Related Experiment Video
Updated: May 24, 2026
13:09
Mass Spectrometric Analysis of Glycosphingolipid Antigens
Published on: April 16, 2013
Glycosphingolipid synthesis is essential for MDCK cell differentiation
Lucila G Pescio1, Nicolás O Favale, María G Márquez
1Cátedra de Biología Celular y Molecular, Departamento de Ciencias Biológicas, Facultad de Farmacia, y Bioquímica, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires (C1113AAD), Argentina.
Biochimica Et Biophysica Acta
|March 6, 2012
Summary
Hypertonicity induces Madin-Darby Canine Kidney (MDCK) cell differentiation by increasing glycosphingolipid (GSL) synthesis. GSLs are crucial for apical membrane development and primary cilium formation in these cells.
Area of Science:
- Cell Biology
- Biochemistry
- Physiology
Background:
- Glycosphingolipids (GSLs) are vital membrane components, especially in polarized epithelial cells.
- Their role in hypertonicity-induced cell differentiation is not fully understood.
Purpose of the Study:
- To investigate how hypertonicity affects MDCK cell differentiation.
- To elucidate the role of GSLs in this process.
Main Methods:
- MDCK cells were exposed to hypertonic conditions.
- GSL synthesis was inhibited using D-PDMP or siRNA against glucosylceramide synthase.
- Enzymatic pathways for GSL synthesis were inhibited.
Main Results:
- Hypertonicity increased GSL synthesis in MDCK cells.
- GSL depletion impaired apical membrane development and primary cilium formation.
- A specific ceramide pool from the salvage pathway, involving Fumonisin B1-resistant ceramide synthase, was identified as a precursor.
Conclusions:
- Extracellular hypertonicity drives MDCK cell differentiation via a sphingolipid metabolic program.
- GSLs are essential for apical membrane domain development and primary cilium formation.
- The salvage pathway contributes to ceramide production for GSL synthesis during hypertonic stress.
Related Concept Videos
01:26Biosynthesis of Polysaccharides
Polysaccharides such as glycogen and starch are synthesized from nucleoside diphosphate sugars, primarily uridine diphosphate glucose (UDPG) and adenosine diphosphate glucose (ADPG). These activated glucose donors act as key intermediates in carbohydrate metabolism and biosynthesis. UDPG primarily involves glycogen synthesis in animals and many bacteria, while ADPG plays a fundamental role in starch synthesis in plants and certain bacteria.UDPG is formed when glucose-1-phosphate reacts with...
01:27Synthesis of Phosphatidylcholine in the ER Membrane
The ER synthesizes lipids for building cell membranes and performing cellular functions such as energy storage and signaling. The lipid synthesis machinery embedded in the ER membrane primarily collects all reactants from the cytosol. Following synthesis, the secretory pathway and the ER contact sites distribute these lipids to other cellular organelles. Additionally, the energy-rich triacylglycerides are transported from the ER via lipid droplets.
The major components of all eukaryotic cell...
The major components of all eukaryotic cell...
01:29Biosynthesis of Lipids
Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis pathway, which...
01:24Oligosaccharide Assembly
Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
Multiple sugar molecules that may or may...
Multiple sugar molecules that may or may...
01:32Membrane Lipids
Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...