Sialyltransferase activity of human plasma and aortic intima is enhanced in atherosclerosis.
Biochim Biophys Acta
; 1586(1): 123-8, 2002 Jan 02.
Article
in En
| MEDLINE
| ID: mdl-11781157
ABSTRACT
Sialyltransferase activity has been determined in membrane preparations containing the Golgi apparatus that were isolated from atherosclerotic and normal human aortic intima as well as in plasma of patients with documented atherosclerosis and healthy donors by measuring the transfer of N-acetylneuraminic acid (NeuAc) from CMP-NeuAc to asialofetuin. The asialofetuin sialyltransferase activity was found to be 2 times higher in the atherosclerotic intima as compared to the normal intima and 2-fold higher in patients' plasma than in that from healthy donors. The mean values of the apparent Michaelis constant (K(m)) for the sialylating enzyme for both tissues did not differ and were close for the intima and plasma. In contrast, the maximal velocity (V(max)) was 2 times higher for the atherosclerotic intima than for the normal intima and 3 times higher for patients' plasma than for that of the donors. These results suggest that the activity of asialofetuin sialyltransferases of aortal intima is enhanced in atherosclerosis as is the secretion of their soluble forms into patients' plasma.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Aorta
/
Arteriosclerosis
/
Sialyltransferases
Limits:
Adult
/
Aged
/
Female
/
Humans
/
Male
/
Middle aged
Language:
En
Journal:
Biochim Biophys Acta
Year:
2002
Document type:
Article
Affiliation country:
RUSSIA