Abstract:
:T-cell homing to secondary lymphoid tissues generally depends on chemokine-induced firm adhesion in high endothelial venules (HEVs) and is primarily mediated through the CC chemokine receptor 7 (CCR7) on lymphocytes. The CCR7 ligand designated CCL21 is considered the most important trigger because it appears constitutively expressed by murine HEVs. Surprisingly, when we analyzed human tissues, no CCL21 mRNA could be detected in HEVs. In fact, CCL21 mRNA was only expressed in extravascular T-zone cells and lymphatics, whereas immunostaining revealed CCL21 protein within HEVs. This suggests that T-cell recruitment to human lymphoid tissues depends on the transcytosis of lymphoid chemokines through HEV cells because there is at present no evidence of alternative chemokine production in these cells that could explain the attraction of naive T lymphocytes.
journal_name
Bloodjournal_title
Bloodauthors
Carlsen HS,Haraldsen G,Brandtzaeg P,Baekkevold ESdoi
10.1182/blood-2004-11-4353subject
Has Abstractpub_date
2005-07-15 00:00:00pages
444-6issue
2eissn
0006-4971issn
1528-0020pii
2004-11-4353journal_volume
106pub_type
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