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  • 1
    ISSN: 1432-2072
    Keywords: Key words Benzodiazepine receptor partial agonist ; Long-term treatment ; Withdrawal syndrome ; Dopamine release ; Nucleus accumbens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effect of long-term treatment (three times daily for 3 weeks) with a behaviorally relevant dose of the benzodiazepine receptor partial agonist imidazenil (0.5 mg/kg, IP) on basal dopamine release in the nucleus accumbens of freely moving rats was compared with that of diazepam (3 mg/kg, IP), a benzodiazepine receptor full agonist. Challenge doses of imidazenil and diazepam decreased the extracellular dopamine concentration in the nucleus accumbens by approximately the same extent in animals repeatedly exposed to vehicle or to the respective drug. Moreover, the abrupt discontinuation of long-term treatment with diazepam or imidazenil failed to affect basal dopamine release in this brain area during the first 5 days of withdrawal. In contrast, administration of the benzodiazepine receptor antagonist flumazenil (4 mg/kg, IP) elicited a marked increase (95 or 60%) in dopamine release in the nucleus accumbens 6h after withdrawal of diazepam or imidazenil, respectively. Flumazenil induced a similar but smaller effect (50% increase) 5 days after diazepam withdrawal but had no effect 5 days after discontinuation of imidazenil treatment. The resultssupport an involvement of the mesoaccumbens dopaminergic neurons in the withdrawal syndrome precipitated by flumazenil and allow further differentiation of benzodiazepine receptor partial and full agonists with respect to dependence liability of dopaminergic neurons in the nucleus accumbens.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of epidemiology 8 (1992), S. 645-649 
    ISSN: 1573-7284
    Keywords: Chlamydia trachomatis ; Genital infection ; Infertility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Several studies have shown that previous chlamydial genital infection, reflected by serological markers, is strongly associated with tubal damage leading to tubal infertility. In 105 women undergoing laparoscopy, multiple samples were collected from the lower (urethra and cervix) and upper (endometrium, peritoneal fluid, tubal lumen) genital tract, in order to isolateChlamydia trachomatis in cell culture. Chlamydia trachomatis was isolated from at least one site in 13 (30.9%) of 42 infertile women with tubal infertility, in 5 (12.1%) of 41 women with unexplained infertility, in 1 of 4 women affected by acute salpingitis and in 1 (5.5%) of 18 women with endometriosis or uterine malformations. The latter group was the control group. Thirteen (65%) of the 20 positive women harbouredChlamydia trachomatis in their upper genital tract alone and 16 women were positive in one or both tubes. Only one of the positive women showed laparoscopic signs of acute pelvic infection. Four of the 5 positive women with unexplained infertility harbouredChlamydia trachomatis in the tubal lumen. This study confirms that chlamydial infection is strongly associated with tuba] damage. It suggests that cervical cultures are inadequate for excluding a tubal infection and that chlamydial colonization of the tubal mucosa is possible in the absence of symptoms and laparoscopic signs of active infection.
    Type of Medium: Electronic Resource
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