Summary of Study ST002827

This data is available at the NIH Common Fund's National Metabolomics Data Repository (NMDR) website, the Metabolomics Workbench,, where it has been assigned Project ID PR001769. The data can be accessed directly via it's Project DOI: 10.21228/M82130 This work is supported by NIH grant, U2C- DK119886.


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.

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Study IDST002827
Study TitleMulti-assay nutritional metabolomics profiling of low vitamin A status versus adequacy is characterized by reduced plasma lipid mediators among lactating women in the Philippines: A pilot study.
Study TypeCase-control
Study SummaryLow vitamin A (VA) status is common among lactating women in low-income countries. Lactation has substantial effects on mother’s metabolism and VA is required in multiple biological processes, including growth, vision, immunity, and reproduction. The objective of this pilot study was to utilize metabolomics profiling to conduct a broad, exploratory assessment of differences in plasma metabolites associated with low VA status versus VA adequacy in lactating women. Plasma samples from lactating women who participated in a survey in Samar, Philippines, were selected from a cross-sectional study based on plasma retinol concentrations indicating low (VA-; n=5) or adequate (VA+; n=5) VA status (plasma retinol <0.8 or >1.05 µmol/L). The plasma results collected from six metabolomics assays (oxylipins, endocannabinoids, bile acids, primary metabolomics, biogenic amines, and lipidomics) were compared by group using liquid chromatography mass spectrometry. Twenty-eight metabolites were altered in the VA- versus VA+ status groups, with 24 being lipid mediators (p<0.05). These lipid mediators included lower concentrations of arachidonic acid- and eicosapentaenoic acid-derived oxylipins, as well as lysophospholipids and sphingolipids, in the VA- group (p<0.05). Chemical similarity enrichment analysis identified HETEs, HEPEs, and DiHETEs as significantly altered oxylipin clusters (p<0.0001, false discovery rate (FDR) p<0.0001), as well as sphingomyelins, saturated lysophosphatidylcholines, phosphatidylcholines, and phosphatidylethanolamines (p<0.001, FDR p<0.01). The multi-assay nutritional metabolomics profiling of low VA status compared with adequacy in lactating women was characterized by reduced lipid mediator concentrations. Future studies with stronger study designs and larger sample size are needed to confirm and validate these preliminary results.
California Polytechnic State University, San Luis Obispo
DepartmentFood Science and Nutrition
LaboratoryCal Poly Metabolomics Service Center
Last NameLa Frano
First NameMichael
AddressAttn: Dr. Michael La Frano Bldg 11 Room 239 Cal Poly State University 1 Grand Avenue San Luis Obispo, CA 93407
Phone(805) 756 6233
Submit Date2023-03-24
Num Groups2
Total Subjects10
Raw Data AvailableYes
Raw Data File Type(s)mzML
Analysis Type DetailAPI
Release Date2023-09-14
Release Version1
Michael La Frano Michael La Frano application/zip

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Treatment ID:TR002945
Treatment Summary:The samples for this study were obtained from archived specimens from a cross-sectional survey that assessed the prevalence of VAD among a convenience sample of 207 lactating women in the province of Santa Margarita, Samar, Philippines. The original protocol was approved by the UC Davis IRB 290430-5 and the ethical committee of the local Ministry of Health in Eastern Visayas (Region VIII), Philippines. Excluded from the study were individuals who did not consent to further analysis of banked samples, had insufficient plasma remaining for metabolomics analysis, had samples that were not stored at the University of California, Davis, or had acute phase protein concentrations above normal range, including plasma C-reactive protein (CRP) > 5 mg/L or plasma α-1-acid glycoprotein (AGP) > 1.0 g/L (both measured by radial immunodiffusion). For the remaining samples eligible for metabolomics analysis, participants were divided into two groups with the lowest and highest concentrations based on their plasma VA concentrations. We selected 5 participants with plasma retinol ≤ 0.8 μmol/L and 5 participants with plasma retinol >1.05 μmol/L that were our low VA (VA-, < 0.8 μmol/L) or adequate VA (VA+, > 1.05 μmol/L) status groups, respectively. It must be noted that one participant in the VA- group had a plasma retinol concentration of 0.8 μmol/L, while the remaining four participants had plasma retinol ≤ 0.7 μmol/L, the cutoff for deficiency [8]. Casual breast milk retinol per gram of fat was also measured. Plasma samples analyzed in this study were collected from the antecubital vein in 7 mL Vacutainer® tubes containing K2-EDTA (Beckton Dickinson, Franklin Lakes, NJ, USA). Blood samples were shielded from light and placed in a cooler with ice packs prior to centrifugation to obtain plasma. Separated plasma samples were aliquoted into 2 ml cryovials and stored temporarily in a refrigerator until the end of data collection that day, and then frozen at -20⁰C for ~1-4 months, until transferred to Manila on dry ice, where they were stored first at -20 ºC and then later at -80ºC. Thereafter, samples were shipped on dry ice to the University of California, Davis and stored at -80ºC until analysis.
Treatment Protocol Filename:La_Frano_Treatment_Protocol_v1[23].pdf