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001-es BibID:BIBFORM029944
Első szerző:Márián Teréz (radiobiológus)
Cím:Hypoglycemia activates compensatory mechanism of glucose metabolism of brain / Marian, T., Balkay, L., Fekete, I., Lengyel, Z., Veress, G., Esik, O., Tron, L., Krasznai, Z.
Dátum:2001
ISSN:0236-5383
Megjegyzések:The effect of plasma glucose concentration on the cerebral uptake of [18F]-fluorodeoxy-D-glucose (FDG) was studied in a broad concentration range in a rabbit brain model using dynamic FDG PET measurements. Hypoglycemic and hyperglycemic conditions were maintained by manipulating plasma glucose applying i.v. glucose or insulin load. FDG utilization (K) and cerebral glucose metabolic rate (CGMR) were evaluated in a plasma glucose concentration range between 0.5 mM and 26 mM from the kinetic constant k1, k2, k3 obtained by the Sokoloff model of FDG accumulation. A decreasing set of standard FDG uptake values found with increasing blood glucose concentration was explained by competition between the plasma glucose and the radiopharmacon FDG. A similar trend was observed for the forward kinetic constants k1, and k3 in the entire concentration range studied. The same decreasing tendency of k2 was of a smaller magnitude and was reverted at the lowest glucose concentrations where a pronounced decrease of this backward transport rate constant was detected. Our kinetic data indicate a modulation of the kinetics of carbohydrate metabolism by the blood glucose concentration and report on a special mechanism compensating for the low glucose supply under conditions of extremely low blood glucose level.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény hazai lapban
Megjelenés:Acta Biologica Hungarica. - 52 : 1 (2001), p. 35-45. -
További szerzők:Balkay László (1963-) (biofizikus) Fekete István (1951-) (neurológus, pszichiáter) Lengyel Zsolt (nukleáris medicina szakorvos) Veress Gábor (1971-) (neurobiológus) Ésik Olga Trón Lajos (1941-) (biofizikus) Krasznai Zoltán (1950-) (biofizikus)
Internet cím:DOI
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001-es BibID:BIBFORM001421
Első szerző:Márián Teréz (radiobiológus)
Cím:NA+/Ca2+ exchanger inhibitors modify the accumulation of tumor-diagnostic PET tracers in cancer cells / Márián T., Szabó-Péli J., Németh E., Trón L., Friedlander E., Szabó A., Balkay L., Veress G., Krasznai Z.
Dátum:2007
Megjegyzések:To establish the effects of Na(+)/Ca(2+) exchanger (NCX) blockers on 2-[(18)F]fluoro-2-deoxy-D-glucose ((18)FDG) and (11)C-choline accumulation in different cancer cells. METHODS: The tumor cells were incubated with NCX inhibitors, and the uptakes of (18)FDG and (11)C-choline were measured. Flow cytometric measurements of intracellular Ca(2+) and Na(+) concentrations were carried out. The presence of the NCX antigen in the cancer cells was proved by Western blotting, flow cytometry and confocal laser scanning microscopy. RESULTS: The NCX is expressed at a noteworthy level in the cytosol and on the cytoplasmic membrane of the examined cells. Incubation of the cells with three chemically unrelated NCX blockers (bepridil, KB-R7943 or 3',4'-dichlorobenzamil hydrochloride) resulted in an increase in the intracellular Ca(2+) concentration, with a simultaneous decrease in the intracellular Na(+) concentration. The treatment with the NCX inhibitors increased the energy consumption of the tumor cells by 50-100%. Thapsigargin abolished the NCX-induced (18)FDG accumulation in the cells. The NCX blockers applied decreased the (11)C-choline accumulation of all the investigated cancer cells by 60-80% relative to the control. CONCLUSION: A possible masking effect of NCX medication must be taken into consideration during the diagnostic interpretation of PET scans.
Tárgyszavak:Orvostudományok Természettudományok Elméleti orvostudományok Biológiai tudományok Gyógyszerészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:European Journal of Pharmaceutical Sciences. - 30 : 1 (2007), p. 56-63. -
További szerzők:Szabó-Péli Judit (1977-) (kutató) Németh Enikő (1977-) (vegyész) Trón Lajos (1941-) (biofizikus) Friedländer Elza (1980-) (biofizikus) Szabó Anna (1945-) (orvos) Balkay László (1963-) (biofizikus) Veress Gábor (1971-) (neurobiológus) Krasznai Zoltán (1950-) (biofizikus)
Internet cím:elektronikus változat
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DOI
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