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Zhou Q, Chen Y, Liu G, Qiao P, Tang C. A preliminary study of the salivary microbiota of young male subjects before, during, and after acute high-altitude exposure. PeerJ 2023; 11:e15537. [PMID: 37397022 PMCID: PMC10312199 DOI: 10.7717/peerj.15537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 05/19/2023] [Indexed: 07/04/2023] Open
Abstract
Background The microbial community structure in saliva differs at different altitudes. However, the impact of acute high-altitude exposure on the oral microbiota is unclear. This study explored the impact of acute high-altitude exposure on the salivary microbiome to establish a foundation for the future prevention of oral diseases. Methods. Unstimulated whole saliva samples were collected from 12 male subjects at the following three time points: one day before entering high altitude (an altitude of 350 m, pre-altitude group), seven days after arrival at high altitude (an altitude of 4,500 m, altitude group) and seven days after returning to low altitude (an altitude of 350 m, post-altitude group). Thus, a total of 36 saliva samples were obtained. 16S rRNA V3-V4 region amplicon sequencing was used to analyze the diversity and structure of the salivary microbial communities, and a network analysis was employed to investigate the relationships among salivary microorganisms. The function of these microorganisms was predicted with a Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt) analysis. Results In total, there were 756 operational taxonomic units (OTUs) identified, with 541, 613, and 615 OTUs identified in the pre-altitude, altitude, and post-altitude groups, respectively. Acute high-altitude exposure decreased the diversity of the salivary microbiome. Prior to acute high-altitude exposure, the microbiome mainly consisted of Proteobacteria, Firmicutes, Bacteroidetes, Fusobacteria, and Actinobacteria. After altitude exposure, the relative abundance of Streptococcus and Veillonella increased, and the relative abundance of Prevotella, Porphyromonas, and Alloprevotella decreased. The relationship among the salivary microorganisms was also affected by acute high-altitude exposure. The relative abundance of carbohydrate metabolism gene functions was upregulated, while the relative abundance of coenzyme and vitamin metabolism gene functions was downregulated. Conclusion Rapid high-altitude exposure decreased the biodiversity of the salivary microbiome, changing the community structure, symbiotic relationships among species, and abundance of functional genes. This suggests that the stress of acute high-altitude exposure influenced the stability of the salivary microbiome.
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Affiliation(s)
- Qian Zhou
- The fifth Clinical Medical College of Anhui Medical University, Clinical College of Anhui Medical University, Beijing, China
- Department of Stomatology, PLA Strategic Support Force Medical Center, Beijing, China
| | - Yuhui Chen
- Department of Stomatology, PLA Strategic Support Force Medical Center, Beijing, China
| | - Guozhu Liu
- The 32183 Military Hospital of PLA, Baicheng, Jilin, China
| | - Pengyan Qiao
- Department of Stomatology, PLA Strategic Support Force Medical Center, Beijing, China
| | - Chuhua Tang
- The fifth Clinical Medical College of Anhui Medical University, Clinical College of Anhui Medical University, Beijing, China
- Department of Stomatology, PLA Strategic Support Force Medical Center, Beijing, China
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Dodds MWJ, Haddou MB, Day JEL. The effect of gum chewing on xerostomia and salivary flow rate in elderly and medically compromised subjects: a systematic review and meta-analysis. BMC Oral Health 2023; 23:406. [PMID: 37340436 DOI: 10.1186/s12903-023-03084-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Accepted: 05/26/2023] [Indexed: 06/22/2023] Open
Abstract
BACKGROUND Xerostomia negatively affects quality of life. Symptoms include oral dryness; thirst; difficulty speaking, chewing, and swallowing food; oral discomfort; mouth soft tissue soreness and infections; and rampant tooth decay. The objective of this systematic review and meta-analysis was to investigate if gum chewing is an intervention that results in objective improvements in salivary flow rates and subjective relief from xerostomia. METHOD We searched electronic databases including Medline, Scopus, Web of Science, Embase, Cochrane Library (CDSR and Central), Google Scholar and the citations of review papers (last searched 31/03/23). The study populations included: 1) elderly people with xerostomia (> 60 years old, any gender, and severity of xerostomia), and 2) medically compromised people with xerostomia. The intervention of interest was gum chewing. Comparisons included gum chewing vs. no gum chewing. The outcomes included salivary flow rate, self-reported xerostomia, and thirst. All settings and study designs were included. We conducted a meta-analysis on studies where measurements of unstimulated whole salivary flow rate for both a gum chewing, and no gum chewing intervention (daily chewing of gum for two weeks or longer) were reported. We assessed risk of bias using Cochrane's RoB 2 and ROBINS-I tools. RESULTS Nine thousand six hundred and two studies were screened and 0.26% (n = 25) met the inclusion criteria for the systematic review. Two of the 25 papers had a high overall risk of bias. Of the 25 papers selected for the systematic review, six met the criteria to be included in the meta-analysis which confirmed a significant overall effect of gum on saliva flow outcomes compared to control (SMD = 0.44, 95% CI: 0.22-0.66; p = 0.00008; I2 = 46.53%). CONCLUSIONS Chewing gum can increase unstimulated salivary flow rate in elderly and medically compromised people with xerostomia. Increasing the number of days over which gum is chewed increases the improvement in the rate of salivation. Gum chewing is linked with improvements in self-reported levels of xerostomia (although it is noted that no significant effects were detected in five of the studies reviewed). Future studies should eliminate sources of bias, standardise methods to measure salivary flow rate, and use a common instrument to measure subjective relief from xerostomia. STUDY REGISTRATION PROSPERO CRD42021254485.
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Affiliation(s)
| | | | - Jon E L Day
- Cerebrus Associates, The White House, 2 Meadrow, Godalming, GU7 3HN, Surrey, UK
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3
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Kazem NM, Abdulkareem AA, Milward MR. Salivary E-cadherin as a biomarker for diagnosis and predicting grade of periodontitis. J Periodontal Res 2023. [PMID: 37186464 DOI: 10.1111/jre.13125] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 03/14/2023] [Accepted: 03/28/2023] [Indexed: 05/17/2023]
Abstract
OBJECTIVES To determine the abilities of salivary E-cadherin to differentiate between periodontal health and periodontitis and to discriminate grades of periodontitis. BACKGROUND E-cadherin is the main protein responsible for maintaining the integrity of epithelial-barrier function. Disintegration of this protein is one of the events associated with the destructive forms of periodontal disease leading to increase concentration of E-cadherin in the oral biofluids. MATERIALS AND METHODS A total of 63 patients with periodontitis (case) and 35 periodontally healthy subjects (control) were included. For each patient, periodontal parameters including bleeding on probing (BOP), probing pocket depth (PPD), and clinical attachment level (CAL) were recorded. Concentration of salivary E-cadherin was determined by ELISA. Receiver operating characteristic (ROC) curve and area under the curve (AUC) were used to determine the diagnostic potentials of E-cadherin. RESULTS Level of salivary E-cadherin was significantly higher in periodontitis cases than controls. The ROC analysis showed that salivary E-cadherin exhibits excellent sensitivity and specificity (AUC 1.000) to differentiate periodontal health from periodontitis with a cutoff concentration equal to 1.325 ng/mL. The AUCs of E-cadherin to differentiate grade A from grade B and C periodontitis were 0.731 (cutoff point = 1.754 ng/mL) and 0.746 (cutoff point = 1.722 ng/mL), respectively. However, the AUC of salivary E-cadherin to differentiate grade B from grade C periodontitis was lower (0.541). Additionally, BOP and PPD were significantly and positively correlated with the concentration of salivary E-cadherin. CONCLUSION Salivary E-cadherin exhibited excellent sensitivity and specificity to differentiate periodontitis from a healthy periodontium. The level of accuracy of E-cadherin was also sufficient to recognize grade A periodontitis from grade B and C periodontitis.
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Affiliation(s)
- Nadia M Kazem
- Department of Periodontics, College of Dentistry, University of Baghdad, Baghdad, Iraq
| | - Ali A Abdulkareem
- Department of Periodontics, College of Dentistry, University of Baghdad, Baghdad, Iraq
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Young P, Russo I, Gill P, Muir J, Henry R, Davidson Z, Costa RJS. Reliability of pathophysiological markers reflective of exercise-induced gastrointestinal syndrome (EIGS) in response to 2-h high-intensity interval exercise: A comprehensive methodological efficacy exploration. Front Physiol 2023; 14:1063335. [PMID: 36895638 PMCID: PMC9989174 DOI: 10.3389/fphys.2023.1063335] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 02/06/2023] [Indexed: 02/25/2023] Open
Abstract
The study aimed to determine the test-retest reliability of exercise-induced gastrointestinal syndrome (EIGS) biomarkers, and assess the association of pre-exercise short chain fatty acid (SCFA) concentration with these biomarkers in response to prolonged strenuous exercise. Thirty-four participants completed 2 h of high-intensity interval training (HIIT) on two separate occasions with at least 5-days washout. Blood samples were collected pre- and post-exercise, and analysed for biomarkers associated with EIGS [i.e., cortisol, intestinal fatty-acid binding protein (I-FABP), sCD14, lipopolysaccharide binding protein (LBP), leukocyte counts, in-vitro neutrophil function, and systemic inflammatory cytokine profile]. Fecal samples were collected pre-exercise on both occasions. In plasma and fecal samples, bacterial DNA concentration was determined by fluorometer quantification, microbial taxonomy by 16S rRNA amplicon sequencing, and SCFA concentration by gas-chromatography. In response to exercise, 2 h of HIIT modestly perturbed biomarkers indicative of EIGS, including inducing bacteremia (i.e., quantity and diversity). Reliability analysis using comparative tests, Cohen's d, two-tailed correlation, and intraclass correlation coefficient (ICC) of resting biomarkers presented good-to-excellent for IL-1ra (r = 0.710, ICC = 0.92), IL-10 (r = 0.665, ICC = 0.73), cortisol (r = 0.870, ICC = 0.87), and LBP (r = 0.813, ICC = 0.76); moderate for total (r = 0.839, ICC = 0.44) and per cell (r = 0.749, ICC = 0.54) bacterially-stimulated elastase release, IL-1β (r = 0.625, ICC = 0.64), TNF-α (r = 0.523, ICC = 0.56), I-FABP (r = 0.411, ICC = 0.21), and sCD14 (r = 0.409, ICC = 0.38), plus fecal bacterial α-diversity; and poor for leukocyte (r = 0.327, ICC = 0.33) and neutrophil (r = 0.352, ICC = 0.32) counts. In addition, a medium negative correlation was observed between plasma butyrate and I-FABP (r = -0.390). The current data suggest a suite of biomarkers should be used to determine the incidence and severity of EIGS. Moreover, determination of plasma and/or fecal SCFA may provide some insight into the mechanistic aspects of EIGS instigation and magnitude in response to exercise.
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Affiliation(s)
- Pascale Young
- Department of Nutrition Dietetics and Food, Monash University, Notting Hill, VIC, Australia
| | - Isabella Russo
- Department of Nutrition Dietetics and Food, Monash University, Notting Hill, VIC, Australia
| | - Paul Gill
- Department of Gastroenterology, Monash University, Melbourne, VIC, Australia
| | - Jane Muir
- Department of Gastroenterology, Monash University, Melbourne, VIC, Australia
| | - Rebekah Henry
- Department of Civil Engineering, Monash University, Clayton, VIC, Australia
| | - Zoe Davidson
- Department of Nutrition Dietetics and Food, Monash University, Notting Hill, VIC, Australia
| | - Ricardo J S Costa
- Department of Nutrition Dietetics and Food, Monash University, Notting Hill, VIC, Australia
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Saheb Sharif-Askari F, Saheb Sharif-Askari N, Hafezi S, Goel S, Ali Hussain Alsayed H, Ansari AW, Mahboub B, Al-Muhsen S, Temsah MH, Hamid Q, Halwani R. Upregulation of interleukin-19 in saliva of patients with COVID-19. Sci Rep 2022; 12:16019. [PMID: 36163397 PMCID: PMC9511465 DOI: 10.1038/s41598-022-20087-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 09/08/2022] [Indexed: 11/21/2022] Open
Abstract
Cytokines are major players in orchestrating inflammation, disease pathogenesis and severity during COVID-19 disease. However, the role of IL-19 in COVID-19 pathogenesis remains elusive. Herein, through the analysis of transcriptomic datasets of SARS-CoV-2 infected lung cells, nasopharyngeal swabs, and lung autopsies of COVID-19 patients, we report that expression levels of IL-19 and its receptor, IL-20R2, were upregulated following SARS-CoV-2 infection. Of 202 adult COVID-19 patients, IL-19 protein level was significantly higher in blood and saliva of asymptomatic patients compared to healthy controls when adjusted for patients’ demographics (P < 0.001). Interestingly, high saliva IL-19 level was also associated with COVID-19 severity (P < 0.0001), need for mechanical ventilation (P = 0.002), and/or death (P = 0.010) within 29 days of admission, after adjusting for patients’ demographics, diabetes mellitus comorbidity, and COVID-19 serum markers of severity such as D-dimer, C-reactive protein, and ferritin. Moreover, patients who received interferon beta during their hospital stay had lower plasma IL-19 concentrations (24 pg mL−1) than those who received tocilizumab (39.2 pg mL−1) or corticosteroids (42.5 pg mL−1). Our findings indicate that high saliva IL-19 level was associated with COVID-19 infectivity and disease severity.
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Affiliation(s)
| | | | - Shirin Hafezi
- Sharjah Institute of Medical Research, University of Sharjah, Sharjah, United Arab Emirates
| | - Swati Goel
- Sharjah Institute of Medical Research, University of Sharjah, Sharjah, United Arab Emirates
| | | | - Abdul Wahid Ansari
- Dermatology Institute, Translational Research Institute, Hamad Medical Corporation, Doha, Qatar
| | - Bassam Mahboub
- Rashid Hospital, Dubai Health Authority, Dubai, United Arab Emirates
| | - Saleh Al-Muhsen
- Immunology Research Laboratory, Department of Pediatrics, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Mohamad-Hani Temsah
- Immunology Research Laboratory, Department of Pediatrics, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Qutayba Hamid
- Sharjah Institute of Medical Research, University of Sharjah, Sharjah, United Arab Emirates.,Department of Clinical Sciences, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates.,Meakins-Christie Laboratories, Research Institute of the McGill University Health Center, Montreal, QC, Canada
| | - Rabih Halwani
- Sharjah Institute of Medical Research, University of Sharjah, Sharjah, United Arab Emirates. .,Department of Clinical Sciences, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates. .,Prince Abdullah Ben Khaled Celiac Disease Chair, Department of Pediatrics, Faculty of Medicine, King Saud University, Riyadh, Saudi Arabia.
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Sharif-Askari FS, Sharif-Askari NS, Hafezi S, Mdkhana B, Alsayed HAH, Ansari AW, Mahboub B, Zakeri AM, Temsah MH, Zahir W, Hamid Q, Halwani R. Interleukin-17, a salivary biomarker for COVID-19 severity. PLoS One 2022; 17:e0274841. [PMID: 36136963 PMCID: PMC9498944 DOI: 10.1371/journal.pone.0274841] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 09/06/2022] [Indexed: 01/08/2023] Open
Abstract
Objectives T-helper 17 cell-mediated response and their effector IL-17 cytokine induced by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection is a major cause of COVID-19 disease severity and death. Therefore, the study aimed to determine if IL-17 level in saliva mirrors its circulatory level and hence can be used as a non-invasive biomarker for disease severity. Methods Interleukin-17 (IL-17) level was evaluated by ELISA in saliva and blood of 201 adult COVID-19 patients with different levels of severity. The IL-17 saliva level was also associated with COVID-19 disease severity, and need for mechanical ventilation and/or death within 29 days after admission of severe COVID-19 patients. Results We found that IL-17 level in saliva of COVID-19 patients reflected its circulatory level. High IL-17 level in saliva was associated with COVID-19 severity (P<0.001), need for mechanical ventilation (P = 0.002), and/or death by 29 days (P = 0.002), after adjusting for patients’ demographics, comorbidity, and COVID-19 serum severity markers such as D-Dimer, C-reactive protein, and ferritin. Conclusion We propose that saliva IL-17 level could be used as a biomarker to identify patients at risk of developing severe COVID-19.
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Affiliation(s)
| | | | - Shirin Hafezi
- Sharjah Institute of Medical Research, University of Sharjah, Sharjah, United Arab Emirates
| | - Bushra Mdkhana
- Sharjah Institute of Medical Research, University of Sharjah, Sharjah, United Arab Emirates
| | | | - Abdul Wahid Ansari
- Dermatology Institute, Translational Research Institute, Hamad Medical Corporation, Doha, Qatar
| | - Bassam Mahboub
- Rashid Hospital, Dubai Health Authority, Dubai, United Arab Emirates
| | - Adel M. Zakeri
- Department of Plant Production, Faculty of Agriculture and Food Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Mohamad-Hani Temsah
- Department of Pediatrics, Immunology Research Lab, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Walid Zahir
- G42 Health Care, Abu Dhabi, United Arab Emirates
- Institute of Public Health, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Qutayba Hamid
- Sharjah Institute of Medical Research, University of Sharjah, Sharjah, United Arab Emirates
- Department of Clinical Sciences, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates
- Meakins-Christie Laboratories, Research Institute of the McGill University Health Center, Montreal, Quebec, Canada
| | - Rabih Halwani
- Sharjah Institute of Medical Research, University of Sharjah, Sharjah, United Arab Emirates
- Department of Clinical Sciences, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates
- Prince Abdullah Ben Khaled Celiac Disease Chair, Department of Pediatrics, Faculty of Medicine, King Saud University, Riyadh, Saudi Arabia
- * E-mail:
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Assessment of Exercise-Associated Gastrointestinal Perturbations in Research and Practical Settings: Methodological Concerns and Recommendations for Best Practice. Int J Sport Nutr Exerc Metab 2022; 32:387-418. [PMID: 35963615 DOI: 10.1123/ijsnem.2022-0048] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 05/26/2022] [Accepted: 07/07/2022] [Indexed: 12/14/2022]
Abstract
Strenuous exercise is synonymous with disturbing gastrointestinal integrity and function, subsequently prompting systemic immune responses and exercise-associated gastrointestinal symptoms, a condition established as "exercise-induced gastrointestinal syndrome." When exercise stress and aligned exacerbation factors (i.e., extrinsic and intrinsic) are of substantial magnitude, these exercise-associated gastrointestinal perturbations can cause performance decrements and health implications of clinical significance. This potentially explains the exponential growth in exploratory, mechanistic, and interventional research in exercise gastroenterology to understand, accurately measure and interpret, and prevent or attenuate the performance debilitating and health consequences of exercise-induced gastrointestinal syndrome. Considering the recent advancement in exercise gastroenterology research, it has been highlighted that published literature in the area is consistently affected by substantial experimental limitations that may affect the accuracy of translating study outcomes into practical application/s and/or design of future research. This perspective methodological review attempts to highlight these concerns and provides guidance to improve the validity, reliability, and robustness of the next generation of exercise gastroenterology research. These methodological concerns include participant screening and description, exertional and exertional heat stress load, dietary control, hydration status, food and fluid provisions, circadian variation, biological sex differences, comprehensive assessment of established markers of exercise-induced gastrointestinal syndrome, validity of gastrointestinal symptoms assessment tool, and data reporting and presentation. Standardized experimental procedures are needed for the accurate interpretation of research findings, avoiding misinterpreted (e.g., pathological relevance of response magnitude) and overstated conclusions (e.g., clinical and practical relevance of intervention research outcomes), which will support more accurate translation into safe practice guidelines.
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Memon MA, Aleem B, Memon HA, Lee KY. Assessing salivary matrix metalloproteinase‐8 in prostate cancer patients undergoing androgen deprivation therapy. Clin Exp Dent Res 2022; 8:1277-1283. [PMID: 35769040 PMCID: PMC9562491 DOI: 10.1002/cre2.624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 06/20/2022] [Accepted: 06/21/2022] [Indexed: 11/10/2022] Open
Abstract
Introduction Matrix metalloproteinase‐8 (MMP‐8) is considered as one of the most promising diagnostic markers for periodontal disease. Androgen deprivation therapy (ADT) has been correlated with impaired collagen synthesis and an increase in periodontal tissue susceptibility to pathogenic microorganisms. Objective This study aims to investigate the impact of ADT on salivary MMP‐8 level and periodontal parameters, which might be useful in monitoring periodontal disease in prostate cancer patients undergoing ADT. Materials and Methods A total of 88 subjects were selected and were divided into two groups: Group I included n = 78 PC patients who have been undergoing ADT); Group II included n = 10 healthy individuals. Periodontal parameters such as plaque index (PI), gingival index (GI), periodontal probing depth (PPD), and clinical attachment level (CAL) were examined. The salivary MMP‐8 level was estimated by using the sandwich enzyme‐linked immunosorbent assay method. Results Significant differences in mean salivary MMP‐8 level were found between PC patients undergoing ADT and healthy individuals. Salivary MMP‐8 levels of all individuals were positively correlated with GI, PI, PPD, and CAL. Salivary MMP‐8 can distinguish between periodontitis and healthy individuals with an accuracy of about 80%. Conclusion Salivary MMP‐8 levels were found to be higher in prostate cancer patients undergoing ADT compared to healthy individuals.
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Affiliation(s)
- Maaz A. Memon
- Institute of Pathology and Diagnostic Medicine Khyber Medical University Peshawar Pakistan
| | - Benish Aleem
- Institute of Pathology and Diagnostic Medicine Khyber Medical University Peshawar Pakistan
| | | | - Ka Y. Lee
- Department of Health Sciences, Swedish Winter Sports Research Centre Mid Sweden University Östersund Sweden
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Okano S, Nishizawa H, Yui J, Nakamura A. Impact of body fat, body water content, and skeletal muscle mass index on peak salivary lactate levels after squat jump exercise in healthy non-athlete adult males. BMC Sports Sci Med Rehabil 2022; 14:91. [PMID: 35596205 PMCID: PMC9121538 DOI: 10.1186/s13102-022-00482-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 05/09/2022] [Indexed: 12/03/2022]
Abstract
BACKGROUND In the rehabilitation and sports science fields, comprehensive assessment of the response to exercise is important for accurately prescribing exercise programs. Lactate is an important energy substrate that is frequently measured in clinical practice because it provides information on aerobic capacity. Salivary lactate, which can be measured non-invasively, has recently been focused on as an alternative to blood lactate. This study aimed to determine the combined effects of body fat, body water content, and skeletal muscle mass index on peak salivary lactate levels. METHODS Thirty-seven non-athletic males performed a squat jump exercise. Their salivary lactate levels were measured before, immediately after, and every 5 min after the exercise using a simplified device. We also assessed body composition. A linear multiple regression analysis was performed with peak salivary lactate levels as the dependent variable and body fat ratio, body water content, and the skeletal muscle mass index as independent variables. RESULTS The participants' body fat ratio (positive effect; p = 0.001) and body water content (negative effect; p = 0.035) significantly affected peak salivary lactate levels. Skeletal muscle mass index tended to positively influence salivary lactate levels (p = 0.099), albeit not significantly. The adjusted R-squared value of the model was 0.312 (p = 0.001). CONCLUSIONS The combined effect of body fat, body water content, and skeletal muscle mass index on peak salivary lactate levels was 31.2%. Better nutritional guidance may be effective in promoting weight loss and increasing body water content to improve aerobic capacity in the rehabilitation setting.
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Affiliation(s)
- Satomi Okano
- Department of Physical Therapy, Faculty of Health Sciences, Iryo Sosei University, 5-5-1 Chuodai Iino, Iwaki, Fukushima, 970-8551, Japan
| | - Hitomi Nishizawa
- School of Health Sciences, Faculty of Medicine, Shinshu University, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
| | - Joya Yui
- Graduate School of Medicine, Shinshu University, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
| | - Akinori Nakamura
- Department of Neurology, Department of Clinical Research, National Hospital Organization Matsumoto Medical Center, 2-20-30 Muraimachi-minami, Matsumoto, Nagano, 399-8701, Japan.
- Third Department of Medicine, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano, 390-0802, Japan.
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[Effects of acid stimulation on saliva flow rate and compositions of human parotid and submandibular glands]. BEIJING DA XUE XUE BAO. YI XUE BAN = JOURNAL OF PEKING UNIVERSITY. HEALTH SCIENCES 2022. [PMID: 35165473 PMCID: PMC8860659 DOI: 10.19723/j.issn.1671-167x.2022.01.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
OBJECTIVE To investigate the effect of acid stimulation on salivary flow rate and compositions of human parotid and submandibular glands, so as to provide basis for comprehensive evaluation of salivary gland function in both health and disease status. METHODS In the study, 210 healthy participants' whole saliva samples were collected under passive drooling, and their parotid gland and submandibular gland secretions were collected by negative pressure suction. 2% citric acid was dropped on the tip of tongue every 1 min for acid stimulation for a total of 5 times to collect stimulated whole saliva, parotid and submandibular gland saliva. The collected saliva was weighed and saliva flow rate was calculated. The K+, Na+, Cl-, Ca2+, total protein, total phosphorus and α-amylase in saliva samples were detected by biochemical analyzer, and the changing features of flow rate and compositions of different kinds of saliva were compared and analyzed. RESULTS After acid stimulation, saliva flow rate significantly increased. The increase proportion of parotid gland saliva (10.7 folds) was much higher than that of submandibular gland saliva (2.9 folds). The concentrations of Na+, Cl-, Ca2+, total protein and α-amylase in parotid gland saliva increased significantly (P < 0.05), but there was no significant difference in total phosphorus and K+ (P=0.89, P=0.34). The concentration of Na+ and Ca2+ in saliva of submandibular gland increased significantly(P < 0.05), the concentration of total phosphorus decreased significantly(P < 0.05), and the concentration of Cl- increased, but the difference was not significant(P=0.068). There was no significant difference in total protein, K+ and α-amylase (P=0.85, P=0.07, P=0.95). The compound secretion rate of total phosphorus in saliva of submandibular gland remained unchanged(P=0.066), while the secretion rate of K+, Na+, Cl-, Ca2+, total protein and α-amylase significantly increased(P < 0.01). The compound secretion rate of K+, Na+, Cl-, Ca2+, total protein and total phosphorus and α-amylase in parotid gland saliva increased(P < 0.01). The concentrations of Na+, Cl-, K+, total phosphorus, total protein and α-amylase in parotid were higher than those in submandibular gland (P < 0.01), and the concentration of Ca2+ in submandibular gland saliva was significantly higher than that in parotid (P < 0.001). CONCLUSION The response of parotid to acid stimulation is stronger, and the secretion of submandibular gland is more stable. Acid stimulation significantly influences the concentrations of electrolytes in saliva, and the composited secretion rate is an evaluation index to reflect both flow rate and composition concentration of saliva. The parotid gland plays an important role in the secretion of total protein, total phosphorus and α-amylase in saliva, and the submandibular gland is the main source of Ca2+ in saliva.
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Do MT, Vu H, Lee JK, Park SM, Son JS, Kim HD. Salivary flow rate and the risk of cognitive impairment among Korean elders: a cross-sectional study. BMC Geriatr 2021; 21:245. [PMID: 33853530 PMCID: PMC8045327 DOI: 10.1186/s12877-021-02200-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 04/06/2021] [Indexed: 11/17/2022] Open
Abstract
Background Salivary function has been suggested to be associated with cognitive impairment. However, the effect of salivary flow rate (SFR) on cognitive impairment remains unclear. This study aimed to investigate whether SFR is associated with cognitive impairment among Korean elders. Methods This cross-sectional study included 649 elders aged 65 and older in the Korean community-dwelling population. Cognitive impairment was assessed using the Mini-Mental Status Examination. Unstimulated SFR was measured and dichotomized. Denture status, age, sex, education level, smoking, drinking, diabetes, hypertension, and obesity were considered confounders. Multivariable logistic regression analysis was applied to assess the adjusted association. Stratified analysis by sex and denture status was performed to clarify the effect modification. Results Participants without cognitive impairment showed a higher SFR level than those with cognitive impairment (0.81 mL/min for non-cognitive impairment versus 0.52 mL/min for cognitive impairment, p < 0.001). After controlling for confounders, participants with low SFR (< 0.3 mL/min) were more likely to have cognitive impairment by 1.5 times than participants with normal SFR (odds ratio [OR] = 1.5, confidence interval [CI] = 1.05–2.10). The association of low SFR with cognitive impairment was higher in women and dentate participants: about 10% higher in women (OR = 1.63, CI = 1.07–2.50) and about 22% higher in dentate participants (OR = 1.82, CI = 1.41–2.90). Conclusions Salivary flow rate is independently associated with cognitive impairment among Korean elders. The association was modified in females and dentate elders. Physicians and dentists should consider low SFR and cognitive impairment as a risk factor between them in clinics. Supplementary Information The online version contains supplementary material available at 10.1186/s12877-021-02200-2.
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Affiliation(s)
- Minh-Tung Do
- Department of Urology, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Huong Vu
- Department of Preventive and Social Dentistry, School of Dentistry, Seoul National University Seoul, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
| | - Jong-Koo Lee
- Department of Family Medicine, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Sang-Min Park
- Department of Family Medicine, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Joung-Sik Son
- Department of Family Medicine, Korea University Guro Hospital, 148 Gurodong-ro, Guro-gu, Seoul, 08308, South Korea
| | - Hyun-Duck Kim
- Department of Preventive and Social Dentistry, School of Dentistry, Seoul National University Seoul, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea. .,Dental Research Institute, Seoul National University, Seoul, 03080, Republic of Korea.
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Okano S, Nishizawa H, Yui J, Yokokawa Y, Koinuma M, Nakamura A. Convergent validity of a simplified device and relationship between blood lactate and salivary lactate after a vertical squat jump in healthy non-athletes. J Phys Ther Sci 2021; 33:187-193. [PMID: 33814702 PMCID: PMC8012186 DOI: 10.1589/jpts.33.187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 12/01/2020] [Indexed: 11/28/2022] Open
Abstract
[Purpose] The aims of this study were 1) to examine the convergent validity between
Lactate pro 2 and a standard JCA-BM 8000 automatic analyzer using salivary lactate and 2)
to investigate the relationship between blood and salivary lactate levels after a vertical
squat jump. [Participants and Methods] Healthy non-athletes participated in this
observational study. The participants performed a vertical squat jump for 1 min 30 s.
Blood and salivary lactate levels were measured before and after exercise using Lactate
Pro 2. [Results] The intraclass correlation coefficient between Lactate Pro 2 and the
JCA-BM 8000 automatic analyzer was 0.773, which can be considered as substantial
convergent validity. However, in some samples, the salivary lactate level was out of the
measurable range, and numerical values could not be obtained. The cross-correlation
function between the blood and salivary lactate levels was 0.535 at lag 0 and 0.750 at lag
1, which indicated a 5-min lag between the salivary and blood lactate values. [Conclusion]
Salivary lactate levels can be easily measured using Lactate Pro 2, although its
sensitivity needs to be resolved. Further research is required for salivary lactate level,
which can be collected non-invasively, to be used as an alternative parameter to blood
lactate level.
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Affiliation(s)
- Satomi Okano
- Graduate School of Medicine, Shinshu University, Japan.,Department of Physical Therapy, Faculty of Health Sciences, Iryo Sosei University, Japan
| | - Hitomi Nishizawa
- School of Health Sciences, Faculty of Medicine, Shinshu University, Japan
| | - Joya Yui
- Graduate School of Medicine, Shinshu University, Japan
| | | | - Yoshiharu Yokokawa
- School of Health Sciences, Faculty of Medicine, Shinshu University, Japan
| | - Masayoshi Koinuma
- Center of Clinical Research, Shinshu University Hospital, Japan.,Faculty of Pharmaceutical Sciences, Teikyo Heisei University, Japan
| | - Akinori Nakamura
- Third Department of Medicine, Shinshu University School of Medicine: 3-1-1 Asahi, Matsumoto, Nagano 390-0802, Japan.,Department of Clinical Research, National Hospital Organization Matsumoto Medical Center, Japan
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Diep MT, Jensen JL, Skudutyte-Rysstad R, Young A, Sødal ATT, Petrovski BÉ, Hove LH. Xerostomia and hyposalivation among a 65-yr-old population living in Oslo, Norway. Eur J Oral Sci 2021; 129:e12757. [PMID: 33501713 PMCID: PMC7986810 DOI: 10.1111/eos.12757] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 11/11/2020] [Accepted: 11/20/2020] [Indexed: 12/11/2022]
Abstract
This study aimed to describe the prevalence and associated factors for xerostomia and hyposalivation in a young‐elderly population. A random sample of 460 65‐yr‐old people living in Oslo, Norway, answered a questionnaire and underwent a clinical examination (237 men and 223 women; response rate 58%). Ten percent of respondents reported xerostomia. The median Summated Xerostomia Index was 6 (interquartile range [IQR]: 5–7) and the median Clinical Oral Dryness Score was 2 (IQR: 1–3). The median unstimulated whole saliva (UWS) secretion rate was 0.34 (IQR: 0.20–0.53) mL min–1 and the median stimulated whole saliva (SWS) secretion rate was 1.74 (IQR: 1.24–2.38) mL min–1. In 8% of the study participants the UWS secretion rate was ≤0.1 mL min–1 and in 4% the SWS secretion rate was ≤0.7 mL min–1. Three percent of the study participants had both xerostomia and hyposalivation with respect to UWS. Xerostomia was significantly associated with medication use, having rheumatic disease, and having received radiation therapy to the head/neck region. Hyposalivation with respect to UWS and SWS was significantly associated with medication use and type II diabetes. Even though xerostomia and hyposalivation were not prevalent conditions in this population, clinicians should be especially aware of the salivary conditions in patients taking four or more medications, patients diagnosed with type II diabetes, and those who have undergone radiation therapy to the head/neck region.
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Affiliation(s)
- My Tien Diep
- Department of Cariology and Gerodontology, Faculty of Dentistry, University of Oslo, Oslo, Norway
| | - Janicke Liaaen Jensen
- Department of Oral Surgery and Oral Medicine, Faculty of Dentistry, University of Oslo, Oslo, Norway
| | - Rasa Skudutyte-Rysstad
- Department of Cariology and Gerodontology, Faculty of Dentistry, University of Oslo, Oslo, Norway
| | - Alix Young
- Department of Cariology and Gerodontology, Faculty of Dentistry, University of Oslo, Oslo, Norway
| | - Anne Thea Tveit Sødal
- Department of Cariology and Gerodontology, Faculty of Dentistry, University of Oslo, Oslo, Norway
| | | | - Lene Hystad Hove
- Department of Cariology and Gerodontology, Faculty of Dentistry, University of Oslo, Oslo, Norway
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Test-Retest Reliability of a Modified Visual Analog Scale Assessment Tool for Determining Incidence and Severity of Gastrointestinal Symptoms in Response to Exercise Stress. Int J Sport Nutr Exerc Metab 2019; 29:411–419. [PMID: 30632417 DOI: 10.1123/ijsnem.2018-0215] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Considering the recent growth of exercise gastroenterology research focusing on exercise-induced gastrointestinal syndrome mechanisms, response magnitude, prevention and management strategies, the standardized assessment of gastrointestinal symptoms (GIS) is warranted. The current methodological study aimed to test the reliability of a modified visual analog scale for assessing GIS during exercise, in response to a variety of exertional-stress scenarios, with and without dietary intervention. Recreational endurance runners (n = 31) performed one of the three exercise protocols, which included: 2-hr running at 70% V˙O2max in temperate (24.7 °C) ambient conditions, with fluid restriction; 2-hr running at 60% V˙O2max in hot (35.1 °C) ambient conditions, while consuming chilled water immediately before and every 15 min during exercise; and 2-hr running at 60% V˙O2max in temperate (23.0 °C) ambient conditions, while consuming 30 g/20 min carbohydrate (2∶1 glucose∶fructose, 10% temperate w/v), followed by a 1-hr distance test. GIS was monitored pre-exercise, periodically during exercise, and immediately postexercise. After wash out, participants were retested in mirrored conditions. No significant differences (p > .05) were identified between test-retest using Wilcoxon signed-rank test for all GIS (specific and categorized), within each exercise protocol and the combined protocols. Strong correlations were observed for gut discomfort, total GIS, upper GIS, and nausea (rs = .566 to rs = .686; p < .001), but not for lower GIS (rs = .204; p = .232). Cohen's magnitude of difference was minimal for all GIS (specific δ < 0.14 and categorized δ < 0.08). The modified visual analog scale for assessing GIS during exercise appears to be a reliable tool for identifying incidence and severity of GIS in cohort populations and is sensitive enough to detect exertional and intervention differences.
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