Sensory representation and detection mechanisms of gut osmolality change
Takako Ichiki,
Tongtong Wang,
Ann Kennedy,
Allan-Hermann Pool,
Haruka Ebisu,
David J. Anderson and
Yuki Oka ()
Additional contact information
Takako Ichiki: California Institute of Technology
Tongtong Wang: California Institute of Technology
Ann Kennedy: California Institute of Technology
Allan-Hermann Pool: California Institute of Technology
Haruka Ebisu: California Institute of Technology
David J. Anderson: California Institute of Technology
Yuki Oka: California Institute of Technology
Nature, 2022, vol. 602, issue 7897, 468-474
Abstract:
Abstract Ingested food and water stimulate sensory systems in the oropharyngeal and gastrointestinal areas before absorption1,2. These sensory signals modulate brain appetite circuits in a feed-forward manner3–5. Emerging evidence suggests that osmolality sensing in the gut rapidly inhibits thirst neurons upon water intake. Nevertheless, it remains unclear how peripheral sensory neurons detect visceral osmolality changes, and how they modulate thirst. Here we use optical and electrical recording combined with genetic approaches to visualize osmolality responses from sensory ganglion neurons. Gut hypotonic stimuli activate a dedicated vagal population distinct from mechanical-, hypertonic- or nutrient-sensitive neurons. We demonstrate that hypotonic responses are mediated by vagal afferents innervating the hepatic portal area (HPA), through which most water and nutrients are absorbed. Eliminating sensory inputs from this area selectively abolished hypotonic but not mechanical responses in vagal neurons. Recording from forebrain thirst neurons and behavioural analyses show that HPA-derived osmolality signals are required for feed-forward thirst satiation and drinking termination. Notably, HPA-innervating vagal afferents do not sense osmolality itself. Instead, these responses are mediated partly by vasoactive intestinal peptide secreted after water ingestion. Together, our results reveal visceral hypoosmolality as an important vagal sensory modality, and that intestinal osmolality change is translated into hormonal signals to regulate thirst circuit activity through the HPA pathway.
Date: 2022
References: Add references at CitEc
Citations:
Downloads: (external link)
https://www.nature.com/articles/s41586-021-04359-5 Abstract (text/html)
Access to the full text of the articles in this series is restricted.
Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.
Export reference: BibTeX
RIS (EndNote, ProCite, RefMan)
HTML/Text
Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:602:y:2022:i:7897:d:10.1038_s41586-021-04359-5
Ordering information: This journal article can be ordered from
https://www.nature.com/
DOI: 10.1038/s41586-021-04359-5
Access Statistics for this article
Nature is currently edited by Magdalena Skipper
More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().