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Gempo N, Yeshi K, Crayn D, Wangchuk P. Climate-Affected Australian Tropical Montane Cloud Forest Plants: Metabolomic Profiles, Isolated Phytochemicals, and Bioactivities. PLANTS (BASEL, SWITZERLAND) 2024; 13:1024. [PMID: 38611553 PMCID: PMC11013060 DOI: 10.3390/plants13071024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Revised: 03/27/2024] [Accepted: 03/28/2024] [Indexed: 04/14/2024]
Abstract
The Australian Wet Tropics World Heritage Area (WTWHA) in northeast Queensland is home to approximately 18 percent of the nation's total vascular plant species. Over the past century, human activity and industrial development have caused global climate changes, posing a severe and irreversible danger to the entire land-based ecosystem, and the WTWHA is no exception. The current average annual temperature of WTWHA in northeast Queensland is 24 °C. However, in the coming years (by 2030), the average annual temperature increase is estimated to be between 0.5 and 1.4 °C compared to the climate observed between 1986 and 2005. Looking further ahead to 2070, the anticipated temperature rise is projected to be between 1.0 and 3.2 °C, with the exact range depending on future emissions. We identified 84 plant species, endemic to tropical montane cloud forests (TMCF) within the WTWHA, which are already experiencing climate change threats. Some of these plants are used in herbal medicines. This study comprehensively reviewed the metabolomics studies conducted on these 84 plant species until now toward understanding their physiological and metabolomics responses to global climate change. This review also discusses the following: (i) recent developments in plant metabolomics studies that can be applied to study and better understand the interactions of wet tropics plants with climatic stress, (ii) medicinal plants and isolated phytochemicals with structural diversity, and (iii) reported biological activities of crude extracts and isolated compounds.
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Affiliation(s)
- Ngawang Gempo
- Australian Institute of Tropical Health and Medicine (AITHM), James Cook University, Nguma-bada Campus, McGregor Rd., Cairns, QLD 4878, Australia; (N.G.); (P.W.)
- College of Public Health, Medical and Veterinary Services (CPHMVS), James Cook University, Nguma-bada Campus, McGregor Rd., Cairns, QLD 4878, Australia
| | - Karma Yeshi
- Australian Institute of Tropical Health and Medicine (AITHM), James Cook University, Nguma-bada Campus, McGregor Rd., Cairns, QLD 4878, Australia; (N.G.); (P.W.)
- College of Public Health, Medical and Veterinary Services (CPHMVS), James Cook University, Nguma-bada Campus, McGregor Rd., Cairns, QLD 4878, Australia
| | - Darren Crayn
- Australian Tropical Herbarium (ATH), James Cook University, Nguma-bada Campus, McGregor Rd., Cairns, QLD 4878, Australia;
| | - Phurpa Wangchuk
- Australian Institute of Tropical Health and Medicine (AITHM), James Cook University, Nguma-bada Campus, McGregor Rd., Cairns, QLD 4878, Australia; (N.G.); (P.W.)
- College of Public Health, Medical and Veterinary Services (CPHMVS), James Cook University, Nguma-bada Campus, McGregor Rd., Cairns, QLD 4878, Australia
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Bioactive Phenolic Compounds from Peperomia obtusifolia. Molecules 2022; 27:molecules27144363. [PMID: 35889234 PMCID: PMC9315869 DOI: 10.3390/molecules27144363] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 07/04/2022] [Accepted: 07/05/2022] [Indexed: 02/01/2023] Open
Abstract
Peperomia obtusifolia (L.) A. Dietr., native to Middle America, is an ornamental plant also traditionally used for its mild antimicrobial properties. Chemical investigation on the leaves of P. obtusifolia resulted in the isolation of two previously undescribed compounds, named peperomic ester (1) and peperoside (2), together with five known compounds, viz. N-[2-(3,4-dihydroxyphenyl)ethyl]-3,4-dihydroxybenzamide (3), becatamide (4), peperobtusin A (5), peperomin B (6), and arabinothalictoside (7). The structures of these compounds were elucidated by 1D and 2D NMR techniques and HREIMS analyses. Compounds 1–7 were evaluated for their anthelmintic (against Caenorhabditis elegans), antifungal (against Botrytis cinerea, Septoria tritici and Phytophthora infestans), antibacterial (against Bacillus subtilis and Aliivibrio fischeri), and antiproliferative (against PC-3 and HT-29 human cancer cell lines) activities. The known peperobtusin A (5) was the most active compound against the PC-3 cancer cell line with IC50 values of 25.6 µM and 36.0 µM in MTT and CV assays, respectively. This compound also induced 90% inhibition of bacterial growth of the Gram-positive B. subtilis at a concentration of 100 µM. In addition, compound 3 showed anti-oomycotic activity against P. infestans with an inhibition value of 56% by using a concentration of 125 µM. However, no anthelmintic activity was observed.
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Al-Madhagi WM, Hashim NM, Awadh Ali NA, Taha H, Alhadi AA, Abdullah AA, Sharhan O, Othman R. Bioassay-Guided Isolation and in Silico Study of Antibacterial Compounds From Petroleum Ether Extract of Peperomia blanda (Jacq.) Kunth. J Chem Inf Model 2019; 59:1858-1872. [PMID: 31117526 DOI: 10.1021/acs.jcim.8b00969] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Bioassay-guided isolation protocol was performed on petroleum ether extract of Peperomia blanda (Jacq.) Kunth using column chromatographic techniques. Five compounds were isolated and their structures were elucidated via one-dimensional (1D) and two-dimensional (2D) NMR, gas chromatography mass sectroscopy (GCMS), liquid chromatography mass spectroscopy (LCMS), and ultraviolet (UV) and infrared (IR) analyses. Dindygulerione E (a new compound), and two compounds isolated from P. blanda for the first time-namely, dindygulerione A and flavokawain A-are reported herein. Antimicrobial activity was screened against selected pathogenic microbes, and minimum inhibitory concentrations (MIC) were recorded within the range of 62-250 μg/mL. Assessment of the pharmacotherapeutic potential has also been done for the isolated compounds, using the Prediction of Activity spectra for Substances (PASS) software, and different activities of compounds were predicted. Molecular docking, molecular dynamics simulation and molecular mechanics/Poisson-Boltzmann Surface Area (MM-PBSA) calculations have proposed the binding affinity of these compounds toward methylthioadenosine phosphorylase enzyme, which may explain their inhibitory actions.
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Affiliation(s)
- Wafa M Al-Madhagi
- Pharmacy Department, Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia.,Department of Pharmaceutical Medicinal and Organic Chemistry, Faculty of Pharmacy , Sana'a University , 31220 Sana'a , Yemen
| | - Najihah Mohd Hashim
- Pharmacy Department, Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia.,Center for Natural Products Research and Drug Discovery (CENAR) , University of Malaya , 50603 Kuala Lumpur , Malaysia
| | - Nasser A Awadh Ali
- Department of Pharmacognosy, Faculty of Pharmacy , Sana'a University , 31220 Sana'a , Yemen
| | - Hairin Taha
- Institute of Energy Infrastructure , Universiti Tenaga Nasional , 43000 Selangor , Malaysia
| | - Abeer A Alhadi
- Pharmacy Department, Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia.,Drug Design and Development Research Group (DDDRG) , University of Malaya , 50603 Kuala Lumpur , Malaysia
| | - Adib A Abdullah
- Pharmacy Department, Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia.,Drug Design and Development Research Group (DDDRG) , University of Malaya , 50603 Kuala Lumpur , Malaysia
| | - Olla Sharhan
- Chemistry Department, Faculty of Science , University of Malaya , 50603 Kuala Lumpur , Malaysia.,Chemistry Department, Faculty of Education , Dhamar University , 87246 Dhamar , Yemen
| | - Rozana Othman
- Pharmacy Department, Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia.,Center for Natural Products Research and Drug Discovery (CENAR) , University of Malaya , 50603 Kuala Lumpur , Malaysia.,Drug Design and Development Research Group (DDDRG) , University of Malaya , 50603 Kuala Lumpur , Malaysia
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