June 2021 in “Journal of Cosmetic Dermatology” Laser treatment shows promise for hair growth, but needs further research.
In this study, collagen type I, skin fibroblasts, and macrophages did not show remarkable changes in androgenic alopecia patients' scalp tissues after treatment with 1550 nm fractional Er:Glass laser, despite improved hair regrowth.
8 citations
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February 2020 in “Journal of Drug Delivery Science and Technology” This study demonstrated that using PLGA nanoparticles to deliver chlorogenic acid significantly increased type 17 collagen production in human epidermal cells, indicating potential for improved skincare formulations.
July 2022 in “The journal of investigative dermatology/Journal of investigative dermatology” This study found that apocynin restored COL17A1 expression in human keratinocytes and reduced UVB-induced cellular senescence, DNA damage, and cell cycle arrest.
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.
July 1995 in “Journal of Dermatological Science” 
September 2022 in “PubMed” This study found that decreased COL17α1 expression in aging mouse skin is associated with reduced proliferation of epidermal stem cells and may contribute to thinner epidermis and slower wound healing.
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.
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.
April 2023 in “Journal of Investigative Dermatology” In this study, recombinant type III collagen was found to promote fibroblast proliferation and migration, suggesting potential anti-aging and repairing effects, although it was only effective in significantly inhibiting IL-6, not TNF-α, secretion.
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.
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.
56 citations
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November 2003 in “Journal of Investigative Dermatology” This study identified altered expression of MMP-19 in the skin's epidermal layers during diseases like psoriasis and eczema, implying a role in disease processes.
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.
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.
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.
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.
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.
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.
1 citations
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June 2019 in “Current developments in nutrition” This case study reports that pancreatic enzyme replacement and fatty acid supplementation improved symptoms of fat malabsorption and essential fatty acid deficiency in a patient with EDS-4.
April 2018 in “Journal of Investigative Dermatology” This study found that treating human dermal fibroblast cells with ginsenoside Rd increased the expression of mRNA associated with the dermal-epidermal junction, suggesting potential as an anti-aging cosmetic ingredient.
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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June 2020 in “European Radiology Experimental” This study found that single-dose x-ray irradiation in rat calvaria skin led to morphological changes in collagen fibers, disorganization, and a temporary absence of sebaceous glands and hair follicles.
February 2014 in “PubMed” This study reports that high-purity rHFSCs with strong proliferation and high VEGF165 expression can be efficiently obtained, facilitating tissue engineering applications like artificial hair follicles and skin construction.
October 2025 in “Cell Proliferation” In laboratory research, investigators found that apoptotic vesicles from interleukin-10-treated fibroblasts promote wound healing and reduce fibrotic scarring by enhancing mitochondrial function, modulating collagen composition, and inhibiting the Hedgehog signalling pathway, offering potential for regenerative medicine applications.
June 2024 in “Synthetic and systems biotechnology” In this study, researchers identified a collagen fragment, sample-1707, expressed in E. coli, which forms nanofibers and promotes blood clotting, osteoblast differentiation, and skin cell regeneration, making it a promising biomaterial for skin care, with a large-scale production yield of 600 mg/L.
April 2018 in “The journal of investigative dermatology/Journal of investigative dermatology” This study found that age-related changes in scalp dermal fibroblasts, including increased MMP-1 and reduced ECM components, may significantly affect the hair follicle environment and contribute to hair aging.
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.
April 2018 in “Journal of Investigative Dermatology” The study found that, unlike in actinic keratosis and squamous cell carcinoma, basal cell carcinoma tissues showed higher expression of nidogen1 and Col4 in both basement membranes and surrounding stroma compared to normal skin.
April 2018 in “Journal of Investigative Dermatology” This study found that Anigozanthos Flavidus flower extract may improve skin elasticity and reduce wrinkles by increasing essential extracellular matrix proteins in both in vitro and in vivo settings.