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Open access

Michael J Gratz, Stavroula Stavrou, Christina Kuhn, Simone Hofmann, Kerstin Hermelink, Helene Heidegger, Stefan Hutter, Doris Mayr, Sven Mahner, Udo Jeschke and Aurelia Vattai

Objectives

l-dopa decarboxylase (DDC) is responsible for the synthesis of dopamine. Dopamine, which binds to the D2-dopamine receptor (D2R), plays an important role in the maintenance of pregnancy. Aim of our study was the analysis of DDC and D2R expression in placentas of spontaneous miscarriages (SMs) and recurrent miscarriages (RMs) in comparison to healthy controls.

Methods

Patients with SM (n = 15) and RM (n = 15) were compared with patients from healthy pregnancies (n = 15) (pregnancy weeks 7–13 each). Placental tissue has been collected from SMs and RMs from the first trimester (Department of Gynaecology and Obstetrics, LMU Munich) and from abruptions (private practice, Munich). Placental cell lines, BeWo- and JEG-3 cells, were stimulated with the trace amines T0AM and T1AM in vitro.

Results

Levels of DDC and D2R in trophoblasts and the decidua were lower in RMs in comparison to healthy controls. Stimulation of BeWo cells with T1AM significantly reduced DDC mRNA and protein levels. Via double-immunofluorescence, a DDC-positive cell type beneath decidual stromal cells and foetal EVT in the decidua could be detected.

Conclusions

Downregulation of DDC and D2R in trophoblasts of RMs reflects a reduced signal cascade of catecholamines on the foetal side.

Open access

Stavroula Stavrou, Michael Gratz, Eileen Tremmel, Christina Kuhn, Simone Hofmann, Helene Heidegger, Mina Peryanova, Kerstin Hermelink, Stefan Hutter, Bettina Toth, Doris Mayr, Sven Mahner, Udo Jeschke and Aurelia Vattai

differentiation of diverse reproductive tissues ( 28 , 29 ). A crosstalk between TAAR1 and dopamine D2L receptor (D2R) has formerly been described ( 6 , 30 , 31 ). Harmeier and colleagues found that the activation of the TAAR1-D2R complex negatively modulates