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GlossaryCatagen Phase

hair growth stops and follicles shrink, lasting about 2-3 weeks

The Catagen Phase, also known as the Transitional Phase, is a short period in the hair growth cycle that lasts about 2-3 weeks. During this phase, hair growth stops, and the hair follicle shrinks and detaches from the dermal papilla, effectively transitioning the hair from the growth phase (Anagen) to the resting phase (Telogen). This phase is crucial for the renewal of hair follicles and the overall hair growth process.

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research Thrombospondin-1 Plays a Critical Role in the Induction of Hair Follicle Involution and Vascular Regression During the Catagen Phase

52 citations , January 2003 in “Journal of Investigative Dermatology”

Thrombospondin-1 is crucial for hair follicle regression and reduced blood vessel growth during the catagen phase.

research Lipid peroxides induce early onset of catagen phase in murine hair cycles

49 citations , January 1998 in “International Journal of Molecular Medicine”

Lipid peroxides can cause early hair loss by damaging hair follicles.

research Expression of Cyclooxygenase Isozymes During Morphogenesis and Cycling of Pelage Hair Follicles in Mouse Skin: Precocious Onset of the First Catagen Phase and Alopecia upon Cyclooxygenase-2 Overexpression

41 citations , September 2003 in “Journal of Investigative Dermatology”

Overexpression of COX-2 causes early hair loss in mice, but can be prevented with a COX-2 inhibitor.

research Identification of microRNAs in Wool Follicles during Anagen, Catagen, and Telogen Phases in Tibetan Sheep

37 citations , October 2013 in “PLoS ONE”

MicroRNAs play a key role in wool growth in Tibetan sheep.

Ginsenoside Re Prevents 3-Methyladenine-Induced Catagen Phase Acceleration by Regulating Wnt/Beta-Catenin Signaling in Human Dermal Papilla Cells

research Ginsenoside Re prevents 3-methyladenine-induced catagen phase acceleration by regulating Wnt/β-catenin signaling in human dermal papilla cells

5 citations , November 2022 in “Journal of Ginseng Research/Journal of ginseng research”

Ginsenoside Re from Panax ginseng may prevent hair loss by maintaining autophagy and Wnt signaling in hair cells.

research 1428 DKK2 and SOSTDC1 cooperate to initiate the first catagen phase of the hair follicle growth cycle

April 2023 in “The journal of investigative dermatology/Journal of investigative dermatology”

DKK2 and SOSTDC1 together are necessary for the normal timing of the first regression phase in the hair growth cycle.

research Epidermal growth factor induced apoptosis in the outer root sheath cells of anagen hair and changed the hair cycle to the catagen phase

September 2004 in “Kitasato medical journal”

Epidermal growth factor causes hair loss by triggering cell death and changing the hair cycle.

research Melanogenesis During the Anagen-Catagen-Telogen Transformation of the Murine Hair Cycle

161 citations , June 1994 in “The journal of investigative dermatology/Journal of investigative dermatology”

Hair stops producing melanin as it transitions from the growth phase to the resting phase.

A Murine Model for Inducing and Manipulating Hair Follicle Regression: Effects of Dexamethasone and Cyclosporin A

research A Murine Model for Inducing and Manipulating Hair Follicle Regression (Catagen): Effects of Dexamethasone and Cyclosporin A

124 citations , August 1994 in “Journal of Investigative Dermatology”

Dexamethasone speeds up hair loss in mice, while cyclosporin A slows it down.

Prolactin and Its Receptor Are Expressed in Murine Hair Follicle Epithelium, Show Hair Cycle-Dependent Expression, and Induce Catagen

research Prolactin and Its Receptor Are Expressed in Murine Hair Follicle Epithelium, Show Hair Cycle-Dependent Expression, and Induce Catagen

91 citations , May 2003 in “American Journal of Pathology”

Prolactin affects hair growth cycles and can cause early hair follicle regression.

research Outer root sheath keratinization in anagen and catagen of the mammalian hair follicle. A seventh distinct type of keratinization in the hair follicle: trichilemmal keratinization.

59 citations , August 1981 in “PubMed”

Trichilemmal keratinization is a unique process in hair follicles where the outer root sheath turns into keratin without a specific layer.

research Immunohistochemical analysis of tissue remodelling during the anagen-catagen transition of the human hair follicle

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

The inner root sheath is crucial for hair follicle stability during the transition from growth to involution.

research Estrogen Leads to Reversible Hair Cycle Retardation through Inducing Premature Catagen and Maintaining Telogen

42 citations , July 2012 in “PLOS ONE”

Estrogen can temporarily slow down hair growth but this can be reversed.

research Changes in Different Melanocyte Populations During Hair Follicle Involution (Catagen)

40 citations , November 2005 in “The journal of investigative dermatology/Journal of investigative dermatology”

Different melanocyte types in hair follicles either survive or die during the catagen phase.

research Expression ofSfrp2Is Increased in Catagen of Hair Follicles and Inhibits Keratinocyte Proliferation

25 citations , January 2014 in “Annals of Dermatology”

Sfrp2 increases during hair follicle catagen phase and slows keratinocyte growth.

research Roles of GasderminA3 in Catagen–Telogen Transition During Hair Cycling

25 citations , April 2015 in “Journal of Investigative Dermatology”

GasderminA3 is important for normal hair cycle transitions by controlling Wnt signaling.

research Immunohistochemical analysis of tissue remodelling during the anagen—catagen transition of the human hair follicle

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

The inner root sheath is vital for hair follicle stability during growth changes.

research Igf1r signalling acts on the anagen‐to‐catagen transition in the hair cycle

20 citations , January 2017 in “Experimental Dermatology”

Igf1r helps regulate hair growth cycles.

Protective Effect of Korean Red Ginseng Against Chemotherapeutic Drug-Induced Premature Catagen Development Assessed With Human Hair Follicle Organ Culture Model

research Protective effect of Korean Red Ginseng against chemotherapeutic drug-induced premature catagen development assessed with human hair follicle organ culture model

19 citations , July 2015 in “Journal of Ginseng Research”

Korean Red Ginseng may protect against hair loss caused by chemotherapy.

research Catagen in the hairless house mouse

17 citations , November 1967 in “American Journal of Anatomy”

Hairless mice have longer hair follicles and abnormal structures during the catagen phase.

Novel ALK5 Inhibitor TP0427736 Reduces TGF-β Induced Growth Inhibition in Human Outer Root Sheath Cells and Elongates Anagen Phase in Mouse Hair Follicles

research Novel ALK5 inhibitor TP0427736 reduces TGF-β induced growth inhibition in human outer root sheath cells and elongates anagen phase in mouse hair follicles

14 citations , January 2017 in “Pharmacological Reports”

TP0427736 may help treat hair loss by blocking a specific protein and promoting hair growth.

research HNG, A Humanin Analogue, Promotes Hair Growth by Inhibiting Anagen-to-Catagen Transition

13 citations , June 2020 in “International Journal of Molecular Sciences”

HNG helps hair grow by keeping hair in the growth phase longer.

Mycophenolate Antagonizes IFN-γ-Induced Catagen-Like Changes via β-Catenin Activation in Human Dermal Papilla Cells and Hair Follicles

research Mycophenolate Antagonizes IFN-γ-Induced Catagen-Like Changes via β-Catenin Activation in Human Dermal Papilla Cells and Hair Follicles

11 citations , September 2014 in “International Journal of Molecular Sciences”

Mycophenolate helps reverse hair loss effects caused by IFN-γ by activating a key hair growth pathway.

research Adenosine Promotes Human Hair Growth and Inhibits Catagen Transition In Vitro: Role of the Outer Root Sheath Keratinocytes

3 citations , November 2019 in “Journal of Investigative Dermatology”

Adenosine helps human hair grow and prevents hair loss by targeting specific cells.

research Characterization of Hair Follicles in Hirosaki Hairless Rats with Deletion of Basic Hair Keratin Genes. Enlarged Medulla, Loss of Cuticle and Long Catagen

3 citations , March 2009 in “Hirosaki University Repository for Academic Resources (Hirosaki University)”

Hirosaki hairless rats have sparse, twisted hair due to missing hair keratin genes.

research A topical botanical lotion increases and remodels scalp collagen content through longer anagen phase, opening new perspectives

April 2016 in “Journal of The American Academy of Dermatology”

A botanical lotion can increase scalp collagen and extend hair growth phase, potentially improving hair thinning issues.