Is there a glycosaminoglycan-related heterogeneity of the thymic epithelium?

Abstract:

:We determined the synthesis and secretion of glycosaminoglycans by three distinct preparations of mouse cultured thymic epithelial cells. These comprised primary cultures of thymic nurse cells (TNCs), which are normally located within the cortex of the thymic lobules, as well as two murine thymic epithelial cells, bearing a mixed, yet distinct, cortico-medullary phenotype. We first identified and measured the relative proportions of the various glycosaminoglycans in the three epithelial cells. Non-sulfated glycosaminoglycans are preponderantly secreted by the TNCs, while the sulfated glycans (particularly heparan sulfate) are relatively more abundant on the cell surface. The three types of epithelial cells differ markedly in their heparan sulfate composition, mainly due to different patterns of N- and O-sulfation. In addition, the cells differ in the synthesis and secretion of other glycosaminoglycans. Thus, TNCs secrete high amounts of dermatan sulfate + chondroitin sulfate to the culture medium. IT-76M1 cells secrete high proportions of heparan sulfate while 2BH4 cells show a more equilibrated proportion of dermatan sulfate/chondroitin sulfate and heparan sulfate. The three epithelial cells also differ in their capacity to produce hyaluronic acid and 2BH4 cells are distinguished by their high rate of synthesis of this glycosaminoglycan. In conclusion, our results show that distinct thymic epithelial cells can synthesize different types of glycosaminoglycans. Although it remains to be definitely determined whether these differences reflect the in vivo situation, our data provide new clues for further understanding of how glycosaminoglycan-mediated interactions behave in the thymus.

journal_name

J Cell Physiol

authors

Werneck CC,Cruz MS,Silva LC,Villa-Verde DM,Savino W,Mourão PA

doi

10.1002/1097-4652(200010)185:1<68::AID-JCP6>3.0.CO

keywords:

subject

Has Abstract

pub_date

2000-10-01 00:00:00

pages

68-79

issue

1

eissn

0021-9541

issn

1097-4652

pii

10.1002/1097-4652(200010)185:1<68::AID-JCP6>3.0.CO

journal_volume

185

pub_type

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