What is the clinical evidence from this study?

Intervention: Nitric oxide donors (SNP, SNAP) and nNOS overexpression vs. Control. Primary outcome: AT1R mRNA and protein expression.

What question did this study set out to answer?

This research aims to investigate how nitric oxide influences the expression of AT1 receptors in neurons, particularly in the paraventricular nucleus.

January 6, 2012AJP Cell PhysiologyOpen Access

Nitric oxide inhibits the expression of AT₁ receptors in neurons

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Key result

Nitric oxide acts as an inhibitory regulator of AT1R expression in neuronal cells via a cGMP-dependent signaling pathway requiring PKG activation.

Key Points

This research aims to investigate how nitric oxide influences the expression of AT1 receptors in neurons, particularly in the paraventricular nucleus.
Utilized primary cultured hypothalamic cells from neonatal rats and the NG108-15 neuronal cell line for experiments.
Administered nitric oxide donor sodium nitroprusside (SNP) and NOS inhibitor N(G)-monomethyl-l-arginine (l-NMMA) to assess their effects on AT1 receptor expression.
Applied protein kinase G inhibitor to evaluate the mechanistic pathway involved in the regulation of AT1 receptor expression.
SNP reduced AT1 receptor protein to 10 ± 2% of control in hypothalamic cultures; l-NMMA increased it to 148 ± 8% (10(-5) M).
Similar trends were observed in NG108-15 cells with SNP at 30 ± 4% and l-NMMA at 171 ± 15% of control (10(-6) M).
The PKG inhibitor blocked the reduction of AT1 receptor levels caused by NO, indicating the involvement of the cGMP-dependent signaling pathway.

Structured PICO

Population

Primary cultured hypothalamic cells of neonatal rats and neuronal cell line NG108-15

Intervention

Nitric oxide donors (sodium nitroprusside, SNAP), NOS inhibitor (L-NMMA), nNOS antisense, and adenoviral gene transfer of nNOS

Comparator

Untreated control cells

Outcome

AT1R mRNA and protein expression levelssurrogate

Main Result

Absolute Event Rate: 10% vs 100%

Nitric oxide acts as an inhibitory regulator of AT1R expression via a cGMP-dependent signaling pathway involving PKG activation, which may have implications for sympathetic outflow in heart failure.

Discussion

No takes yet. Share an insight, caveat, or question.

Implication

May influence sympathetic regulation in experimental HF; leaves open translation of the NO-cGMP-PKG-AT1R axis to human disease.

Cite This Study

Sharma et al. (2012) studied this question. Nitric oxide donors (SNP, SNAP) and nNOS overexpression vs. Control was evaluated on AT1R mRNA and protein expression. Nitric oxide acts as an inhibitory regulator of AT1R expression in neuronal cells via a cGMP-dependent signaling pathway requiring PKG activation.

synapsesocial.com/papers/6a237ca1f11d41932608b83a https://doi.org/10.1152/ajpcell.00258.2011

View Full Paper

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Nitric oxide inhibits the expression of AT₁ receptors in neurons

Key Points

Structured PICO

Main Result

Discussion

Implication

Cite This Study

Nitric oxide inhibits the expression of AT₁ receptors in neurons

Key Points

Structured PICO

Main Result

Discussion

Implication

Cite This Study

Also Consider

Also Consider