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Biol Open July 23, 2018; 7 (7):

Location and functions of Inebriated in the Drosophila eye.

Borycz J , Ziegler A , Borycz JA , Uhlenbrock G , Tapken D , Caceres L , Hollmann M , Hovemann BT , Meinertzhagen IA .

Histamine (HA) is a neurotransmitter in arthropod photoreceptors. It is recycled via conjugation to β-alanine to form β-alanylhistamine (carcinine). Conjugation occurs in epithelial glia that surround photoreceptor terminals in the first optic neuropil, and carcinine (CA) is then transported back to photoreceptors and cleaved to liberate HA and β-alanine. The gene Inebriated (Ine) encodes an Na+/Cl--dependent SLC6 family transporter translated as two protein isoforms, long (P1) and short (P2). Photoreceptors specifically express Ine-P2 whereas Ine-P1 is expressed in non-neuronal cells. Both ine1 and ine3 have significantly reduced head HA contents compared with wild type, and a smaller increase in head HA after drinking 1% CA. Similarly, uptake of 0.1% CA was reduced in ine1 and ine3 mutant synaptosomes, but increased by 90% and 84% respectively for fractions incubated in 0.05% β-Ala, compared with wild type. Screening potential substrates in Ine expressing Xenopus oocytes revealed very little response to carcinine and β-Ala but increased conductance with glycine. Both ine1 and ine3 mutant responses in light-dark phototaxis did not differ from wild-type. Collectively our results suggest that Inebriated functions in an adjunct role as a transporter to the previously reported carcinine transporter CarT.

PubMed ID: 30037884
PMC ID: PMC6078345
Article link: Biol Open

Species referenced: Xenopus
Genes referenced: cartpt hdc lgals4.2

Article Images: [+] show captions
References [+] :
Agullo, Beta-alanine transport in synaptic plasma membrane vesicles from rat brain. Efflux, exchange and stoichiometry. 1986, Pubmed