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Impact of sphingomyelin‐supplemented diet on phospholipid composition in diaphragm of mdx mice
Author(s) -
Zibamanzarmofrad Maral,
Basic Admir,
Doering Jonathan,
Schmelz Eva M,
Grange Robert W,
LeBlanc Paul J
Publication year - 2013
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.27.1_supplement.lb416
Subject(s) - sphingomyelin , phospholipid , sphingolipid , phosphatidylcholine , phosphatidylethanolamine , duchenne muscular dystrophy , chemistry , cardiolipin , medicine , biochemistry , endocrinology , biology , membrane
Duchenne Muscular Dystrophy (DMD) is characterized by progressive muscle degeneration which outpaces regeneration, yielding fragile membranes with phospholipids high in 18:1 and low in 18:2n6. Central to the regenerative process are sphingolipids, specifically sphingosine‐1‐phosphate (S1P), which promote satellite cell proliferation and muscle regeneration. In mdx mice, a model of DMD, S1P is deficient. Thus the purpose of this study was to examine the impact of a dietary source of sphingolipids on muscle membrane phospholipid composition in mdx mouse. C57BL10 (WT) and mdx mice were fed either an AIN76A (CON) or AIN76A with 0.1% sphingomyelin (SM) diet for 7 wks starting at age 4 wks. Phospholipids were extracted and analyzed using thin layer‐gas chromatography. Diaphragm muscle from mdx demonstrated significantly higher percent mole fraction of monoenes (specifically 18:1) and lower polyenes (specifically 18:2n6) in the three major membrane phospholipid species (phosphatidylcholine, PC; phosphatidylethanolamine, PE; cardiolipin, CL) compared to WT. SM significantly increased both n3 (specifically PE 22:6n3) and n6 (specifically CL 18:2n6) polyenes and decreased monoenes (specifically CL 18:1) compared to CON. These results suggest that dietary sphingolipids influence membrane phospholipid composition. The project was funded by NSERC (PJL) and VBI/Fralin (VT) Seed Research Fund (RWG & EMS).