This competitive renewal application is concerned with the developmental biology of the pulmonary alveolus, specifically focusing on the regulation of differentiation of alveolar type 2 (T2) and type 1 (T1) cells. The differentiation of these cells is crucial to alveolar restructuring associated with lung development, postnatal lung growth and lung repair following injury. During the initial period of this grant we described membrane markers of T2 and T1 cell differentiation and developed several new cell culture systems in which expression of these markers could be studied. We have developed antibodies to several T2 and T1 cell membrane glycoproteins and have established T2 cell and whole lung cDNA expression libraries which we are now using to identify and clone the genes encoding for the differentiation-related proteins. We have developed preliminary data which has allowed us to formulate the hypothesis that is central to the present grant proposal. Alveolar epithelial cell differentiation involves both induction and repression of cell-specific genes. This process is regulated by inducible transcription factors which bind to specific consensus sequences of DNA with this protein-DNA interaction being regulated in part by methylation of the DNA binding sites. The experiments proposed in this renewal application define several genes associated with T2 and T1 cell differentiation, show that they are regulated in the epithelial cell systems which wee have described, and test the hypothesis that transcriptional factors and DNA methylation are important determinants of developmentally-regulated gene expression. In the process we will isolate the DNA-binding proteins that are responsible for inducing expression of the differentiation-related genes. We will also explore the function of the proteins encoded by these genes. The products of this research will be new insights into the control of alveolar epithelial cell differentiation and new information about specialized functions of T2 and T1 cells.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
2R01HL034768-06
Application #
3348074
Study Section
Respiratory and Applied Physiology Study Section (RAP)
Project Start
1985-07-15
Project End
1995-06-30
Budget Start
1990-07-01
Budget End
1991-06-30
Support Year
6
Fiscal Year
1990
Total Cost
Indirect Cost
Name
Boston University
Department
Type
Schools of Medicine
DUNS #
604483045
City
Boston
State
MA
Country
United States
Zip Code
02118
Panchenko, M P; Joyce-Brady, M; Starikova, M G et al. (1998) Atrial natriuretic peptide modulates alveolar type 2 cell adenylyl and guanylyl cyclases and inhibits surfactant secretion. Biochim Biophys Acta 1403:115-25
Cardoso, W V; Itoh, A; Nogawa, H et al. (1997) FGF-1 and FGF-7 induce distinct patterns of growth and differentiation in embryonic lung epithelium. Dev Dyn 208:398-405
Cardoso, W V; Mitsialis, S A; Brody, J S et al. (1996) Retinoic acid alters the expression of pattern-related genes in the developing rat lung. Dev Dyn 207:47-59
Maitre, B; Clement, A; Williams, M C et al. (1995) Expression of insulin-like growth factor receptors 1 and 2 in the developing lung and their relation to epithelial cell differentiation. Am J Respir Cell Mol Biol 13:262-70
Cardoso, W V (1995) Transcription factors and pattern formation in the developing lung. Am J Physiol 269:L429-42
Cardoso, W V; Williams, M C; Mitsialis, S A et al. (1995) Retinoic acid induces changes in the pattern of airway branching and alters epithelial cell differentiation in the developing lung in vitro. Am J Respir Cell Mol Biol 12:464-76
Clement, A; Edeas, M; Chadelat, K et al. (1992) Inhibition of lung epithelial cell proliferation by hyperoxia. Posttranscriptional regulation of proliferation-related genes. J Clin Invest 90:1812-8
Brody, J S; Williams, M C (1992) Pulmonary alveolar epithelial cell differentiation. Annu Rev Physiol 54:351-71
Clement, A; Steele, M P; Brody, J S et al. (1991) SV40T-immortalized lung alveolar epithelial cells display post-transcriptional regulation of proliferation-related genes. Exp Cell Res 196:198-205
Clement, A; Riedel, N; Brody, J S (1990) [3H]thymidine incorporation does not correlate with growth state in cultured alveolar type II cells. Am J Respir Cell Mol Biol 3:159-64

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