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Biosynthesis of Sulfated L-Selectin Ligands in Human High Endothelial Venules (HEV)

  • Jean-Philippe Girard
  • François Amalric
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 435)

Summary

High endothelial venules (HEVs) are specialized post-capillary venules found in lymphoid tissues, that support high levels of lymphocyte extravasation from the blood. Lymphocyte L-selectin plays a key role in the initial interaction of lymphocytes with HEVs by recognizing sulfated carbohydrate ligands on HEV mucin-like glycoproteins, GlyCAM-1, CD34 and MAdCAM-1. Sulfation is key to the uniqueness of the HEV ligands since 6 or 6′sulfated-sLex isoforms have recently been identified as major capping groups of GlyCAM-1 and sulfation of both GlyCAM1 and CD34 has been shown to be required for high-affinity L-selectin binding and recognition by the HEV-specific monoclonal antibody MECA-79. To characterize the molecular mechanisms involved in the biosynthesis of sulfated L-selectin ligands in HEVs, we have started to isolate genes that play a role in sulfate metabolism in HEVs. Studies with chlorate, a selective inhibitor of the synthesis of the high energy donor of sulfate, PAPS (3′-phosphoadénosine 5′-phosphosulfate), had previously revealed that PAPS synthesis is required for sulfation of HEV ligands and recognition by L-selectin. Therefore, we screened an HEV cDNA library in order to isolate cDNAs encoding enzymes involved in PAPS synthesis. This strategy allowed us to isolate a novel cDNA encoding the PAPS synthetase from human HEVs. The molecular characteristics of PAPS synthetase and its role in biosynthesis of sulfated L-selectin ligands in HEVs are discussed.

Keywords

Sulfate Transporter High Endothelial Venule Lymphocyte Migration Lymphocyte Homing Sulfate Incorporation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • Jean-Philippe Girard
    • 1
  • François Amalric
    • 1
  1. 1.Laboratoire de Biologie Moléculaire Eucaryote du CNRSToulouseFrance

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