RESUMO
Electrochemotherapy was instituted for sarcoma, and the tumor inhibitory ratio, curing ratio, vascular endothelial growth factor, microvessel density and mechanism were measured and analyzed. The results indicate that the curing ratio of electrochemotherapy for sarcoma is 84.6%. The present research provides experimental evidence for the security, mechanism and feasibility of electrochemotherapy in clinical practice.
Assuntos
Animais , Camundongos , Antineoplásicos , Bleomicina , Sistemas de Liberação de Medicamentos , Métodos , Eletroquimioterapia , Métodos , Eletroporação , Métodos , Sarcoma 180 , Terapêutica , Fator A de Crescimento do Endotélio VascularRESUMO
In this paper are analyzed the effect of electrochemotherapy and its mechanism. The favorable parameter of electric pulses (EP) was studied in vitro using the S-180 cells exposed to various EP. After the tumor model was copied, the tumor-bearing mice were randomly divided into four groups: control, chemotherapy, electrotherapy, and electrochemotherapy. The tumor inhibitory ratio, the cure ratio and the level of oxygen free radicals (OFR) were determined. The inhibitory ratio and cure ratio of electrochemotherapy group were significantly higher than those in the chemotherapy, electrotherapy and control groups (P < 0.05). The injury of OFR was decreased while the immunological competence was increased. The mechanism of electrochemotherapy may be related with the enhancement of cell membranepermeability, the depression of drug resistance, the improvement of immunological competence, and so on.
Assuntos
Animais , Camundongos , Antineoplásicos , Bleomicina , Sistemas de Liberação de Medicamentos , Métodos , Terapia por Estimulação Elétrica , Métodos , Eletroquímica , Eletroporação , Métodos , Distribuição Aleatória , Sarcoma 180 , TerapêuticaRESUMO
In this paper is reported a new approach for the treatment of sarcoma--electroporation therapy. Electroporation can accelerate pharmacal molecules into cytoplasm by transient electromagnetic pulses. We have utilized the phenomenon of electroporation treating the S-180 sarcomas in the hind legs of the Kunming mice by intratumoral injection of anti-tumor agent at low dose. From the experiment, we learned that this approach can bring about remarkable effect. The technical procedure is easy to do and easy to control. Especially, it is useful in curing the flat tumor and has little untoward side effect. It deserves to be recommended as a new approach to treating the tumor in clinics.
Assuntos
Animais , Camundongos , Antineoplásicos , Usos Terapêuticos , Apoptose , Linhagem Celular Tumoral , Ciclofosfamida , Usos Terapêuticos , Eletroquimioterapia , Métodos , Transplante de Neoplasias , Sarcoma 180 , Tratamento Farmacológico , PatologiaRESUMO
Electrochemotherapy (ECT) is a novel cancer treatment in which electric pulses (EPs) inducing cell membrane pored (electroporation) are used as a means of delivering antitumor drugs to the cytoplasm of cancer cells. The minimal thresholds of electric field strength of in vitro tumor cell line and tumor tissue are 450-650 V/cm and 400-600 V/cm, respectively. The typical electrical requirement is 600-1300 V/cm, pulse width of 100 micros, 8 pulses, 1 Hz. More than 10 kinds of antitumor drugs have been applied to ECT, in which the most efficacious drug is Bleomycin, and then Cisplatin. Some exciting inhibitory effects on cells in vitro and on solid tumors in clinical trials have been noticed. The factors influencing ECT effects include the electric parameters, diameter of electrode, distribution of electric field lines, size of tumor, model of drugs injection and kinds of drugs. Some questions of ECT are still open, such as the dosages and kinds of drugs for clinical trials, model of drug injection, influence on normal tissues, therapeutic mechanism.
Assuntos
Humanos , Antibióticos Antineoplásicos , Antineoplásicos , Bleomicina , Cisplatino , Terapia por Estimulação Elétrica , Métodos , Eletroquímica , Eletroporação , Métodos , Neoplasias , TerapêuticaRESUMO
We chose Hela cells as research object and studied the cytotoxicity generated by cyclophosphamide, an antitumor drug, after cell electroporation by the use of electromagnetic pulses. Comparison between the electroporation group and the contrast group revealed the greatly enhanced cytotoxicity of the electroporation group, indicating that under some conditions electromagnetic pulses can enhance the cytotoxicity of antitumor drugs. The results of this study provide reliable evidences and a feasible approach for clinical treatment of tumor.
Assuntos
Humanos , Antineoplásicos , Farmacologia , Apoptose , Sobrevivência Celular , Ciclofosfamida , Farmacologia , Ensaios de Seleção de Medicamentos Antitumorais , Fenômenos Eletromagnéticos , Eletroporação , Métodos , Células HeLaRESUMO
This article reports the experiment studies on treating the S-180 sarcomas of KM mice with high-intensity electric pulse and antitumor drug (cyclophosphamide). The results showed that the experimental group of electric field combined with drug has the best effect on tumor, compared with the control group. In addition, electric field can inhibit the formation of vas Capillaries and decrease the supply of nutrition for tumor cell. In conclusion, electric field has inhibited the growth of tumor.