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  • Chemistry  (54)
  • Organic Chemistry  (13)
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  • sarcoplasmic reticulum  (4)
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  • Blood pressure  (2)
  • Coarctatio aortae
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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 59 (1981), S. 35-45 
    ISSN: 1432-1440
    Schlagwort(e): Renal artery aneurysm ; Renal cyst ; Hydronephrosis ; Coarctation of the aorta ; Radiation nephritis ; Hypertension ; Renin angiotensin system ; Nierenarterienaneurysma ; Nierencyste ; Hydronephrose ; Coarctatio aortae ; Strahlennephritis ; Hypertonie ; Renin-Angiotensin-System
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung In der vorliegenden Studie wurden 19 Patienten mit seltenen Formen renaler Hypertonie untersucht: 6 Patienten mit Nierenarterienaneurysma, 6 Fälle mit unilateraler Hydronephrose, 4 Patienten mit unilateraler Nierencyste, 2 Fälle mit Coarctatio aortae und assozierter Nierenarterienstenose und ein Patient mit Strahlennephritis. Die Plasma-Renin-Aktivität (PRA) im Nierenvenenblut wurde bei 17 der 19 Fälle bestimmt. 7 dieser 17 (41%) Patienten zeigten einen signifikanten Seitenunterschied (PRA betroffene/PRA nicht betroffene Seite) ≧1,5. Der Prozentsatz positiver Tests war in verschiedenen Kollektiven vergleichbar hoch. Nur Patienten mit unilateraler Nierencyste zeigten in keinem Fall einen signifikanten PRA-Quotienten. Eine superselektive Nierenvenenrenin-Bestimmung bei 2 Patienten mit Nierenarterienaneurysma der oberen Segmentarterie zeigte in beiden Fällen eine erhöhte Plasma-Renin-Aktivität im Bereiche des Oberpols. 15 der 19 Patienten (79%) wurden operiert. Dabei kamen entweder plastisch rekonstruktive Verfahren oder eine Nephrektomie zur Anwendung. 4 Fälle mit Nierenarterienaneurysma wurden antihypertensiv behandelt. Patienten mit unilateraler Hydronephrose zeigten postoperativ die besten Ergebnisse (3 geheilt, 3 gebessert), während bei keinem der 4 Patienten mit unilateraler Nierencyste die Blutdruckwerte durch den operativen Eingriff normalisiert werden konnten (3 gebessert, 1 nicht gebessert). Die Patienten mit Coarctatio aortae und assozierter Nierenarterienstenose sowie die 2 operierten Fälle mit Nierenarterienaneurysma zeigten alle ein gutes Ansprechen auf den gefäßrekonstruktiven Eingriff (2 geheilt, 2 gebessert). Der Patient mit Strahlennephritis schließlich war 2 Jahre nach Nephrektomie gebessert. Im Gesamtkollektiv unserer operierten Patienten war die prognostische Aussagekraft der Nierenvenenreninbestimmung beschränkt. Allerdings erwies sich die selektive Nierenvenenreninbestimmung bei Patienten mit einem Aneurysma einer Nierensegmentarterie als nützlich zur Entdeckung lokaler Reninüberproduktion.
    Notizen: Summary In the present study 19 patients with rare forms of renal hypertension were investigated: 6 patients with renal artery aneurysm, 6 cases with unilateral hydronephrosis, 4 patients with unilateral simple renal cyst, 2 cases with coarctation of the abdominal aorta and associated renal artery stenosis and 1 patient with radiation nephritis. Renal venous renin activity (PRA) was determined in 17 of the 19 cases. Seven of these 17 (41%) patients showed significant PRA-ratios (PRA affected/PRA unaffected side ≧1.5). The percentage of positive tests was comparably high in the various subgroups except in patients with renal cyst, none of them showing lateralisation of renin secretion. Selective sampling in 2 patients with renal artery branch aneurysm revealed in both cases marked local renin oversecretion. Fifteen of the 19 patients (79%) were operated either by reconstruction surgery or nephrectomy. Four cases with a renal artery aneurysm were treated with antihypertensive drugs. Patients with unilateral hydronephrosis showed the best response to surgery in terms of cure rate (3 cured, 3 improved), whereas blood pressure normalisation could not be achieved in patients with simple renal cyst (2 improved, 1 unimproved). Patients with coarctation of the abdominal aorta and associated renal artery stenosis and the 2 operated cases with renal artery aneurysm showed a good effect of corrective surgery (2 cured, 2 improved). The patient with radiation nephritis finally was improved 2 years after nephrectomy. For the total group the prognostic validity of renal venous renin determination was limited. However, selective blood sampling from peripheral renal veins may be useful in cases with renal artery branch aneurysm to detect local oversecretion of renin.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    ISSN: 1432-1440
    Schlagwort(e): Renovascular hypertension ; Fibromuscular hyperplasia ; Coarctation of the aorta ; Renin angiotensin system ; Renovaskuläre Hypertonie ; Fibromuskuläre Dysplasie ; Coarctatio aortae ; Renin-Angiotensin-System
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung In der vorliegenden Studie wurden 10 Fälle mit fibromuskulär bedingter renovaskulärer Hypertonie und gleichzeitigem Befall extrarenaler Arterien untersucht. Das Patientenkollektiv zeigte eine deutliche Prävalenz des weiblichen Geschlechts (90%), das mittlere Alter betrug 31,4±12,0 Jahre und die Hypertoniedauer 3,2±4,0 Jahre. 4 der 10 Patienten wiesen Stenosen einer und 6 Stenosen bzw. Verschlüsse beider Nierenarterien auf. 2 (20%) Patientinnen zeigten neben fibromuskulären Umbauprozessen der Nierenarterien eine abdonale Coarctatio aortae. Andere Körperarterien waren mit abnehmender Häufigkeit wie folgt befallen: Arteria mesenterica superior (50%), Arteria subclavia und/oder Truncus brachiocephalicus (40%), Arteriae carotides und/oder deren Äste (30%), Truncus coeliacus (30%), Arterien der Beckenstrombahn (30%), Arteriae vertebrales (10%) und Arteria mesenterica inferior (10%). Im Vordergrund der klinischen Symptomatik stand bei 8 der 10 Patienten die Hypertonie. Beschwerden von seiten extrarenaler Gefäßveränderungen waren in diesen Fällen bei Diagnosestellung gering. In 2 Fällen mit Befall von 2 bzw. aller 3 Intestinalgefäße bestand eine Angina abdominalis. 2 Patientinnen mit Stenosen der Beckengefäße zeigten eine Claudicatio intermittens, während Stenosen bzw. Verschlüsse im Subclaviabereich nur bei starker Belastung zu Claudicationsbeschwerden führten und deshalb über einen längeren Zeitpunkt unerkannt blieben. Eine Patientin mit Verschlüssen der Arteriae carotides internae hatte zweimal einen cerebralen Insult durchgemacht. Eine seitengetrennte Bestimmung der Plasma-Renin-Aktivität im Nierenvenenblut wurde bei 7 der 10 Patienten durchgeführt. Dabei zeigten 4 dieser 7 Fälle entweder unter Ausgangsbedingungen oder 15 bzw. 30 min nach intravenöser Stimulation mit 40 mg Furosemid einen signifikanten Seitenunterschied (≧ 1,5). Bei 5 der 10 Patienten wurde eine rekonstruktive Gefäßoperation an den Nierenarterien und bei einem Patienten ein solcher nur an den Intestinalarterien vorgenommen; dabei zeigte nur einer der 5 an den Nierenarterien operierten Fälle eine Heilung. Bei 3 der 5 medikamentös behandelten Patienten ließ sich eine Blutdrucknormalisierung durch Antihypertensiva erzielen. Unsere Ergebnisse zeigen, daß bei Patienten mit fibromuskulär bedingter Nierenarterienstenose verschiedenste Körperarterien mitbeteiligt sein können, am häufigsten jedoch die Arteria mesenterica superior. Bei 2 der 10 Patienten fand sich neben der renovaskulären Hypertonie eine Coarctatio aortae. Wegen des schlechten Operationserfolges sollte zunächst der Versuch einer medikamentösen Blutdruckeinstellung unternommen werden. Wegen des hohen Anteils doppelseitiger Nierenarterienstenosen hat die seitengetrennte Bestimmung der Plasma-Renin-Aktivität im Nierenvenenblut nur eine beschränkte Aussagekraft.
    Notizen: Summary In the present study 10 patients with renovascular hypertension due to fibromuscular hyperplasia and fibromuscular lesions of extrarenal arteries were investigated. The 10 patients were predominantly female (90%), showed a mean age of 31.4±12.0 years and a mean duration of hypertension of 3.2±4.0 years. Four of the 10 patients (40%) showed unilateral and six (60%) bilateral stenosis or occlusions of the renal arteries. In two (20%) cases a combination of renal artery stenosis and coarctation of the abdominal aorta was observed. Other extrarenal arteries were affected as follows: mesenteric superior artery (50%), subclavian artery and/or arteria anonyma (40%), carotid arteries and/ or their branches (30%), vertebral arteries (10%), and mesenteric inferior artery (10%). In eight of the 10 patients the most prominent clinical symptom was hypertension. Clinical symptoms from extrarenal artery stenoses or occlusions were mild. Two patients with fibromuscular lesions of two and three intestinal arteries, respectively, suffered from angina abdominalis. In two cases with stenoses of the iliacal arteries intermittent claudicatio was observed, whereas involvement of the subclavian artery was associated with only mild symptoms. One patient with occlusions of both internal carotid arteries had two episodes of cerebrovascular ischemia. Plasma renin activity was determined in both renal veins in seven of the 10 patients (70%). Four of the seven patients (57%) showed a PRA-ratio of ≧1.5 either under basal conditions or 15 and/or 30 min after i.v. stimulation with 40 mg furosemide. Only one of the five patients with revascularization operations was cured postoperatively. In one patient only the intestinal arteries were operated. Three of five cases treated with various antihypertensive drugs were normotensive. Our results show that in patients with renovascular hypertension due to fibromuscular hyperplasia extrarenal arteries may be frequently affected. The most frequent site of extrarenal lesions was the mesenteric superior artery. In two of the 10 patients renovascular hypertension was combined with a coarctation of the abdominal aorta. In this study the effect of reconstructive renovascular surgery was insufficient. Thus, these cases should first be treated with antihypertensive drugs. The diagnostic validity of renal venous renin activity was limited because of the high percentage of bilateral renovascular lesions.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    ISSN: 1433-8580
    Schlagwort(e): Potassium ; Blood pressure ; Intracellular electrolytes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary To study the mechanisms by which K+ influences vascular tone in hypertension, spontaneously hypertensive and normotensive rats were examined during an oral K+ load. There was a marked decrease in blood pressure in spontaneously hypertensive but not in normotensive rats. Intraerythrocytic K+ concentration and activity increased in normotensive but not in spontaneously hypertensive rats. Intraerythrocytic Na+ concentration and activity declined in both strains, the decrease in Na+ activity being more prominent in spontaneously hypertensive rats (P〈0.05). Intraerythrocytic Ca2+ activity decreased in spontaneously hypertensive rats (P〈0.01) but not in normotensive rats. In both strains plasma aldosterone concentration increased during K+ load, the plasma renin activity being suppressed. The basal levels of plasma aldosterone in spontaneously hypertensive rats exceeded those in normotensive rats. It is concluded that intraerythrocytic Ca2+, and to a lesser extent Na+, correlate best with the blood pressure changes. These ionic changes may be mediated by hormonal factors. The significance of the elevated plasma aldosterone levels has not yet been entirely clarified.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Cellular and molecular life sciences 41 (1985), S. 1052-1054 
    ISSN: 1420-9071
    Schlagwort(e): Cardiac muscle ; phylogenesis ; sarcoplasmic reticulum ; phospholamban ; protein kinase ; Ca2+-transport
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Phospholamban, a sarcoplasmic reticulum phosphoprotein, is present in the hearts of mammalian, avian, amphibian, and fish species. Phylogenetic changes are indicated by marked differences among species in cardiac phospholamban content and by the absence of Ca2+/calmodulin-dependent phospholamban phosphorylation at an early developmental stage.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    International archives of occupational and environmental health 61 (1989), S. 463-466 
    ISSN: 1432-1246
    Schlagwort(e): Shift work ; Night shift ; Blood pressure ; 24-h blood pressure monitoring ; Circadian rhythm
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The dependence of blood pressure upon internal rhythms and the short-term effects of shift rota on the blood pressure were investigated in shift workers. Blood pressure was measured every 30 min using automatic recorders for 24 h in 17 physically working men in a chemical factory during their morning and night shifts. Mean 24-h blood pressures were identical in the morning and night shifts. There were no differences of the mean blood pressure between the respective sleeping phases or between the working periods. The amplitudes of circadian blood pressure variations were equal. There was a phase difference of 8 h corresponding to the lag between the working periods. At this 8-h lag the hourly means of the 24-h blood pressure were closely correlated (r = 0.69). Comparisons of 24-h blood pressure profiles during the first and last days of a night shift week showed that the effects of night work on the blood pressure were already fully developed within the first 24h (r = 0.86). Thus the diurnal variations of the blood pressure are determined by the working and sleeping periods and largely independent of endogenous rhythm. There is no short-term alteration of the mean 24-h blood pressure after shift rota.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    European journal of pediatrics 154 (1995), S. 389-391 
    ISSN: 1432-1076
    Schlagwort(e): Sorbitol dehydrogenase ; Lens ; Congenital cataract
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Lens sorbitol dehydrogenase activity was assayed in patients with congenital cataracts, senile cataracts, without cataracts and in one fetal lens. In patients with congenital cataracts we did not observe any abnormality of galactose and sorbitol metabolising enzymes in erythrocytes. In one of these patients with inexplicable congenital cataracts lens sorbitol dehydrogenase deficiency was found. Conclusion Determination of galactose metabolising enzymes, sorbitol dehydrogenase and polyols in lenses may help in understanding the mechanism of formation of inexplicable congenital cataracts.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Archives of toxicology 53 (1983), S. 207-211 
    ISSN: 1432-0738
    Schlagwort(e): Milk ; Human ; Cadmium
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Electrothermal atomic absorption spectrophotometry was employed to analyse cadmium in breast milk. Twenty breast milk samples were donated by seven mothers during 6 months of lactation. All milk samples represented every feeding during a period of 24 h, having foremilk an hindmilk in equal proportions. The median cadmium concentration in the 1st month was 2.0 μg/l (range 1.7–3.1 μg/l, 7 samples) and then declined to 1.5 μg/l (range 1.3–2.5 μg/l, 7 samples) and 1.6 μg/l (range 1.2–2.0 μg/l, 6 samples) in the 3rd and 6th months, respectively. At the age of 1 and 3 months when the infants were totally breast fed the average weekly intake of cadmium was 2.7 and 1.5 μg/kg. This is below the provisional tolerable weekly intake of man, from 6.7 to 8.3 μg/kg, proposed by WHO.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    European journal of pediatrics 154 (1995), S. 389-391 
    ISSN: 1432-1076
    Schlagwort(e): Key words Sorbitol dehydrogenase ; Lens ; Congenital cataract
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Lens sorbitol dehydrogenase activity was assayed in patients with congenital cataracts, senile cataracts, without cataracts and in one fetal lens. In patients with congenital cataracts we did not observe any abnormality of galactose and sorbitol metabolising enzymes in erythrocytes. In one of these patients with inexplicable congenital cataracts lens sorbitol dehydrogenase deficiency was found. Conclusion Determination of galactose metabolising enzymes, sorbitol dehydrogenase and polyols in lenses may help in understanding the mechanism of formation of inexplicable congenital cataracts.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    ISSN: 1573-4919
    Schlagwort(e): neonatal rat cardiomyocyte culture ; sarcoplasmic reticulum ; phospholamban ; calcium ATPase ; calcium transport ; thyroid hormone
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Notizen: Abstract This study investigates sarcoplasmic reticulum (SR) calcium-(Ca2+) transport ATPase (SERCA2a) and phospholamban (PLB) in cultured spontaneously contracting neonatal rat cardiomyocytes (CM) to ascertain the function of both SR proteins under various culture conditions. The two major SR proteins were readily detectable in cultured CM by immunofluorescent microscopy using specific anti-SERCA2 and anti-PLB antibodies. Double labeling technique revealed that PLB-positive CM also labeled with anti-SERCA2. Coexpression of SERCA2 and PLB in CM was supported by measurement of cell homogenate oxalate-supported Ca2+ uptake which was completely inhibited by thapsigargin and stimulated by protein kinase A-catalyzed phosphorylation. Under serum-free conditions, incubation of CM with the SERCA2a expression modulator 3,3′,5-triiodo-L-thyronine (100 nM, 72 h) resulted in elevated Ca2+ uptake of +33%. Specific Ca2+ uptake activity was not altered if insulin was omitted from the serum-free culture medium but total SR Ca2+ transport activity was reduced under this culture condition. The results indicate that primary culture of spontaneously contracting neonatal rat CM can be employed as a useful model system for investigating both short- and long-term mechanisms determining the Ca2+ re-uptake function of the SR under defined culture conditions.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 10
    ISSN: 1573-4919
    Schlagwort(e): heart ; postnatal development ; sarcoplasmic reticulum ; phospholamban ; calcium transport ; spontaneously hypertensive rats ; growth
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Notizen: Abstract This comparative study investigates the relationship between sarcoplasmic reticulum (SR) calcium(Ca2+)-ATPase transport activity and phospholamban (PLB) phosphorylation in whole cardiac homogenates of spo`ntaneously hypertensive rats (SHR) and their parent, normotensive Wistar Kyoto (WKY) strain during early postnatal development at days 1, 3, 6, 12 and at day 40 to ascertain any difference in SR Ca2+ handling before the onset of hypertension. At day 1, the rate of homogenate oxalate-supported Ca2+ uptake was significantly higher in SHR than in WKY (0.25 ± 0.02 vs 0.12 ± 0.01 nmoles Ca2+/mg wet ventricular weight/min, respectively; p 〈 0.001). This interstrain difference disappeared with further developmental increase in SR Ca2+ transport. Western Blot analysis and a semiquantitative ELISA did not reveal any difference in the amount of immunoreactive PLB (per mg of total tissue protein) between strains at any of the ages studied. In addition, levels of phosphorylated PLB formed in vitro in the presence of radiolabelled ATP and catalytic (C) subunit of protein kinase A did not differ between SHR and WKY at days 1, 3, 6 and 12. At day 40, C subunit-catalyzed formation of 32P-PLB was reduced by 66% (p 〈 0.001) in SHR when compared to age-matched WKY In the early postnatal period between day 1 and 12 SR Ca2+-transport values were linearly related to the respective 32P-PLB levels of both SHR and WKY rats. The results indicate that cardiac SR of SHR can sequester Ca2+ at a much higher rate immediately after birth compared to WKY rats. The disappearance of this interstrain difference with further development suggests that some endogenous neuroendocrine or nutritional factor(s) from the hypertensive mother may exert an influence upon the developing heart in utero resulting in a transiently advanced maturation of the SR Ca2+ transport function in SHR pups at the time of birth.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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