Nitric oxide inhibition decreases bleomycin‐detectable iron in spleen, bone marrow cells and heart but not in liver in exercise rats

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• 作者：Xiao ; De Sheng ; Ho ; Kwok Ping ; Qian ; Zhong Ming
• 关键词：nitrite and nitrate (NOx) ; nitric oxide (NO) ; bleomycin ; detectable iron (BDI) ; non ; heme iron (NHI) ; L ; NAME ; exercise
• 刊名：Molecular and Cellular Biochemistry
• 出版年：2004
• 出版时间：2004
• 年：2004
• 卷：260
• 期：1
• 页码：31-37
• 全文大小：103 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Biochemistry
  Medical Biochemistry
  Oncology
  Cardiology
  
• 出版者：Springer Netherlands
• ISSN：1573-4919

文摘

The possible role of nitric oxide on the exercise‐induced changes in bleomycin‐detectable iron (BDI) in the liver, spleen, bone marrow cells and heart was investigated. Female Sprague–Dawley rats were randomly assigned to four groups: S1 (Sedentary), S2 (Sedentary + L‐NAME [N‐nitro‐L‐arginine methyl ester]), E1 (Exercise) and E2 (Exercise + L‐NAME). Animals in the E1 and E2 swam for 2 h/day for 3 months. L‐NAME in the drinking water (1 mg/ml) was administrated to rats in the S2 and E2 groups for the same period. At the end of the 3rd month, nitrite and nitrate (NOx), BDI and non‐heme iron (NHI) contents in the liver, spleen, bone marrow cells and heart were measured. The ratio of BDI/NHI was calculated. The exercise induced a significant increase in NOx and BDI contents and/or BDI/NHI ratio in the spleen, bone morrow cells and heart. Treatment with L‐NAME, an inhibitor of NOS, led to a significant decrease in NOx and an increase in BDI levels and BDI/NHI ratios in these tissues. The correlative analysis showed that there is significantly positive correlation between NOx levels and BDI contents and/or BDI/NHI ratios in the spleen, bone marrow cells and heart. These results suggest that the increased nitric oxide might be one of the reasons leading to the increased BDI levels in these tissues in the exercised rats. In contrast to the above tissues, in the liver, exercise led to a significant decrease rather than increase in BDI levels and BDI/NHI ratios with a significant increase in NOx contents. Treatment with L‐NAME led to a significant increase in BDI levels and BDI/NHI ratios and a decrease in NOx contents in the tissue. These findings plus the results reported by others imply that nitric oxide might have an inhibitory effect on BDI in the liver.