Determination of the number of endothelial cells in culture using an acid phosphatase assay |
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Authors: | D T Connolly M B Knight N K Harakas A J Wittwer J Feder |
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Affiliation: | 1. Departament d’Enginyeries, Universitat de Vic–Universitat central de Catalunya, 08500 Vic, Spain;2. Departament de Matemàtiques, Universitat Politécnica de Catalunya, Manresa 08242, Spain;3. Departament de Matemàtiques, Universitat Autònoma de Barcelona, Bellaterra 08193, Spain;4. Departamento de Matemáticas, ITAM, Río Hondo 1, Col. Progreso Tizapán, Ciudad de México 01080, México |
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Abstract: | A simple assay is described in which small numbers of endothelial cells in culture can be determined by measuring acid phosphatase activity. After removal of the growth medium from cells grown in 96-well culture plates, the cells are lysed in buffer containing the detergent Triton X-100 and the phosphatase substrate p-nitrophenyl phosphate. After 2 h at 37 degrees C, the reaction is stopped with sodium hydroxide, and color development is determined using a rapid multiwell plate reader. The assay detects 100 to 10,000 cells per well. The assay has been used to determine growth curves for endothelial cells in the presence and absence of endothelial cell growth factor from bovine hypothalamus and to monitor fractions during purification of the growth factor. Minor modifications in the assay allow it to be fully automated. |
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