FAN Qing,GUAN Jian-hong.Toxicity and Efficacy of Water-eluted Fraction from Siegesbeckiae Herba Against Human Embryonic Lung Fibroblasts[J].Chinese Journal of Experimental Traditional Medical Formulae,2021,27(11):76-82.
FAN Qing,GUAN Jian-hong.Toxicity and Efficacy of Water-eluted Fraction from Siegesbeckiae Herba Against Human Embryonic Lung Fibroblasts[J].Chinese Journal of Experimental Traditional Medical Formulae,2021,27(11):76-82. DOI: 10.13422/j.cnki.syfjx.20211192.
Toxicity and Efficacy of Water-eluted Fraction from Siegesbeckiae Herba Against Human Embryonic Lung Fibroblasts
To detect the toxicity of water-eluted fraction from Siegesbeckiae Herba (SWEF) at different concentrations against MRC-5 human embryonic lung fibroblasts and its impacts on the expression of
α
7 nicotinic acetylcholine receptor (
α
7nAChR) and inflammatory factors, so as to figure out the active components responsible for toxicity and efficacy.
Method
2
The toxicities of SWEF at 1, 6, 10, 20, and 50 g·L
-1
against MRC-5 cells were determined by cell counting kit-8 (CCK-8) assay combined with flow cytometry and Trypan blue staining. The changes in
α
7nAChR expression and inflammatory factor levels before and after
α
7nAChR gene silencing were detected to reveal the pharmacodynamic effect of SWEF on MRC-5 cells.
Result
2
SWEF (≥6 g·L
-1
) obviously inhibited the viability of MRC-5 cells (
P
<
0.01) and promoted their apoptosis and necrosis (
P
<
0.01), with the half-maximal inhibitory concentration (IC
50
) being 6.03 g·L
-1
. The determination of
α
7nAChR expression and inflammatory factor levels in MRC-5 cells showed that SWEF contained
α
7nAChR agonist-like substance, which enhanced
α
7nAChR mRNA and protein expression (
P
<
0.05,
P
<
0.01) and decreased the inflammatory factor levels (
P
<
0.05,
P
<
0.01). SWEF down-regulated the inflammatory factors possibly by re-regulating
α
7nAChR mRNA expression, exhibiting a negative correlation between them (
P
<
0.01).
Conclusion
2
SWEF (≥6 g·L
-1
) is highly toxic to MRC-5 cells. Pharmacodynamic studies have confirmed that
α
7nAChR agonist-like substance contained in SWEF was responsible for the elevated
α
7nAChR expression and reduced inflammatory cytokines. It is inferred that excessive
α
7nAChR agonist-like substance may trigger the toxicity of
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