Abstract
Normal haematopoietic cell regulation involves interaction between marrow stromal cells and haematopoietic progenitor cells which may be facilitated by specific recognition and adhesion. Some leukaemogenic events might produce a selective growth advantage by altering this regulatory network, possibly by diminishing the capacities of cells to adhere to stromal elements. Using an in vitro culture system which allows investigation of adhesion to stromal layers and subsequent colony formation by blast colony-forming cells (B1-CFC) in normal marrow and Ph+ chronic myeloid leukaemic (CML) blood, we compared the adhesive properties of normal and malignant progenitor cells. We present evidence that altered adhesive interactions between primitive progenitor cells and marrow stromal cells occur in CML.
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