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Immunohistochemical detection of proliferating cells in vivo
A deFazio, JA Leary, DW Hedley and MH Tattersall
Incorporation of the thymidine analogue 5-bromo-2'-deoxyuridine (BrUdR) into newly synthesized DNA provides the basis of a simple technique for identifying proliferating cells. BrUdR was administered to C57BL/6 mice by continuous infusion for 1-7 days, or by intraperitoneal injection for shorter intervals. Various tissue types, including gut, kidney, and liver, were excised, fixed in neutral buffered formalin, and paraffin- embedded for sectioning. De-paraffinized 4-micron tissue sections and bone marrow samples were incubated with an anti-BrUdR antibody and cells that had traversed S-phase during the BrUdR exposure period were identified immunohistochemically. Proliferation and migration of intestinal epithelial cells were identified by antibody staining after continuous in vivo exposure to BrUdR for 1-4 days, and BrUdR incorporation into proliferating marrow cells was detected within 30 min. Tissues such as normal liver, known to have low levels of proliferation, remained unstained after 3 days' exposure to BrUdR. After we established that normal proliferating cells could be identified using this technique, BrUdR was administered to mice bearing B16 melanomas. Again, proliferating tumor cells were clearly identified in histological sections. The nuclei from these paraffin-embedded tumors were also collected for flow cytometric analysis after de- waxing, rehydration, and pepsin treatment. This combination of techniques made possible the comparison in adjacent tissue sections of labeling index, obtained from stained sections, with percentage S- phase, measured using DNA flow cytometry. The % S-phase was consistently higher than the labeling index obtained with immunocytochemistry, and two-parameter DNA vs BrUdR flow cytometry showed that this difference could be accounted for by a population of unlabeled cells with an S-phase DNA content.
Volume 35,
Issue 5,
pp. 571-577,
05/01/1987
Copyright © 1987 by The Histochemical Society
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