A cell is not an island. Each one has a host of ways to detect its surroundings, and even physically reach out to neighbors or enemies using strange cellular appendages.
, and a new study has given us more insight into how they allow our cells to move about, by twisting the skeleton-like inner scaffolding."These structures play a pivotal role in .. allowing cells to explore their environment, generate mechanical forces, perform chemical signaling, or convey signals via intercellular tunneling nano-bridges,""The dynamics of filopodia appear quite complex as they exhibit a rich behavior of buckling, pulling, length and shape changes.
Said core is composed of proteins called actin and myosin. The team, led by biophysicists from the Niels Bohr Institute in Denmark, compares this newly discovered twisting and buckling motion to a rubber band. When twisted, a rubber band is contracted and suddenly can move on its own, springing back to its original, untwisted configuration. Within the cores of filopodia, myosin proteins coil around actin proteins, pulling them into twists or buckles. The resulting movement allows cell 'tentacles' to sense their environment, interact with other cells or microorganisms, and even move about.
"They're able to bend – twist, if you will – in a way that allows them to explore the entire space around the cell, and they can even penetrate tissues in their environment,"The team used optical tweezers and a confocal microscope to physically watch this actin and myosin shaft twist; afterwards, they built a physical model to confirm that the movement arose spontaneously from these molecules being confined in narrow channels within the filopodia.
The researchers used a variety of cells to confirm this wasn't a one-off phenomenon – looking at everything from
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