Related Experiment Video
Updated: Dec 28, 2025
06:11
Culturing Primary Rat Inner Medullary Collecting Duct Cells
Published on: June 21, 2013
15.1K
Aquaporin regulation: Lessons from secretory vesicles
1Department of Physiology, Wayne State University School of Medicine, Detroit, MI, United States.
Vitamins and Hormones
|February 17, 2020
Summary
Secretory vesicle swelling, essential for cell secretion, involves aquaporins (water channels). Research reveals how these channels are regulated by various cellular components, including receptors and ion channels.
Area of Science:
- Cell Biology
- Membrane Transport
- Molecular Physiology
Background:
- Secretory vesicle swelling is a critical step in cellular secretion.
- The molecular mechanisms governing this swelling have been a focus of research for over two decades.
Purpose of the Study:
- To elucidate the molecular mechanisms underlying secretory vesicle swelling.
- To understand the regulation of aquaporins at the secretory vesicle membrane.
Main Methods:
- Studies utilized live cells, isolated secretory vesicles, and single vesicle electrophysiology.
- Reconstituted swelling complexes in liposomes were also employed.
- Investigated the role of specific signaling molecules and ion channels.
Main Results:
- Aquaporins (water channels) were identified as key players in rapid water transport into secretory vesicles, driving swelling.
- Identified the involvement of β-adrenergic receptors, GαI proteins, phospholipase A2 (PLA2), and potassium and chloride channels.
- These components regulate aquaporin activity at the secretory vesicle membrane.
Conclusions:
- Aquaporin-mediated water transport is fundamental to secretory vesicle swelling.
- A complex interplay of receptors, G-proteins, enzymes, and ion channels governs aquaporin regulation in this process.
More Related Videos
08:08Monitoring the Effect of Osmotic Stress on Secretory Vesicles and Exocytosis
Published on: February 19, 2018
8.9K
11:42Reconstitution of a Transmembrane Protein, the Voltage-gated Ion Channel, KvAP, into Giant Unilamellar Vesicles for Microscopy and Patch Clamp Studies
Published on: January 22, 2015
19.7K
Related Concept Videos
01:25Aquaporins
6.0K
Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
6.0K
01:26Reabsorption and Secretion in the DCT and Collecting Duct
2.8K
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...
The distal...
2.8K
01:33Overview of Secretory Vesicles
9.2K
Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
9.2K
01:22Physiology of the Genitourinary System II: Tubular Reabsorption and Secretion
824
The kidneys maintain homeostasis through filtration, reabsorption, and secretion. Tubular reabsorption and secretion are crucial in forming urine and regulating electrolytes, water balance, and waste elimination.Tubular Reabsorption and Secretion ProcessesTubular reabsorption is the process that reclaims essential substances such as electrolytes, glucose, amino acids, and water from the glomerular filtrate back into the bloodstream. This is achieved through passive and active transport...
824
01:45Endocrine Signaling
67.5K
Endocrine cells produce hormones to communicate with remote target cells found in other organs. The hormone reaches these distant areas using the circulatory system. This exposes the whole organism to the hormone but only those cells expressing hormone receptors or target cells are affected. Thus, endocrine signaling induces slow responses from its target cells but these effects also last longer.
67.5K
01:30ATP Driven Pumps III: V-type Pumps
4.5K
V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
4.5K