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Renal Tubule and Collecting Duct01:24

Renal Tubule and Collecting Duct

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The renal tubule is divided into three parts: the proximal convoluted tubule (PCT), the Loop of Henle (LOH), and the distal convoluted tubule (DCT).
Proximal Convoluted Tubule (PCT):
The PCT is the initial segment of the renal tubule, extending from the Bowman's capsule that encloses the glomerulus. Its convoluted structure and microvilli-lined cells increase the surface area for reabsorption. The PCT reabsorbs glucose, amino acids, sodium, and water from the filtrate, ensuring essential...
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Reabsorption and Secretion in the DCT and Collecting Duct01:26

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The early phase of the DCT manages the reabsorption of approximately 10-15% of filtered water, 5–10% of filtered sodium, and 5–10% of filtered chloride. This process is facilitated by Na+–Cl− symporters in apical membranes and sodium-potassium pumps, as well as Cl− leakage channels in basolateral membranes. The early DCT also stands out as a site where parathyroid hormone (PTH) stimulates calcium reabsorption, depending on the body's requirements.
The distal...
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Testes: Histology01:27

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A tough, fibrous membrane, the tunica albuginea, covers the testes, extending inward to form fibrous partitions or septa, dividing them into internal compartments called lobules. Each lobule has 1 to 3 tightly coiled seminiferous tubules where sperm production occurs. These tubules merge into a tubular network at the back of the testis, known as the rete testis. It connects to 15 to 20 efferent ductules, leading to the epididymis.
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Diphtheria01:28

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Diphtheria is an acute, toxin-mediated infectious disease that primarily affects the upper respiratory tract. It is caused by Corynebacterium diphtheriae, a Gram-positive, pleomorphic rod that lacks spore-forming capability and exhibits a characteristic club-shaped morphology under microscopic examination. While C. diphtheriae can asymptomatically colonize mucosal surfaces, clinical disease manifests only when the bacterial strain is lysogenized by a specific β-corynephage. This phage...
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Hepatitis01:25

Hepatitis

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Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver.
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Obtaining Highly Purified Toxoplasma gondii Oocysts by a Discontinuous Cesium Chloride Gradient
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人类D型环林

Y Xiong1, T Connolly, B Futcher

  • 1Howard Hughes Medical Institute, Cold Spring Harbor Laboratory, New York 11724.

Cell
|May 17, 1991
PubMed
概括
此摘要是机器生成的。

研究人员从人类质母细胞瘤细胞中发现了一种新型基因,cyclin D1. 这种环素D1基因及其蛋白质产物在癌细胞系中高度表达,这表明它可能在质母细胞瘤的发展中发挥作用.

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Ex vivo Culture of Drosophila Pupal Testis and Single Male Germ-line Cysts: Dissection, Imaging, and Pharmacological Treatment
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科学领域:

  • 分子生物学分子生物学
  • 细胞循环规则 细胞循环规则
  • 癌症遗传学 癌症遗传学

背景情况:

  • 环素是细胞循环的关键调节剂,已知子类包括A,B和CLN型环素.
  • 人类质母细胞瘤是一种高度侵略性的脑瘤,表现出细胞循环控制的失调.
  • 了解新型细胞循环调节剂对于破译癌症机制至关重要.

研究的目的:

  • 用酵母中的功能屏幕识别参与细胞循环调节的新型基因.
  • 描述一种新发现的环素基因,称为环素D1,从人类质母细胞瘤细胞系中分离出来.

主要方法:

  • 人类质母细胞瘤cDNA库的构建.
  • 在芽酵母 (Saccharomyces cerevisiae) 菌株中进行功能查,该菌株具有特定的细胞周期突变 (缺乏CLN1和CLN2,有条件缺少CLN3).
  • 基因救援和孤立基因的特征,包括转录分析.

主要成果:

  • 一个新型的基因,被指定为cyclin D1,已成功从质母细胞瘤cDNA库中获取.
  • 旋D1表现出已知旋的序列同质性,但代表了一个独特的子类.
  • 循环素D1基因通过替代多化产生两个主要的转录,转录及其34 kDa的蛋白质产物都在起源的质母细胞瘤细胞系中丰富.

结论:

  • 循环素D1代表了一个新的循环素子类.
  • 在质母细胞瘤细胞中林D1的高含量表明它可能参与这些癌细胞的增殖.
  • 对cyclin D1的功能进行进一步的研究可能会揭示质母细胞瘤的新治疗点.