Abstract:
:Tachykinins are multifunctional neuropeptides that have been identified in vertebrates as well as invertebrates. The C-terminal FXGXRa-motif constitutes the consensus active core region of invertebrate tachykinins. In Drosophila, two putative G protein-coupled tachykinin receptors have been cloned: DTKR and NKD. This study focuses on the functional characterization of DTKR, the Drosophila ortholog of the stable fly's tachykinin receptor (STKR). Tachykinins containing an alanine residue instead of the highly conserved glycine (FXAXRa) display partial agonism on STKR-mediated Ca(2+)-responses, but not on cAMP-responses. STKR therefore seems to differentiate between a number of tachykinins. Gly- and Ala-containing tachykinins are both encoded in the Drosophila tachykinin precursor, thus raising the question of whether DTKR can also distinguish between these two tachykinin types. DTKR was activated by all Drosophila tachykinins and inhibited by tachykinin antagonists. Ala-containing analogs did not produce the remarkable activation behavior previously observed with STKR, suggesting different mechanisms of discerning ligands and/or activating effector pathways for STKR and DTKR.
journal_name
Peptidesjournal_title
Peptidesauthors
Poels J,Verlinden H,Fichna J,Van Loy T,Franssens V,Studzian K,Janecka A,Nachman RJ,Vanden Broeck Jdoi
10.1016/j.peptides.2006.06.014subject
Has Abstractpub_date
2007-01-01 00:00:00pages
103-8issue
1eissn
0196-9781issn
1873-5169pii
S0196-9781(06)00489-Xjournal_volume
28pub_type
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