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Sturgeons are among the most ancient linages of actinopterygians. At present, many sturgeon species are critically endangered. Surrogate production could be used as an affordable and a time-efficient method for endangered sturgeons. Our study established a method for identifying and isolating type A spermatogonia from different developmental stages of testes using flow cytometric cell sorting (FCM). Flow cytometric analysis of a whole testicular cell suspension showed several well-distinguished cell populations formed according to different values of light scatter parameters. FCM of these different cell populations was performed directly on glass slides for further immunocytochemistry to identify germ cells. Results showed that the cell population in gate P1 on a flow cytometry plot (with high forward scatter and high side scatter parameter values) contains the highest amount of type A spermatogonia. The sorted cell populations were characterized by expression profiles of 10 germ cell specific genes. The result confirmed that setting up for the P1 gate could precisely sort type A spermatogonia in all tested testicular developmental stages. The P2 gate, which was with lower forward scatter and side scatter values mostly, contained type B spermatogonia at a later maturing stage. Moreover, expressions of plzf, dnd, boule, and kitr were significantly higher in type A spermatogonia than in later developed germ cells. In addition, plzf was firstly found as a reliable marker to identify type A spermatogonia, which filled the gap of identification of spermatogonial stem cells in sterlet. It is expected to increase the efficiency of germ stem cell culture and transplantation with plzf identification. Our study thus first addressed a phenotypic characterization of a pure type A spermatogonia population in sterlet. FCM strategy can improve the production of sturgeons with surrogate broodstock and further the analysis of the cellular and molecular mechanisms of sturgeon germ cell development.
Effekte einer Überexpression von Angiotensin II Typ 2 Rezeptoren in der Nebenniere von Ratten
(2010)
Die Kontrolle der Aldosteronbiosynthese in der ZG der Nebenniere wird hauptsächlich über den AT1R vermittelt. Die Funktion des AT2R hingegen, der in geringerem Ausmaß ebenfalls in der ZG exprimiert wird, ist weitgehend ungeklärt. Zur Untersuchung der Rolle des AT2R bei der AT1R-vermittelten Aldosteronbiosynthese wurde ein transgenes Rattenmodell entwickelt, dass Maus-AT2R in der Nebenniere, im Herz, Gehirn, Skelettmuskel, in Gefäßen und Niere überexprimiert. Mittels nicht radioaktiver ISH konnte eine starke Überexpression von Maus-AT2R in der ZG nachgewiesen werden. Nach Stimulation des RAS mit exogen zugeführtem ANGII in einem 2-wöchigen Tierexperiment, konnte ein schnellerer und stärkerer Anstieg der PAK gemessen werden und somit ein inhibitorischer Effekt des AT2R auf die Aldosteronproduktion ausgeschlossen werden.