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Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models00:57

Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models

Physiological pharmacokinetic models, often called flow-limited or perfusion models, typically assume a swift drug distribution between tissue and venous blood, creating a rapid drug equilibrium. This premise is based on the idea that drug diffusion is extremely fast, and the cell membrane presents no barrier to drug permeation. In this scenario, where no drug binding occurs, the drug concentration in the tissue equals that of the venous blood leaving the tissue. This greatly simplifies the...

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Updated: Jun 4, 2026

A Novel In vitro Model for Studying the Interactions Between Human Whole Blood and Endothelium
06:27

A Novel In vitro Model for Studying the Interactions Between Human Whole Blood and Endothelium

Published on: November 21, 2014

Whole-blood model.

C A Ison1

  • 1Department of Infectious Diseases ⇐p; Microbiology, Imperial College School of Medicine, London, UK.

Methods in Molecular Medicine
|February 22, 2011
PubMed
Summary
This summary is machine-generated.

Neisseria meningitidis can be harmless or cause disease. Immunity to serogroup B infections relies on outer-membrane proteins and phagocytosis, as its capsular polysaccharide is non-immunogenic.

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Area of Science:

  • Microbiology
  • Immunology
  • Pathogen Research

Background:

  • Neisseria meningitidis is a human pathogen that can be commensal or invasive.
  • Immunity to serogroup A and C is mediated by antibodies to capsular polysaccharide (CPS).
  • Serogroup B's CPS is non-immunogenic due to resemblance to host moieties, necessitating alternative immunity mechanisms.

Purpose of the Study:

  • To investigate alternative mechanisms of immunity against Neisseria meningitidis serogroup B infections.
  • To explore the role of outer-membrane proteins (OMPs) in host defense.
  • To understand the significance of cellular defense mechanisms like phagocytosis.

Main Methods:

  • Analysis of bacterial cell envelope components.
  • Investigation of host immune responses.
  • Studies on phagocytic activity against Neisseria meningitidis.

Main Results:

  • Capsular polysaccharide (CPS) of serogroup B is non-immunogenic.
  • Outer-membrane proteins (OMPs) are implicated in immunity.
  • Phagocytosis plays a role in host defense against serogroup B.

Conclusions:

  • Immunity to Neisseria meningitidis serogroup B infections is not dependent on CPS antibodies.
  • Outer-membrane proteins and phagocytosis are key components of the immune response.
  • Further research into OMPs and phagocytosis is crucial for developing serogroup B vaccines.