[Protease inhibitors in potatoes].
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Biomedical subjects
Publications and source records attributed to W Roszkowska.
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Histones form insoluble complexes with heparin and neutralize its anticoagulant action. The plasmin degradation products of histones do not possess these properties. Plasmin also digests histones in complexes with heparin. Breakdown of the histones in these complexes causes release of heparin from them.
The potato inhibitors of proteases inhibit the activation of trypsinogen, chymotrypsinogen, proelastase, procarboxypeptidase A and B induced by trypsin. These inhibitors do not inhibit the activation of trypsinogen induced by enterokinase. Potato inhibitors have no influence on pepsinogen autoactivation and on pepsin activity.
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Six cases of Wiliams syndrome have been observed. In 3 children the supravalvular aortic stenosis was diagnosed in infancy. The diagnosis was based upon the triad of symptoms: 1) supravalvular aortic stenosis, 2) typical appearance of the patient, 3) considerable mental disability.
Four children were observed in 1970-1973 in whom cardiomyopathy was diagnosed in early infancy. The symptoms were severe congestive cardiorespiratory failures accompanied by pulmonary infections. Considerable cardiomegaly, particularly the left ventricular and atrial hypertrophy, abnormal E.C.G. and mechanocardiographic records, rhythm and conduction disturbances were found in all cases.
Protamine-heparin complexes have a considerable resistance to physical factors of the environment such as a high ion strength and acid or alkaline pH. Free protamine is digested by plasmin giving products with a greatly decreased ability to form complexes with heparin and lower antiheparin action. Bound protamine, on the other hand, is resistant to the action of plasmin as a result of which the enzyme does not release heparin from the complexes.