title: Effects of two organotin(IV)(sulfonatophenyl)porphinates on MAPKs and on the growth of A375 human melanoma cells.
abstract: Previously we showed apoptotic induction in A375 human melanoma cells using two complexes of the meso-tetra(4-sulfonatophenyl)porphinate (TPPS), (Bu2Sn)2TPPS and (Bu3Sn)4TPPS. To understand how these compounds activate apoptosis in melanoma cells we studied MAPKs and the (Bu2Sn)2TPPS and (Bu3Sn)4TPPS cellular uptake. Western blotting experiments showed activated protein kinases ERK 1/2, JNK and p38 in 10 microM (Bu2Sn)2TPPS- and 1 microM (Bu3Sn)4TPPS-treated melanoma cells, which suggests that the three MAP kinases are involved in the apoptotic death of A375-treated cells. By taking advantage of the porphyrin fluorescence, we found a fast concentration of (Bu2Sn)2TPPS and (Bu3Sn)4TPPS in the nucleus and in the nucleoli compared to TPPS. A significantly reduced growth of A375 human melanoma cells was also observed after only 48 h treatment by using 500 nM of (Bu2Sn)2TPPS or 80 nM of (Bu3Sn)4TPPS. A strong slowdown of cell growth and loss of cell-cell interactions were visible by in vitro wound repair assay.
authors.affiliation: Istituto di Biomedicina e Immunologia Molecolare Alberto Monroy, Consiglio Nazionale delle Ricerche, 90146 Palermo, Italy. costama@ibim.cnr.it
authors.forename: Maria Assunta
authors.initials: MA
authors.lastname: Costa
authors.forename: Letizia
authors.initials: L
authors.lastname: Gulino
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Pellerito
authors.forename: Tiziana
authors.initials: T
authors.lastname: Fiore
authors.forename: Claudia
authors.initials: C
authors.lastname: Pellerito
authors.forename: Giovanna
authors.initials: G
authors.lastname: Barbieri
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects; D015153:Blotting, Western; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects*; D006801:Humans; D008545:Melanoma / Q000378:metabolism*; D036641:Microscopy, Fluorescence, Multiphoton; D020928:Mitogen-Activated Protein Kinases / Q000187:drug effects* / Q000378:metabolism; D009947:Organotin Compounds / Q000494:pharmacology*; D011166:Porphyrins / Q000494:pharmacology*
chemical_list: D000970:Antineoplastic Agents; D009947:Organotin Compounds; D011166:Porphyrins; C016136:tetraphenylporphine sulfonate; D020928:Mitogen-Activated Protein Kinases