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Uemura I, Takahashi-Suzuki N, Sano A, Yamada S, Nakata A, Satoh T. Curcumin effects on age-related changes in oral immunity: an in vivo study. Br J Nutr 2024:1-9. [PMID: 38634264 DOI: 10.1017/s0007114524000801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/19/2024]
Abstract
The current study aimed to investigate the effects of ageing on oral immunity using β-defensin (DEFB) 1/2 as a marker and evaluate the effects of curcumin (CUR) on these processes. The study sample included thirty male C57BL/6J mice divided into three groups based on the treatment method used. The young control (YC) and old control (OC) groups received 0·5 % methylcellulose-400 (CUR vehicle) orally for 5 days, whereas the CUR group of older mice received a CUR solution suspended in 0·5 % methylcellulose-400 (dose: 3·0 mg/kg body). DEFB1/2 and immune indicator levels were measured in the saliva and salivary glands post-treatment. The saliva volume and protein content were significantly reduced in the OC group compared with the YC group. CUR administration restored these parameters, decreased DEFB1 expression in the salivary gland and increased DEFB1/2 secretion and DEFB2 expression. These findings were supported by epigenetic gene regulation and partial cytokine activation from changes in WD40 repeat protein 5, TNF alpha and IL-1beta. CUR can partially restore age-related changes in oral immune responses and promote oral health, thereby preventing frailty in the older population through a nutritional therapeutic pathway.
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Affiliation(s)
- Ippei Uemura
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 7-Jo 15-4-1 Maeda, Teine-ku, Sapporo, Hokkaido006-8585, Japan
| | - Natsuko Takahashi-Suzuki
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 7-Jo 15-4-1 Maeda, Teine-ku, Sapporo, Hokkaido006-8585, Japan
| | - Akari Sano
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 7-Jo 15-4-1 Maeda, Teine-ku, Sapporo, Hokkaido006-8585, Japan
| | - Shogo Yamada
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 7-Jo 15-4-1 Maeda, Teine-ku, Sapporo, Hokkaido006-8585, Japan
| | - Akifumi Nakata
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 7-Jo 15-4-1 Maeda, Teine-ku, Sapporo, Hokkaido006-8585, Japan
| | - Takashi Satoh
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 7-Jo 15-4-1 Maeda, Teine-ku, Sapporo, Hokkaido006-8585, Japan
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Poirier N, Ménétrier F, Moreno J, Boichot V, Heydel JM, Didierjean C, Canivenc-Lavier MC, Canon F, Neiers F, Schwartz M. Rattus norvegicus Glutathione Transferase Omega 1 Localization in Oral Tissues and Interactions with Food Phytochemicals. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:5887-5897. [PMID: 38441878 DOI: 10.1021/acs.jafc.4c00483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
Glutathione transferases are xenobiotic-metabolizing enzymes with both glutathione-conjugation and ligandin roles. GSTs are present in chemosensory tissues and fluids of the nasal/oral cavities where they protect tissues from exogenous compounds, including food molecules. In the present study, we explored the presence of the omega-class glutathione transferase (GSTO1) in the rat oral cavity. Using immunohistochemistry, GSTO1 expression was found in taste bud cells of the tongue epithelium and buccal cells of the oral epithelium. Buccal and lingual extracts exhibited thiol-transferase activity (4.9 ± 0.1 and 1.8 ± 0.1 μM/s/mg, respectively). A slight reduction from 4.9 ± 0.1 to 4.2 ± 0.1 μM/s/mg (p < 0.05; Student's t test) was observed in the buccal extract with 100 μM GSTO1-IN-1, a specific inhibitor of GSTO1. RnGSTO1 exhibited the usual activities of omega GSTs, i.e., thiol-transferase (catalytic efficiency of 8.9 × 104 M-1·s-1), and phenacyl-glutathione reductase (catalytic efficiency of 8.9 × 105 M-1·s-1) activities, similar to human GSTO1. RnGSTO1 interacts with food phytochemicals, including bitter compounds such as luteolin (Ki = 3.3 ± 1.9 μM). Crystal structure analysis suggests that luteolin most probably binds to RnGSTO1 ligandin site. Our results suggest that GSTO1 could interact with food phytochemicals in the oral cavity.
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Affiliation(s)
- Nicolas Poirier
- CSGA, INRAE, CNRS, University of Burgundy, Institut Agro, Dijon 21065, France
| | - Franck Ménétrier
- CSGA, INRAE, CNRS, University of Burgundy, Institut Agro, Dijon 21065, France
| | - Jade Moreno
- CSGA, INRAE, CNRS, University of Burgundy, Institut Agro, Dijon 21065, France
| | - Valentin Boichot
- CSGA, INRAE, CNRS, University of Burgundy, Institut Agro, Dijon 21065, France
| | - Jean-Marie Heydel
- CSGA, INRAE, CNRS, University of Burgundy, Institut Agro, Dijon 21065, France
| | | | | | - Francis Canon
- CSGA, INRAE, CNRS, University of Burgundy, Institut Agro, Dijon 21065, France
| | - Fabrice Neiers
- CSGA, INRAE, CNRS, University of Burgundy, Institut Agro, Dijon 21065, France
| | - Mathieu Schwartz
- CSGA, INRAE, CNRS, University of Burgundy, Institut Agro, Dijon 21065, France
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Gutierrez VA, Martin LE, Torregrossa AM. Salivary proteins rescue within-session suppression and conditioned avoidance in response to an intragastric quinine infusion. Physiol Behav 2024; 274:114430. [PMID: 38070721 DOI: 10.1016/j.physbeh.2023.114430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 10/04/2023] [Accepted: 12/06/2023] [Indexed: 12/23/2023]
Abstract
A subset of salivary proteins (SPs) upregulates in response to a quinine-containing diet. The presence of these SPs then results in decreased bitter taste responding and taste nerve signaling. Bitter taste receptors in the oral cavity are also found in the stomach and intestines and contribute to behaviors that are influenced by post-oral signaling. It has been previously demonstrated that after several pairings of post-orally infused bitter stimuli and a neutral flavor, animals learn to avoid the flavor that was paired with gastric bitter, this is referred to as conditioned avoidance. Furthermore, animals will decrease licking of a neutral solution within a test session, when licking is paired with an intragastric bitter infusion; this has been described as within-session suppression. We used these paradigms to test the role of SPs in behaviors influenced by post-oral signaling. In both paradigms, the animal is given a test solution directly into the stomach (with or without quinine, and with or without SPs), and the infusions are self-administered by licking to a neutral solution (Kool-Aid). Quinine successfully conditioned a flavor avoidance, but, in a separate trial, we were unable to detect conditioning in the presence of SPs from donor animals. Likewise, quinine was able to suppress licking within the conditioned suppression paradigm, but the effect of the bitter was blocked in the presence of saliva containing SPs. Together, these data suggest that behaviors driven by post-oral signaling can be altered by SPs.
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Affiliation(s)
- V Ascencio Gutierrez
- Department of Psychology, State University of New York at Buffalo, Buffalo, NY, 14260, USA
| | - L E Martin
- Department of Food Science and Technology, Oregon State University, Corvallis, Oregon, 97331, USA
| | - A-M Torregrossa
- Department of Psychology, State University of New York at Buffalo, Buffalo, NY, 14260, USA; University at Buffalo Center for Ingestive Behavior Research, Buffalo, New York, 14260, USA.
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