Activin A increases inner ear hair cell development, while follistatin decreases it.
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November 1992 in “Journal of dermatology” Hair cells grown in a lab showed specific hair proteins.
March 1995 in “The Journal of Dermatology” Immature hair cells can grow and change into different types of hair cells over time.
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July 1964 in “PubMed” Hair follicle cells become four types: medulla, cortex, cuticle, and inner root sheath.
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January 1981 in “PubMed” Hair medullary cells in mammals vary in complexity, with humans having more structured cells similar to inner root sheath cells.
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October 1989 in “PubMed” Optimized conditions and specific treatments enhance the growth of hair cells from C3H mice.
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February 2004 in “British Journal of Dermatology” Keratin in mouse hair follicles is complex and plays specific roles.
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January 2000 in “Acta Oto-Laryngologica” Epidermal growth factor increases extra hair cells in newborn rat ears.
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December 2007 in “The FASEB journal” There are two types of stem cells in rodent hair follicles, each with different keratin proteins.
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December 1991 in “Annals of the New York Academy of Sciences” Hair growth can be induced by certain cells found at the base of hair follicles, and these cells may also influence hair development and regeneration.
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April 2003 in “Journal of Investigative Dermatology” Four specific keratins in hair follicles help understand hair structure and function.
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May 2005 in “The American journal of dermatopathology/American journal of dermatopathology” The hair defect is due to abnormal inner root sheath keratinization.
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September 2004 in “Journal of Anatomy” The inner root sheath evolved to help hair grow safely through the skin in mammals.
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July 2006 in “Journal of Investigative Dermatology” K25, K27, and K28 are found in all inner root sheath layers of hair, while K26 is only in the cuticle.
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December 1990 in “PubMed” Keratinocytes in hair follicles differentiate similarly to skin cells, with specific patterns in different regions.
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May 2002 in “Journal of Investigative Dermatology” A new keratin, hK6irs1, is found in all layers of the hair follicle's inner root sheath.
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October 1996 in “Development” Hair growth can be stimulated by combining certain skin cells, which can rejuvenate old cells and cause them to specialize in hair follicle creation.
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August 1990 in “PubMed” Keratins K1 and K10 are found in the inner root sheath and cuticle of human hair follicles.
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July 1990 in “PubMed” Human hair follicles can grow and form structures in a collagen gel, useful for studying hair cell growth.
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December 2008 in “Journal of structural biology” Hair curvature in Japanese people is linked to specific cell types and filament arrangements in the hair cortex.
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August 2012 in “Cell Cycle” Stem cells in hair follicles can become neurons and other cells, especially in the upper part, useful for nerve repair.
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March 2001 in “Journal of Investigative Dermatology” A new protein, mK6irs, is found in specific hair layers and may help understand hair growth and diseases.
The inner root sheath in hair follicles plays a key role in hair growth and health.