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Published on: May 22, 2014
Effect of nickel sulfide on induction of interleukin-1 and phagocytic activity
1Department of Microbiology and Immunology, School of Medicine, University of Louisville, Kentucky 40292.
Insights
Crystalline nickel sulfide (NiS) impairs macrophage phagocytosis by affecting internalization, not binding or IL-1 production. This study reveals NiS as a potent immunomodulator impacting macrophage immune responses.
Area of Science:
- Immunology
- Toxicology
- Cell Biology
Background:
- Macrophages are key immune cells involved in phagocytosis and cytokine production.
- Nickel sulfide (NiS) is an environmental and industrial toxicant with potential immunomodulatory effects.
Purpose of the Study:
- To investigate the immunomodulatory effects of crystalline nickel sulfide (NiS) on rat peritoneal macrophages.
- To determine if NiS affects interleukin-1 (IL-1) production or phagocytosis of opsonized sheep red blood cells (SRBC).
Main Methods:
- Rat peritoneal macrophages were exposed to crystalline NiS.
- Macrophages were subsequently tested for IL-1 production.
- Phagocytosis of IgG-opsonized SRBC was assessed, examining both binding and internalization steps.
Main Results:
- NiS pretreatment did not alter IL-1 production by macrophages.
- NiS significantly inhibited the phagocytic activity of macrophages.
- The inhibition was specifically due to impaired internalization of SRBC, while binding remained unaffected.
- NiS did not affect Fc receptor-mediated interactions between SRBC and macrophages.
Conclusions:
- Crystalline NiS exhibits a potent immunomodulatory effect on macrophage phagocytic activity.
- NiS primarily affects the internalization phase of phagocytosis, suggesting a specific cellular mechanism of toxicity.
- These findings highlight the potential for NiS to disrupt crucial immune functions mediated by macrophages.
Abstract:
Rat peritoneal macrophages were treated with crystalline nickel sulfide (NiS), washed, and then tested for interleukin-1 (IL-1) production and phagocytosis of IgG-opsonized sheep red blood cells (SRBC). Pretreatment of peritoneal macrophages with crystalline NiS did not affect their ability to produce IL-1. In contrast, pretreatment of peritoneal macrophages with crystalline NiS inhibited the phagocytic activity of the peritoneal macrophage. This inhibitory activity was due to an effect on the internalization step of the phagocytic process. The binding step of this process was not affected by exposure to crystalline NiS. The overall number of Ig-SRBC that interacted with each macrophage was not different in treated or untreated cultures. This interaction is mediated through Fc receptors on the macrophage membrane. This result suggests that crystalline NiS does not modulate the expression of Fc receptors by peritoneal macrophages. The results described in this study suggest that crystalline NiS has a potent immunomodulatory effect on macrophage phagocytic activity.
