Skip to main content

Main menu

  • HOME
  • CONTENT
    • Early Release
    • Featured
    • Current Issue
    • Issue Archive
    • Blog
    • Collections
    • Podcast
  • TOPICS
    • Cognition and Behavior
    • Development
    • Disorders of the Nervous System
    • History, Teaching and Public Awareness
    • Integrative Systems
    • Neuronal Excitability
    • Novel Tools and Methods
    • Sensory and Motor Systems
  • ALERTS
  • FOR AUTHORS
  • ABOUT
    • Overview
    • Editorial Board
    • For the Media
    • Privacy Policy
    • Contact Us
    • Feedback
  • SUBMIT

User menu

Search

  • Advanced search
eNeuro
eNeuro

Advanced Search

 

  • HOME
  • CONTENT
    • Early Release
    • Featured
    • Current Issue
    • Issue Archive
    • Blog
    • Collections
    • Podcast
  • TOPICS
    • Cognition and Behavior
    • Development
    • Disorders of the Nervous System
    • History, Teaching and Public Awareness
    • Integrative Systems
    • Neuronal Excitability
    • Novel Tools and Methods
    • Sensory and Motor Systems
  • ALERTS
  • FOR AUTHORS
  • ABOUT
    • Overview
    • Editorial Board
    • For the Media
    • Privacy Policy
    • Contact Us
    • Feedback
  • SUBMIT
PreviousNext
Research ArticleResearch Article: Methods/New Tools, Novel Tools and Methods

A Method for Evaluating Hunger and Thirst in Monkeys by Measuring Blood Ghrelin and Osmolality Levels

Yuki Suwa, Jun Kunimatsu, Akua Kamata, Masayuki Matsumoto and Hiroshi Yamada
eNeuro 16 July 2024, 11 (8) ENEURO.0481-23.2024; https://doi.org/10.1523/ENEURO.0481-23.2024
Yuki Suwa
1Academic Service Office for the Medical Science Area, University of Tsukuba, Tsukuba 305-8577, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Jun Kunimatsu
2Division of Biomedical Science, Institute of Medicine, University of Tsukuba, Tsukuba 305-8577, Japan
3Transborder Medical Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Jun Kunimatsu
Akua Kamata
4Medical Sciences, University of Tsukuba, Tsukuba 305-8577, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Masayuki Matsumoto
2Division of Biomedical Science, Institute of Medicine, University of Tsukuba, Tsukuba 305-8577, Japan
3Transborder Medical Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Hiroshi Yamada
2Division of Biomedical Science, Institute of Medicine, University of Tsukuba, Tsukuba 305-8577, Japan
3Transborder Medical Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Hiroshi Yamada
  • Article
  • Figures & Data
  • Info & Metrics
  • eLetters
  • PDF
Loading

Article Figures & Data

Figures

  • Figure 1.
    • Download figure
    • Open in new tab
    • Download powerpoint
    Figure 1.

    Controlled food and water intake and behavioral measures. A, Five different experimental schedules for the control of food and water intakes: top row, regular feeding condition for daily allocation of the regular dry meal and water (Reg in B); second row, blood test condition for collecting blood for testing the influence of hunger and thirst (20 h in B); middle row, intake test condition to measure the food and water intake without anesthesia (test in C); fourth row, control condition for evaluating thirst to measure the effect of dry meal intake on water intake (con1 in C); bottom row, control condition to precheck whether 17 h of no food access was enough to induce the hunger, compared with the 20 h (17 h in B). The controlled food and water access is initiated on the day before the test day, at 14:00, except Control 2 condition. B, The amount of food intake in four monkeys during the blood test condition (20 h), Control 2 (17 h), and regular feeding with a constant dry meal applied at 11:00 (Reg). C, Amount of water intake in four monkeys during the intake test (test) and control Condition 1 (con1). In B, the result from monkey Y23 was not demonstrated because his blood data were not collected.

  • Figure 2.
    • Download figure
    • Open in new tab
    • Download powerpoint
    Figure 2.

    Blood ghrelin and osmolality levels before and after dry meal intake. A, The box plot of blood ghrelin levels in the four monkeys before (pre) and after (post) consuming the regular dry meal. B, The box plot of blood osmolality levels before (pre) and after (post) the consumption of regular dry meals in four monkeys. In A and B, the mean is indicated by a cross. Consecutive measurements are obtained daily using a line.

  • Figure 3.
    • Download figure
    • Open in new tab
    • Download powerpoint
    Figure 3.

    No consistent relationship between the changes in blood ghrelin and osmolality levels. A, No significant relationship observed between changes in blood ghrelin and osmolality levels before (pre) and after (post) the food intake. The dashed line represents the regression slope. B, Two consecutive measurements per day are represented by dotted black lines. The thick gray and orange lines indicate the regression lines for the data in the pre- and postperiods, respectively.

  • Figure 4.
    • Download figure
    • Open in new tab
    • Download powerpoint
    Figure 4.

    Amounts of food and water intake without anesthesia. A, The amount of the dry meal intake during the 1.5 h of the food intake test. B, The increase in water intake amount during the 1.5 h of the food intake test compared with that during control Condition 1, in which no food was provided. C, No significant relationship observed between the increase in water intake compared with control Condition 1 (vertical axis) and the amount of the food intake during the intake test (horizontal axis). The dashed line represents the regression slope.

  • Figure 5.
    • Download figure
    • Open in new tab
    • Download powerpoint
    Figure 5.

    Assessing the influence of plasma concentration on measuring optical density. Plots of the measured optical density (vertical axis) against standard concentrations. Each point is obtained from the average of two wells: no plasma (black), 5% plasma (blue), and 10% plasma (green). The colored dotted lines indicate a linear fit to the data. R2 are indicated.

Back to top

In this issue

eneuro: 11 (8)
eNeuro
Vol. 11, Issue 8
August 2024
  • Table of Contents
  • Index by author
  • Masthead (PDF)
Email

Thank you for sharing this eNeuro article.

NOTE: We request your email address only to inform the recipient that it was you who recommended this article, and that it is not junk mail. We do not retain these email addresses.

Enter multiple addresses on separate lines or separate them with commas.
A Method for Evaluating Hunger and Thirst in Monkeys by Measuring Blood Ghrelin and Osmolality Levels
(Your Name) has forwarded a page to you from eNeuro
(Your Name) thought you would be interested in this article in eNeuro.
CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.
Print
View Full Page PDF
Citation Tools
A Method for Evaluating Hunger and Thirst in Monkeys by Measuring Blood Ghrelin and Osmolality Levels
Yuki Suwa, Jun Kunimatsu, Akua Kamata, Masayuki Matsumoto, Hiroshi Yamada
eNeuro 16 July 2024, 11 (8) ENEURO.0481-23.2024; DOI: 10.1523/ENEURO.0481-23.2024

Citation Manager Formats

  • BibTeX
  • Bookends
  • EasyBib
  • EndNote (tagged)
  • EndNote 8 (xml)
  • Medlars
  • Mendeley
  • Papers
  • RefWorks Tagged
  • Ref Manager
  • RIS
  • Zotero
Respond to this article
Share
A Method for Evaluating Hunger and Thirst in Monkeys by Measuring Blood Ghrelin and Osmolality Levels
Yuki Suwa, Jun Kunimatsu, Akua Kamata, Masayuki Matsumoto, Hiroshi Yamada
eNeuro 16 July 2024, 11 (8) ENEURO.0481-23.2024; DOI: 10.1523/ENEURO.0481-23.2024
Twitter logo Facebook logo Mendeley logo
  • Tweet Widget
  • Facebook Like
  • Google Plus One

Jump to section

  • Article
    • Abstract
    • Significance Statement
    • Introduction
    • Materials and Methods
    • Results
    • Discussion
    • Data Availability
    • Footnotes
    • References
    • Synthesis
    • Author Response
  • Figures & Data
  • Info & Metrics
  • eLetters
  • PDF

Keywords

  • hunger
  • monkey
  • reward
  • satiety
  • thirst

Responses to this article

Respond to this article

Jump to comment:

No eLetters have been published for this article.

Related Articles

Cited By...

More in this TOC Section

Research Article: Methods/New Tools

  • CalTrig: A GUI-based Machine Learning Approach for Decoding Neuronal Calcium Transients in Freely Moving Rodents
  • Spiking neural network models of interaural time difference extraction via a massively collaborative process
  • Adapt-A-Maze: An Open-Source Adaptable and Automated Rodent Behavior Maze System
Show more Research Article: Methods/New Tools

Novel Tools and Methods

  • CalTrig: A GUI-based Machine Learning Approach for Decoding Neuronal Calcium Transients in Freely Moving Rodents
  • Spiking neural network models of interaural time difference extraction via a massively collaborative process
  • Adapt-A-Maze: An Open-Source Adaptable and Automated Rodent Behavior Maze System
Show more Novel Tools and Methods

Subjects

  • Novel Tools and Methods
  • Home
  • Alerts
  • Follow SFN on BlueSky
  • Visit Society for Neuroscience on Facebook
  • Follow Society for Neuroscience on Twitter
  • Follow Society for Neuroscience on LinkedIn
  • Visit Society for Neuroscience on Youtube
  • Follow our RSS feeds

Content

  • Early Release
  • Current Issue
  • Latest Articles
  • Issue Archive
  • Blog
  • Browse by Topic

Information

  • For Authors
  • For the Media

About

  • About the Journal
  • Editorial Board
  • Privacy Notice
  • Contact
  • Feedback
(eNeuro logo)
(SfN logo)

Copyright © 2025 by the Society for Neuroscience.
eNeuro eISSN: 2373-2822

The ideas and opinions expressed in eNeuro do not necessarily reflect those of SfN or the eNeuro Editorial Board. Publication of an advertisement or other product mention in eNeuro should not be construed as an endorsement of the manufacturer’s claims. SfN does not assume any responsibility for any injury and/or damage to persons or property arising from or related to any use of any material contained in eNeuro.