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Wang J, Wang D, Feng L, Li X, Gong Y, Wang Z, Tan N, Han J. Eremophilane-type and xanthanolide-type sesquiterpenes from the aerial parts of Xanthium sibiricum and their anti-inflammatory activities. PHYTOCHEMISTRY 2023; 208:113603. [PMID: 36720451 DOI: 10.1016/j.phytochem.2023.113603] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 01/26/2023] [Accepted: 01/27/2023] [Indexed: 06/18/2023]
Abstract
The traditional Chinese medicine Xanthium sibiricum Patrin ex Widder is used to treat wind-cold headache, nasal congestion, nasal discharge, allergic rhinitis, sinusitis, urticaria, and arthritis. Our previous studies found that sesquiterpene lactones, the main bioactive constituents of X. sibiricum, relieved airway inflammation in an asthma mouse model. To obtain active sesquiterpenes, five undescribed ones, including a pair of eremophilanes and three xanthanolides, together with eight known xanthanolides were isolated from X. sibiricum. Their structures were identified by IR, UV, HR-ESI-MS and NMR spectroscopic data, and their absolute configurations were determined by X-ray crystallographic diffraction analysis and the comparison between their experimental and calculated electronic circular dichroism. All isolated compounds were evaluated for their inhibitory effects on nitric oxide production, and Tnf-α, Il-1β, and Il-6 mRNA expression induced by lipopolysaccharide in the macrophage cell line RAW264.7. Further investigation showed that xanthsibiriolide and 11β-hydroxyl-13-chloro-8-epi-xanthatin exerted their anti-inflammatory effects by inhibiting the PI3K/AKT/mTOR signaling pathway. Analysis of the structure-activity relationships indicated that the α,β-unsaturated lactone ring and the 1,5-epoxide group might be the bioactive groups of xanthanolides, and these results provide a basis for further exploration of sesquiterpene-type lead compounds with anti-inflammatory activity.
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Affiliation(s)
- Jingwen Wang
- Department of TCMs Pharmaceuticals, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, 211198, PR China
| | - Dongsheng Wang
- Department of Orthopedics, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, 210002, PR China
| | - Li Feng
- Department of TCMs Pharmaceuticals, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, 211198, PR China
| | - Xin Li
- Department of TCMs Pharmaceuticals, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, 211198, PR China
| | - Yuanxiang Gong
- Department of TCMs Pharmaceuticals, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, 211198, PR China
| | - Zhe Wang
- Department of TCMs Pharmaceuticals, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, 211198, PR China.
| | - Ninghua Tan
- Department of TCMs Pharmaceuticals, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, 211198, PR China.
| | - Jing Han
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, 210023, PR China.
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2
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de Andrade RS, Sales KA, Abreu LS, Campos VR, Dos Santos Junior FM, Braz-Filho R, Scotti MT, Tavares JF, da Silva MS. Structure Revision of the Sesquiterpene Nordine Based on NMR Spectroscopic Analysis and X-ray Crystallography. JOURNAL OF NATURAL PRODUCTS 2022; 85:2480-2483. [PMID: 36254387 DOI: 10.1021/acs.jnatprod.2c00828] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Nordine was reported to be an unusual humulene-type macrocyclic sesquiterpenoid that contains an ether-bridged bicyclic ring between C-10 and C-6 with a hydroxy group at position 2. Here, we report the structure revision of nordine based on incongruities found for carbon chemical shifts in the originally proposed structure, in addition to formation of a diacetylated derivative. As expected, a single-crystal X-ray diffraction analysis unambiguously confirmed our proposal that the nordine (1) structure contains an ether-bridged bicyclic ring between C-10 and C-7 and hydroxy groups at C-2 and C-6. Furthermore, the absolute configuration was determined by ECD spectroscopic analysis.
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Affiliation(s)
- Rodrigo Silva de Andrade
- Postgraduate Program in Natural and Synthetic Bioactive Products, Federal University of Paraiba, João Pessoa 58051-900, Brazil
| | - Kaio Aragão Sales
- Postgraduate Program in Natural and Synthetic Bioactive Products, Federal University of Paraiba, João Pessoa 58051-900, Brazil
| | - Lucas Silva Abreu
- Department of Organic Chemistry, Institute of Chemistry, Fluminense Federal University, Rio de Janeiro 24020-141, Brazil
| | - Vinícius Rangel Campos
- Department of Organic Chemistry, Institute of Chemistry, Fluminense Federal University, Rio de Janeiro 24020-141, Brazil
| | | | - Raimundo Braz-Filho
- Department of Chemistry, Institute of Chemistry, Federal Rural University of Rio de Janeiro, Seropédica 23890-000, Brazil
| | - Marcus Tullius Scotti
- Postgraduate Program in Natural and Synthetic Bioactive Products, Federal University of Paraiba, João Pessoa 58051-900, Brazil
| | - Josean Fechine Tavares
- Postgraduate Program in Natural and Synthetic Bioactive Products, Federal University of Paraiba, João Pessoa 58051-900, Brazil
| | - Marcelo Sobral da Silva
- Postgraduate Program in Natural and Synthetic Bioactive Products, Federal University of Paraiba, João Pessoa 58051-900, Brazil
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3
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Li YT, Fu J, Wang HQ, Qu J, Yu SS. Six new sesquiterpenoids from the fruits of Xanthium italicum. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2022; 24:925-934. [PMID: 35899696 DOI: 10.1080/10286020.2022.2099385] [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: 05/28/2022] [Revised: 07/04/2022] [Accepted: 07/04/2022] [Indexed: 06/15/2023]
Abstract
Four new germacrane-type sesquiterpenoids (1-4) and two new guaiane-type sesquiterpenoids (5-6) were isolated from the fruits of Xanthium italicum Moretti. The structures of the new compounds were elucidated on the basis of spectroscopic analysis and X-ray diffraction experiment. Compounds 1, 2 and 6 showed the anti-inflammatory effects against the activation of NF-κB induced by lipopolysaccharide (LPS) with IC50 values of 20.12, 22.89 and 68.66 µM, respectively.
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Affiliation(s)
- Yu-Tong Li
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Jiang Fu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Hai-Qiang Wang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Jing Qu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Shi-Shan Yu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
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Shabana, Barkatullah, Nafees M. Pharmacognostic standardization of
Xanthium spinosum
L
. through scanning electron microscopy and analytical techniques. Microsc Res Tech 2022; 85:3736-3754. [DOI: 10.1002/jemt.24224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Revised: 06/20/2022] [Accepted: 08/05/2022] [Indexed: 11/09/2022]
Affiliation(s)
- Shabana
- Department of Botany Islamia College Peshawar Peshawar Pakistan
| | - Barkatullah
- Department of Botany Islamia College Peshawar Peshawar Pakistan
| | - Muhammad Nafees
- Department of Botany University of Peshawar Peshawar Pakistan
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Pescitelli G. ECD exciton chirality method today: a modern tool for determining absolute configurations. Chirality 2021; 34:333-363. [PMID: 34791704 PMCID: PMC9299504 DOI: 10.1002/chir.23393] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 10/26/2021] [Accepted: 10/27/2021] [Indexed: 02/02/2023]
Abstract
The application of the exciton chirality method (ECM) to interpret electronic circular dichroism (ECD) spectra is a well‐established and still popular approach to assign the absolute configuration (AC) of natural products, chiral organic compounds, and organometallic species. The method applies to compounds containing at least two chromophores with electric dipole allowed transitions (e.g., π–π* transitions). The exciton chirality rule correlates the sign of an exciton couplet (two ECD bands with opposite sign and similar intensity) with the overall molecular stereochemistry, including the AC. A correct application of the ECM requires three main prerequisites: (a) the knowledge of the molecular conformation, (b) the knowledge of the directions of the electric transition moments (TDMs), and (c) the assumption that the exciton coupling mechanism must be the major source of the observed ECD signals. All these prerequisites can be easily verified by means of quantum‐mechanical (QM) calculations. In the present review, we shortly introduce the general principles that underpin the use of the ECM for configurational assignments and survey its applications, both classic ones and some reported in the recent literature. Based on these examples, we will stress the advantages of the ECM but also the key requisites for its correct application. Additionally, we will discuss the dependence of the couplet sign on geometrical parameters (angles α,β,γ between TDMs), which can be helpful for discerning the sign of exciton chirality in ambiguous situations. Finally, we will present a molecular orbital (MO) description of the exciton coupling phenomenon.
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Affiliation(s)
- Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy
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