Yan HF, Sun HW, Wang P, Zhang SL, Yang JW, Xu BX, Zhou JL, Li CL, Cui Y. Effect of lipopolysaccharide on proliferation, secretion and ultrastructure of murine liver Kupffer cells under high glucose conditions.
Shijie Huaren Xiaohua Zazhi 2017;
25:412-419. [DOI:
10.11569/wcjd.v25.i5.412]
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Abstract
AIM
To investigate the effect of lipopolysaccharide (LPS) on the proliferation, secretion and ultrastructure of liver Kupffer cells (KCs) under high glucose conditions.
METHODS
Murine liver KCs were cultured, amplified, and then randomly divided into a high glucose group [(HG), 25.0 mmol/L D-glucose], a normal glucose group [(CON), 11.1 mmol/L D-glucose], a LPS + high glucose group [(LPS-HG), 25.0 mmol/L D-glucose], and a LPS + normal glucose group [(LPS-CON), 11.1 mmol/L D-glucose)]. The KCs in each group were cultured for 24 h, and then LPS was added for the LPS-HG and LPS-CON groups. After 6 h of continuous cultivation, cell proliferation and cell cycle were detected by MTT colorimetric assay and flow cytometry, respectively. Cell supernatants were collected to determine the levels of tumor necrosis factor alpha (TNF-α), interleukin (IL)-1β and IL-6 by Luminex xMAP technique. The ultrastructure of KCs was observed by transmission electron microscopy (TEM).
RESULTS
MTT colorimetric assay showed that the optical density (OD) of murine liver KCs treated with LPS for 6 h under high glucose conditions increased significantly, but the OD values decreased significantly in the HG and LPS-HG groups compared with those of the CON and LPS-CON groups (P < 0.05). Flow cytometry revealed that high glucose arrested the cell cycle in G0/G1 phase; the percentage of G0/G1 phase cells decreased and that of S + G2/M phase cells increased significantly (P < 0.01) after KCs were treated with LPS for 6. The Luminex xMAP assay showed that the levels of TNF-α, IL-1β and IL-6 increased significantly after murine liver KCs were treated with LPS for 6 h under high glucose conditions, and the changes in TNF-α and IL-1β were more obvious. TEM revealed obvious ultrastructural alterations of KCs treated with LPS for 6 h under high glucose conditions. A large number of autophagosomes were observed in the LPS-HG group, and only few were noted in the HG group. Only vacuolar degenerations were visible in the CON and LPS-CON groups.
CONCLUSION
LPS can activate and enhance the proliferation and secretion of murine liver Kupffer cells under high glucose conditions. Both LPS and hyperglycemia can induce ultrastructural alterations of KCs including autophagy.
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