Localization of lipids in the aortic wall with imaging TOF-SIMS

• Time-of-flight secondary-ion-mass-spectrometry (TOF-SIMS) was utilized to address the issue of localization of lipids and inorganic ions in healthy rat aorta and human atherosclerotic plaque. Pieces of rat aorta were high pressure frozen, freeze-fractured and freeze dried. The samples were analyzed by imaging TOF-SIMS equipped with a Bi(1-7)(+)-source. Reference lipid samples were analyzed and compared to data obtained by analysis of the rat aorta samples. Fatty acids, cholesterol, oxysterol and diacylglycerols were detected and localized. A heterogeneous lipid distribution could be shown in the aorta, where the lamellae of the aorta, distinguished by imaging of CN(-), appeared enriched in cholesterol, oxysterol and diacylglycerols, while the smooth muscle tissue, identified by imaging of PO(3), appeared enriched in phosphocholine. Palmitic/palmitoleic acid and stearic/oleic acid appeared to be heterogeneously distributed over the aorta with high concentration areas located especially in the tunica media region of the aorta. Human atherosclerotic plaque showed an irregular cholesterol distribution mainly located in spots in the intima region with elongated diacylglycerol regions located mainly in the media region.

Keyword

Animals

Aorta/*metabolism/ultrastructure

Atherosclerosis/metabolism

Cholesterol/metabolism

Fatty Acids

Monounsaturated/metabolism

Freeze Drying

Humans

Lipids/*analysis

Oleic Acid/metabolism

Palmitic Acid/metabolism

Rats

Rats

Sprague-Dawley

Spectrometry

Mass

Secondary Ion/*methods

Stearic Acids/metabolism

Sprague-Dawley

Publication and Content Type

ref (subject category)

art (subject category)