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Lin WY, Liu CH, Cheng J, Liu HP. Alterations of RNA-binding protein found in neurons in Drosophila neurons and glia influence synaptic transmission and lifespan. Front Mol Neurosci 2022; 15:1006455. [DOI: 10.3389/fnmol.2022.1006455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 10/24/2022] [Indexed: 11/13/2022] Open
Abstract
The found in neurons (fne), a paralog of the RNA-binding protein ELAV gene family in Drosophila, is required for post-transcriptional regulation of neuronal development and differentiation. Previous explorations into the functions of the FNE protein have been limited to neurons. The function of fne in Drosophila glia remains unclear. We induced the knockdown or overexpression of fne in Drosophila neurons and glia to determine how fne affects different types of behaviors, neuronal transmission and the lifespan. Our data indicate that changes in fne expression impair associative learning, thermal nociception, and phototransduction. Examination of synaptic transmission at presynaptic and postsynaptic terminals of the larval neuromuscular junction (NMJ) revealed that loss of fne in motor neurons and glia significantly decreased excitatory junction currents (EJCs) and quantal content, while flies with glial fne knockdown facilitated short-term synaptic plasticity. In muscle cells, overexpression of fne reduced both EJC and quantal content and increased short-term synaptic facilitation. In both genders, the lifespan could be extended by the knockdown of fne in neurons and glia; the overexpression of fne shortened the lifespan. Our results demonstrate that disturbances of fne in neurons and glia influence the function of the Drosophila nervous system. Further explorations into the physiological and molecular mechanisms underlying neuronal and glial fne and elucidation of how fne affects neuronal activity may clarify certain brain functions.
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Araki Y, Kawano T, Taru H, Saito Y, Wada S, Miyamoto K, Kobayashi H, Ishikawa HO, Ohsugi Y, Yamamoto T, Matsuno K, Kinjo M, Suzuki T. The novel cargo Alcadein induces vesicle association of kinesin-1 motor components and activates axonal transport. EMBO J 2007; 26:1475-86. [PMID: 17332754 PMCID: PMC1829376 DOI: 10.1038/sj.emboj.7601609] [Citation(s) in RCA: 125] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2006] [Accepted: 01/24/2007] [Indexed: 11/08/2022] Open
Abstract
Alcadeinalpha (Alcalpha) is an evolutionarily conserved type I membrane protein expressed in neurons. We show here that Alcalpha strongly associates with kinesin light chain (K(D) approximately 4-8x10(-9) M) through a novel tryptophan- and aspartic acid-containing sequence. Alcalpha can induce kinesin-1 association with vesicles and functions as a novel cargo in axonal anterograde transport. JNK-interacting protein 1 (JIP1), an adaptor protein for kinesin-1, perturbs the transport of Alcalpha, and the kinesin-1 motor complex dissociates from Alcalpha-containing vesicles in a JIP1 concentration-dependent manner. Alcalpha-containing vesicles were transported with a velocity different from that of amyloid beta-protein precursor (APP)-containing vesicles, which are transported by the same kinesin-1 motor. Alcalpha- and APP-containing vesicles comprised mostly separate populations in axons in vivo. Interactions of Alcalpha with kinesin-1 blocked transport of APP-containing vesicles and increased beta-amyloid generation. Inappropriate interactions of Alc- and APP-containing vesicles with kinesin-1 may promote aberrant APP metabolism in Alzheimer's disease.
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Affiliation(s)
- Yoichi Araki
- Laboratory of Neuroscience, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan
| | - Takanori Kawano
- Laboratory of Neuroscience, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan
| | - Hidenori Taru
- Laboratory of Neuroscience, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan
| | - Yuhki Saito
- Laboratory of Neuroscience, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan
| | - Sachiyo Wada
- Laboratory of Neuroscience, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan
| | - Kanako Miyamoto
- Department of Biological Science and Technology, Tokyo University of Science, Noda, Japan
| | - Hisako Kobayashi
- Department of Biological Science and Technology, Tokyo University of Science, Noda, Japan
| | | | - Yu Ohsugi
- Laboratory of Supramolecular Biophysics, Research Institute for Electric Science, Hokkaido University, Sapporo, Japan
| | - Tohru Yamamoto
- Laboratory of Neuroscience, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan
| | - Kenji Matsuno
- Department of Biological Science and Technology, Tokyo University of Science, Noda, Japan
| | - Masataka Kinjo
- Laboratory of Supramolecular Biophysics, Research Institute for Electric Science, Hokkaido University, Sapporo, Japan
| | - Toshiharu Suzuki
- Laboratory of Neuroscience, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan
- Laboratory of Neuroscience, Graduate School of Pharmaceutical Sciences, Hokkaido University, Kita12-Nishi6, Kita-ku, Sapporo 060-0812, Japan. Tel.: +81 11 706 3250; Fax: +81 11 706 4991; E-mail:
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Samson ML, Chalvet F. found in neurons, a third member of the Drosophila elav gene family, encodes a neuronal protein and interacts with elav. Mech Dev 2003; 120:373-83. [PMID: 12591606 DOI: 10.1016/s0925-4773(02)00444-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
elav, a gene necessary for neuronal differentiation and maintenance in Drosophila, encodes the prototype of a family of conserved proteins involved in post-transcriptional regulation. We identified found in neurons (fne), a gene encoding a new ELAV paralogue. We showed that FNE binds RNA in vitro. fne transcripts are present throughout development and contain long untranslated regions. Transcripts and proteins are restricted to neurons of the CNS and PNS during embryogenesis. These features are reminiscent of elav. However, fne expression is delayed compared to elav's, and FNE protein appears cytoplasmic, while ELAV is nuclear. GAL4-directed overexpression of fne in neurons leads to a reduction of stable transcripts produced from both the fne and elav endogenous loci, suggesting that fne autoregulates and also regulates elav.
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Affiliation(s)
- Marie-Laure Samson
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE 68198-4525, USA.
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