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Current Topics in Tumor Cell Physiology and by M. J. Weber (auth.), Prof. Dr. Wolfram H. Knapp, Prof. Dr.

By M. J. Weber (auth.), Prof. Dr. Wolfram H. Knapp, Prof. Dr. Karel Vyska (eds.)

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Extra resources for Current Topics in Tumor Cell Physiology and Positron-Emission Tomography

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We studied the possibility that the D-glucose transport was altered during in vitro cell transformation and consistently found that the transport system was enhanced, as evidenced by the initial rate of D-glucose uptake, during the process of transformation and continuing in the transformed state. To dissociate the increased D-glucose uptake from the overall change of glycolysis after transformation, 3-0-methyl-D-glucose and 2-deoxy-D-glucose were used. The kinetic analyses c1early demonstrate that the transport was enhanced by oncogenic transformation and that the transport was the first rate limiting step of D-glucose uptake in transformed cells.

Int J Cancer 12; 602-612 Hatanaka M (1975) Transport of sugars across the tumor cell membrane. Cellular Membranes and Tumor Cell Behavior. Baltimore, Maryland, Williams and Wilkins Co, pp 114-172 Hatanaka M, Augl C and Gilden RV (1970a) Evidence for a functional change in the plasma membrane ofmurine sarcoma virus-infected mouse embryo cells. J Biol Chem 245; 714-717 Hatanaka M, Hanafusa H (1970b) Analysis of a functional change in membrane in the process of cell transformation by Rous sarcoma virus; Alteration in the characteristics of sugar transport.

Under steady state conditions, we have (3) j=q. Substituting expressions (1) and (2) into (3), we obtain for glucose transport across the BBB - D( Oe) r = ro = Vmax Qc kM = Cs +c b . (Csb-Cs,) at the reaction surface. (4) s, Under these conditions, if the capillary is considered to be a tube, the mass transfer of glucose in the capillary can be described by the following equation (see Appendix 11) Zo ~ Cj·y·(-n)dS- ~ co ·y·ndS=2JZfo ~ s; So 0 Vmax • ( CSb-S) dz KM + CSb +cs, (5) where ro is capillary radius, Zo the capillary length, Si the area of capillary at inflow, So the area of capillary at the outflow crossection, Ci and Co are the glucose concentrations in plasma on the arterial and venous side of the capillary, respectively.

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