Subject(s)
Fibrinolytic Agents/pharmacology , Tuftsin/pharmacology , Animals , Blood Coagulation/drug effects , Cattle , Dose-Response Relationship, Drug , Drug Evaluation, Preclinical , Fibrinolysis/drug effects , In Vitro Techniques , Male , Rats , Thromboplastin , Thrombosis/chemically induced , Thrombosis/prevention & controlABSTRACT
Investigations of "diabetogenic factor" (DgF) (Diploma No. 386, USSR) in the blood of men and animals with insulin-dependent diabetes have been summarized. The nature and properties of the DgF purified preparation have been outlined and its pathophysiological importance characterized. An inhibitor has been found that inactivate DgF when administered to a diseased individual. It was experimentally established that a single transplantation of cultured healthy beta-cells to an animal with diabetes was successful only in the absence of DgF activity. This leads to stable recover of the animal. The data of other authors have also been briefly discussed.
Subject(s)
Diabetes Mellitus, Type 1/etiology , Pituitary Hormones/toxicity , Animals , Diabetes Mellitus, Experimental/blood , Diabetes Mellitus, Experimental/etiology , Diabetes Mellitus, Type 1/blood , Humans , Molecular Weight , Pituitary Hormones/antagonists & inhibitors , Pituitary Hormones/bloodABSTRACT
Vitamin A deficiency contributed to higher incidence of abnormalities in experimental animals with insulin-dependent diabetes induced by alloxan. However, the similar doses of alloxan did not cause diabetes in the animals maintained on a diet containing adequate amounts of vitamin A used for prophylactic purposes for a long time. The natural diabetogenic factor specific to insulin-dependent diabetes was not found in the blood serum of these animals.
Subject(s)
Diabetes Mellitus, Experimental/prevention & control , Vitamin A/therapeutic use , Alloxan , Animals , Blood Glucose/analysis , Male , RatsABSTRACT
The complex of immunopeptide taftsin with low-molecular heparin has been obtained. The complex has fibrinolytic and anticoagulant activities in vitro and in vivo after the injection to albino rats.
Subject(s)
Anticoagulants/pharmacology , Fibrinolytic Agents/pharmacology , Heparin, Low-Molecular-Weight/pharmacology , Tuftsin/pharmacology , Animals , Dose-Response Relationship, Drug , Fibrinolysis/drug effects , Male , RatsABSTRACT
It has been found that low molecular heparin (LMH) forms complexes with fibrinogen and thrombin. The formation of the heparin-fibrinogen and heparin-thrombin complexes has been testified by cross-linked electrophoresis. The reaction of complex formation was carried out at variable weight ratios of the components, i.e. 1:3 and 1:6, respectively. This complex causes lysis of unstabilized clots of fibrin. All these complexes manifested a slight anticoagulative activity.
Subject(s)
Fibrinogen/metabolism , Heparin, Low-Molecular-Weight/blood , Thrombin/metabolism , Animals , Blood Coagulation/drug effects , Blood Protein Electrophoresis , Fibrinogen/analysis , Fibrinolysis/drug effects , In Vitro Techniques , Protein Binding , Rats , Thrombin/analysisABSTRACT
Complexes of low-molecular heparin with acetylsalicilic acid was formed in vitro when the weight ratio of components was 1:1, 1:5 and 5:1, respectively. All the complexes possessed fibrinolytic and anticoagulating activities. The complex possessed the highest activity when the ratio of heparin to acetylsalicilic acid was 5:1. This complex at a dose 1 mg/200 g of rat weight had the largest thrombolytic effect on the experimental fresh thrombus.
Subject(s)
Aspirin/therapeutic use , Fibrinolytic Agents/therapeutic use , Heparin, Low-Molecular-Weight/therapeutic use , Animals , Anticoagulants/pharmacology , Anticoagulants/therapeutic use , Aspirin/pharmacology , Blood Coagulation Tests , Drug Combinations , Drug Evaluation, Preclinical , Fibrinolytic Agents/pharmacology , Heparin, Low-Molecular-Weight/pharmacology , Jugular Veins , Male , Rats , Thrombosis/blood , Thrombosis/drug therapyABSTRACT
Low-molecular heparin preparations (a Soviet sample and that manufactured by the Celsus Company) in vitro, added to bovine plasma possess a lower antifactor-II activity, less time of recalcification and partial thromboplastin time as compared to high-molecular heparin of equal concentration (mg/ml) or dose (Units/ml). After intravenous injection of low-molecular heparin preparations to animals in a dose of 50 Units/200 g bw the time of hemorrhage was far less, while anticoagulant activity was lower than in animals given the same dose of high-molecular heparin. Both injection of low-molecular and high-molecular heparin results in a rise of the intensity of non-enzymatic fibrinolysis in the animals' blood plasma.
Subject(s)
Hemostasis/drug effects , Heparin, Low-Molecular-Weight/pharmacology , Heparin/pharmacology , Animals , Blood Coagulation Tests , Fibrinolysis/drug effects , Heparin/administration & dosage , Heparin, Low-Molecular-Weight/administration & dosage , Injections, Intravenous , Male , Molecular Weight , Rats , Time FactorsABSTRACT
In the present work, the nature of an anticoagulant from Philipendula ulmaria was studied. A method for purification of this anticoagulant was developed. Using diverse methods it was shown that the molecular weight, data on element (sulphur, nitrogen, and hydrogen) content, spectral characteristics in the infrared region of the spectrum, and electrophoretic properties of the product indicate its similarity to heparin of animal origin.
Subject(s)
Heparin/isolation & purification , Plants, Medicinal , Animals , Chromatography, Gel , Electrophoresis, Polyacrylamide Gel , Heparin/analysis , Heparin/pharmacology , Molecular Weight , Partial Thromboplastin Time , Rats , Spectrometry, Mass, Fast Atom Bombardment , Spectrophotometry, Infrared , Thrombin TimeABSTRACT
It is shown that preparations of regulatory peptides (RP): interleukin-1, thymoptin, and the endogenous nonpeptide opioid salsalinol produce a marked depolymerization effect on the fibrin-monomer and display nonenzymatic fibrinolytic activity in relation to unstabilized fibrin. Preparations of regulatory peptides thymalin and diphensin of rabbits intensify fibrin polymerization. A single intravenous infusion of diphensin preparation inhibits nonenzymatic fibrinolysis of blood plasma in vivo and in vitro. Repeated intramuscular injections of the immunoactive preparation thymoptin intensify the fibrinolytic properties of blood plasma in rats.
Subject(s)
Fibrin Fibrinogen Degradation Products/drug effects , Fibrinolysis/drug effects , Peptides/pharmacology , Animals , Endorphins/pharmacology , Fibrin Fibrinogen Degradation Products/analysis , Fibrinogen/analysis , Fibrinogen/drug effects , Hemostasis/drug effects , Humans , In Vitro Techniques , Rabbits , Rats , Time FactorsABSTRACT
Heparin/acetylsalicylate complexes (1:9 and 10:1) were obtained in vitro. Single or chronic (7-8 days) per os administration to white rats of 0.1% solution of the heparin/acetylsalicylate complex (0.3 ml/200 g body weight) enhanced anticoagulative properties of blood plasma, increased the fibrinolytic activity in respect of stabilized fibrin, and diminished the thrombin-induced platelet aggregation.
Subject(s)
Aspirin/administration & dosage , Blood Coagulation/drug effects , Heparin/administration & dosage , Administration, Oral , Animals , Drug Combinations , Fibrinolysis/drug effects , Male , Platelet Aggregation/drug effects , Rats , Time FactorsABSTRACT
Implantation of beta-cells allogenic culture into animals with alloxan diabetes did not produce persistent positive effect. The implanted beta-cells lost their viability as a result of toxic effect of natural diabetogenic factor occurring in blood plasma during insulin-dependent diabetes. Long-term administration of heparin into these animals within first 90 days of the experiment enabled to avoid the negative phenomenon and to neutralize the diabetogenic factor activity. Under these conditions the implanted beta-cells effectively produced endogenous insulin and the symptoms of diabetes disappeared within 14 months.
Subject(s)
Diabetes Mellitus, Experimental/metabolism , Insulin/biosynthesis , Alloxan/pharmacology , Animals , Blood Glucose/analysis , Islets of Langerhans Transplantation , Male , Pituitary Hormones/blood , RatsABSTRACT
Taftsine tetrapeptide has antiprocoagulatory properties in vitro in the presence of plasma. Taftsine exerts depolymerization influence on fibrin monomer in concentrations of 10(-1) to 10(-9) mg/ml. At intravenous injection in doses of 1 mg and 300 ug/kg, taftsine causes the increase in plasma clotting time and significant increase in enzymatic and nonenzymatic fibrinolysis. The effect can be observed during 120 min after injection of the peptide.
Subject(s)
Fibrin Fibrinogen Degradation Products/drug effects , Hemostasis/drug effects , Tuftsin/pharmacology , Animals , Biopolymers , Dose-Response Relationship, Drug , Fibrin Fibrinogen Degradation Products/metabolism , In Vitro Techniques , Injections, Intravenous , Male , Rats , Time Factors , Tuftsin/administration & dosageABSTRACT
The results of experimental studies bear evidence that the pancreas of healthy animals produces a humoral factor which differs from insulin and prevents the development of alloxan diabetes. The pancreas of diabetic animals loses the above-mentioned activity and produces into the blood plasma a natural diabetogenic factor which promotes the development of alloxan diabetes.
Subject(s)
Diabetes Mellitus, Experimental/physiopathology , Pancreas/metabolism , Pituitary Hormones/physiology , Animals , Pituitary Hormones/biosynthesisABSTRACT
Preparations of regulating peptides from hypophysis oxytocin (10(-1)-10(-3) mg/ml) and vasopressin (10(-2)-10(-5) mg/ml) demonstrated weak depolymerizing effect on unstabilized fibrin. Regulating peptides from hypothalamus thyroliberin and PR-546 (10(-1)-10(-3) mg/ml) increased polymerization of fibrin-monomer.
Subject(s)
Fibrin/metabolism , Fibrinolysis , Hormones/metabolism , Peptides/metabolism , Adrenocorticotropic Hormone/analogs & derivatives , Adrenocorticotropic Hormone/metabolism , Animals , Hypothalamic Hormones/metabolism , Oxytocin/metabolism , Polymers , Rats , Thyrotropin-Releasing Hormone/metabolism , Vasopressins/metabolismABSTRACT
A rat platelet factor has a high antiheparin activity. It also decreases nonenzymatic fibrinolytic activity of normal rat plasma and antithrombin III-heparin complex. The platelet factor 4 formed inactive complexes with heparin in molar ratios of 1:1 and 2:1. Intravenous injection of the platelet factor 4 before injection of albino rats with tissue thromboplastin prevented the reaction of anticoagulation system inactivated the synthesis of endogenous thrombin. This effect is accompanied by high hypercoagulation and depression of nonenzymatic fibrinolysis in blood.
Subject(s)
Heparin/pharmacology , Platelet Factor 4/pharmacology , Animals , Blood Proteins/drug effects , Drug Interactions , Fibrinolysis/drug effects , Hemostasis/drug effects , Male , Platelet Factor 4/isolation & purification , Rats , Restraint, Physical , Time FactorsABSTRACT
The rabbits were kept on atherogenic ration for 2 months. This diet contained 0.3 mg/kg of cholesterol. In blood plasma of animals the authors observed a sharply reduced non-enzymatic fibrinolysis and depolymerization activity of non-stabilized fibrin. The addition of antioxidants and alpha-tocopherol (10 + 10 mg/kg) for 1 month to the atherogenic ration protected from the disturbance of the system hemostasis and normalized the depolymerization of non-stabilized fibrin.
Subject(s)
Antioxidants/pharmacology , Diet, Atherogenic , Fibrin/analysis , Fibrinolysis , Vitamin E/pharmacology , Animals , Blood Coagulation Tests , Cholesterol, Dietary , Male , RabbitsABSTRACT
The flowers of Filipendula ulmaria were found to contain heparin bound to the plant proteins in the form of a complex. This complex enhances the anticoagulant and fibrinolytic properties of the nonenzymatic nature at its administration to animals both intramuscularly and intravenously. The neutralizing effect of protaminesulphate on the anticoagulant activity of the plant heparin was shown. The identity of the action on the hemostasis system of heparin of animal and plant origin was found.
Subject(s)
Heparin/analysis , Plants, Medicinal/analysis , Animals , Blood Coagulation/drug effects , Fibrinolysis/drug effects , Heparin/isolation & purification , Heparin/pharmacology , Male , Plant Proteins/analysis , Protamines/pharmacology , Protein Binding , Rats , Time FactorsABSTRACT
Addition of purified fibrin-monomer in a concentration of 0.5 mg/ml induces aggregation in a suspension of washed rat platelets in the absence of aggregants. Maximum aggregation takes place 1-3 min after fibrin-monomer addition, and then the disaggregation phase follows. Complex heparin compounds with adrenalin or plasmin possessing antipolymerization and fibrinolytic activity with respect to ++non-stabilized fibrin prevent, or to a great extent decrease fibrin-monomer-induced aggregation of washed platelets.
Subject(s)
Epinephrine/pharmacology , Fibrin Fibrinogen Degradation Products/pharmacology , Fibrinolysin/pharmacology , Heparin/pharmacology , Platelet Aggregation Inhibitors/pharmacology , Platelet Aggregation/drug effects , Animals , Drug Combinations , Epinephrine/administration & dosage , Fibrin Fibrinogen Degradation Products/antagonists & inhibitors , Fibrinolysin/administration & dosage , Heparin/administration & dosage , In Vitro Techniques , Platelet Aggregation/physiology , Platelet Aggregation Inhibitors/administration & dosage , RatsABSTRACT
Complexes between heparin and histamine at various ratio exhibited various physiological activity. The complex containing heparin-histamine at the ratio of 6:1, 10:1 or 15:1 showed anticoagulation, antipolymerization and nonenzymatic fibrinolytic effects. The complex dissociated in circulation within 90 min after its administration. This complex effected also the rheologic properties of blood.