RGD Reference Report - Knockdown of Inhibitory Guanine Nucleotide Binding Protein Gia-2 by Antisense Oligodeoxynucleotides Attenuates the Development of Hypertension and Tachycardia in Spontaneously Hypertensive Rats.

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Knockdown of Inhibitory Guanine Nucleotide Binding Protein Gia-2 by Antisense Oligodeoxynucleotides Attenuates the Development of Hypertension and Tachycardia in Spontaneously Hypertensive Rats.
Authors:	Ali El-Basyuni, Yousra Li, Yuan Anand-Srivastava, Madhu B
Citation:	Ali El-Basyuni Y, etal., J Am Heart Assoc. 2016 Oct 26;5(11). pii: JAHA.116.004594. doi: 10.1161/JAHA.116.004594.
RGD ID:	13507308
Pubmed:	PMID:27912212 (View Abstract at PubMed)
PMCID:	PMC5210347 (View Article at PubMed Central)
DOI:	DOI:10.1161/JAHA.116.004594 (Journal Full-text)
BACKGROUND: We previously showed that the levels of both Giα-2 and Giα-3 proteins were augmented in spontaneously hypertensive rats (SHRs) before the onset of hypertension. In addition, intraperitoneal injection of pertussis toxin, which inactivates both Giα proteins, prevented the development of hypertension in SHRs. The aim of the present study was to determine the specific contributions of Giα-2 and Giα-3 proteins to the development of hypertension. METHODS AND RESULTS: Antisense oligodeoxynucleotide of Giα-2 and Giα-3 encapsulated in PEG/DOTAP/DOPE cationic liposomes were administrated intravenously into 3-week-old prehypertensive SHRs and Wistar Kyoto rats, whereas the control Wistar Kyoto rats and SHRs received PBS, empty liposomes, or sense. The knockdown of Giα-2 but not Giα-3 protein attenuated tachycardia and prevented the development of hypertension up to age 6 weeks; thereafter, blood pressure started increasing and reached the same level as that of untreated SHRs at 9 weeks. Furthermore, Giα-2 and Giα-3 antisense oligodeoxynucleotide treatments significantly decreased the enhanced levels of Giα-2 and Giα-3 proteins, respectively, and enhanced levels of superoxide anion and NADPH oxidase activity in heart, aorta, and kidney and hyperproliferation of vascular smooth muscle cells from SHRs aged 6 weeks. In addition, antisense oligodeoxynucleotide treatment with Giα-2 but not Giα-3 restored enhanced inhibition of adenylyl cyclase by oxotremorine to WKY levels. CONCLUSIONS: These results suggested that the enhanced expression of Giα-2 but not Giα-3 protein plays an important role in the pathogenesis of hypertension and tachycardia in SHRs.

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Disease Annotations

hypertension (IMP,ISO)

Gene Ontology Annotations

Biological Process

adenylate cyclase-activating G protein-coupled receptor signaling pathway (IMP)

positive regulation of NAD(P)H oxidase activity (IMP)

positive regulation of superoxide anion generation (IMP)

positive regulation of vascular associated smooth muscle cell proliferation (IMP)

Objects Annotated

Genes (Rattus norvegicus)

Gnai2 (G protein subunit alpha i2)

Gnai3 (G protein subunit alpha i3)

Genes (Mus musculus)

Gnai2 (guanine nucleotide binding protein (G protein), alpha inhibiting 2)

Genes (Homo sapiens)

GNAI2 (G protein subunit alpha i2)

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Knockdown of Inhibitory Guanine Nucleotide Binding Protein Gia-2 by Antisense Oligodeoxynucleotides Attenuates the Development of Hypertension and Tachycardia in Spontaneously Hypertensive Rats.