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Authors = Cássio Luiz Coutinho Almeida-da-Silva ORCID = 0000-0001-9173-7208

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14 pages, 3281 KiB  
Article
Frankincense (Boswellia serrata) Extract Effects on Growth and Biofilm Formation of Porphyromonas gingivalis, and Its Intracellular Infection in Human Gingival Epithelial Cells
by David Vang, Aline Cristina Abreu Moreira-Souza, Nicholas Zusman, German Moncada, Harmony Matshik Dakafay, Homer Asadi, David M. Ojcius and Cassio Luiz Coutinho Almeida-da-Silva
Curr. Issues Mol. Biol. 2024, 46(4), 2991-3004; https://doi.org/10.3390/cimb46040187 - 30 Mar 2024
Cited by 1 | Viewed by 2920
Abstract
Frankincense is produced by Boswellia trees, which can be found throughout the Middle East and parts of Africa and Asia. Boswellia serrata extract has been shown to have anti-cancer, anti-inflammatory, and antimicrobial effects. Periodontitis is an oral chronic inflammatory disease that affects nearly [...] Read more.
Frankincense is produced by Boswellia trees, which can be found throughout the Middle East and parts of Africa and Asia. Boswellia serrata extract has been shown to have anti-cancer, anti-inflammatory, and antimicrobial effects. Periodontitis is an oral chronic inflammatory disease that affects nearly half of the US population. We investigated the antimicrobial effects of B. serrata extract on two oral pathogens associated with periodontitis. Using the minimum inhibitory concentration and crystal violet staining methods, we demonstrated that Porphyromonas gingivalis growth and biofilm formation were impaired by treatment with B. serrata extracts. However, the effects on Fusobacterium nucleatum growth and biofilm formation were not significant. Using quantification of colony-forming units and microscopy techniques, we also showed that concentrations of B. serrata that were not toxic for host cells decreased intracellular P. gingivalis infection in human gingival epithelial cells. Our results show antimicrobial activity of a natural product extracted from Boswellia trees (B. serrata) against periodontopathogens. Thus, B. serrata has the potential for preventing and/or treating periodontal diseases. Future studies will identify the molecular components of B. serrata extracts responsible for the beneficial effects. Full article
(This article belongs to the Special Issue Frankincense (Heaven’s Gift)—Chemical and Biological Diversity)
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19 pages, 1750 KiB  
Review
Effects of Frankincense Compounds on Infection, Inflammation, and Oral Health
by Cássio Luiz Coutinho Almeida-da-Silva, Nallusamy Sivakumar, Homer Asadi, Anna Chang-Chien, M. Walid Qoronfleh, David M. Ojcius and Musthafa Mohamed Essa
Molecules 2022, 27(13), 4174; https://doi.org/10.3390/molecules27134174 - 29 Jun 2022
Cited by 29 | Viewed by 19665
Abstract
Boswellia trees, found throughout the Middle East and parts of Africa and Asia, are the source of frankincense oil. Since antiquity, frankincense has been traded as a precious commodity, but it has also been used for the treatment of chronic disease, inflammation, oral [...] Read more.
Boswellia trees, found throughout the Middle East and parts of Africa and Asia, are the source of frankincense oil. Since antiquity, frankincense has been traded as a precious commodity, but it has also been used for the treatment of chronic disease, inflammation, oral health, and microbial infection. More recently, the bioactive components of Boswellia trees have been identified and characterized for their effects on cancer, microbial infection (especially infection by oral pathogens), and inflammation. Most studies have focused on cell lines, but more recent research has also investigated effects in animal models of disease. As natural products are considered to be safer than synthetic drugs, there is growing interest in further developing the use of substances such as frankincense oil for therapeutic treatment. Full article
(This article belongs to the Special Issue Discovery of Bioactive Ingredients from Natural Products, 2nd Edition)
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13 pages, 2191 KiB  
Article
Cigarette Smoke Stimulates SARS-CoV-2 Internalization by Activating AhR and Increasing ACE2 Expression in Human Gingival Epithelial Cells
by Cassio Luiz Coutinho Almeida-da-Silva, Harmony Matshik Dakafay, Kaitlyn Liu and David M. Ojcius
Int. J. Mol. Sci. 2021, 22(14), 7669; https://doi.org/10.3390/ijms22147669 - 18 Jul 2021
Cited by 19 | Viewed by 7655
Abstract
A large body of evidence shows the harmful effects of cigarette smoke to oral and systemic health. More recently, a link between smoking and susceptibility to coronavirus disease 2019 (COVID-19) was proposed. COVID-19 is due to infection with severe acute respiratory syndrome coronavirus [...] Read more.
A large body of evidence shows the harmful effects of cigarette smoke to oral and systemic health. More recently, a link between smoking and susceptibility to coronavirus disease 2019 (COVID-19) was proposed. COVID-19 is due to infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which uses the receptor ACE2 and the protease TMPRSS2 for entry into host cells, thereby infecting cells of the respiratory tract and the oral cavity. Here, we examined the effects of cigarette smoke on the expression of SARS-CoV-2 receptors and infection in human gingival epithelial cells (GECs). We found that cigarette smoke condensates (CSC) upregulated ACE2 and TMPRSS2 expression in GECs, and that CSC activated aryl hydrocarbon receptor (AhR) signaling in the oral cells. ACE2 was known to mediate SARS-CoV-2 internalization, and we demonstrate that CSC treatment potentiated the internalization of SARS-CoV-2 pseudovirus in GECs in an AhR-dependent manner. AhR depletion using small interference RNA decreased SARS-CoV-2 pseudovirus internalization in CSC-treated GECs compared with control GECs. Our study reveals that cigarette smoke upregulates SARS-CoV-2 receptor expression and infection in oral cells. Understanding the mechanisms involved in SARS-CoV-2 infection in cells of the oral cavity may suggest therapeutic interventions for preventing viral infection and transmission. Full article
(This article belongs to the Section Molecular Microbiology)
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