{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,4]],"date-time":"2025-11-04T22:50:31Z","timestamp":1762296631992},"reference-count":54,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2003,1,16]],"date-time":"2003-01-16T00:00:00Z","timestamp":1042675200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Neurobiol."],"published-print":{"date-parts":[[2003,2,15]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The <jats:italic>Drosophila<\/jats:italic> Rel transcription factor Dorsal and its inhibitor Cactus participate in a signal transduction pathway involved in several biologic processes, including embryonic pattern formation, immunity, and muscle development. In contrast with embryonic muscle, where Dorsal is reportedly absent, this protein and Cactus accumulates in the neuromuscular junctions in the muscle of both larvae and adults. The phenotype of homozygous <jats:italic>dorsal<\/jats:italic> mutant larvae suggested that Dorsal and Cactus maybe necessary for normal function and maintenance of the neuromuscular system. Here we investigate if these proteins can respond to synaptic activity. Using larval body wall preparations and antibodies specific for Dorsal or Cactus we show that the amount of these proteins at the neuromuscular junction is substantially decreased after electrical stimulation of the nerves or incubation in glutamate, the principal transmitter in this type of synapse. The specificity of the response was tested with a glutamate receptor antagonist (argiotoxin 636). Because the effect can be reproduced using a calcium ionophore (ionomycin treatment) as well as blocked by the inhibition of the muscle ryanodine receptor (tetracaine treatment), the involvement of calcium in this process seems likely. We also observed that the inhibition of the calcium dependent protein phosphatase calcineurin prevents the effect of glutamate on the fluorescence for Dorsal and Cactus, suggesting its participation in a signal transduction cascade that may activate Dorsal in the muscle independently of Toll. Our results are consistent with a novel function of the Rel factor Dorsal in a molecular pathway turned on by neural activity and\/or contractile activity. \u00a9 2003 Wiley Periodicals, Inc. J Neurobiol 54: 525\u2013536, 2003<\/jats:p>","DOI":"10.1002\/neu.10179","type":"journal-article","created":{"date-parts":[[2003,1,17]],"date-time":"2003-01-17T16:48:28Z","timestamp":1042822108000},"page":"525-536","source":"Crossref","is-referenced-by-count":21,"title":["Synaptic activity modifies the levels of dorsal and cactus at the neuromuscular junction of 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