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Alteration of the erythrocyte membrane during Newcastle disease virus-induced hemolysis
Abstract:
In attempting to explain the mechanism whereby hemoglobin is released during NDV-induced hemolysis it was found that marker substances like albumin or myoglobin with diameters larger than 30 A are retained in the erythrocyte membrane, whereas low molecular weight material is released. This indicates that NDV-induced hemolysis does not result in the formation of membrane lesions but rather in the alteration of membrane permeability. A prerequisite for this process is the insertion of viral envelope components into the cell membrane. NDV-induced hemolysis can be enhanced by virus-specific antibodies and complement. In this case the release of marker substances is due to membrane lesions since large molecules also are released from the erythrocytes.
Insights
Newcastle disease virus (NDV) causes red blood cells to release small molecules by altering membrane permeability, not by creating lesions. This process is enhanced by antibodies and complement, leading to membrane damage and release of larger molecules.
Area of Science:
- Virology
- Cell Biology
- Immunology
Background:
- Newcastle disease virus (NDV) is known to induce hemolysis (red blood cell rupture).
- The precise mechanism of hemoglobin release during NDV-induced hemolysis has not been fully elucidated.
- Understanding membrane dynamics during viral infection is crucial for cell biology.
Purpose of the Study:
- To investigate the mechanism of hemoglobin release during NDV-induced hemolysis.
- To determine if NDV infection creates lesions in the erythrocyte membrane or alters its permeability.
- To explore the role of antibodies and complement in enhancing NDV-induced hemolysis.
Main Methods:
- Incubation of erythrocytes with NDV.
- Analysis of marker substance release (albumin, myoglobin) based on molecular size.
- Assessment of hemolysis in the presence and absence of virus-specific antibodies and complement.
Main Results:
- NDV-induced hemolysis initially involves the release of low molecular weight substances, while larger molecules (>30 A) are retained.
- This suggests an alteration of erythrocyte membrane permeability rather than the formation of membrane lesions.
- Hemolysis is significantly enhanced by virus-specific antibodies and complement, leading to the release of larger molecules, indicative of membrane lesions.
Conclusions:
- NDV-induced hemolysis primarily occurs through altered membrane permeability, not membrane lesions, under normal conditions.
- Viral envelope component insertion into the cell membrane is a prerequisite for this permeability change.
- Antibody- and complement-mediated enhancement of NDV-induced hemolysis results in significant membrane damage and lesion formation.