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Soluble Elastin Decreases in the Progress of Atheroma Formation in Human Aorta

Soluble Elastin Decreases in the Progress of Atheroma Formation in Human Aorta

Takashi Akima, Kuniaki Nakanishi, Kimihiro Suzuki, Masahiko Katayama, Fumitaka Ohsuzu, Toshiaki Kawai

Circ J. 2009 Nov;73(11):2154-62.

PMID: 19755752

Abstract:

Background:
The serum levels of soluble elastin increase in patients with aortic dissection, but its distribution and characteristics are unclear.
Methods and results:
The 173 aortic specimens were categorized into 4 groups under microscopy (non-atherosclerotic aorta, n=13; fiber-rich plaque, n=77; lipid-rich plaque, n=66; ruptured plaque, n=17). Soluble elastin was abundant within the intima of both the non-atherosclerotic aorta and fiber-rich plaque, rather than in the media, and was decreased within the intima of lipid-rich and ruptured plaques. Soluble elastin levels decreased with progress of atherosclerosis (6.0 +/-0.3 microg/mg protein in non-atherosclerotic aorta; 5.8 +/-0.2 microg/mg protein in fiber-rich plaque; 4.9 +/-0.2 microg/mg protein in lipid-rich plaque; 2.8 +/-0.4 microg/mg protein in ruptured plaque, P<0.05). As well, both matrix metalloprotease-9 activity and elastin mRNA expression showed inverse distribution against soluble elastin (r=0.437, P<0.0001; r=0.186, P<0.05, respectively). Multivariable analysis revealed a decrease in the level of soluble elastin in ruptured plaque (2.8 +/-0.4 microg/mg protein in ruptured plaque, n=18; 5.5 +/-0.2 microg/mg protein in non-ruptured plaque, n=155, P<0.01). Furthermore, western blot showed soluble elastin consists of heterogeneous molecular pattern proteins.
Conclusions:
Both the synthesis and degradation of elastin may be enhanced in active atherosclerotic lesions.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP9007583-E	Elastin, soluble from human aorta		9007-58-3	Price

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