Abstract：
:Previously, we demonstrated that chronic exposure to low levels of estradiol-17β (E2) increases mean arterial pressure (MAP) in young female Sprague-Dawley (SD) rats, however, the underlying mechanisms are unclear. Since endothelin-1 (ET-1) is implicated in blood pressure (BP) regulation, we hypothesized that E2's effects on MAP are mediated through central ET-1. To test this, young female SD rats were either sham implanted or implanted s.c. with slow-release E2 pellets (20 ng/day for 90 days). BP was monitored by telemetry. After 75 days of E2 exposure, ETA antagonist or vehicle was administered i.c.v. After 90 days of E2 exposure, rats were sacrificed, and the paraventricular nucleus (PVN) and rostral ventrolateral medulla (RVLM) were microdissected for gene expression and protein analysis of ET-1 and its receptors. E2 exposure increased MAP after pellet implantation. Gene expression of ET-1 and ETA but not ETB receptors were upregulated in the PVN and RVLM of E2 treated animals. Further, the protein levels of ETA receptor were also increased in the PVN of E2 treated animals. However, i.c.v. infusion of the ETA antagonist did not completely block the increase in blood pressure. Our results suggest that increases in central ET-1 activity could possibly play a role in chronic E2-induced increase in BP but further studies are needed to completely understand the contribution of ET-1 in this phenomenon.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Subramanian M,MohanKumar SM,Balasubramanian P,Northcott CA,Garver H,Fink GD,MohanKumar PSdoi
10.1038/s41598-017-00213-9subject
Has Abstractpub_date
2017-03-10 00:00:00pages
139issue
1issn
2045-2322pii
10.1038/s41598-017-00213-9journal_volume
7pub_type
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