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Alpha methyl glucoside transport by the gill of the oyster ostrea edulis


, : Alpha methyl glucoside transport by the gill of the oyster ostrea edulis. Biological Bulletin (Woods Hole) 161(3): 416-425

The glucose transport system in the gill of O. edulis was studied using .alpha.-methyl[U-14C]glucoside. The same mobile carrier transported .alpha.-methylglucoside (.alpha.-MG) and D-glucose in the isolated gill. Unlike D-glucose .alpha.-MG was not appreciably metabolized to CO2. The mobile carrier probably is specific for the hydroxyl group at the C3 position of D-glucose. Ouabain (0.1 mM) did not reduce .alpha.-MG uptake; this suggests that Na+ transport was either via an ouabain insensitive pump or an ouabain sensitive pump inaccessible to ouabain dissolved in seawater, the external medium. Compounds capable of collapsing the transmembrane electrical potential reduced .alpha.-G uptake. Naphthalene, a compound known to hyperpolarize muscle cells, stimulated .alpha.-MG uptake. Inner leaks via the mobile carrier were much greater than outer leaks. The glucose transport system in the oyster gill has many similarities to Na+-dependent transport of glucose in mammalian small intestines and proximal renal tubules. Naphthalene stimulation of .alpha.-MG uptake is consistent with a previous study demonstrating naphthalene stimulation of glucose metabolism in gill tissue.

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