title: Synergistic anti-tumor effect of ultrasound and hematoporphyrin on sarcoma180 cells with special reference to the changes of morphology and cytochrome oxidase activity of tumor cells.
abstract: This study is aimed at evaluating the inhibitory effects of the association of hematoporphyrin and ultrasound at variable intensities with a fixed frequency of 1.1MHz in tumor nodules. Specifically, the effects were studied both in solid and ascitic S180 tumors transplanted in mice by clinical, cytochemical and ultrastructural evaluation. The results indicated that the use of hematoporphyrin alone had no significant effect on destroying tumor cells. The ultrasound alone had little effect. Interestingly, the inhibition was much more effective when hematoporphyrin was combined with ultrasound. The inhibition was 3 times better than ultrasound alone and 8 times better than hematoporphyrin used alone. Our results also indicated that the changes on cell structure and cytochrome oxidation activity are important factors that could inhibit tumor cell growth and induce cell death. Apoptosis of tumor cells could be induced by hematoporphyrin. Our study investigated the killing mechanism on S180 tumor cells by using hematoporphyrin and low frequency ultrasound at cell, tissue and individual level.
authors.affiliation: College of Life Science, Shaanxi Normal University, Xiàn, China. lshaof@snnu.edu.cn
authors.forename: L
authors.initials: L
authors.lastname: Quan-hong
authors.forename: S
authors.initials: S
authors.lastname: Shi-hui
authors.forename: X
authors.initials: X
authors.lastname: Ya-ping
authors.forename: Q
authors.initials: Q
authors.lastname: Hao
authors.forename: Z
authors.initials: Z
authors.lastname: Jin-xuan
authors.forename: R
authors.initials: R
authors.lastname: Yao-hui
authors.forename: L
authors.initials: L
authors.lastname: Meng
authors.forename: W
authors.initials: W
authors.lastname: Pan
mesh_terms: D000818:Animals; D017209:Apoptosis; D003131:Combined Modality Therapy; D003576:Electron Transport Complex IV / Q000378:metabolism*; D006415:Hematoporphyrins / Q000627:therapeutic use*; D051379:Mice; D017319:Photosensitizing Agents / Q000627:therapeutic use*; D012510:Sarcoma 180 / Q000000981:diagnostic imaging / Q000201:enzymology / Q000517:prevention & control*; D016896:Treatment Outcome; D014407:Tumor Cells, Cultured; D014464:Ultrasonic Therapy; D014463:Ultrasonography
chemical_list: D006415:Hematoporphyrins; D017319:Photosensitizing Agents; D003576:Electron Transport Complex IV