亜硝酸ナトリウム(NaNO_2)のマウス運動機能に及ぼす影響について

概要

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Male mice of ICR-strain (four weeks old) were divided into seven groups, of each five animals. Sodium nitrite (NaNo_2), dissolved in the physiological saline solution, was administered orally at doses of 250, 220, 110, 80, 50 and 5 mg per kg, everyday during successive seven days to each group. The forced running distance was monitored by means of the treadmill (Eiken-model) during the period of the administration and recovery. All the mice which received 250 mg/kg dose died after the single shot. The capability of muscular exercise was found decreased particularly in the groups which received 110 and 80 mg/kg of NaNO_2. Mean methemoglobin level (Met-Hb) in the blood of male mice was about 1.0%. Mean Met-Hb levels were increased to about 1.2% and 3.8% after the oral administration of NaNO_2 at the dose of 110 mg/kg everyday for successive 7 and 21 days, respectively. Met-Hb levels were measured by means of modified Evelyn-Malloy's method. In the groups which received 110 mg/kg or less, no significant changes in the body weight as well as the other physical functions were observed, as compared with those received only physiological saline solutions.
1982-09-20