Abstract:
:Vitamin K is involved in the biosynthesis of a number of blood coagulation factors and bone proteins. It has been suggested that the vitamin K requirement of bone tissue is higher than that of the liver. Here we report that in rats very high doses of vitamin K affected neither the blood coagulation characteristics nor the blood platelet aggregation rate. This was observed for both phylloquinone and menaquinone-4. Both vitamers were also tested for their effects on the arterial thrombosis tendency in the rat aorta loop model. The mean obstruction times were prolonged at a high intake of menaquinone-4 (250 mg/kg body weight/day), and shortened after a similarly high phylloquinone regimen. Since (a) both vitamers only differ in their aliphatic side chains; and (b) a similar trend was observed after administration of phytol and geranylgeraniol, we conclude that the modulation of the arterial thrombosis tendency is accomplished by the side chain of vitamin K.
journal_name
Atherosclerosisjournal_title
Atherosclerosisauthors
Ronden JE,Groenen-van Dooren MM,Hornstra G,Vermeer Cdoi
10.1016/s0021-9150(97)00087-7subject
Has Abstractpub_date
1997-07-11 00:00:00pages
61-7issue
1eissn
0021-9150issn
1879-1484pii
S0021-9150(97)00087-7journal_volume
132pub_type
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