ADSORPTION OF INFLUENZA HEMAGGLUTININS AND VIRUS BY RED BLOOD CELLS

Area of Science:

• Virology
• Immunology
• Biochemistry

Background:

• Influenza hemagglutinins are key viral surface proteins responsible for binding to host cells.
• Understanding the interaction between influenza virus and red blood cells is crucial for virological studies.

Purpose of the Study:

• To investigate the kinetics and conditions affecting the adsorption and elution of influenza hemagglutinins on chicken red blood cells.
• To determine the fate of the infectious influenza virus during this adsorption-elution process.

Main Methods:

• Mixing influenza virus preparations with chicken red blood cells under varying conditions (temperature, cell concentration, time).
• Measuring hemagglutinin adsorption and elution using agglutination assays.
• Assessing the infectivity of the virus in the supernatant after interaction with red blood cells.

Main Results:

• Influenza hemagglutinins rapidly adsorb to chicken red blood cells and subsequently elute, with kinetics dependent on temperature and red blood cell concentration.
• Higher temperatures accelerate hemagglutinin elution, while increased red blood cell concentration enhances adsorption and reduces elution.
• Chicken red blood cells that have undergone adsorption and elution are no longer capable of binding fresh hemagglutinins or causing agglutination.
• The infectious influenza virus is simultaneously adsorbed by red blood cells and then gradually released.

Conclusions:

• The adsorption-elution of influenza hemagglutinins by chicken red blood cells is a dynamic process influenced by environmental factors.
• This interaction effectively removes infectious influenza virus from suspension, although the virus is later re-released.
• The red blood cell receptors for hemagglutinin remain functional even after heat treatment, indicating their stability.