相关实验视频

Updated: Jul 8, 2026

Intraductal Injection of LPS as a Mouse Model of Mastitis: Signaling Visualized via an NF-κB Reporter Transgenic

Intraductal Injection of LPS as a Mouse Model of Mastitis: Signaling Visualized via an NF-κB Reporter Transgenic

Published on: September 4, 2012

当地和全身免疫细胞种群的动力学在长期感染牛乳腺的黄金葡萄球菌在活跃的侵入过程中

Carolina Engler^1,2, Silvana Pirola^1,2, Camila Beccaria^1,2

¹Laboratorio de Biología Celular y Molecular Aplicada, Instituto de Ciencias Veterinarias del Litoral (ICIVET-Litoral), Universidad Nacional del Litoral (UNL)/Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Santa Fe, Argentina.

The Journal of dairy research

|October 15, 2025

概括

牛的慢性金黄色葡萄球菌乳内感染 (IMI) 在进化过程中改变了免疫细胞的分布. 受感染的奶牛显示血液CD14+细胞增加,但乳腺CD8+和CD21+细胞减少,影响局部免疫力.

科学领域:

兽医免疫学兽医免疫学
牛乳腺炎研究牛乳腺炎研究
天生的和适应性的免疫力.

背景情况:

由金黄色葡萄球菌引起的牛乳内感染 (IMI) 可以变得慢性,在发育过程中影响乳腺健康.
发育过程中的免疫细胞动态对于乳腺恢复和未来的哺乳期至关重要.
了解局部和全身免疫应对慢性黄金杆菌IMI对于有效的乳腺炎管理至关重要.

研究的目的:

为了研究免疫细胞群 (CD14+,CD4+,CD8+,CD21+) 在乳腺分泌物和血液中的动力学,在牛慢性S. aureus IMI.
为了比较感染和未感染的四分之一和全身循环之间的免疫细胞分布.

主要方法:

分析乳腺分泌物和血液样本从奶牛和没有慢性金黄色S.IMI在活跃的卷积期间.
使用流细胞计量来量化CD14+,CD4+,CD8+和CD21+免疫细胞的百分比.
感染和未感染群体之间的免疫细胞群体在干燥后的不同时间点的统计比较.

主要成果:

与未感染的奶牛相比,S. aureus感染的奶牛的血液中CD14+细胞的百分比较高,但乳腺分泌物较低.
感染季度的乳腺分泌物中CD8+细胞的百分比显著下降.
在特定时间点,受感染动物/四分之一的血液和乳腺分泌物中,CD21+细胞的百分比下降.

结论:

慢性S. aureus IMI导致循环中的CD14+细胞增加,可能被保留在乳腺组织内,而不是迁移到分泌物中.
虽然CD4+和CD8+淋巴细胞水平在系统上相似,但乳腺分泌物中的CD8+细胞保留表明局部免疫反应.
感染乳腺分泌物中减少的CD21+淋巴细胞可能会损害局部幽默免疫力,损害腺体的防御能力.

关键词:

黄金葡萄球菌黄金葡萄球菌活跃的进化是积极的进化.牛乳腺炎是一种牛乳腺炎.慢性感染慢性感染免疫细胞种群免疫细胞种群

更多相关视频

A Mouse Model to Assess Innate Immune Response to Staphylococcus aureus Infection

A Mouse Model to Assess Innate Immune Response to Staphylococcus aureus Infection

Published on: February 28, 2019

Development and Assessment of Intracellular Infection Models for Staphylococcus aureus

Development and Assessment of Intracellular Infection Models for Staphylococcus aureus

Published on: January 17, 2025

相关概念视频

Clinical Significance of Antibiotic Resistance

Clinical Significance of Antibiotic Resistance

Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...

Acute Inflammation III: Local and Systemic Effects

Acute Inflammation III: Local and Systemic Effects

Acute inflammation produces a coordinated set of local and systemic changes that limit injury, eliminate pathogens, and initiate repair. These responses arise within minutes of infection, trauma, or chemical insult and are driven by vascular alterations and leukocyte-derived mediators. When the stimulus resolves, the reaction typically abates within days.Local EffectsAt the site of injury, arteriolar vasodilation increases blood flow, resulting in redness and warmth. Simultaneously, increased...

Chronic Inflammation: Introduction

Chronic Inflammation: Introduction

Chronic inflammation is a prolonged, dysregulated immune response that persists for weeks to years when the inciting stimulus is difficult to eradicate or when self‑antigens drive ongoing reactivity. Morphologically, it is defined by mononuclear cell infiltration, progressive tissue destruction, and concurrent attempts at healing via angiogenesis and fibrosis. Compared with acute inflammation, edema is less prominent while cellular infiltration predominates; triggers include persistent...