A beta-típusú ösztrogén receptor szerepe LHRH sejtek működésének szabályozásában = The role of beta estrogen receptor in the regulation of LHRH cells
2007
A palyazatban meghatarozott celok az 1996-ban felfedezett, beta osztrogen receptor altipus (ER-) emlős reprodukcioban jatszott szerepenek megerteset celoztak. A palyazat tamogatasaval vegzett in situ hibridizacios es immuncitokemiai vizsgalatok felfedtek a receptor regionalis eloszlasat es előfordulasat a patkany es a human hipotalamusz tobb fontos neuroszekretoros rendszereben, koztuk a luteinizing-hormone-releasing hormon (LHRH), oxitocin es vazopresszin tartalmu neuronrendszerekben. Egyik fő eredmenykent, igazoltuk, hogy az ER- szelektiven fordul elő az emberi LHRH neuronokban is, hasonloan a korabban altalunk patkanyban megfigyeltekkel. A palyazat tamogatasaval megkezdett, es jelenleg is folyo in vivo vizsgalatsorozat egyik fő celja az ER- altal kozvetitett specifikus genomikus hatasok azonositasa, kulonos tekintettel az ER- LHRH idegsejteken ervenyesulő, pozitiv es negativ osztrogen-visszacsatolas jelensegeiben jatszott szerepere. | The long-term goal of the proposed research was to gain a better understanding of the role of the beta estrogen receptor isoform (ER-), discovered in 1996, in mammalian reproduction. In situ hybridization and immunocytochemical studies supported by this grant revealed the regional distribution of this receptor both in the rodent and human hypothalami, including its occurrence in several important neurosecretory systems, such as oxytocin and vasopressin neurons of the paraventricular and supraoptic nuclei and luteinizing hormone-releasing hormone (LHRH) neurons of the preoptic area. One of the main achievements was to prove the selective occurrence of the ER- estrogen receptor isoform in human LHRH neurons, a finding reminiscent to previous data we obtained in the rodent brain. A series of ongoing in vivo experiments, which had been started with this grant support, is aimed at identifying the specific genomic effects exerted through ER-, with a particular emphasis on its contribution to the phenomena of positive and negative estrogen feedback upon LHRH neurons.
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