Title:Sodium Selenite Modulates Global Activation of Proinflammatory M1-like
Macrophages, Necroinflammation and M1-like/M2-like Dichotomy at the
Onset of Human Type 1 Diabetes
Volume: 23
Issue: 8
Author(s): Mouna Nouar, Maroua Miliani, Imène Belhassena, Ahlam Fatmi and Mourad Aribi*
Affiliation:
- Laboratory of Applied Molecular Biology and Immunology, W0414100, University of Tlemcen, 13000, Tlemcen, Algeria
Keywords:
Extended extracellular activation spectrum, macrophage functional activities, immunomodulation, primary human M1-like monocyte-derived macrophages, sodium selenite treatment, type 1 diabetes.
Abstract:
Aim: The study aims to show that sodium selenite (Ss) would have an immunomodulatory
effect on the functional activity of proinflammatory macrophages (Mφs) during their extended
extracellular activation at the onset of human type 1 diabetes (T1D).
Background: Exacerbated activation of proinflammatory “M1” macrophages (Mφs) can promote
chronic local pancreatic islet inflammation and T1D development.
Objective: We investigated the ex vivo effects of Ss on the immune modulation of global/extended
activation of human proinflammatory M1-like Mφs.
Methods: Experiments were carried out on primary monocytes-derived Mφs (MDMs).
Results: The levels of IL-1β, TNF-α, H2O2 and intracellular free calcium ions (ifCa2+), and the ratios
of IL-1β-to-IL-10 and TNF-α-to-IL-10 were markedly increased in T1D Mφs than in healthy control
Mφs. Conversely, both IL-10 production and arginase 1 (ARG1) activity were downregulated in
T1D Mφs. Additionally, Ss treatment induced a marked downregulation of respiratory burst, ifCa2+
levels, M1-like Mφ-associated inducible nitric oxide (NO) synthase (iNOS) activity, cell necrosis
and related necroinflammation biomarkers, including IL-1β and TNF-α, CD14 expression, and the
ratios of iNOS-to-ARG1, IL-1β-to-IL-10, and TNF-α-to-IL-10. Moreover, Ss upregulated anti-inflammatory
“M2-like” Mφ activity as demonstrated by ARG1 activity and IL-10 production, as well
as phagocytosis capacity.
Conclusion: Ss exerts a potent immunomodulatory role on functional activities of human proinflammatory
T1D M1-like Mφs subjected to extended activation, as well as on the M1-like/M2-like
dichotomy. Additionally, the current study provides a novel therapeutic approach using Ss to promote
the anti-inflammatory function of Mφs at the onset of T1D.