Growth of distal fetal rat lung epithelial cells in a defined serum-free medium

1991 ◽  
Vol 27 (8) ◽  
pp. 625-632 ◽  
Author(s):  
D. Jassal ◽  
R. N. N. Han ◽  
I. Caniggia ◽  
M. Post ◽  
A. K. Tanswell
Keyword(s):  
Epithelial Cells ◽  
Lung Epithelial Cells ◽  
Rat Lung ◽  
Serum Free Medium ◽  
Free Medium ◽  
Serum Free ◽  
Fetal Rat ◽  
Lung Epithelial ◽  
Fetal Rat Lung

Sex hormones regulate CFTR in developing fetal rat lung epithelial cells

1997 ◽  
Vol 272 (5) ◽  
pp. L844-L851 ◽  
Author(s):  
N. B. Sweezey ◽  
F. Ghibu ◽  
S. Gagnon
Keyword(s):  
Epithelial Cells ◽  
Sex Hormones ◽  
Functional Activity ◽  
Lung Development ◽  
Fetal Lung ◽  
Lung Epithelial Cells ◽  
Rat Lung ◽  
Fetal Rat ◽  
Lung Epithelial ◽  
Fetal Rat Lung

Sex hormones modulate two normal processes of late-gestation mammalian lung development: the onset of augmented production of surfactant phospholipids and the loss of mesenchymal cells. As prenatal lung development advances, epithelial chloride secretory pathways diminish as opposing sodium absorptive pathways increase in expression. We hypothesized that sex hormones may influence both the gene expression and functional activity of the chloride channel known as the cystic fibrosis transmembrane conductance regulator (CFTR) in fetal lung epithelium. We report here that sex hormones exert opposite effects on CFTR. Androgen increases and estrogen decreases CFTR functional activity [as assessed by CFTR antisense (but not sense) oligodeoxynucleotide-sensitive adenosine 3',5'-cyclic monophosphate-stimulated cell volume reduction or by glibenclamide-sensitive, amiloride-insensitive transepithelial electrical potential] in primary cultures of fetal rat lung epithelial cells. No alterations in CFTR mRNA levels measured by quantitative polymerase chain reaction amplification of reverse transcripts) accompanied either the changes in functional activity induced by sex hormones or the changes observed during normal development, suggesting that sex hormone modulation of CFTR in antenatal lung occurs at a posttranscriptional level. Our data are consistent with the hypothesis that both androgen and estrogen contribute to the male disadvantage with respect to fetal lung functional development.

Molecular cloning of actin filament-associated protein: a putative adaptor in stretch-induced Src activation

2002 ◽  
Vol 283 (2) ◽  
pp. L265-L274 ◽  
Author(s):  
Monika Lodyga ◽  
Xiao-Hui Bai ◽  
Eric Mourgeon ◽  
Bing Han ◽  
Shaf Keshavjee ◽  
...  
Keyword(s):  
Actin Filament ◽  
Protein A ◽  
Mechanical Stretch ◽  
Lung Epithelial Cells ◽  
Rat Lung ◽  
Binding Motifs ◽  
Fetal Rat ◽  
Lung Epithelial ◽  
Fetal Rat Lung ◽  
Novel Model

Mechanical stretch-induced activation of c-Src is an important step for signal transduction of stretch-induced fetal rat lung cell proliferation. This process appears to be mediated through actin filament-associated protein (AFAP), encoded by a gene originally cloned from the chicken. In the present study, we cloned the rat AFAP gene from fetal rat lungs. Its mRNA and protein are differentially expressed among various tissues. The protein is colocalized with actin filaments in fetal rat lung epithelial cells and fibroblasts. Mechanical stretch increased tyrosine phosphorylation of rat AFAP and its binding to c-Src within the initial several minutes. Src SH2 and SH3 binding motifs are highly conserved in the AFAP proteins (from chicken, rat to human). On the basis of the molecular structure of AFAP protein, we speculate that it is an adaptor in mechanical stretch-induced activation of c-Src. A novel model of mechanoreception is proposed.

Human endometrial epithelial cells grown on collagen in serum-free medium. Estrogen responsiveness and morphology

1991 ◽  
Vol 125 (1) ◽  
pp. 101-108 ◽  
Author(s):  
Bertil G. Casslén ◽  
Michael J. K. Harper
Keyword(s):  
Epithelial Cells ◽  
Primary Cultures ◽  
Collagen Matrix ◽  
Human Endometrium ◽  
Serum Free Medium ◽  
Free Medium ◽  
Endometrial Stromal Cells ◽  
Prolonged Incubation ◽  
Serum Free ◽  
Endometrial Epithelial Cells

Abstract. The aim of the study was to explore the possibility of using human endometrial epithelial cells in serum-free culture as a sensitive assay for hormonal effects on the human endometrium. Glands were isolated following enzymatic digestion of the endometrial tissue and plated on a collagen matrix. The epithelial cells were grown in either medium containing serum or in supplemented serum-free medium. No morphologic difference was found between cells grown in these two media for up to 5 days, using either light or scanning electron microscopy. Secretion of prostaglandin F2α (PGF2α) in response to estradiol was not lower in serum-free medium than in medium containing serum for the first 2 days of culture, whereas secretion declined after prolonged incubation in the serum-free medium. This response to estradiol was clearly dose-dependent, and it was further enhanced by addition of arachidonic acid, the precursor for prostaglandin synthesis, to the medium. Co-culture of endometrial stromal cells did not influence the secretion of PGF2α by epithelial cells. We conclude that the secretion of PGF2α from primary cultures of human endometrial epithelial cells grown on collagen in serum-free medium can be used for a limited period as an assay of estrogenic effects on the human endometrium.

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