概括
肌缩侧面硬化症 (ALS) 涉及上部和下部运动神经元退化. 这项研究发现,ALS患者的上部运动神经元轴突退化停止在脑干,这表明炎症触发了这一过程.
科学领域:
- 神经科学是一个神经科学.
- 病理学 病理学 病理学
- 遗传学 是一个遗传学.
背景情况:
- 肌缩侧面硬化症 (ALS) 是一种进展性神经退行性疾病,影响运动神经元.
- 连接上部运动神经元 (UMN) 和下部运动神经元 (LMN) 退化的精确机制,特别是在没有前性痴呆症 (FTD) 的非家族病例中,仍然不清楚.
- 在ALS中,焦点症状发作和性表明复杂的UMN和LMN参与.
研究的目的:
- 研究ALS患者UMN和LMN疾病之间的临床病理关系.
- 在疾病发作地点识别病理变化和分子途径.
- 阐明UMN退化与LMN病理学相关的模式.
主要方法:
- 10名ALS患者的临床病理相关性,使用详细的临床评估.
- 尸体后组织分析 (运动皮质,脑干,脊髓),对UMN/LMN标记物,髓,轴突,微质和pTDP43进行染色.
- 脊髓和脑髓的RNA测序,以确定丰富的途径.
主要成果:
- 在临床发病地点,LMN退化和微质激活最明显.
- 皮质脊髓管 (CST) 的UMN退化在脊髓层面和脑髓中是一致的.
- 在皮层运动神经元或它们的近端轴突中没有观察到UMN退化;pTDP43聚合物在UMN中不存在,但在LMN中存在.
- RNA测序突出了炎症途径,特别是在疾病发病地点.
结论:
- 没有FTD的ALS患者表现出UMN轴突的"死退",独立于发病地点,终结在脑干.
- 在这些ALS病例中,皮层运动神经元及其近端轴突被保留.
- LMN退化和相关的炎症可能会直接触发UMN轴突退化.
相关概念视频
Neurons: The Axon
7.4K
Axons are long, cytoplasmic processes of nerve cells capable of propagating electrical impulses known as action potentials. The cytoplasm or axoplasm of an axon contains neurofibrils, neurotubules, small vesicles, lysosomes, mitochondria, and various enzymes, all encased within the axolemma, the plasma membrane of the axon.
The axon attaches to the cell body at a cone-shaped elevation called the axon hillock. The initial part of the axon, closest to the hillock, is known as the initial segment....
The axon attaches to the cell body at a cone-shaped elevation called the axon hillock. The initial part of the axon, closest to the hillock, is known as the initial segment....
7.4K
Kubler Ross's Stages of Dying
1.3K
Elisabeth Kübler-Ross significantly advanced psychology's understanding of the process of dying with her influential book, On Death and Dying (1969). She focused on studying terminally ill individuals and outlined five stages commonly experienced when coping with death: denial, anger, bargaining, depression, and acceptance.
In denial, individuals reject the reality of their condition, often thinking, "This isn't true; I feel fine," as a way to protect themselves from...
In denial, individuals reject the reality of their condition, often thinking, "This isn't true; I feel fine," as a way to protect themselves from...
1.3K
Arteries of the Upper Limbs
2.4K
The subclavian artery transitions into the axillary artery as it exits the chest and enters the axillary region. This artery is critical for supplying blood to the shoulder area, including the head of the humerus, through the humeral circumflex arteries. As the vessel continues into the upper arm or brachium, it becomes the brachial artery. This artery plays a key role in vascularizing the brachial region and bifurcates at the elbow into several branches. These branches include the deep...
2.4K
Veins of Upper Limbs
4.3K
The human circulatory system, a marvel of biological engineering, is a complex network of vessels that transport blood throughout the body. Among these, the veins responsible for carrying blood from the upper limbs are divided into two categories: deep and superficial.
The deep venous system is primarily composed of the ulnar and radial veins. The ulnar vein, which drains the fingers through the superficial palmar venous arches, and the radial vein, which serves the palms via the deep palmar...
The deep venous system is primarily composed of the ulnar and radial veins. The ulnar vein, which drains the fingers through the superficial palmar venous arches, and the radial vein, which serves the palms via the deep palmar...
4.3K
Bones of the Upper Limb: Humerus
7.2K
The upper limb consists of the arm, forearm, wrist, and hand bones. The humerus is the single bone of the upper arm region. Proximally, it has a large, spherical, smooth head that articulates with the glenoid cavity of the scapula to form the glenohumeral or shoulder joint. The margin of the head is the anatomical neck, a residual epiphyseal plate. Laterally it extends to form bony projections called the greater tubercle and the lesser tubercle. Next to the tubercles is the surgical neck, a...
7.2K
Upper Respiratory Drugs: Decongestants
929
Decongestants are a class of medications used primarily to alleviate nasal congestion, a common symptom resulting from allergies, colds, sinusitis, and other upper respiratory tract infections. These drugs work by activating α-adrenergic receptors, constricting small blood vessels in the nasal membranes. This action results in the opening of clogged nasal passages, thereby facilitating sinus drainage and relieving congestion.
Most decongestants are readily available over-the-counter in...
Most decongestants are readily available over-the-counter in...
929


