Department of Pathology, F. Edward Hebert School of Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD
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Morrison, B., Cutler, M. L. Mouse Mammary Epithelial Cells form Mammospheres During Lactogenic Differentiation. J. Vis. Exp. (32), e1265, doi:10.3791/1265 (2009).
Low power magnification of normal mammary epithelial cell monolayers and multiple mammospheres, as well as high power magnification of a single mammosphere are shown in Figure 1, respectively.
Figure 1. Mammospheres. (a) Normal mammary epithelial cell monolayers should be displayed as a flat layer of confluent cells. (b) After 3-5 days of DIP stimulation multiple mammospheres appear. Photograph taken 5 days post DIP addition. (c) Higher magnification of a single field containing mammospheres at 5 days post DIP addition.
In order for this technique to be successful and of the best quality, the epithelial cells must be maintained at confluence prior to being induced with lactogenic hormones. There may be situations where there are numerous mammospheres, which makes the quantification difficult. Thus, for quantitative purposes it is best to photograph the mammospheres at a time point when the number of mammospheres is able to be counted.
While there are various molecular markers used to determine the degree of lactogenic differentiation of mammary epithelial cells, there are few morphological markers used for cells grown in 2D culture. The ability of epithelial cell monolayers to form miniature dome structures where milk proteins can accumulate provides a mode by which the morphological changes that occur during this developmental process can be monitored.
Funds from Congressionally Directed Medical Research Fund grant (DAMD17-01-0264) to M.L. Cutler and United States Military Cancer Institute to M.L. Cutler supported the work.
|Fetal Bovine Serum||Atlanta Biologicals||S11550|
|L-Glutamine||GIBCO, by Life Technologies||25030|
|PenStrep||GIBCO, by Life Technologies||15140|
|Hepes||Quality Biological, Inc.||118089060|
|Insulin||GIBCO, by Life Technologies||12585-014|
|Digital Camera||QImaging||Retiga 2000RV Fast 1394|