Hyperglycemia and xerostomia are key determinants of tooth decay in type 1 diabetic mice

Insulin-dependent type 1 diabetes mellitus (DM) and oral diseases are closely interrelated. Poor metabolic control in diabetics is associated with a high risk of gingivitis, periodontitis and tooth loss. Salivary flow declines in diabetics and patients suffer from xerostomia. Reduced saliva predispo...

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Veröffentlicht in:Laboratory investigation 2012-06, Vol.92 (6), p.868-882
Hauptverfasser: Yeh, Chih-Ko, Harris, Stephen E, Mohan, Sumathy, Horn, Diane, Fajardo, Roberto, Chun, Yong-Hee Patricia, Jorgensen, James, MacDougall, Mary, Abboud-Werner, Sherry
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container_issue 6
container_start_page 868
container_title Laboratory investigation
container_volume 92
creator Yeh, Chih-Ko
Harris, Stephen E
Mohan, Sumathy
Horn, Diane
Fajardo, Roberto
Chun, Yong-Hee Patricia
Jorgensen, James
MacDougall, Mary
Abboud-Werner, Sherry
description Insulin-dependent type 1 diabetes mellitus (DM) and oral diseases are closely interrelated. Poor metabolic control in diabetics is associated with a high risk of gingivitis, periodontitis and tooth loss. Salivary flow declines in diabetics and patients suffer from xerostomia. Reduced saliva predisposes to enamel hypomineralization and caries formation; however, the mechanisms that initiate and lead to progression of tooth decay and periodontitis in type 1 DM have not been explored. To address this issue, we analyzed tooth morphology in Akita −/− mice that harbor a point mutation in the Ins2 insulin gene, which leads to progressive hyperglycemia. Mandibles from Akita −/− and wild-type littermates were analyzed by microCT, scanning EM and histology; teeth were examined for amelogenin (Amel) and ameloblastin (Ambn) expression. Mice were injected with pilocarpine to assess saliva production. As hyperglycemia may alter pulp repair, the effect of high glucose levels on the proliferation/differentiation of cultured MD10-F2 pulp cells was also analyzed. Results showed that Akita −/− mice at 6 weeks of age showed chalky white incisors that correlated with marked hyperglycemia and impaired saliva production. MicroCT of Akita −/− teeth revealed excessive enamel wearing and hypomineralization; immunostaining for Amel and Ambn was decreased. A striking feature was invasion of dentinal tubules with Streptococcus mitis and microabcesses that originated in the coronal pulp and progressed to pulp necrosis and periapical periodontitis. High levels of glucose also inhibited MD10-F2 cell proliferation and differentiation. Our findings provide the first evidence that hyperglycemia in combination with reduced saliva in a model of type1 DM leads to decreased enamel mineralization/matrix proteins and predisposes to excessive wearing and decay. Importantly, hyperglycemia adversely affects enamel matrix proteins and pulp repair. Early detection and treatment of hyperglycemia and hyposalivation may provide a useful strategy for preventing the dental complications of diabetes and promoting oral health in this population.
doi_str_mv 10.1038/labinvest.2012.60
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Poor metabolic control in diabetics is associated with a high risk of gingivitis, periodontitis and tooth loss. Salivary flow declines in diabetics and patients suffer from xerostomia. Reduced saliva predisposes to enamel hypomineralization and caries formation; however, the mechanisms that initiate and lead to progression of tooth decay and periodontitis in type 1 DM have not been explored. To address this issue, we analyzed tooth morphology in Akita −/− mice that harbor a point mutation in the Ins2 insulin gene, which leads to progressive hyperglycemia. Mandibles from Akita −/− and wild-type littermates were analyzed by microCT, scanning EM and histology; teeth were examined for amelogenin (Amel) and ameloblastin (Ambn) expression. Mice were injected with pilocarpine to assess saliva production. As hyperglycemia may alter pulp repair, the effect of high glucose levels on the proliferation/differentiation of cultured MD10-F2 pulp cells was also analyzed. Results showed that Akita −/− mice at 6 weeks of age showed chalky white incisors that correlated with marked hyperglycemia and impaired saliva production. MicroCT of Akita −/− teeth revealed excessive enamel wearing and hypomineralization; immunostaining for Amel and Ambn was decreased. A striking feature was invasion of dentinal tubules with Streptococcus mitis and microabcesses that originated in the coronal pulp and progressed to pulp necrosis and periapical periodontitis. High levels of glucose also inhibited MD10-F2 cell proliferation and differentiation. Our findings provide the first evidence that hyperglycemia in combination with reduced saliva in a model of type1 DM leads to decreased enamel mineralization/matrix proteins and predisposes to excessive wearing and decay. Importantly, hyperglycemia adversely affects enamel matrix proteins and pulp repair. 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Psychology ; hyperglycemia ; Hyperglycemia - diagnosis ; Hyperglycemia - etiology ; Investigative techniques, diagnostic techniques (general aspects) ; Laboratory Medicine ; Male ; Mandible - diagnostic imaging ; Mandible - pathology ; Mandible - ultrastructure ; Medical sciences ; Medicine ; Medicine &amp; Public Health ; Mice ; Mice, Inbred C57BL ; Mice, Knockout ; Pathology ; Pilocarpine - pharmacology ; pulpitis ; Radiography ; research-article ; saliva ; Saliva - metabolism ; Salivation - drug effects ; Streptococcus mitis ; Tooth - metabolism ; Tooth - pathology ; Xerostomia - diagnosis ; Xerostomia - etiology</subject><ispartof>Laboratory investigation, 2012-06, Vol.92 (6), p.868-882</ispartof><rights>2012 United States &amp; Canadian Academy of Pathology</rights><rights>United States and Canadian Academy of Pathology, Inc. 2012</rights><rights>2015 INIST-CNRS</rights><rights>Copyright Nature Publishing Group Jun 2012</rights><rights>2012 USCAP, Inc All rights reserved 2012</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c651t-49a7aa68100ab7e5ccf369f853611cd2bdc3e6bd6c117e5369e9505a2dce78c33</citedby><cites>FETCH-LOGICAL-c651t-49a7aa68100ab7e5ccf369f853611cd2bdc3e6bd6c117e5369e9505a2dce78c33</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885,27924,27925</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&amp;idt=26049595$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/22449801$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Yeh, Chih-Ko</creatorcontrib><creatorcontrib>Harris, Stephen E</creatorcontrib><creatorcontrib>Mohan, Sumathy</creatorcontrib><creatorcontrib>Horn, Diane</creatorcontrib><creatorcontrib>Fajardo, Roberto</creatorcontrib><creatorcontrib>Chun, Yong-Hee Patricia</creatorcontrib><creatorcontrib>Jorgensen, James</creatorcontrib><creatorcontrib>MacDougall, Mary</creatorcontrib><creatorcontrib>Abboud-Werner, Sherry</creatorcontrib><title>Hyperglycemia and xerostomia are key determinants of tooth decay in type 1 diabetic mice</title><title>Laboratory investigation</title><addtitle>Lab Invest</addtitle><addtitle>Lab Invest</addtitle><description>Insulin-dependent type 1 diabetes mellitus (DM) and oral diseases are closely interrelated. Poor metabolic control in diabetics is associated with a high risk of gingivitis, periodontitis and tooth loss. Salivary flow declines in diabetics and patients suffer from xerostomia. Reduced saliva predisposes to enamel hypomineralization and caries formation; however, the mechanisms that initiate and lead to progression of tooth decay and periodontitis in type 1 DM have not been explored. To address this issue, we analyzed tooth morphology in Akita −/− mice that harbor a point mutation in the Ins2 insulin gene, which leads to progressive hyperglycemia. Mandibles from Akita −/− and wild-type littermates were analyzed by microCT, scanning EM and histology; teeth were examined for amelogenin (Amel) and ameloblastin (Ambn) expression. Mice were injected with pilocarpine to assess saliva production. As hyperglycemia may alter pulp repair, the effect of high glucose levels on the proliferation/differentiation of cultured MD10-F2 pulp cells was also analyzed. 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Results showed that Akita −/− mice at 6 weeks of age showed chalky white incisors that correlated with marked hyperglycemia and impaired saliva production. MicroCT of Akita −/− teeth revealed excessive enamel wearing and hypomineralization; immunostaining for Amel and Ambn was decreased. A striking feature was invasion of dentinal tubules with Streptococcus mitis and microabcesses that originated in the coronal pulp and progressed to pulp necrosis and periapical periodontitis. High levels of glucose also inhibited MD10-F2 cell proliferation and differentiation. Our findings provide the first evidence that hyperglycemia in combination with reduced saliva in a model of type1 DM leads to decreased enamel mineralization/matrix proteins and predisposes to excessive wearing and decay. Importantly, hyperglycemia adversely affects enamel matrix proteins and pulp repair. Early detection and treatment of hyperglycemia and hyposalivation may provide a useful strategy for preventing the dental complications of diabetes and promoting oral health in this population.</abstract><cop>New York</cop><pub>Elsevier Inc</pub><pmid>22449801</pmid><doi>10.1038/labinvest.2012.60</doi><tpages>15</tpages><oa>free_for_read</oa></addata></record>
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language eng
recordid cdi_pubmedcentral_primary_oai_pubmedcentral_nih_gov_4513945
source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection
subjects 692/699
692/699/2743/137/1418
Amelogenin - metabolism
Animals
Biological and medical sciences
Biotechnology
Dental Caries - diagnosis
Dental Caries - etiology
Dental Enamel Proteins - metabolism
diabetes
Diabetes Mellitus, Type 1 - complications
Diabetes Mellitus, Type 1 - diagnosis
Diabetes. Impaired glucose tolerance
enamel
Endocrine pancreas. Apud cells (diseases)
Endocrinopathies
Etiopathogenesis. Screening. Investigations. Target tissue resistance
Female
Fundamental and applied biological sciences. Psychology
hyperglycemia
Hyperglycemia - diagnosis
Hyperglycemia - etiology
Investigative techniques, diagnostic techniques (general aspects)
Laboratory Medicine
Male
Mandible - diagnostic imaging
Mandible - pathology
Mandible - ultrastructure
Medical sciences
Medicine
Medicine & Public Health
Mice
Mice, Inbred C57BL
Mice, Knockout
Pathology
Pilocarpine - pharmacology
pulpitis
Radiography
research-article
saliva
Saliva - metabolism
Salivation - drug effects
Streptococcus mitis
Tooth - metabolism
Tooth - pathology
Xerostomia - diagnosis
Xerostomia - etiology
title Hyperglycemia and xerostomia are key determinants of tooth decay in type 1 diabetic mice
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