ChemInform Abstract: COORDINATION ABILITY OF THE THYROTROPIN RELEASING FACTOR. II. NICKEL(II) COMPLEXES WITH TRF

SummaryAs a basis for regulatory studies on the influence of hormones on (anti)coagulant protein production by hepatocytes, we examined the amounts of the plasma proteins antithrombin III (AT III), protein C, protein S, factor II, factor X, fibrinogen, and prealbumin produced by the hepatoma cell line HepG2, into the culture medium, in the absence and presence of insulin, β-estradiol, dexamethasone and thyroid hormone. Without hormones these cells produced large amounts of fibrinogen (2,452 ± 501 ng/mg cell protein), AT III (447 ± 16 ng/mg cell protein) and factor II (464 ± 31 ng/mg cell protein) and only small amounts of protein C (50 ± 7 ng/mg cell protein) and factor X (55 ± 5 ng/mg cell protein). Thyroid hormone had a slight but significant effect on the enrichment in the culture medium of the anticoagulant protein AT III (1.34-fold) but not on protein C (0.96-fold) and protein S (0.91-fold). This hormone also significantly increased the amounts of the coagulant proteins factor II (1.28-fold), factor X (1.45-fold) and fibrinogen (2.17-fold). Insulin had an overall stimulating effect on the amounts of all the proteins that were investigated. Neither dexamethasone nor ß-estradiol administration did substantially change the amounts of these proteins.We conclude that the HepG2 cell is a useful tool to study the hormonal regulation of the production of (anti)coagulant proteins. We studied the overall process of protein production, i.e., the amounts of proteins produced into the culture medium. Detailed studies have to be performed to establish the specific hormonal effects on the underlying processes, e.g., transcription, translation, cellular processing and transport, and secretion.

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A Study of Three Cases of Familial Congenital Hypoprothrombinaemia (Factor II Deficiency)

Thrombosis and Haemostasis ◽

10.1055/s-0038-1654845 ◽

1964 ◽

Vol 11 (02) ◽

pp. 497-505 ◽

Cited By ~ 3

Author(s):

O de Bastos ◽

R. S Reno ◽

O. T Correa

Keyword(s):

Clotting Factors ◽

Factor Ii ◽

Group B ◽

Haemorrhagic Disease ◽

Rule Out

SummaryThree cases of true congenital hypoprothrombinaemia are presented.Studies were made to prove the deficiency of prothrombin in the patient’s plasma and to rule out deficiency of other clotting factors or the presence of abnormal anti-thrombin substances.All the patients were of group B.The results obtained confirm that the patients have a real prothrombin deficiency as the cause of a severe haemorrhagic disease.

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Antiprothrombinase and Factor II Deficiency in a Non SLE Patient

Thrombosis and Haemostasis ◽

10.1055/s-0038-1653448 ◽

1981 ◽

Vol 46 (03) ◽

pp. 670-670 ◽

Cited By ~ 7

Author(s):

G Follea ◽

B Coiffier ◽

J P Viale ◽

M Dechavanne

Keyword(s):

Factor Ii

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Changes in Blood Coagulation and Fibrinolysis in Rats Fed Atherogenic Diets

Thrombosis and Haemostasis ◽

10.1055/s-0038-1654785 ◽

1963 ◽

Vol 10 (02) ◽

pp. 295-308 ◽

Cited By ~ 8

Author(s):

Clarence Merskey ◽

Herbert Wohl

Keyword(s):

Blood Coagulation ◽

Blood Platelets ◽

Coagulation Factors ◽

Atherogenic Diet ◽

Normal Serum ◽

Significant Prolongation ◽

Lysis Time ◽

Factor Ii ◽

Euglobulin Lysis Time ◽

Coagulation And Fibrinolysis

Summary1. Groups of rats were fed thrombogenic diets and the effects on blood coagulation and fibrinolysis assessed.2. Animals fed a diet containing cholesterol, thiouracil and cholic acid developed high levels of coagulation factors I, II, V, VII—X, VIII, IX and X.3. Animals fed a similar diet with additional 40% beef fat developed even greater elevation of V, VII—X, VIII and X, similar elevation of factor II, and lesser (but still significant) elevation of factors I and IX. In addition marked elevation of blood platelets occurred.4. Euglobulin lysis time of the group not fed the additional fat was longer than in controls. Significant prolongation of euglobulin lysis time was not found in the group fed additional fat.5. If the increased levels of plasma fibrinogen were taken into account, it was found that a larger amount of fibrin was lysed per unit time in the euglobulin lysis test with plasma from rats fed either atherogenic diet compared with controls.6. Defective thromboplastin generation was present in both groups of rats fed an atherogenic diet. The defect was present in the serum and was not due to lack of a factor required for thromboplastin generation. An inhibitor was present in the serum which was capable of preventing the action of normal serum.7. No good correlation was found between the occurrence of changes in blood coagulation or fibrinolysis and the presence or absence of thrombosis and infarction.8. The exact cause of these anomalies remains unexplained, as does the cause of the thrombosis in these animals. Starvation per se does not account for these abnormal findings. They could not adequately be explained on the basis of “hypercoagulability” of the blood.

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The Reaction of Thiol Compounds with the Vitamin-K Dependent Clotting Factors

Thrombosis and Haemostasis ◽

10.1055/s-0038-1653570 ◽

1969 ◽

Vol 21 (03) ◽

pp. 573-579 ◽

Cited By ~ 1

Author(s):

P Fantl

Keyword(s):

Prothrombin Time ◽

Vitamin K ◽

Anaerobic Conditions ◽

Clotting Factors ◽

Thiol Compounds ◽

Aerobic Conditions ◽

One Stage ◽

Factor Ii ◽

Ph Dependent ◽

The One

SummaryTreatment of human and dog oxalated plasma with 0.2 to 1.0 × 10−1 M 2.3-dithiopropanol (BAL) or dithiothreitol (DTT) at 2–4° C for 30 min results in the reduction of the vitamin-K dependent clotting factors II, VII, IX and X to the respective-SH derivatives. The reaction is pH dependent. Under aerobic conditions the delayed one stage prothrombin time can be partly reversed. Under anaerobic conditions a gradual prolongation of the one stage prothrombin time occurs without reversal.In very diluted plasma treated with the dithiols, prothrombin can be converted into thrombin if serum as source of active factors VII and X is added. In contrast SH factors VII, IX and X are inactive in the specific tests. Reoxidation to active factors II, VII, IX and X takes place during adsorption and elution of the SH derivatives. The experiments have indicated that not only factor II but also factors VII, IX and X have active-S-S-centres.

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Coagulation Findings in Rats with Experimental Hypersplenism and Their Changes after Splenectomy and after Administration of Adrenaline

Thrombosis and Haemostasis ◽

10.1055/s-0038-1654190 ◽

1970 ◽

Vol 23 (03) ◽

pp. 593-600

Author(s):

P Pudlák ◽

I Farská ◽

V Brabec ◽

V Pospíšilová

Keyword(s):

Factor Viii ◽

Normal Control ◽

Normal Values ◽

Coagulation Factors ◽

Factor Vii ◽

Factor V ◽

Thrombin Time ◽

Factor Ii ◽

Recalcification Time

Summary1. The following coagulation changes were found in rats with experimental hypersplenism: a mild prolongation of the recalcification time, shortened times in Quick’s test, a lowered activity in plasma thrombin time and shortened times in the partial thromboplastin test. Concentrations of factor II, V, VII (+X), VIII and X did not differ from those of normal control rats.2. The administration of adrenaline to hypersplenic rats induced the correction of the partial thromboplastin test, Quick’s test and plasma thrombin time to normal values. Concentrations of coagulation factors were not significantly changed. An increase was found in factor V.3. Splenectomy performed in hypersplenic rats was followed by a shortened recalcification time, a prolongation of the partial thromboplastin test and of the test with partial thromboplastin and kaolin. A prolongation was also observed in Quick’s test. Complete correction of plasma thrombin time was not observed. The concentration of factor VII increased.4. The administration of adrenaline to splenectomized rats with experimental hypersplenism did not induce any significant changes with the exception of a corrected plasma thrombin time and a decreased concentration of factor VIII.5. A different reaction of factor VIII to adrenaline in normal and hypersplenic rats is pointed out.

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Factor II Related Antigen and Antithrombin III Levels as Indicators of Liver Failure in Consumption Coagulopathy

Thrombosis and Haemostasis ◽

10.1055/s-0038-1657171 ◽

1982 ◽

Vol 47 (03) ◽

pp. 218-220 ◽

Cited By ~ 13

Author(s):

P Sié ◽

E Letrenne ◽

C Caranobe ◽

M Genestal ◽

B Cathala ◽

...

Keyword(s):

Liver Failure ◽

Antithrombin Iii ◽

Coagulation Factors ◽

Consumption Coagulopathy ◽

Blood Coagulation Factors ◽

Factor Ii ◽

At Iii ◽

Group A ◽

Group B

SummaryIn order to detect impaired synthesis of blood coagulation factors associated to consumption coagulopathy, a simultaneous evaluation of factor II-related antigen (II rAg) and of antithrombin III (AT III) was carried out in 16 patients affected with severe defibrination. An in vitro preliminary study on plasma and serum demonstrated that the levels of II rAg and of AT III, assessed by the Laurell technique with Behring antisera, were not reduced by the coagulation process. The patients were, a posteriori, classified into two groups according to the absence (group A) or the presence (group B) of factors predisposing to liver failure such as metastasis, cirrhosis, and prolonged shock. II rAg and AT III levels are significantly correlated; they are in the normal range in group A but reduced in group B. Thus II rAg or AT III level determinations are useful markers in the detection of liver failure associated to the consumption phenomenon. These results also suggest that part of the decreased AT III levels reported in severe cases of disseminated intravascular coagulation may be the consequence of an associated liver failure.

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Spectrophotometric Assays of Prothrombin in Plasma of Patients Using Oral Anticoagulants

Thrombosis and Haemostasis ◽

10.1055/s-0038-1657025 ◽

1979 ◽

Vol 42 (04) ◽

pp. 1296-1305 ◽

Cited By ~ 29

Author(s):

R M Bertina ◽

W van der Marel-van Nieuwkoop ◽

E A Loeliger

Keyword(s):

Prothrombin Time ◽

Vitamin K ◽

Oral Anticoagulation ◽

Vitamin K Antagonists ◽

Oral Anticoagulants ◽

Factor Xa ◽

Factor V ◽

Anticoagulant Treatment ◽

Factor Ii ◽

K Deficiency

SummaryTwo spectrophotometric assays for prothrombin have been developed and compared with a one stage coagulant and an immunological assay. One of these assays (called the XAPC assay) uses a combination of factor Xa, phospholipid, Ca2+ and factor V as activator of prothrombin, and measures only normal prothrombin. The second (the ECAR assay) uses Echis carinatus venom as activator. This assay measures both normal prothrombin and PIVKA II (protein induced by vitamin K antagonists/absence). Combination of the results obtained by the XAPC and ECAR assays provides rapid and reliable information on the degree of “subcarboxylation” of prothrombin (oral anticoagulation, vitamin K deficiency).For patients on long term anticoagulant treatment the prothrombin time (Thrombotest) shows better correlation with the ratio prothrombin/prothrombin plus PIVKA II (XAPC/ ECAR) than with the factor II concentration. For patients starting the anticoagulant treatment there is no correlation between the Thrombotest time and the XAPC/ECAR ratio.It seems doubtful that (a) spectrophotometric factor II assay(s) will be as useful as the prothrombin time in the control of oral anticoagulation.

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