Immune responses to human cytomegalovirus (HCMV) infection in immunocompetent hosts present paradoxes with potentially devastating ramifications for those without immune competency. The long quest for a protective HCMV vaccine has been impeded by multiple factors, including two contradictions about HCMV natural history. (1) HCMV is considered to be a virus with low disease potential in immunocompetent hosts. Yet, the virus efficiently maintains a lifelong persistence in the presence of those immune responses that limit clinical outcomes. A hallmark of HCMV persistence is the reactivation of latent viral genomes and shedding of virus. Horizontal transmission represents an infectious threat to those at-risk for primary HCMV infection, particularly fetuses borne by mothers without prior HCMV immunity. Accumulating evidence highlights another ambiguity about HCMV immunity. (2) The immune responses to HCMV generated during primary and long-term infection, which protect against viral sequelae, are incompletely protective against reinfection with horizontally transmitted virions. It is well- established that women with prior immunity can be reinfected with antigenic variants of HCMV that can then be transmitted to their fetuses. This proposal hypothesizes that there is a key nexus linking virus-host interactions, persistence, and reinfection that is susceptible to vaccine- mediated intervention. Specifically, HCMV modulation of host immunity through the functionality of the HCMV-encoded interleukin-10 protein (cmvIL10), enables both viral reactivation and systemic spread of virions beyond sites of reinfection. HYPOTHESIS: post-exposure increases of neutralizing antibody (NAb) titers to cmvIL10 in HCMV-infected individuals will (1) reduce HCMV shedding and (2) increase resistance to reinfection. This study extends our work on the in vitro functionality of cmvIL10 and the in vivo modulation of host immunity by rhesus CMV (RhCMV)-encoded IL-10 (rhcmvIL10).
Aim 1) Quantification of RhCMV shedding in RhCMV- infected monkeys following immunization with functionally inactive rhcmvIL10.
Aim 2) Comparison of RhCMV reinfection in RhCMV-immune monkeys that differ in their NAb titers to rhcmvIL10.
Aim 3) Characterization of rhcmvIL-10-induced alterations to host immunity.
The goal of this proposal is the shift the paradigm for the prevention of congenital HCMV infection by expanding the target population for an HCMV vaccine beyond just women without preconceptional HCMV immunity. Targeting those who shed virus to reduce shedding and also targeting those women with preconceptional immunity to reduce reinfection would greatly reduce the rate of congenital infection.
|Kuruganti, Srilalitha; Miersch, Shane; Deshpande, Ashlesha et al. (2016) Cytokine Activation by Antibody Fragments Targeted to Cytokine-Receptor Signaling Complexes. J Biol Chem 291:447-61|
|Zhang, Mingce; Bracaglia, Claudia; Prencipe, Giusi et al. (2016) A Heterozygous RAB27A Mutation Associated with Delayed Cytolytic Granule Polarization and Hemophagocytic Lymphohistiocytosis. J Immunol 196:2492-503|
|Khass, Mohamed; Blackburn, Tessa; Burrows, Peter D et al. (2016) VpreB serves as an invariant surrogate antigen for selecting immunoglobulin antigen-binding sites. Sci Immunol 1:|
|Oxford, Kristie L; Dela Pena-Ponce, Myra Grace A; Jensen, Kara et al. (2015) The interplay between immune maturation, age, chronic viral infection and environment. Immun Ageing 12:3|
|Barry, Peter A (2015) Exploiting viral natural history for vaccine development. Med Microbiol Immunol 204:255-62|
|Kubagawa, Hiromi; Kubagawa, Yoshiki; Jones, Dewitt et al. (2014) The old but new IgM Fc receptor (Fc?R). Curr Top Microbiol Immunol 382:3-28|
|Eberhardt, Meghan K; Barry, Peter A (2014) Pathogen manipulation of cIL-10 signaling pathways: opportunities for vaccine development? Curr Top Microbiol Immunol 380:93-128|
|Deere, Jesse D; Barry, Peter A (2014) Using the nonhuman primate model of HCMV to guide vaccine development. Viruses 6:1483-501|
|Kuruganti, Srilalitha; Accavitti-Loper, Mary Ann; Walter, Mark R (2014) Production and characterization of thirteen human type-I interferon-? subtypes. Protein Expr Purif 103:75-83|
|Walter, Mark R (2014) The molecular basis of IL-10 function: from receptor structure to the onset of signaling. Curr Top Microbiol Immunol 380:191-212|
Showing the most recent 10 out of 11 publications