Myeloid-related protein-14 deficiency promotes inflammation in staphylococcal pneumonia

The European Respiratory Journal
Ahmed AchouitiTom van der Poll

Abstract

Staphylococcus aureus has evolved as an important cause of pneumonia in both hospital and community settings. Staphylococcal lung infection can lead to overwhelming pulmonary inflammation. During infection, neutrophils release complexes of myeloid-related protein (MRP)8 and MRP14 (MRP8/14). MRP8/14 has been shown to exert pro-inflammatory and chemotactic activity, and to assist in the killing of S. aureus. In the current study we sought to determine the role of MRP8/14 in the host response during S. aureus pneumonia.Pneumonia was induced in wildtype and MRP14-deficient mice (mice unable to form MRP8/14) by intranasal inoculation of 1×10(7) CFU of S. aureus USA300. Mice were sacrificed at 6, 24, 48 or 72 h after infection for analyses.S. aureus pneumonia was associated with a strong rise in MRP8/14 in bronchoalveolar lavage fluid and lung tissue. Surprisingly, MRP14 deficiency had a limited effect on bacterial clearance and was associated with increased cytokine levels in bronchoalveolar lavage fluid and aggravated lung histopathology. MRP14 deficiency in addition was associated with a diminished transmigration of neutrophils into bronchoalveolar lavage fluid at late time-points after infection together with reduced release of n...Continue Reading

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Citations

Mar 23, 2018·The Journal of Immunology : Official Journal of the American Association of Immunologists·Scott J DenstaedtBenjamin H Singer
Jan 12, 2017·Immunology and Cell Biology·Yuka HiroshimaCarolyn L Geczy
Nov 23, 2017·Canadian Respiratory Journal : Journal of the Canadian Thoracic Society·Kubra AykacSevgen Tanir Basaranoglu
Jun 27, 2018·Frontiers in Immunology·Siwen WangJian Ma
Oct 5, 2017·American Journal of Respiratory and Critical Care Medicine·Kevin C MaAugustine M K Choi
Jun 3, 2021·Children·Grigorios Chatziparasidis, Ahmad Kantar
Jun 8, 2021·Infection and Immunity·Karen F JohnstoneMark C Herzberg

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