TY - JOUR T1 - Myeloid-related protein-14 deficiency promotes inflammation in staphylococcal pneumonia JF - European Respiratory Journal JO - Eur Respir J SP - 464 LP - 473 DO - 10.1183/09031936.00183814 VL - 46 IS - 2 AU - Ahmed Achouiti AU - Thomas Vogl AU - Anne J. Van der Meer AU - Ingrid Stroo AU - Sandrine Florquin AU - Onno J. de Boer AU - Johannes Roth AU - Sacha Zeerleder AU - Cornelis van ’t Veer AU - Alex F. de Vos AU - Tom van der Poll Y1 - 2015/08/01 UR - http://erj.ersjournals.com/content/46/2/464.abstract N2 - 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 1×107 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 nucleosomes.MRP8/14 serves in an unexpected protective role for the lung in staphylococcal pneumonia.MRP8/14 unexpectedly protects against excessive pulmonary inflammation in murine staphylococcal pneumonia http://ow.ly/IwYt6 ER -