June 2021 in “Journal of Cosmetic Dermatology” Laser treatment shows promise for hair growth, but needs further research.
May 2025 in “International Journal of Biological Macromolecules” In this study, an innovative microneedle platform loaded with IGF-1 and modified collagen was reported to significantly promote hair regeneration, enhance neovascularization, and reduce inflammation in a mouse model of androgenetic alopecia, outperforming the commonly used minoxidil treatment.
This study found that recombinant human type XVII collagen (rhCOL17A1) promotes hair growth by activating the Wnt/β-catenin and SHH/GLI signaling pathways and increasing type XVII collagen expression, with significant effects observed in both cell and mouse models.
1 citations
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December 2025 in “International Journal of Molecular Sciences” This study reported that atelocollagen enhances collagen synthesis and reduces oxidative stress in aged skin by increasing glycine uptake through GlyT1, resulting in improved skin elasticity and collagen density in aged mice, with effects superior to glycine alone.
3 citations
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October 2021 in “PLoS ONE” In this study, topical piperonylic acid was found to improve wound healing in mice by activating EGFR and modulating gene expression related to the healing process.
56 citations
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December 1990 in “Differentiation” Growth factors can either promote or inhibit hair follicle cell growth and collagen breakdown.
4 citations
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September 2012 in “Journal of dermatological science” The hair follicle's connective tissue is a key source of a certain collagen in human scalp skin.
April 2023 in “Journal of Investigative Dermatology” The study identified increased IL-24 expression in keratinocytes and fibroblasts exposed to particulate matter, contributing to skin aging by promoting conditions similar to age-related changes such as increased MMP1 expression and decreased type I collagen production.
30 citations
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February 2010 in “The journal of investigative dermatology/Journal of investigative dermatology” This study found that the orphan protein Plet-1 is expressed in specific keratinocytes of mouse hair follicles and may regulate keratinocyte interactions with inert tissues by affecting migration and adhesion.
5 citations
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December 2024 in “Bioengineering” In this study, conditioned medium from genetically engineered mesenchymal stem cells significantly improved wound healing, re-epithelialization, hair follicle formation, and angiogenesis in diabetic mice, suggesting a promising new approach for diabetic ulcer care.
20 citations
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April 2009 in “Cell Biology International” This study demonstrates that bulge KSCs from hair follicles can transdifferentiate into corneal epithelial-like cells under specific conditions, which could support bioengineered cornea development.
27 citations
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September 2015 in “Drug Design Development and Therapy” This study suggests that type IV collagenases, MMP-2 and MMP-9, play important roles in the hair cycle by regulating the expression of VEGF, IGF-1, and TGF-β in mice.
26 citations
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January 2015 in “PubMed” This study found that the type IV collagenases, MMP-2 and MMP-9, play significant roles in the hair cycle, potentially through their influence on VEGF, IGF-1, and TGF-β expression.
16 citations
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February 2007 in “Plastic and Reconstructive Surgery” This study found that keratinocytes show increased expression of the TGF-β system and collagen type I with age, suggesting a heightened profibrotic response during skin differentiation associated with scarring.
9 citations
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July 2020 in “Biomedicine & Pharmacotherapy” This study found that Pep-1-mediated mitochondrial transplantation was as effective as PRP therapy in restoring hair loss related to aging in mice, with distinct improvements in hair and skin-related measures.
24 citations
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December 1957 in “Experimental Cell Research” This study observed that the glassy layer of hair follicles in guinea pigs consists of thick collagen-type fibrils organized into two distinct arrays, whereas in young mice, the fibrils are thinner and develop between the outer root sheath and fibroblasts.
1 citations
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February 2023 in “Tropical Journal of Pharmaceutical Research” This study found that polysulfonic acid mucopolysaccharide may reduce skin scarring in rats by influencing the TGF-β1/Smad signaling pathway.
May 2024 in “International journal of medicine and psychology.” In this study, combining transcranial electrical stimulation with bisphosphonate therapy in patients with postmenopausal osteoporosis resulted in a protective effect on bone collagen synthesis, as indicated by higher P1NP levels over 12 months, compared to bisphosphonates alone.
225 citations
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April 2018 in “Journal of Investigative Dermatology” Two main types of fibroblasts with unique functions and additional subtypes were identified in human skin.
4 citations
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May 2019 in “Zeitschrift für Naturforschung C” This study found that Ishige sinicola extract stimulated osteoblast differentiation and bone formation in MC3T3-E1 cells, suggesting potential use for osteoporosis prevention and treatment.
April 2023 in “Journal of Investigative Dermatology” HA-iMSC-EVs can improve skin aging by boosting cell growth and restoring collagen and elastin.
9 citations
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January 2017 in “Food & Nutrition Research” In this study, rice bran mineral extract increased expression of anagen-related proteins and decreased inflammatory markers in human dermal papilla cells, suggesting potential for hair growth enhancement and prevention of hair loss.
October 2025 in “Journal of the Endocrine Society” This research review observed that topical hormone replacement therapy, particularly estradiol and estradiol-testosterone combinations, significantly increased Type I and III collagen synthesis in the skin of postmenopausal women, suggesting benefits against collagen loss-related skin aging effects such as reduced elasticity and increased dryness.
February 2024 in “Journal of Dermatological Science” This study examined the formation of acquired curved hair and found that the fusion of hair matrix cells during follicle regeneration contributes to asymmetric follicle shapes and curved hair, potentially linked to changes in type IV collagen and protein expression levels.
December 2022 in “Research Square (Research Square)” This study found that an extract from the herbal medicine Ophioglossum vulgatum Linn. showed potential hair growth promotion and increased ATP and catalase activity in cell assays, suggesting its use in treating alopecia.
In this study, topical application of piperonylic acid was observed to accelerate wound healing in mice by enhancing EGFR activation, keratinocyte modulation, and collagen deposition, suggesting its potential as a treatment for skin injuries.
September 2016 in “Journal of Dermatological Science” This study found that P. cornucopiae extract showed antioxidant and protective effects on human skin fibroblasts, suggesting its potential as an antiaging agent by preventing oxidative stress-induced collagen breakdown.
13 citations
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August 2017 in “Journal of Cellular Physiology” In this study, researchers found that in mouse models of alopecia areata, the expression of immune-regulating molecules PD-L1 and PD-L2 in dermal fibroblasts is increased by activated T cells, potentially indicating a lack of negative immune control in affected skin.
13 citations
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July 2012 in “Dermatologic Surgery” Platelet-rich plasma (PRP) may help promote hair growth and improve graft survival after hair transplantation, but more research is needed to confirm its effectiveness and determine the best dosage.
29 citations
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March 2020 in “Stem Cell Research & Therapy” This study suggests that adipose-derived mesenchymal stem cells from diabetic mice can enhance wound healing by promoting fibroblast growth, migration, angiogenesis, and differentiation into fibroblasts and endothelial cells.