Leukemic cell-microenvironment interaction

The term Leukemic cells via paracrine and contact-dependent mechanisms refers to the complex biological interplay between malignant hematopoietic cells and the bone marrow microenvironment (BMM). This is not a single molecular target but a description of how leukemia cells survive and resist treatment through interactions with stromal cells, extracellular matrix components, and soluble factors (Duarte et al., 2018, Nature). Paracrine mechanisms involve the secretion of cytokines and chemokines, such as CXCL12 and IL-6, which promote leukemic cell homing, survival, and proliferation (Burger & Kipps, 2006, Blood). Contact-dependent mechanisms are mediated by adhesion molecules like VLA-4 (integrin alpha-4/beta-1) and E-selectin, which physically tether leukemic cells to the niche, activating anti-apoptotic pathways and inducing cell adhesion-mediated drug resistance (CAM-DR) (Matsunaga et al., 2003, Nature Medicine). Therapeutic strategies targeting these interactions, such as CXCR4 antagonists or E-selectin inhibitors, aim to de-niche leukemic cells, forcing them into the peripheral blood where they are more vulnerable to cytotoxic agents (Lane et al., 2014, Blood).

Other names

Leukemia niche interactionBone marrow microenvironment-mediated resistanceLeukemic cell-stroma interactionCell adhesion-mediated drug resistance (CAM-DR)

Disruption of the protective bone marrow niche to mobilize leukemic cells into the peripheral circulation, thereby increasing their sensitivity to chemotherapy.