What question did this study set out to answer?

To determine the role of the NAD(+)-dependent enzyme SIRT1 in regulating adipocyte insulin signaling pathways and inflammatory responses.

December 23, 2008Molecular and Cellular BiologyOpen Access

SIRT1 Exerts Anti-Inflammatory Effects and Improves Insulin Sensitivity in Adipocytes

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Authors

TYTakeshi YoshizakiHarbin Medical University JMJill C. MilneCatabasis Pharmaceuticals (United States)TITakeshi ImamuraTottori University

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Implication

In vitro study demonstrates SIRT1 enhances glucose uptake and suppresses inflammatory pathways in 3T3-L1 adipocytes, indicating a protective metabolic role against insulin resistance.

Key Points

To determine the role of the NAD(+)-dependent enzyme SIRT1 in regulating adipocyte insulin signaling pathways and inflammatory responses.
Knocked down SIRT1 in cultured 3T3-L1 adipocytes using RNA interference.
Treated adipocytes with small-molecule SIRT1 activators in the presence or absence of tumor necrosis factor-alpha.
Assessed glucose uptake, GLUT4 translocation, inflammatory gene expression, and phosphorylation states of IRS-1, Akt, ERK, and JNK.
SIRT1 depletion inhibited insulin-stimulated glucose uptake and GLUT4 translocation while increasing JNK phosphorylation and IRS-1 serine phosphorylation.
Depletion of SIRT1 impaired insulin cascade activation by decreasing IRS-1 tyrosine phosphorylation along with Akt and ERK phosphorylation.
Small-molecule SIRT1 activators augmented glucose uptake, decreased IRS-1 serine phosphorylation, and reversed tumor necrosis factor alpha-induced insulin resistance.

Cite This Study

Yoshizaki et al. (2008) studied this question.

synapsesocial.com/papers/6a7d13128253d2b4939ffb44 https://doi.org/10.1128/mcb.00705-08

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Implication

In vitro study demonstrates SIRT1 enhances glucose uptake and suppresses inflammatory pathways in 3T3-L1 adipocytes, indicating a protective metabolic role against insulin resistance.

SIRT1 Exerts Anti-Inflammatory Effects and Improves Insulin Sensitivity in Adipocytes

Discussion

Member takes

Implication

Key Points

Cite This Study

SIRT1 Exerts Anti-Inflammatory Effects and Improves Insulin Sensitivity in Adipocytes

Discussion

Member takes

Implication

Key Points

Cite This Study

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