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The fleet feet of haematopoietic stem cells: rapid motility, interaction and proteopodia
Author(s) -
Frimberger Angela E.,
McAuliffe Christina I.,
Werme Kimberly A.,
Tuft Richard A.,
Fogarty Kevin E.,
Benoit Brian O.,
Dooner Mark S.,
Quesenberry Peter J.
Publication year - 2001
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1046/j.1365-2141.2001.02542.x
Subject(s) - haematopoiesis , homing (biology) , microbiology and biotechnology , stem cell , stromal cell , biology , motility , in vivo , cancer research , genetics , ecology
Haematopoietic stem cells (HSCs) have been extensively characterized regarding in vivo engraftment, surface epitopes and genetic regulation. However, little is known about the homing of these rare cells, and their intrinsic motility and membrane deformation capacity. We used high‐speed optical‐sectioning microscopy and inverted fluorescent videomicroscopy to study highly purified murine lineage‐negative, rhodamine‐low, Hoechst‐low HSCs over time under various in vitro conditions. We discovered extremely rapid motility, directed migration to stromal cells and marked membrane modulation. High resolution images with three‐dimensional reconstruction showed the general presence of microspikes. Further, pseudopodia (proteopodia) were observed that were induced by stromal‐derived factor‐1 and steel factor. Proteopodia were directed towards and were quenched by stromal cells, at times bridged HSCs, and could rapidly retract or detach from cells. Proteopodia were also observed in vivo with homed HSCs in frozen sections of murine spleen, lung and heart. This is the first demonstration that HSCs are both fast and highly malleable in phenotype.