Determining the macropinocytic index of cells through a quantitative image-based assay.
Determining the macropinocytic index of cells through a quantitative image-based assay.
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DOI:
10.1038/nprot.2014.004
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发表时间:
2014-01
期刊:
影响因子:
14.8
通讯作者:
中科院分区:
文献类型:
--
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Macropinocytosis serves as an internalization pathway for extracellular fluid and its contents and is upregulated in oncogene-expressing cells. Recently, we have revealed a functional role for macropinocytosis in fueling cancer cell growth through the internalization of extracellular albumin, which is degraded into a usable source of intracellular amino acids. Assessing macropinocytosis has been challenging in the past due to the lack of reliable assays capable of quantitatively measuring this uptake mechanism. Here, we describe a protocol for visualizing and quantifying the extent of macropinocytosis in cancer cells both in culture and in vivo. Using this approach, the ‘Macropinocytic Index’ of a particular cancer cell line or subcutaneous tumor can be ascertained within 1–2 days. The protocol can be carried out with multiple samples in parallel and can be easily adapted for a variety of cell types and xenograft/allograft mouse models.
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