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DH44 neurons: gut-brain amino acid sensors
- Source :
- Cell Research
- Publication Year :
- 2018
- Publisher :
- Nature Publishing Group UK, 2018.
-
Abstract
- Adequate protein intake is crucial for the survival and well-being of animals. How animals assess prospective protein sources and ensure dietary amino acid intake plays a critical role in protein homeostasis. By using a quantitative feeding assay, we show that three amino acids, L-glutamate (L-Glu), L-alanine (L-Ala) and L-aspartate (L-Asp), but not their D-enantiomers or the other 17 natural L-amino acids combined, rapidly promote food consumption in the fruit fly Drosophila melanogaster. This feeding-promoting effect of dietary amino acids is independent of mating experience and internal nutritional status. In vivo and ex vivo calcium imagings show that six brain neurons expressing diuretic hormone 44 (DH44) can be rapidly and directly activated by these amino acids, suggesting that these neurons are an amino acid sensor. Genetic inactivation of DH44+ neurons abolishes the increase in food consumption induced by dietary amino acids, whereas genetic activation of these neurons is sufficient to promote feeding, suggesting that DH44+ neurons mediate the effect of dietary amino acids to promote food consumption. Single-cell transcriptome analysis and immunostaining reveal that a putative amino acid transporter, CG13248, is enriched in DH44+ neurons. Knocking down CG13248 expression in DH44+ neurons blocks the increase in food consumption and eliminates calcium responses induced by dietary amino acids. Therefore, these data identify DH44+ neuron as a key sensor to detect amino acids and to enhance food intake via a putative transporter CG13248. These results shed critical light on the regulation of protein homeostasis at organismal levels by the nervous system.
- Subjects :
- 0301 basic medicine
Male
Amino Acids, Acidic
Glutamic Acid
Nutritional Status
Article
03 medical and health sciences
Eating
Animals
Drosophila Proteins
Drosophila (subgenus)
Amino Acids
RNA, Small Interfering
Molecular Biology
chemistry.chemical_classification
Neurons
Aspartic Acid
Alanine
biology
Brain
Cell Biology
Feeding Behavior
biology.organism_classification
Research Highlight
Amino acid
030104 developmental biology
Biochemistry
chemistry
Insect Hormones
Calcium
Drosophila
Female
RNA Interference
Transcriptome
Drosophila Protein
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Cell Research
- Accession number :
- edsair.doi.dedup.....faa2bed9db049324f9ab28a0cb15452d