1
|
Liu X, Zhou M, He S, Xu Q, Du C, Zhu H, Lin T, Wang G, Tian W, Chen H. Polyhydric Stigmastane-Type Steroids Derivative from Vernonia amygdalina and Their Anti-Neuroinflammatory Activity. Pharmaceuticals (Basel) 2022; 15:ph15091160. [PMID: 36145381 PMCID: PMC9506346 DOI: 10.3390/ph15091160] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 09/15/2022] [Accepted: 09/15/2022] [Indexed: 11/27/2022] Open
Abstract
Vernonia amygdalina Del. is a traditional medicinal plant and vegetable originating from tropical Africa. The phytochemical investigation of V. amygdalina led to eight undescribed polyhydric stigmastane-type steroids, vernonin M–T (1–8). Their gross structures and stereochemistry were elucidated by HR-ESI-MS, 1D and 2D NMR spectra, X-ray diffraction, quantum chemical computation of the ECD spectrum, and the in situ dimolybdenum CD method. The anti-neuroinflammatory activity of the isolated compounds was performed in BV-2 microglia cells. As a result, compound 1 displayed a notable anti-neuroinflammatory effect via suppressing the LPS-induced IκB degradation and restricting the activation of the PI3K/AKT and p38 MAPK pathways.
Collapse
|
2
|
Li G, Li M, Xia Z, Tan Z, Deng W, Fang C. Direct Synthesis of Amides from Benzonitriles and Benzylic Alcohols via a KO t-Bu-Mediated MPV-type Hydrogen Transfer Process. J Org Chem 2022; 87:8884-8891. [PMID: 35758138 DOI: 10.1021/acs.joc.2c00402] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Meerwein-Ponndorf-Verley (MPV)-type reduction between benzonitriles and benzylic alcohols under transition-metal-free conditions has been demonstrated for the first time. Using simple KOt-Bu as the base, various benzonitriles can be efficiently reduced by benzylic alcohols via hydrogen transfer reduction, and the resultant phenyl imine can react further with benzylic alcohols to give amides as the final product in which both the alcohols and the nitriles are incorporated. Preliminary mechanistic investigations indicated that the reaction may go through multiple MPV-type hydrogen transfer processes.
Collapse
Affiliation(s)
- Gaolin Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Meichen Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Zhen Xia
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Ze Tan
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Wei Deng
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Chen Fang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| |
Collapse
|
3
|
Lin Y, Zhao WR, Shi WT, Zhang J, Zhang KY, Ding Q, Chen XL, Tang JY, Zhou ZY. Pharmacological Activity, Pharmacokinetics, and Toxicity of Timosaponin AIII, a Natural Product Isolated From Anemarrhena asphodeloides Bunge: A Review. Front Pharmacol 2020; 11:764. [PMID: 32581782 PMCID: PMC7283383 DOI: 10.3389/fphar.2020.00764] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Accepted: 05/07/2020] [Indexed: 12/13/2022] Open
Abstract
Anemarrhena asphodeloides Bunge is a famous Chinese Materia Medica and has been used in traditional Chinese medicine for more than two thousand years. Steroidal saponins are important active components isolated from A. asphodeloides Bunge. Among which, the accumulation of numerous experimental studies involved in Timosaponin AIII (Timo AIII) draws our attention in the recent decades. In this review, we searched all the scientific literatures using the key word "timosaponin AIII" in the PubMed database update to March 2020. We comprehensively summarized the pharmacological activity, pharmacokinetics, and toxicity of Timo AIII. We found that Timo AIII presents multiple-pharmacological activities, such as anti-cancer, anti-neuronal disorders, anti-inflammation, anti-coagulant, and so on. And the anti-cancer effect of Timo AIII in various cancers, especially hepatocellular cancer and breast cancer, is supposed as its most potential activity. The anti-inflammatory activity of Timo AIII is also beneficial to many diseases. Moreover, VEGFR, X-linked inhibitor of apoptosis protein (XIAP), B-cell-specific Moloney murine leukemia virus integration site 1 (BMI1), thromboxane (Tx) A2 receptor, mTOR, NF-κB, COX-2, MMPs, acetylcholinesterase (AChE), and so on are identified as the crucial pharmacological targets of Timo AIII. Furthermore, the hepatotoxicity of Timo AIII was most concerned, and the pharmacokinetics and toxicity of Timo AIII need further studies in diverse animal models. In conclusion, Timo AIII is potent as a compound or leading compound for further drug development while still needs in-depth studies.
Collapse
Affiliation(s)
- Yan Lin
- Department of Cardiovascular Research Laboratory, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
- Department of Oncology, The Fourth Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Wai-Rong Zhao
- Department of Cardiovascular Research Laboratory, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Wen-Ting Shi
- Department of Cardiovascular Research Laboratory, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Jing Zhang
- Department of Cardiovascular Research Laboratory, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Kai-Yu Zhang
- Department of Cardiovascular Research Laboratory, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Qian Ding
- College of Basic Medicine, Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Xin-Lin Chen
- Department of Cardiovascular Research Laboratory, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Jing-Yi Tang
- Department of Cardiovascular Research Laboratory, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Zhong-Yan Zhou
- Department of Cardiovascular Research Laboratory, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
- State Key Laboratory of Quality Research in Chinese Medicine and Institute of Chinese Medical Sciences, University of Macau, Macao, Macau
| |
Collapse
|
4
|
Zeng S, Liu J, Anankanbil S, Chen M, Guo Z, Adams JP, Snajdrova R, Li Z. Amide Synthesis via Aminolysis of Ester or Acid with an Intracellular Lipase. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02713] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shichao Zeng
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore
| | - Ji Liu
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore
| | - Sampson Anankanbil
- Department of Engineering, Faculty of Science and Technology, Aarhus University, 8000 Aarhus, Denmark
| | - Ming Chen
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore
| | - Zheng Guo
- Department of Engineering, Faculty of Science and Technology, Aarhus University, 8000 Aarhus, Denmark
| | - Joseph P. Adams
- Chemical Sciences, GSK R&D Medicines Research Centre, Gunnelswood Road, Stevenage, SG1 2NY, United Kingdom
| | - Radka Snajdrova
- Chemical Sciences, GSK R&D Medicines Research Centre, Gunnelswood Road, Stevenage, SG1 2NY, United Kingdom
| | - Zhi Li
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore
| |
Collapse
|
5
|
Powell AD, Grafton G, Roberts A, Larkin S, O'Neill N, Palandri J, Otvos R, Cooper AJ, Ulens C, Barnes NM. Novel mechanism of modulation at a ligand-gated ion channel; action of 5-Cl-indole at the 5-HT 3 A receptor. Br J Pharmacol 2016; 173:3467-3479. [PMID: 27677804 DOI: 10.1111/bph.13638] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 09/09/2016] [Accepted: 09/16/2016] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND AND PURPOSE The 5-HT3 receptor is a prototypical member of the Cys-loop ligand-gated ion channel (LGIC) superfamily and an established therapeutic target. In addition to activation via the orthosteric site, receptor function can be modulated by allosteric ligands. We have investigated the pharmacological action of Cl-indole upon the 5-HT3 A receptor and identified that this positive allosteric modulator possesses a novel mechanism of action for LGICs. EXPERIMENTAL APPROACH The impact of Cl-indole upon the 5-HT3 receptor was assessed using single cell electrophysiological recordings and [3 H]-granisetron binding in HEK293 cells stably expressing the 5-HT3 receptor. KEY RESULTS Cl-indole failed to evoke 5-HT3 A receptor-mediated responses (up to 30 μM) or display affinity for the [3 H]-granisetron binding site. However, in the presence of Cl-indole, termination of 5-HT application revealed tail currents mediated via the 5-HT3 A receptor that were independent of the preceding 5-HT concentration but were antagonized by the 5-HT3 receptor antagonist, ondansetron. These tail currents were absent in the 5-HT3 AB receptor. Furthermore, the presence of 5-HT revealed a concentration-dependent increase in the affinity of Cl-indole for the orthosteric binding site of the human 5-HT3 A receptor. CONCLUSIONS AND IMPLICATIONS Cl-indole acts as both an orthosteric agonist and an allosteric modulator, but the presence of an orthosteric agonist (e.g. 5-HT) is a prerequisite to reveal both actions. Precedent for ago-allosteric action is available, yet the essential additional presence of an orthosteric agonist is now reported for the first time. This widening of the pharmacological mechanisms to modulate LGICs may offer further therapeutic opportunities.
Collapse
Affiliation(s)
- Andrew D Powell
- Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK.,School of Nursing Midwifery and Social Work, Birmingham City University, Edgbaston, UK
| | - Gillian Grafton
- Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Alexander Roberts
- Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Shannon Larkin
- Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Nathanael O'Neill
- Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Josephine Palandri
- Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Reka Otvos
- Department of Molecular and Cellular Neurobiology, VU University Amsterdam, Amsterdam, The Netherlands
| | - Alison J Cooper
- Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Chris Ulens
- Laboratory of Structural Neurobiology, KU Leuven, Leuven, Belgium
| | - Nicholas M Barnes
- Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK.,Department of Pharmacology and Therapeutics, School of Biomedical Sciences, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville, Victoria, Australia
| |
Collapse
|
6
|
Gasiorek A, Trattnig SM, Ahring PK, Kristiansen U, Frølund B, Frederiksen K, Jensen AA. Delineation of the functional properties and the mechanism of action of TMPPAA, an allosteric agonist and positive allosteric modulator of 5-HT3 receptors. Biochem Pharmacol 2016; 110-111:92-108. [DOI: 10.1016/j.bcp.2016.04.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2016] [Accepted: 04/06/2016] [Indexed: 10/21/2022]
|
7
|
Selvakumar J, Grandhi GS, Sahoo H, Baidya M. Copper-mediated etherification of arenes with alkoxysilanes directed by an (2-aminophenyl)pyrazole group. RSC Adv 2016. [DOI: 10.1039/c6ra18861c] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
(2-Aminophenyl)pyrazole directed copper mediated C–H etherification of (hetero)arenes is described.
Collapse
Affiliation(s)
- Jayaraman Selvakumar
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai – 600 036
- India
| | - Gowri Sankar Grandhi
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai – 600 036
- India
| | - Harekrishna Sahoo
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai – 600 036
- India
| | - Mahiuddin Baidya
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai – 600 036
- India
| |
Collapse
|
8
|
Hu XQ. Auto-inhibition at a ligand-gated ion channel: a cross-talk between orthosteric and allosteric sites. Br J Pharmacol 2014; 172:93-105. [PMID: 25176133 DOI: 10.1111/bph.12896] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2014] [Revised: 08/14/2014] [Accepted: 08/24/2014] [Indexed: 01/29/2023] Open
Abstract
BACKGROUND AND PURPOSE A ligand is believed to produce either positive or negative responses, or to block both of them. However, an indole compound was found to promote both positive and negative effects at the 5-HT3 AB receptor, which displays a low level of spontaneous activity. The present study attempted to delineate the mechanisms underlying this phenomenon. EXPERIMENTAL APPROACH The spontaneously active V291S 5-HT3 A receptor was used to explore the properties of 5-hydroxyindole (5-HoI) and 5-methoxyindole (5-MoI), structural analogues of 5-HT, either alone or in combination with orthosteric probes. KEY RESULTS Two types of efficacy switching were initiated by altering ligand structure and concentration. At lower concentrations, a subtle structural change at position 5 of the indole molecule resulted in opposite effects. 5-HoI apparently elicited partial allosteric inverse agonism, whereas 5-MoI induced allosteric agonism. Interestingly, at a higher concentration, these indoles produced distinct auto-inhibition, manifested as a switch from positive to negative effects. 5-HoI induced a transition from orthosteric agonism to allosteric inverse agonism, whereas 5-MoI produced a shift from allosteric agonism to orthosteric inverse agonism. The auto-inhibition appears to involve communication between orthosteric and allosteric sites of the active receptor conformation and/or between inactive and active conformations. An additive effect of orthosteric and allosteric inverse agonism and insensitivity of allosteric agonism to orthosteric antagonism were also demonstrated. CONCLUSIONS AND IMPLICATIONS Together, the results suggest that the moiety at position 5 of the indole structure is a critical determinant of a ligand's properties at the 5-HT3 A receptor, providing new insights into understanding ligand-receptor interactions.
Collapse
Affiliation(s)
- Xiang-Qun Hu
- Department of Biomedical Sciences, College of Health Sciences, Marquette University, Milwaukee, WI, USA
| |
Collapse
|
9
|
Thompson AJ. Recent developments in 5-HT3 receptor pharmacology. Trends Pharmacol Sci 2013; 34:100-9. [DOI: 10.1016/j.tips.2012.12.002] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Revised: 12/07/2012] [Accepted: 12/10/2012] [Indexed: 12/19/2022]
|
10
|
Verheij MHP, Thompson AJ, van Muijlwijk-Koezen JE, Lummis SCR, Leurs R, de Esch IJP. Design, synthesis, and structure-activity relationships of highly potent 5-HT₃ receptor ligands. J Med Chem 2012; 55:8603-14. [PMID: 23006041 PMCID: PMC3504484 DOI: 10.1021/jm300801u] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
![]()
The 5-HT3 receptor, a pentameric ligand-gated
ion channel
(pLGIC), is an important therapeutic target. During a recent fragment
screen, 6-chloro-N-methyl-2-(4-methyl-1,4-diazepan-1-yl)quinazolin-4-amine
(1) was identified as a 5-HT3R hit fragment.
Here we describe the synthesis and structure–activity relationships
(SAR) of a series of (iso)quinoline and quinazoline compounds that
were synthesized and screened for 5-HT3R affinity using
a [3H]granisetron displacement assay. These studies resulted
in the discovery of several high affinity ligands of which compound 22 showed the highest affinity (pKi > 10) for the 5-HT3 receptor. The observed SAR is
in
agreement with established pharmacophore models for 5-HT3 ligands and is used for ligand–receptor binding mode prediction
using homology modeling and in silico docking approaches.
Collapse
Affiliation(s)
- Mark H P Verheij
- Leiden/Amsterdam Center of Drug Research-LACDR, Amsterdam Institute for Molecules Medicines and Systems-AIMMS, Division of Medicinal Chemistry, Faculty of Sciences, VU University Amsterdam, Amsterdam, The Netherlands
| | | | | | | | | | | |
Collapse
|
11
|
Gabriele B, Mancuso R, Maltese V, Veltri L, Salerno G. Synthesis of Furan-3-carboxylic and 4-Methylene-4,5-dihydrofuran-3-carboxylic Esters by Direct Palladium Iodide Catalyzed Oxidative Carbonylation of 3-Yne-1,2-diol Derivatives. J Org Chem 2012; 77:8657-68. [DOI: 10.1021/jo301628n] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Bartolo Gabriele
- Dipartimento di Scienze Farmaceutiche and ‡Dipartimento di Chimica, Università della Calabria, 87036
Arcavacata di Rende (CS), Italy
| | - Raffaella Mancuso
- Dipartimento di Scienze Farmaceutiche and ‡Dipartimento di Chimica, Università della Calabria, 87036
Arcavacata di Rende (CS), Italy
| | - Vito Maltese
- Dipartimento di Scienze Farmaceutiche and ‡Dipartimento di Chimica, Università della Calabria, 87036
Arcavacata di Rende (CS), Italy
| | - Lucia Veltri
- Dipartimento di Scienze Farmaceutiche and ‡Dipartimento di Chimica, Università della Calabria, 87036
Arcavacata di Rende (CS), Italy
| | - Giuseppe Salerno
- Dipartimento di Scienze Farmaceutiche and ‡Dipartimento di Chimica, Università della Calabria, 87036
Arcavacata di Rende (CS), Italy
| |
Collapse
|
12
|
Trattnig SM, Harpsøe K, Thygesen SB, Rahr LM, Ahring PK, Balle T, Jensen AA. Discovery of a novel allosteric modulator of 5-HT3 receptors: inhibition and potentiation of Cys-loop receptor signaling through a conserved transmembrane intersubunit site. J Biol Chem 2012; 287:25241-54. [PMID: 22589534 DOI: 10.1074/jbc.m112.360370] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The ligand-gated ion channels in the Cys-loop receptor superfamily mediate the effects of neurotransmitters acetylcholine, serotonin, GABA, and glycine. Cys-loop receptor signaling is susceptible to modulation by ligands acting through numerous allosteric sites. Here we report the discovery of a novel class of negative allosteric modulators of the 5-HT(3) receptors (5-HT(3)Rs). PU02 (6-[(1-naphthylmethyl)thio]-9H-purine) is a potent and selective antagonist displaying IC(50) values of ~1 μM at 5-HT(3)Rs and substantially lower activities at other Cys-loop receptors. In an elaborate mutagenesis study of the 5-HT(3)A receptor guided by a homology model, PU02 is demonstrated to act through a transmembrane intersubunit site situated in the upper three helical turns of TM2 and TM3 in the (+)-subunit and TM1 and TM2 in the (-)-subunit. The Ser(248), Leu(288), Ile(290), Thr(294), and Gly(306) residues are identified as important molecular determinants of PU02 activity with minor contributions from Ser(292) and Val(310), and we propose that the naphthalene group of PU02 docks into the hydrophobic cavity formed by these. Interestingly, specific mutations of Ser(248), Thr(294), and Gly(306) convert PU02 into a complex modulator, potentiating and inhibiting 5-HT-evoked signaling through these mutants at low and high concentrations, respectively. The PU02 binding site in the 5-HT(3)R corresponds to allosteric sites in anionic Cys-loop receptors, which emphasizes the uniform nature of the molecular events underlying signaling through the receptors. Moreover, the dramatic changes in the functional properties of PU02 induced by subtle changes in its binding site bear witness to the delicate structural discrimination between allosteric inhibition and potentiation of Cys-loop receptors.
Collapse
Affiliation(s)
- Sarah M Trattnig
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | | | | | | | | | | | | |
Collapse
|