Recall interferon-γ responses against Coccidioides are a surrogate marker for vaccine response in dogs.

IF 1.3 3区 农林科学 Q2 VETERINARY SCIENCES
Lisa F Shubitz, Daniel A Powell, Christine D Butkiewicz, Jeffrey A Frelinger, John N Galgiani
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Abstract

Objective: To develop an interferon γ (IFN-γ) recall assay to detect a T-cell response following vaccination because antibody is seldom detected in Δcps1-vaccinated dogs.

Methods: Peripheral blood mononuclear cells were collected from naturally infected dogs with a history of coccidioidomycosis or dogs from a nonendemic area. Two- to 5-month-old Beagles were vaccinated 2 to 4 times up to 28 days apart with live, avirulent Δcps1 and bled on study days 42, 68, or 90. Peripheral blood mononuclear cells were stimulated with Δcps1 and stained to detect CD4+ T-cell IFN-γ expression. The percentage of CD4+IFN-γ+ T cells compared to unstimulated baseline was calculated for each dog.

Results: All 5 naturally infected dogs with coccidioidomycosis had T-cell IFN-γ responses, and the 2 unexposed nonendemic dogs did not. Fourteen of 15 dogs vaccinated with Δcps1 had recall IFN-γ responses. Subcutaneously vaccinated dogs (n = 5) had a mean 1.85-fold increase in IFN-γ over baseline, whereas IM-vaccinated dogs (n = 10) were a mean of 6- to 10-fold higher. The percentage of CD4+IFN-γ+ cells was higher from restimulated cells compared to baseline in both SC- and IM-vaccinated dogs (SC twice [n = 5]: 95% CI, 0.001 to 0.543; IM twice [n = 5]: 95% CI, 0.9734 to 1.948; IM 4 times [n = 5]: 95% CI, 1.207 to 5.083).

Conclusions: The T-cell IFN-γ recall assay of peripheral blood mononuclear cells from vaccinated dogs detects a cell-mediated immune response to the Δcps1 vaccine.

Clinical relevance: This assay has potential utility as a surrogate marker for vaccine-induced immunity.

回想一下,对球虫的干扰素γ反应是狗疫苗反应的替代标志物。
目的:建立干扰素γ (IFN-γ)召回试验,以检测接种疫苗后的t细胞反应,因为在Δcps1-vaccinated犬中很少检测到抗体。方法:采集球虫菌病自然感染犬和非疫区犬的外周血单个核细胞。2到5个月大的小猎犬接种2到4次疫苗,间隔28天接种活的、无毒的Δcps1,并在研究的第42、68或90天出血。用Δcps1刺激外周血单核细胞,染色检测CD4+ t细胞IFN-γ的表达。计算每只狗的CD4+IFN-γ+ T细胞与未刺激基线的百分比。结果:5只自然感染球孢子菌病的犬均有t细胞IFN-γ反应,2只未暴露的非地方性犬无t细胞IFN-γ反应。接种Δcps1疫苗的15只狗中有14只有回忆性IFN-γ反应。皮下接种的狗(n = 5)的IFN-γ比基线平均增加1.85倍,而接种im的狗(n = 10)的IFN-γ平均高出6- 10倍。与基线相比,SC和im疫苗接种犬的CD4+IFN-γ+细胞百分比高于再刺激细胞(SC两次[n = 5]: 95% CI, 0.001至0.543;IM两次[n = 5]: 95% CI, 0.9734 ~ 1.948;IM 4次[n = 5]: 95% CI, 1.207 ~ 5.083)。结论:接种疫苗犬外周血单个核细胞的t细胞IFN-γ召回试验检测到细胞介导的对Δcps1疫苗的免疫应答。临床意义:该试验作为疫苗诱导免疫的替代标志物具有潜在的效用。
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来源期刊
CiteScore
1.70
自引率
10.00%
发文量
186
审稿时长
3 months
期刊介绍: The American Journal of Veterinary Research supports the collaborative exchange of information between researchers and clinicians by publishing novel research findings that bridge the gulf between basic research and clinical practice or that help to translate laboratory research and preclinical studies to the development of clinical trials and clinical practice. The journal welcomes submission of high-quality original studies and review articles in a wide range of scientific fields, including anatomy, anesthesiology, animal welfare, behavior, epidemiology, genetics, heredity, infectious disease, molecular biology, oncology, pharmacology, pathogenic mechanisms, physiology, surgery, theriogenology, toxicology, and vaccinology. Species of interest include production animals, companion animals, equids, exotic animals, birds, reptiles, and wild and marine animals. Reports of laboratory animal studies and studies involving the use of animals as experimental models of human diseases are considered only when the study results are of demonstrable benefit to the species used in the research or to another species of veterinary interest. Other fields of interest or animals species are not necessarily excluded from consideration, but such reports must focus on novel research findings. Submitted papers must make an original and substantial contribution to the veterinary medicine knowledge base; preliminary studies are not appropriate.
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