Characterisation of the ventilatory response to hypoxia in a model of transgenic anemic mice

被引:10
|
作者
Macarlupú, JL
Buvry, A
Morel, OE
León-Valarde, F
Richalet, JP
Favret, F [1 ]
机构
[1] Univ Paris 13, Lab Reponses Cellulaires & Fonct Hypoxie, EA 2363, Bobigny, France
[2] Univ Peruana Cayetano Heredia, Dept Ciencias Biol & Fisiol, Lab Transporte Oxigeno IIA, Lima 100, Peru
关键词
transgenic mice; anemia; hypoxic ventilatory response; oxygen consumption;
D O I
10.1016/j.resp.2005.03.011
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
Both polycythemia and the increase in hypoxic ventilatory response (HVR) are considered as important factors of acclimatization to hypoxia. The objective of this study was to characterise the ventilation pattern at different inspired oxygen fraction in a model of chronic anemic mice. These mice have a targeted disruption in the 5' untranslated region of the Epo gene that reduces Epo expression such that the homozygous animal is severely anemic. Ventilation in normoxia in Epo-TAgh mice was significantly greater than in wild type, and the difference was mainly due to a higher tidal volume. HVR was higher in Epo-TAgh mice at every FIO2 suggesting a higher chemosensitivity. Resting oxygen consumption was maintained in anemic mice. Maximal oxygen consumption was 30% lower while hemoglobin was 60% lower in anemic mice compared to wild type. This small decrease in maximal oxygen consumption is probably due a greater cardiac output and/or a better tissue oxygen extraction and would allow these anemic mice to acclimatize to hypoxia in spite of low oxygen carrying capacity. In conclusion, Epo-TAgh anemic mice showed increased ventilation and hypoxic ventilatory response. However, whether these adaptations will contribute to acclimatization in chronic hypoxia remains to be determined. (C) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:19 / 26
页数:8
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