Summary of Study ST002263

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 PR001445. The data can be accessed directly via it's Project DOI: 10.21228/M8Z119 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	ST002263
Study Title	Intermittent fasting induces rapid hepatocyte proliferation to maintain the hepatostat
Study Summary	Nutrient availability fluctuates in most natural populations, forcing organisms to undergo periods of fasting and re-feeding. It is unknown how dietary change influences liver homeostasis. Here, we show that a switch from ad libitum feeding to intermittent fasting (IF) promotes rapid hepatocyte proliferation. Mechanistically, IF- induced hepatocyte proliferation is driven by the combined action of intestinally produced, systemic endocrine FGF15 and localized WNT signaling. IF proliferation re-establishes a constant liver-to-body-mass ratio during periods of fasting and re-feeding, a process termed the hepatostat. This study provides the first example of dietary influence on adult hepatocyte proliferation, and challenges the widely held view that liver tissue is mostly quiescent unless chemically or mechanically injured.
Institute	Stanford University
Last Name	DeFelice
First Name	Brian
Address	1291 Welch Rd.
Email	bcdefelice@ucdavis.edu
Phone	5303564485
Submit Date	2022-08-01
Raw Data Available	Yes
Raw Data File Type(s)	mzXML, raw(Thermo)
Analysis Type Detail	LC-MS
Release Date	2022-08-31
Release Version	1

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Sample Preparation:

Sampleprep ID:	SP002355
Sampleprep Summary:	Liver specimens were harvested and immediately flash frozen in LN2 then stored at -80°C. While kept on dry ice a 20 mg sample was removed from each liver specimen, massed using an analytical balance, and placed in a 2 mL round bottom polypropylene tube containing 4-6, 2.3 mm stainless steel beads. 500 µL of -20°C extraction solution (methanol: acetonitrile: water, 2:2:1) containing stable isotope labeled metabolite standards was added to each sample tube. Ratio of 20 mg to 500 µL was retained when masses were not exactly 20 mg. All samples were homogenized at an amplitude of 20 Hz for 15 minutes and stored at -20°C for one hour to maximize protein precipitation. Samples were then vortexed for 20 seconds and centrifuged at 4°C for 5 minutes, speed 14,000 rcf. 120 µL of supernatant was removed from each tube and filtered using 0.2 µm polyvinylidene fluoride filter (Agilent Technologies P/N: 203980-100) and collected via 6,000 rcf centrifuge for 4 minutes. An additional 50uL was removed from each sample and combined into 5 pooled samples analyzed at equal intervals throughout the analysis to ensure stable signal. Extracts, pools, and procedural blanks were sealed and stored at 4°C until prompt analysis.

Sampleprep ID:

SP002355

Sampleprep Summary:

Liver specimens were harvested and immediately flash frozen in LN2 then stored at -80°C. While kept on dry ice a 20 mg sample was removed from each liver specimen, massed using an analytical balance, and placed in a 2 mL round bottom polypropylene tube containing 4-6, 2.3 mm stainless steel beads. 500 µL of -20°C extraction solution (methanol: acetonitrile: water, 2:2:1) containing stable isotope labeled metabolite standards was added to each sample tube. Ratio of 20 mg to 500 µL was retained when masses were not exactly 20 mg. All samples were homogenized at an amplitude of 20 Hz for 15 minutes and stored at -20°C for one hour to maximize protein precipitation. Samples were then vortexed for 20 seconds and centrifuged at 4°C for 5 minutes, speed 14,000 rcf. 120 µL of supernatant was removed from each tube and filtered using 0.2 µm polyvinylidene fluoride filter (Agilent Technologies P/N: 203980-100) and collected via 6,000 rcf centrifuge for 4 minutes. An additional 50uL was removed from each sample and combined into 5 pooled samples analyzed at equal intervals throughout the analysis to ensure stable signal. Extracts, pools, and procedural blanks were sealed and stored at 4°C until prompt analysis.