BACKGROUND: The effects of bacterial eradication therapy cannot be fully explained simply by elimination of the target bacteria, if one considers the effects of eradication therapy in H. pylori-negative cases of low-grade malignancy MALTomas of the rectum. The present study was undertaken to examine the possibility and mechanism of direct induction of apoptosis of the tumor cells by the antibiotics used for bacterial eradication therapy. MATERIALS AND METHODS: A B cell lymphoma cell line (300-19) derived from BALB/c mice was co-cultured with amoxicillin or clarithromycin, and amoxicillin and clarithromycin at concentrations equal to or 1/10 x MIC of either drug. Cells co-cultured with 1/100 x MIC of the standard anti-tumor agents, adriamycin, vincristine and cyclophosphamide, served as positive controls. Cells cultured without any antibiotic or anti-tumor agent served as controls. In each group, the following analyses were performed: (i) the time-course of changes in the cellular morphology, (ii) the time-course of occurrence of DNA fragmentation, (iii) the appearance of apoptotic changes as evaluated by trypan blue staining, (iv) Bcl-2 expression as examined by immunoblotting; and (v) the expression of TNFR1, Fas, FasL and caspase-3, -8 and -9, as evaluated by immunoblotting. RESULTS: Cells treated with amoxicillin and clarithromycin showed the formation of apoptotic bodies, and degeneration and detachment of the cells in a dose-dependent manner. DNA fragmentation was induced in these cells to a degree similar to that seen in cells treated with the anti-tumor agents. Trypan blue staining also demonstrated apoptosis of the cells and loss of cell viability. Bcl-2 expression was seen only in the control group and FasL was never seen, while the expression of TNFR1, Fas and caspase-3, -8 and -9 was seen in the amoxicillin-treated group, clarithromycin-treated group, amoxicillin and clarithromycin-treated group and the positive control group. CONCLUSION: Antibiotics used for the eradication of H. pylori can also directly induce apoptosis in mouse B cell lymphoma cells, an action which involves the TNF system.
BACKGROUND: The effects of bacterial eradication therapy cannot be fully explained simply by elimination of the target bacteria, if one considers the effects of eradication therapy in H. pylori-negative cases of low-grade malignancy MALTomas of the rectum. The present study was undertaken to examine the possibility and mechanism of direct induction of apoptosis of the tumor cells by the antibiotics used for bacterial eradication therapy. MATERIALS AND METHODS: A B cell lymphoma cell line (300-19) derived from BALB/c mice was co-cultured with amoxicillin or clarithromycin, and amoxicillin and clarithromycin at concentrations equal to or 1/10 x MIC of either drug. Cells co-cultured with 1/100 x MIC of the standard anti-tumor agents, adriamycin, vincristine and cyclophosphamide, served as positive controls. Cells cultured without any antibiotic or anti-tumor agent served as controls. In each group, the following analyses were performed: (i) the time-course of changes in the cellular morphology, (ii) the time-course of occurrence of DNA fragmentation, (iii) the appearance of apoptotic changes as evaluated by trypan blue staining, (iv) Bcl-2 expression as examined by immunoblotting; and (v) the expression of TNFR1, Fas, FasL and caspase-3, -8 and -9, as evaluated by immunoblotting. RESULTS: Cells treated with amoxicillin and clarithromycin showed the formation of apoptotic bodies, and degeneration and detachment of the cells in a dose-dependent manner. DNA fragmentation was induced in these cells to a degree similar to that seen in cells treated with the anti-tumor agents. Trypan blue staining also demonstrated apoptosis of the cells and loss of cell viability. Bcl-2 expression was seen only in the control group and FasL was never seen, while the expression of TNFR1, Fas and caspase-3, -8 and -9 was seen in the amoxicillin-treated group, clarithromycin-treated group, amoxicillin and clarithromycin-treated group and the positive control group. CONCLUSION: Antibiotics used for the eradication of H. pylori can also directly induce apoptosis in mouse B cell lymphoma cells, an action which involves the TNF system.
Authors: Francesca Gay; S Vincent Rajkumar; Morton Coleman; Shaji Kumar; Tomer Mark; Angela Dispenzieri; Roger Pearse; Morie A Gertz; John Leonard; Martha Q Lacy; Selina Chen-Kiang; Vivek Roy; David S Jayabalan; John A Lust; Thomas E Witzig; Rafael Fonseca; Robert A Kyle; Philip R Greipp; A Keith Stewart; Ruben Niesvizky Journal: Am J Hematol Date: 2010-09 Impact factor: 10.047
Authors: Noemi Puig; Miguel T Hernández; Laura Rosiñol; Esther González; Felipe de Arriba; Albert Oriol; Verónica González-Calle; Fernando Escalante; Javier de la Rubia; Mercedes Gironella; Rafael Ríos; Ricarda García-Sánchez; José M Arguiñano; Adrián Alegre; Jesús Martín; Norma C Gutiérrez; María J Calasanz; María L Martín; María Del Carmen Couto; María Casanova; Mario Arnao; Ernesto Pérez-Persona; Sebastián Garzón; Marta S González; Guillermo Martín-Sánchez; Enrique M Ocio; Morton Coleman; Cristina Encinas; Ana M Vale; Ana I Teruel; María Cortés-Rodríguez; Bruno Paiva; M Teresa Cedena; Jesús F San-Miguel; Juan J Lahuerta; Joan Bladé; Ruben Niesvizky; María-Victoria Mateos Journal: Blood Cancer J Date: 2021-05-21 Impact factor: 11.037