A sulphur matrix complex, elastic fibril composed of a fine core of amorphous elastin and microfibrils was largely accumulated in the aortic intima of aged rats.
We examined elastic fibrils in the aortic intima of aged rats with elastin staining, elastase digestion and X-ray microanalysis. The innermost elastic lamina, heavily stained by a brief treatment with azure II-toluidine blue without heating, was thin and fragmented, and an amorphous substance that stained weakly to moderately was accumulated in the thick subendothelial space of 26-28-month-old rat aortas. The substance was always present in the intimas; to a large extent in the aged rats but rarely in 5-month-old rats, and disappeared after digestion with elastase. The amorphous substance was identified as elastic fibrils approximately 0.1-0.2 microm in diameter under an electron microscope with tannic acid-uranyl acetate/lead citrate staining. Elastase digestion revealed that elastic fibrils were composed of a number of microfibrils, which were 10-12 nm in diameter, in and around a fine core of amorphous elastin. X-ray microanalysis revealed a clear peak of sulphur in the elastic fibrils.
Ogawa
Kazushige
K
Department of Veterinary Anatomy, Graduate School of Agriculture and Biological Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan. kogawa@vet.osakafu-u.ac.jp
Sasaki
Fumihiko
F
D000367:Age Factors; D000818:Animals; D001011:Aorta / Q000033:anatomy & histology / Q000737:chemistry / Q000648:ultrastructure*; D004547:Elastic Tissue / Q000737:chemistry* / Q000648:ultrastructure*; D004549:Elastin / Q000032:analysis*; D004577:Electron Probe Microanalysis; D005109:Extracellular Matrix / Q000737:chemistry* / Q000648:ultrastructure*; D006651:Histocytochemistry; D008297:Male; D020894:Microfibrils / Q000648:ultrastructure*; D008854:Microscopy, Electron; D051381:Rats; D017207:Rats, Sprague-Dawley; D013052:Spectrometry, X-Ray Emission; D013194:Staining and Labeling; D013455:Sulfur / Q000032:analysis; D017539:Tunica Intima / Q000737:chemistry / Q000648:ultrastructure
D013455:Sulfur; D004549:Elastin