Sirt1 Expression is Associated with CD31 Expression in Blood Cells from Patients with Chronic Obstructive Pulmonary Disease

Overview

Journal Respir Res

Specialty Pulmonary Medicine

Date 2016 Oct 28

PMID 27784320

Citations 12

Authors

Ryo Kato

Shiro Mizuno

Maiko Kadowaki

Kohei Shiozaki

Masaya Akai

Ken Nakagawa

Taku Oikawa

Masaharu Iguchi

Kazuhiro Osanai

Takeshi Ishizaki

Norbert F Voelkel

Hirohisa Toga

Affiliations

Soon will be listed here.

Abstract

Background: Cigarette smoke induced oxidative stress has been shown to reduce silent information regulator 1 (Sirt1) levels in lung tissue from smokers and patients with COPD patients. Sirt1 is known to inhibit endothelial senescence and may play a protective role in vascular cells. Endothelial progenitor cells (EPCs) are mobilized into circulation under various pathophysiological conditions, and are thought to play an important role in tissue repair in chronic obstructive lung disease (COPD). Therefore, Sirt1 and EPC-associated mRNAs were measured in blood samples from patients with COPD and from cultured CD34 progenitor cells to examine whether these genes are associated with COPD development.

Methods: This study included 358 patients with a smoking history of more than 10 pack-years. RNA was extracted from blood samples and from CD34 progenitor cells treated with cigarette smoke extract (CSE), followed by assessment of CD31, CD34, Sirt1 mRNA, miR-34a, and miR-126-3p expression by real-time RT-PCR.

Results: The expression of CD31, CD34, Sirt1 mRNAs, and miR-126-3p decreased and that of miR-34a increased in moderate COPD compared with that in control smokers. However, no significant differences in these genes were observed in blood cells from patients with severe COPD compared with those in control smokers. CSE significantly decreased Sirt1 and increased miR-34a expression in cultured progenitor cells.

Conclusion: Sirt1 expression in blood cells from patients with COPD could be a biomarker for disease stability in patients with moderate COPD. MiR-34a may participate in apoptosis and/or senescence of EPCs in smokers. Decreased expression of CD31, CD34, and miR-126-3p potentially represents decreased numbers of EPCs in blood cell from patients with COPD.

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