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    Pharmacognosy CommunicationsNOW IN
    Article

    Antimicrobial Activity of Acacia disparrima Benth. and Acacia leiocalyx Pedley Leaf Extracts in Combination with Antibiotics against Bacterial Triggers of Selected Autoimmune Diseases

    Ruxin Guo1, Xin Yang1, Ian Edwin Cock1,2★★ Corresponding author

    1. 1School of Environment and Science, Griffith University, 170 Kessels Rd, Nathan, Queensland, AUSTRALIA..
    2. 2Centre for Planetary Health and Food Security, Nathan Campus, Griffith University, 170 Kessels Rd, Nathan, Queensland, AUSTRALIA..

    CORRESPONDENCE

    Ian Edwin Cock

    School of Environment and Science, Griffith University, 170 Kessels Rd, Nathan, Queensland, AUSTRALIA. .

    i.cock@griffith.edu.au

    Received: 04-04-2023; Revised: 26-04-2023; Accepted: 20-05-2023.

    Volume 13, Issue 3 · pp. 104–115 · PUBLISHED · DOI: 10.5530/pc.2023.3.18

    View on Pharmacogn. Commn. original site ↗

    ABSTRACT

    Background:Plants of the genus Acacia have been used by Australian Aborigines to treat a variety of conditions including bacterial pathogens and inflammation. Despite this, many Acacia spp. have not been evaluated for the ability to inhibit the growth of bacterial triggers of autoimmune inflammatory diseases. This study evaluated the effects of Acacia disparrima and Acacia leiocalyx leaf extracts alone and in combination against some bacterial triggers of rheumatoid arthritis, ankylosing spondylitis and multiple sclerosis. Results: Acacia disparrima and Acacia leiocalyx leaf extracts displayed noteworthy antibacterial activity against several bacterial triggers of autoimmune diseases. The methanolic extracts were particularly good inhibitors of P. mirabilis, K. pneumoniae, and A. baylyi with MIC values <1000µg/mL, but were ineffective against P. aeruginosa. Furthermore, combining the extracts with conventional antibiotics resulted in significant potentiation of the inhibitory activity for some combinations. Interestingly, all of the synergistic interactions contained tetracycline as the antibiotic component, whilst all of the antagonistic combinations contained either gentamicin or ciprofloxacin as the antibiotic component. None of the individual components (nor the combinations) were toxic in the ALA assay. Conclusion:The majority of combinational effects were either additive or indifferent, thereby alleviating some concern related to the concurrent use of A. disparrima and A. leiocalyx whilst also taking conventional antibiotics. A few notable combinations were identified, indicating the need for further in vivo testing.

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      Guo, R., Yang, X., & Cock, I. E. (). Antimicrobial Activity of Acacia disparrima Benth. and Acacia leiocalyx Pedley Leaf Extracts in Combination with Antibiotics against Bacterial Triggers of Selected Autoimmune Diseases. Pharmacognosy Communications, 13(3), 104–115. https://doi.org/10.5530/pc.2023.3.18