Abstract：
:In studies of the ontogeny of fibroblast-epithelial interactions during late fetal lung rat lung development, we have identified two subpopulations of fibroblasts which differed in their ability to promote epithelial cell proliferation or differentiation. As glycosaminoglycans (GAGs) have been implicated in the regulation of these processes we have tested whether the two fibroblast populations synthesize different GAGs and whether the GAG pattern changes with development. Fibroblasts incorporate more [3H]glucosamine and Na2 35SO4 into GAGs than epithelial cells. Both cell types deposited a significant amount of newly synthesized GAGs in the cell-matrix layer. GAGs were lost faster from the cell-matrix layer of fibroblasts (t1/2 = 12 h) than from that of epithelial cells (t1/2 = 48 h). Total GAG synthesis by fibroblasts did not change with advancing gestation, but synthesis of sulfated GAGs by epithelial cells declined with advancing gestation. Independent of gestational age epithelial cells synthesized predominantly heparan sulfate. Depending on their proximity to the epithelium, fibroblasts differed in their production of GAGs. Fibroblasts in close proximity to the epithelium mainly produced and secreted hyaluronan. More distant fibroblasts, from the pseudoglandular stage of lung development synthesized primarily heparan sulfate and chondroitin sulfate. This same population of fibroblasts from the canalicular stage of lung development, produced more hyaluronan. As the shift to hyaluronan occurs with the thinning of the alveolar septal wall, this finding suggests that developmentally regulated GAG production by fibroblasts may facilitate epithelial-fibroblast interaction, thus influencing fetal lung growth and differentiation.
journal_name
Exp Cell Resjournal_title
Experimental cell researchauthors
Caniggia I,Tanswell K,Post Mdoi
10.1016/0014-4827(92)90072-gkeywords:
subject
Has Abstractpub_date
1992-10-01 00:00:00pages
252-8issue
2eissn
0014-4827issn
1090-2422pii
0014-4827(92)90072-Gjournal_volume
202pub_type
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