N-Methyl-D-aspartate (NMDA, 200 pzM) evokes the release of [3H]norepinephrine ([3H]NE) from preloaded hippocampal slices. This effect is potentiated by dehydroepiandrosterone sulfate (DHEA S), whereas it is inhibited by pregnenolone sulfate (PREG S) and the highaffinity r inverse agonist 1,3-di(2-tolyl)guanidine, at concentrations of .100 nM. Neither 3a-hydroxy-5a-pregnan-20-one nor its sulfate ester modified NMDA-evoked [3H] NE overflow. Eighty-four female Sprague-Dawley rats (180-225 g), purchased from Iffa Credo, were kept at 21°C on a 12 hr:12 hr light/dark cycle with free access to water and Purina chow. At least 4 weeks prior to the release experiments, rats were anesthetized under ether and bilateral ovariectomy was carried out by lateral access. In a subgroup of 16 rats, anesthetized with chloral hydrate (400 mg/kg, i.p.) 3-11 days prior to the experiments, PTX (1 ,g/2 ,ul of physiological saline) was injected (using a 10-uAl Hamilton syringe) bilaterally into the dorsal hippocampus at A: 4.5, L: 4, and D: 4, according to the atlas of Paxinos and Watson (25) as described (3). Twelve control rats received an equal volume of the vehicle. When appropriate, the rats were killed by decapitation and their brains were rapidly dissected. Coronal slices (0.4-mm thick) of the hippocampus were prepared with a McIlwain tissue chopper. The slices were incubated in Krebs' solution containing[3H]NE (0.1 ,uM) and bubbled with a mixture of 95% 02/5% CO2 at 37°C for 30 min. The composition of the Krebs' solution (in mM) was NaCl 118, KCl 4.7, CaCl2 1.3, MgCl2 1.2, NaH2PO4 1, NaHCO3 25, glucose 11.1, Na2EDTA 0.04, and ascorbic acid 0.06. At the end of the incubation period, each glass chamber received two slices that were superfused continuously at a rate of 0.5 ml/min with oxygenated Mg2+-free Krebs' solution at 37°C for 68 min. As indicated in Results, one steroid and/or one of the cr ligands DTG, haloperidol, BD-1063, or spiperone were added in Mg2+-free Krebs' solution throughout the superfusion period. The prototypic a-ligand DTG was chosen since it acts on both a-i and o'2 receptors (3, 26). The universal o-antagonist haloperidol also binds to dopaminergic, serotoninergic, adrenergic, and cholinergic sites Abbreviations: 3a,5a-THP, 3a-hydroxy-Sa-pregnan-20-one; CNS, central nervous system; DHEA, dehydroepiandrosterone; DTG, 1,3-di(2-tolyl)guanidine; Gi/o protein, guanine nucleotide-binding pro-
The oestrogen withdrawal hypothesis can be extended to certain psychotic episodes not occurring during in puerperium. This provides an additional argument for the clinical relevance of oestrogen withdrawal in puerperal and related psychoses.
An 11-year-old male, neutered European cat was presented for anisocoria due to pupillary dilation in the right eye. Ophthalmic findings were restricted to this eye and consisted of a raised, darkly pigmented, retrolental mass associated with retinal detachment. Ultrasonography identified the mass lesion protruding into the vitreous cavity from the posterior pole of the eyeball and confirmed the detachment of the retina. A tentative diagnosis of an intraocular tumor was made. Radiographic evaluation and retromandibular lymph node cytology did not reveal evidence of distant metastasis. Orbital exenteration of the affected eye was performed and the tumor was diagnosed as a choroidal melanocytic tumor with no criteria of malignancy (melanocytoma). The cat died 5 months later from renal lymphoma, and necropsy did not detect metastasis of the melanocytic tumor. To our knowledge this is the first reported case of feline choroidal melanocytoma.
Objective: Oestrogen withdrawal has been hypothesized as playing a causal role in puerperal psychoses. However, oestrogen withdrawal exists in conditions others than puerperium. We searched the published case reports where a decrease in oestrogen levels not occurring during puerperium was associated with a psychotic disorder, in order to evaluate the relevance of this hypothesis. These cases were defined as oestrogen withdrawal associated psychoses. Method: A systematic research of the literature was conducted for the period 1960-2000. Results: We identified 26 observations reporting an association between a psychotic disorder and a phase of oestrogen withdrawal. Psychotic episodes were short and reversible with recurrences reported when oestrogen withdrawal recurred. Puerperal psychosis was frequently reported in the history of patients. Conclusion: The oestrogen withdrawal hypothesis can be extended to certain psychotic episodes not occurring during in puerperium. This provides an additional argument for the clinical relevance of oestrogen withdrawal in puerperal and related psychoses.
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