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Review

VLA-4 Expression and Activation in B Cell Malignancies: Functional and Clinical Aspects

1
Department of Internal Medicine I, Medical Center and Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
2
Clinical and Experimental Onco-Hematology Unit, Centro di Riferimento Oncologico di Aviano (CRO) IRCCS, 33081 Aviano, Italy
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(6), 2206; https://doi.org/10.3390/ijms21062206
Received: 14 February 2020 / Revised: 18 March 2020 / Accepted: 20 March 2020 / Published: 23 March 2020
Lineage commitment and differentiation of hematopoietic cells takes place in well-defined microenvironmental surroundings. Communication with other cell types is a vital prerequisite for the normal functions of the immune system, while disturbances in this communication support the development and progression of neoplastic disease. Integrins such as the integrin very late antigen-4 (VLA-4; CD49d/CD29) control the localization of healthy as well as malignant B cells within the tissue, and thus determine the patterns of organ infiltration. Malignant B cells retain some key characteristics of their normal counterparts, with B cell receptor (BCR) signaling and integrin-mediated adhesion being essential mediators of tumor cell homing, survival and proliferation. It is thus not surprising that targeting the BCR pathway using small molecule inhibitors has proved highly effective in the treatment of B cell malignancies. Attenuation of BCR-dependent lymphoma–microenvironment interactions was, in this regard, described as a main mechanism critically contributing to the efficacy of these agents. Here, we review the contribution of VLA-4 to normal B cell differentiation on the one hand, and to the pathophysiology of B cell malignancies on the other hand. We describe its impact as a prognostic marker, its interplay with BCR signaling and its predictive role for novel BCR-targeting therapies, in chronic lymphocytic leukemia and beyond. View Full-Text
Keywords: lymphoma; leukemia; tumor microenvironment; integrin; B cell differentiation; adhesion; B cell receptor; therapy; Bruton’s tyrosine kinase; CD49d; chronic lymphocytic leukemia; CLL lymphoma; leukemia; tumor microenvironment; integrin; B cell differentiation; adhesion; B cell receptor; therapy; Bruton’s tyrosine kinase; CD49d; chronic lymphocytic leukemia; CLL
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MDPI and ACS Style

Härzschel, A.; Zucchetto, A.; Gattei, V.; Hartmann, T.N. VLA-4 Expression and Activation in B Cell Malignancies: Functional and Clinical Aspects. Int. J. Mol. Sci. 2020, 21, 2206. https://doi.org/10.3390/ijms21062206

AMA Style

Härzschel A, Zucchetto A, Gattei V, Hartmann TN. VLA-4 Expression and Activation in B Cell Malignancies: Functional and Clinical Aspects. International Journal of Molecular Sciences. 2020; 21(6):2206. https://doi.org/10.3390/ijms21062206

Chicago/Turabian Style

Härzschel, Andrea; Zucchetto, Antonella; Gattei, Valter; Hartmann, Tanja N. 2020. "VLA-4 Expression and Activation in B Cell Malignancies: Functional and Clinical Aspects" Int. J. Mol. Sci. 21, no. 6: 2206. https://doi.org/10.3390/ijms21062206

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