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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

A study of acid phosphatase and dipeptidyl aminopeptidase II in monodispersed anterior pituitary cells using flow cytometry and electron microscopy.

A brief historical review of cytoenzymology is presented from the time of introduction into electron microscopy to the present, where the direction for quantification of an enzyme in single cells appears most promising by fluorescent staining. First attempts are reported to quantitate acid phosphatase (AcPase) and dipeptidyl aminopeptidase II (DAP-II) in monodispersed anterior pituitary cells from lactating and postlactating rats by flow cytometry, fluorescent, and electron microscopy. 3-Hydroxy-flavone is introduced as a new fluorescent cytochemical stain for AcPase, useful in flow cytometry but of only limited use in fluorescent microscopy. Histograms for AcPase indicate a single peak of cells staining more intensely in cell preparations from postlactating over lactating animals. Histograms for DAP-II staining indicate two distinct populations of cells present in the lactating and only one in the postlactating rat anterior pituitary gland. The application of dual laser staining indicates that not all cells stain for both enzymes. Electron microscopy shows the subcellular localization of DAP-II to be limited to lytic bodies and in mammotrophic cells to some secretion granules.[1]


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