Functional correlates of Na+,K+-ATPase in lean and obese (ob/ob) mice.

Functional correlates of Na+,K+-ATPase in lean and obese (ob/ob) mice.
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瘦小鼠和肥胖小鼠 (ob/ob) 中 Na,K -ATP 酶的功能相关性。

DOI:
10.1016/0026-0495(81)90176-1
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发表时间:
1981
期刊:
Metabolism: clinical and experimental
影响因子:
--
通讯作者:
Leveille,GA
Leveille,GA
中科院分区:
--
文献类型:
--
作者:
Lin,MH;Romsos,DR;Akera,T;Leveille,GA

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成年肥胖小鼠骨骼肌和肝脏中Na+,K+-ATP酶单位浓度低于瘦小鼠。本研究旨在提供ob ob小鼠Na ~+,K ~+-ATP酶功能相关性的信息。肥胖小鼠肌肉和肝脏中的钾(K+)含量较低,肌肉中的钠(Na+)含量较高。计算的肥胖小鼠肌肉中的细胞内Na+ K+比率大约是瘦小鼠肌肉中的两倍。在维持在14°、25°或33° 40分钟并注射0.3或0.9 μg哇巴因/g体重的小鼠中测量氧消耗。哇巴因是Na+,K+-ATP酶的特异性抑制剂,对肥胖小鼠的耗氧量的降低(12%-25%)低于瘦小鼠(19%-38%)。这些结果表明,Na+泵活性可能会降低肥胖小鼠。
Abstract Concentrations of Na+, K+-ATPase enzyme units are lower in skeletal muscle and liver of adult obese (ob ob) mice than in their lean counterparts. The present studies were designed to provide information on functional correlates of Na+, K+-ATPase in ob ob mice. Obese mice had lower potassium (K+) content in muscle and liver and higher sodium (Na+) content in muscle than lean counterparts. The calculated intracellular Na+ K+ ratio in muscle of obese mice was approximately twice as high as in muscle of lean mice. Oxygen consumption was measured in mice maintained at 14°, 25°, or 33° for 40 min and injected with 0.3 or 0.9 μg ouabain per g body weight. Ouabain, a specific inhibitor of Na+, K+-ATPase, decreased oxygen consumption less in obese mice (12%–25%) than in lean mice (19%–38%). These results suggest that Na+ pump activity may be reduced in obese mice.
DOI: 10.1172/jci108288
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