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Journal of Histochemistry and Cytochemistry, Vol. 49, 821-832, July 2001, Copyright © 2001, The Histochemical Society, Inc.

ARTICLE

Advances in Cytochemical Methods for Detection of Apoptosis

Katherine L. Barretta, Jonathan M. Willinghama, A. Julian Garvina, and Mark C. Willinghama
a Department of Pathology, Wake Forest University School of Medicine, Winston–Salem, North Carolina

Correspondence to: Mark C. Willingham, Dept. of Pathology, Wake Forest Univ. School of Medicine, Gray Bldg., Room 2106, Medical Center Blvd., Winston–Salem, NC 27157. E-mail: mwilling@wfubmc.edu

In an earlier article from this laboratory, the current methods developed to detect apoptosis in cells and tissues were highlighted, along with the challenges in their interpretation. Recent discoveries concerning the underlying biochemical mechanisms of apoptotic effector pathways have made possible further assays that allow a more direct measure of the activation of the apoptotic machinery in cells. This article summarizes some of these newer methods and extends the interpretation of the more classical assays of apoptosis in a defined cell system. We present data in KB and PC3 cell model culture systems induced to undergo apoptosis by the plant toxin ricin. Using a modified in situ nick translation assay (ISNT) with either Bodipy or BUdR labeling, we confirm that most cells showing altered nuclear morphology do not show reactivity with this assay until very late in the apoptotic process. We also show that only a minority of cells label with fluorescent annexin V during apoptosis but that apoptotic cells continue to internalize material from the cell surface through endocytosis after becoming reactive with annexin V. In addition, we describe the utility of a prototype of new assays for caspase substrate cleavage products, the detection of cleaved cytokeratin 18. It is these newer cleavage product assays that perhaps hold the greatest promise for specific detection of apoptosis in cells either in cell culture or in intact tissues. (J Histochem Cytochem 49:821–832, 2001)

Key Words: apoptosis, cytochemistry, TUNEL, ISNT, annexin V, caspases, ricin


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