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2014 ; 306
(8
): E854-68
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A systematic survey of lipids across mouse tissues
#MMPMID24518676
Jain M
; Ngoy S
; Sheth SA
; Swanson RA
; Rhee EP
; Liao R
; Clish CB
; Mootha VK
; Nilsson R
Am J Physiol Endocrinol Metab
2014[Apr]; 306
(8
): E854-68
PMID24518676
show ga
Lipids are a diverse collection of macromolecules essential for normal
physiology, but the tissue distribution and function for many individual lipid
species remain unclear. Here, we report a mass spectrometry survey of lipid
abundance across 18 mouse tissues, detecting ~1,000 mass spectrometry features,
of which we identify 179 lipids from the glycerolipids, glycerophospholipids,
lysophospholipids, acylcarnitines, sphingolipids, and cholesteryl ester classes.
Our data reveal tissue-specific organization of lipids and can be used to
generate testable hypotheses. For example, our data indicate that circulating
triglycerides positively and negatively associated with future diabetes in humans
are enriched in mouse adipose tissue and liver, respectively, raising hypotheses
regarding the tissue origins of these diabetes-associated lipids. We also
integrate our tissue lipid data with gene expression profiles to predict a number
of substrates of lipid-metabolizing enzymes, highlighting choline
phosphotransferases and sterol O-acyltransferases. Finally, we identify several
tissue-specific lipids not present in plasma under normal conditions that may be
of interest as biomarkers of tissue injury, and we show that two of these lipids
are released into blood following ischemic brain injury in mice. This resource
complements existing compendia of tissue gene expression and may be useful for
integrative physiology and lipid biology.