Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Kline, D.D. et al.

Defective carotid body function and impaired ventilatory responses to chronic hypoxia in mice partially deficient for hypoxia-inducible factor 1 alpha.

To investigate whether the transcriptional activator hypoxia-inducible factor 1 (HIF-1) is required for ventilatory responses to hypoxia, we analyzed mice that were either wild type or heterozygous for a loss-of-function (knockout) allele at the Hif1a locus, which encodes the O(2)-regulated HIF-1 alpha subunit. Although the ventilatory response to acute hypoxia was not impaired in Hif1a(+/-) mice, the response was primarily mediated via vagal afferents, whereas in wild-type mice, carotid body chemoreceptors played a predominant role. When carotid bodies isolated from wild-type mice were exposed to either cyanide or hypoxia, a marked increase in sinus nerve activity was recorded, whereas carotid bodies from Hif1a(+/-) mice responded to cyanide but not to hypoxia. Histologic analysis revealed no abnormalities of carotid body morphology in Hif1a(+/-) mice. Wild-type mice exposed to hypoxia for 3 days manifested an augmented ventilatory response to a subsequent acute hypoxic challenge. In contrast, prior chronic hypoxia resulted in a diminished ventilatory response to acute hypoxia in Hif1a(+/-) mice. Thus partial HIF-1 alpha deficiency has a dramatic effect on carotid body neural activity and ventilatory adaptation to chronic hypoxia.[1]

References

Defective carotid body function and impaired ventilatory responses to chronic hypoxia in mice partially deficient for hypoxia-inducible factor 1 alpha. Kline, D.D., Peng, Y.J., Manalo, D.J., Semenza, G.L., Prabhakar, N.R. Proc. Natl. Acad. Sci. U.S.A. (2002) [Pubmed]

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