Chronic Lymphocytic Leukemia Cells With Trisomy 12 Home To The Bone Marrow In a CXCR4-Independent Manner and Are Prone To Proliferate In Vitro (original) (raw)
Blood
Abstract
Trisomy 12 (tri12) is a frequent chromosomal aberration in chronic lymphocytic leukemia (CLL) associated with atypical cell morphology, high in vivo tumor proliferation activity and a predisposition to Richter’s transformation. Tri12 harboring CLL cells express increased levels of the negative prognostic marker CD49d, the α4 subunit of the integrin very late antigen 4 (VLA-4), which we previously identified as a key regulator of CLL cell homing to bone marrow (BM). During this process, inside-out activation of VLA-4 upon CXCR4 binding to endothelially displayed CXCL12 is thought to upregulate the adhesive properties of VLA-4 and augment the arrest of CLL cells on the VCAM-1 presenting vessels. Here, we investigated the functional interplay of VLA-4 and CXCR4 in CLL carrying tri12. We first found that the upregulation of CD49d expression in this subset (MFIR CD49d 9.8±5.3 (n=22) vs. 2.7±3.9 (n=126), p<0.0001) was paralleled by their reduced CXCR4 expression (MFIR CXCR4 11.8±7.2 (n...
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