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Updated: Jan 27, 2026

Purification, Expansion, and Flow Cytometry-Based Phenotyping of Mouse Derived Bone Marrow Mesenchymal Stem Cells
Published on: July 11, 2025
Expression and function of phosphoinositide 3-kinase delta in mesenchymal stromal cells from normal and leukaemic
Ahmed Y Ali1,2, Qingdong Guan3,4,5, Xun Wu1
1Department of Immunology, University of Manitoba, Winnipeg, Canada.
Abstract:
Within lymphoid tissues, chronic lymphocytic leukaemia (CLL) cells interact with mesenchymal stromal cells (MSC). Inhibitors of phosphoinositide 3-kinase delta (PI3Kδ) cause release of CLL cells from lymphoid tissues into blood. PI3Kδ inhibitors are thought to target only CLL and other immune cells because PI3Kδ expression is restricted to haematopoietic cells. We found that PI3Kδ is unexpectedly expressed in primary MSC derived from CLL patients and healthy donors. PI3Kδ inhibition in MSC using idelalisib or duvelisib significantly reduced their ability to support CLL migration and adhesion. These observations provide the first evidence that PI3Kδ is expressed and functional in CLL MSC.
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