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Yamaki M, Saito H, Mimori T, Suzuki Y, Nagasaki M, Suzuki K, Satoh-Kuriwada S, Shoji N, Isono K, Goto T, Shirakawa H, Komai M. Analysis of Genetic Polymorphism of Bitter Taste Receptor TAS2R38 and TAS2R46, and Its Relationship with Eating and Drinking Habits in Japanese ToMMo Subjects. J Nutr Sci Vitaminol (Tokyo) 2023; 69:347-356. [PMID: 37940575 DOI: 10.3177/jnsv.69.347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2023]
Abstract
Human type 2 taste receptor (TAS2R) genes encode bitter-taste receptors that are activated by various bitter ligands. It has been said that TAS2R38 may detect bitter substances and then suppress their intake by controlling gustatory or digestive responses. The major haplotypes of TAS2R38 involve three non-synonymous, closely-linked single-nucleotide polymorphisms (SNPs), leading to three amino acid substitutions (A49P, V262A and I296V) and resulting in a PAV or AVI allele. The allele frequency of AVI/PAV was 0.42/0.58 in this study. The genotype frequency distributions of TAS2R38 were 18.32%, 46.95% and 33.95% for AVI/AVI, AVI/PAV and PAV/PAV, respectively, and were in Hardy-Weinberg equilibrium. Five haplotype combinations of minor alleles were identified: AVI/AAV, AVI/AVV, AAI/PAV, AVI/PVV, AVI/AAI, with corresponding frequencies of 0.49%, 0.10%, 0.10%, 0.05%, 0.05%, respectively, in 2,047 Japanese Tohoku Medical Megabank Organization (ToMMo) subjects (2KJPN). The 16 subjects with these minor alleles were excluded from the questionnaire analysis, which found no significant differences among the major TAS2R38 genotypes (AVI/AVI, AVI/PAV and PAV/PAV) in the intake frequency of cruciferous vegetables or in the frequency of drinking alcohol. This result differs from previous data using American and European subjects. This is the first study to analyze the relationship between TAS2R38 genotype and the eating and drinking habits of Japanese subjects. It was also shown that there were no relationships at all between the genetic polymorphism of TAS2R46 and the phenotypes such as clinical BMI, eating and drinking habits among the 3 genotypes of TAS2R46 (∗/∗, ∗/W, W/W) at position W250∗ (∗stop codon).
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Affiliation(s)
- Michiko Yamaki
- Laboratory of Nutrition, Department of Food and Natural Product Science, Graduate School of Agricultural Science, Tohoku University
- Department of Home Economics, Division of Health and Nutrition, Tohoku Seikatsu Bunka University
| | - Hiroki Saito
- Laboratory of Nutrition, Department of Food and Natural Product Science, Graduate School of Agricultural Science, Tohoku University
| | | | - Yoichi Suzuki
- Tohoku Medical Megabank Organization, Tohoku University
| | - Masao Nagasaki
- Tohoku Medical Megabank Organization, Tohoku University
- Center for Genomic Medicine, Graduate School of Medicine, Kyoto University
| | | | - Shizuko Satoh-Kuriwada
- Department of Disease Management Dentistry, Division of Comprehensive Dentistry, Tohoku University Graduate School of Dentistry
| | - Noriaki Shoji
- Department of Disease Management Dentistry, Division of Dental Informatics and Radiology, Tohoku University Graduate School of Dentistry
| | - Kunio Isono
- Laboratory of Nutrition, Department of Food and Natural Product Science, Graduate School of Agricultural Science, Tohoku University
| | - Tomoko Goto
- Laboratory of Nutrition, Department of Food and Natural Product Science, Graduate School of Agricultural Science, Tohoku University
- Faculty of Human Life Science, Miyagi Gakuin Women's University
| | - Hitoshi Shirakawa
- Laboratory of Nutrition, Department of Food and Natural Product Science, Graduate School of Agricultural Science, Tohoku University
| | - Michio Komai
- Laboratory of Nutrition, Department of Food and Natural Product Science, Graduate School of Agricultural Science, Tohoku University
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Yamaki M, Saito H, Isono K, Goto T, Shirakawa H, Shoji N, Satoh-Kuriwada S, Sasano T, Okada R, Kudoh K, Motoi F, Unno M, Komai M. Genotyping Analysis of Bitter-Taste Receptor Genes TAS2R38 and TAS2R46 in Japanese Patients with Gastrointestinal Cancers. J Nutr Sci Vitaminol (Tokyo) 2018; 63:148-154. [PMID: 28552880 DOI: 10.3177/jnsv.63.148] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Type-2 bitter-taste receptors (TAS2Rs) are important for the evaluation of food quality and the nutritional control in animals. Mutations in some TAS2Rs including TAS2R38 are known to increase susceptibility to various diseases. However, the involvement of TAS2Rs in cancers has not been well understood. We conducted a pilot study by genotyping two TAS2R genes, TAS2R38 and TAS2R46, in Japanese cancer patients diagnosed with the following types of cancer: biliary tract cancer, hepatocellular carcinoma, pancreatic cancer, colorectal cancer and gastric cancer. We selected the two TAS2Rs because they carry virtually non-functional alleles in human populations. We found that cancer risk is not associated with any TAS2R46 genotypes since there were no significant differences in genotype frequencies between cancer patients and controls. On the other hand, we confirmed that phenylthiocarbamide (PTC) non-tasters homozygous (AVI/AVI) for TAS2R38 were more frequent among Japanese cancer patients than those among controls as suggested in a previous study. The AVI/AVI genotype was therefore considered to increases cancer risk. In contrast, we also found that homozygous (PAV/PAV) PTC tasters are less frequent among cancer patients, suggesting that the PAV/PAV is a cancer resistant genotype that decreases cancer risk. Genotype frequencies for heterozygous AVI/PAV genotype were not significantly different between the two groups. It is suggested that the risk and resistance of cancers is antagonistically controlled by the two TAS2R38 alleles, PAV and AVI, rather than by the AVI allele alone.
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Affiliation(s)
- Michiko Yamaki
- Department of Science of Food Function and Health, Division of Bioscience and Biotechnology for Future Bioindustries, Graduate School of Agricultural Science, Tohoku University
| | - Hiroki Saito
- Department of Science of Food Function and Health, Division of Bioscience and Biotechnology for Future Bioindustries, Graduate School of Agricultural Science, Tohoku University
| | - Kunio Isono
- Department of Science of Food Function and Health, Division of Bioscience and Biotechnology for Future Bioindustries, Graduate School of Agricultural Science, Tohoku University
| | - Tomoko Goto
- Department of Science of Food Function and Health, Division of Bioscience and Biotechnology for Future Bioindustries, Graduate School of Agricultural Science, Tohoku University
| | - Hitoshi Shirakawa
- Department of Science of Food Function and Health, Division of Bioscience and Biotechnology for Future Bioindustries, Graduate School of Agricultural Science, Tohoku University
| | - Noriaki Shoji
- Department of Oral Medicine and Surgery, Division of Oral Diagnosis, Tohoku University Graduate School of Dentistry
| | - Shizuko Satoh-Kuriwada
- Department of Oral Medicine and Surgery, Division of Oral Diagnosis, Tohoku University Graduate School of Dentistry
| | - Takashi Sasano
- Department of Oral Medicine and Surgery, Division of Oral Diagnosis, Tohoku University Graduate School of Dentistry
| | - Ryo Okada
- Department of Organ Regulatory Surgery, Division of Surgery, Fukushima Medical University.,Department of Surgery, Division of Gastroenterological Surgery, Tohoku University Graduate School of Medicine
| | - Katsuyoshi Kudoh
- Department of Surgery, Division of Gastroenterological Surgery, Tohoku University Graduate School of Medicine
| | - Fuyuhiko Motoi
- Department of Surgery, Division of Gastroenterological Surgery, Tohoku University Graduate School of Medicine
| | - Michiaki Unno
- Department of Surgery, Division of Gastroenterological Surgery, Tohoku University Graduate School of Medicine
| | - Michio Komai
- Department of Science of Food Function and Health, Division of Bioscience and Biotechnology for Future Bioindustries, Graduate School of Agricultural Science, Tohoku University
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Trachootham D, Satoh-Kuriwada S, Lam-ubol A, Promkam C, Chotechuang N, Sasano T, Shoji N. Differences in Taste Perception and Spicy Preference: A Thai–Japanese Cross-cultural Study. Chem Senses 2017; 43:65-74. [DOI: 10.1093/chemse/bjx071] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Kojima I, Sakamoto M, Iikubo M, Kumamoto H, Muroi A, Sugawara Y, Satoh-Kuriwada S, Sasano T. Diagnostic performance of MR imaging of three major salivary glands for Sjögren's syndrome. Oral Dis 2016; 23:84-90. [PMID: 27580143 DOI: 10.1111/odi.12577] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 08/23/2016] [Accepted: 08/25/2016] [Indexed: 11/28/2022]
Abstract
OBJECTIVE We analyzed the diagnostic performance of the MR imaging findings of the parotid, submandibular, and sublingual glands to discriminate between patients with and without Sjögren's syndrome. METHODS We retrospectively analyzed the correlation between the MR imaging and histopathological findings obtained from 69 patients with clinically suspected Sjögren's syndrome. We evaluated the heterogeneous signal intensity distribution on T1- and T2-weighted images, the multiple high-signal-intensity spots on MR sialograms, and the volume of the parotid, submandibular, and sublingual salivary glands. RESULTS The multiple high-signal-intensity spots in the parotid gland showed the highest sensitivity and diagnostic accuracy (82% and 83%, respectively). In addition, the multiple high-signal-intensity spots and the heterogeneous signal intensity distribution in the submandibular gland showed high specificity (100% and 88%, respectively). The volume of the submandibular gland, but not that of the parotid or sublingual gland, was smaller in patients with Sjögren's syndrome. CONCLUSIONS The presence of multiple high-signal-intensity spots on an MR sialogram in the parotid gland should be considered the best diagnostic indicator for Sjögren's syndrome. The presence of spots, heterogeneity, and the change to smaller volumes in the submandibular gland were also helpful because of their high specificity, particularly in advanced cases.
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Affiliation(s)
- I Kojima
- Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - M Sakamoto
- Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - M Iikubo
- Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - H Kumamoto
- Department of Oral Pathology, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - A Muroi
- Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Y Sugawara
- Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - S Satoh-Kuriwada
- Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - T Sasano
- Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan
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Sasano T, Satoh-Kuriwada S. [Clinical research topics on the Umami taste sensitivity test for a taste diagnosis
]. Nihon Yakurigaku Zasshi 2015; 145:330. [PMID: 26063158 DOI: 10.1254/fpj.145.330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Satoh-Kuriwada S, Sasano T. [A remedy for dry mouth using taste stimulation
]. Nihon Yakurigaku Zasshi 2015; 145:288-292. [PMID: 26063150 DOI: 10.1254/fpj.145.288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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Shoji N, Kaneta N, Satoh-Kuriwada S, Tsuchiya M, Hashimoto N, Uneyama H, Kawai M, Sasano T. Expression of umami-taste-related genes in the tongue: a pilot study for genetic taste diagnosis. Oral Dis 2015; 21:801-6. [PMID: 25990784 DOI: 10.1111/odi.12350] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Revised: 05/01/2015] [Accepted: 05/08/2015] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Expression of taste-related genes in the tongue was analysed to develop a technique for genetic diagnosis of umami taste disorders. MATERIALS AND METHODS Tissue samples were collected from healthy volunteers by scraping the foliate papillae of the tongue. Immunocytochemistry staining of gustducin, a taste-cell-specific G protein, and gene expression analysis by real-time polymerase chain reaction of β-actin, gustducin (GNAT3) and umami receptors (T1R1, T1R3 and mGluR1) were performed. Changes in umami receptor expression following application of umami substances onto the tongue were analysed. RESULTS Gustducin-positive cells were observed in the samples, indicating the presence of taste cells. Gene expression of β-actin, GNAT3, T1R1 and T1R3 was detected in all seven samples tested, while that of mGluR1 was detected in four samples. Sequence analysis by NCBI Blast showed that each polymerase chain reaction product had a 99% rate of identification of its target sequence. Stimulation of the tongue with monosodium glutamate significantly upregulated the gene expression levels of T1R1 and T1R3, indicating that this method can detect alterations in umami-related gene expression. CONCLUSION Evaluation of the expression of the umami receptor genes, T1R1 and T1R3, in the tongue may be clinically useful for objective genetic diagnosis of umami taste disorders.
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Affiliation(s)
- N Shoji
- Division of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - N Kaneta
- Division of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - S Satoh-Kuriwada
- Division of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - M Tsuchiya
- Division of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan.,Tohoku Fukushi University, Sendai, Japan
| | - N Hashimoto
- Division of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - H Uneyama
- Institute for Innovation, Ajinomoto Company Inc., Kawasaki, Tokyo, Japan
| | - M Kawai
- Institute for Innovation, Ajinomoto Company Inc., Kawasaki, Tokyo, Japan
| | - T Sasano
- Division of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan
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Satoh-Kuriwada S, Kawai M, Iikubo M, Sekine-Hayakawa Y, Shoji N, Uneyama H, Sasano T. Development of an umami taste sensitivity test and its clinical use. PLoS One 2014; 9:e95177. [PMID: 24748056 PMCID: PMC3991614 DOI: 10.1371/journal.pone.0095177] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2013] [Accepted: 03/25/2014] [Indexed: 11/23/2022] Open
Abstract
There is a close relationship between perception of umami, which has become recognized as the fifth taste, and the human physical condition. We have developed a clinical test for umami taste sensitivity using a filter paper disc with a range of six monosodium glutamate (MSG) concentrations. We recruited 28 patients with taste disorders (45–78 years) and 184 controls with no taste disorders (102 young [18–25 years] and 82 older [65–89 years] participants). Filter paper discs (5 mm dia.) were soaked in aqueous MSG solutions (1, 5, 10, 50, 100 and 200 mM), then placed on three oral sites innervated by different taste nerves. The lowest concentration participants correctly identified was defined as the recognition threshold (RT) for MSG. This test showed good reproducibility for inter- and intra-observer variability. We concluded that: (1) The RT of healthy controls differed at measurement sites innervated by different taste nerves; that is, the RT of the anterior tongue was higher than that of either the posterior tongue or the soft palate in both young and older individuals. (2) No significant difference in RT was found between young adults and older individuals at any measurement site. (3) The RT of patients with taste disorders was higher before treatment than that of the healthy controls at any measurement site. (4) The RT after treatment in these patients improved to the same level as that of the healthy controls. (5) The cutoff values of RT, showing the highest diagnostic accuracy (true positives + true negatives), were 200 mM MSG for AT and 50 mM MSG for PT and SP. The diagnostic accuracy at these cutoff values was 0.92, 0.87 and 0.86 for AT, PT and SP, respectively. Consequently, this umami taste sensitivity test is useful for discriminating between normal and abnormal umami taste sensations.
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Affiliation(s)
- Shizuko Satoh-Kuriwada
- Division of Oral Diagnosis, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Aoba-ku, Sendai, Japan
- * E-mail: (SS-K); (NS)
| | - Misako Kawai
- Institute for Innovation, Ajinomoto Company Inc., Kawasaki-ku, Kawasaki, Japan
| | - Masahiro Iikubo
- Division of Oral Diagnosis, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Aoba-ku, Sendai, Japan
| | | | - Noriaki Shoji
- Division of Oral Diagnosis, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Aoba-ku, Sendai, Japan
- * E-mail: (SS-K); (NS)
| | - Hisayuki Uneyama
- Institute for Innovation, Ajinomoto Company Inc., Kawasaki-ku, Kawasaki, Japan
| | - Takashi Sasano
- Division of Oral Diagnosis, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Aoba-ku, Sendai, Japan
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Satoh-Kuriwada S, Iikubo M, Shoji N, Sakamoto M, Sasano T. Diagnostic performance of labial minor salivary gland flow measurement for assessment of xerostomia. Arch Oral Biol 2012; 57:1121-6. [PMID: 22673753 DOI: 10.1016/j.archoralbio.2012.05.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Revised: 02/16/2012] [Accepted: 02/28/2012] [Indexed: 11/17/2022]
Abstract
OBJECTIVE Minor salivary gland flow rate (MF) has been proposed as a key feature of xerostomia (subjective feeling of dry mouth). To assess its diagnostic performance, MF was compared in xerostomia and control subjects. DESIGN Sixty-six subjects with xerostomia and 30 controls were enrolled. MF was measured in the lower labial mucosa using the iodine-starch filter paper method. Stimulated whole salivary flow rates were also measured using the gum test (stimulated-WF). RESULTS Both labial-MF and stimulated-WF were significantly lower in xerostomia subjects than in controls. There was a positive correlation between labial-MF and stimulated-WF in control but not xerostomia subjects. In xerostomia subjects compared to controls, there was a significantly larger reduction in labial-MF than in stimulated-WF. Xerostomia was most accurately diagnosed using a labial-MF cutoff value of 0.25 μL/cm(2)/min. The sensitivity, specificity, positive predictive value, negative predictive value, and diagnostic accuracy at this cutoff value were 1.00, 0.87, 0.93, 1.00, and 0.96, respectively. Compared to respective values of 0.64, 1.00, 1.00, 0.56, and 0.75 for stimulated-WF at the traditional cutoff of 1.0 mL/min, these data indicate the higher sensitivity, negative predictive value, and diagnostic accuracy of labial-MF. CONCLUSIONS Xerostomia was more strongly related to reduction of labial-MF than to that of stimulated-WF. Xerostomia was most likely triggered at a labial-MF cut-off value of 0.25 μL/cm(2)/min based on results from the iodine-starch method.
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Affiliation(s)
- Shizuko Satoh-Kuriwada
- Division of Oral Diagnosis, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Seiryo-machi 4-1, Aoba-ku, Sendai 980-8575, Japan
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Sasano T, Satoh-Kuriwada S, Shoji N, Sekine-Hayakawa Y, Kawai M, Uneyama H. Application of Umami Taste Stimulation to Remedy Hypogeusia Based on Reflex Salivation. Biol Pharm Bull 2010; 33:1791-5. [DOI: 10.1248/bpb.33.1791] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Takashi Sasano
- Division of Oral Diagnosis and Radiology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry
| | - Shizuko Satoh-Kuriwada
- Division of Oral Diagnosis and Radiology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry
| | - Noriaki Shoji
- Division of Oral Diagnosis and Radiology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry
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Satoh-Kuriwada S, Shoji N, Kawai M, Uneyama H, Kaneta N, Sasano T. Hyposalivation Strongly Influences Hypogeusia in the Elderly. ACTA ACUST UNITED AC 2009. [DOI: 10.1248/jhs.55.689] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Shizuko Satoh-Kuriwada
- Division of Oral Diagnosis and Radiology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry
| | - Noriaki Shoji
- Division of Oral Diagnosis and Radiology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry
| | | | | | - Naoto Kaneta
- Division of Oral Diagnosis and Radiology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry
| | - Takashi Sasano
- Division of Oral Diagnosis and Radiology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry
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Iwamatsu-Kobayashi Y, Satoh-Kuriwada S, Yamamoto T, Hirata M, Toyoda J, Endo H, Kindaichi K, Komatsu M. A case of multiple idiopathic external root resorption: a 6-year follow-up study. ACTA ACUST UNITED AC 2006; 100:772-9. [PMID: 16301162 DOI: 10.1016/j.tripleo.2004.11.047] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2004] [Revised: 04/27/2004] [Accepted: 11/09/2004] [Indexed: 10/25/2022]
Abstract
Multiple idiopathic external root resorption of permanent teeth is a very infrequent phenomenon. This paper describes a case of multiple idiopathic external root resorption at cement-enamel junction in 21 of 25 teeth followed up for 6 years. In addition to clinical features and radiographs, we present results of histological and bacteriological examinations.
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Affiliation(s)
- Yoko Iwamatsu-Kobayashi
- Division of Operative Dentistry, Department of Restorative Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan.
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Sasano T, Onodera D, Hashimoto K, Iikubo M, Satoh-Kuriwada S, Shoji N, Miyahara T. Possible application of transmitted laser light for the assessment of human pulp vitality. Part 2. Increased laser power for enhanced detection of pulpal blood flow. Dent Traumatol 2005; 21:37-41. [PMID: 15660755 DOI: 10.1111/j.1600-9657.2004.00280.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The purpose of this study was to investigate the effect of an increase in laser power on the transmitted laser signals from vital and non-vital teeth, in the hope of achieving a better assessment of human pulp vitality with the transmitted laser-light flowmeter. The experiments were carried out on total of 61 vital teeth with no restoration (19 upper central incisors, 16 upper lateral incisors, 16 upper canines, and 10 first premolars) and five non-vital upper central incisors (the root canals of which were filled with gutta-percha) in 15 subjects aged 22-28 years. For use with transmitted laser light, the fibers within the probe of a conventional laser Doppler flowmeter (LDF) apparatus were used, one for transmitting light onto the labial surface, the other for receiving it at the palatal surface of the same tooth, as reported previously. Laser output power was set at the original 2 mW and also at 5, 7, and 10 mW. The number of vital teeth displaying a blood flow (BF) signal at each laser power setting was: 1) 12/19 central incisors at 2 mW, 19/19 at 5, 7, and 10 mW, 2) 19/19 lateral incisors at 2, 5, 7, and 10 mW, 3) 0/16 canines at 2 mW, but eight, 12, and 14 at 5, 7, and 10 mW, 4) 0/10 first premolars at 2, 5, 7, and 10 mW. Thus, an increase in laser power increased BF detection from the thicker teeth (but not from premolars). In addition, clearer BF signals synchronized with heart rate, and greater passive BF changes secondary to blood pressure (BP) changes were observed at higher laser settings. In non-vital teeth, no signals synchronized with heart rate or BP changes were observed, indicating that no BF signal of non-pulpal origin was ever monitored with this ballistic light even when the laser power was increased. These results indicate that high-powered transmitted laser light could be a useful tool both for monitoring pulpal BF and for the assessment of tooth-pulp vitality.
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Affiliation(s)
- Takashi Sasano
- Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan.
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Shoji N, Sasano T, Inukai K, Satoh-Kuriwada S, Iikubo M, Furuuchi T, Sakamoto M. A simple, yet accurate method for detecting and quantifying secretions from human minor salivary glands using the iodine-starch reaction. Arch Oral Biol 2003; 48:761-5. [PMID: 14550378 DOI: 10.1016/s0003-9969(03)00157-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The lack of published information about the minor salivary glands is due in part to the difficulties experienced in collecting and quantifying their secretions. In fact, no method exists for measuring their secretions that is both simple and accurate. This investigation examined the accuracy of our newly developed method (which simply employs the iodine-starch reaction) in 10 healthy non-medicated adults. A strip painted with a solution of iodine in absolute alcohol then with a fine starch powder mixed with castor oil was placed at a designated location on the lower-lip mucosa for 2 min to collect saliva. Black-stained spots of various sizes corresponding to the individual glands could be accurately visualized. After removal of the strip, the total stained area (mm2) was calculated by digitizing the spot areas using a computer system. The correlation coefficient (r) between known volumes of saliva and stain size was 0.995, indicating a close correlation. The correlation coefficient (r) between area values obtained in the first trial in each subject (Y) and the second (X; 10 min later) was 0.963, and the simple regression equation was close to Y=X, indicating good reproducibility. The mean flow rate microl/cm2 per min) obtained by converting mean total area to volume and thence to flow rate was 0.49+/-0.26, in good agreement with published values obtained by others. These results suggest that our newly developed method allows both the distribution and secretion rate of the minor salivary glands to be observed, and that it should be of practical value due to its simplicity, accuracy, and reproducibility.
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Affiliation(s)
- N Shoji
- Department of Oral Diagnosis and Radiology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
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Satoh-Kuriwada S, Sasano T, Date H, Karita K, Izumi H, Shoji N, Hashimoto K. Centrally mediated reflex vasodilation in the gingiva induced by painful tooth-pulp stimulation in sympathectomized human subjects. J Periodontal Res 2003; 38:218-22. [PMID: 12608918 DOI: 10.1034/j.1600-0765.2003.02635.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study was designed to determine whether painful electrical stimulation of the tooth pulp induces centrally mediated reflex vasomotor changes in human gingiva and whether the sympathetic nervous system is involved in the vasomotor responses. Dynamic changes in maxillary gingival blood flow (GBF) following painful electrical stimulation of the mandibular lateral incisor were investigated, by means of laser-Doppler flowmetry, in both healthy volunteers and patients undergoing sympathetic blockade for hyperhidrosis. Increases in GBF were observed in both healthy volunteers and patients on the ipsilateral side without an increase in systemic blood pressure, but the evoked GBF increase disappeared when pain sensation was abolished by local anesthetization with 2% xylocaine solution. The vasodilator responses did not differ in amplitude between before and after the sympathectomy. These results suggest that painful tooth stimulation evokes centrally mediated reflex vasodilation, presumably via parasympathetic efferent fibers, in the human gingiva and that sympathetic vasomotor mechanisms are not involved in these responses.
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Affiliation(s)
- S Satoh-Kuriwada
- Division of Oral Diagnosis & Radiology, Tohoku University Graduate School of Dentistry, Sendai, Japan
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