Biomaterial Database

Daytime fluctuations in blood of tissue-type plasminogen activator (t-PA) and its fast-acting inhibitor (PAI-1). 1988

C Kluft, and A F Jie, and D C Rijken, and J H Verheijen

Gaubius Institute TNO, Leiden, The Netherlands.

Circadian fluctuation in blood fibrinolytic activity was studied in 10 volunteers in the day-time period at 09.00, 12.00 and 15.00 h. Activity of tissue-type plasminogen activator (t-PA) was found to increase from 09.00 to 15.00 h in accordance with known results with global assays of blood activity. Also, activity and antigen of plasminogen activator inhibitor 1 (PAI-1) and antigen of t-PA showed fluctuations but with an opposite pattern to that of t-PA activity, with highest levels in the morning and lowest ones in the afternoon. Activity of a reversible t-PA inhibitor was constant. The discordance between fluctuations in antigen and in activity of t-PA is attributed to the inhibitory effect of PAI-1 on t-PA activity. It is concluded that the appearance into the blood of t-PA and PAI-1 shows a daytime fluctuation with a similar pattern, suggesting a co-ordinated circadian fluctuation in production of both proteins by endothelial cells.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D010959	Tissue Plasminogen Activator	A proteolytic enzyme in the serine protease family found in many tissues which converts PLASMINOGEN to FIBRINOLYSIN. It has fibrin-binding activity and is immunologically different from UROKINASE-TYPE PLASMINOGEN ACTIVATOR. The primary sequence, composed of 527 amino acids, is identical in both the naturally occurring and synthetic proteases.	Alteplase,Plasminogen Activator, Tissue-Type,T-Plasminogen Activator,Tissue-Type Plasminogen Activator,Actilyse,Activase,Lysatec rt-PA,TTPA,Tisokinase,Tissue Activator D-44,Lysatec rt PA,Lysatec rtPA,Plasminogen Activator, Tissue,Plasminogen Activator, Tissue Type,T Plasminogen Activator,Tissue Activator D 44,Tissue Type Plasminogen Activator
D010960	Plasminogen Activators	A heterogeneous group of proteolytic enzymes that convert PLASMINOGEN to FIBRINOLYSIN. They are concentrated in the lysosomes of most cells and in the vascular endothelium, particularly in the vessels of the microcirculation.	Extrinsic Plasminogen Activators,Plasminogen Activator,Uterine-Tissue Plasminogen Activator,Uterine Tissue Plasminogen Activator
D002940	Circadian Rhythm	The regular recurrence, in cycles of about 24 hours, of biological processes or activities, such as sensitivity to drugs or environmental and physiological stimuli.	Diurnal Rhythm,Nyctohemeral Rhythm,Twenty-Four Hour Rhythm,Nycthemeral Rhythm,Circadian Rhythms,Diurnal Rhythms,Nycthemeral Rhythms,Nyctohemeral Rhythms,Rhythm, Circadian,Rhythm, Diurnal,Rhythm, Nycthemeral,Rhythm, Nyctohemeral,Rhythm, Twenty-Four Hour,Rhythms, Circadian,Rhythms, Diurnal,Rhythms, Nycthemeral,Rhythms, Nyctohemeral,Rhythms, Twenty-Four Hour,Twenty Four Hour Rhythm,Twenty-Four Hour Rhythms
D006023	Glycoproteins	Conjugated protein-carbohydrate compounds including MUCINS; mucoid, and AMYLOID glycoproteins.	C-Glycosylated Proteins,Glycosylated Protein,Glycosylated Proteins,N-Glycosylated Proteins,O-Glycosylated Proteins,Glycoprotein,Neoglycoproteins,Protein, Glycosylated,Proteins, C-Glycosylated,Proteins, Glycosylated,Proteins, N-Glycosylated,Proteins, O-Glycosylated
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328	Adult	A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available.	Adults
D000941	Antigens	Substances that are recognized by the immune system and induce an immune reaction.	Antigen
D015849	Plasminogen Inactivators	Important modulators of the activity of plasminogen activators. The inhibitors belong to the serpin family of proteins and inhibit both the tissue-type and urokinase-type plasminogen activators.	Plasminogen Activator Inhibitor,Plasminogen Activator Inhibitors,Endothelial Plasminogen Activator Inhibitors,Placental Plasminogen Activator Inhibitors,Plasminogen Activator Inhibitors, Endothelial,Plasminogen Activator Inhibitors, Placental,Activator Inhibitor, Plasminogen,Inactivators, Plasminogen,Inhibitor, Plasminogen Activator,Inhibitors, Plasminogen Activator