Mucosal adenovirus-vectored vaccine for measles

Liubov M Lobanova1, Tayyba T Baig, Suresh K Tikoo

  • 1Vaccine and Infectious Disease Organization, University of Saskatchewan, 120 Veterinary Road, Saskatoon, SK, S7N 5E3 Canada.

Vaccine
|October 5, 2010
PubMed

Insights

A new single-shot measles vaccine (Ad-F/H) delivered intranasally effectively generates measles virus (MV)-specific antibodies and protects against MV replication, even in the presence of pre-existing antibodies.

Area of Science:

  • Virology
  • Vaccinology
  • Immunology

Background:

  • Existing measles vaccines face challenges, necessitating improved single-shot alternatives.
  • A need exists for a measles vaccine effective via mucosal administration and functional despite pre-existing neutralizing antibodies.

Purpose of the Study:

  • To develop a novel single-shot anti-measles vaccine.
  • To evaluate the efficacy of a recombinant adenovirus-vectored vaccine (Ad-F/H) administered via mucosal (intranasal) and intramuscular routes.
  • To assess vaccine functionality in the presence of anti-measles neutralizing antibodies.

Main Methods:

  • Construction of two recombinant human adenoviruses (Ad-F/H) encoding measles virus (MV) fusion (F) and hemagglutinin (H) proteins.
  • Vaccination of mice and cotton rats via intranasal or intramuscular routes.
  • Measurement of MV-specific serum neutralizing antibodies and IgA titers.
  • Challenge studies to assess protection against MV replication in lungs.

Main Results:

  • Intranasal or intramuscular Ad-F/H vaccination induced high MV-specific serum neutralizing-antibody titers in mice and cotton rats.
  • Intranasal vaccination led to a 100-fold increase in MV-specific IgA titers in mice compared to intramuscular vaccination.
  • Intranasal Ad-F/H administration completely protected cotton rats from MV lung replication, while intramuscular administration did not.

Conclusions:

  • The Ad-F/H vaccine is a promising candidate for a single-shot measles vaccine.
  • Intranasal administration elicits robust mucosal immunity (IgA) and superior protection against MV replication.
  • This vaccine strategy shows potential for overcoming challenges associated with current measles vaccines.