Characteristic pro-inflammatory cytokines and host defence cathelicidin peptide produced by human monocyte-derived macrophages infected with Neospora caninum. 2018

E Boucher, and M Marin, and R Holani, and M Young-Speirs, and D M Moore, and E R Cobo
Bachelor of Health Sciences, Cumming School of Medicine, University of Calgary,Calgary,Canada.

Neospora caninum is a coccidian intracellular protozoan capable of infecting a wide range of mammals, although severe disease is mostly reported in dogs and cattle. Innate defences triggered by monocytes/macrophages are key in the pathogenesis of neosporosis, as these cells are first-line defenders against intracellular infections. The aim of this study was to characterize infection and innate responses in macrophages infected with N. caninum using a well-known cell model to study macrophage functions (human monocyte THP-1 cells). Intracellular invasion of live tachyzoites occurred as fast as 4 h (confirmed with immunofluorescence microscopy using N. caninum-specific antibodies). Macrophages infected by N. caninum had increased expression of pro-inflammatory cytokines (TNFα, IL-1β, IL-8, IFNγ). Interestingly, N. caninum induced expression of host-defence peptides (cathelicidins), a mechanism of defence never reported for N. caninum infection in macrophages. The expression of cytokines and cathelicidins in macrophages invaded by N. caninum was mediated by mitogen-activated protein kinase (MEK 1/2). Secretion of such innate factors from N. caninum-infected macrophages reduced parasite internalization and promoted the secretion of pro-inflammatory cytokines in naïve macrophages. We concluded that rapid invasion of macrophages by N. caninum triggered protective innate defence mechanisms against intracellular pathogens.

UI MeSH Term Description Entries
D007113 Immunity, Innate The capacity of a normal organism to remain unaffected by microorganisms and their toxins. It results from the presence of naturally occurring ANTI-INFECTIVE AGENTS, constitutional factors such as BODY TEMPERATURE and immediate acting immune cells such as NATURAL KILLER CELLS. Immunity, Native,Immunity, Natural,Immunity, Non-Specific,Resistance, Natural,Innate Immune Response,Innate Immunity,Immune Response, Innate,Immune Responses, Innate,Immunity, Non Specific,Innate Immune Responses,Native Immunity,Natural Immunity,Natural Resistance,Non-Specific Immunity
D008264 Macrophages The relatively long-lived phagocytic cell of mammalian tissues that are derived from blood MONOCYTES. Main types are PERITONEAL MACROPHAGES; ALVEOLAR MACROPHAGES; HISTIOCYTES; KUPFFER CELLS of the liver; and OSTEOCLASTS. They may further differentiate within chronic inflammatory lesions to EPITHELIOID CELLS or may fuse to form FOREIGN BODY GIANT CELLS or LANGHANS GIANT CELLS. (from The Dictionary of Cell Biology, Lackie and Dow, 3rd ed.) Bone Marrow-Derived Macrophages,Monocyte-Derived Macrophages,Macrophage,Macrophages, Monocyte-Derived,Bone Marrow Derived Macrophages,Bone Marrow-Derived Macrophage,Macrophage, Bone Marrow-Derived,Macrophage, Monocyte-Derived,Macrophages, Bone Marrow-Derived,Macrophages, Monocyte Derived,Monocyte Derived Macrophages,Monocyte-Derived Macrophage
D003048 Coccidiosis Protozoan infection found in animals and man. It is caused by several different genera of COCCIDIA. Besnoitiasis,Besnoitiosis,Besnoitiases,Besnoitioses,Coccidioses
D003593 Cytoplasm The part of a cell that contains the CYTOSOL and small structures excluding the CELL NUCLEUS; MITOCHONDRIA; and large VACUOLES. (Glick, Glossary of Biochemistry and Molecular Biology, 1990) Protoplasm,Cytoplasms,Protoplasms
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000074084 THP-1 Cells A human leukemia monocytic cell line derived from a patient with LEUKEMIA, MONOCYTIC, ACUTE. It is used as a model to study the function of MONOCYTES and MACROPHAGES, their signaling pathways, nutrient and drug transport. THP-1 Cell Line,Cell Line, THP-1,Cell Lines, THP-1,Cell, THP-1,Cells, THP-1,THP 1 Cell Line,THP 1 Cells,THP-1 Cell,THP-1 Cell Lines
D016207 Cytokines Non-antibody proteins secreted by inflammatory leukocytes and some non-leukocytic cells, that act as intercellular mediators. They differ from classical hormones in that they are produced by a number of tissue or cell types rather than by specialized glands. They generally act locally in a paracrine or autocrine rather than endocrine manner. Cytokine
D054804 Cathelicidins Antimicrobial cationic peptides with a highly conserved amino terminal cathelin-like domain and a more variable carboxy terminal domain. They are initially synthesized as preproproteins and then cleaved. They are expressed in many tissues of humans and localized to EPITHELIAL CELLS. They kill nonviral pathogens by forming pores in membranes. ALL-38 Peptide,Antibacterial Peptide LL-37,Antimicrobial Peptide LL-37,Bac4 Protein, Bos taurus,CAP18 Lipopolysaccharide-Binding Protein,CATH-1 Protein,Cathelicidin,Cathelicidin 1,Cathelicidin Antimicrobial Peptide,Cathelicidin LL-37,Cathelicidin-1,Cathelin-Like Protein,Cathelin-Related Antimicrobial Peptide,LL-37 Antibacterial Peptide,LL-37 Peptide,Myeloid Cathelicidin 1 Protein, Equus caballus,Ropocamptide,eCATH-1,hCAP-18,CAP-18,CAP18,FA-LL-37,K9CATH,eCATH-1 protein, Equus caballus,ALL 38 Peptide,Antibacterial Peptide LL 37,Antibacterial Peptide, LL-37,Antimicrobial Peptide LL 37,Antimicrobial Peptide, Cathelin-Related,CAP 18,CAP18 Lipopolysaccharide Binding Protein,CATH 1 Protein,Cathelicidin LL 37,FA LL 37,LL 37 Antibacterial Peptide,LL 37 Peptide,LL-37, Antibacterial Peptide,LL-37, Antimicrobial Peptide,LL-37, Cathelicidin,Lipopolysaccharide-Binding Protein, CAP18,Peptide LL-37, Antibacterial,Peptide LL-37, Antimicrobial,Peptide, ALL-38,Peptide, Cathelin-Related Antimicrobial,Peptide, LL-37,Peptide, LL-37 Antibacterial,Protein, CAP18 Lipopolysaccharide-Binding,Protein, CATH-1,Protein, Cathelin-Like,eCATH 1,eCATH 1 protein, Equus caballus,hCAP 18
D018688 Neospora A genus of protozoan parasites of the subclass COCCIDIA. Its species are parasitic in dogs, cattle, goats, and sheep, among others. N. caninum, a species that mainly infects dogs, is intracellular in neural and other cells of the body, multiplies by endodyogeny, has no parasitophorous vacuole, and has numerous rhoptries. It is known to cause lesions in many tissues, especially the brain and spinal cord as well as abortion in the expectant mother. Neospora caninum,Neospora caninums,Neosporas,caninums, Neospora
D019950 Mitogen-Activated Protein Kinase 1 A proline-directed serine/threonine protein kinase which mediates signal transduction from the cell surface to the nucleus. Activation of the enzyme by phosphorylation leads to its translocation into the nucleus where it acts upon specific transcription factors. p40 MAPK and p41 MAPK are isoforms. Extracellular Signal-Regulated Kinase 2,MAP Kinase 2,Mitogen-Activated Protein Kinase 2,p42 MAP Kinase,p42 MAPK,p42(Mitogen-Activated Protein Kinase),MAPK1 Mitogen-Activated Protein Kinase,MAPK2 Mitogen-Activated Protein Kinase,p42(Mapk),p42(Mapk) Kinase,Extracellular Signal Regulated Kinase 2,MAP Kinase, p42,MAPK1 Mitogen Activated Protein Kinase,MAPK2 Mitogen Activated Protein Kinase,Mitogen Activated Protein Kinase 1,Mitogen Activated Protein Kinase 2

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