61. 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: 199; Prenosov: 47
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64. 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: 188; Prenosov: 44
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65. 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: 211; Prenosov: 45
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67. 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: 255; Prenosov: 56
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68. 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: 195; Prenosov: 57
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