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

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Intra-amniotic endotoxin increases pulmonary surfactant proteins and induces SP-B processing in fetal sheep.

Intra-amniotic (IA) endotoxin induces lung maturation within 6 days in fetal sheep of 125 days gestational age. To determine the early fetal lung response to IA endotoxin, the timing and characteristics of changes in surfactant components were evaluated. Fetal sheep were exposed to 20 mg of Escherichia coli 055:B5 endotoxin by IA injection from 1 to 15 days before preterm delivery at 125 days gestational age. Surfactant protein (SP) A, SP-B, and SP-C mRNAs were maximally induced at 2 days. SP-D mRNA was increased fourfold at 1 day and remained at peak levels for up to 7 days. Bronchoalveolar lavage fluid from control animals contained very little SP-B protein, 75% of which was a partially processed intermediate. The alveolar pool of SP-B was significantly increased between 4 and 7 days in conjunction with conversion to the fully processed active airway peptide. All SPs were significantly elevated in the bronchoalveolar lavage fluid by 7 days. IA endotoxin caused rapid and sustained increases in SP mRNAs that preceded the increase in alveolar saturated phosphatidylcholine processing of SP-B and improved lung compliance in prematurely delivered lambs.[1]

References

  1. Intra-amniotic endotoxin increases pulmonary surfactant proteins and induces SP-B processing in fetal sheep. Bachurski, C.J., Ross, G.F., Ikegami, M., Kramer, B.W., Jobe, A.H. Am. J. Physiol. Lung Cell Mol. Physiol. (2001) [Pubmed]
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