title: Synthesis, structural investigations on organotin(IV) chlorin-e6 complexes, their effect on sea urchin embryonic development and induced apoptosis.
abstract: Four new organotin(IV) chlorin derivatives, [chlorin=chlorin-e(6)=21H,23H-porphine-2-propanoic acid, 18-carboxy-20-(carboxymethyl)-8-ethenyl-13-ethyl-2,3-di-hydro-3,7,12,17-tetramethyl-(2S-trans)-], with formula (R(2)Sn)(3)(chlorin)(2).2H(2)O (R=Me, n-Bu) and (R(3)Sn)(3)chlorin.2H(2)O (R=Me, Ph) have been synthesized. The solid state and solution phase structures have been investigated by FT-IR, (119)Sn Mössbauer, (1)H and (13)C NMR spectroscopy. In the solid state, (R(2)Sn)(3)(chlorin)(2).2H(2)O complexes contain six coordinated Sn(IV), in a skew trapezoidal environment by forming trans-R(2)SnO(4) polymeric units. As far as (R(3)Sn)(3)chlorin.2H(2)O complexes are concerned, Sn(IV) is five coordinated in a polymeric (oligomeric) trigonal bipyramidal environment and eq-R(3)SnO(2) units, in the solid state. In saturated solutions, a polymeric structure comparable to the solid phase, with carboxylate groups of the ligand behaving in monoanionic bidentate fashion bridging Sn(IV) atoms, was detected for the (Me(3)Sn)(3)chlorin.2H(2)O complex, while in more diluted ones a tetrahedral configuration for the trimethyltin(IV) moieties was observed. Cytotoxic activity of the novel organotin(IV) chlorin was investigated in order to assay the effect on sea urchin embryonic development. The results obtained demonstrated that (n-Bu(2)Sn)(3)(chlorin)(2).2H(2)O and (Ph(3)Sn)(3)chlorin.2H(2)O exerted the antimitotic effect on the early stages of sea urchin development. In addition, the cytotoxic effect exerted by (n-Bu(2)Sn)(3)(chlorin)(2).2H(2)O appeared with necrosis of the blastomeres, which were clearly destroyed. After treatment with (Ph(3)Sn)(3)chlorin.2H(2)O, a programmed cell death was triggered, as shown by light microscope observations through morphological assays. The apoptotic events in 2-cell stage embryos revealed: (i) DNA fragmentation, with the TUNEL reaction (terminal deoxynucleotidyl transferase-mediated dUTP nick end labelling); (ii) phosphatidylserine translocation in the membrane, with Annexin-V assay and (iii) cytoplasm blebbing, with the TUNEL reaction. The results demonstrated that the novel compound (Ph(3)Sn)(3)chlorin.2H(2)O was the most toxic derivative, by exerting antimitotic effect very early and by triggering apoptosis in the 2-cell stage of sea urchin embryonic development.
authors.affiliation: Dipartimento di Chimica Inorganica e Analitica Stanislao Cannizzaro, Università di Palermo, Viale delle Scienze, Parco d'Orleans II, 90128 Palermo, Italy.
authors.forename: Claudia
authors.initials: C
authors.lastname: Pellerito
authors.forename: Paolo
authors.initials: P
authors.lastname: D'Agati
authors.forename: Tiziana
authors.initials: T
authors.lastname: Fiore
authors.forename: Caterina
authors.initials: C
authors.lastname: Mansueto
authors.forename: Valentina
authors.initials: V
authors.lastname: Mansueto
authors.forename: Giancarlo
authors.initials: G
authors.lastname: Stocco
authors.forename: László
authors.initials: L
authors.lastname: Nagy
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Pellerito
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D001757:Blastomeres / Q000166:cytology / Q000187:drug effects; D002735:Chlorophyllides; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009947:Organotin Compounds / Q000138:chemical synthesis* / Q000737:chemistry / Q000633:toxicity*; D047328:Paracentrotus / Q000166:cytology / Q000187:drug effects* / Q000196:embryology*; D011166:Porphyrins / Q000138:chemical synthesis* / Q000737:chemistry / Q000633:toxicity*; D017550:Spectroscopy, Fourier Transform Infrared; D015204:Spectroscopy, Mossbauer
chemical_list: D002735:Chlorophyllides; D009947:Organotin Compounds; D011166:Porphyrins; C062985:phytochlorin