0000000000419110

AUTHOR

Mauro Freccero

0000-0002-7438-1526

showing 3 related works from this author

Synthesis and photocytotoxic activity of [1,2,3]triazolo[4,5-h][1,6]naphthyridines and [1,3]oxazolo[5,4-h][1,6]naphthyridines

2018

Abstract [1,2,3]Triazolo[4,5-h][1,6]naphthyridines and [1,3]oxazolo[5,4-h][1,6]naphthyridines were synthesized with the aim to investigate their photocytotoxic activity. Upon irradiation, oxazolo-naphtapyridines induced light-dependent cell death at nanomolar/low micromolar concentrations (EC50 0.01–6.59 μM). The most photocytotoxic derivative showed very high selectivity and photocytotoxicity indexes (SI = 72–86, PTI>5000), along with a triplet excited state with exceptionally long lifetime (18.0 μs) and high molar absorptivity (29781 ± 180 M−1cm−1 at λmax 315 nm). The light-induced production of ROS promptly induced an unquenchable apoptotic process selectively in tumor cells, with mitoch…

Pharmaceutical ScienceApoptosisMitochondrionPhotochemiotherapy; Photosensitizing agents; Reactive oxygen species; [123]Triazolo[45-h][16]naphthyridines; [13]oxazolo[54-h][16]naphthyridines; Pharmacology; Drug Discovery; Pharmaceutical Science; Organic Chemistry01 natural sciencesMedicinal chemistry[13]oxazolo[54-h][16]naphthyridinechemistry.chemical_compoundDrug Discovery6]naphthyridineschemistry.chemical_classification0303 health sciencesTumorPhotosensitizing AgentsCell DeathSinglet OxygenSinglet oxygenPhotochemiotherapy; Photosensitizing agents; Reactive oxygen species; [1; 2; 3]Triazolo[4; 5-h][1; 6]naphthyridines; [1; 3]oxazolo[5; 4-h][1; 6]naphthyridines; Apoptosis; Cell Death; Cell Line; Tumor; Humans; Lysosomes; Mitochondria; Naphthyridines; Photochemotherapy; Photosensitizing Agents; Reactive Oxygen Species; Singlet OxygenGeneral MedicineLysosomeMitochondriaExcited stateReactive oxygen specie5-h][1HumanProgrammed cell death2NaphthyridinePhotochemiotherapy3]Triazolo[4Cell Line03 medical and health sciences4-h][1Cell Line TumorHumansNaphthyridines030304 developmental biologyPharmacologyReactive oxygen speciesPhotosensitizing agent010405 organic chemistryOrganic ChemistryApoptosi0104 chemical sciences3]oxazolo[5chemistryPhotochemotherapyCell cultureApoptosis[123]Triazolo[45-h][16]naphthyridine[1LysosomesReactive Oxygen SpeciesDerivative (chemistry)
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Synthesis and antiproliferative mechanism of action of pyrrolo[3′,2′:6,7] cyclohepta[1,2-d]pyrimidin-2-amines as singlet oxygen photosensitizers

2016

A new series of pyrrolo[3′,2′:6,7]cyclohepta[1,2-d]pyrimidin-2-amines, was conveniently prepared using a versatile and high yielding multistep sequence. A good number of derivatives was obtained and the cellular photocytotoxicity was evaluated in vitro against three different human tumor cell lines with EC50 (0.08–4.96 μM) values reaching the nanomolar level. Selected compounds were investigated by laser flash photolysis. The most photocytotoxic derivative, exhibiting a fairly long-lived triplet state (τ ∼ 7 μs) and absorbance in the UV–Vis, was tested in the photo-oxidations of 9,10-anthracenedipropionic acid (ADPA) by singlet oxygen. The photosentizing properties are responsible for the c…

0301 basic medicinemedicine.medical_treatmentPhotodynamic therapyChemistry Techniques SyntheticAntiproliferative activityPhotochemistry01 natural sciencesPhotodynamic therapychemistry.chemical_compound7]cyclohepta[1Drug DiscoveryTriplet stateAmineschemistry.chemical_classificationPhotosensitizing AgentsCell DeathSinglet OxygenChemistrySinglet oxygenGeneral MedicineAntiproliferative activity; Photodynamic therapy; Photosensitizing agents; Pyrrolo[3′; 2′:6; 7]cyclohepta[1; 2-d]pyrimidin-2-amines; Reactive oxygen species; Drug Discovery3003 Pharmaceutical Science; Organic Chemistry; PharmacologyPyrrolo[3′2′:67]cyclohepta[12-d]pyrimidin-2-amineSettore ING-IND/22 - Scienza E Tecnologia Dei Materiali2-d]pyrimidin-2-aminesFlash photolysisReactive oxygen specieKineticsAntineoplastic AgentsAbsorbance03 medical and health sciencesCell Line TumormedicineHumansPyrrolo[3′Cell ProliferationPharmacologyReactive oxygen speciesPhotosensitizing agentPhotolysis010405 organic chemistry2′:6Drug Discovery3003 Pharmaceutical SciencePhotodissociationOrganic ChemistryCombinatorial chemistrySettore CHIM/08 - Chimica Farmaceutica0104 chemical sciencesAntiproliferative activity; Photodynamic therapy; Photosensitizing agents; Pyrrolo[3′2′:67]cyclohepta[12-d]pyrimidin-2-amines; Reactive oxygen species; Drug Discovery3003 Pharmaceutical Science; Organic Chemistry; PharmacologyKinetics030104 developmental biologyDrug DesignReactive oxygen species
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Pyrrolo[3',2':6,7]cyclohepta[1,2-b]pyridines with potent photo-antiproliferative activity.

2017

Abstract Pyrrolo[3′,2′:6,7]cyclohepta[1,2-b]pyridines were synthesized as a new class of tricyclic system in which the pyridine ring is annelated to a cycloheptapyrrole scaffold, with the aim of obtaining new photosensitizing agents with improved antiproliferative activity and lower undesired toxic effects. A versatile synthetic pathway was approached, which allowed the isolation of derivatives of the title ring system with a good substitution pattern on the pyrrole moiety. Photobiological studies revealed that the majority of the new compounds showed a potent cytotoxic effect upon photoactivation with light of the proper wavelength, especially when decorated with a 2-ethoxycabonyl group an…

0301 basic medicineLightPyridines01 natural sciencesAntioxidantschemistry.chemical_compound7]cyclohepta[1NeoplasmsDrug DiscoveryTumor Cells CulturedMoietyPyrrolechemistry.chemical_classificationPhotosensitizing AgentsGeneral MedicinePhotosensitizing AgentPyrrolo[3′2′:67]cyclohepta[12-b]pyridine-9(1H)-oneReactive oxygen speciemedicine.symptomPhototoxicity2-b]pyridine-9(1H)-onesStereochemistryBlotting WesternPhoto-antiproliferative activityAntineoplastic AgentsRing (chemistry)Phototoxicity03 medical and health sciencesStructure-Activity RelationshipPyridinemedicineHumansPyrrolo[3′PyrrolesCell ProliferationPharmacologyPhotosensitizing agent010405 organic chemistry2′:6Drug Discovery3003 Pharmaceutical ScienceOrganic ChemistryPhoto-antiproliferative activity; Photosensitizing agents; Phototoxicity; Pyrrolo[3′2′:67]cyclohepta[12-b]pyridine-9(1H)-ones; Reactive oxygen species; Pharmacology; Drug Discovery3003 Pharmaceutical Science; Organic ChemistryCombinatorial chemistry0104 chemical sciences030104 developmental biologychemistryMechanism of actionPhoto-antiproliferative activity; Photosensitizing agents; Phototoxicity; Pyrrolo[3′; 2′:6; 7]cyclohepta[1; 2-b]pyridine-9(1H)-ones; Reactive oxygen species; Pharmacology; Drug Discovery3003 Pharmaceutical Science; Organic ChemistryDrug Screening Assays AntitumorReactive Oxygen SpeciesTricyclicEuropean journal of medicinal chemistry
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