[Experimental study on Dendrobium candidum polysaccharides on promotion of hair growth].
OBJECTIVE
To observe the effect and mechanism of Dendrobium candidum polysaccharides (DCP) in promoting hair growth, in order to lay a foundation for the development and utilization of D. candidum.


METHODS
The water-extraction and alcohol-precipitation method was adopted to extract DCP, and the phenol-sulphuric acid method was used to determine its content. Thirty C57BL6J mice were collected to establish the hair loss model with hair removal cream. They were randomly divided into the control group, the positive control group and the DCP group, and given 0.2 mL of ultra-pure water, minoxidil tincture and DCP (5.0 g x L(-1)) 21 days. The mice hair growth scoring standard was adopted to evaluate the hair growth of C57BL/6J mice at 7, 14 d. The hairs in unit hair-losing areas of treated C57BL/6J mice at 21 d were weighed to evaluate the effect of DCP on the promotion of hair growth. MTT assay and RT-PCR method were used to evaluate the effect of DCP on the proliferatin of HaCaT cells and the mRNA expression of VEGF in HaCaT cells.


RESULTS
The extraction percent of DCP was 29.87%, and its content was 79.65%. The average scores for the hair growth and weight of C57BL/6J mice of DCP group were much higher than the control group. The survival rate and mRNA expression of VEGF of HaCaT cells were much higher than the control group.


CONCLUSIONS
DCP has the effect in promoting hair growth. Its mechanism may be related to the up-regulation of the mRNA expression of VEGF.
Jian
J
Chen
Hui
H
Qi
Jin-Biao
JB
Li
Yan-Qun
YQ
Yi
Dan
D
Chen
Xiao-Hong
XH
Hu
Mei-Ling
ML
Wang
Xing-Li
XL
Sun
Xiao-Yong
XY
Wei
D000818:Animals; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D031667:Dendrobium / Q000737:chemistry*; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects; D006197:Hair / Q000187:drug effects* / Q000254:growth & development*; D006801:Humans; D051379:Mice; D008810:Mice, Inbred C57BL; D011134:Polysaccharides / Q000494:pharmacology*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D042461:Vascular Endothelial Growth Factor A / Q000235:genetics
D011134:Polysaccharides; D012333:RNA, Messenger; D042461:Vascular Endothelial Growth Factor A