The Short Prolactin Receptor Predominates in Endothelial Cells of Micro- and Macrovascular Origin

Background: Controversial reports on prolactin receptors (PRL-R), the long and short form, on endothelial cells (EC) may be explained by the choice of EC derived from the micro- and macrovascular bed of either endocrine and non-endocrine organs. Methods: We studied here PRL-R expression in organs [bovine corpus luteum (CL), umbilical vein, aorta] and in organ-derived EC cultures. Results: In the intact CL, both PRL-R forms were present at mRNA and protein level throughout the oestrous cycle stages. The short form prevailed as protein. PRL-R-positive EC were noted by immunofluorescent staining in arterial blood vessels of CL septa, in the umbilical vein and the aorta. In EC cultures of micro- and macrovascular origin, transcripts of both PRL-R forms were shown; again the short-form protein prevailed. Blocking experiments with anti-prolactin (PRL) antibody led to a 60% decrease in cell growth. Treatment with PRL had no effect. Conclusion: PRL-R expression in micro- and macrovascular EC is associated with the predominant short form.

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