-1β, such as COX2, iNOS, IL-6, TNF-α, and PGE2. Furthermore, OD reversed IL-1β-mediated degradation of collagen II and aggrecan within the extracellular matrix (ECM). The protective effect of OD can be attributed to its inhibition of the MAPK pathway and inhibition of chondrocyte apoptosis. Additionally, it was found that OD can alleviate cartilage degradation in a mouse model of knee osteoarthritis. CONCLUSION Our study showed that β-sitosterol, one of the active components of OD, could alleviate the inflammation and cartilage degeneration of OA by inhibiting chondrocyte apoptosis and MAPK pathway.
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Affiliation(s)
- Chao Lou
- Department of Orthopedics, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China
| | - Chihao Lin
- Department of Orthopedics, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China
| | - Weidan Wang
- Department of Orthopedics, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China
| | - Hongyi Jiang
- Department of Orthopedics, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China
| | - Tingwen Cai
- Department of Orthopedics, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China
| | - Shida Lin
- Department of Orthopedics, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China; Key Laboratory of Orthopaedics of Zhejiang Province, Wenzhou, Zhejiang Province, China
| | - Xinghe Xue
- Department of Orthopedics, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Jian Lin
- Department of Orthopedics, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China.
| | - Xiaoyun Pan
- Department of Orthopedics, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China.
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Chien TJ. The Holistic Philosophy of Traditional Chinese Medicine and Conflicts With Modern Medicine. Holist Nurs Pract 2023; 37:153-160. [PMID: 35435882 DOI: 10.1097/hnp.0000000000000508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Traditional Chinese medicine (TCM) has sparked the public's attention for its potential in new drug development and its holistic view toward health, which is totally different from the reductionistic science of modern medicine. Although many scholars try to connect TCM with precision medicine or apply new methods and technology to integrate TCM with modern medicine, the misunderstandings and gap between TCM and modern medicine limit the development of evidence-based TCM. Traditional Chinese medicine is actually a medical science encompassing not only medicine but also philosophy and art in direct contrast to molecular-based modern medicine. As more and more multidisciplinary studies are being published, finding ways to integrate TCM with modern or precision medicine through artificial intelligence, new study design and technology may become a critical issue. This article aims to briefly review the unique philosophy of TCM and its conflicts with modern medicine, with a focus on the potential integration of TCM and modern medicine. We also provide insight for the key attributes of TCM and the associated investigation with Western research approaches.
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Affiliation(s)
- Tsai-Ju Chien
- Division of Hemato-Oncology, Department of Internal Medicine, Branch of Zhong-Zhou, Taipei City Hospital, Taipei, Taiwan; Division of Hemato-Oncology, Department of Internal Medicine, Branch of Jen-Ai, Taipei City Hospital, Taipei, Taiwan; and Institute of Traditional Medicine, National Yang-Ming Chiao Tung University, Taipei, Taiwan
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Wong KH, Siu TY, Tsang SSK, Kong BLH, Wu HY, But GWC, Hui JHL, Shaw PC, Lau DTW. The Complete Chloroplast Genomes of Nine Smilacaceae Species from Hong Kong: Inferring Infra- and Inter-Familial Phylogeny. Int J Mol Sci 2023; 24:ijms24087460. [PMID: 37108622 PMCID: PMC10138973 DOI: 10.3390/ijms24087460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 04/06/2023] [Accepted: 04/14/2023] [Indexed: 04/29/2023] Open
Abstract
The Smilacaceae is a cosmopolitan family consisting of 200-370 described species. The family includes two widely accepted genera, namely Smilax and Heterosmilax. Among them, the taxonomical status of Heterosmilax has been continuously challenged. Seven Smilax and two Heterosmilax species can be found in Hong Kong, with most of them having medicinal importance. This study aims to revisit the infra-familial and inter-familial relationships of the Smilacaceae using complete chloroplast genomes. The chloroplast genomes of the nine Smilacaceae species from Hong Kong were assembled and annotated, which had sizes of 157,885 bp to 159,007 bp; each of them was identically annotated for 132 genes, including 86 protein-coding genes, 38 transfer RNA genes, and 8 ribosomal RNA genes. The generic status of Heterosmilax was not supported because it was nested within the Smilax clade in the phylogenetic trees, echoing previous molecular and morphological studies. We suggest delimitating the genus Heterosmilax as a section under the genus Smilax. The results of phylogenomic analysis support the monophyly of Smilacaceae and the exclusion of Ripogonum from the family. This study contributes to the systematics and taxonomy of monocotyledons, authentication of medicinal Smilacaceae, and conservation of plant diversity.
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Affiliation(s)
- Kwan-Ho Wong
- Shiu-Ying Hu Herbarium, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Tin-Yan Siu
- Shiu-Ying Hu Herbarium, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China
- Research Area of Ecology and Biodiversity, School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Stacey Shun-Kei Tsang
- Shiu-Ying Hu Herbarium, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Bobby Lim-Ho Kong
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Hoi-Yan Wu
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Grace Wing-Chiu But
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Jerome Ho-Lam Hui
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China
- Simon F.S. Li Marine Science Laboratory and State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Pang-Chui Shaw
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, China
- State Key Laboratory of Research on Bioactivities and Clinical Applications of Medicinal Plants (The Chinese University of Hong Kong) and Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - David Tai-Wai Lau
- Shiu-Ying Hu Herbarium, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, China
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8
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Julca I, Mutwil-Anderwald D, Manoj V, Khan Z, Lai SK, Yang LK, Beh IT, Dziekan J, Lim YP, Lim SK, Low YW, Lam YI, Tjia S, Mu Y, Tan QW, Nuc P, Choo LM, Khew G, Shining L, Kam A, Tam JP, Bozdech Z, Schmidt M, Usadel B, Kanagasundaram Y, Alseekh S, Fernie A, Li HY, Mutwil M. Genomic, transcriptomic, and metabolomic analysis of Oldenlandia corymbosa reveals the biosynthesis and mode of action of anti-cancer metabolites. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2023. [PMID: 36807520 DOI: 10.1111/jipb.13469] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 02/18/2023] [Indexed: 06/18/2023]
Abstract
Plants accumulate a vast array of secondary metabolites, which constitute a natural resource for pharmaceuticals. Oldenlandia corymbosa belongs to the Rubiaceae family, and has been used in traditional medicine to treat different diseases, including cancer. However, the active metabolites of the plant, their biosynthetic pathway and mode of action in cancer are unknown. To fill these gaps, we exposed this plant to eight different stress conditions and combined different omics data capturing gene expression, metabolic profiles, and anti-cancer activity. Our results show that O. corymbosa extracts are active against breast cancer cell lines and that ursolic acid is responsible for this activity. Moreover, we assembled a high-quality genome and uncovered two genes involved in the biosynthesis of ursolic acid. Finally, we also revealed that ursolic acid causes mitotic catastrophe in cancer cells and identified three high-confidence protein binding targets by Cellular Thermal Shift Assay (CETSA) and reverse docking. Altogether, these results constitute a valuable resource to further characterize the biosynthesis of active metabolites in the Oldenlandia group, while the mode of action of ursolic acid will allow us to further develop this valuable compound.
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Affiliation(s)
- Irene Julca
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
| | | | - Vaishnervi Manoj
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
| | - Zahra Khan
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
| | - Soak Kuan Lai
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
| | - Lay K Yang
- Shared Analytics, Singapore Institute of Food and Biotechnology Innovation (SIFBI), Agency for Science, Technology and Research (A*STAR), Singapore, 138671, Singapore
| | - Ing T Beh
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
| | - Jerzy Dziekan
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
| | - Yoon P Lim
- Department of Biochemistry, National University of Singapore, Singapore, 117596, Singapore
| | - Shen K Lim
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
- Department of Biochemistry, National University of Singapore, Singapore, 117596, Singapore
| | - Yee W Low
- Singapore Botanic Gardens, Singapore, 259569, Singapore
| | - Yuen I Lam
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
| | - Seth Tjia
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
| | - Yuguang Mu
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
| | - Qiao W Tan
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
| | - Przemyslaw Nuc
- Department of Gene Expression, Faculty of Biology, Institute of Molecular Biology and Biotechnology, Adam Mickiewicz University, Poznan, 61-614, Poland
| | - Le M Choo
- Singapore Botanic Gardens, Singapore, 259569, Singapore
| | - Gillian Khew
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
- Singapore Botanic Gardens, Singapore, 259569, Singapore
| | - Loo Shining
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
| | - Antony Kam
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
| | - James P Tam
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
| | - Zbynek Bozdech
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
| | | | - Bjoern Usadel
- IBG-4 Bioinformatics, Forschungszentrum Jülich, Jülich, 52428, Germany
| | - Yoganathan Kanagasundaram
- Shared Analytics, Singapore Institute of Food and Biotechnology Innovation (SIFBI), Agency for Science, Technology and Research (A*STAR), Singapore, 138671, Singapore
| | - Saleh Alseekh
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Potsdam-Golm, 14476, Germany
- Center of Plant Systems Biology and Biotechnology, Plovdiv, 4000, Bulgaria
| | - Alisdair Fernie
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Potsdam-Golm, 14476, Germany
- Center of Plant Systems Biology and Biotechnology, Plovdiv, 4000, Bulgaria
| | - Hoi Y Li
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
| | - Marek Mutwil
- School of Biological Sciences, Nanyang Technological University, Singapore, 639798, Singapore
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Fang H, Dai G, Liao B, Zhou P, Liu Y. Application of chloroplast genome in the identification of Phyllanthus urinaria and its common adulterants. FRONTIERS IN PLANT SCIENCE 2023; 13:1099856. [PMID: 36684764 PMCID: PMC9853280 DOI: 10.3389/fpls.2022.1099856] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 12/13/2022] [Indexed: 06/03/2023]
Abstract
BACKGROUND Phyllanthus urinaria L. is extensively used as ethnopharmacological material in China. In the local marketplace, this medicine can be accidentally contaminated, deliberately substituted, or mixed with other related species. The contaminants in herbal products are a threat to consumer safety. Due to the scarcity of genetic information on Phyllanthus plants, more molecular markers are needed to avoid misidentification. METHODS In this study, the complete chloroplast genome of nine species of the genus Phyllanthus was de novo assembled and characterized. RESULTS This study revealed that all of these species exhibited a conserved quadripartite structure, which includes a large single copy (LSC) region and small single copy (SSC) region, and two copies of inverted repeat regions (IRa and IRb), which separate the LSC and SSC regions. And the genome structure, codon usage, and repeat sequences were highly conserved and showed similarities among the nine species. Three highly variable regions (trnS-GCU-trnG-UCC, trnT-UGU-trnL-UAA, and petA-psbJ) might be helpful as potential molecular markers for identifying P. urinaria and its contaminants. In addition, the molecular clock analysis results showed that the divergence time of the genus Phyllanthus might occur at ~ 48.72 Ma. CONCLUSION This study provides valuable information for further species identification, evolution, and phylogenetic research of Phyllanthus.
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Affiliation(s)
| | | | | | - Ping Zhou
- *Correspondence: Yinglin Liu, ; Ping Zhou,
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10
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Huang Y, Li J, Yang Z, An W, Xie C, Liu S, Zheng X. Comprehensive analysis of complete chloroplast genome and phylogenetic aspects of ten Ficus species. BMC PLANT BIOLOGY 2022; 22:253. [PMID: 35606691 PMCID: PMC9125854 DOI: 10.1186/s12870-022-03643-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 05/12/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND The large genus Ficus comprises approximately 800 species, most of which possess high ornamental and ecological values. However, its evolutionary history remains largely unknown. Plastome (chloroplast genome) analysis had become an essential tool for species identification and for unveiling evolutionary relationships between species, genus and other rank groups. In this work we present the plastomes of ten Ficus species. RESULTS The complete chloroplast (CP) genomes of eleven Ficus specimens belonging to ten species were determined and analysed. The full length of the Ficus plastome was nearly 160 kbp with a similar overall GC content, ranging from 35.88 to 36.02%. A total of 114 unique genes, distributed in 80 protein-coding genes, 30 tRNAs, and 4 rRNAs, were annotated in each of the Ficus CP genome. In addition, these CP genomes showed variation in their inverted repeat regions (IR). Tandem repeats and mononucleotide simple sequence repeat (SSR) are widely distributed across the Ficus CP genome. Comparative genome analysis showed low sequence variability. In addition, eight variable regions to be used as potential molecular markers were proposed for future Ficus species identification. According to the phylogenetic analysis, these ten Ficus species were clustered together and further divided into three clades based on different subgenera. Simultaneously, it also showed the relatedness between Ficus and Morus. CONCLUSION The chloroplast genome structure of 10 Ficus species was similar to that of other angiosperms, with a typical four-part structure. Chloroplast genome sizes vary slightly due to expansion and contraction of the IR region. And the variation of noncoding regions of the chloroplast genome is larger than that of coding regions. Phylogenetic analysis showed that these eleven sampled CP genomes were divided into three clades, clustered with species from subgenus Urostigma, Sycomorus, and Ficus, respectively. These results support the Berg classification system, in which the subgenus Ficus was further decomposed into the subgenus Sycomorus. In general, the sequencing and analysis of Ficus plastomes, especially the ones of species with no or limited sequences available yet, contribute to the study of genetic diversity and species evolution of Ficus, while providing useful information for taxonomic and phylogenetic studies of Ficus.
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Affiliation(s)
- Yuying Huang
- Institute of Medicinal Plant Physiology and Ecology, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, 232th Waihuangdong Road, Higher Education Mega Center, Panyu District, Guangzhou, Guangdong, China
| | - Jing Li
- Traditional Chinese Medicine Gynecology Laboratory in Lingnan Medical Research Center, Guangzhou University of Chinese Medicine, Guangzhou, 510410, China
| | - Zerui Yang
- Institute of Medicinal Plant Physiology and Ecology, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, 232th Waihuangdong Road, Higher Education Mega Center, Panyu District, Guangzhou, Guangdong, China
| | - Wenli An
- Institute of Medicinal Plant Physiology and Ecology, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, 232th Waihuangdong Road, Higher Education Mega Center, Panyu District, Guangzhou, Guangdong, China
| | - Chunzhu Xie
- Institute of Medicinal Plant Physiology and Ecology, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, 232th Waihuangdong Road, Higher Education Mega Center, Panyu District, Guangzhou, Guangdong, China
| | - Shanshan Liu
- Institute of Medicinal Plant Physiology and Ecology, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, 232th Waihuangdong Road, Higher Education Mega Center, Panyu District, Guangzhou, Guangdong, China
| | - Xiasheng Zheng
- Institute of Medicinal Plant Physiology and Ecology, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, 232th Waihuangdong Road, Higher Education Mega Center, Panyu District, Guangzhou, Guangdong, China.
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Wu HY, Wong KH, Kong BLH, Siu TY, But GWC, Tsang SSK, Lau DTW, Shaw PC. Comparative Analysis of Chloroplast Genomes of Dalbergia Species for Identification and Phylogenetic Analysis. PLANTS 2022; 11:plants11091109. [PMID: 35567110 PMCID: PMC9104903 DOI: 10.3390/plants11091109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 04/12/2022] [Accepted: 04/12/2022] [Indexed: 11/16/2022]
Abstract
Dalbergia L.f. is a pantropical genus consisting of 269 species of trees, shrubs, and woody lianas. This genus is listed in CITES Appendices because of illegal logging and trafficking driven by the high economic value of its heartwood. Some species are also used medicinally. Species identification of Dalbergia timber and herbs is challenging but essential for CITES implementation. Molecular methods had been developed for some timber species, mostly from Madagascar and Southeast Asia, but medicinal species in south China were usually not included in those studies. Here, we sequenced and assembled the chloroplast genomes of five Dalbergia species native to Hong Kong, four of which are medicinal plants. Our aim is to find potential genetic markers for the identification of medicinal Dalbergia species based on divergence hotspots detected in chloroplast genomes after comparative and phylogenetic analysis. Dalbergia chloroplast genomes displayed the typical quadripartite structure, with the 50 kb inversion found in most Papilionoideae lineages. Their sizes and gene content are well conserved. Phylogenetic tree of Dalbergia chloroplast genomes showed an overall topology similar to that of ITS sequences. Four divergence hotspots (trnL(UAA)-trnT(UGU), ndhG-ndhI, ycf1a and ycf1b) were identified and candidate markers for identification of several Dalbergia species were suggested.
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Affiliation(s)
- Hoi-Yan Wu
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, China; (H.-Y.W.); (B.L.-H.K.)
| | - Kwan-Ho Wong
- Shiu-Ying Hu Herbarium, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China; (K.-H.W.); (T.-Y.S.); (D.T.-W.L.)
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China; (G.W.-C.B.); (S.S.-K.T.)
| | - Bobby Lim-Ho Kong
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, China; (H.-Y.W.); (B.L.-H.K.)
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China; (G.W.-C.B.); (S.S.-K.T.)
| | - Tin-Yan Siu
- Shiu-Ying Hu Herbarium, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China; (K.-H.W.); (T.-Y.S.); (D.T.-W.L.)
- School of Biological Sciences, The University of Hong Kong, Hong Kong, China
| | - Grace Wing-Chiu But
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China; (G.W.-C.B.); (S.S.-K.T.)
| | - Stacey Shun-Kei Tsang
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China; (G.W.-C.B.); (S.S.-K.T.)
| | - David Tai-Wai Lau
- Shiu-Ying Hu Herbarium, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China; (K.-H.W.); (T.-Y.S.); (D.T.-W.L.)
| | - Pang-Chui Shaw
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, China; (H.-Y.W.); (B.L.-H.K.)
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China; (G.W.-C.B.); (S.S.-K.T.)
- State Key Laboratory of Research on Bioactivities and Clinical Applications of Medicinal Plants (The Chinese University of Hong Kong) and Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, China
- Correspondence:
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Yang J, Hu G, Hu G. Comparative genomics and phylogenetic relationships of two endemic and endangered species (Handeliodendron bodinieri and Eurycorymbus cavaleriei) of two monotypic genera within Sapindales. BMC Genomics 2022; 23:27. [PMID: 34991482 PMCID: PMC8734052 DOI: 10.1186/s12864-021-08259-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 12/13/2021] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Handeliodendron Rehder and Eurycorymbus Hand.-Mazz. are the monotypic genera in the Sapindaceae family. The phylogenetic relationship of these endangered species Handeliodendron bodinieri (Lévl.) Rehd. and Eurycorymbus cavaleriei (Lévl.) Rehd. et Hand.-Mazz. with other members of Sapindaceae s.l. is not well resolved. A previous study concluded that the genus Aesculus might be paraphyletic because Handeliodendron was nested within it based on small DNA fragments. Thus, their chloroplast genomic information and comparative genomic analysis with other Sapindaceae species are necessary and crucial to understand the circumscription and plastome evolution of this family. RESULTS The chloroplast genome sizes of Handeliodendron bodinieri and Eurycorymbus cavaleriei are 151,271 and 158,690 bp, respectively. Results showed that a total of 114 unique genes were annotated in H. bodinieri and E. cavaleriei, and the ycf1 gene contained abundant SSRs in both genomes. Comparative analysis revealed that gene content, PCGs, and total GC content were remarkably similar or identical within 13 genera from Sapindaceae, and the chloroplast genome size of four genera was generally smaller within the family, including Acer, Dipteronia, Aesculus, and Handeliodendron. IR boundaries of the H. bodinieri showed a significant contraction, whereas it presented a notable expansion in E. cavaleriei cp genome. Ycf1, ndhC-trnV-UAC, and rpl32-trnL-UAG-ccsA were remarkably divergent regions in the Sapindaceae species. Analysis of selection pressure showed that there are a few positively selected genes. Phylogenetic analysis based on different datasets, including whole chloroplast genome sequences, coding sequences, large single-copy, small single-copy, and inverted repeat regions, consistently demonstrated that H. bodinieri was sister to the clade consisting of Aesculus chinensis and A. wangii and strongly support Eurycorymbus cavaleriei as sister to Dodonaea viscosa. CONCLUSION This study revealed that the cp genome size of the Hippocastanoideae was generally smaller compared to the other subfamilies within Sapindaceae, and three highly divergent regions could be used as the specific DNA barcodes within Sapindaceae. Phylogenetic results strongly support that the subdivision of four subfamilies within Sapindaceae, and Handeliodendron is not nested within the genus Aesculus.
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Affiliation(s)
- Jiaxin Yang
- Core Botanical Gardens/Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China.,Sino-Africa Joint Research Center, Chinese Academy of Sciences, Wuhan, 430074, China.,University of Chinese Academy of Sciences, Beijing, 100049, China.,College of Life Sciences, Guizhou University, Guiyang, 550025, Guizhou, China
| | - Guoxiong Hu
- College of Life Sciences, Guizhou University, Guiyang, 550025, Guizhou, China.
| | - Guangwan Hu
- Core Botanical Gardens/Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China. .,Sino-Africa Joint Research Center, Chinese Academy of Sciences, Wuhan, 430074, China.
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Hedyotis diffusa Willd. Suppresses Hepatocellular Carcinoma via Downregulating AKT/mTOR Pathways. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2021; 2021:5210152. [PMID: 34527062 PMCID: PMC8437616 DOI: 10.1155/2021/5210152] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 08/14/2021] [Accepted: 08/25/2021] [Indexed: 01/07/2023]
Abstract
Objective Hedyotis diffusa Willd. (HDW) is a famous Chinese herbal medicine, traditionally used to treat cancer in China. Currently, the clinically used drugs for the treatment of hepatocellular carcinoma (HCC) still have poor efficacy and have many side effects. HDW has fewer side effects after taking it, so this study explores the inhibitory effect of HDW on HCC, which may become a promising drug for the treatment of HCC. Methods HCC cell lines such as SMMC-7721, SK-hep1, and Hep-G2 were treated with Hedyotis diffusa Willd. (HDW), after which migration was detected via transwell, while the proliferation of these cells was detected via MTT, CCK-8, and colony formation assays. Furthermore, protein levels were evaluated by western blotting, and Hep-G2 cells were implanted in nude mice to establish a xenograft model to evaluate the antitumor effect of the drug. Results HDW exhibited the ability to inhibit the proliferation and migration of HCC cells. And its anticancer mechanism in hepatocellular carcinoma may be via AKT/mTOR pathway. Moreover, the drug use of HDW in the mouse model system has achieved a good effect. Importantly, it did not cause significant weight loss or hepatorenal toxicity. Conclusion HDW can suppress the activation of the AKT/mTOR pathway in HCC cells, which may bring new light for the treatment of this kind of malignant tumor, but its exact mechanism still needs to be further explored.
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