B-cell lymphoma cell lines and primary malignant B cells from patients with chronic lymphocytic leukemia and marginal zone B cell lymphoma also underwent integrin-mediated firm adhesion involving ICAM-1 and/or VCAM-1 and demonstrated ICAM-1-dependent shape-change and crawling behavior. Unlike primary lymphocytes, the malignant

cells did not undergo transendothelial migration, which could explain why lymphomas are frequently characterized by the intravascular accumulation of malignant cells in the hepatic sinusoids. Conclusion: Our findings demonstrate that distinct combinations of signals promote B-cell recruitment to the liver, suggesting the possibility of novel targets to modulate liver inflammation in disease. Regorafenib Certain features of lymphocyte homing are maintained

in lymphoma recruitment to the liver, suggesting that therapeutic GW572016 targets for lymphocyte recruitment may also prevent hepatic lymphoma dissemination. (HEPATOLOGY 2012) The liver is a unique environment for lymphocyte recruitment, which occurs within the low-shear environment of the hepatic sinusoids mediated by interactions with hepatic sinusoidal endothelial cells (HSECs).1, 2 Leukocytes entering from the blood through the sinusoids undergo sequential adhesive interactions with HSECs, but these differ in important respects when compared to the classical endothelial adhesion cascade. In particular, classical rolling adhesion is not observed and the initial tethering step is brief and selectin independent. In addition to integrin- and chemokine-mediated steps common to all vascular beds, nonclassical adhesion molecules have been reported to be involved in the hepatic sinusoids. These include vascular adhesion protein-1 (VAP-1) and the

common lymphatic endothelial and vascular endothelial receptor-1 (CLEVER-1)/stabilin-1.1, 3, 4 To date, the molecular basis of B-cell recruitment to the Megestrol Acetate liver is unknown, and most studies have focussed on T cells.3, 5-7 Here, we report that human B cells can be captured from flow by HSECs and that they use a distinct combination of endothelial adhesion molecules to adhere to and migrate through HSECs under flow. A large proportion of liver-infiltrating lymphomas are B cell in origin,8, 9 and this led us to compare the behavior of primary B cells with malignant B cells. The patterns of lymphoma infiltration within the liver can be broadly divided into nodular, portal, and sinusoidal, and hepatic involvement is an important part of staging, being associated with poor prognostic markers and “B” symptoms.8, 10 Homing mechanisms must contribute to these hepatic lymphomas, because the majority arise as a consequence of dissemination from a primary site and malignant B cells maintain their ability to traffic.