What question did this study set out to answer?

To determine whether nitric oxide and its associated downstream signaling pathways mediate leptin's inhibitory effect on angiotensin II-induced vasoconstriction in rat vascular smooth muscle cells.

October 13, 2006EndocrinologyOpen Access

The Inhibitory Effect of Leptin on Angiotensin II-Induced Vasoconstriction in Vascular Smooth Muscle Cells Is Mediated via a Nitric Oxide-Dependent Mechanism

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Authors

ARAmaia Rodrı́guezUniversitat Pompeu Fabra AFAna FortuñoUniversidad de Navarra JGJavier Gómez‐AmbrosiInstituto de Salud Carlos III

Discussion

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Implication

Preclinical study demonstrates leptin suppresses angiotensin II-induced vasoconstriction via nitric oxide in rat vascular smooth muscle, indicating an endothelium-independent depressor pathway.

Key Points

To determine whether nitric oxide and its associated downstream signaling pathways mediate leptin's inhibitory effect on angiotensin II-induced vasoconstriction in rat vascular smooth muscle cells.
Assessed nitric oxide release, nitric oxide synthase activity, and intracellular calcium levels in vascular smooth muscle cells from 10-week-old Wistar rats using biochemical assays and fura-2 fluorescence.
Evaluated contractile responses to angiotensin II in endothelium-denuded rat aortic rings using an organ bath system.
Measured inducible nitric oxide synthase expression, STAT3, and Akt phosphorylation via Western blot alongside specific pathway inhibitors (AG490, wortmannin, L-NMMA, and L-NIL).
Leptin significantly stimulated nitric oxide release and nitric oxide synthase activity (P ≤ 0.01), both of which were abolished by general and inducible nitric oxide synthase-specific inhibitors.
Leptin elevated STAT3 (P ≤ 0.01) and Akt (P ≤ 0.001) phosphorylation, whereas JAK2 or PI3K inhibitors significantly prevented the leptin-mediated increase in inducible nitric oxide synthase protein (P ≤ 0.05).
Nitric oxide synthase inhibition completely eliminated leptin's ability to block angiotensin II-induced cell activation and vasoconstriction (P ≤ 0.001).

Cite This Study

Rodrı́guez et al. (2006) studied this question.

synapsesocial.com/papers/6a87b113e6314279fbfb0590 https://doi.org/10.1210/en.2006-0940

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Implication

Preclinical study demonstrates leptin suppresses angiotensin II-induced vasoconstriction via nitric oxide in rat vascular smooth muscle, indicating an endothelium-independent depressor pathway.