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Quantitative Analysis of Cellular Diacylglycerol Content
Fikadu G Tafesse1, Karin Strijbis1, Hidde L Ploegh1
1Whitehead Institute, Whitehead Institute of MIT, Cambridge, USA.
Bio-Protocol
|January 31, 2017
Summary
This study details a method to measure diacylglycerol (DAG), a key signaling lipid. The assay quantifies cellular DAG by measuring its conversion to phosphatidic acid using a radiolabeled phosphate group.
Area of Science:
- Biochemistry
- Cell Biology
- Lipid Metabolism
Background:
- Diacylglycerol (DAG) is a crucial bioactive lipid involved in numerous cellular signaling pathways.
- DAG levels fluctuate transiently in cell membranes following stimulation, activating downstream processes via protein interactions, notably with protein kinase C.
- DAG kinases play a regulatory role by converting DAG into phosphatidic acid, thereby attenuating cellular responses.
Purpose of the Study:
- To describe a reliable assay for quantifying intracellular diacylglycerol (DAG) levels.
- To provide a detailed protocol for measuring DAG concentrations in cellular samples.
Main Methods:
- The assay utilizes the enzymatic activity of DAG kinase to convert DAG (sn-1,2-diacylglycerol) into phosphatidic acid.
- Incorporation of a radiolabeled phosphate group into phosphatidic acid is measured to quantify the initial DAG amount.
- This method is based on the protocol described by Strijbis et al. (2013).
Main Results:
- The described assay allows for the accurate quantification of cellular diacylglycerol (DAG) levels.
- The protocol provides a sensitive method to assess changes in DAG concentrations under various experimental conditions.
Conclusions:
- This assay serves as a valuable tool for researchers studying lipid signaling and cellular responses.
- Accurate measurement of DAG is essential for understanding its diverse biological roles and the regulation of cellular processes.
