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Effect of high glucose on human alveolar macrophage phenotype and phagocytosis of mycobacteria

Vance, Jesse; Santos, Andres; Sadofsky, Laura; Morice, Alyn; Cervantes, Jorge

Authors

Jesse Vance

Andres Santos

Dr Laura Sadofsky L.R.Sadofsky@hull.ac.uk
Lecturer in Respiratory Medicine/ Academic lead for postgraduate training in HYMS

Alyn Morice

Jorge Cervantes



Abstract

Purpose
Diabetes mellitus (DBM) reduces immunological activity and increases susceptibility to various infections, including tuberculosis (TB). Human alveolar macrophage (hAM) functions are altered in DBM.

Methods
To mimic hyperglycemic conditions in the lung alveolus, we co-cultured a hAM cell line (Daisy cell line) with human umbilical vein endothelial cells for 48 h in the presence of culture media alone, normal glucose (5 mM), and high glucose (22 mM). Using flow cytometry, immunophenotype characterization included cell surface markers CD 11c, CD14, CD16, CD86, CD163, CD169, CD206, CX3CR-1, CSF-1R, and matrix metalloproteinase-9 (MMP9). Phagocytic function was measured by immunofluorescence microscopy at 24 h after inoculation of cells with GFP-expressing Mycobacterium smegmatis.

Results
Direct exposure of AMs to high glucose and exposure in the co-culture system yield different results for the same phenotypic markers. MMP9 expression was increased under both conditions. CD169 and CX3CR1 expressions were decreased when AMs were exposed directly to high glucose but increased under co-culture. Immunofluorescence assay revealed that phagocytosis decreased in AMs when directly exposed to increased glucose levels from 2.5 mM to normal glucose (5 mM), yet AMs under co-culture did not show decreased phagocytosis until concentrations were raised to 25 mM.

Conclusion
Alteration in the expression of certain receptors may contribute to defective sentinel function of AMs, promoting susceptibility to TB in a diabetic host. Variability in cell surface marker expression under direct glucose exposure compared to exposure via co-culture reveals that cell signaling between endothelial cells and AMs may play a crucial role in the phenotypic expression of AMs.

Journal Article Type Article
Publication Date 2019-02
Journal Lung
Print ISSN 0341-2040
Electronic ISSN 1432-1750
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 197
Issue 1
Pages 89–94
APA6 Citation Vance, J., Santos, A., Sadofsky, L., Morice, A., & Cervantes, J. (2019). Effect of high glucose on human alveolar macrophage phenotype and phagocytosis of mycobacteria. Lung, 197(1), 89–94. doi:10.1007/s00408-018-0181-z
DOI https://doi.org/10.1007/s00408-018-0181-z
Keywords Diabetes; Alveolar macrophages; Tuberculosis; Mycobacteria
Publisher URL https://link.springer.com/article/10.1007%2Fs00408-018-0181-z

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