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de Freitas RN, da Silva LGL, Fiais GA, Ferreira DSDB, Veras ASC, Teixeira GR, Oliveira SHP, Dornelles RCM, Nakamune ACDMS, Fakhouri WD, Chaves-Neto AH. Alterations in salivary biochemical composition and redox state disruption induced by the anticonvulsant valproic acid in male rat salivary glands. Arch Oral Biol 2023; 155:105805. [PMID: 37741048 DOI: 10.1016/j.archoralbio.2023.105805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 09/11/2023] [Accepted: 09/12/2023] [Indexed: 09/25/2023]
Abstract
OBJECTIVE To investigate the effects of the anticonvulsant valproic acid (VPA) on salivary glands in male rat using biochemical, functional, histomorphometric, and redox state parameters. MATERIALS AND METHODS Twenty-four male Wistar rats were randomly distributed into three groups (n = 8 per group): Control (0.9% saline solution), VPA100 (100 mg/kg), and VPA400 (400 mg/kg). After 21 consecutive days of treatment with by intragastric gavage. Pilocarpine-induced saliva was collected to determine salivary flow rate, pH, buffering capacity, and biochemical composition. Analyses of histomorphometric parameters and redox balance markers were performed on the parotid and submandibular glands. RESULTS Salivary flow rate, pH, buffering capacity, total protein, potassium, sodium, and chloride were similar between groups. However, phosphate and calcium were reduced in VPA400, while amylase was increased in both VPA100 and VPA400. We did not detect significant differences in the areas of acini, ducts, and connective tissue in the salivary glands between the groups. There were no significant changes in the redox status of the submandibular glands. In turn, in the parotid glands we detected reduced total oxidizing capacity and lipid peroxidation, measured as thiobarbituric acid reactive substances (TBARs) and higher uric acid concentration in both the VPA100 and VPA400 groups, and increased superoxide dismutase (SOD) in the VPA400 group. CONCLUSION Chronic treatment with VPA modified the salivary biochemical composition and caused disruption in the redox state of the parotid gland in rats.
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Affiliation(s)
- Rayara Nogueira de Freitas
- Department of Basic Sciences, São Paulo State University (Unesp), School of Dentistry, Araçatuba, São Paulo, Brazil; Programa de Pós-Graduação em Ciências - Saúde Bucal da Criança, São Paulo State University (Unesp), School of Dentistry, Araçatuba, São Paulo, Brazil
| | | | - Gabriela Alice Fiais
- Department of Basic Sciences, São Paulo State University (Unesp), School of Dentistry, Araçatuba, São Paulo, Brazil; Programa de Pós-Graduação Multicêntrico em Ciências Fisiológicas - SBFis, São Paulo State University (Unesp), School of Dentistry, Araçatuba, São Paulo, Brazil
| | | | - Allice Santos Cruz Veras
- Department of Physical Education, São Paulo State University (Unesp), School of Technology and Sciences, Presidente Prudente, São Paulo, Brazil; Programa de Pós-Graduação Multicêntrico em Ciências Fisiológicas - SBFis, São Paulo State University (Unesp), School of Dentistry, Araçatuba, São Paulo, Brazil
| | - Giovana Rampazzo Teixeira
- Department of Physical Education, São Paulo State University (Unesp), School of Technology and Sciences, Presidente Prudente, São Paulo, Brazil; Programa de Pós-Graduação Multicêntrico em Ciências Fisiológicas - SBFis, São Paulo State University (Unesp), School of Dentistry, Araçatuba, São Paulo, Brazil
| | - Sandra Helena Penha Oliveira
- Department of Basic Sciences, São Paulo State University (Unesp), School of Dentistry, Araçatuba, São Paulo, Brazil; Programa de Pós-Graduação Multicêntrico em Ciências Fisiológicas - SBFis, São Paulo State University (Unesp), School of Dentistry, Araçatuba, São Paulo, Brazil
| | - Rita Cássia Menegati Dornelles
- Department of Basic Sciences, São Paulo State University (Unesp), School of Dentistry, Araçatuba, São Paulo, Brazil; Programa de Pós-Graduação Multicêntrico em Ciências Fisiológicas - SBFis, São Paulo State University (Unesp), School of Dentistry, Araçatuba, São Paulo, Brazil
| | | | - Walid D Fakhouri
- Center for Craniofacial Research, Department of Diagnostic and Biomedical Sciences, School of Dentistry, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Antonio Hernandes Chaves-Neto
- Department of Basic Sciences, São Paulo State University (Unesp), School of Dentistry, Araçatuba, São Paulo, Brazil; Programa de Pós-Graduação em Ciências - Saúde Bucal da Criança, São Paulo State University (Unesp), School of Dentistry, Araçatuba, São Paulo, Brazil; Programa de Pós-Graduação Multicêntrico em Ciências Fisiológicas - SBFis, São Paulo State University (Unesp), School of Dentistry, Araçatuba, São Paulo, Brazil.
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Yoshikawa M, Okubo M, Shirose K, Kan T, Kawaguchi M. d-Serine Increases Release of Acetylcholine in Rat Submandibular Glands. BIOLOGY 2023; 12:1227. [PMID: 37759626 PMCID: PMC10526048 DOI: 10.3390/biology12091227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 08/10/2023] [Accepted: 09/07/2023] [Indexed: 09/29/2023]
Abstract
d-serine has been observed in submandibular gland tissue in rats, but its functions remain to be clarified. Oral administration of d-serine, but not l-serine, increased its concentrations in the submandibular gland and pilocarpine-induced salivary secretion. In vivo microdialysis was used to collect the d- and l-enantiomers of amino acids from local interstitial fluid in the rat submandibular gland. The proportion of the d-form of serine in interstitial fluid was higher than that in plasma or saliva. Perfusion of the rat submandibular gland with d-serine and l-glutamic acid via the submandibular gland artery resulted in a significant increase in salivary secretion after stimulation of muscarinic receptors with carbachol. In vivo microdialysis applied to the submandibular glands of rats showed that infusion of d-serine along with l-glutamate through the microdialysis probe significantly elevated acetylcholine levels in local interstitial fluids in the submandibular glands of anesthetized rats as compared to that with l-glutamate alone in an N-methyl-d-aspartate receptor glycine site antagonist-sensitive manner. These results indicate that d-serine augments salivary secretion by increasing acetylcholine release in the salivary glands.
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Affiliation(s)
- Masanobu Yoshikawa
- Department of Clinical Pharmacology, School of Medicine, Tokai University, Isehara 259-1193, Japan
| | - Migiwa Okubo
- Kawano Dental Clinic, Yachimata 289-1101, Japan;
| | - Kosuke Shirose
- Department of Anesthesiology, School of Medicine, Tokai University, Isehara 259-1193, Japan; (K.S.); (T.K.)
| | - Takugi Kan
- Department of Anesthesiology, School of Medicine, Tokai University, Isehara 259-1193, Japan; (K.S.); (T.K.)
| | - Mitsuru Kawaguchi
- Tokyo Dental College, Misaki-cho, Chiyoda-ku, Tokyo 101-0061, Japan;
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Masuda K, Furuyama A, Ohsuga K, Abe S, Kawaai H. Effect of propofol on salivary secretion from the submandibular, sublingual, and labial glands during intravenous sedation. J Dent Anesth Pain Med 2023; 23:153-162. [PMID: 37313266 PMCID: PMC10260352 DOI: 10.17245/jdapm.2023.23.3.153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 03/28/2023] [Accepted: 04/25/2023] [Indexed: 06/15/2023] Open
Abstract
Background Recent animal studies have suggested the role of GABA type A (GABA-A) receptors in salivation, showing that GABA-A receptor agonists inhibit salivary secretion. This study aimed to evaluate the effects of propofol (a GABA-A agonist) on salivary secretions from the submandibular, sublingual, and labial glands during intravenous sedation in healthy volunteers. Methods Twenty healthy male volunteers participated in the study. They received a loading dose of propofol 6 mg/kg/h for 10 min, followed by 3 mg/kg/h for 15 min. Salivary flow rates in the submandibular, sublingual, and labial glands were measured before, during, and after propofol infusion, and amylase activity was measured in the saliva from the submandibular and sublingual glands. Results We found that the salivary flow rates in the submandibular, sublingual, and labial glands significantly decreased during intravenous sedation with propofol (P < 0.01). Similarly, amylase activity in the saliva from the submandibular and sublingual glands was significantly decreased (P < 0.01). Conclusion It can be concluded that intravenous sedation with propofol decreases salivary secretion in the submandibular, sublingual, and labial glands via the GABA-A receptor. These results may be useful for dental treatment when desalivation is necessary.
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Affiliation(s)
- Keisuke Masuda
- Department of Oral Function and Molecular Biology, Ohu University School of Dentistry, Fukushima, Japan
| | - Akira Furuyama
- Department of Oral Function and Molecular Biology, Ohu University School of Dentistry, Fukushima, Japan
| | - Kenji Ohsuga
- Department of Oral Function and Molecular Biology, Ohu University School of Dentistry, Fukushima, Japan
| | - Shota Abe
- Department of Dental Anesthesiology, Ohu University School of Dentistry, Fukushima, Japan
| | - Hiroyoshi Kawaai
- Department of Oral Function and Molecular Biology, Ohu University School of Dentistry, Fukushima, Japan
- Department of Dental Anesthesiology, Ohu University Dental Hospital, Fukushima, Japan
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Mukai A, Irifune M, Shimizu Y, Doi M, Kikuchi Y, Katayama S, Oue K, Yoshida M, Ago Y, Okada Y, Morioka N, Nakata Y, Sakai N. N-methyl-d-aspartate receptors and glycinergic transmission, respectively, mediate muscle relaxation and immobility of pentobarbital in mice. Neurosci Lett 2023; 802:137175. [PMID: 36907265 DOI: 10.1016/j.neulet.2023.137175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 03/01/2023] [Accepted: 03/07/2023] [Indexed: 03/14/2023]
Abstract
Pentobarbital-induced anesthesia is believed to be mediated by enhancement of the inhibitory action of γ-aminobutyric acid (GABA)ergic neurons in the central nervous system. However, it is unclear whether all components of anesthesia induced by pentobarbital, such as muscle relaxation, unconsciousness, and immobility in response to noxious stimuli, are mediated only through GABAergic neurons. Thus, we examined whether the indirect GABA and glycine receptor agonists gabaculine and sarcosine, respectively, the neuronal nicotinic acetylcholine receptor antagonist mecamylamine, or the N-methyl-d-aspartate receptor channel blocker MK-801 could enhance pentobarbital-induced components of anesthesia. Muscle relaxation, unconsciousness, and immobility were evaluated by grip strength, the righting reflex, and loss of movement in response to nociceptive tail clamping, respectively, in mice. Pentobarbital reduced grip strength, impaired the righting reflex, and induced immobility in a dose-dependent manner. The change in each behavior induced by pentobarbital was roughly consistent with that in electroencephalographic power. A low dose of gabaculine, which significantly increased endogenous GABA levels in the central nervous system but had no effect on behaviors alone, potentiated muscle relaxation, unconsciousness, and immobility induced by low pentobarbital doses. A low dose of MK-801 augmented only the masked muscle-relaxing effects of pentobarbital among these components. Sarcosine enhanced only pentobarbital-induced immobility. Conversely, mecamylamine had no effect on any behavior. These findings suggest that each component of anesthesia induced by pentobarbital is mediated through GABAergic neurons and that pentobarbital-induced muscle relaxation and immobility may partially be associated with N-methyl-d-aspartate receptor antagonism and glycinergic neuron activation, respectively.
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Affiliation(s)
- Akari Mukai
- Department of Dental Anesthesiology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
| | - Masahiro Irifune
- Department of Dental Anesthesiology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
| | - Yoshitaka Shimizu
- Department of Dental Anesthesiology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
| | - Mitsuru Doi
- Department of Dental Anesthesiology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
| | - Yuka Kikuchi
- Section of Dental Anesthesiology, Department of Oral & Maxillofacial Surgery and Oral Medicine, Hiroshima University Hospital, Hiroshima, Japan
| | - Sotaro Katayama
- Section of Dental Anesthesiology, Department of Oral & Maxillofacial Surgery and Oral Medicine, Hiroshima University Hospital, Hiroshima, Japan.
| | - Kana Oue
- Section of Dental Anesthesiology, Department of Oral & Maxillofacial Surgery and Oral Medicine, Hiroshima University Hospital, Hiroshima, Japan.
| | - Mitsuhiro Yoshida
- Section of Dental Anesthesiology, Department of Oral & Maxillofacial Surgery and Oral Medicine, Hiroshima University Hospital, Hiroshima, Japan.
| | - Yukio Ago
- Department of Cellular and Molecular Pharmacology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
| | - Yoshiyuki Okada
- Department of Special Care Dentistry, Hiroshima University Hospital, Hiroshima, Japan.
| | - Norimitsu Morioka
- Department of Pharmacology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
| | - Yoshihiro Nakata
- Department of Pharmacology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
| | - Norio Sakai
- Department of Molecular and Pharmacological Neuroscience, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
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Lorazepam induces acinar cells apoptosis of rat parotid glands. Saudi Dent J 2020; 32:276-282. [PMID: 32874067 PMCID: PMC7452012 DOI: 10.1016/j.sdentj.2019.09.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 09/20/2019] [Accepted: 09/24/2019] [Indexed: 11/20/2022] Open
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Bazzano M, Laghi L, Zhu C, Lotito E, Sgariglia S, Tesei B, Laus F. Exercise Induced Changes in Salivary and Serum Metabolome in Trained Standardbred, Assessed by 1H-NMR. Metabolites 2020; 10:metabo10070298. [PMID: 32708237 PMCID: PMC7407172 DOI: 10.3390/metabo10070298] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 07/15/2020] [Accepted: 07/20/2020] [Indexed: 12/24/2022] Open
Abstract
In the present study, data related to the metabolomics of saliva and serum in trained standardbred horses are provided for the first time. Metabolomic analysis allows to analyze all the metabolites within selected biofluids, providing a better understanding of biochemistry modifications related to exercise. On the basis of the current advances observed in metabolomic research on human athletes, we aimed to investigate the metabolites’ profile of serum and saliva samples collected from healthy standardbred horses and the relationship with physical exercise. Twelve trained standardbred horses were sampled for blood and saliva before (T0) and immediately after (T1) standardized exercise. Metabolomic analysis of both samples was performed by 1H-NMR spectroscopy. Forty-six metabolites in serum and 62 metabolites in saliva were detected, including alcohols, amino acids, organic acids, carbohydrates and purine derivatives. Twenty-six and 14 metabolites resulted to be significantly changed between T0 and T1 in serum and saliva, respectively. The findings of 2-hydroxyisobutyrate and 3-hydroxybutyrate in serum and GABA in equine saliva, as well as their modifications following exercise, provide new insights about the physiology of exercise in athletic horses. Glycerol might represent a novel biomarker for fitness evaluation in sport horses.
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Affiliation(s)
- Marilena Bazzano
- School of Biosciences and Veterinary Medicine, University of Camerino, Via Circonvallazione, 93/95, 62024 Matelica, Italy; (M.B.); (E.L.); (B.T.); (F.L.)
| | - Luca Laghi
- Department of Agricultural and Food Sciences, University of Bologna, 47521 Cesena, Italy;
- Correspondence:
| | - Chenglin Zhu
- Department of Agricultural and Food Sciences, University of Bologna, 47521 Cesena, Italy;
| | - Enrica Lotito
- School of Biosciences and Veterinary Medicine, University of Camerino, Via Circonvallazione, 93/95, 62024 Matelica, Italy; (M.B.); (E.L.); (B.T.); (F.L.)
| | | | - Beniamino Tesei
- School of Biosciences and Veterinary Medicine, University of Camerino, Via Circonvallazione, 93/95, 62024 Matelica, Italy; (M.B.); (E.L.); (B.T.); (F.L.)
| | - Fulvio Laus
- School of Biosciences and Veterinary Medicine, University of Camerino, Via Circonvallazione, 93/95, 62024 Matelica, Italy; (M.B.); (E.L.); (B.T.); (F.L.)
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Pidsaya A, Kamnate A, Sirisin J, Watanabe M, Kondo H, Hipkaeo W. Different expression and subcellular localization of vesicular inhibitory amino acid transporter in ducts of major salivary glands: An in situ study in mice. Arch Oral Biol 2020; 113:104689. [PMID: 32135333 DOI: 10.1016/j.archoralbio.2020.104689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Revised: 02/25/2020] [Accepted: 02/26/2020] [Indexed: 10/24/2022]
Abstract
OBJECTIVE The aim of this study was to clarify the mechanism of GABA (□-amino butyric acid)-signaling in the salivary glands by localization of vesicular inhibitory amino acid transporter, a key molecule in GABA-synthesis. DESIGN Parotid, sublingual and submandibular glands of mice at various postnatal stages were examined in immuno-light and electron microscopy as well as immuno-blotting. RESULTS Expression for vesicular inhibitory amino acid transporter was detected in parotid and sublingual glands of both sexes and female submandibular gland throughout postnatal development, while it was negligible in male submandibular glands at and after puberty. The expression in female submandibular glands attenuated after testosterone injection. The immunoreactivity was localized in striated ductal cells, but not acinar cells, in the salivary glands, and it occurred in association with intracellular and plasma membranes of the cells. It also occurred in myoepithelial and vascular smooth muscle cells. CONCLUSIONS GABA-signaling was suggested to be a significant signaling pathway in salivary ductal cells, which was suppressed in male submandibular glands at and after puberty. The suppression in the submandibular duct was by testosterone. In addition, the participation of vesicular inhibitory amino acid transporter in GABA signaling through plasma membranes of the ductal cells was suggested. The significance of occurrence of the immunoreactivity in myoepithelial and smooth muscle cells remains to be further elucidated in terms of implication in GABA signaling.
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Affiliation(s)
- Atthapon Pidsaya
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Anussara Kamnate
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Juthathip Sirisin
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Masahiko Watanabe
- Department of Anatomy, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Hisatake Kondo
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand; Department of Anatomy, Graduate School of Medicine, Tohoku University, Sendai, Japan
| | - Wiphawi Hipkaeo
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand.
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Mattioli TMF, Alanis LRA, Sapelli SDS, de Lima AAS, de Noronha L, Rosa EAR, Althobaiti YS, Almalki AH, Sari Y, Ignacio SA, Johann ACBR, Gregio AMT. Effects of Benzodiazepines on Acinar and Myoepithelial Cells. Front Pharmacol 2016; 7:173. [PMID: 27445812 PMCID: PMC4919344 DOI: 10.3389/fphar.2016.00173] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 06/03/2016] [Indexed: 01/21/2023] Open
Abstract
Background: Benzodiazepines (BZDs), the most commonly prescribed psychotropic drugs with anxiolytic action, may cause hyposalivation. It has been previously shown that BZDs can cause hypertrophy and decrease the acini cell number. In this study, we investigated the effects of BZDs and pilocarpine on rat parotid glands, specifically on acinar, ductal, and myoepithelial cells. Methods: Ninety male Wistar rats were divided into nine groups. Control groups received a saline solution for 30 days (C30) and 60 days (C60), and pilocarpine (PILO) for 60 days. Experimental groups received lorazepam (L30) and midazolam (M30) for 30 days. Another group (LS60 or MS60) received lorazepam or midazolam for 30 days, respectively, and saline for additional 30 days. Finally, other groups (LP60 or MP60) received either lorazepam or midazolam for 30 days, respectively, and pilocarpine for additional 30 days. The expression of calponin in myoepithelial cells and the proliferating cell nuclear antigen (PCNA) in acinar and ductal cells were evaluated. Results: Animals treated with lorazepam showed an increase in the number of positive staining cells for calponin as compared to control animals (p < 0.05). Midazolam administered with pilocarpine (MP60) induced an increase in the proliferation of acinar and ductal cells and a decrease in the positive staining cells for calponin as compared to midazolam administered with saline (MS60). Conclusion: We found that myoepithelial cells might be more sensitive to the effects of BZD than acinar and ductal cells in rat parotid glands.
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Affiliation(s)
- Tatiana M F Mattioli
- Pharmacology and Experimental Pathology, School of Dentistry, Pontifical Catholic University of Paraná Curitiba, Brazil
| | - Luciana R A Alanis
- Program of Post-Graduation, School of Dentistry, Health and Bioscience School, Pontifical Catholic University of Paraná Curitiba, Brazil
| | - Silvana da Silva Sapelli
- Pharmacology and Experimental Pathology, School of Dentistry, Pontifical Catholic University of Paraná Curitiba, Brazil
| | - Antonio A S de Lima
- Department of Oral Pathology, School of Dentistry, Federal University of Paraná Curitiba, Brazil
| | - Lucia de Noronha
- Program of Post-Graduation, Department of Pathology, School of Medicine, Pontifical Catholic University of Paraná Curitiba, Brazil
| | - Edvaldo A R Rosa
- Program of Post-Graduation, School of Dentistry, Health and Bioscience School, Pontifical Catholic University of Paraná Curitiba, Brazil
| | - Yusuf S Althobaiti
- Department of Pharmacology, College of Pharmacy and Pharmaceutical, The University of Toledo Toledo, OH, US
| | - Atiah H Almalki
- Department of Pharmacology, College of Pharmacy and Pharmaceutical, The University of Toledo Toledo, OH, US
| | - Youssef Sari
- Department of Pharmacology, College of Pharmacy and Pharmaceutical, The University of Toledo Toledo, OH, US
| | - Sergio A Ignacio
- Program of Post-Graduation, School of Dentistry, Health and Bioscience School, Pontifical Catholic University of Paraná Curitiba, Brazil
| | - Aline C B R Johann
- Program of Post-Graduation, School of Dentistry, Health and Bioscience School, Pontifical Catholic University of Paraná Curitiba, Brazil
| | - Ana M T Gregio
- Department of Pharmacology, College of Pharmacy and Pharmaceutical, The University of ToledoToledo, OH, US; Program of Post-Graduation, Department of Pharmacology, School of Dentistry, Health and Bioscience School, Pontifical Catholic University of ParanáCuritiba, Brazil
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Okubo M, Kawaguchi M. Rat submandibular gland perfusion method for clarifying inhibitory regulation of GABAA receptor. J Pharmacol Sci 2013; 122:42-50. [PMID: 23685805 DOI: 10.1254/jphs.12241fp] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
GABA is an inhibitory transmitter found in rat salivary gland. However, the inhibitory potential of GABA on salivary secretion is unclear. Using an in vivo cannulation method, intraperitoneal administration of GABA was ineffective in the absence of gabaculine, a GABA transaminase inhibitor, on pilocarpine-induced salivary secretion, suggesting that GABA was rendered metabolically inactive before reaching the salivary gland. We hypothesized that the action of a drug on the salivary glands could be measured directly using a submandibular gland perfusion system. The submandibular gland artery, veins, and duct were cannulated in situ so that physiological functions such as innervation would not be compromised. Hank's balanced salt solution (pH 7.4) was perfused at a rate of 0.5 ml/min together with 1 μM carbachol (CCh) over a 5-min period every 30 min. Amount of secreted saliva showed no change to the recurrent addition of CCh to the perfusate. GABA or muscimol dose-dependently inhibited CCh-induced salivary secretion. This effect was blocked by bicuculline, a GABA(A)-receptor (GABA(A)-R) antagonist, and enhanced by clonazepam, a central-type benzodiazepine-receptor agonist. These results suggest that salivary secretion is suppressed by GABA(A)-R in rat salivary gland and that the perfusion method used was effective in clarifying inhibitory regulation of GABA(A)-R.
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Affiliation(s)
- Migiwa Okubo
- Oral Health Science Center hrc8, Tokyo Dental College, Japan.
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Gamma-aminobutyric acid concentrations in benign parotid tumours and unstimulated parotid saliva. The Journal of Laryngology & Otology 2010; 125:492-6. [PMID: 21205370 DOI: 10.1017/s0022215110002574] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
OBJECTIVE Apart from its role as an inhibitory neurotransmitter, γ-aminobutyric acid is also thought to regulate various stages of cell proliferation and differentiation in the brain and periphery. The present study aimed to assess the levels of γ-aminobutyric acid and its biochemical precursor glutamic acid (glutamate) in benign parotid tumours and in unstimulated parotid saliva. METHOD Unstimulated parotid saliva was collected bilaterally, using the swab method, in 20 patients with unilateral pleomorphic adenoma or Warthin's tumour. Samples of tumour and adjacent salivary tissue were collected during tumour resection. RESULTS Concentrations of γ-aminobutyric acid and glutamate, but not aspartate, were significantly higher in the tumour tissue than in the non-tumour tissue. There was no significant difference in salivary concentrations of γ-aminobutyric acid, glutamate or aspartate, comparing the involved and non-involved side. CONCLUSION The present results provide preliminary evidence that γ-aminobutyric acid may be involved in the growth of benign parotid tumours.
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Okubo M, Kawaguchi M. Co-operative Effect Between γ-Aminobutyric Acid A Receptors and Central-Type Benzodiazepine Receptors on Amylase Release in Rat Parotid Acinar Cells. J Pharmacol Sci 2010; 112:247-50. [DOI: 10.1254/jphs.09269sc] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Kosuge Y, Kawaguchi M, Sawaki K, Okubo M, Shinomiya T, Sakai T. Immunohistochemical study on GABAergic system in salivary glands. Eur J Pharmacol 2009; 610:18-22. [PMID: 19292982 DOI: 10.1016/j.ejphar.2009.02.043] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2008] [Revised: 01/28/2009] [Accepted: 02/09/2009] [Indexed: 11/19/2022]
Abstract
Gamma-aminobutyric acid (GABA) and its receptors are found in the central nervous system and several peripheral tissues. The purpose of this study was to determine the expression and distribution of GABA and glutamate decarboxylase (GAD), a GABA biosynthetic enzyme, in rat salivary gland. Western blot and real time quantitative RT-PCR revealed that GAD67 was the major isoform of GAD in the salivary glands. Furthermore, both GABA and GAD were detected around the acinar cells in the submandibular glands by immunohistochemical analysis. When both sympathetic and parasympathetic nerves related to the submandibular glands were denervated, the immunoreactivities of GABA and GAD were dramatically depressed, and levels of GAD67 and GABA significantly decreased. However, no morphological changes in the glands were observed after denervation. These results indicate that GAD67 is present around acinar cells in the salivary glands, and suggest that the GABAergic system in the glands is closely related to the autonomic nervous system.
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Affiliation(s)
- Yasuhiro Kosuge
- Department of Pharmacology and Oral Health Science Center, Tokyo Dental College, 1-2-2 Masago, Mihama-ku, Chiba 261-8502, Japan
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Ahmed AO, Sharifzadeh M, Nikfar S, Jamshidi HR, Abdollahi M. Prevention by L-Arginine/Nitric Oxide of Chlordiazepoxide-Induced Toxic Reactions in the Rat Salivary Gland. Toxicol Mech Methods 2008; 16:331-7. [DOI: 10.1080/15376520600620067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Ishikawa Y, Cho G, Yuan Z, Skowronski MT, Pan Y, Ishida H. Water channels and zymogen granules in salivary glands. J Pharmacol Sci 2006; 100:495-512. [PMID: 16799262 DOI: 10.1254/jphs.crj06007x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
Abstract
Salivary secretion occurs in response to stimulation by neurotransmitters released from autonomic nerve endings. The molecular mechanisms underlying the secretion of water, a main component of saliva, from salivary glands are not known; the plasma membrane is a major barrier to water transport. A 28-kDa integral membrane protein, distributed in highly water-permeable tissues, was identified as a water channel protein, aquaporin (AQP). Thirteen AQPs (AQP0 - AQP12) have been identified in mammals. AQP5 is localized in lipid rafts under unstimulated conditions and translocates to the apical plasma membrane in rat parotid glands upon stimulation by muscarinic agonists. The importance of increases in intracellular calcium concentration [Ca(2+)](i) and the nitric oxide synthase and protein kinase G signaling pathway in the translocation of AQP5 is reviewed in section I. Signals generated by the activation of Ca(2+) mobilizing receptors simultaneously trigger and regulate exocytosis. Zymogen granule exocytosis occurs under the control of essential process, stimulus-secretion coupling, in salivary glands. Ca(2+) signaling is a principal signal in both protein and water secretion from salivary glands induced by cholinergic stimulation. On the other hand, the cyclic adenosine monophosphate (cAMP)/cAMP-dependent protein kinase system has a major role in zymogen granule exocytosis without significant increases in [Ca(2+)](i). In section II, the mechanisms underlying the control of salivary protein secretion and its dysfunction are reviewed.
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Affiliation(s)
- Yasuko Ishikawa
- Department of Pharmacology, The University of Tokushima School of Dentistry, Tokushima, Japan.
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Okubo M, Kawaguchi M. Inhibitory regulation of amylase release in rat parotid acinar cells by benzodiazepine receptors. Eur J Pharmacol 1998; 359:243-9. [PMID: 9832396 DOI: 10.1016/s0014-2999(98)00628-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This study examined the influence of benzodiazepine receptors on amylase release from rat parotid acinar cells. Diazepam (10(-8)-10(-6) M), which is a potent agonist of both central- and peripheral-type benzodiazepine receptors, dose dependently decreased amylase release induced by isoprenaline and carbachol, which are beta-adrenoceptor and muscarinic receptor agonists, respectively. The maximum inhibitory response was obtained with 10(-6) M diazepam: amylase release was decreased to 57% (isoprenaline) and 39% (carbachol) of maximal levels, while these responses were completely inhibited by propranolol and atropine, respectively. Clonazepam and 7-chloro-1,3-dihydro-1-methyl-5-p-chlorophenyl)-2H-1,4-benzodiazepine-2- one (Ro 5-4864), which are selective agonists of central- and peripheral-type benzodiazepine receptors, respectively, also produced a significant and dose-dependent decrease in isoprenaline-induced amylase release. The inhibitory potency was diazepam > clonazepam > Ro 5-4864. Flumazenil and 1-(2-chlorophenyl)-N-methyl-N-(1-methylpropyl)-3-isoquinoline carboxamide (PK 11195), which are selective antagonists of central- and peripheral-type benzodiazepine receptors, respectively, dose dependently blocked the inhibition of isoprenaline-induced amylase release by diazepam. At a concentration of 10(-5) M, flumazenil and PK 11195 restored amylase release to approximately 75% of that in the presence of isoprenaline alone. The combination of both antagonists completely prevented the inhibition by diazepam. Similarly, the inhibitory responses of clonazepam and Ro 5-4864 were completely blocked by flumazenil and PK 11195, respectively. These results suggest that, in rat parotid acinar cells, benzodiazepines inhibit beta-adrenoceptor and muscarinic receptor-stimulated amylase release and that both central- and peripheral-type benzodiazepine receptors contribute to this inhibitory regulation.
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Affiliation(s)
- M Okubo
- Department of Pharmacology and Oral Health Science Center, Tokyo Dental College, Chiba, Japan
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Kwan YW, Ngan MP, Tsang KY, Lee HM, Chu LA. Presynaptic modulation by L-glutamate and GABA of sympathetic co-transmission in rat isolated vas deferens. Br J Pharmacol 1996; 118:755-61. [PMID: 8762104 PMCID: PMC1909721 DOI: 10.1111/j.1476-5381.1996.tb15464.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
1. The modulatory effects of L-glutamate and its structural analogues, and of gamma-aminobutyric acid (GABA), on sympathetic co-transmission were studied in the rat isolated vas deferens exposed to electrical field stimulation (EFS). 2. Application of exogenous L-glutamate caused a concentration-dependent (1 microM-3 mM) inhibition of the rapid twitch component of the biphasic EFS contraction. However, L-glutamate (1 microM-3 mM) had a minimal effect on the phasic contraction induced by exogenous adenosine 5'-triphosphate (ATP, 150 microM) and noradrenaline (50 microM). Unlike L-glutamate, D-glutamate had no effect on the EFS contraction. 3. The L-glutamate-induced inhibition of the EFS contractions was significantly attenuated by the glutamate decarboxylase (GAD) inhibitor 3-mercapto-propionic acid (150 microM) and was abolished in the presence of the GABA transaminase (GABA-T) inhibitor, 2-aminoethyl hydrogen sulphate (500 microM). 4. The L-glutamate-induced inhibition of the electrically evoked contraction was not affected by the adenosine A1-receptor antagonist, 8-cyclopentyl-1,3-dipropylxanthine (DPCPX)(30 nM), reactive blue 2 (30 microM) or the GABAA receptor antagonist bicuculline (50 microM). However, the GABAB receptor antagonist 2-hydroxysaclofen (50 microM) significantly inhibited the L-glutamate effect. 5. Similar to L-glutamate, GABA also caused a concentration-dependent (0.1-100 microM) inhibition of the EFS contractions. This GABA-induced inhibition was not affected by either the GABAA receptor antagonist bicuculline (50 microM) or reactive blue 2 (30 microM). However, a significant attenuation of the GABA-mediated effect was recorded with the GABAB receptor antagonist 2-hydroxysaclofen (50 microM). Contractions of the vas deferens induced by exogenous ATP and noradrenaline were not affected by GABA (0.1-100 microM). 6. The L-glutamate analogues, N-methyl-D-aspartate (NMDA) (1 microM-1 mM) and quisqualate (Quis 0.1 microM-0.3 mM) had no effect, whilst kainate (Kain, 1 microM-1 mM) caused an inhibition of the EFS-induced contractions. Effects of Kain could be abolished by the non-NMDA receptor antagonist 6-cyano-7-nitroquinoxaline-2,3-dioxine (CNQX, 10 microM). NMDA, Quis and Kain had no effect on the exogenous ATP- or noradrenaline-induced contractions. 7. It is concluded that the excitatory amino acid L-glutamate modulates the electrically evoked vas deferens contraction through conversion to the inhibitory amino acid GABA by a specific GABA transaminase. The GABA formed may then act on GABAB receptors and cause inhibition of the contraction through a presynaptic mechanism.
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Affiliation(s)
- Y W Kwan
- Department of Pharmacology, Faculty of Medicine, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
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