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Table 2.

Na+,K+-ATPase activity, sodium pump density, and molecular activity of sodium pumps from the brain of mammals and birds

Na+,K+-ATPase activity (μmol Pih-1 mg-1 wet mass)Sodium pump density (pmol g-1 wet mass)Molecular activity (ATP min-1)
Mammals    
   Mouse 4.70±0.26 (9) 3180±407 (9) 28852±4396 (9) 
   Rat 5.01±0.23 (3) 3093±452 (3) 27775±2824 (3) 
   Sheep 2.99±0.19 (4) 5580±488 (4) 9167±1136 (4) 
   Pig 2.72±0.22 (4) 4192±1007 (4) 12914±2924 (4) 
   Cow 3.40±0.18 (4) 5002±321 (4) 11372±514 (4) 
Birds    
   Zebra finch 4.57±0.15 (4) 5262±984 (4) 15848±2551 (4) 
   Sparrow 3.80±0.31 (4) 3251±430 (4) 21537±5164 (4) 
   Starling 3.77±0.15 (4) 7498±995 (4) 8759±1040 (4) 
   Currawong 3.95±0.31 (4) 3841±313 (4) 17502±1873 (4) 
   Pigeon 3.27±0.12 (4) 6720±1476 (4) 9435±2077 (4) 
   Duck 3.60±0.28 (4) 4437±761 (4) 15145±3386 (4) 
   Goose 3.04±0.17 (4) 3559±860 (3) 16559±3426 (3) 
   Emu 2.17±0.10 (4) 2627±287 (4) 14357±1842 (4) 
Na+,K+-ATPase activity (μmol Pih-1 mg-1 wet mass)Sodium pump density (pmol g-1 wet mass)Molecular activity (ATP min-1)
Mammals    
   Mouse 4.70±0.26 (9) 3180±407 (9) 28852±4396 (9) 
   Rat 5.01±0.23 (3) 3093±452 (3) 27775±2824 (3) 
   Sheep 2.99±0.19 (4) 5580±488 (4) 9167±1136 (4) 
   Pig 2.72±0.22 (4) 4192±1007 (4) 12914±2924 (4) 
   Cow 3.40±0.18 (4) 5002±321 (4) 11372±514 (4) 
Birds    
   Zebra finch 4.57±0.15 (4) 5262±984 (4) 15848±2551 (4) 
   Sparrow 3.80±0.31 (4) 3251±430 (4) 21537±5164 (4) 
   Starling 3.77±0.15 (4) 7498±995 (4) 8759±1040 (4) 
   Currawong 3.95±0.31 (4) 3841±313 (4) 17502±1873 (4) 
   Pigeon 3.27±0.12 (4) 6720±1476 (4) 9435±2077 (4) 
   Duck 3.60±0.28 (4) 4437±761 (4) 15145±3386 (4) 
   Goose 3.04±0.17 (4) 3559±860 (3) 16559±3426 (3) 
   Emu 2.17±0.10 (4) 2627±287 (4) 14357±1842 (4) 

Values are means ± s.e.m. (number of preparations in parentheses). Na+,K+-ATPase activity measurements were conducted at 37°C in mammals and are corrected to 37°C in birds (see Materials and methods section). Molecular activity is maximal Na+,K+-ATPase activity divided by the sodium pump density for the same animal. Pi, inorganic phosphate.

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