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Trop Doct. 2003 Jan;33(1):53-4.
Convexity meningioma presenting as postpartum eclampsia.

Shehu BB, Ismail NJ.

Neurosurgery Unit, Department of Surgery, Ahmadu Bellow University Teaching Hospital, Zaria, Nigeria. ssrs.njskannet.com

A 37-year-old woman, Para 5(+0) presented with a 1 year history of recurrent convulsions and progressive weakness of the right side of the body. She had been treated for postpartum eclampsia in her last delivery but symptoms recurred 3 months later. Evaluation including computerized tomography scan of the brain suggested a parieto-temporal meningioma, which was completely excised at craniotomy. Histology confirmed this to be a meningioma. The patient was well at 8 months of follow up. The growth of meningiomas may increase during pregnancy due to presence of receptors for progestational hormones in the tumour and the meningioma may become symptomatic in pregnancy, presenting as eclampsia. Close follow up of patients with eclampsia is necessary to identify neurological features that may lead to a diagnosis of meningioma. Early diagnosis is essential if a good outcome is to be ensured.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12568528&dopt=Abstract

Brain Res. 1999 Feb 27;820(1-2):92-100.
Hypothalamic oxytocin in the developing ovine fetus: interaction with pituitary-adrenocortical function.

Matthews SG.

Departments of Physiology and Obstetrics and Gynecology, Faculty of Medicine, University of Toronto, Medical Sciences Building, 1 King's College Circle, Toronto, Ontario, M5S 1A8, Canada. stephen.matthewtoronto.ca

Oxytocin (OT) stimulates corticotroph function in adult sheep, however, there is little information on OT synthesis and its potential involvement in hypothalamo-pituitary-adrenal (HPA) function in the fetus. The objectives of this study were to examine developmental changes in hypothalamic OT synthesis and to investigate the actions of OT on fetal corticotroph function. Hypothalami were removed at various stages of pre- and post-natal development. OT mRNA levels were measured using in situ hybridization. For in vitro studies, fetal pituitaries were removed on days 129 and 138 of gestation. Anterior pituitary cells were dispersed and cells were treated with different concentrations and combinations of OT, corticotrophin-releasing hormone (CRH), vasopressin (AVP) and cortisol. OT mRNA was present in the paraventricular nucleus (PVN) and supraoptic nucleus (SON) by day 60 of gestation, and levels significantly increased at term. OT mRNA was present in parvocellular and magnocellular fields of the PVN. In vitro, OT stimulated adrenocorticotropin (ACTH) output in a dose-dependent fashion, but had no effect on cellular pro-opiomelanocortin (POMC) mRNA levels. There was no significant difference in corticotroph responsiveness to secretagogues between cells harvested at gestation day 129 or gestation day 138. Simultaneous exposure to CRH and OT stimulated increases in ACTH output that were significantly greater than for OT or CRH alone. However, no similar synergistic interaction existed between OT and AVP. Cortisol attenuated OT-stimulated ACTH output. In conclusion, hypothalamic OT mRNA increases at term and OT can stimulate ACTH output from fetal corticotrophs. Together, these data indicate that OT may be involved in the regulation of ACTH secretion in fetal sheep in late gestation. 1999 Published by Elsevier Science B.V.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10023035&dopt=Abstract

Toxicol Appl Pharmacol. 1999 Feb 15;155(1):54-61.
Suppression of calcium oscillation by tri-n-butyltin chloride in cultured rat hepatocytes.

Kawanishi T, Asoh H, Kato T, Uneyama C, Toyoda K, Teshima R, Ikebuchi H, Ohata H, Momose K, Hayakawa T, Takahashi M.

Division of Biological Chemistry and Biologicals, National Institute of Health Sciences, Tokyo, 158-8501, USA.

The effects of tri-n-butyltin chloride (TBT), an environmental pollutant, on cytoplasmic free calcium ion concentration ([Ca2+]i) were investigated in primary cultured rat hepatocytes. A high concentration (4.0 microM) of TBT increased resting levels of [Ca2+]i and then induced cell blebs resulting in cell death within 2 h. The increase in [Ca2+]i, but not the cell death, depended on the presence of extracellular Ca2+, suggesting that the increase in [Ca2+]i is not critical for the cytotoxicity of TBT. A low concentration (0.1 microM) of TBT did not have any toxic effect (decrease in ATP content, decrease in viability, and shape change) on cultured hepatocytes and did not change [Ca2+]i. However, the calcium responses induced by phenylephrine, [Arg8]-vasopressin, and ATP were suppressed in the cells pretreated with 0.1 microM TBT for 30 min. The suppression was not observed in the cells pretreated with 0.1 microM TBT for only 1 min. Pretreatment with 0.1 microM TBT for 30 min had no effect on the inositol 1,4,5-triphosphate content or its increase in response to hormonal stimulation. These results suggest that TBT suppresses hormone-induced calcium responses at nontoxic low concentrations. 1999 Academic Press.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10036218&dopt=Abstract

Dev Biol. 1999 Mar 1;207(1):189-203.
Expression and developmental regulation of the Hydra-RFamide and Hydra-LWamide preprohormone genes in Hydra: evidence for transient phases of head formation.

Mitgutsch C, Hauser F, Grimmelikhuijzen CJ.

Zoological Institute, University of Copenhagen, Universitetsparken 15, Copenhagen O, DK-2100, Denmark.

Hydra magnipapillata has three distinct genes coding for preprohormones A, B, and C, each yielding a characteristic set of Hydra-RFamide (Arg-Phe-NH2) neuropeptides, and a fourth gene coding for a preprohormone that yields various Hydra-LWamide (Leu-Trp-NH2) neuropeptides. Using a whole-mount double-labeling in situ hybridization technique, we found that each of the four genes is specifically expressed in a different subset of neurons in the ectoderm of adult Hydra. The preprohormone A gene is expressed in neurons of the tentacles, hypostome (a region between tentacles and mouth opening), upper gastric region, and peduncle (an area just above the foot). The preprohormone B gene is exclusively expressed in neurons of the hypostome, whereas the preprohormone C gene is exclusively expressed in neurons of the tentacles. The Hydra-LWamide preprohormone gene is expressed in neurons located in all parts of Hydra with maxima in tentacles, hypostome, and basal disk (foot). Studies on animals regenerating a head showed that the prepro-Hydra-LWamide gene is expressed first, followed by the preprohormone A and subsequently the preprohormone C and the preprohormone B genes. This sequence of events could be explained by a model based on positional values in a morphogen gradient. Our head-regeneration experiments also give support for transient phases of head formation: first tentacle-specific preprohormone C neurons (frequently associated with a small tentacle bud) appear at the center of the regenerating tip, which they are then replaced by hypostome-specific preprohormone B neurons. Thus, the regenerating tip first attains a tentacle-like appearance and only later this tip develops into a hypostome. In a developing bud of Hydra, tentacle-specific preprohormone C neurons and hypostome-specific preprohormone B neurons appear about simultaneously in their correct positions, but during a later phase of head development, additional tentacle-specific preprohormone C neurons appear as a ring at the center of the hypostome and then disappear again. Nerve-free Hydra consisting of only epithelial cells do not express the preprohormone A, B, or C or the LWamide preprohormone genes. These animals, however, have a normal phenotype, showing that the preprohormone A, B, and C and the LWamide genes are not essential for the basic pattern formation of Hydra. 1999 Academic Press.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10049574&dopt=Abstract

Kidney Int. 1999 Mar;55(3):1104-10.
Flow-mediated vasodilation and distensibility of the brachial artery in renal allograft recipients.

Hausberg M, Kisters K, Kosch M, Rahn KH, Barenbrock M.

Department of Internal Medicine D, University of Munster, Munster, Germany.hausbeni-muenster.de

BACKGROUND: Alterations of large artery function and structure are frequently observed in renal allograft recipients. However, endothelial function has not yet been assessed in this population. METHODS: Flow-mediated vasodilation is a useful index of endothelial function. We measured the diameter and distensibility of the brachial artery at rest using high-resolution ultrasound and Doppler frequency analysis of vessel wall movements in the M mode. Thereafter, changes in brachial artery diameter were measured during reactive hyperemia (after 4 min of forearm occlusion) in 16 cyclosporine-treated renal allograft recipients and 16 normal controls of similar age and sex ratio. Nitroglycerin-mediated vasodilation was measured to assess endothelium-independent vasodilation. Brachial artery blood pressure was measured using an automatic sphygmomanometer, and brachial artery flow was estimated using pulsed Doppler. RESULTS: Distensibility was reduced in renal allograft recipients (5.31 +/- 0. 74 vs. 9.10 +/- 0.94 x 10-3/kPa, P = 0.003, mean +/- sem), while the brachial artery diameter at rest was higher (4.13 +/- 0.14 vs. 3.25 +/- 0.14 mm, P < 0.001). Flow-mediated vasodilation was significantly reduced in renal allograft recipients (0.13 +/- 0.08 vs. 0.60 +/- 0.08 mm or 3 +/- 2 vs. 19 +/- 3%, both P < 0.001). However, nitroglycerin-mediated vasodilation was similar in renal allograft recipients and controls (0.76 +/- 0.10 vs. 0.77 +/- 0.09 mm, NS, or 19 +/- 3 vs. 22 +/- 2%, NS). There were no significant differences in brachial artery flow at rest and during reactive hyperemia between both groups. The impairments of flow-mediated vasodilation and distensibility in renal allograft recipients remained significant after correction for serum cholesterol, creatinine, parathyroid hormone concentrations, end-diastolic diameter, as well as blood pressure levels, and were also present in eight renal allograft recipients not treated with cyclosporine. Flow-mediated vasodilation was not related to distensibility in either group. CONCLUSIONS: The results show impaired endothelial function and reduced brachial artery distensibility in renal allograft recipients. The impairments of flow-mediated vasodilation and distensibility are not attributable to a diminished brachial artery vasodilator capacity, because endothelium-independent vasodilation was preserved in renal allograft recipients.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10027950&dopt=Abstract

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