Publication details

CD20 is dispensable for B-cell receptor signaling but is required for proper actin polymerization, adhesion and migration of malignant B cells

Authors

KOZLOVÁ Veronika LEDEREROVÁ Aneta LADUNGOVÁ Adriana PESCHELOVÁ Helena JANOVSKÁ Pavlína SLUSARCZYK A. DOMAGALA J. KOPČIL Pavel VAKULOVÁ Viera OPPELT Jan BRYJA Vítězslav DOUBEK Michael MAYER Jiří POSPÍŠILOVÁ Šárka ŠMÍDA Michal

Year of publication 2020
Type Article in Periodical
Magazine / Source Plos one
MU Faculty or unit

Central European Institute of Technology

Citation
Web https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0229170
Doi http://dx.doi.org/10.1371/journal.pone.0229170
Keywords MONOCLONAL-ANTIBODY; ACTIVATION; EXPRESSION; PYK2; LYMPHOMA; MOLECULE; CHANNEL; ANTIGEN
Description Surface protein CD20 serves as the critical target of immunotherapy in various B-cell malignancies for decades, however its biological function and regulation remain largely elusive. Better understanding of CD20 function may help to design improved rational therapies to prevent development of resistance. Using CRISPR/Cas9 technique, we have abrogated CD20 expression in five different malignant B-cell lines. We show that CD20 deletion has no effect upon B-cell receptor signaling or calcium flux. Also B-cell survival and proliferation is unaffected in the absence of CD20. On the contrary, we found a strong defect in actin cytoskeleton polymerization and, consequently, defective cell adhesion and migration in response to homeostatic chemokines SDF1 alpha, CCL19 and CCL21. Mechanistically, we could identify a reduction in chemokine-triggered PYK2 activation, a calcium-activated signaling protein involved in activation of MAP kinases and cytoskeleton regulation. These cellular defects in consequence result in a severely disturbed homing of B cells in vivo.
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