Abstract
Cerebrovascular complications are common in pneumococcal meningitis and are a main determinant of unfavourable outcome and death. We hypothesized that plasminogen activator inhibitor-1 (PAI-1) is a major contributor to cerebrovascular complications and death in pneumococcal meningitis. In a nationwide prospective cohort study we evaluated the effect of the 4G/5G polymorphism (rs1799889) in SERPINE1 (coding for PAI-1) on cerebrovascular complications and outcome in adults with pneumococcal meningitis proven by cerebrospinal fluid (CSF) culture. From 2006 to 2011, a total of 991 adult patients with community-acquired bacterial meningitis were included in the cohort and 712 had pneumococcal meningitis. The rs1799889 5G/5G genotype was associated with an increased risk of unfavourable outcome [odds ratio (OR) 1.69, 95 % confidence interval (CI) 1.03–2.78] and mortality (OR 2.20, 95 % CI 1.02–4.86) in white adults with pneumococcal meningitis. rs1799889 was associated with CSF PAI-1 concentrations (P = 0.048), and white patients homozygous for the low PAI-1 producing genotype (5G/5G) had a significantly higher risk for cerebral infarctions (P = 0.015) and haemorrhages (P = 0.005). Subsequently, we assessed the functionality of PAI-1 in a pneumococcal meningitis mouse model, using Serpine1 knockout mice. Consistent with the human data, Serpine1-deficient mice had increased mortality and cerebral haemorrhages compared to wild-type mice. We conclude PAI-1 is protective for death in humans and mice with pneumococcal meningitis by reducing cerebrovascular complications.
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Acknowledgments
We thank Barbara Angele and Judith Houben for technical support, and all Dutch physicians participating in the MeninGene study. This study has been funded by grants from the European Society of Clinical Microbiology and Infectious Diseases (ESCMID Research Grant 2011 to MB), European Federation of Neurological Sciences (EFNS Scientific Fellowship 2011 to MB), Netherlands Organization for Health Research and Development (ZonMw; NWO-Veni Grant 2012 [916.13.078] to MB; NWO-Veni Grant 2006 [916.76.023], NWO-Vidi Grant [016.116.358] to DB), the Academic Medical Centre (AMC Fellowship 2008 to DB), and the European Research Council (ERC Starting Grant 2011 to DB).
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D. van de Beek and U. Koedel contributed equally.
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Brouwer, M.C., Meijers, J.C.M., Baas, F. et al. Plasminogen activator inhibitor-1 influences cerebrovascular complications and death in pneumococcal meningitis. Acta Neuropathol 127, 553–564 (2014). https://doi.org/10.1007/s00401-013-1216-4
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DOI: https://doi.org/10.1007/s00401-013-1216-4