Abstract:
:The β1‑adrenergic receptor (AR) is the primary β‑AR subtype in the heart and is the target of metoprolol (Met), which is commonly used to treat angina and hypertension. Previous studies have revealed a positive correlation between the methylation levels of the adrenoreceptor β1 gene (Adrb1) promoter in the myocardium with the antihypertensive activity of Met in spontaneously hypertensive rats (SHR), which affects β1‑AR expression in H9C2 cells. The aim of the present study was to investigate the effects of myocardial β1‑AR downregulation using short‑hairpin RNA (shRNA) against Adrb1 on the antihypertensive activity of Met in SHR. Recombinant adeno‑associated virus type 9 (rAAV9) vectors carrying Adrb1 shRNA (rAAV9‑Adrb1) or a negative control sequence (rAAV9‑NC) were generated and used to infect rat hearts via the pericardial cavity. The results of reverse transcription‑quantitative polymerase chain reaction, immunohistochemistry and western blotting analyses demonstrated that cardiac β1‑AR expression in the rAAV9‑Adrb1 group was significantly downregulated when compared with the rAAV9‑NC group (P<0.001, P<0.001 and P=0.032, respectively). In addition, a greater reduction in systolic blood pressure (SBP) was observed in the rAAV9‑NC group compared with the rAAV9‑Adrb1 group following Met treatment (P=0.035). Furthermore, downregulation of myocardial β1‑AR was associated with a significant decrease in SBP (P<0.001). In conclusion, these data suggest that suppression of β1‑AR expression in the myocardium reduces SBP and sensitivity to Met in SHR.
journal_name
Mol Med Repjournal_title
Molecular medicine reportsauthors
Huang Y,Liu XL,Wen J,Huang LH,Lu Y,Miao RJ,Liu X,Li Y,Xing XW,Yuan Hdoi
10.3892/mmr.2016.6038subject
Has Abstractpub_date
2017-02-01 00:00:00pages
703-711issue
2eissn
1791-2997issn
1791-3004journal_volume
15pub_type
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