2005 Fiscal Year Final Research Report Summary
Analysis of the mechanisms on chemical reception and producing energy signal after dietary fat intake for cause investigation of its high palatability.
| Project/Area Number |
16380085
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Food science
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| Research Institution | Kyoto University |
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Principal Investigator |
FUSHIKI Tohru Kyoto University, Food Sci.& Biotech, Professor, 農学研究科, 教授 (20135544)
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| Co-Investigator(Kenkyū-buntansha) |
INOUE Kazuo Kyoto University, Associate Professor, 助教授 (80213148)
TSUZUKI Satosi Kyoto University, Assistant Professor, 助手 (50283651)
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| Project Period (FY) |
2004 – 2005
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| Keywords | dietary fat / palatability / oral stimulation / calcium imaging / inhibition of beta-oxidation / rewarding effect |
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| Research Abstract |
We studied the responses of cytosolic calcium ion concentrations in taste cells to signal transduction. Calcium imaging analysis of murine taste cells showed that oleic acid, linoleic acid, and linolenic acid increased cytosolic calcium ion concentrations. This suggests that long-chain fatty acids convey taste information by acting directly on taste cells.
We showed that mice exhibit reinforcing responses to corn oil. Conversely, mice do not show reinforcing responses to the low-energy fat substitute, sorbitol fatty acid ester. However, mice do exhibit reinforcing responses to sorbitol fatty acid ester when corn oil is also administered intragastrically. Moreover, mice refused further consumption of sorbitol fatty acid ester 30 min after the two-bottle test commenced. Thus, it seems that mice stop consuming sorbitol fatty acid ester in response to postingestive signals. Furthermore, we showed that mice did not exhibit reinforcing or palatability responses when beta-oxidation was inhibited. We concluded that the metabolism of fat partly mediated the rewarding effects of fat.
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