title: DNA microarray reveals novel genes induced by mechanical forces in fetal lung type II epithelial cells.
abstract: Mechanical forces are essential for normal fetal lung development. However, the cellular and molecular mechanisms regulating this process are still poorly defined. In this study, we used oligonucleotide microarrays to investigate gene expression in cultured embryonic d 19 rat fetal lung type II epithelial cells exposed to a level of mechanical strain similar to the developing lung. Significance Analysis of Microarrays (SAM) identified 92 genes differentially expressed by strain. Interestingly, several members of the solute carrier family of amino acid transporter (Slc7a1, Slc7a3, Slc6a9, and tumor-associated protein 1) genes involved in amino acid synthesis (Phgdh, Psat1, Psph, Cars, and Asns), as well as the amiloride-sensitive epithelial sodium channel gene (Scnn1a) were up-regulated by the application of force. These results were confirmed by quantitative real-time PCR (qRT-PCR). Thus, this study identifies genes induced by strain that may be important for amino acid signaling pathways and protein synthesis in fetal type II cells. In addition, these data suggest that mechanical forces may contribute to facilitate lung fluid reabsorption in preparation for birth. Taken together, the present investigation provides further insights into how mechanical forces may modulate fetal lung development.
authors.affiliation: Department of Pediatrics, Division of Neonatology, Women & Infants Hospital of Rhode Island, Providence, RI 02905, USA.
authors.forename: Yulian
authors.initials: Y
authors.lastname: Wang
authors.forename: Benjamin S
authors.initials: BS
authors.lastname: Maciejewski
authors.forename: Gaia
authors.initials: G
authors.lastname: Weissmann
authors.forename: Ophira
authors.initials: O
authors.lastname: Silbert
authors.forename: Hillary
authors.initials: H
authors.lastname: Han
authors.forename: Juan
authors.initials: J
authors.lastname: Sanchez-Esteban
mesh_terms: D000596:Amino Acids / Q000378:metabolism; D000818:Animals; D001692:Biological Transport / Q000235:genetics; D002462:Cell Membrane; D004847:Epithelial Cells / Q000378:metabolism; D047109:Fetal Development / Q000235:genetics*; D005333:Fetus / Q000378:metabolism; D015870:Gene Expression; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D008168:Lung / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism; D020411:Oligonucleotide Array Sequence Analysis; D051381:Rats; D017207:Rats, Sprague-Dawley; D012964:Sodium / Q000378:metabolism; D013314:Stress, Mechanical
chemical_list: D000596:Amino Acids; D012964:Sodium