In order to study the effects of Saussurea laniceps polysaccharides(SLPs)on the expression of inflammatory factors and antimicrobial peptide LL-37 in UVB-induced keratinocytes,SLPs were extracted by the ethanol therma...In order to study the effects of Saussurea laniceps polysaccharides(SLPs)on the expression of inflammatory factors and antimicrobial peptide LL-37 in UVB-induced keratinocytes,SLPs were extracted by the ethanol thermal reflux method,and SLPs at different concentrations were used to examine the inhibitory effect of COX-2(a key mediator of inflammatory pathway).A cell model of UVB irradiation-induced inflammation was established to determine the influence of SLPs on prostaglandin E2(PGE-2),TNF-αand IL-1βinflammatory factors,as well as the relationships of SLPs with LL-37 expression.An enzyme-linked immunosorbent assay(ELISA)and western blot analysis were used to detect the production of inflammatory factors and LL-37 antimicrobial peptide.The results showed that the inhibition rate of COX-2 was 82.41%at 1000μg/mL,and the expression of PGE-2,TNF-αand IL-1βinflammatory factors in HaCaT cells was significantly downregulated at 100μg/mL(P<0.01).In addition,SLPs at 50μg/mL and 100μg/mL concentrations enhanced the expression of LL-37 antimicrobial peptide(P<0.01),thereby down-regulating the expression of TNF-αand IL-1βinflammatory factors,then reducing skin inflammation.Conclusion:SLP can significantly inhibit the inflammatory response induced by UVB,and can further slow down the damage caused by inflammation to the skin by regulating LL-37 antimicrobial peptides,which has the potential to prevent skin inflammatory damage caused by UVB irradiation.展开更多
Cottonhead windhairdaisy (Saussurea laniceps Hand.-Mazz.) is one of the most famous and important medicinal herbs in China. Illegal collection from wild populations is increasingly threatening the present environment...Cottonhead windhairdaisy (Saussurea laniceps Hand.-Mazz.) is one of the most famous and important medicinal herbs in China. Illegal collection from wild populations is increasingly threatening the present environment of S. laniceps. Estab- lishment of an efficient method for micropropagation is the best way to change its endangered situation. When mature seeds of S. laniceps were cultured on hormone-free MS medium, plantlets were formed from germinated seeds in 7–10 d. Then 0.5 cm × 0.5 cm leaf explants were transplanted to MS medium supplemented with 1-naphthalene-acetic acid (NAA)/2,4-D and benzyladenine (BA)/KT and callus was achieved 10 d after transfer. Shoot bud regeneration occurred from callus cultured on MS medium supple- mented with different growth regulators 20 d after culturing. The regeneration percentages varied with the different components of plant growth regulators. The percent regeneration from callus pretreated at low temperature of 5°C increased significantly compared with those incubated at 23/20°C directly. Optimal regeneration was observed with explants on media supplemented with 1.5 mg·L–1 BA plus 0.2 mg·L–1 NAA. In the presence of 0.2 mg·L–1 NAA in half-strength MS, 78% of the shoots formed roots. Plantlets from explants showed 63% survival after acclimatization.展开更多
文摘In order to study the effects of Saussurea laniceps polysaccharides(SLPs)on the expression of inflammatory factors and antimicrobial peptide LL-37 in UVB-induced keratinocytes,SLPs were extracted by the ethanol thermal reflux method,and SLPs at different concentrations were used to examine the inhibitory effect of COX-2(a key mediator of inflammatory pathway).A cell model of UVB irradiation-induced inflammation was established to determine the influence of SLPs on prostaglandin E2(PGE-2),TNF-αand IL-1βinflammatory factors,as well as the relationships of SLPs with LL-37 expression.An enzyme-linked immunosorbent assay(ELISA)and western blot analysis were used to detect the production of inflammatory factors and LL-37 antimicrobial peptide.The results showed that the inhibition rate of COX-2 was 82.41%at 1000μg/mL,and the expression of PGE-2,TNF-αand IL-1βinflammatory factors in HaCaT cells was significantly downregulated at 100μg/mL(P<0.01).In addition,SLPs at 50μg/mL and 100μg/mL concentrations enhanced the expression of LL-37 antimicrobial peptide(P<0.01),thereby down-regulating the expression of TNF-αand IL-1βinflammatory factors,then reducing skin inflammation.Conclusion:SLP can significantly inhibit the inflammatory response induced by UVB,and can further slow down the damage caused by inflammation to the skin by regulating LL-37 antimicrobial peptides,which has the potential to prevent skin inflammatory damage caused by UVB irradiation.
基金Supported by the National Natural Science Foundation of China (Grant No. 30271067),Fok Ying Tung Education Foundation (71030) and Key Teachers Foundation of the Educational Ministry of China
文摘Cottonhead windhairdaisy (Saussurea laniceps Hand.-Mazz.) is one of the most famous and important medicinal herbs in China. Illegal collection from wild populations is increasingly threatening the present environment of S. laniceps. Estab- lishment of an efficient method for micropropagation is the best way to change its endangered situation. When mature seeds of S. laniceps were cultured on hormone-free MS medium, plantlets were formed from germinated seeds in 7–10 d. Then 0.5 cm × 0.5 cm leaf explants were transplanted to MS medium supplemented with 1-naphthalene-acetic acid (NAA)/2,4-D and benzyladenine (BA)/KT and callus was achieved 10 d after transfer. Shoot bud regeneration occurred from callus cultured on MS medium supple- mented with different growth regulators 20 d after culturing. The regeneration percentages varied with the different components of plant growth regulators. The percent regeneration from callus pretreated at low temperature of 5°C increased significantly compared with those incubated at 23/20°C directly. Optimal regeneration was observed with explants on media supplemented with 1.5 mg·L–1 BA plus 0.2 mg·L–1 NAA. In the presence of 0.2 mg·L–1 NAA in half-strength MS, 78% of the shoots formed roots. Plantlets from explants showed 63% survival after acclimatization.
