杯状细胞蛋白CLCA1的Rab7依赖调节调节了胃肠道平衡
Preksha Gaur1, Yesheswini Rajendran1, Bhagyashree Srivastava2
1Laboratory of Gut Inflammation and Infection Biology, Regional Centre for Biotechnology, Faridabad, India.
eLife
|April 9, 2024
概括
这项研究揭示了Rab7蛋白质.
科学领域:
- 胃肠病学 胃肠病学
- 细胞生物学 细胞生物学
- 微生物组研究 微生物组研究
背景情况:
- 性结肠炎的炎症仅限于远端肠道的粘膜层.
- 粘液屏障的破坏和微生物失生症先于结肠炎的发病.
- 囊泡贩运蛋白在结肠粘液调节中的作用尚不清楚.
研究的目的:
- 研究囊泡贩运蛋白Rab7在结肠粘液系统中的作用.
- 为了确定Rab7在结肠炎期间对粘膜平衡的影响.
主要方法:
- 在人类和小鼠结肠炎模型中评估了Rab7表达.
- 在体内使用Rab7敲击小鼠 (Rab7KD) 来研究粘液层完整性和微生物透性.
- 进行粘液蛋白质组学来分析成分,并确定了CLCA1的表达.
- 研究了Rab7通过溶酶体降解调节CLCA1水平的机制.
主要成果:
- 在人类和小鼠结肠炎期间,在杯状细胞中观察到Rab7表达的降低.
- Rab7KD小鼠表现出一个受损的粘液层,增加了微生物的透性,以及消耗了肠道微生物群.
- Rab7KD小鼠对德克斯硫酸诱导的大肠炎的敏感性增加.
- 粘液蛋白质学揭示了Rab7KD小鼠的蛋白酶CLCA1表达增加的变化组成.
- 发现Rab7通过调节它的溶酶体降解来控制CLCA1水平,这是大肠炎中受损的过程.
结论:
- 拉布7在维持结肠粘膜平衡中起着至关重要的作用.
- 对CLCA1分泌的Rab7依赖的控制对于粘液屏障的完整性至关重要.
- 通过Rab7介导的CLCA1调节失调有助于大肠炎的发病.
相关概念视频
Renewal of Intestinal Stem Cells
2.6K
The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
2.6K
GPCRs Regulate Adenylyl Cylase Activity
5.5K
Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
5.5K
Role Of Notch Signalling In Intestinal Stem Cell Renewal
2.1K
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
2.1K
Tight Junctions
5.3K
Tight junctions are molecular seals between cells that prevent the leaking of fluids, ions, and other small solutes across cavities and compartments in multicellular organisms. They are mainly composed of claudin and occludin transmembrane proteins, and other proteins such as tricellulin and JAM (junctional adhesion molecule). All these proteins are 4-pass transmembrane proteins, except JAM, which is a single-pass transmembrane protein belonging to the immunoglobulin superfamily. The...
5.3K
Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal
2.2K
Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
2.2K
Vesicular Tubular Clusters
2.5K
After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
With the help of motor proteins such...
With the help of motor proteins such...
2.5K


