Impairment of Tissue Repair in Pneumonia Due to β-cell Deficiency: Role of Endoplasmic Reticulum Stress in Alveolar Macrophages

Overview

Journal BMC Res Notes

Publisher Biomed Central

Specialties Biology
General Medicine

Date 2019 Mar 24

PMID 30902065

Citations 1

Authors

Yoshiro Yamashita

Reiki Kuroki

Masahiro Takaki

Takeshi Tanaka

Masachika Senba

Konosuke Morimoto

Hideaki Amano

Affiliations

Soon will be listed here.

Abstract

Objective: Diabetes mellitus (DM) patients are susceptible to delayed resolution of pneumonia. However, the pathogenesis of the impaired tissue repair in inflamed lungs in diabetic patients is unknown. We evaluated phagocytosis of apoptotic cells (efferocytosis), hepatocyte growth factor (HGF) production in bronchoalveolar lavage fluid (BALF), and lung histology in the resolution phase following acute lung injury in streptozotocin (STZ)-induced β-cell-depleted hyperglycemic mice. We also investigated efferocytosis and HGF production by macrophages under β-cell depletion condition ex vivo.

Results: In β-cell-depleted mice, efferocytosis was not significantly different from that in control mice; however, the concentration of HGF in BALF was decreased. In addition, diminished HGF production by alveolar macrophages and DNA synthesis in the alveolar epithelium was observed by immunohistochemistry. Ex vivo experiments confirmed that HGF production by macrophages was impaired under β-cell depletion probably because of endoplasmic reticulum stress.

Citing Articles

Unraveling the role of macrophages in diabetes: Impaired phagocytic function and therapeutic prospects.

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Cigarette smoke induces endoplasmic reticulum stress and suppresses efferocytosis through the activation of RhoA.

Ito H, Yamashita Y, Tanaka T, Takaki M, Le M, Yoshida L Sci Rep. 2020; 10(1):12620.

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