Sulofenur cytotoxicity and changes in cytosolic calcium and mitochondrial membrane potential in human colon adenocarcinoma cell lines.
Sulofenur treatment (12.5 microM-1 mM) of colon adenocarcinoma cell lines resulted in dose- and time-dependent cell killing. LYc5 cells were viable longer than GC3/c1 cells. Each concentration resulted in elevation of cytosolic calcium [Ca2+]i) for both cell lines. At lower doses, elevation was delayed for LYc5 cells. GC3/c1 cells after 1 mM treatment in Ca(2+)-free HBSS showed no rise of [Ca2+]i. GC3/c1 cells after carbonyl cyanide-m-chlorophenylhydrazone rapidly lost rhodamine 123 fluorescence from mitochondria; after 1 mM sulofenur, fluorescence faded slowly. Following treatment, cells became rounded, blebs formed and the cells died. Results suggest that elevated [Ca2+]i plays an important role in sulofenur cytotoxicity.
Department of Pathology, University of Maryland School of Medicine, Baltimore 21201.
P C
PC
Phelps
P T
PT
Jain
I K
IK
Berezesky
G B
GB
Boder
B F
BF
Trump
D000230:Adenocarcinoma / Q000473:pathology*; D002118:Calcium / Q000378:metabolism*; D016923:Cell Death / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D003110:Colonic Neoplasms / Q000473:pathology*; D003600:Cytosol / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D006801:Humans; D066298:In Vitro Techniques; D008564:Membrane Potentials / Q000187:drug effects; D008854:Microscopy, Electron; D008928:Mitochondria / Q000502:physiology*; D013453:Sulfonylurea Compounds / Q000633:toxicity*; D014407:Tumor Cells, Cultured
D013453:Sulfonylurea Compounds; D002118:Calcium; C058179:sulofenur