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  • 1
    ISSN: 1432-1440
    Keywords: Apolipoprotein C-II ; Hypertriglyceridemia ; Polymerase chain reaction ; Mutation ; Phenotypic variability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Screening for apolipoprotein (apo) C-II variants in the plasma of 400 students, 600 patients of a cardiological rehabilitation center, and 1200 patients of an outpatient lipid clinic by isoelectric focusing and subsequent anti-apo C-II immunoblotting led to the identification of four individuals whose plasma samples contained an apo C-II isoform with an abnormal isoelectric point. In all cases direct sequencing of PCR-amplified DNA assessed a heterozygous A to C transversion in codon 19 of the apo C-II gene which leads to the replacement of lysine with threonine. Two of the four index patients presented with moderate hypertriglyceridemia; one suffered from severe hyperlipidemia, with triglyceride levels ranging between 180 and 1900 mg/dl, depending on dietary changes. Sequencing of this proband's lipoprotein lipase gene showed no alteration compared to the wildtype sequence. A study in his family revealed that heterozygosity for apo C-II(K19T) is not associated with differences in mean lipid and lipoprotein concentrations. In conclusion, apo C-II(K19T) occurs in Germany at a frequency of approximately 1 in 550. Although this variant is not sufficient to cause hypertriglyceridemia, it may be possible that apo C-II(K19T) causes hypertriglyceridemia in the presence of additional as yet unidentified environmental and/or genetic factors.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 159 (1972), S. 65-74 
    ISSN: 1433-8580
    Keywords: Cardioactive glycosides ; Respiratory acidosis ; Alcalosis ; β-sympatholytic drugs ; Herzwirksame Glykoside ; Respiratorische Acidose ; Alkalose ; β-Sympathicolytica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An narkotisierten Katzen wurde der Einfluß des Blut-pH auf die Toxicität herzwirksamer Glykoside untersucht. An isolierten Vorhofpräparaten wurden in Ergänzung hierzu Versuche mit Änderung des pH der Tyrodelösung durchgeführt. 1. An Katzen wird durch eine respiratorische Acidose (pH 7,0) die Toxicität des Digitoxins, Digoxins und k-Strophanthins signifikant erhöht; dabei ist die Toxicität des Digitoxins stärker erhöht als die des Digoxins und k-Strophanthins. 2. Vorbehandlung mit Reserpin oder Practolol vermindert die Toxicität des Digitoxins in Acidose wesentlich stärker als bei normalem pH. 3. Eine durch Tris-Infusion erzeugte Alkalose von pH 7,6 bewirkt keine Änderung, eine durch Infusion von NaHCO3 erzeugte Alkalose von pH 7,6 verursacht eine geringfügige Steigerung der Digitoxintoxicität. 4. Am isolierten Vorhofpräparat des Meerschweinchens ist die Toxicität des Digitoxins, Digoxins und k-Strophanthins bei pH-Werten der Tyrodelösung von 7,0 und 7,8 nicht signifikant verschieden.
    Notes: Summary In anaesthetized cats the influence of blood-pH on the toxicity of cardiac glycosides was studied. In isolated guinea pigs atrias further experiments were performed by changing the pH of the tyrode solution. 1. In cats with respiratory acidosis (pH 7.0) the toxicity of digitoxin, digoxin and k-strophanthin is enhanced — thereby the toxicity of digitoxin is more enhanced than that of digoxin and k-strophanthin. 2. Pretreatment with reserpine or practolol diminishes the toxicity of digitoxin in acidosis more than at normal blood-pH. 3. An alcalosis of pH 7.6, produced by the infusion of tris causes no change, an alcalosis of pH 7.6 produced by the infusion of NaHCO3 causes a small increase of the toxicity of digitoxin. 4. In the isolated guinea pigs atria the toxicity of digitoxin, digoxin and kstrophanthin is not different at pH 7.0 and 7.8 of the tyrode solution.
    Type of Medium: Electronic Resource
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