Immunization to Reduce Genital and Neonatal Herpes

免疫接种可减少生殖器和新生儿疱疹

• 批准号: 7788638
• 负责人: Nigel Bourne
• 金额: $ 20.4万
• 依托单位: UNIVERSITY OF TEXAS MED BR GALVESTON
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-02-01 至 2010-01-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7788638
• 关键词: Accounting; Adjuvant; Animals; Antibodies; Antigens; Antiviral Agents; Belief; Cavia; Clinical; Clinical Research; Clinical Trials; Controlled Clinical Trials; DNA; DNA Vaccines; Development; Disease; Doctor of Philosophy; Emulsions; Evaluation; Exposure to; Female; Frequencies; Future; Genital system; Glycoproteins; Health; Herpes Simplex Virus Vaccines; Human; Human Herpesvirus 2; Immune response; Immunity; Immunization; Incidence; Infection; Infection prevention; Latent Virus; Latent virus infection phase; Letters; MF59; Measures; Modeling; Mucous Membrane; Mus; Neonatal; Oils; Pathogenesis; Pharmacotherapy; Proteins; Recurrence; Recurrent disease; Reporting; Research Design; Risk; Role; Sensory Ganglia; Simplexvirus; Site; Surface; System; Treatment Protocols; Vaccinated; Vaccine Clinical Trial; Vaccines; Virus; Virus Diseases; Virus Replication; Virus Shedding; Water; Woman; aluminum sulfate; chiron vaccine; genital herpes; genital infection; genital secretion; glycoprotein D-herpes simplex virus type 2; improved; latent infection; monophosphoryl lipid A; mouse model; pathogen; preclinical evaluation; prevent; reactivation from latency; research study; response; transmission process; trend; vaccine efficacy

DESCRIPTION (provided by applicant): The control of genital herpes will require widespread use of effective vaccines. However, if herpes simplex virus (HSV) vaccines do not achieve sterilizing immunity (prevent virus replication at the entry site) the virus will establish latency, rendering the host potentially contagious during reactivation, and allowing continued transmission. While animal studies with a variety of vaccines show that immunization does not prevent virus replication in the genital mucosa following high titer challenge, a HSV type 2 glycoprotein D vaccine protected 39-46% of seronegative women against infection in a recent clinical Trial. Since much of the spread of genital herpes occurs during periods of asymptomatic shedding when relatively little virus is present, we believe that the protection resulted because immunization increased the virus inoculum required to infect the genital mucosa. In Aim 1 we will explore this hypothesis by determining the effect of immunization with the clinical study vaccine on the virus inoculum required to infect the genital mucosa in a mouse model. In Aim 2 we will again use the threshold of infection to measure efficacy and determine whether DNA prime glycoprotein boost improves protection compared to DNA or glycoprotein only immunization. These studies are relevant because an effective vaccine will need to induce T helper type 1 (Th1) responses in addition to antibody and DNA vaccine priming with protein boosting has been shown to increase Th1 responses compared to protein only immunization. While a vaccine that increases the threshold of infection will reduce the incidence of transmission, it will not provide universal protection. In Aim 3 we will use conditions that overcome protection from infection to examine the impact of immunization on the magnitude of latent infection and recurrent disease (both clinical recurrences and virus shedding into the genital tract). These studies will provide new information about the risks of transmission from immunized hosts who become infected. Taken together, the studies in this proposal will yield new information about the capacity of HSV vaccines to reduce the spread of genital herpes. These study designs may become standard for preclinical evaluation of HSV vaccines.

描述（由申请人提供）：生殖器疱疹的控制将需要广泛使用有效的疫苗。然而，如果单纯疱疹病毒（HSV）疫苗不能达到杀菌免疫（防止病毒在进入部位复制），病毒将建立潜伏期，使宿主在重新激活期间具有潜在的传染性，并允许继续传播。虽然各种疫苗的动物研究表明，免疫接种不能阻止高滴度攻击后生殖器粘膜中的病毒复制，但在最近的临床试验中，HSV 2型糖蛋白D疫苗保护了39-46%的血清阴性女性免受感染。 由于生殖器疱疹的大部分传播发生在无症状的脱落期间，此时病毒相对较少，我们认为这种保护是因为免疫增加了感染生殖器粘膜所需的病毒接种物。在目的1中，我们将通过确定临床研究疫苗免疫对小鼠模型中感染生殖器粘膜所需的病毒接种物的影响来探索这一假设。在目的2中，我们将再次使用感染阈值来测量功效，并确定与仅DNA或糖蛋白免疫相比，DNA初免糖蛋白加强免疫是否改善保护。这些研究是相关的，因为有效的疫苗除了抗体外还需要诱导辅助性T细胞1型（Th 1）应答，并且与仅蛋白质免疫相比，DNA疫苗用蛋白质加强引发已显示出增加Th 1应答。 虽然提高感染阈值的疫苗会降低传播发生率，但它不会提供普遍保护。在目标3中，我们将使用克服感染保护的条件来检查免疫接种对潜伏感染和复发性疾病（临床复发和病毒进入生殖道）的影响。这些研究将提供关于从免疫宿主感染的传播风险的新信息。总之，本提案中的研究将产生关于HSV疫苗减少生殖器疱疹传播能力的新信息。这些研究设计可能成为HSV疫苗临床前评价的标准。