Alterations in gene expression in T1α null lung: a model of deficient alveolar sac development

BMC Developmental Biology - Tập 6 Số 1 - 2006
Guetchyn Millien1, Avrum Spira1, Anne Hinds1, Junling Wang1, Mary C. Williams1, María I. Ramirez2
1Pulmonary Center, Department of Medicine, Boston University School of Medicine, Boston, MA, USA
2Department of Pathology and Laboratory Medicine, Boston University School of Medicine, Boston, MA, USA

Tóm tắt

Abstract Background Development of lung alveolar sacs of normal structure and size at late gestation is necessary for the gas exchange process that sustains respiration at birth. Mice lacking the lung differentiation gene T1α [T1α(-/-)] fail to form expanded alveolar sacs, resulting in respiratory failure at birth. Since little is known about the molecular pathways driving alveolar sacculation, we used expression microarrays to identify genes altered in the abnormal lungs and, by inference, may play roles in normal lung morphogenesis. Results Altered expression of genes related to cell-cell interaction, such as ephrinA3, are observed in T1α(-/-) at E18.5. At term, FosB, Egr1, MPK-1 and Nur77, which can function as negative regulators of the cell-cycle, are down-regulated. This is consistent with the hyperproliferation of peripheral lung cells in term T1α (-/-) lungs reported earlier. Biochemical assays show that neither PCNA nor p21 are altered at E18.5. At term in contrast, PCNA is increased, and p21 is decreased. Conclusion This global analysis has identified a number of candidate genes that are significantly altered in lungs in which sacculation is abnormal. Many genes identified were not previously associated with lung development and may participate in formation of alveolar sacs prenatally.

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BMC Developmental Biology

Tập 6 Số 1

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