Streptococcus pneumoniae Translocates into the Myocardium and Forms Unique Microlesions That Disrupt Cardiac Function

PLoS Pathogens

Jose A. Lorent¹  Andres Esteban¹  Pablo Cardinal¹  Rosario Granados¹  Jane S. Hankins²  Jonathan Giardina³  Elaine I. Tuomanen³  Beth Mann³  Jessica Humann³  Geli Gao³  Martha Hanes⁴  Marcos I. Restrepo⁵  Carlos J. Orihuela⁶  Armand O. Brown⁶  Merry L. Lindsey⁷  Kyle I. Happel⁸  Steve Nelson⁸  Gregory J. Bagby⁸  Claude J. LeSaux⁹  Ganesh V. Halade^1,10  Eric M. Mortensen^1,11  Paola Faverio^1,12 

[1] CIBER de Enfermedades Respiratorias, Hospital Universitario de Getafe, Madrid, Spain;Dept. of Hematology, St. Jude Children's Research Hospital, Memphis, Tennessee, United States of America;Dept. of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, United States of America;Dept. of Laboratory Animal Resources. University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America;Dept. of Medicine, South Texas Veterans Health Care System and University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America;Dept. of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America;Dept. of Physiology and Biophysics University of Mississippi Medical Center, Jackson, Mississippi, United States of America;Dept. of Physiology and Section of Pulmonary/Critical Care Medicine. Louisiana State University Health Sciences Center, New Orleans, Louisiana, United States of America;Division of Cardiology, Dept. of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America;Division of Cardiovascular Disease, Dept. of Medicine, The University of Alabama at Birmingham, Birmingham, Alabama, United States of America;Medical Service, Veterans Affairs North Texas Health Care System and Dept. of Internal Medicine and Clinical Sciences, University of Texas Southwestern Medical Center, Dallas, Texas, United States of America;University of Milan Bicocca and Dept. of Respiratory Medicine, San Gerardo Hospital, Monza, Italy

关键词: Pneumococcus;    Heart;    Immune cells;    Macaque;    Blood;    Cell walls;    Electrocardiography;    Antibodies;   

DOI  :  10.1371/journal.ppat.1004383

学科分类：生物科学（综合）

来源: Public Library of Science

【 摘 要 】

Hospitalization of the elderly for invasive pneumococcal disease is frequently accompanied by the occurrence of an adverse cardiac event; these are primarily new or worsened heart failure and cardiac arrhythmia. Herein, we describe previously unrecognized microscopic lesions (microlesions) formed within the myocardium of mice, rhesus macaques, and humans during bacteremic Streptococcus pneumoniae infection. In mice, invasive pneumococcal disease (IPD) severity correlated with levels of serum troponin, a marker for cardiac damage, the development of aberrant cardiac electrophysiology, and the number and size of cardiac microlesions. Microlesions were prominent in the ventricles, vacuolar in appearance with extracellular pneumococci, and remarkable due to the absence of infiltrating immune cells. The pore-forming toxin pneumolysin was required for microlesion formation but Interleukin-1β was not detected at the microlesion site ruling out pneumolysin-mediated pyroptosis as a cause of cell death. Antibiotic treatment resulted in maturing of the lesions over one week with robust immune cell infiltration and collagen deposition suggestive of long-term cardiac scarring. Bacterial translocation into the heart tissue required the pneumococcal adhesin CbpA and the host ligands Laminin receptor (LR) and Platelet-activating factor receptor. Immunization of mice with a fusion construct of CbpA or the LR binding domain of CbpA with the pneumolysin toxoid L460D protected against microlesion formation. We conclude that microlesion formation may contribute to the acute and long-term adverse cardiac events seen in humans with IPD.

【 授权许可】

CC BY