4. Discussion
Many people suffer from hair loss or hair thinning, despite the development of several medical treatments.
There fore, it is important to develop novel therapies that prevent hair loss and enhance hair
growth. In this respect, alternative medicine has attracted interest.
Although it has not yet been incorporated into mainstream of medical care, due to limited scientific evidence and incomplete knowledge of the mechanisms involved, alternative
medicine has become an increasingly attractive approach worldwide [26]. A. radix is a traditional herb medicine that is used in Korea and China to treat various diseases, such as aphthous stomatitis, local pain, toothache, and gingivitis [27].
It is known to have a number of pharmacological actions, such as analgesic and anti-inflammatory effects and protective effects against brain cell damage [28].
In the present report, we have demonstrated that the A. radix extract has outstanding hair growthpromoting effects in rodent models. In addition, the A. radix extract regulates the expression of growth factors in DP cells that are cultured in vitro.
As mentioned previously, various cytokines and growth factors play important roles in hair growth control.
IGF-1, VEGF, KGF, and HGF have stimulatory effects on hair follicle growth, whereas EGF and
TGF-b have inhibitory effects on hair follicle growth.
Our experimental data, therefore, suggest that the A. radix extract promotes hair growth by
upregulating VEGF expression.
VEGF plays important roles in angiogenesis, as well as in a number of inflammatory and neoplastic diseases
that are associated with neovascularization
[29]. The vascular network is associated with the hair growth cycle. [30—32]. Lachgar et al. have demonstrated that VEGF mRNA expression in normal human hair follicles varies during the hair cycle [33].
For example, in the anagen phase, VEGF mRNA is expressed strongly in the dermal papillae, whereas VEGF expression is decreased in the catagen and
telogen phases.
These authors also suggest that VEGF is an autocrine growth factor for DP cells [14].
The importance of VEGF in hair growth stimulation has been further supported by the study on the activity of minoxidil.
Minoxidil has been used extensively over the last 30 years to treat androgenic alopecia,
4. Discussion
Many people suffer from hair loss or hair thinning, despite the development of several medical treatments.
There fore, it is important to develop novel therapies that prevent hair loss and enhance hair
growth. In this respect, alternative medicine has attracted interest.
Although it has not yet been incorporated into mainstream of medical care, due to limited scientific evidence and incomplete knowledge of the mechanisms involved, alternative
medicine has become an increasingly attractive approach worldwide [26]. A. radix is a traditional herb medicine that is used in Korea and China to treat various diseases, such as aphthous stomatitis, local pain, toothache, and gingivitis [27].
It is known to have a number of pharmacological actions, such as analgesic and anti-inflammatory effects and protective effects against brain cell damage [28].
In the present report, we have demonstrated that the A. radix extract has outstanding hair growthpromoting effects in rodent models. In addition, the A. radix extract regulates the expression of growth factors in DP cells that are cultured in vitro.
As mentioned previously, various cytokines and growth factors play important roles in hair growth control.
IGF-1, VEGF, KGF, and HGF have stimulatory effects on hair follicle growth, whereas EGF and
TGF-b have inhibitory effects on hair follicle growth.
Our experimental data, therefore, suggest that the A. radix extract promotes hair growth by
upregulating VEGF expression.
VEGF plays important roles in angiogenesis, as well as in a number of inflammatory and neoplastic diseases
that are associated with neovascularization
[29]. The vascular network is associated with the hair growth cycle. [30—32]. Lachgar et al. have demonstrated that VEGF mRNA expression in normal human hair follicles varies during the hair cycle [33].
For example, in the anagen phase, VEGF mRNA is expressed strongly in the dermal papillae, whereas VEGF expression is decreased in the catagen and
telogen phases.
These authors also suggest that VEGF is an autocrine growth factor for DP cells [14].
The importance of VEGF in hair growth stimulation has been further supported by the study on the activity of minoxidil.
Minoxidil has been used extensively over the last 30 years to treat androgenic alopecia,
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