Indian Journal of Animal Research
Chief EditorK.M.L. Pathak
Print ISSN 0367-6722
Online ISSN 0976-0555
NAAS Rating 6.50
SJR 0.263
Impact Factor 0.4 (2024)
Chief EditorK.M.L. Pathak
Print ISSN 0367-6722
Online ISSN 0976-0555
NAAS Rating 6.50
SJR 0.263
Impact Factor 0.4 (2024)
Biocompatibility, Antimicrobial and Wound Healing Activities of Lavandula dentata Leaves Extract
Submitted08-05-2024|
Accepted19-06-2024|
First Online 15-07-2024|
Background: The human skin is a natural barrier that protects against external stress, but its physiological structure can be compromised when it gets damaged. In the field of medical science, wounds are a significant issue that requires immediate attention. Lavandula species are used in the food, perfume and cosmetics industries due to their antimicrobial, anti-inflammatory and wound-healing properties.
Methods: The present study was done to assess the biocompatibility, antimicrobial and wound-healing potential of L. dentata leave methanolic extract (LE) that is cultivated in the Taif region of Saudi Arabia. The biocompatibility of LE was analyzed against the normal human skin fibroblast (HSF) cell line using SRB assay. A quarter of LE IC50 was used for wound healing assay. Finally, Escherichia Coli, Staphylococcus aureus, Pseudomonas aeruginosa and Streptococcus pyogenes were used to determine LE antibacterial potential through the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) measurement.
Result: LE appears safe on HSF cell line with IC50 = 97 mg/mL. LE decreased wound width, wound area and the mean cell migratory rate of wound border cells during scratch closure, while increased the wound closure% in a time-dependent manner compared to negative control. LE shows antimicrobial potential against all four strains at MIC and MBC>3.0 mg/mL, except for Streptococcus pyogenes MIC= 3.0 mg/mL. In conclusion, LE offers therapeutic benefits against wound healing with an antimicrobial effect, however, higher concentrations of LE should be used to assess its effect.
The experiment took place at Taif University during the summer of 2023. L. dentata L. (fringed/ Toothed/ French lavender) leaves were freshly collected from Al Shafa area in Taif governorate (a high-altitude region located at an elevation of 1,879 m (6,165 ft) above sea level, with coordinates: 21°162 30.343 N 40°242 22.163 E), Saudi Arabia. They were identified and authenticated by Dr. Hussein, N. R. A. (Botany Department, Faculty of Science, South Valley University, Qena, Egypt) as Lavandula dentata L. Sp. Pl.: 572 (1753), Lamiaceae Martinov.
Before use, leaves were rinsed in water, dried away from the sun and ground to obtain fine powder (Fig 1). The powder was mixed with 200 mL of methanol (lab grade). The mixture was macerated overnight and then filtered using filter paper. Later, the marc (the damp solid material after filtration) was macerated again in 200 ml of methanol for 1 h and then filtered, this step was repeated twice. Finally, 600 ml of the collected methanol was evaporated under vacuum at 40°C, yielding 1.289 g of methanolic extract of lavender leaves (LE) (Labarbe et al., 1999).
Cell viability (%) = Mean OD570nm of treated cells/Mean OD570nm of control (untreated cells) ×100.
The data was plotted using OriginLab and the IC50 value for LE was determined.
For the wound healing assay, HSF cell lines were cultured in DMEM media, scratched and then treated with fresh media containing ¼ IC50 of LE (24.24 mg/mL) at 24, 48, 72 and 96h. Negative control wells were replenished with fresh medium (only). Images were taken using an inverted microscope at 24, 48, 72 and 96h intervals. At the end of each timing, the wound width, migration rate, wound area and wound closure % were calculated (as mean ± SD) using MII ImageView software version 3.7 according to Main et al., (2019) and Martinotti and Ranzato (2019).
The antibacterial effect of lavender leaf extract (serial two-fold dilutions of LE 3 mg/mL to 0.005 mg/mL) was determined by the Clinical and Laboratory Standards Institute (CLSI) methods. Four different bacterial strains were obtained from Nawah Scientific Inc. (Mokatam, Cairo, Egypt) and used in the present study: Escherichia Coli ATCC 8739, Staphylococcus aureus ATCC 29213, Pseudomonas aeruginosa ATCC 9027 and Streptococcus pyogenes ATCC 19615. Colony suspension and broth macrodilution were prepared according to EUCAST (2003). An antibiotic, ciprofloxacin (3 mg/mL to 0.005 mg/mL), was used as a positive control. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of LE against four different aerobic bacterial strains (Escherichia Coli, Staphylococcus aureus, Pseudomonas aeruginosa and Streptococcus pyogenes) were done. The MBC results of LE were analyzed using a one-way ANOVA test. The significance of all the statistical tests was determined at p<0.05 using GraphPad Prism 8.0.1 software.
Fig 4: Graph showing wound width (A) and wound area (B) in the presence of LE (24.24 ìg/mL) at different interval times (0, 24h, 48h, 72h and 96h) in comparison to control. Bar graph illustrating the mean cell migratory rate of wound border cells during scratch closure (C) and wound closure % at indicated time points (D) during the scratch wound assay.
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