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Published on: August 11, 2014
MARCKS Inhibition Alters Bovine Neutrophil Responses to Salmonella Typhimurium
Haleigh E Conley1,2, Chalise F Brown1, Trina L Westerman3
1Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA.
Abstract:
Neutrophils are innate immune cells that respond quickly to sites of bacterial infection and play an essential role in host defense. Interestingly, some bacterial pathogens benefit from exuberant neutrophil inflammation. Salmonella is one such pathogen that can utilize the toxic mediators released by neutrophils to colonize the intestine and cause enterocolitis. Because neutrophils can aid gut colonization during Salmonella infection, neutrophils represent a potential host-directed therapeutic target. Myristoylated alanine-rich C-kinase substrate (MARCKS) is an actin-binding protein that plays an essential role in many neutrophil effector responses. We hypothesized that inhibition of MARCKS protein would alter bovine neutrophil responses to Salmonella Typhimurium (STm) ex vivo. We used a MARCKS inhibitor peptide to investigate the role of MARCKS in neutrophil responses to STm. This study demonstrates that MARCKS inhibition attenuated STm-induced neutrophil adhesion and chemotaxis. Interestingly, MARCKS inhibition also enhanced neutrophil phagocytosis and respiratory burst in response to STm. This is the first report describing the role of MARCKS protein in neutrophil antibacterial responses.
Insights
Inhibiting Myristoylated alanine-rich C-kinase substrate (MARCKS) in neutrophils altered responses to Salmonella Typhimurium. MARCKS inhibition reduced adhesion and chemotaxis but enhanced phagocytosis and respiratory burst.
Area of Science:
- Immunology
- Microbiology
- Cell Biology
Background:
- Neutrophils are key innate immune cells crucial for combating bacterial infections.
- Certain pathogens, like Salmonella, exploit neutrophil inflammation for colonization and pathogenesis.
- Neutrophils' role in Salmonella infection makes them a potential target for host-directed therapies.
Purpose of the Study:
- To investigate the role of Myristoylated alanine-rich C-kinase substrate (MARCKS) in bovine neutrophil responses to Salmonella Typhimurium (STm).
- To determine if inhibiting MARCKS affects neutrophil functions during STm infection.
Main Methods:
- Utilized a specific MARCKS inhibitor peptide.
- Ex vivo analysis of bovine neutrophils exposed to STm.
- Assessed neutrophil adhesion, chemotaxis, phagocytosis, and respiratory burst.
Main Results:
- MARCKS inhibition significantly attenuated STm-induced neutrophil adhesion and chemotaxis.
- Conversely, MARCKS inhibition enhanced neutrophil phagocytosis of STm.
- MARCKS inhibition also boosted the respiratory burst activity of neutrophils against STm.
Conclusions:
- This study is the first to describe the role of MARCKS protein in neutrophil antibacterial responses.
- MARCKS is a critical regulator of neutrophil effector functions against Salmonella Typhimurium.
- Targeting MARCKS may offer a novel host-directed therapeutic strategy against Salmonella infections.
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