Summary of Study ST001816

This data is available at the NIH Common Fund's National Metabolomics Data Repository (NMDR) website, the Metabolomics Workbench, https://www.metabolomicsworkbench.org, where it has been assigned Project ID PR001149. The data can be accessed directly via it's Project DOI: 10.21228/M8611G This work is supported by NIH grant, U2C- DK119886.

See: https://www.metabolomicsworkbench.org/about/howtocite.php

This study contains a large results data set and is not available in the mwTab file. It is only available for download via FTP as data file(s) here.

Study ID	ST001816
Study Title	Quantification of PIPs species in mouse tissues.
Study Summary	Phosphoinositides (PIPs) species, differing in phosphorylation at hydroxyls of the inositol head group, play roles in various cellular events. Here we developed a supercritical fluid chromatography-mass spectrometry (SFC-MS) method that allows us to quantify molecular species of all seven PIP regioisomers in culture cells and tissues. Using this methodology, we quantified PIPs species in 13 mouse tissues.
Institute	Grad Sch of Pharmaceut Sci, Univ of Tokyo
Last Name	Kono
First Name	Nozomu
Address	Hongo 7-3-1,, Bunyo-ku, Tokyo, 113-0033, Japan
Email	nozomu@mol.f.u-tokyo.ac.jp
Phone	+81-3-5841-4723
Submit Date	2021-06-01
Raw Data Available	Yes
Raw Data File Type(s)	mzML
Analysis Type Detail	LC-MS
Release Date	2022-05-04
Release Version	1

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Sample Preparation:

Sampleprep ID:	SP001899
Sampleprep Summary:	The following solutions were prepared for lipid extractions; the quench mixture comprising 484 ml MeOH, 242 ml CHCl3, and 23.55 ml 1 M HCl; the pre-derivatization wash composed of 240 ml CHCl3, 120 ml MeOH and 90 ml 0.01 M HCl; and the post-derivatization wash made up of 240 ml CHCl3, 120 ml MeOH, and 90 ml H2O. Wash mixtures were shaken and allowed to separate into two phases. For pre/post-derivatization wash, the upper phase of each solution was used. Frozen tissues were ground into powder in liquid N2 using a pestle and mortar. Frozen tissues were collected into a safe-lock poly-propylene tube (2 ml), and resuspended with 750 μl of quench mix, 170 μl of H2O and internal standards [10 μl containing 2 ng 12:0/13:0 PI, 17:0/20:4 PI (4)P, 17:0/20:4 PI (4,5)P2 and 17:0/20:4 PI (3,4,5)P3], followed by vortex-mixing and lipid extraction. Lipid extraction was performed, based on procedures described by J Clark et al. The single-phase sample (a mixture of 170 μl of an aqueous sample, 2 ng of internal standards, and 750 μl of quench mix) were mixed with 725 μl of CHCl3 and 170 μl of 2M HCl, followed by vortex-mixing and centrifugation (15,000 g, 5 min at room temperature). The lower organic phase was collected into a fresh safe-lock poly-propylene tube (2 ml) and mixed with 708 μl of prederivatization wash, followed by vortex-mixing and centrifugation (15,000 g, 3 min at room temperature). The lower phase was collected into another fresh tube and subjected to derivatization. Derivatization of lipids was performed in a fume hood with adequate personal safety equipment as follows, based on procedures described by J Clark et al7. Fifty μl trimethylsilyl diazomethane in hexane (2 M solution; Sigma-Aldrich) was added to the lipid extracts (~1 ml), and after leaving to stand 10 min at room temperature, the reaction was quenched with 6 μl of acetic acid. Next, 700 μl post-derivatization wash solution was added to the mixture, followed by centrifugation (1,500 g, 3 min). The resultant lower phase was collected and rewashed with a 700 μl post-derivatization wash solution. Then 90 μl of MeOH and 10 μl of H2O were added to the final collected lower phase. The samples were dried up with a centrifugal evaporator. Finally, samples were dissolved in 80μl MeOH, sonicated briefly, and 20 μl H2O was added. To avoid degradation, the samples were stored at -80ºC until use.

Sampleprep ID:

SP001899

Sampleprep Summary:

The following solutions were prepared for lipid extractions; the quench mixture comprising 484 ml MeOH, 242 ml CHCl3, and 23.55 ml 1 M HCl; the pre-derivatization wash composed of 240 ml CHCl3, 120 ml MeOH and 90 ml 0.01 M HCl; and the post-derivatization wash made up of 240 ml CHCl3, 120 ml MeOH, and 90 ml H2O. Wash mixtures were shaken and allowed to separate into two phases. For pre/post-derivatization wash, the upper phase of each solution was used. Frozen tissues were ground into powder in liquid N2 using a pestle and mortar. Frozen tissues were collected into a safe-lock poly-propylene tube (2 ml), and resuspended with 750 μl of quench mix, 170 μl of H2O and internal standards [10 μl containing 2 ng 12:0/13:0 PI, 17:0/20:4 PI (4)P, 17:0/20:4 PI (4,5)P2 and 17:0/20:4 PI (3,4,5)P3], followed by vortex-mixing and lipid extraction. Lipid extraction was performed, based on procedures described by J Clark et al. The single-phase sample (a mixture of 170 μl of an aqueous sample, 2 ng of internal standards, and 750 μl of quench mix) were mixed with 725 μl of CHCl3 and 170 μl of 2M HCl, followed by vortex-mixing and centrifugation (15,000 g, 5 min at room temperature). The lower organic phase was collected into a fresh safe-lock poly-propylene tube (2 ml) and mixed with 708 μl of prederivatization wash, followed by vortex-mixing and centrifugation (15,000 g, 3 min at room temperature). The lower phase was collected into another fresh tube and subjected to derivatization. Derivatization of lipids was performed in a fume hood with adequate personal safety equipment as follows, based on procedures described by J Clark et al7. Fifty μl trimethylsilyl diazomethane in hexane (2 M solution; Sigma-Aldrich) was added to the lipid extracts (~1 ml), and after leaving to stand 10 min at room temperature, the reaction was quenched with 6 μl of acetic acid. Next, 700 μl post-derivatization wash solution was added to the mixture, followed by centrifugation (1,500 g, 3 min). The resultant lower phase was collected and rewashed with a 700 μl post-derivatization wash solution. Then 90 μl of MeOH and 10 μl of H2O were added to the final collected lower phase. The samples were dried up with a centrifugal evaporator. Finally, samples were dissolved in 80μl MeOH, sonicated briefly, and 20 μl H2O was added. To avoid degradation, the samples were stored at -80ºC until use.