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Signal transduction without signal: Receptor clusters can direct cell movement

Clustering of receptors can have the same effect as binding a signaling molecule -- receptor clusters can direct cell movement

Date:
February 25, 2021
Source:
Goethe University Frankfurt
Summary:
Whether we smell, taste or see, or when adrenaline rushes through our veins, all of these signals are received by our cells via a specific group of receptor proteins called G protein-coupled receptors, which transmit signals to the inside of the cell. Biochemists have now discovered that such receptors can also produce signals even in the absence of an external stimulus: For certain receptors clustering is apparently sufficient.
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Our body consists of 100 trillion cells that communicate with each other, receive signals from the outside world and react to them. A central role in this communication network is attributed to receiver proteins, called receptors, which are anchored at the cell membrane. There, they receive and transmit signals to the inside of the cell, where a cell reaction is triggered.

In humans, G protein-coupled receptors (GPC receptors) represent the largest group of these receptor molecules, with around 700 different types. The research of the Frankfurt and Leipzig scientists focused on a GPC receptor that serves as a receptor for the neuropeptide Y in cells and is accordingly called the Y2 receptor. Neuropeptide Y is a messenger substance that primarily mediates signals between nerve cells, which is why Y2 receptors are mainly present in nerve cells and among other activities trigger the formation of new cell connections.

In the laboratory, the researchers engineered cells, which had approx. 300,000 Y2 receptors on their surface and were grown on specifically developed, light-sensitive matrices. Each of the Y2 receptors was provided with a small molecular "label." Once the scientists created a spot of light with a fine laser beam on the cell surface, the Y2 receptor under this spot were trapped via the molecular label to the exposed matrix in such a way that the Y2 receptors moved closely together to form an assembly known as a cluster. The whole reaction could be immediately observed at the defined spot and within a few seconds.

Professor Robert Tampé from the Institute of Biochemistry at Goethe University Frankfurt explains: "The serendipity about this experiment is that the clustering of receptors triggers a signal that is similar to that of neuropeptide Y. Solely by the clustering, we were able to trigger cell movement as a reaction of the cell. The laser spots even allowed us to control the direction of the cell movement." As the light-sensitive lock-and-key pairs utilized are very small compared to the receptors, the organization of the receptors in the cell membrane can be controlled with high precision using the laser spot. "This non-invasive method is thus particularly well suited to study the effects of receptor clustering in living cells," Tampé continues. "Our method can be used to investigate exciting scientific questions, such as how receptors are organized in networks and how new circuits are formed in the brain."


Story Source:

Materials provided by Goethe University Frankfurt. Note: Content may be edited for style and length.


Journal Reference:

  1. M. Florencia Sánchez, Sylvia Els-Heindl, Annette G. Beck-Sickinger, Ralph Wieneke, Robert Tampé. Photo-induced receptor confinement drives ligand-independent GPCR signaling. Science, 2021; eabb7657 DOI: 10.1126/science.abb7657

Cite This Page:

Goethe University Frankfurt. "Signal transduction without signal: Receptor clusters can direct cell movement." ScienceDaily. ScienceDaily, 25 February 2021. <www.sciencedaily.com/releases/2021/02/210225190945.htm>.
Goethe University Frankfurt. (2021, February 25). Signal transduction without signal: Receptor clusters can direct cell movement. ScienceDaily. Retrieved May 23, 2024 from www.sciencedaily.com/releases/2021/02/210225190945.htm
Goethe University Frankfurt. "Signal transduction without signal: Receptor clusters can direct cell movement." ScienceDaily. www.sciencedaily.com/releases/2021/02/210225190945.htm (accessed May 23, 2024).

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