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GlossaryHair Follicle Cells

specialized cells responsible for hair growth and regeneration

Hair follicle cells, also known as follicular cells, are specialized cells located within the hair follicle, the skin structure responsible for hair growth. These cells play a crucial role in the hair growth cycle, including the phases of growth (anagen), regression (catagen), and rest (telogen). They are involved in the production of keratin, the protein that makes up hair, and are essential for the regeneration and repair of hair.

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Acidic and Basic Hair/Nail (Hard) Keratins: Their Colocalization in Upper Cortical and Cuticle Cells of the Human Hair Follicle and Their Relationship to Soft Keratins

research Acidic and basic hair/nail ("hard") keratins: their colocalization in upper cortical and cuticle cells of the human hair follicle and their relationship to "soft" keratins.

356 citations , December 1986 in “The journal of cell biology/The Journal of cell biology”

Hair and nail cells share similar proteins, indicating a common differentiation pathway.

research In vitro Growth and Differentiation of Epithelial Cells derived from Post-embryonic Hair Follicles

7 citations , February 1982 in “Australian Journal of Biological Sciences”

Epithelial cells from young rat hair follicles grow and form aggregates in culture, but don't produce hair keratin proteins.

research Hair follicle differentiation: expression, structure and evolutionary conservation of the hair type II keratin intermediate filament gene family

65 citations , February 1992 in “Development”

Type II keratin genes are crucial for hair follicle differentiation and have a conserved structure and expression pattern.

research Gene Expression of Mouse S100A3, a Cysteine-Rich Calcium-Binding Protein, in Developing Hair Follicle

40 citations , November 1998 in “The journal of investigative dermatology/Journal of investigative dermatology”

S100A3 protein is crucial for hair shaft formation in mice.

research Expression pattern of human hair keratin basic 1 (hHbl) in hair follicle and pilomatricoma

8 citations , April 1997 in “Experimental Dermatology”

hHbl gene is active in hair shaft cells and some pilomatricomas.

research Isolation and Characterization of a Novel Hair Follicle–Specific Gene, Hacl-1

25 citations , May 1994 in “Journal of Investigative Dermatology”

Researchers found a new gene, hacl-1, that is active in mouse hair follicles during hair growth and may be important for hair biology.

research The structure of hair and follicles of mice carrying the naked (N) gene

21 citations , April 1982 in “Genetics Research”

Mice with the naked gene have missing or abnormal hair cells.

research Transforming growth factor-alpha immunoreactivity during induced hair follicle growth cycles in sheep and ferrets.

6 citations , April 1996 in “Journal of histochemistry and cytochemistry/The journal of histochemistry and cytochemistry”

TGF-alpha is present in sheep and ferret skin and may affect hair growth without directly stimulating cell proliferation.

research Prenatal transplantation of epidermal neural crest stem cells in malformation of cortical development mouse model

5 citations , December 2016 in “Microscopy Research and Technique”

EPI-NCSCs from hair follicles may help treat brain development issues in mice.

research Hair curvature: a natural dialectic and review

28 citations , March 2014 in “Biological reviews/Biological reviews of the Cambridge Philosophical Society”

The document concludes that hair curvature can be explained by the growth patterns caused by the shape and separation of cells in the hair follicle and is affected by specific molecular pathways.

research Biology of Human Hair Growth and Common Baldness.

January 1998 in “KAGAKU TO SEIBUTSU”

The document suggests that male hormones likely affect hair growth and baldness, and future treatments might involve stem cells and androgen-independent cells.

P63 Targeted Deletion Under the FOXN1 Promoter Disrupts Pre- and Post-Natal Thymus Development, Function, and Maintenance, and Induces Severe Hair Loss

research P63 targeted deletion under the FOXN1 promoter disrupts pre-and post-natal thymus development, function and maintenance as well as induces severe hair loss

5 citations , January 2022 in “PloS one”

Deleting the p63 gene in certain cells causes problems in thymus development and severe hair loss in mice.

research Sequences and differential expression of three novel human type-II hair keratins

61 citations , February 1997 in “Differentiation”

Hair differentiation starts earlier than thought, involving multiple type-II keratins.

research Morphology and Properties of Hair

3 citations , December 2018 in “Routledge eBooks”

Hair is made of strong keratin fibers that protect against the environment.

research Ultrastructural Characteristics of Neonate Scalp Hair

July 2016 in “Indian journal of science and technology”

Neonate scalp hair is thinner, lacks a medulla, and has smaller follicles compared to adult hair.

Oxytocin Receptor Expression in Hair Follicle Stem Cells: A Promising Model for Biological and Therapeutic Discovery in Neuropsychiatric Disorders

research OXYTOCIN RECEPTOR EXPRESSION IN HAIR FOLLICLE STEM CELLS: A PROMISING MODEL FOR BIOLOGICAL AND THERAPEUTIC DISCOVERY IN NEUROPSYCHIATRIC DISORDERS

October 2023 in “IBRO neuroscience reports”

Rat hair follicle stem cells have functional oxytocin receptors, useful for studying neuropsychiatric disorders.

research Multimodal imaging of hair follicle bulge-derived stem cells in a mouse model of traumatic brain injury

4 citations , February 2020 in “Cell & tissue research/Cell and tissue research”

Hair follicle stem cells might help treat traumatic brain injury.

research Immunolocalization of typeIII collagen in normal and recovering traumatic skins of guinea pigs

January 1993 in “Di-Si Junyi Daxue xuebao”

Type III collagen increases in recovering guinea pig skin, aiding tissue stability.

research Isolation and Characterization of Mouse High-glycine/Tyrosine Proteins

24 citations , November 1997 in “Journal of Biological Chemistry”

Mouse high-glycine/tyrosine proteins have distinct patterns in hair follicles, peaking at specific hair cycle days.

research Histological Study for Skin of Horse

February 2023 in “Mağallaẗ Tikrīt li-l-ʻulūm al-ṣirfaẗ/Tikrit journal of pure science”

Horse skin has a layered epidermis, a dermis with hair follicles, sweat and sebaceous glands, and is supplied by small arteries.

research Regulation of Keratin Gene Expression in Hair Follicle Differentiation^a

98 citations , December 1991 in “Annals of the New York Academy of Sciences”

Keratin gene regulation is similar across mammals, affecting hair follicle differentiation.

Characterization and Chromosomal Localization of Human Hair-Specific Keratin Genes and Comparative Expression During the Hair Growth Cycle

research Characterization and Chromosomal Localization of Human Hair-Specific Keratin Genes and Comparative Expression During the Hair Growth Cycle

32 citations , February 1998 in “The journal of investigative dermatology/Journal of investigative dermatology”

Two specific hair keratin genes are active during hair growth and decline as hair transitions to rest.

research Hair structure anatomy and comparative anatomy1 1Dedicated to the memory of the late Dr. R. E. Rivett whose untimely death prevented his role in co-authorship.

50 citations , March 2001 in “Clinics in dermatology”

Human hair is complex and grows in cycles starting from embryonic life.

research In brief

2 citations , November 2006 in “Pump Industry Analyst”

Pilomatricomas don't follow the usual hair follicle cell differentiation process.

research Decision letter: NuMA-microtubule interactions are critical for spindle orientation and the morphogenesis of diverse epidermal structures

December 2015

NuMA-microtubule interactions are vital for proper skin structure formation and function.

research Faculty Opinions recommendation of The keratins of the human beard hair medulla: the riddle in the middle.

March 2010 in “Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature”

Beard hair medulla cells have a unique and varied keratin pattern.

research An approach to disorders of pigmentation

September 2012 in “British Small Animal Veterinary Association eBooks”

The document concludes that pigmentation disorders in animals involve complex interactions between melanocytes and keratinocytes.

research Characterization of LHTric-1, a new monospecific monoclonal antibody to the trichocyte keratin Ha1

19 citations , July 1997 in “British Journal of Dermatology”

LHTric-1 is a specific antibody useful for studying hair and nail formation.

Characterization of Cell Cycle Arrest and Terminal Differentiation in a Maximally Proliferative Human Epithelial Tissue: Lessons from the Human Hair Follicle Matrix

research Characterisation of cell cycle arrest and terminal differentiation in a maximally proliferative human epithelial tissue: Lessons from the human hair follicle matrix

30 citations , April 2017 in “European Journal of Cell Biology”

CIP/KIP proteins help stop cell division and support hair growth.

Structural Features of the Alpha-Type Filaments of the Inner Root Sheath Cells of the Guinea Pig Hair Follicle

research Structural features of the α-type filaments of the inner root sheath cells of the guinea pig hair follicle

24 citations , November 1978 in “Biochemistry”

α-type filaments in guinea pig hair follicles have unique structural features.