Breaking and entering: How parasites prepare host cells for invasion
Before the parasite Toxoplasma gondii can invade a cell, it has to know it has reached the right place. New research from the Whitehead Institute reveals that the parasite doesn't simply recognize a ready-made doorway into the cell. Instead, it helps create the conditions for its own entry.
Toxoplasma gondii, a single-celled parasite responsible for toxoplasmosis, must invade host cells to survive and reproduce. Researchers at the Whitehead Institute have discovered that the parasite reorganizes sugar-coated proteins on a host cell's surface to create specialized membrane patches dependent on cholesterol. These patches help trigger the parasite's invasion machinery, rather than simply recognizing a ready-made doorway into the cell.
The host cell is actively involved in this process, with its surface being mixed and remodeled by the parasite. This discovery challenges the previous notion of the host cell as a passive, static entity during the invasion process. The study, led by first author Dylan Valleau, provides insights into the fundamental mechanisms underlying the parasite's invasion strategy, potentially offering new targets for drug development and a broader understanding of host-pathogen interactions.
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