Investigation of skin permeation, ex vivo inhibition of venom-induced tissue destruction, and wound healing of African plants used against snakebites
Standard
Investigation of skin permeation, ex vivo inhibition of venom-induced tissue destruction, and wound healing of African plants used against snakebites. / Molander, Marianne; Staerk, Dan; Mørck Nielsen, Hanne; Brandner, Johanna M; Diallo, Drissa; Kusamba Zacharie, Chifundera; van Staden, Johannes; Jäger, Anna K.
In: J ETHNOPHARMACOL, Vol. 165, 11.02.2015, p. 1-8.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
Harvard
APA
Vancouver
Bibtex
}
RIS
TY - JOUR
T1 - Investigation of skin permeation, ex vivo inhibition of venom-induced tissue destruction, and wound healing of African plants used against snakebites
AU - Molander, Marianne
AU - Staerk, Dan
AU - Mørck Nielsen, Hanne
AU - Brandner, Johanna M
AU - Diallo, Drissa
AU - Kusamba Zacharie, Chifundera
AU - van Staden, Johannes
AU - Jäger, Anna K
N1 - Copyright © 2015. Published by Elsevier Ireland Ltd.
PY - 2015/2/11
Y1 - 2015/2/11
N2 - ETHNOPHARMACOLOGICAL RELEVANCE: Snakebite envenomation causes 5000-10,000 mortalities and results in more than 5-15,000 amputations in sub-Saharan Africa alone every year. The inaccessibility of antiserum therapy is a vast problem, and only about 2.5% of the actual need for antiserum in Africa is covered. Numerous plants have shown in vitro inhibitory activity against one or more of the hydrolytic enzymes involved in snakebite-induced necrosis. However, a more thorough examination of the plant species in ex vivo and in vitro cell assay models is needed to test their ability to inhibit necrosis.MATERIALS AND METHODS: Extracts which had previously shown in vitro inhibitory activity against necrosis enzymes, were tested in an ex vivo air-liquid-interface model, and a wound healing scratch assay as well as for their ability to permeate the skin barrier and inhibit venom induced cell death.RESULTS: Of the 30 extracts; 14 water extracts and 16 ethanol extracts, tested at a concentration of 10μg/mL, only the ethanol extracts of Tamarindus indica and Paullinia pinnata resulted in a small but significant increase in cell migration of around 10% compared to treatment with buffer after 24h treatment. The remaining extracts showed no effect, or they even delayed the cell migration compared to the treatment with buffer. After 48h treatment 10 of the tested extracts showed a decreased cell migration compared to no treatment. At a 100μg/mL concentration all the extracts inhibited cell migration and five extracts killed some of the cells, while four extracts killed all the cells. Ten of the thirty extracts were tested in a Franz cell set-up but none of the extracts tested did permeate the skin barrier over a 48h period, and will therefore be of very limited use topically in the initial treatment of snakebites in its present form. None of the extracts were able to directly interact with the enzyme to lower the cell toxicity of the venom. Two extracts, Dichrostachys cinerea and Grewia mollis, were tested in the ex vivo model, but none of them inhibited the tissue destruction caused by venom.CONCLUSION: On the basis of this study, topical treatment with plant extracts for snakebite-induced tissue necrosis cannot be recommended.
AB - ETHNOPHARMACOLOGICAL RELEVANCE: Snakebite envenomation causes 5000-10,000 mortalities and results in more than 5-15,000 amputations in sub-Saharan Africa alone every year. The inaccessibility of antiserum therapy is a vast problem, and only about 2.5% of the actual need for antiserum in Africa is covered. Numerous plants have shown in vitro inhibitory activity against one or more of the hydrolytic enzymes involved in snakebite-induced necrosis. However, a more thorough examination of the plant species in ex vivo and in vitro cell assay models is needed to test their ability to inhibit necrosis.MATERIALS AND METHODS: Extracts which had previously shown in vitro inhibitory activity against necrosis enzymes, were tested in an ex vivo air-liquid-interface model, and a wound healing scratch assay as well as for their ability to permeate the skin barrier and inhibit venom induced cell death.RESULTS: Of the 30 extracts; 14 water extracts and 16 ethanol extracts, tested at a concentration of 10μg/mL, only the ethanol extracts of Tamarindus indica and Paullinia pinnata resulted in a small but significant increase in cell migration of around 10% compared to treatment with buffer after 24h treatment. The remaining extracts showed no effect, or they even delayed the cell migration compared to the treatment with buffer. After 48h treatment 10 of the tested extracts showed a decreased cell migration compared to no treatment. At a 100μg/mL concentration all the extracts inhibited cell migration and five extracts killed some of the cells, while four extracts killed all the cells. Ten of the thirty extracts were tested in a Franz cell set-up but none of the extracts tested did permeate the skin barrier over a 48h period, and will therefore be of very limited use topically in the initial treatment of snakebites in its present form. None of the extracts were able to directly interact with the enzyme to lower the cell toxicity of the venom. Two extracts, Dichrostachys cinerea and Grewia mollis, were tested in the ex vivo model, but none of them inhibited the tissue destruction caused by venom.CONCLUSION: On the basis of this study, topical treatment with plant extracts for snakebite-induced tissue necrosis cannot be recommended.
U2 - 10.1016/j.jep.2015.02.014
DO - 10.1016/j.jep.2015.02.014
M3 - SCORING: Journal article
C2 - 25681542
VL - 165
SP - 1
EP - 8
JO - J ETHNOPHARMACOL
JF - J ETHNOPHARMACOL
SN - 0378-8741
ER -
