This is a prospective, single-site, randomized, then open-label study designed to develop a detailed transcriptional and epigenetic profile of the immune response to pneumococcal vaccination with conjugated and non-conjugated polysaccharide vaccines in the senescent immune system of older adults. In this study, 40 healthy adults ages 60 and older that have never received pneumococcal vaccination, will be randomized in a 1:1 ratio to receive Prevnar-13 (Pfizer), a conjugated 13-valent vaccine or Pneumovax 23 (Merck), a non-conjugated 23-valent vaccine. Following randomized assignment of vaccine, the study will be open-label. Six (6) study visits will occur over about 70 days, with an optional 7th visit for participants to receive a second vaccination with the other pneumococcal vaccine one to two years after randomization. Participants will provide blood samples for transcriptional, epigenetic and biological analyses pre- and post-vaccination.
This prospective, single-site, randomized, then open-label study is designed to develop a detailed transcriptional and epigenetic profile of the immune response to pneumococcal vaccination with conjugated and non-conjugated polysaccharide vaccines in the senescent immune system of older adults. This knowledge may lead to development of more effective vaccines through increased understanding of the effects of immunosenescence on mechanisms of immune response to pneumococcal vaccination in older adults elderly. Forty (40) healthy adults ages 60 and older that have never received pneumococcal vaccination, will be randomized in a 1:1 ratio to receive Prevnar-13 (Pfizer), a conjugated 13-valent vaccine or Pneumovax 23 (Merck), a non-conjugated 23-valent vaccine. Following randomized assignment of vaccine, the study will be open-label. The study sample will be drawn from the population of healthy older participants in the catchment area of UConn Health in Farmington, CT. The first six (6) study visits are planned to occur over 67 days at Days -7, 0, 1, 10, 28 (±3 d) and 60 (± 5d). Participants will provide blood samples for transcriptional, epigenetic and biological analyses pre- and post-vaccination. One to two years after receiving the randomly-assigned vaccination, participants may opt to receive administration of a second pneumococcal vaccine with the vaccine that they did not receive by random assignment at Visit 2 (Day 0). This second vaccine will be provided at no charge to the participant. Administration of this vaccine will occur at an optional Visit 7 for participants who choose to receive the second vaccine and will be scheduled at the participant's convenience one-two years after receiving the first pneumococcal vaccine. If the participant opts to receive the second vaccine within the study and attends optional Visit 7, blood samples for genomic and biologic analysis will be collected at the visit.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
40
One to two years after receiving the randomly-assigned vaccination, participants may opt to receive administration of a second pneumococcal vaccine with Pneumovax 23
One to two years after receiving the randomly-assigned vaccination, participants may opt to receive administration of a second pneumococcal vaccine with Prevnar-13
UConn Center On Aging
Farmington, Connecticut, United States
Pneumococcal-specific Antibody Responses
To vaccinate healthy older participants with pneumococcal vaccines, collect longitudinal blood samples and assess pneumococcal-specific antibody responses. The unit of measurement used is log2 titer defined as a measure to quantify the overall strength of responses using the sum of all serotype responses. Data shown below is from longitudinal study timepoints (pre and post) first pneumococcal vaccine. At study endpoint, Visit 7, a second pneumococcal vaccine was administered and no further sample collection visits were conducted as proposed in the study design.
Time frame: 70 days
Pneumococcal-specific Antibody Responses - Fold Change Post First Vaccination
Fold change between the baseline and post first vaccination titers was calculated for each pneumococcal vaccine cohort. Data shown below is from longitudinal study timepoints (pre and post) first pneumococcal vaccine. At study endpoint, Visit 7, a second pneumococcal vaccine was administered and no further sample collection visits were conducted as proposed in the study design.
Time frame: 70 days
Number of Genes Upregulated Following Vaccination With PCV13 or PPSV23
RNA-seq and ATAC-seq to enable quantitative assessment of both coding RNA's and ncsRNA's as well as to resolve the epigenetic landscape of immune cells in the context of vaccine responses. We assessed the number of genes upregulated post first vaccination \[PCV13 or PPSV23\]. Data shown below is from longitudinal study timepoints (pre and post) first pneumococcal vaccine. At study endpoint, Visit 7, a second pneumococcal vaccine was administered and no further sample collection visits were conducted as proposed in the study design.
Time frame: 10 days post first vaccination
Alterations to APCs, Tfh Cells or B Cells in Response to PCV13 and PPSV23
Measure of functional status of immune cells in older participants following administration of a single pneumococcal vaccine, Prevnar13 or Pneumovax23, at baseline and 10 days post first vaccination. Data shown below is from longitudinal study timepoints (pre and post) first pneumococcal vaccine. At study endpoint, Visit 7, a second pneumococcal vaccine was administered and no further sample collection visits were conducted as proposed in the study design.
Time frame: baseline and 10 days post first vaccination
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