2026-04-17T04:19:51Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2036832025-12-04T19:31:10Zcom_2072_1057col_2072_478908col_2072_478917

00925njm 22002777a 4500 dc Letizia, Annalisa author Espinás, Maria Lluïsa author Giannios, Panagiotis author Llimargas i Casanova, Marta author 2023-11-15T10:45:08Z 2023-11-15T10:45:08Z 2023-01-01 2023-11-14T11:08:02Z Unveiling the molecular mechanisms of receptor activation has led to much understanding of development as well as the identification of important drug targets. We use the Drosophila tracheal system to study the activity of two families of widely used and conserved receptors, the TNFRs and the RTK-FGFRs. Breathless, an FGFR, controls the program of differentiation of the tracheal terminal cells in response to ligand activation. Here we identify a role for Wengen, a TNFR, in repressing the terminal cell program by regulating the MAPK pathway downstream of Breathless. We find that Wengen acts independently of both its canonical ligand and downstream pathway genes. Wengen does not stably localise at the membrane and is instead internalised-a trafficking that seems essential for activity. We show that Breathless and Wengen colocalise in intracellular vesicles and form a complex. Furthermore, Wengen regulates Breathless accumulation, possibly regulating Breathless trafficking and degradation. We propose that, in the tracheal context, Wengen interacts with Breathless to regulate its activity, and suggest that such unconventional mechanism, involving binding by TNFRs to unrelated proteins, may be a general strategy of TNFRs.© 2023. Springer Nature Limited. Receptors de medicaments Aparell respiratori Drug receptors Respiratory organs The TNFR Wengen regulates the FGF pathway by an unconventional mechanism