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Pubmed ID :9853917
Publication Date : //

The Shc 66 and 46 kD isoforms are differentially downregulated at parturition in the fetal mouse lung.


Many of the signaling pathways regulating fetal lung mesenchymal cell proliferation are mediated by the Shc intracellular signaling proteins. Shc is expressed as three isoforms: 52 kD and 46 kD proteins (Shc 52 and Shc 46, respectively) translated from the same mRNA, and a 66 kD form (Shc 66) translated from a separate mRNA. Shc 52 is an activator of Ras and mitogen-activated protein kinase, whereas Shc 66 antagonizes Ras activation. The function of Shc 46 is unclear. We hypothesized that the Shc isoforms are differentially regulated during fetal mouse lung morphogenesis. Relative Shc 66 and Shc 46 protein expression are high until parturition (term = 18.5 d), when a dramatic decrease begins; by postconceptual d 20, relative Shc 66 and Shc 46 expression have fallen by 75 and 69%, respectively. A similar pattern of decreasing Shc 66 mRNA expression in the peripartum period was detected by reverse transcription and competitive polymerase chain reaction during the same period. By isoform-specific immunohistochemistry, Shc 66 is widely distributed in the embryonic lung but becomes restricted to the bronchial smooth muscle and overlying epithelia, periarterial smooth muscle, and the interlobar pleura late in gestation. After parturition, Shc 66 is virtually absent from the lung. All three Shc isoforms are phosphorylated by epidermal growth factor stimulation in fetal lung mesenchymal cells, indicating that Shc 66 is functional in these cells. These data indicate that Shc isoforms are differentially regulated during lung development.

Authors : Lee M K , Zhao J , Smith S M , Tefft J D , Bringas P , Hwang C , Warburton D ,

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