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Related Concept Videos

Cranial and Spinal Meninges01:19

Cranial and Spinal Meninges

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The cranial and spinal meninges are complex protective structures surrounding the central nervous system (CNS), consisting of the brain and spinal cord. These meninges consist of the dura mater, the arachnoid mater, and the pia mater. They protect the CNS, provide structural support, and aid in circulating cerebrospinal fluid (CSF).
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A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
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Bacterial Signaling01:30

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In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
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Related Experiment Video

Updated: Jan 21, 2026

Humanized Mouse Model to Study Bacterial Infections Targeting the Microvasculature
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Humanized Mouse Model to Study Bacterial Infections Targeting the Microvasculature

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Targeting the complement system in bacterial meningitis.

Diederik L H Koelman1, Matthijs C Brouwer1, Diederik van de Beek1

  • 1Amsterdam UMC, University of Amsterdam, Department of Neurology, Amsterdam Neuroscience, Meibergdreef 9, AZ, Amsterdam, The Netherlands.

Brain : a Journal of Neurology
|August 3, 2019
PubMed
Summary
This summary is machine-generated.

Bacterial meningitis inflammation is driven by the complement system. Targeting C5a offers a promising therapeutic strategy for treating this severe public health threat.

Keywords:
bacterial meningitiscomplement C5acomplement systemexperimental modelstherapeutics

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Isolating Central Nervous System Tissues and Associated Meninges for the Downstream Analysis of Immune cells
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Area of Science:

  • Immunology
  • Neuroscience
  • Infectious Diseases

Background:

  • Bacterial meningitis, primarily caused by Streptococcus pneumoniae and Neisseria meningitidis, remains a significant public health concern.
  • The severe outcomes of meningitis are largely attributed to an excessive and uncontrolled host inflammatory response.
  • The complement system plays a critical role in mediating and sustaining this detrimental inflammation.

Purpose of the Study:

  • To comprehensively review the role of the complement system in bacterial meningitis pathogenesis.
  • To evaluate the potential of targeting complement components, specifically C5a, as a therapeutic strategy.
  • To assess the implications of complement-targeted therapies on disease severity and treatment outcomes.

Main Methods:

  • Analysis of genetic variation studies related to complement components.
  • Measurement of complement levels in cerebrospinal fluid (CSF) and blood.
  • Review of experimental models (murine pneumococcal meningitis) and patient data.
  • Evaluation of therapeutic strategies targeting C5 conversion, C5a, and its receptor C5aR.

Main Results:

  • Accumulation of neutrophils in CSF during pneumococcal meningitis is primarily driven by C5-derived chemotaxis, correlating with disease severity.
  • Experimental treatment with C5 antibodies in murine models demonstrated prevention of brain damage and mortality.
  • Emerging therapeutics target C5 conversion, C5a, or C5aR, showing therapeutic potential.

Conclusions:

  • The complement anaphylatoxin C5a is identified as a key mediator of inflammation and a promising therapeutic target in bacterial meningitis.
  • While C5 inhibition shows promise, potential risks include impaired bacterial clearance due to inhibition of the membrane attack complex.
  • Targeting C5a or C5aR specifically offers a more refined approach, warranting further clinical investigation, including Phase 2 trials.