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.

Porphyromonas gingivalis is a keystone pathogen in periodontitis, known for its ability to invade gingival epithelial cells and persist intracellularly. Conventional antimicrobials are often ineffective against intracellular pathogens, and natural products remain poorly explored in this context. Here, we investigated the antimicrobial effects of Boswellia serrata extract and its bioactive compounds on the dynamics of P. gingivalis infection in human gingival epithelial cells. During early times of infection, B. serrata extracts stimulate endocytic mechanisms and increased bacterial internalization, suggesting a modulation of epithelial uptake mechanisms. At later times of infection, B. serrata increased production of reactive oxygen species (ROS) in host cells and markedly reduced intracellular bacterial load. The antimicrobial effect was abolished by the ROS scavenger N-acetylcysteine, confirming a role for oxidative mechanisms in the clearance of P. gingivalis. Similar results were obtained with 3-O-acetyl-11-keto-β-boswellic acid (AKBA), one of the major boswellic acid derivatives found in B. serrata extract. These findings reveal a dual role of B. serrata compounds in response to P. gingivalis infection, in which B. serrata initially facilitates bacterial entry and subsequently promotes ROS-dependent intracellular killing. These findings provide new mechanistic insights into the regulation of host-pathogen interactions by the natural products found in B. serrata. Our results support the therapeutic potential of B. serrata–derived compounds for managing periodontal infections.

Boswellia trees are the source of frankincense, 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 anti-microbial 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, there were no significant effects on Fusobacterium nucleatum growth and biofilm formation. Using colony-forming units quantification 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 therapeutic potential for preventing and/or treating periodontal diseases. Future studies will identify molecular components of B. serrata extracts responsible for the beneficial effects.

Porphyromonas gingivalis is a keystone pathogen in periodontitis, known for its ability to invade gingival epithelial cells and persist intracellularly. Conventional antimicrobials are often ineffective against intracellular pathogens, and natural products remain poorly explored in this context. Here, we investigated the antimicrobial effects of Boswellia serrata extract and its bioactive compounds on the dynamics of P. gingivalis infection in human gingival epithelial cells. During early times of infection, B. serrata extracts stimulated phagocytosis and increased bacterial internalization, suggesting modulation of epithelial uptake mechanisms. At later times of infection, B. serrata increased production of reactive oxygen species (ROS) in host cells and markedly reduced intracellular bacterial load. The antimicrobial effect was abolished by the ROS scavenger N-acetylcysteine, confirming a role for oxidative mechanisms in the clearance of P. gingivalis. Similar results were obtained with 3-O-acetyl-11-keto-β-boswellic acid (AKBA), one of the major boswellic acid derivatives found in B. serrata extract. These findings reveal a dual role of B. serrata compounds in response to P. gingivalis infection, in which B. serrata initially facilitates bacterial entry and subsequently promotes ROS-dependent intracellula These findings provide new mechanistic insights into the regulation of host–pathogen interactions by the natural products found in B. serrata. Our results support the therapeutic potential of B. serrata-derived compounds for managing periodontal infections.