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Opt. Express"],"published-print":{"date-parts":[[2023,11,1]]},"abstract":"<jats:p>The identification of crucial targets for hair regrowth in androgenetic alopecia (AGA) involves determining important characteristics and different stages during the process of hair follicle regeneration. Traditional methods for assessing key features and different stages of hair follicle primarily involve taking skin tissue samples and determining them through various staining or other methods. However, non-invasive assessment methods have been long sought. Therefore, in this study, endogenous fluorescence signals from skin keratin and second harmonic signals from skin collagen fibers were utilized as probes, two-photon excited fluorescence (TPEF) and second harmonic generation (SHG) imaging techniques were employed to non-invasively assess hair shafts and collagen fibers in AGA mice <jats:italic>in vivo<\/jats:italic>. The TPEF imaging technique revealed that the alternation of new and old hair shafts and the different stages of the growth period in AGA mice were delayed. In addition, SHG imaging found testosterone reduced hair follicle area and miniaturized hair follicles. The non-invasive TPEF and SHG imaging techniques provided important methodologies for determining significant characteristics and different stages of the growth cycle in AGA mice, which will facilitate future non-invasive assessments on human scalps <jats:italic>in vivo<\/jats:italic> and reduce the use of animal testing.<\/jats:p>","DOI":"10.1364\/boe.503312","type":"journal-article","created":{"date-parts":[[2023,9,26]],"date-time":"2023-09-26T16:00:36Z","timestamp":1695744036000},"page":"5870","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Non-invasive assessment of hair regeneration in androgenetic alopecia mice in vivo using two-photon and second harmonic generation imaging"],"prefix":"10.1364","volume":"14","author":[{"given":"Gaiying","family":"He","sequence":"first","affiliation":[{"name":"Experimental Research Center"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Menghua","family":"Liu","sequence":"additional","affiliation":[{"name":"Beijing University of Chinese Medicine"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fenglong","family":"Wang","sequence":"additional","affiliation":[{"name":"Beijing University of Chinese Medicine"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuqing","family":"Sun","sequence":"additional","affiliation":[{"name":"Tsinghua University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu","family":"Cao","sequence":"additional","affiliation":[{"name":"Institute of Geriatrics, Xiyuan Hospital"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanan","family":"Sun","sequence":"additional","affiliation":[{"name":"Experimental Research Center"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuhua","family":"Ma","sequence":"additional","affiliation":[{"name":"Experimental Research Center"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi","family":"Wang","sequence":"additional","affiliation":[{"name":"Experimental Research Center"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2023,10,19]]},"reference":[{"key":"boe-14-11-5870-R1","doi-asserted-by":"publisher","first-page":"415","DOI":"10.1016\/j.jaad.2014.05.008","volume":"71","author":"Mubki","year":"2014","journal-title":"J. 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