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Kinetics of immunologic responses after primary MMR vaccination
H F Pabst1, D W Spady, M M Carson
1Department of Pediatrics, 2C3.00 Walter Mackenzie Centre, University of Alberta, Edmonton, Canada.
Abstract:
To study the kinetics of humoral as well as cellular immunity to measles and to test for associated immunosuppression 124 12 month old children were studied twice, before routine MMR and either 14, 22, 30, or 38 days after vaccination. Plaque reduction neutralization (PRN) titres were determined at these time points and lymphocytes were evaluated to identify changes in proportions of phenotype, their capacity to generate cytokines and to respond to blast transformation (BT) to measles hemagglutinin (HA), tetanus toxoid and Candida antigen. The PRN titre and BT to HA plateaued at 30 days and CD8+ and NK cells increased after immunization. Interleukin 2, 4, and 10 showed no significant changes. There was mild suppression of BT at 14 and 22 days post-immunization Interferon-gamma was the principal cytokine produced after primary measles immunization, suggesting primary measles immunization induces predominantly a TH1 type response.
Insights
Measles vaccination in 12-month-olds induces a T-helper 1 (TH1) immune response, with plaque reduction neutralization (PRN) and blast transformation (BT) peaking at 30 days. Some temporary suppression of BT was observed post-vaccination.
Area of Science:
- Immunology
- Vaccinology
Background:
- Measles vaccination is crucial for public health.
- Understanding the immune response kinetics post-MMR vaccination is essential.
Purpose of the Study:
- To investigate the temporal dynamics of humoral and cellular immunity following measles vaccination.
- To assess for any transient immunosuppression associated with the MMR vaccine.
Main Methods:
- Studied 124 children aged 12 months before and at multiple time points after MMR vaccination.
- Measured plaque reduction neutralization (PRN) titers and assessed lymphocyte blast transformation (BT) responses.
- Analyzed lymphocyte phenotypes, cytokine production (Interleukin 2, 4, 10, Interferon-gamma), and NK cell activity.
Main Results:
- PRN titers and BT to measles hemagglutinin (HA) plateaued by 30 days post-vaccination.
- CD8+ and NK cell populations increased post-immunization.
- Mild suppression of BT was noted at 14 and 22 days; Interferon-gamma was the dominant cytokine, indicating a TH1 response.
Conclusions:
- Primary measles immunization elicits a predominantly TH1-biased cellular immune response.
- The MMR vaccine induces measurable changes in immune cell populations and function.
- Transient immunosuppression of BT may occur early after vaccination.