Human Latrophilin-2 is Expressed in the Cytotrophoblast and Syncytiotrophoblast of Placenta and in Endothelial Cells
Gunda Herberth, Anke Stein, Jens Glienke, Stefan Taudien, Irina Klaman, Alexander Herr, Karl-Heinz Thierauch and Anette Sommer
DOI : 10.3844/ajbbsp.2005.135.144
American Journal of Biochemistry and Biotechnology
Volume 1, Issue 3
Latrophilin-2 is a member of the family of adhesion-GPCRs that is characterised by a long N-terminus which contains motifs identified in proteins involved in cell adhesion. We were interested in determining the expression pattern of human latrophilin-2 and to perform a biochemical characterisation of this protein. The expression pattern of latrophilin-2 was analysed in human organs, tissues and cell lines. RT-PCR analyses detect a very strong signal for latrophilin-2 in human placenta and in situ hybridisation further showed that latrophilin-2 is predominantly expressed in the cytotrophoblast and syncytiotrophoblast. Moreover, latrophilin-2 expression is visible in adherent cells with a remarkably strong signal in microvascular endothelial cells (MVEC) and in human umbilical vein endothelial cells (HUVEC). Deglycosylation experiments using glycosidase F demonstrated that the N-terminal fragment of human latrophilin-2 is highly glycosylated. Using specific antibodies and latrophilin-2 stable cell lines we could show that human latrophilin-2 is cleaved into a 135 kDa N-terminal and a 70 kDa C-terminal fragment. It was also possible to detect the N-terminal fragment of latrophilin-2 in cell culture supernatant of HUVEC indicating that endogenous latrophilin-2 is expressed on the protein level in human vascular endothelial cells and that post-translational modification and generation of a 135 kDa N-terminal fragment takes place. The role of this fragment in the activation of the transmembrane domain of latrophilin-2 or in other cellular processes remains to be elucidated.
© 2005 Gunda Herberth, Anke Stein, Jens Glienke, Stefan Taudien, Irina Klaman, Alexander Herr, Karl-Heinz Thierauch and Anette Sommer. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.