Diana Gabriela Soares1, Fernanda Gonçalves Basso2, Josimeri Hebling3, Carlos Alberto de Souza Costa4. 1. Department of Dental Materials and Prosthodontics, Univ. Estadual Paulista - UNESP, Araraquara School of Dentistry, Araraquara, SP, Brazil. 2. Department of Physiology and Pathology, Univ. Estadual Paulista - UNESP, Araraquara School of Dentistry, Araraquara, SP, Brazil. 3. Department of Orthodontics and Pediatric Dentistry, Univ. Estadual Paulista - UNESP, Araraquara School of Dentistry, Araraquara, SP, Brazil. 4. Department of Physiology and Pathology, Univ. Estadual Paulista - UNESP, Araraquara School of Dentistry, Araraquara, SP, Brazil. Electronic address: casouzac@foar.unesp.br.
Abstract
OBJECTIVES: To evaluate the effect of the oxidative stress on human dental pulp cells (HDPCs) promoted by toxic concentrations of hydrogen peroxide (H2O2) on its odontoblastic differentiation capability through time. METHODS: HDPCs were exposed to two different concentrations of H2O2 (0.1 and 0.3μg/ml) for 30min. Thereafter, cell viability (MTT assay) and oxidative stress generation (H2DCFDA fluorescence assay) were immediately evaluated. Data were compared with those for alkaline phosphatase (ALP) activity (thymolphthalein assay) and mineralized nodule deposition (alizarin red) by HDPCs cultured for 7 days in osteogenic medium. RESULTS: A significant reduction in cell viability and oxidative stress generation occurred in the H2O2-treated cells when compared with negative controls (no treatment), in a concentration-dependent fashion. Seven days after H2O2 treatment, the cells showed significant reduction in ALP activity compared with negative control and no mineralized nodule deposition. CONCLUSION: Both concentrations of H2O2 were toxic to the cells, causing intense cellular oxidative stress, which interfered with the odontogenic differentiation capability of the HDPCs. CLINICAL SIGNIFICANCE: The intense oxidative stress on HDPCs mediated by H2O2 at toxic concentrations promotes intense reduction on odontoblastic differentiation capability in a 7-day evaluation period, which may alter the initial pulp healing capability in the in vivo situation.
OBJECTIVES: To evaluate the effect of the oxidative stress on human dental pulp cells (HDPCs) promoted by toxic concentrations of hydrogen peroxide (H2O2) on its odontoblastic differentiation capability through time. METHODS: HDPCs were exposed to two different concentrations of H2O2 (0.1 and 0.3μg/ml) for 30min. Thereafter, cell viability (MTT assay) and oxidative stress generation (H2DCFDA fluorescence assay) were immediately evaluated. Data were compared with those for alkaline phosphatase (ALP) activity (thymolphthalein assay) and mineralized nodule deposition (alizarin red) by HDPCs cultured for 7 days in osteogenic medium. RESULTS: A significant reduction in cell viability and oxidative stress generation occurred in the H2O2-treated cells when compared with negative controls (no treatment), in a concentration-dependent fashion. Seven days after H2O2 treatment, the cells showed significant reduction in ALP activity compared with negative control and no mineralized nodule deposition. CONCLUSION: Both concentrations of H2O2 were toxic to the cells, causing intense cellular oxidative stress, which interfered with the odontogenic differentiation capability of the HDPCs. CLINICAL SIGNIFICANCE: The intense oxidative stress on HDPCs mediated by H2O2 at toxic concentrations promotes intense reduction on odontoblastic differentiation capability in a 7-day evaluation period, which may alter the initial pulp healing capability in the in vivo situation.
Authors: Lingli Li; Di Feng; Zaiming Luo; William J Welch; Christopher S Wilcox; En Yin Lai Journal: Hypertension Date: 2015-06-22 Impact factor: 10.190
Authors: Uxua Ortecho-Zuta; Carla Caroline de Oliveira Duque; Rafael Antonio de Oliveira Ribeiro; Maria Luísa Leite; Diana Gabriela Soares; Josimeri Hebling; André Luiz Fraga Briso; Carlos Alberto de Souza Costa Journal: Clin Oral Investig Date: 2022-02-23 Impact factor: 3.573
Authors: Rafael Antonio de Oliveira Ribeiro; Uxua Ortecho Zuta; Igor Paulino Mendes Soares; Caroline Anselmi; Diana Gabriela Soares; André Luiz Fraga Briso; Josimeri Hebling; Carlos Alberto de Souza Costa Journal: Clin Oral Investig Date: 2022-08-16 Impact factor: 3.606