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  • Androgen receptor  (2)
  • Lithium  (2)
Publikationsart
Verlag/Herausgeber
Erscheinungszeitraum
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Research in experimental medicine 187 (1987), S. 287-294 
    ISSN: 1433-8580
    Schlagwort(e): Androgen receptor ; Dihydrotestosterone ; Ontogeny ; Puberty ; Prostate
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Concentrations of cytosolic androgen receptor, DNA and soluble protein, contents of DHT, and in-vivo uptake of3H-DHT were measured in rat ventral prostates at 5-day intervals during sexual development. Regarding prostate weight two phases of growth were noted being separated by a period of stagnation from Day 40 to 45. Cytosolic androgen receptor, particle-bound DHT, and uptake of3H-DHT into the 100,000-g sediment showed a clear pattern: a maximum in the prepubertal animal at age Day 20, a minimum at age Day 30 (4 days after the early pubertal rise of LH, testosterone, and DHT) followed by a second maximum on Day 55 (2 days before the beginning of fertility), and a second minimum in the young mature animal on Day 70. An intermediate peak seen at age Day 37 was not significant. Neither the time-dependent profile of the cytosolic androgen receptor nor the contents and in vivo uptake of DHT were correlated to concentrations of circulating gonadotrophins, growth hormone, and sex-steroids measured during puberty in the same strain of animals. Therefore, the regulating mechanism remains unclear.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Research in experimental medicine 188 (1988), S. 451-462 
    ISSN: 1433-8580
    Schlagwort(e): Androgen receptor ; Diurnal rhythm ; Rat ventral prostate ; Seasonal rhythm ; Testosterone
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Low- and high-salt (600 mM KCl) extractable androgen receptors were measured in the ventral prostate lobes of 70-day-old rats which were housed in constant environmental conditions (22 ± 2°C, 65 ± 5% air humidity, light 6.00 h–18.00 h). Seasonal variations were observed during 2 years, exhibiting elevations in late summer and autumn and depressions in late winter and spring time. These fluctuations were superposed by steep changes from month to month. The maximum and minimum values of the low- and high-salt extractable receptors differed within 1 year by a factor 8.5 and 2.4, respectively. Both receptor fractions showed a diurnal rhythm as measured during 1 day in January with maximal concentrations at 9.00 h (low-salt: median = 1 308 fmol/mg DNA) and minimal values at 18.00 (424) and 24.00 (230). The electrophoretic mobility in agar gel of pH 8.2 also showed a diurnal variation with maximal values at 18.00 h in either receptor fraction. Neither the seasonal nor the diurnal variations were correlated to the corresponding rhythms of serum testosterone concentrations. As steroid receptors may be regulated by neural transmission, in a final experiment the parasympathic innervation of the prostate was blocked by infiltrating the plexus pelvicus with a local anesthetic drug. One hour later, the total receptor concentration was not changed, while the ratio of low- to high-salt extractable receptors and the electrophoretic mobility of both fractions were elevated as compared to the control animals. This finding indicates that peripheral neural transmission rather than circulating testosterone may be involved in the regulation of androgen receptors in rat ventral prostate.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    European archives of psychiatry and clinical neuroscience 229 (1980), S. 1-16 
    ISSN: 1433-8491
    Schlagwort(e): Manic psychoses ; Valproate ; GABA ; Lithium ; Manische Psychosen ; Valproat ; GABA ; Lithium
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Unter Verwendung eines doppel-blinden ABA-Designs mit Placebo-Kontrolle wurde bei 5 Patienten mit akuter Manie eine mögliche antimanische Wirkung des GABA-ergen Anticonvulsivums Valproat untersucht. Bei 4 Patienten wurde eine deutliche Besserung beobachtet, während ein Patient auf Valproat nicht reagierte. Bei 7 weiteren Patienten mit häufig wiederkehrenden Phasen einer manischen oder maniformen schizoaffektiven Psychose, die auf die Lithium-Prophylaxe nicht ansprachen, wurde eine Dauerbehandlung mit Valproat in Kombination mit kleinen Lithium-Dosen durchgeführt. (In einem Fall wurde nur Valproat, ohne Lithium, gegeben.) Im Verlauf einer Beobachtungsphase von 1 1/2–3 Jahren wurde bei keinem dieser Patienten ein Rückfall beobachtet. Es wird die Hypothese vorgeschlagen, daß grundsätzlich GABA-erge Anticonvulsiva antimanische Eigenschaften aufweisen und daß auch der spezifische antimanische Effekt von Lithium auf einer GABA-ergen Wirkungskomponente beruht. Eine mögliche pathophysiologische Bedeutung zentraler GABA-Systeme bei affektiven und organischen Psychosen (z.B. Porphyrie, Delirium tremens) wird auf der Basis pharmakopsychiatrischer Überlegungen diskutiert.
    Notizen: Summary A possible antimanic property of the GABA-ergic anticonvulsant valproate was examined by use of a double-blind placebo-controlled ABA design in 5 acutely ill manic patients. In 4 cases a marked improvement was observed after valproate medication whereas one patient showed no response. Seven further patients with frequently recurrent episodes of a manic or maniform schizoaffective psychosis, irresponsive to lithium prophylaxis, were chronically treated with valproate in combination with low doses of lithium (one case only with valproate). Over an observation period of 1 1/2–3 years none of the patients exhibited a relapse. It is proposed that, in general, GABA-ergic anticonvulsants possess antimanic properties and that the specific antimanic effect of lithium is due to a GABA-ergic mode of action. The possible role of GABA-systems in affective disorders and in organic types of psychoses (e.g., porphyria-psychosis, delirium tremens) is discussed on the basis of pharmacopsychiatric considerations.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    European archives of psychiatry and clinical neuroscience 249 (1999), S. 144-149 
    ISSN: 1433-8491
    Schlagwort(e): Key words Depression ; Bipolar disorder ; Lithium ; Prophylaxis ; Efficacy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract It has been reported recently that the prophylactic efficacy of lithium is a transient phenomenon in many patients. Other studies suggest sustained efficacy against affective recurrences for many years. As this issue is of major therapeutic relevance, published literature considering changes in lithium efficacy over time has been reviewed. The present review includes a critical evaluation of the data and the methodology which yielded these controversial results. Considering the published data discussed in this review, the balance of evidence does not indicate a general loss of lithium efficacy in the prophylaxis of major affective disorders. A supposed persistence of the prophylactic effects in general does not, however, exclude the reappearance of affective recurrences after years of successful treatment in individual cases. Possible reasons for this phenomenon are discussed.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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