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Organic Extract of

Tiago Rafael de Sousa Nunes1, Marina Ferraz Cordeiro1,2, Fernanda Gomes Beserra1

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Justicia pectoralis Jacq. leaf extracts show potential as an antibacterial agent against Acinetobacter baumannii and Klebsiella pneumoniae. The organic extract also demonstrated significant inhibition of interferon-gamma (IFN-γ) in immune cells.

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Area of Science:

  • Phytochemistry and Pharmacology
  • Natural Product Research
  • Immunomodulation Studies

Background:

  • Justicia pectoralis Jacq. is a plant used in Brazilian folk medicine for various ailments.
  • Understanding its phytochemical composition and biological activities is crucial for validating traditional uses.
  • Previous studies have not fully explored its potential as an immunomodulatory and antibacterial agent.

Purpose of the Study:

  • To characterize the phytochemical profile of Justicia pectoralis leaf extracts.
  • To evaluate the cytotoxic, antibacterial, and immunomodulatory effects of these extracts.
  • To identify potential therapeutic applications based on scientific investigation.

Main Methods:

  • Preparation of aqueous (JPA) and organic (JPO) extracts from Justicia pectoralis leaves.
  • Phytochemical analysis using Thin-Layer Chromatography (TLC) and High-Performance Liquid Chromatography (HPLC).
  • In vitro assays for cytotoxicity (MTT, Trypan Blue), antibacterial activity (MIC, MBC), and cytokine inhibition (IFN-γ, IL-17A) via ELISA.

Main Results:

  • TLC and HPLC confirmed the presence of coumarins and flavonoids, including apigenin and ellagic acid, in both extracts.
  • The organic extract (JPO) exhibited cytotoxicity against TOLEDO cancer cells (IC50 ~57-69 μg/mL).
  • JPO demonstrated antibacterial activity against Acinetobacter baumannii and Klebsiella pneumoniae (MIC = 500 μg/mL) and significantly inhibited IFN-γ production at 100 μg/mL.

Conclusions:

  • Justicia pectoralis leaf extracts possess significant phytochemical constituents with potential biological activities.
  • The organic extract shows promise as an antibacterial agent against specific pathogens and as an inhibitor of IFN-γ.
  • Further research into Justicia pectoralis is warranted for its development as a therapeutic agent.