Journal
ANNALS OF DERMATOLOGY
Volume 28, Issue 5, Pages 586-592Publisher
KOREAN DERMATOLOGICAL ASSOC
DOI: 10.5021/ad.2016.28.5.586
Keywords
Alopecia; Hair; Hair follicle; Microneedle
Categories
Funding
- National Research Foundation of Korea grant - Korean government [2011-0008687]
- National Research Foundation of Korea [2011-0008687] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Background: Microneedle is a method that creates transdermal microchannels across the stratum corneum barrier layer of skin. No previous study showed a therapeutic effect of microneedle itself on hair growth by wounding. Objective: The aim of this study is to investigate the effect of repeated microwound formed by microneedle on hair growth and hair growth-related genes in a murine model. Methods: A disk microneedle roller was applied to each group of mice five times a week for three weeks. First, to identify the optimal length and cycle, microneedles of lengths of 0.15 mm, 0.25 mm, 0.5 mm, and 1 mm and cycles of 3, 6, 10, and 13 cycles were applied. Second, the effect of hair growth and hair-growth-related genes such as Wnt3a, beta-catenin, vascular endothelial growth factor (VEGF), and Wnt10b was observed using optimized microneedle. Outcomes were observed using visual inspection, real-time polymerase chain reaction, and immunohistochemistry. Results: We found that the optimal length and cycle of micro needle treatment on hair growth was 0.25 mm/10 cycles and 0.5 mm/10 cycles. Repeated microneedle stimulation promoted hair growth, and it also induced the enhanced expression of Wnt3a, beta-catenin, VEGF, and Wnt10b. Conclusion: Our study provides evidence that microneedle stimulation can induce hair growth via activation of the Wnt/beta-catenin pathway and VEGF. Combined with the drug delivery effect, we believe that microneedle stimulation could lead to new approaches for alopecia.
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