title: Effects of high hydrostatic pressures on the activity of the membrane ATPases of some organs implicated in hydromineral regulation.
abstract: 1. The effects of high hydrostatic pressures have been studied on the ATPases extracted from tissues implicated in iono- and osmoregulation of a frog and various teleostean fishes. Pressure affects enzyme activity in the same qualitative way, whatever the tissue and the species considered. 2. The Mg2+ ATPase activity is maximally enhanced at 250 kg/cm2. A slight inhibition is observed at higher pressures up to 1000 kg/cm2. 3. The (Na+ + K+)ATPase is little affected by low pressures but strongly inhibited at 500 kg/cm2 and more. 4. The results are discussed in terms of pressure effects on the recently described protein-lipid interaction linked to ATPase activity.
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism*; D000811:Anguilla; D000818:Animals; D005399:Fishes; D005880:Gills / Q000378:metabolism; D006874:Hydrostatic Pressure; D066298:In Vitro Techniques; D007668:Kidney / Q000378:metabolism; D008566:Membranes / Q000378:metabolism; D011896:Rana temporaria; D012867:Skin / Q000378:metabolism; D014882:Water-Electrolyte Balance
chemical_list: D000251:Adenosine Triphosphatases