Comprehensive analysis of lymph node stroma-expressed Ig superfamily members reveals redundant and nonredundant roles for ICAM-1, ICAM-2, and VCAM-1 in …

RT Boscacci, F Pfeiffer, K Gollmer… - Blood, The Journal …, 2010 - ashpublications.org
RT Boscacci, F Pfeiffer, K Gollmer, AIC Sevilla, AM Martin, SF Soriano, D Natale…
Blood, The Journal of the American Society of Hematology, 2010ashpublications.org
Although it is well established that stromal intercellular adhesion molecule-1 (ICAM-1), ICAM-
2, and vascular cell adhesion molecule-1 (VCAM-1) mediate lymphocyte recruitment into
peripheral lymph nodes (PLNs), their precise contributions to the individual steps of the
lymphocyte homing cascade are not known. Here, we provide in vivo evidence for a
selective function for ICAM-1> ICAM-2> VCAM-1 in lymphocyte arrest within noninflamed
PLN microvessels. Blocking all 3 CAMs completely inhibited lymphocyte adhesion within …
Abstract
Although it is well established that stromal intercellular adhesion molecule-1 (ICAM-1), ICAM-2, and vascular cell adhesion molecule-1 (VCAM-1) mediate lymphocyte recruitment into peripheral lymph nodes (PLNs), their precise contributions to the individual steps of the lymphocyte homing cascade are not known. Here, we provide in vivo evidence for a selective function for ICAM-1 > ICAM-2 > VCAM-1 in lymphocyte arrest within noninflamed PLN microvessels. Blocking all 3 CAMs completely inhibited lymphocyte adhesion within PLN high endothelial venules (HEVs). Postarrest extravasation of T cells was a 3-step process, with optional ICAM-1–dependent intraluminal crawling followed by rapid ICAM-1– or ICAM-2–independent diapedesis and perivascular trapping. Parenchymal motility of lymphocytes was modestly reduced in the absence of ICAM-1, while ICAM-2 and α4-integrin ligands were not required for B-cell motility within follicles. Our findings highlight nonredundant functions for stromal Ig family CAMs in shear-resistant lymphocyte adhesion in steady-state HEVs, a unique role for ICAM-1 in intraluminal lymphocyte crawling but redundant roles for ICAM-1 and ICAM-2 in lymphocyte diapedesis and interstitial motility.
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