1
|
Lee YH, Kim HS, Kim JS, Yu MK, Cho SD, Jeon JG, Yi HK. C-myb Regulates Autophagy for Pulp Vitality in Glucose Oxidative Stress. J Dent Res 2015; 95:430-8. [PMID: 26661713 DOI: 10.1177/0022034515622139] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Diabetes mellitus is closely related to oral-complicated diseases by oxidative stress. This study investigates whether cellular myeloblastosis (c-myb) could protect human dental pulp cells against glucose oxidative stress and regulate autophagy activity for pulp vitality. Diabetes mellitus was induced by streptozotocin in Sprague-Dawley rats, and their pulp tissue in teeth was analyzed in terms of pulp cavity and molecules by hematoxylin and eosin and immunohistochemistry staining. Human dental pulp cells were serially subcultured and treated with glucose oxidase in the presence of elevated glucose to generate glucose oxidative stress. The replication-deficient adenovirus c-myb and small interfering RNA c-myb were introduced for c-myb expression. The pulp tissue from the diabetic rats was structurally different from normal tissue in terms of narrow pulp capacity, reduced c-myb, and dentinogenesis molecules. Glucose oxidase treatment decreased c-myb and dentinogenesis molecules (bone morphogenetic protein 2 and 7, dentin matrix protein 1, and dentin sialophosphoprotein) in human dental pulp cells. However, overexpression of c-myb by adenovirus c-myb increased dentinogenesis, autophagy molecules (autophagy protein 5, microtubule-associated protein 1A/1B-light chain 3, and Beclin-1), and cell survival via p-AMPK/AKT signaling even with glucose oxidative stress. In contrast, the lack of c-myb decreased the above molecules and cell survival by downregulating p-AMPK/AKT signaling. The results indicate that diabetes leads to irreversible damage to dental pulp, which is related to downexpression of autophagy via the p-AMPK/AKT pathway by decline of c-myb. The findings of this study provide a new insight that c-myb could ameliorate autophagy activity and that it is applicable for monitoring complicated diseases of dental pulp. The involvement of c-myb in pulp pathology could serve a therapeutic target in oral-complicated diseases.
Collapse
Affiliation(s)
- Y H Lee
- Department of Oral Biochemistry, Institute of Oral Bioscience, School of Dentistry, Chonbuk National University, Jeonju, Korea
| | - H S Kim
- Department of Conservative Dentistry, Institute of Oral Bioscience, School of Dentistry, Chonbuk National University, Jeonju, Korea
| | - J S Kim
- Department of Oral Biochemistry, Institute of Oral Bioscience, School of Dentistry, Chonbuk National University, Jeonju, Korea
| | - M K Yu
- Department of Conservative Dentistry, Institute of Oral Bioscience, School of Dentistry, Chonbuk National University, Jeonju, Korea
| | - S D Cho
- Department of Oral Pathology, Institute of Oral Bioscience, School of Dentistry, Chonbuk National University, Jeonju, Korea
| | - J G Jeon
- Department of Preventive Dentistry, Institute of Oral Bioscience, School of Dentistry, Chonbuk National University, Jeonju, Korea
| | - H K Yi
- Department of Oral Biochemistry, Institute of Oral Bioscience, School of Dentistry, Chonbuk National University, Jeonju, Korea
| |
Collapse
|
2
|
Simón-Soro A, Mira A. Solving the etiology of dental caries. Trends Microbiol 2014; 23:76-82. [PMID: 25435135 DOI: 10.1016/j.tim.2014.10.010] [Citation(s) in RCA: 268] [Impact Index Per Article: 26.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 10/28/2014] [Accepted: 10/30/2014] [Indexed: 01/22/2023]
Abstract
For decades, the sugar-fermenting, acidogenic species Streptococcus mutans has been considered the main causative agent of dental caries and most diagnostic and therapeutic strategies have been targeted toward this microorganism. However, recent DNA- and RNA-based studies from carious lesions have uncovered an extraordinarily diverse ecosystem where S. mutans accounts only a tiny fraction of the bacterial community. This supports the concept that consortia formed by multiple microorganisms act collectively, probably synergistically, to initiate and expand the cavity. Thus, antimicrobial therapies are not expected to be effective in the treatment of caries and other polymicrobial diseases that do not follow classical Koch's postulates.
Collapse
Affiliation(s)
- Aurea Simón-Soro
- FISABIO Foundation, Center for Advanced Research in Public Health, Avda Cataluña 21, 46020 Valencia, Spain
| | - Alex Mira
- FISABIO Foundation, Center for Advanced Research in Public Health, Avda Cataluña 21, 46020 Valencia, Spain.
| |
Collapse
|
3
|
Affiliation(s)
- M Larmas
- Institute of Dentistry, University of Oulu, and University Hospital of Oulu, Yliopisto PO Box 5281, FIN-90014 University of Oulu, Finland.
| |
Collapse
|