51. Adenocarcinoma skin metastases treated by electrochemotherapy with cisplatin combined with radiationGregor Serša, Maja Čemažar, Zvonimir Rudolf, Albert-Peter Fras, 1999, izvirni znanstveni članek Povzetek: Background. The aim of this study was to determine the interaction between electrochemotherapy as a means of facilitated cisplatin delivery into the cells and irradiation of adenocarcinoma skin metastases. Case report. A patient with progressive disease presenting skin metastases of tubal dedifferentiated pappilary adenocarcinoma was enrolled in the study. Skin metastases were treated by electrochemotherapy with intratumoral injection of cisplatin. Its antitumor effectiveness was compared to that of combined treatment of irradiation with electrochemotherapy. After a two week observation time, the response to treatment was comparable between the electrochemotherapy and electrochemotherapy combined with irradiation. Both ofthese treatments were more effective than irradiation alone. Furthermore, antitumor effectiveness of the combined electrochemo- and radiotherapy was found to be quicker than that of electrochemotherapy alone. Comment. This study shows that electrochemotherapy with cisplatin is also effective in the treatment of adenocarcinoma skin metastases. Inspite of the short observation time, positive interaction between radiotherapy and electrochemotherapy with cisplatin was found.
Objavljeno v DiRROS: 22.01.2024; Ogledov: 160; Prenosov: 38
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52. Cryosurgery combined with radiotherapy of tumors in miceAlbert-Peter Fras, Simona Kranjc Brezar, Maja Čemažar, Gregor Serša, 1999, izvirni znanstveni članek Povzetek: Tlle aim of this study zuas to determine antitumor effectiveness of cryosurgery alone and in comhination with radiotherapy. Cryosurgery of subcutaneous fibrosarcoma SA-1 tumors in A/J mice was moderately effective trcatmcnt. Tumor growth delay was 10.3 * 3.8 days after 5 minute treatment with nitrogen filled cryo-prohe. Shorter treatment times induced less, but dose dependent antitumor effect. In combined treat- ment, tumors were either first treated by cryosurgery for 3 minutes and then locally irradiated with 10Gy for 5 minutes, or irradiated first and thereafter treated by cryosurgery.The antitumor effectiveness of com- bined treatrnent was sequence dependent; the irradiation of tumors before cryosurgery resulted in better antitumor effect than the irradiation after cryosurgery. These results indicate that radiosensitization may not be always expected, in spite of some reports demonstrating that cryosurgery may have radiosensitizing effect in vivo, and that some other mechanisms may be involved contributing to radiationdamage when cryosurgery follows irradiation.
Objavljeno v DiRROS: 22.01.2024; Ogledov: 176; Prenosov: 47
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53. Plasma membrane fluidity alterations in cancerous tissuesMarjeta Šentjurc, Mihael Sok, Gregor Serša, 1998, izvirni znanstveni članek Povzetek: Plasma membrane is a heterogeneous structure with several coexisting domains having different fluidity characteristics. It plays an important role in the control of cell growth, differentiation and transformation. Fluidity of the whole plasma membrane reflects the ordering and dynamics of phospholipid acyl chains in specific membrane domains, as well as the fraction of each domain inthe membrane. Changes in the membrane fluidity affect processes on the membrane such as transport, enzyme activities and expression of the redeptors.In this paper we present results of our recent electron paramagneticresonance (EPR) studies of plasma membrane fluidity characteristics, which take into account heterogeneous nature of the plasma membrane, By the computer simulation of the EPR spectra line-shapes, the number of coexisting domains in the plasma membrane, their relative portion inthe membrane as well as the ordering and dynamics of each domain be determined. Therefore, we could distinguish the contribution of the relative portion of each domain from the contribution of fulidity alterations in the domain to the entire fluidity changes in the membrane. Two examples will be discussed: membrane fluidity characteristics of excised lung tumor tissues andinfluence of microtubule depolymerizing agent vinblastine on membrane fluidity of vinblastine sensitive and resistant HeLa cells.
Objavljeno v DiRROS: 19.01.2024; Ogledov: 158; Prenosov: 38
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56. Vinblastine increases antitumor effectiveness of bleomycinMaja Čemažar, Marija Auersperg, Gregor Serša, 1997, izvirni znanstveni članek Povzetek: In our previous vinblastine (VELBE) was shown to increase the plasma membrane fluidity. This effect of VELBE might be expolited for better transport of drugs through the plasma membrane. Bleomycin (BLM) is a highly cytotoxic drug when present inside the cells but has a hampered transport through the plasma membrane. The aim of the present study was to determine whether pretreatment with VELBE can increase the effect of BLM on intraperitoneal SA-1 tumors in mice. BLM and VELBE were used as single agents or in various combinations, i.e. VELBE and BLM injected simultanously, BLM injected 24 h before VELBE or VELBE injected 24 h before BLM. Mice survival was the end-point used for determining the effect of this combined treatments. VELBE and BLM as a single treatment significantly prolonged median survival time of study animals compared to controls. Furthermore, when VELBE and BLM were combined, all threetested combinations were more effective than VELBE or BLM as single treatments. The effect on animal survival was equal when VELBE was given 24 h after or simultanously with BLM. The longest survival, however was obtained when VELBE was injected 24 h before BLM. From these results we can conclude that the underlying mechanisms for more than additive effect of VELBE and BLM when VELBE was given 24 h before BLM could be attributed to an increased membrane fluidity, possibly in combination with a cell kinetic effect.
Objavljeno v DiRROS: 18.01.2024; Ogledov: 149; Prenosov: 35
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57. Study of blood perfusion with patent blue staining method in LPB fibrosarcoma tumors in immuno-competent and immuno-deficient mice after electrotherapy by direct currentTomaž Jarm, Dong Jian An, Jean Belehradek, Lluis M. Mir, Gregor Serša, Maja Čemažar, Tadej Kotnik, Jani Pušenjak, Damijan Miklavčič, 1997, izvirni znanstveni članek Objavljeno v DiRROS: 16.01.2024; Ogledov: 156; Prenosov: 35
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59. Electrochemotherapy with bleomycin : The first clinical experience in malignant melanoma patientsZvonimir Rudolf, Borut Štabuc, Maja Čemažar, Damijan Miklavčič, Lojze Vodovnik, Gregor Serša, 1995, izvirni znanstveni članek Ključne besede: melanoma therapy, bleomycin, electric stimulation therapy
Objavljeno v DiRROS: 15.01.2024; Ogledov: 169; Prenosov: 45
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60. Improved therapeutic effect of electrochemotherapy with cisplatin by intratumoral drug administration and changing of electrode orientation for electropermeabilization on EAT tumor model in miceMaja Čemažar, Damijan Miklavčič, Lojze Vodovnik, Tomaž Jarm, Zvonimir Rudolf, Borut Štabuc, Tanja Čufer, Gregor Serša, 1995, izvirni znanstveni članek Ključne besede: neoplasmas, experimental therapy, cisplatin, electric stimulation therapy, cell membrane permeability
Objavljeno v DiRROS: 15.01.2024; Ogledov: 158; Prenosov: 45
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