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  • Title: In vivo adriamycin-induced apoptosis in peritoneal murine macrophages: partial participation of a caspase cascade.
    Author: Domínguez-Rodríguez JR, Chaparro-Huerta V, Hernández-Flores G, Gómez-Contreras PC, Lerma-Dáz JM, Ortiz-Lazareno PC, Cervantes-Munguia R, Orbach-Arbouys S, Scott-Algara D, Cuellar AB.
    Journal: Anticancer Res; 2004; 24(5A):2689-96. PubMed ID: 15517873.
    Abstract:
    BACKGROUND: Adriamycin (ADM) is a potent antitumor drug that induces apoptosis (AP) in tumor cells. AP is modulated by caspases and by mitogen-activated protein kinases (MAPK) as well as by the mitochondrial membrane potential (deltapsim). We studied the participation of these systems in peritoneal macrophages from ADM-treated mice. MATERIALS AND METHODS: Balb/c mice were either treated with ADM (5 mg/kg, i.p.) or with 0.85% NaCl solution (controls). One hour later, peritoneal cells were harvested and cultured for 28 h. AP was evaluated by ethidium bromide and acridine orange staining; deltapsim was monitored using a MitoCapture stain Kit; DNA integrity was assessed by electrophoretic analysis. Animals were treated (i.p.) 1 h before ADM administration with Z-LEHD-FMK, Z-DEVD-FMK, or Z-VAD-FMK (caspase-9, caspases-3, 7,10 and general caspase inhibitors, respectively) or with PD169316 (a MAPKp38 inhibitor). RESULTS: ADM induced a higher rate of AP and the characteristic electrophoretic DNA ladder pattern. Mice treated with caspases inhibitors plus ADM showed significant reductions in AP and DNA laddering; in contrast, no differences were observed in mice treated with PD169316 plus ADM in comparison with ADM alone. ADM also induced early loss of the deltapsim. CONCLUSION: In these experimental conditions, ADM induced AP in a mainly caspase-9-dependent manner and this was related to a reduction in the deltapsim.
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