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Banoo R, Nuthakki VK, Wadje BN, Sharma A, Bharate SB. Design, synthesis, and pharmacological evaluation of indole-piperidine amides as Blood-brain barrier permeable dual cholinesterase and β-secretase inhibitors. Eur J Med Chem 2024; 266:116131. [PMID: 38215587 DOI: 10.1016/j.ejmech.2024.116131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 12/30/2023] [Accepted: 01/05/2024] [Indexed: 01/14/2024]
Abstract
Heterocyclic compounds play a crucial role in the discovery of therapeutics. Alzheimer's disease (AD) is an unfathomable sporadic neurodegenerative disorder that involves multiple pathological pathways. The failure of current single-target small molecules to address AD's underlying causes has prompted interest in discovering multi-target directed ligands (MTDLs) to slow down the disease's progression. Herein we report the synthesis and biological evaluation of indole-piperidine amides as MTDLs for AD. The 5,6-dimethoxy-indole N-(2-(1-benzylpiperidine) carboxamide (23a) inhibits hAChE and hBACE-1 with IC50 values of 0.32 and 0.39 μM, respectively. The MTDL 23a is a mixed-type inhibitor of both hAChE and hBACE-1 with Ki values of 0.26 μM and 0.46 μM, respectively. The MD simulation studies revealed that both AChE and BACE-1 experience minor conformational changes on binding with 23a. In the PAMPA-BBB assay, analog 23a demonstrated CNS permeability, indicating the possibility for future investigation in preclinical models of AD.
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Affiliation(s)
- Razia Banoo
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu, 180001, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Vijay K Nuthakki
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu, 180001, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Bhagyashri N Wadje
- Department of Natural Products & Medicinal Chemistry, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad, 500007, Telangana, India
| | - Ankita Sharma
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu, 180001, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Sandip B Bharate
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu, 180001, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, 201002, India; Department of Natural Products & Medicinal Chemistry, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad, 500007, Telangana, India.
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Sharma M, Sharma A, Thakur S, Nuthakki VK, Jamwal A, Nandi U, Jadhav HR, Bharate SB. Discovery of blood-brain barrier permeable and orally bioavailable caffeine-based amide derivatives as acetylcholinesterase inhibitors. Bioorg Chem 2023; 139:106719. [PMID: 37473478 DOI: 10.1016/j.bioorg.2023.106719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 06/10/2023] [Accepted: 07/06/2023] [Indexed: 07/22/2023]
Abstract
Caffeine is one of the privileged natural products that shows numerous effects on the central nervous system. Herein, thirty-one caffeine-based amide derivatives were synthesized and evaluated in vitro for their anticholinesterase activity. The introduction of the amide group to the caffeine core augmented its anticholinesterase activity from an IC50 value of 128 to 1.32 µM (derivative, 6i). The SAR study revealed that N7 substitution on caffeine core is favorable over N1, and the presence of amide 'carbonyl' as a part of the linker contributes to the biological activity. The caffeine core of 6i exhibits interactions with the peripheral anionic site, whereas the N-benzyl ring fits nicely inside the catalytic anionic site. Analog 6i inhibits AChE in a mixed-type mode (Ki 4.58 µM) and crosses the BBB in an in-vitro PAMPA assay. Compound 6i has a descent metabolic stability in MLM (>70% remaining after 30 min) and favorable oral pharmacokinetics in Swiss albino mice.
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Affiliation(s)
- Mohit Sharma
- Natural Products and Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India; Academy of Scientific & Innovative Research, Ghaziabad 201002, India
| | - Ankita Sharma
- Natural Products and Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India; Academy of Scientific & Innovative Research, Ghaziabad 201002, India
| | - Shikha Thakur
- Department of Pharmacy, Birla Institute of Technology and Sciences Pilani, Pilani Campus, Vidya Vihar, Pilani 333031, Rajasthan, India
| | - Vijay K Nuthakki
- Natural Products and Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India; Academy of Scientific & Innovative Research, Ghaziabad 201002, India
| | - Ashiya Jamwal
- Academy of Scientific & Innovative Research, Ghaziabad 201002, India; Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
| | - Utpal Nandi
- Academy of Scientific & Innovative Research, Ghaziabad 201002, India; Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
| | - Hemant R Jadhav
- Department of Pharmacy, Birla Institute of Technology and Sciences Pilani, Pilani Campus, Vidya Vihar, Pilani 333031, Rajasthan, India
| | - Sandip B Bharate
- Natural Products and Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India; Academy of Scientific & Innovative Research, Ghaziabad 201002, India; Department of Natural Products and Medicinal Chemistry, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500007, India.
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Abdullaha M, Banoo R, Nuthakki VK, Sharma M, Kaur S, Thakur S, Kumar A, Jadhav HR, Bharate SB. Methoxy-naphthyl-Linked N-Benzyl Pyridinium Styryls as Dual Cholinesterase Inhibitors: Design, Synthesis, Biological Evaluation, and Structure-Activity Relationship. ACS Omega 2023; 8:17591-17608. [PMID: 37251153 PMCID: PMC10210183 DOI: 10.1021/acsomega.2c08167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Accepted: 04/25/2023] [Indexed: 05/31/2023]
Abstract
The multifaceted nature of Alzheimer's disease (AD) indicates the need for multitargeted agents as potential therapeutics. Both cholinesterases (ChEs), acetylcholinesterase (AChE) and butyrylcholinesterase (BChE), play a vital role in disease progression. Thus, inhibiting both ChEs is more beneficial than only one for effectively managing AD. The present study provides a detailed lead optimization of the e-pharmacophore-generated pyridinium styryl scaffold to discover a dual ChE inhibitor. A structure-activity relationship analysis indicated the importance of three structural fragments, methoxy-naphthyl, vinyl-pyridinium, and substituted-benzyl, in a dual ChE inhibitor pharmacophore. The optimized 6-methoxy-naphthyl derivative, 7av (SB-1436), inhibits EeAChE and eqBChE with IC50 values of 176 and 370 nM, respectively. The kinetic study has shown that 7av inhibits AChE and BChE in a non-competitive manner with ki values of 46 and 115 nM, respectively. The docking and molecular dynamics simulation demonstrated that 7av binds with the catalytic and peripheral anionic sites of AChE and BChE. Compound 7av also significantly stops the self-aggregation of Aβ. The data presented herein indicate the potential of 7av for further investigation in preclinical models of AD.
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Affiliation(s)
- Mohd Abdullaha
- Natural
Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
- Academy
of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Razia Banoo
- Natural
Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
- Academy
of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Vijay K. Nuthakki
- Natural
Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
- Academy
of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Mohit Sharma
- Natural
Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
- Academy
of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Sukhleen Kaur
- Academy
of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
- Pharmacology
Division, CSIR-Indian Institute of Integrative
Medicine, Jammu 180001, India
| | - Shikha Thakur
- Department
of Pharmacy, Birla Institute of Technology
and Sciences Pilani, Pilani 333031, Rajasthan, India
| | - Ajay Kumar
- Academy
of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
- Pharmacology
Division, CSIR-Indian Institute of Integrative
Medicine, Jammu 180001, India
| | - Hemant R. Jadhav
- Department
of Pharmacy, Birla Institute of Technology
and Sciences Pilani, Pilani 333031, Rajasthan, India
| | - Sandip B. Bharate
- Natural
Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
- Academy
of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
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Nuthakki VK, Choudhary S, Reddy CN, Bhatt S, Jamwal A, Jotshi A, Raghuvanshi R, Sharma A, Thakur S, Jadhav HR, Bharate SS, Nandi U, Kumar A, Bharate SB. Design, Synthesis, and Pharmacological Evaluation of Embelin-Aryl/alkyl Amine Hybrids as Orally Bioavailable Blood-Brain Barrier Permeable Multitargeted Agents with Therapeutic Potential in Alzheimer's Disease: Discovery of SB-1448. ACS Chem Neurosci 2023; 14:1193-1219. [PMID: 36812360 DOI: 10.1021/acschemneuro.3c00030] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023] Open
Abstract
The complex and multifaceted nature of Alzheimer's disease has brought about a pressing demand to develop ligands targeting multiple pathways to combat its outrageous prevalence. Embelin is a major secondary metabolite of Embelia ribes Burm f., one of the oldest herbs in Indian traditional medicine. It is a micromolar inhibitor of cholinesterases (ChEs) and β-site amyloid precursor protein cleaving enzyme 1 (BACE-1) with poor absorption, distribution, metabolism, and excretion (ADME) properties. Herein, we synthesize a series of embelin-aryl/alkyl amine hybrids to improve its physicochemical properties and therapeutic potency against targeted enzymes. The most active derivative, 9j (SB-1448), inhibits human acetylcholinesterase (hAChE), human butyrylcholinesterase (hBChE), and human BACE-1 (hBACE-1) with IC50 values of 0.15, 1.6, and 0.6 μM, respectively. It inhibits both ChEs noncompetitively with ki values of 0.21 and 1.3 μM, respectively. It is orally bioavailable, crosses blood-brain barrier (BBB), inhibits Aβ self-aggregation, possesses good ADME properties, and protects neuronal cells from scopolamine-induced cell death. The oral administration of 9j at 30 mg/kg attenuates the scopolamine-induced cognitive impairments in C57BL/6J mice.
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Affiliation(s)
- Vijay K Nuthakki
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Sushil Choudhary
- Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Jammu 180001, India.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Chilakala N Reddy
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Shipra Bhatt
- Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Jammu 180001, India.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Ashiya Jamwal
- Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Jammu 180001, India.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Anshika Jotshi
- Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Jammu 180001, India
| | - Rinky Raghuvanshi
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Ankita Sharma
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Shikha Thakur
- Department of Pharmacy, Birla Institute of Technology and Sciences Pilani, Pilani Campus, Vidya Vihar, Pilani 333031, Rajasthan, India
| | - Hemant R Jadhav
- Department of Pharmacy, Birla Institute of Technology and Sciences Pilani, Pilani Campus, Vidya Vihar, Pilani 333031, Rajasthan, India
| | - Sonali S Bharate
- Shobhaben Pratapbhai Patel School of Pharmacy & Technology Management, SVKM's NMIMS, V.L. Mehta Road, Vile Parle (W), Mumbai 400056, India
| | - Utpal Nandi
- Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Jammu 180001, India.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Ajay Kumar
- Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Jammu 180001, India.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Sandip B Bharate
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
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Sharma M, Sharma A, Nuthakki VK, Bhatt S, Nandi U, Bharate SB. Design, synthesis, and structure-activity relationship of caffeine-based triazoles as dual AChE and BACE-1 inhibitors. Drug Dev Res 2022; 83:1803-1821. [PMID: 36161804 DOI: 10.1002/ddr.21998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 08/27/2022] [Accepted: 09/04/2022] [Indexed: 11/07/2022]
Abstract
Natural products have significantly contributed to drug discovery for neurodegenerative diseases. Caffeine is one of the well-known central nervous system(CNS)-active natural products. Besides its CNS stimulant properties, it is a mild inhibitor of acetylcholinesterase (AChE) and possesses memory-enhancing properties. The present work aimed to improve the AChE inhibition activity of the caffeine. The rationally designed caffeine-based triazoles were synthesized and evaluated in vitro for cholinesterase and β-site amyloid precursor protein cleaving enzyme-1 (BACE-1) inhibitory activities. The attachment of triazole to the caffeine enhances its AChE inhibition activity from half-maximal inhibitory concentration (IC50 ) of 129 µM to 0.49 µM (derivative, 6l). The caffeine core interacts with the peripheral anionic site, whereas the benzyl triazole occupies the catalytic anionic site located at the bottom of the active site gorge. The structure-activity relationship revealed that the four-atom ester linker is superior to shorter linkers for connecting the caffeine core to the triazole. The 2,6-difluorobenzyl triazole-linked caffeine derivative, 6d, exhibits dual inhibition of AChE and BACE-1 with IC50 values of 1.43 and 10.9 µM, respectively. The derivative 6d inhibits AChE via a mixed-type mode with an inhibition rate constant (Ki ) value of 2.35 μM, which was corroborated by docking studies. The triazole 6d has an acceptable stability profile in human liver microsomes (t1/2 = 54 min) and was found to possess CNS permeability when evaluated using the parallel artificial membrane permeability blood-brain barrier assay. The results presented herein warrant investigating caffeine-based triazoles in preclinical models of Alzheimer's disease.
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Affiliation(s)
- Mohit Sharma
- Natural Products and Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Jammu, India.,Academy of Scientific and Innovative Research, Ghaziabad, India
| | - Ankita Sharma
- Natural Products and Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Jammu, India.,Academy of Scientific and Innovative Research, Ghaziabad, India
| | - Vijay K Nuthakki
- Natural Products and Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Jammu, India.,Academy of Scientific and Innovative Research, Ghaziabad, India
| | - Shipra Bhatt
- Academy of Scientific and Innovative Research, Ghaziabad, India.,PK-PD Toxicology Division, CSIR-Indian Institute of Integrative Medicine, Jammu, India
| | - Utpal Nandi
- Academy of Scientific and Innovative Research, Ghaziabad, India.,PK-PD Toxicology Division, CSIR-Indian Institute of Integrative Medicine, Jammu, India
| | - Sandip B Bharate
- Natural Products and Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Jammu, India.,Academy of Scientific and Innovative Research, Ghaziabad, India
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Banoo R, Nuthakki VK, Abdullaha M, Sharma M, Bharate SB. Blood–brain barrier permeable benzylpiperidin‐4‐yl‐linked benzylamino benzamides as dual cholinesterase inhibitors. Drug Dev Res 2022; 83:1791-1802. [DOI: 10.1002/ddr.21997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Revised: 08/12/2022] [Accepted: 08/26/2022] [Indexed: 11/11/2022]
Affiliation(s)
- Razia Banoo
- Natural Products and Medicinal Chemistry Division CSIR‐Indian Institute of Integrative Medicine Jammu India
- Academy of Scientific and Innovative Research Ghaziabad India
| | - Vijay K. Nuthakki
- Natural Products and Medicinal Chemistry Division CSIR‐Indian Institute of Integrative Medicine Jammu India
- Academy of Scientific and Innovative Research Ghaziabad India
| | - Mohd Abdullaha
- Natural Products and Medicinal Chemistry Division CSIR‐Indian Institute of Integrative Medicine Jammu India
- Academy of Scientific and Innovative Research Ghaziabad India
| | - Mohit Sharma
- Natural Products and Medicinal Chemistry Division CSIR‐Indian Institute of Integrative Medicine Jammu India
- Academy of Scientific and Innovative Research Ghaziabad India
| | - Sandip B. Bharate
- Natural Products and Medicinal Chemistry Division CSIR‐Indian Institute of Integrative Medicine Jammu India
- Academy of Scientific and Innovative Research Ghaziabad India
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Sharma A, Nuthakki VK, Gairola S, Singh B, Bharate SB. A Coumarin-donepezil Hybrid as a Blood-brain Barrier Permeable Dual Cholinesterase Inhibitor: Isolation, Synthetic Modifications and Biological Evaluation of Natural Coumarins. ChemMedChem 2022; 17:e202200300. [PMID: 35892288 DOI: 10.1002/cmdc.202200300] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Indexed: 11/08/2022]
Abstract
Plants have immensely contributed to the drug discovery for neurodegenerative diseases. Herein, we undertook the phytochemical investigation of Nardostachys jatamansi (D.Don) DC. rhizomes followed by semisynthetic modifications to discover cholinesterase (ChE) and beta-site amyloid precursor protein cleaving enzyme 1 (BACE-1) inhibitors. The 8-acetyl-7-hydroxycoumarin isolated from the bioactive extract moderately inhibits acetylcholinesterase (AChE) and BACE-1 with IC50 values of 22.1 and 17.7 μM, respectively. The semisynthetic trifluoromethyl substituted coumarin chalcone display a 5-fold improvement in BACE-1 inhibition (IC50 3.3 μM). Another semisynthetic derivative, a coumarin-donepezil hybrid, exhibits dual inhibition of both ChEs with IC50 values of 1.22 and 3.09 μM, respectively. Molecular modeling and enzyme kinetics revealed that the coumarin-donepezil hybrid is a non-competitive inhibitor of AChE. It crosses the blood-brain barrier and also inhibits Aβ self-aggregation. The results presented herein warrant a detailed investigation of the coumarin-donepezil hybrid in preclinical models of Alzheimer's disease.
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Affiliation(s)
- Ankita Sharma
- CSIR-Indian Institute of Integrative Medicine: Council of Scientific & Industrial Research Indian Institute of Integrative Medicine, Natural Products & Medicinal Chemistry Division, Canal Road, 180001, Jammu, INDIA
| | - Vijay K Nuthakki
- CSIR-Indian Institute of Integrative Medicine: Council of Scientific & Industrial Research Indian Institute of Integrative Medicine, Natural Products & Medicinal Chemistry Division, Canal Road, 180001, Jammu, INDIA
| | - Sumeet Gairola
- CSIR-Indian Institute of Integrative Medicine: Council of Scientific & Industrial Research Indian Institute of Integrative Medicine, Plant Sciences & Agrotechnology Division, Canal Road, 180001, Jammu, INDIA
| | - Bikarma Singh
- CSIR-National Botanical Research Institute, Botanical Garden Division, Canal Road, Lucknow, INDIA
| | - Sandip Bibishan Bharate
- Indian Institute of Integrative Medicine CSIR, Natural Products & Medicinal Chemistry, Canal Road, 180001, Jammu, INDIA
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Nuthakki VK, Mudududdla R, Bharate SB. Role of basic aminoalkyl chains in the lead optimization of Indoloquinoline alkaloids. Eur J Med Chem 2021; 227:113938. [PMID: 34710743 DOI: 10.1016/j.ejmech.2021.113938] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 10/12/2021] [Accepted: 10/19/2021] [Indexed: 11/19/2022]
Abstract
Indoloquinoline (IQ) is an important class of naturally occurring antimalarial alkaloids, mainly represented by cryptolepine, isocryptolepine, and neocryptolepine. The IQ structural framework consists of four isomeric ring systems differing via the linkage of indole with quinoline as [3,2-b], [3,2-c], [2,3-c], and [2,3-b]. Structurally, IQs are planar and thus they bind strongly to the DNA which largely contributes to their biological properties. The structural rigidity and associated nonspecific cellular toxicity is a key shortcoming of the IQ structural framework for preclinical development. Thus, the lead optimization efforts were aimed at improving the therapeutic window and ADME properties of IQs. The structural modifications mainly involved attaching the basic aminoalkyl chains that positively modulates the vital physicochemical and topological parameters, thereby improves biological activity. Our analysis has found that the aminoalkylation consistently improved the selectivity index and provided acceptable in-vivo antimalarial/anticancer activity. Herein, we critically review the role of aminoalkylation in deciphering the antimalarial and cytotoxic activity of IQs.
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Affiliation(s)
- Vijay K Nuthakki
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu, 180001, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Ramesh Mudududdla
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu, 180001, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Sandip B Bharate
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu, 180001, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, 201002, India.
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9
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Raghuvanshi R, Nuthakki VK, Singh L, Singh B, Bharate SS, Bhatti R, Bharate SB. Identification of plant-based multitargeted leads for Alzheimer's disease: In-vitro and in-vivo validation of Woodfordia fruticosa (L.) Kurz. Phytomedicine 2021; 91:153659. [PMID: 34332286 DOI: 10.1016/j.phymed.2021.153659] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 07/01/2021] [Accepted: 07/12/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Alzheimer's disease (AD) is a complex neurodegenerative disease with no availability of disease-modifying therapeutics. The complex etiology and recent failures in clinical trials indicate the need for multitargeted agents. PURPOSE The present study aims to discover new plant-based multitargeted anti-AD leads. METHODS A library of plant extracts was screened for inhibition of acetylcholinesterase (AChE), butyrylcholinesterase (BChE), and beta-site amyloid precursor protein cleaving enzyme 1 (BACE-1). The secondary metabolites of active extracts were also tested, followed by enzyme-kinetics and molecular modeling to understand the mechanism of inhibition. The most active extract was investigated for in-vivo anti-dementia activity in behavioral mice models. RESULTS Among the library of 105 extracts, Woodfordia fruticosa (SBE-80) and Bergenia ciliata (SBE-65) extracts displayed significant inhibition of all three enzymes. Gallic acid, one of the constituents of both plants, shows moderate inhibition of AChE and BACE-1. Catechin-3-O-gallate (CG), another constituent of SBE-65, inhibits EeAChE, rHuAChE, and eqBChE with IC50's of 29.9, 1.77, and 8.4 µM, respectively; along with a mild-inhibition of BACE-1. Ellagic acid, the constituent of SBE-80, inhibits BACE-1 with an IC50 value of 16 µM. The W. fruticosa extract SBE-80 at the dose of 25 mg/kg QD × 9 (PO) displayed memory-enhancing activity in Morris Water Maze and Passive Avoidance Test in Swiss albino mice. Treatment with SBE-80 also inhibits AChE in-vivo; whereas, a non-significant decrease in the serum TBARS was observed. CONCLUSION W. fruticosa is identified for the first time as an anti-AD lead candidate. The in-vitro and in-vivo data presented herein and the documented safety profile of W. fruticosa indicate its strong potential for preclinical development as a botanical drug for dementia/AD.
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Affiliation(s)
- Rinky Raghuvanshi
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Vijay K Nuthakki
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India
| | - Lovedeep Singh
- Department of Pharmaceutical Sciences, Guru Nanak Dev University, Amritsar-143005, Punjab, India
| | - Bikarma Singh
- Academy of Scientific & Innovative Research (AcSIR), Ghaziabad-201002, India; Biodiversity and Applied Botany Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India; Botanical Garden Division, CSIR- National Botanical Research Institute, Lucknow-226001, UP, India
| | - Sonali S Bharate
- PK-PD Toxicology & Formulation Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India; Shobhaben Pratapbhai Patel School of Pharmacy & Technology Management, SVKM's NMIMS, V.L. Mehta Road, Vile Parle (W), Mumbai-400056, India
| | - Rajbir Bhatti
- Department of Pharmaceutical Sciences, Guru Nanak Dev University, Amritsar-143005, Punjab, India
| | - Sandip B Bharate
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad-201002, India.
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Nuthakki VK, Yadav Bheemanaboina RR, Bharate SB. Identification of aplysinopsin as a blood-brain barrier permeable scaffold for anti-cholinesterase and anti-BACE-1 activity. Bioorg Chem 2020; 107:104568. [PMID: 33418314 DOI: 10.1016/j.bioorg.2020.104568] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2020] [Revised: 12/15/2020] [Accepted: 12/16/2020] [Indexed: 11/17/2022]
Abstract
Aplysinopsins are a group of marine-derived indole alkaloids that display diverse array of pharmacological effects. However, their effect on anti-Alzheimer targets has not been reported. Herein, we report the synthesis of aplysinopsin (1) and its effect on cholinesterases and beta-site amyloid-precursor protein cleaving enzyme 1 (BACE-1). It inhibits electric eel acetylcholinesterase (AChE), equine serum butyrylcholinesterase (BChE), and human BACE-1 with IC50 values of 33.9, 30.3, and 33.7 µM, respectively, and excellent BBB permeability (Pe 8.92 × 10-6 cm/s). To optimize its sub-micromolar activity, the first-generation analogs were prepared and screened. Two most active analogs 5b and (Z)-8g were found to effectively permeate the BBB (Pe > 5 × 10-6 cm/s). The N-sulphonamide derivative 5b display better cholinesterase inhibition, whereas the other analog (Z)-8g strongly inhibits BACE-1 (IC50 0.78 µM) activity. The analog 5b interacts primarily with PAS of AChE, and thus exhibit a mixed-type of inhibition. In addition, aplysinopsin along with new analogs inhibited the self-induced Aβ1-42 aggregation. The data presented herein indicate that the aplysinopsin-scaffold holds a potential for further investigation as a multi-targeted anti-Alzheimer agent.
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Affiliation(s)
- Vijay K Nuthakki
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India; Academy of Scientific & Innovative Research, Ghaziabad 201002, India
| | - Rammohan R Yadav Bheemanaboina
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India; Academy of Scientific & Innovative Research, Ghaziabad 201002, India
| | - Sandip B Bharate
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India; Academy of Scientific & Innovative Research, Ghaziabad 201002, India.
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11
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Mahajan S, Slathia N, Nuthakki VK, Bharate SB, Kapoor KK. Malononitrile-activated synthesis and anti-cholinesterase activity of styrylquinoxalin-2(1 H)-ones. RSC Adv 2020; 10:15966-15975. [PMID: 35493659 PMCID: PMC9052867 DOI: 10.1039/d0ra02816a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 04/16/2020] [Indexed: 12/12/2022] Open
Abstract
Herein, we report a base-free malononitrile activated condensation of 3-methylquinoxaline-2(1H)-one (3MQ) 1 with aryl aldehydes 3a–3ad for synthesis of styrylquinoxalin-2(1H)-ones (SQs) 4a–4ad with excellent yields. In this reaction, malononitrile activates the aldehyde via Knoevenagel condensation towards reaction with 3MQ 1 and gets liberated during the course of reaction to yield the desired SQs 4a–4ad. The SQs were evaluated for in vitro cholinesterase inhibition and 4n was found to display a mixed type of inhibition of AChE, which was supported by molecular modelling studies. This study has led to the discovery of a new chemotype for cholinesterase inhibition which might be useful in finding a remedy for Alzheimer's disease. SQs displaying anti-Alzheimer activity is serendipitous. Malononitrile as a handle to facilitate nucleophilic attack has been applied for the first time for the easy access of SQs.![]()
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Affiliation(s)
- Sheena Mahajan
- Department of Chemistry, University of Jammu Jammu-180006 India
| | - Nancy Slathia
- Department of Chemistry, University of Jammu Jammu-180006 India
| | - Vijay K Nuthakki
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine Canal Road Jammu-180001 India.,Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 India
| | - Sandip B Bharate
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine Canal Road Jammu-180001 India.,Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 India
| | - Kamal K Kapoor
- Department of Chemistry, University of Jammu Jammu-180006 India
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12
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Augustin N, Nuthakki VK, Abdullaha M, Hassan QP, Gandhi SG, Bharate SB. Discovery of Helminthosporin, an Anthraquinone Isolated from Rumex abyssinicus Jacq as a Dual Cholinesterase Inhibitor. ACS Omega 2020; 5:1616-1624. [PMID: 32010836 PMCID: PMC6990627 DOI: 10.1021/acsomega.9b03693] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 12/31/2019] [Indexed: 05/08/2023]
Abstract
Natural products have extensively contributed toward the discovery of new leads for Alzheimer's disease. During our search for new inhibitors of cholinesterase enzymes from natural sources, the ethyl acetate (EtOAc) extract of Rumex abyssinicus Jacq was identified as a dual cholinesterase inhibitor with IC50 values of 2.7 and 11.4 μg/mL against acetylcholinesterase (AChE) and butyrylcholinesterase (BChE), respectively. The phytochemical investigation of the EtOAc extract has resulted in isolation of four anthraquinones, namely, helminthosporin, emodin, chrysophanol, and physcion, amongst which the helminthosporin has been isolated for the first time from Rumex sp. All isolated secondary metabolites have displayed significant inhibition of EeAChE with IC50 values of 2.63, 15.21, 33.7, and 12.16 μM, respectively. In addition, the helminthosporin was also found to inhibit BChE with an IC50 value of 2.99 μM. The enzyme kinetic study has indicated that helminthosporin inhibits AChE and BChE in a noncompetitive manner with k i values of 10.3 and 12.3 μM, respectively. The results of molecular modeling and propidium iodide displacement assay have revealed that helminthosporin occupies the peripheral anionic site of the active site gorge of AChE. In the PAMPA-BBB permeability assay, helminthosporin was found to possess high BBB permeability (P e = 6.16 × 10-6 cm/s). In a nutshell, helminthosporin has been identified as a brain permeable dual cholinesterase inhibitor, and thus its further synthetic exploration is warranted for optimization of its potency.
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Affiliation(s)
- Ntemafack Augustin
- Plant
Biotechnology Division and Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
- Academy
of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Vijay K. Nuthakki
- Plant
Biotechnology Division and Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
- Academy
of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Mohd. Abdullaha
- Plant
Biotechnology Division and Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
- Academy
of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Qazi Parvaiz Hassan
- Academy
of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
- Plant
Biotechnology Division, CSIR-Indian Institute
of Integrative Medicine, Sanat Nagar, Srinagar 190005, India
| | - Sumit G. Gandhi
- Plant
Biotechnology Division and Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
- Academy
of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Sandip B. Bharate
- Plant
Biotechnology Division and Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
- Academy
of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
- E-mail: , . Phone: +91-191-2586333, +91-191-2585006 ext.
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13
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Nuthakki VK, Sharma A, Kumar A, Bharate SB. Identification of embelin, a 3-undecyl-1,4-benzoquinone from Embelia ribes as a multitargeted anti-Alzheimer agent. Drug Dev Res 2019; 80:655-665. [PMID: 31050027 DOI: 10.1002/ddr.21544] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 04/15/2019] [Accepted: 04/23/2019] [Indexed: 12/30/2022]
Abstract
Beta-secreatse (BACE-1) and cholinesterases are clinically validated targets of Alzheimer's disease (AD), for which natural products have provided immense contribution. The multifaceted nature of AD signifies the need of multitargeted agents to tackle this disease. In the search of new natural products as dual BACE-1/cholinesterase inhibitors, a library of pure natural products was screened for inhibition of acetylcholinesterase (AChE), butyrylcholinesterase (BChE), and BACE-1. The screening efforts have identified 1,4-benzoquinone "embelin," a natural product derived from Embelia ribes displaying inhibition of all three enzymes, with IC50 values of 2.5, 5.4, and 2.1 μM, respectively. This screen has also identified isoquinoline alkaloids papaverine and L-tetrahydropalmatine as AChE inhibitors. Kinetic study has shown that embelin inhibits EeAChE and EqBChE with ki values of 4.59 and 0.57 μM, in an uncompetitive and noncompetitive manner, respectively. The interactions of embelin with allosteric peripheral anionic site of cholinesterases, has further supported the results of kinetic study. Embelin has also enhanced the activity of P-gp in LS-180 cells, the efflux pump which is involved in the clearance of amyloid-β from AD brain. Further, the cell viability study in neuronal cell line has indicated the excellent therapeutic window of embelin. These results are indicative of the fact that embelin is a multitargeted agent playing role in stopping the formation of amyloid-β oligomers (via inhibition of BACE-1), improves cholinergic-transmission (via inhibition of AChE/BChE) and increases amyloid-β clearance (via P-gp induction).
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Affiliation(s)
- Vijay K Nuthakki
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Jammu, India
| | - Ankita Sharma
- PK-PD Toxicology & Formulation Division, CSIR-Indian Institute of Integrative Medicine, Jammu, India
| | - Ajay Kumar
- PK-PD Toxicology & Formulation Division, CSIR-Indian Institute of Integrative Medicine, Jammu, India
| | - Sandip B Bharate
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Jammu, India
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14
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Bharate SB, Kumar V, Jain SK, Mintoo MJ, Guru SK, Nuthakki VK, Sharma M, Bharate SS, Gandhi SG, Mondhe DM, Bhushan S, Vishwakarma RA. Discovery and Preclinical Development of IIIM-290, an Orally Active Potent Cyclin-Dependent Kinase Inhibitor. J Med Chem 2018; 61:1664-1687. [PMID: 29370702 DOI: 10.1021/acs.jmedchem.7b01765] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Rohitukine (1), a chromone alkaloid isolated from Indian medicinal plant Dysoxylum binectariferum, has inspired the discovery of flavopiridol and riviciclib, both of which are bioavailable only via intravenous route. With the objective to address the oral bioavailability issue of this scaffold, four series of rohitukine derivatives were prepared and screened for Cdk inhibition and cellular antiproliferative activity. The 2,6-dichloro-styryl derivative IIIM-290 (11d) showed strong inhibition of Cdk-9/T1 (IC50 1.9 nM) kinase and Molt-4/MIAPaCa-2 cell growth (GI50 < 1.0 μM) and was found to be highly selective for cancer cells over normal fibroblast cells. It inhibited the cell growth of MIAPaCa-2 cells via caspase-dependent apoptosis. It achieved 71% oral bioavailability with in vivo efficacy in pancreatic, colon, and leukemia xenografts at 50 mg/kg, po. It did not have CYP/efflux-pump liability, was not mutagenic/genotoxic or cardiotoxic, and was metabolically stable. The preclinical data presented herein indicates the potential of 11d for advancement in clinical studies.
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Affiliation(s)
- Sandip B Bharate
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India.,Academy of Scientific & Innovative Research, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Vikas Kumar
- Academy of Scientific & Innovative Research, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India.,Preformulation Laboratory, PK-PD Toxicology & Formulation Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Shreyans K Jain
- Natural Products Chemistry Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Mubashir J Mintoo
- Academy of Scientific & Innovative Research, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India.,Cancer Pharmacology Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Santosh K Guru
- Cancer Pharmacology Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Vijay K Nuthakki
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Mohit Sharma
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Sonali S Bharate
- Preformulation Laboratory, PK-PD Toxicology & Formulation Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Sumit G Gandhi
- Academy of Scientific & Innovative Research, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India.,Plant Biotechnology Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Dilip M Mondhe
- Academy of Scientific & Innovative Research, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India.,Cancer Pharmacology Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Shashi Bhushan
- Cancer Pharmacology Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India.,Indian Pharmacopeia Commission , Sec-23, Raj Nagar, Ghaziabad-201002, India
| | - Ram A Vishwakarma
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India.,Academy of Scientific & Innovative Research, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
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15
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Williams IS, Chib S, Nuthakki VK, Gatchie L, Joshi P, Narkhede NA, Vishwakarma RA, Bharate SB, Saran S, Chaudhuri B. Biotransformation of Chrysin to Baicalein: Selective C6-Hydroxylation of 5,7-Dihydroxyflavone Using Whole Yeast Cells Stably Expressing Human CYP1A1 Enzyme. J Agric Food Chem 2017; 65:7440-7446. [PMID: 28782952 DOI: 10.1021/acs.jafc.7b02690] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Naturally occurring polyphenolic compounds are of medicinal importance because of their unique antioxidant, anticancer, and chemopreventive properties. Baicalein, a naturally occurring polyhydroxy flavonoid possessing a diverse range of pharmacological activities, has been used in traditional medicines for treatment of various ailments. Apart from its isolation from natural sources, its synthesis has been reported via multistep chemical approaches. Here, we report a preparative-scale biotransformation, using whole yeast cells stably expressing human cytochrome P450 1A1 (CYP1A1) enzyme that allows regioselective C6-hydroxylation of 5,7-dihydroxyflavone (chrysin) to form 5,6,7-trihydroxyflavone (baicalein). Molecular modeling reveals why chrysin undergoes such specific hydroxylation mediated by CYP1A1. More than 92% reaction completion was obtained using a shake-flask based process that mimics fed-batch fermentation. Such highly efficient selective hydroxylation, using recombinant yeast cells, has not been reported earlier. Similar CYP-expressing yeast cell based systems are likely to have wider applications in the syntheses of medicinally important polyphenolic compounds.
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Affiliation(s)
- Ibidapo S Williams
- Leicester School of Pharmacy, De Montfort University , Leicester, LE1 9BH, United Kingdom
- CYP Design Limited, Innovation Centre , 49 Oxford Street, Leicester, LE1 5XY, United Kingdom
| | - Shifali Chib
- Fermentation Technology Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Vijay K Nuthakki
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Linda Gatchie
- Leicester School of Pharmacy, De Montfort University , Leicester, LE1 9BH, United Kingdom
- CYP Design Limited, Innovation Centre , 49 Oxford Street, Leicester, LE1 5XY, United Kingdom
| | - Prashant Joshi
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Niteen A Narkhede
- Instrumentation Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Ram A Vishwakarma
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Sandip B Bharate
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
- Academy of Scientific & Innovative Research (AcSIR), CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Saurabh Saran
- Fermentation Technology Division, CSIR-Indian Institute of Integrative Medicine , Canal Road, Jammu-180001, India
| | - Bhabatosh Chaudhuri
- Leicester School of Pharmacy, De Montfort University , Leicester, LE1 9BH, United Kingdom
- CYP Design Limited, Innovation Centre , 49 Oxford Street, Leicester, LE1 5XY, United Kingdom
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Fleser PS, Nuthakki VK, Malinzak LE, Callahan RE, Seymour ML, Reynolds MM, Merz SI, Meyerhoff ME, Bendick PJ, Zelenock GB, Shanley CJ. Nitric oxide–releasing biopolymers inhibit thrombus formation in a sheep model of arteriovenous bridge grafts. J Vasc Surg 2004; 40:803-11. [PMID: 15472611 DOI: 10.1016/j.jvs.2004.07.007] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
OBJECTIVES Nitric oxide (NO), produced by normal vascular endothelial cells, reduces platelet aggregation and thrombus formation. NO-releasing biopolymers have the potential to prolong vascular graft and stent patency without adverse systemic vasodilation. METHODS 5-mm polyurethane vascular grafts coated with a polymer containing the NO-donor dialkylhexanediamine diazeniumdiolate were implanted for 21 days in a sheep arteriovenous bridge-graft model. RESULTS Eighty percent (4/5) of grafts coated with the NO-releasing polymer remained patent through the 21 day implantation period, compared to fifty percent (2/4) of sham-coated grafts and no (0/3) uncoated grafts. Thrombus-free surface area (+/-SEM) of explanted grafts was significantly increased in NO-donor coated grafts (98.2% +/- 0.9%) compared with sham-coated (79.2% +/- 8.6%) and uncoated (47.2% +/- 5.4%) grafts ( P = .00046). Examination of the graft surface showed no adherent thrombus or platelets and no inflammatory cell infiltration in NO-donor coated grafts, while control grafts showed adherent complex surface thrombus consisting of red blood cells in an amorphous fibrin matrix, as well as significant red blood cell and inflammatory cell infiltration into the graft wall. CONCLUSION In this study we determined that local NO release from the luminal surface of prosthetic vascular grafts can reduce thrombus formation and prolong patency in a model of prosthetic arteriovenous bridge grafts in adult sheep. These findings may translate into improved function and improved primary patency rates in small-diameter prosthetic vascular grafts.
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Affiliation(s)
- Paul S Fleser
- William Beaumont Hospital, Department of Surgery and Research Institute, Royal Oak, MI 48073, USA
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Nuthakki VK, Fleser PS, Malinzak LE, Seymour ML, Callahan RE, Bendick PJ, Zelenock GB, Shanley CJ. Lysyl oxidase expression in a rat model of arterial balloon injury. J Vasc Surg 2004; 40:123-9. [PMID: 15218472 DOI: 10.1016/j.jvs.2004.02.028] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVE Traditional therapies for arteriosclerotic disease often fail as a result of an exaggerated fibroproliferative response (recurrent stenosis) at the site of the intervention. Lysyl oxidase, secreted by activated vascular smooth muscle cells and fibroblasts, catalyzes a key step in the cross-linking and stabilization of collagen and elastin in the vascular wall. We hypothesized that lysyl oxidase messenger RNA (mRNA) and protein expression are time-dependent and precede collagen accumulation and luminal narrowing after arterial balloon injury in the rat. METHODS A 2F balloon-tipped catheter was used to injure the right common carotid artery in male Sprague-Dawley rats. Injured right and control (uninjured) left common carotid arteries were harvested at 0, 0.25, 1, 3, 7, 14, 21, 28, and 60 days for mRNA quantitation and immunohistochemical analysis. Steady-state lysyl oxidase mRNA levels were quantitated with real-time reverse transcription polymerase chain reaction (TaqMan). Immunohistochemical staining with antibodies to alpha-smooth muscle cell actin and lysyl oxidase, and Movat pentachrome staining were performed for qualitative assessment of changes in the cellular and extracellular matrix components of the vessel wall. Post-injury intimal area was measured from hematoxylin and eosin-stained specimens at each time point. RESULTS When compared with sham-operated control arteries, lysyl oxidase expression in balloon-injured arteries increased significantly to 212% by day 3 after injury, and remained elevated through day 21, with a decrease toward baseline levels by day 28. Lysyl oxidase protein expression did not peak until day 14, and persisted through day 28. Collagen accumulation peaked at day 28, corresponding to the maximal increase in intimal area, with later accumulation of proteoglycans and ground substance in the intimal lesion. CONCLUSION Our results indicate that lysyl oxidase mRNA and protein expression is time-dependent after balloon injury of the rat carotid artery and that expression appears to precede maximal collagen accumulation and corresponding increases in intimal area. This suggests that lysyl oxidase may have an important role in stabilization of collagen and elastin at sites of vascular injury and that modulation of lysyl oxidase activity may be a viable method to prevent or reduce recurrent stenosis. CLINICAL RELEVANCE Failure of traditional therapies for ischemic arteriosclerotic disease is often due to an exaggerated fibroproliferative response (recurrent stenosis) at the site of intervention. Recurrent stenosis can be viewed as an injury-repair process, with an initial stage characterized by cellular proliferation followed by deposition of extracellular matrix. This study focuses on lysyl oxidase, a key enzyme involved in stabilization of collagen and elastin. This study demonstrates that lysyl oxidase messenger RNA and protein expression are time-dependent, preceding collagen accumulation and corresponding increases in intimal area. Accumulation of extracellular matrix is a major factor in growth of the restenotic lesion, and modulation of lysyl oxidase activity may offer a therapeutic method for decreasing or preventing recurrent stenosis.
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Affiliation(s)
- Vijay K Nuthakki
- Department of Surgery and Research Institute, William Beaumont Hospital, Royal Oak, MI, USA
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Batchelor MM, Reoma SL, Fleser PS, Nuthakki VK, Callahan RE, Shanley CJ, Politis JK, Elmore J, Merz SI, Meyerhoff ME. More lipophilic dialkyldiamine-based diazeniumdiolates: synthesis, characterization, and application in preparing thromboresistant nitric oxide release polymeric coatings. J Med Chem 2004; 46:5153-61. [PMID: 14613318 DOI: 10.1021/jm030286t] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The synthesis, characterization, and biomedical application in preparing more thromboresistant polymeric coatings for a series of lipophilic dialkyldiamine-based diazeniumdiolatesare described. Dialkylhexamethylenediamine diazeniumdiolates of the form RN[N(O)NO](-)(CH(2))(6)NH(2)(+)R, where R = CH(3), CH(2)CH(3), (CH(2))(2)CH(3), (CH(2))(3)CH(3), (CH(2))(4)CH(3,) (CH(2))(5)CH(3), and (CH(2))(11)CH(3), are prepared via reaction of the corresponding diamine with NO. The more lipophilic diazeniumdiolates [e.g., R = (CH(2))(3)CH(3)] can be incorporated into hydrophobic polymeric films (e.g., plasticized PVC), and the resulting materials release NO for extended periods of time upon exposure to PBS buffer. The mechanism of NO release from these films is examined in detail. More stable initial NO release can be achieved by adding lipophilic anionic species (e.g., tetraphenylborate derivative) to the polymeric material to buffer the activity of protons within the organic phase. It is shown that the use of these new lipophilic NO-donors in polymers provides the ability to tailor NO release rates for a variety of medical applications. As an example, polymers doped with N,N'-dibutylhexamethylenediamine diazeniumdiolate and a tetraphenylborate derivative are employed as coatings for vascular grafts in sheep. The NO release grafts exhibited enhanced performance and had an average 95% thrombus-free surface area compared to 42% for the corresponding control grafts when examined after 21d of implantation.
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Affiliation(s)
- Melissa M Batchelor
- Department of Chemistry, The University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, USA
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