By P.G. LeFevre
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Additional resources for Active Transport through Animal Cell Membranes
Examining the K + level in the fluid in the Malpighian tubules of eight species of insects (in five different orders), RAMSAY (1953) noted that it always exceeded the level in the haemolymph, while the Na+ gradient was in the opposite direction. Considering the p. d. across the tubular wall, he took this· as evidence of an active extrusion of K + into the tubules. In the mammalian kidney, although the gross fact of reabsorption of salts from the tubule lumen has been appreciated for many years, it was only recently that the question of a cation-transport system here has been given direct attention.
The observations of MUDGE et al. (1949) on Na+ excretion in dogs with severe urea diuresis showed that this ion is reabsorbed even against very considerable concentration gradients. Mercurial diuretics depressed the absolute rate of reabsorption, but did not alter the concentration ratios that could be maintained across the tubular wall. PITTS et al. (1948) concluded from extensive observations in acidotic humans that the urinary acidification is largely accomplished by exchange of H+ for the Na+ reabsorbed in the tubule; the filtered buffer ions could not in themselves account for the quantity of acid eliminated.
Later (SACKS 1944 a, b) it was noted that in the fasting cat the specific activity of the muscle glucose-6-monophosphate (G-6-P) was higher at 2-4 hours after the p32 injection than at 24 hours, whereas that of the other primary organic phosphates continued to rise in relation to the G-6-P. This was taken to indicate that at least part of the G-6-P remained in ready contact with the extracellular compartment, and was probably held at the cell surface, as by adsorption. This "mobilization on the muscle cell membrane·' of G-6-P was distinctly enhanced by glucose administration, and was seen only in fasted cats, not in "post-absorptive" cats.
Active Transport through Animal Cell Membranes by P.G. LeFevre