AIMS Biophysics, 2019, 6(1): 23-38. doi: 10.3934/biophy.2019.1.23 Research article

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Influence of cholesterol on human calcitonin channel formation. Possible role of sterol as molecular chaperone

Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari “Aldo Moro”, via E. Orabona 4, 70126 Bari, Italy

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The interplay between lipids and embedded proteins in plasma membrane is complex. Membrane proteins affect the stretching or disorder of lipid chains, transbilayer movement and lateral organization of lipids, thus influencing biological processes such as fusion or fission. Membrane lipids can regulate some protein functions by modulating their structure and organization. Cholesterol is a lipid of cell membranes that has been intensively investigated and found to be associated with some membrane proteins and to play an important role in diseases. Human calcitonin (hCt), an amyloid-forming peptide, is a small peptide hormone. The oligomerization and fibrillation processes of hCt can be modulated by different factors such as pH, solvent, peptide concentration, and chaperones. In this work, we investigated the role of cholesterol in hCt incorporation and channel formation in planar lipid membranes made up of palmitoyl-oleoyl-phosphatidylcholine in which no channel activity had been found. The results obtained in this study indicate that cholesterol promotes hCt incorporation and channel formation in planar lipid membranes, suggesting a possible role of sterol as a lipid target for hCt.

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