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Small molecules hit it big - new therapeutic approaches against viruses, bacteria, and cancer
Scientists from the Freie Universität Berlin have identified small molecule inhibitors of cellular uptake
The uptake of important signalling molecules such as growth factors but also communication within the nervous system depend on the intracellular scaffold protein clathrin. Clathrin is involved in the production of small only about 100 nm sized vesicles (a nanometer equals as little as 1/billion meter). These vesicles shuttle signalling molecules into the cell interior or serve as storage sites for the triggered release of transmitter in the nervous system. The scientists used small molecule compound libraries comprising about 20,000 different substances paired with medicinal chemistry-based synthesis to identify small molecules that specifically inhibit binding of clathtrin to its partner proteins. These compounds termed pitstops are able to prevent within minutes the uptake of signalling molecules, which stimulate cell growth and division, or the entry of human immunodeficiency virus (HIV) into cells. Using shiny fluorescent proteins the scientists could identify impaired dynamics of clathrin and its partners as the underlying reason for the internalization block. "Vesicle formation appears stalled as if you had put your cells into the freezer", explains Professor Haucke. Similar effects have been observed in lamprey and in cultured nerve cells from mice or rats treated with pitstops resulting in a block in vesicle reformation and neurotransmission. As many neurological disorders, such as epilepsy are caused by overexcitability of nerve cells dampening of neurotransmission by pitstops and like substances could open new avenues for the therapy of these diseases. "Clathrin-mediated uptake into cells is of such fundamental importantance that with the development of these inhibitors we might be able to devise new concepts for the treatment of so far incurable cancers such as brain tumors - tumors whose growth depends on the internalization of signalling molecules, which promote cell divsion", explains NeuroCure scientist Volker Haucke.
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