星功能障碍,脱化和结节性炎症在死亡性脑膜炎中
bioRxiv : the preprint server for biology
|November 28, 2024
概括
狗的瘤性脑膜炎 (NME) 与GME不同的是,它显示出天体细胞功能和水素-4 (AQP4) 表达的减少. 这种与微质激活相关的天体细胞功能障碍驱动了NME的发病.
科学领域:
- 兽医神经学 兽医神经学
- 神经免疫学 神经免疫学
- 狗类病理学 狗类病理学
背景情况:
- 末性脑膜炎 (NME) 是年轻小品种狗的一种进展性神经炎症性疾病,通常被误诊为来源不明的脑膜炎 (MUO).
- 对NME病理生理学的有限理解阻碍了早期诊断和向治疗的发展.
- 区分MUO亚型对于提高诊断准确性和治疗结果至关重要.
研究的目的:
- 与粒状脑膜大脑炎 (GME) 相比,在NME中识别明显的炎症模式和神经病理变化.
- 为了研究星细胞功能的作用,特别是水素-4 (AQP4) 表达,在NME.
- 在NME中将炎症标记与神经病理学发现相关联.
主要方法:
- 在NME和GME病例中对免疫细胞透,星化,脱化和微质激活的比较分析.
- 在受影响的大脑区域评估AQP4表达水平.
- AQP4表达与微质和巨细胞激活的相关性.
主要成果:
- 与GME的突出B细胞聚合物相比,NME表现出轻微的勒普托门内尔免疫细胞透.
- 在NME的皮下白质中,脱素化比在GME中更严重.
- NME大脑显示减少了星质分裂和减少了AQP4表达,与微质/巨细胞激活相关.
结论:
- 星细胞功能障碍,以炎症区域AQP4表达减少为特征,是NME的关键驱动因素.
- 微质激活和随后的天体细胞功能障碍在NME病变发生过程中起着中心作用.
- 适应性免疫反应可能对NME的疾病过程产生次要贡献.
相关概念视频
01:18Viral Meningitis
Viral meningitis is the most common form of meningitis and is often referred to as aseptic meningitis to indicate the absence of bacterial involvement. It is generally milder than bacterial meningitis, with symptoms including fever, headache, stiff neck, drowsiness, nausea, photophobia, and vomiting. Rarely, more severe manifestations or death may occur. Common causative agents include enteroviruses, particularly coxsackie A and B viruses and echoviruses, all members of the Enterovirus genus...
01:25Arboviral Encephalitis
Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
01:22Bacterial Meningitis I: Introduction
Bacterial meningitis is a severe, life-threatening inflammation of the meninges, particularly the pia mater and arachnoid mater, affecting the subarachnoid space, ventricles, and cerebrospinal fluid (CSF). If untreated, it can lead to significant neurological complications or death.Causative AgentsCommon pathogens vary with age and immune status. In adults, major organisms include Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae. Streptococcus agalactiae (group B...
01:26Bacterial Meningitis II: Pathophysiology
Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...
01:19Encephalitis l: Introduction
Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...
01:26Encephalitis ll: Pathophysiology
Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...