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Abstract
Quadruplex‐duplex (Q‐D) junctions are increasingly considered promising targets for medicinal and technological applications. Here, a Q‐D hybrid with a hairpin‐type snapback loop coaxially stacked onto the quadruplex 3’‐outer tetrad was designed and employed as a target structure for the indoloquinoline ligand SYUIQ‐5. NMR spectral analysis demonstrated high‐affinity binding of the ligand at the quadruplex‐duplex interface with association constants determined by isothermal titration calorimetry of about 107 M−1 and large exothermicities ΔH° of −14 kcal/mol in a 120 mM K+ buffer at 40 °C. Determination of the ligand‐bound hybrid structure revealed intercalation of SYUIQ‐5 between 3’‐outer tetrad and the neighboring CG base pair, maximizing π–π stacking as well as electrostatic interactions with guanine carbonyl groups in close vicinity to the positively charged protonated quinoline nitrogen of the tetracyclic indoloquinoline. Exhibiting considerable flexibility, the SYUIQ‐5 sidechain resides in the duplex minor groove. Based on comparative binding studies with the non‐substituted N5‐methylated indoloquinoline cryptolepine, the sidechain is suggested to confer additional affinity and to fix the alignment of the intercalated indoloquinoline aromatic core. However, selectivity for the Q‐D junction mostly relies on the geometry and charge distribution of the indoloquinoline ring system. The presented results are expected to provide valuable guidelines for the design of ligands specifically targeting Q‐D interfaces.
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Affiliation(s)
- Yoanes Maria Vianney
- Universität Greifswald Mathematisch-Naturwissenschaftliche Fakultät: Universitat Greifswald Mathematisch-Naturwissenschaftliche Fakultat, Institut für Biochemie, Felix-Hausdorff-Str. 4, 17489, Greifswald, GERMANY
| | - Klaus Weisz
- Universität Greifswald, Institut für Biochemie, Felix-Hausdorff-Str. 4, 17487, Greifswald, GERMANY
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Johnston CA, Cordes DB, Lebl T, Slawin AMZ, Westwood NJ. Synthesis of Indoloquinolines: An Intramolecular Cyclization Leading to Advanced Perophoramidine-Relevant Intermediates. Molecules 2021; 26:6039. [PMID: 34641583 DOI: 10.3390/molecules26196039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 09/30/2021] [Accepted: 10/01/2021] [Indexed: 12/03/2022] Open
Abstract
The bioactive natural product perophoramidine has proved a challenging synthetic target. An alternative route to its indolo[2,3-b]quinolone core structure involving a N-chlorosuccinimde-mediated intramolecular cyclization reaction is reported. Attempts to progress towards the natural product are also discussed with an unexpected deep-seated rearrangement of the core structure occurring during an attempted iodoetherification reaction. X-ray crystallographic analysis provides important analytical confirmation of assigned structures.
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Charpentier E, Doudet L, Allart-Simon I, Colin M, Gangloff SC, Gérard S, Reffuveille F. Synergy between Indoloquinolines and Ciprofloxacin: An Antibiofilm Strategy against Pseudomonas aeruginosa. Antibiotics (Basel) 2021; 10:antibiotics10101205. [PMID: 34680786 PMCID: PMC8532862 DOI: 10.3390/antibiotics10101205] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 09/28/2021] [Accepted: 10/01/2021] [Indexed: 01/01/2023] Open
Abstract
Antibiotic treatments can participate in the formation of bacterial biofilm in case of under dosage. The interest of indoloquinoline scaffold for drug discovery incited us to study the preparation of new indolo [2,3-b]quinoline derivatives by a domino radical process. We tested the effect of two different “indoloquinoline” molecules (Indol-1 and Indol-2) without antimicrobial activity, in addition to ciprofloxacin, on biofilm formation thanks to crystal violet staining and enumeration of adhered bacteria. This association of ciprofloxacin and Indol-1 or Indol-2 attenuated the formation of biofilm up to almost 80% compared to ciprofloxacin alone, or even prevented the presence of adhered bacteria. In conclusion, these data prove that the association of non-antimicrobial molecules with an antibiotic can be a solution to fight against biofilm and antibiotic resistance emergence.
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Affiliation(s)
- Emilie Charpentier
- EA 4691 Biomatériaux et Inflammation en Site Osseux (BIOS), UFR Pharmacie, Université de Reims Champagne-Ardenne, SFR Cap Santé (FED 4231), 51097 Reims, France; (E.C.); (M.C.); (S.C.G.)
| | - Ludovic Doudet
- Institut de Chimie Moléculaire de Reims (ICMR-UMR CNRS 7312), UFR Pharmacie, Université de Reims Champagne-Ardenne, 51097 Reims, France; (L.D.); (I.A.-S.); (S.G.)
| | - Ingrid Allart-Simon
- Institut de Chimie Moléculaire de Reims (ICMR-UMR CNRS 7312), UFR Pharmacie, Université de Reims Champagne-Ardenne, 51097 Reims, France; (L.D.); (I.A.-S.); (S.G.)
| | - Marius Colin
- EA 4691 Biomatériaux et Inflammation en Site Osseux (BIOS), UFR Pharmacie, Université de Reims Champagne-Ardenne, SFR Cap Santé (FED 4231), 51097 Reims, France; (E.C.); (M.C.); (S.C.G.)
| | - Sophie C. Gangloff
- EA 4691 Biomatériaux et Inflammation en Site Osseux (BIOS), UFR Pharmacie, Université de Reims Champagne-Ardenne, SFR Cap Santé (FED 4231), 51097 Reims, France; (E.C.); (M.C.); (S.C.G.)
| | - Stéphane Gérard
- Institut de Chimie Moléculaire de Reims (ICMR-UMR CNRS 7312), UFR Pharmacie, Université de Reims Champagne-Ardenne, 51097 Reims, France; (L.D.); (I.A.-S.); (S.G.)
| | - Fany Reffuveille
- EA 4691 Biomatériaux et Inflammation en Site Osseux (BIOS), UFR Pharmacie, Université de Reims Champagne-Ardenne, SFR Cap Santé (FED 4231), 51097 Reims, France; (E.C.); (M.C.); (S.C.G.)
- Correspondence:
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Håheim KS, Lindbäck E, Tan KN, Albrigtsen M, Urdal Helgeland IT, Lauga C, Matringe T, Kennedy EK, Andersen JH, Avery VM, Sydnes MO. Synthesis and Evaluation of the Tetracyclic Ring-System of Isocryptolepine and Regioiso-Mers for Antimalarial, Antiproliferative and Antimicrobial Activities. Molecules 2021; 26:3268. [PMID: 34070798 DOI: 10.3390/molecules26113268] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 05/18/2021] [Accepted: 05/26/2021] [Indexed: 12/04/2022] Open
Abstract
A series of novel quinoline-based tetracyclic ring-systems were synthesized and evaluated in vitro for their antiplasmodial, antiproliferative and antimicrobial activities. The novel hydroiodide salts 10 and 21 showed the most promising antiplasmodial inhibition, with compound 10 displaying higher selectivity than the employed standards. The antiproliferative assay revealed novel pyridophenanthridine 4b to be significantly more active against human prostate cancer (IC50 = 24 nM) than Puromycin (IC50 = 270 nM) and Doxorubicin (IC50 = 830 nM), which are used for clinical treatment. Pyridocarbazoles 9 was also moderately effective against all the employed cancer cell lines and moreover showed excellent biofilm inhibition (9a: MBIC = 100 µM; 9b: MBIC = 100 µM).
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Altwaijry N, El-Ghlban S, El Sayed IET, El-Bahnsawye M, Bayomi AI, Samaka RM, Shaban E, Elmongy EI, El-Masry TA, Ahmed HMA, Attallah NGM. In Vitro and In Vivo Antitumor Activity of Indolo[2,3- b] Quinolines, Natural Product Analogs from Neocryptolepine Alkaloid. Molecules 2021; 26:754. [PMID: 33535575 PMCID: PMC7867085 DOI: 10.3390/molecules26030754] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 01/24/2021] [Accepted: 01/26/2021] [Indexed: 11/27/2022] Open
Abstract
Neocryptolepine (5-methyl-5H-indolo[2,3-b] quinoline) analogs were synthesized and evaluated in vitro and in vivo for their effect versus Ehrlich ascites carcinoma (EAC). The analogs showed stronger cytotoxic activity against EAC cells than the reference drug. The in vivo evaluation of the target compounds against EAC-induced solid tumor in the female albino Swiss mice revealed a remarkable decrease in the tumor volume (TV) and hepatic lipid peroxidation. A noticeable increase of both superoxide dismutase (SOD) and catalase (CAT) levels was reported (p < 0.001), which set-forth proof of their antioxidant effect. In addition, the in vitro antioxidant activity of the neocryptolepine analogs was screened out using the DPPH method and showed promising activities activity. The histopathological investigations affirmed that the tested analogs have a remarkable curative effect on solid tumors with minimal side-effect on the liver. The study also includes illustrated mechanism of the antitumor activity at the cell level by flow cytometry. The cell cycle analysis showed that the neocryptolepine analogs extensively increase the aggregation of tumor cells in three phases of the cell cycle (G0/G1, S and G2/M) with the emergence of a hypo-diploid DNA content peak (sub-G1) in the cell cycle experiments, which is a clear-cut for the apoptotic cell population. Furthermore, the immunological study manifested a significant elevation in splenic lymphocyte count (p < 0.001) with the elevation of the responsiveness of lymphocytes to phytohemagglutinin (PHA). These results indicate that these naturally-based neocryptolepine alkaloids exhibit marked antitumor activity in vivo and represent an important lead in the development of natural-based anticancer drugs.
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Affiliation(s)
- Najla Altwaijry
- Department of Pharmaceutical Sciences, College of Pharmacy, Princess Nourah bint Abdulrahman University, Riyadh P.O. Box 84428, Saudi Arabia; (N.A.); (E.I.E.); (T.A.E.-M.); (N.G.M.A.)
| | - Samah El-Ghlban
- Department of Chemistry, Faculty of Science, Menoufia University, Shebin El Koom P.O. Box 32511, Egypt; (S.E.-G.); (M.E.-B.)
| | - Ibrahim E.-T. El Sayed
- Department of Chemistry, Faculty of Science, Menoufia University, Shebin El Koom P.O. Box 32511, Egypt; (S.E.-G.); (M.E.-B.)
| | - Mohamed El-Bahnsawye
- Department of Chemistry, Faculty of Science, Menoufia University, Shebin El Koom P.O. Box 32511, Egypt; (S.E.-G.); (M.E.-B.)
| | - Asmaa I. Bayomi
- Department of Zoology, Faculty of Science, Menoufia University, Shebin El Koom P.O. Box 32511, Egypt;
| | - Rehab M. Samaka
- Department of Pathology, Faculty of Medicine, Menoufia University, Shebin El Koom P.O. Box 32511, Egypt;
| | - Elkhabiry Shaban
- Dyeing, Printing and Textile Auxiliaries Department, Textile Research Division, National Research Centre, 33 El Bohouth St., Dokki, Giza P.O. Box 12622, Egypt;
| | - Elshaymaa I. Elmongy
- Department of Pharmaceutical Sciences, College of Pharmacy, Princess Nourah bint Abdulrahman University, Riyadh P.O. Box 84428, Saudi Arabia; (N.A.); (E.I.E.); (T.A.E.-M.); (N.G.M.A.)
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Helwan University, Ain Helwan, Cairo P.O. Box 11795, Egypt
| | - Thanaa A. El-Masry
- Department of Pharmaceutical Sciences, College of Pharmacy, Princess Nourah bint Abdulrahman University, Riyadh P.O. Box 84428, Saudi Arabia; (N.A.); (E.I.E.); (T.A.E.-M.); (N.G.M.A.)
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Tanta University, Tanta P.O. Box 31527, Egypt
| | - Hytham M. A. Ahmed
- Pharmaceutical Analysis Department, Faculty of Pharmacy, Menoufia University, Shebin El Koom P.O. Box 32511, Menoufia, Egypt;
| | - Nashwah G. M. Attallah
- Department of Pharmaceutical Sciences, College of Pharmacy, Princess Nourah bint Abdulrahman University, Riyadh P.O. Box 84428, Saudi Arabia; (N.A.); (E.I.E.); (T.A.E.-M.); (N.G.M.A.)
- National Organization of Drug Control and Research (NODCAR), Giza P.O. Box 29 Pyramids, Egypt
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