Metabolomics Workbench : NIH Data Repository

MB Sample ID: SA317311

Local Sample ID:	Ctrl_2
Subject ID:	SU003035
Subject Type:	Cultured cells
Subject Species:	Homo sapiens
Taxonomy ID:	9606
Gender:	Male

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Sample Preparation:

Sampleprep ID:	SP003041
Sampleprep Summary:	Extraction of intracellular and extracellular metabolites was performed by a 1:1:1 methanol:water:chloroform extraction protocol. For the extraction of intracellular metabolites, the culture medium was removed and the cells were rinsed twice with 1 ml of 0.9% ice-cold NaCl. The rinsing solution was removed, and the metabolism of the cells was stopped by adding 400 µL of MeOH (-20 °C) followed by 400 µL of ice-cold H2O containing 10 µM d6-glutarate. Cells were collected using a cell lifter and 400 µL of chloroform was added. After shaking at 1,400 rpm and 4 °C for 20 min, the extraction mixture was centrifuged at 18,000 g and 4 °C for 5 min. Subsequently, 300 µL volume of the polar upper phase was collected and evaporated to complete dryness. For the extraction of extracellular metabolites, 300 µL of the supernatant was extracted by adding 400 µL MeOH (-20 °C) containing 100 nM MEHP, 100 µL ice-cold H2O containing 40 µM d6-glutarate, and 400 µL chloroform (-20 °C). Subsequent sample preparation was identical to the extraction of intracellular metabolites. Note: After measurement of the samples by LC-MS, the raw AUC values uploaded here were normalized to the internal standard (d6-glutarate, if applicable) and DNA content per well (measured by DAPI fluorescence). After normalization, log2 fold changes were calculated by dividing the normalized peak area from each replicate of each treatment by the normalized peak area from each control. Insulin data were not normalized to DAPI because fold changes were calculated by dividing the intensities of the insulin-stimulated cells by the noninsulin-stimulated cells from each treatment.

Sampleprep ID:

SP003041

Sampleprep Summary:

Extraction of intracellular and extracellular metabolites was performed by a 1:1:1 methanol:water:chloroform extraction protocol. For the extraction of intracellular metabolites, the culture medium was removed and the cells were rinsed twice with 1 ml of 0.9% ice-cold NaCl. The rinsing solution was removed, and the metabolism of the cells was stopped by adding 400 µL of MeOH (-20 °C) followed by 400 µL of ice-cold H2O containing 10 µM d6-glutarate. Cells were collected using a cell lifter and 400 µL of chloroform was added. After shaking at 1,400 rpm and 4 °C for 20 min, the extraction mixture was centrifuged at 18,000 g and 4 °C for 5 min. Subsequently, 300 µL volume of the polar upper phase was collected and evaporated to complete dryness. For the extraction of extracellular metabolites, 300 µL of the supernatant was extracted by adding 400 µL MeOH (-20 °C) containing 100 nM MEHP, 100 µL ice-cold H2O containing 40 µM d6-glutarate, and 400 µL chloroform (-20 °C). Subsequent sample preparation was identical to the extraction of intracellular metabolites. Note: After measurement of the samples by LC-MS, the raw AUC values uploaded here were normalized to the internal standard (d6-glutarate, if applicable) and DNA content per well (measured by DAPI fluorescence). After normalization, log2 fold changes were calculated by dividing the normalized peak area from each replicate of each treatment by the normalized peak area from each control. Insulin data were not normalized to DAPI because fold changes were calculated by dividing the intensities of the insulin-stimulated cells by the noninsulin-stimulated cells from each treatment.