title: Rhodamine 123 alters the mitochondrial ultrastructure of cultured L1210 cells.
abstract: Exposure of exponentially growing L1210 cells in vitro to 5-10 micrograms/ml of rhodamine 123 (R123) for 16-48 hr inhibits cell proliferation and induces cell arrest in the G1A phase of the cell cycle. The cells remain viable during the arrest and resume growth after removal of R123; extended exposure to R123 is cytotoxic. Exposure to R123 results in morphological alterations in mitochondria of all cells observed; specifically, mitochondria of R123-treated cells are characterized by a distention of the intracristal spaces and a significant increase in the number of matrix granules. Gross morphological changes of mitochondria include formation of extended organelles and the appearance of doughnut-shaped structures.
mesh_terms: D000818:Animals; D002453:Cell Cycle / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D004396:Coloring Agents / Q000494:pharmacology; D066298:In Vitro Techniques; D007939:Leukemia L1210 / Q000473:pathology*; D051379:Mice; D008854:Microscopy, Electron; D008928:Mitochondria / Q000187:drug effects* / Q000648:ultrastructure; D020112:Rhodamine 123; D012235:Rhodamines / Q000494:pharmacology*; D014966:Xanthenes / Q000494:pharmacology*
chemical_list: D004396:Coloring Agents; D012235:Rhodamines; D014966:Xanthenes; D020112:Rhodamine 123