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In situ detection of individual transplanted bone marrow cells using FISH on sections of paraffin-embedded whole murine femurs

SK Nilsson, R Hulspas, HU Weier and PJ Quesenberry

Cancer Center, University of Massachusetts Medical Center, Worcester, Massachusetts, USA.

Studies of transplantation biology rely on the detection of donor hemopoietic cells in transplant recipients. Traditionally this has been achieved through ex vivo techniques, including flow cytometric analysis of cell surface markers to detect cells expressing specific epitopes, histochemical detection of cytoplasmic proteins, and the detection of Y chromosome-specific sequences by DNA hybridization. Studies using congenic models, such as the Ly5.1/5.2 mouse, or the utilization of fluorescent dyes, such as PKH-26, have allowed more in-depth analysis of transplantation, beginning to address key issues such as cell homing through cell tracking and elucidation of the "stem cell niche." However, these methods are limited by labeling sensitivity, specificity, crossreactivity and, in the case of PKH-26 labeling, the number of cell divisions the transplanted cells can make before the signal disappears. We have developed a fluorescent in situ hybridization (FISH) technique that utilizes a murine Y chromosome- specific "painting" probe to identify in situ individual transplanted male cells in paraffin-embedded sections of female whole bone marrow while maintaining good morphological integrity. This method is highly sensitive and specific, labeling more than 99% of male cells and no female cells, allowing each transplant to be assessed at the individual cell level. The technique provides unique opportunities to follow the path taken by transplanted cells, both during homing into the marrow and through their maturation and differentiation into mature, functional hemopoietic cells.

Volume 44, Issue 9, pp. 1069-1074, 09/01/1996
Copyright © 1996 by The Histochemical Society


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