177,166 research outputs found

    Absence of D147E mutation of CYP11B2 gene in hypertensive patients with increased corticosterone and aldosterone production.

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    Absence of D147E mutation of CYP11B2 gene in hypertensive patients with increased corticosterone and aldosterone production. Mulatero P1, Glorioso N, Fallo F, Soro A, Morra di Cella S, Carra R, Filigheddu F, Veglio F. Author information Abstract OBJECTIVE: 11beta-Hydroxylase and aldosterone synthase are two highly homologous genes involved in different forms of human hypertension and in different animal models of hypertension. It has been shown that the conservative substitution D147E in the human CYP11B2 gene results in an increased production of corticosterone and aldosterone in vitro. A gene conversion between the CYP11B1 and CYP11B2 genes could be responsible for such a substitution. METHODS: In this study we investigated the presence of the mutation D147E of CYP11B2 in a group of 128 patients with primary aldosteronism, 68 patients with essential hypertension and increased corticosterone production and in 48 normal volunteers. RESULTS AND CONCLUSIONS: We did not identify any patient carrying this mutation, indicating that if it exists it is very rare and so has no relevance in determining the increased steroid excretion seen in some subtypes of human hypertension

    Effetti a scala quinquennale dell’esclusione del pascolamento sull’habitat prioritario 6220*-“Percorsi substeppici di graminacee e piante annue dei Thero-Brachypodietea” in Sardegna

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    Questo studio analizza gli effetti della cessazione del pascolamento su un pascolo ovino mediterraneo durante un periodo di 5 anni. Il pascolamento è stato escluso sperimentalmente recintando dieci quadrati permanenti di 10 x 10 mq in cui sono stati monitorati i parametri vegetazionali e pedologici durante tre tempi dal 2000 (prima dell’esclusione) al 2005. La cessazione del pascolamento ha alterato notevolmente la composizione floristica della comunità vegetale, con una dissomiglianza media del 96,7% tra il 2000 e il 2005. Le specie d’interesse conservazionistico hanno teso a scomparire e ad essere sostituite da specie ad ampia distribuzione. La cessazione del pascolamento ha coinciso con l’aumento del pH del suolo e la diminuzione della sostanza organica, del carbonio e dell’azoto. Il risultato più significativo di questa ricerca è di aver evidenziato come i cambiamenti nelle comunità pascolive possono avvenire rapidamente dopo la cessazione del pascoloThis study analyzes the consequences of grazing abandonment on a Mediterranean sheep pasture, over a 5-years period. Plant and soil physicochemical parameters were monitored within ten 10 x 10 m permanent plots and ten unfenced control plots, during three sampling times from 2000 (before the fencing) to 2005. Grazing abandonment altered the composition of plant communities, with an average dissimilarity of 96.7% over five years. Species of conservational interest tended to disappear with pasture abandonment and were substituted by more widespread species. Pasture abandonment caused also an increase of soil pH and a decrease in soil organic matter and nitrogen. Remarkably, the results from this study reveal that changes in pastureland communities can occur rapidly following abandonmen
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