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GlossaryOrgan Size Control

biological processes regulate growth and final size of organs

Organ Size Control refers to the biological processes that regulate the growth and final size of organs in an organism. This involves a complex interplay of genetic, molecular, and environmental factors that ensure organs grow to the appropriate size for proper function. For example, in hair follicles, organ size control mechanisms ensure that hair grows to a specific length and thickness, which can be disrupted in conditions like alopecia.

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research Roles of Hippo signaling pathway in size control of organ regeneration

37 citations , April 2015 in “Development Growth & Differentiation”

The Hippo signaling pathway helps control organ size during regeneration by regulating gene expression.

research Control of hair growth and follicle size by VEGF-mediated angiogenesis

520 citations , February 2001 in “Journal of Clinical Investigation”

VEGF helps hair grow and determines follicle size by increasing blood vessel growth.

Scalable Production of Controllable Dermal Papilla Spheroids on PVA Surfaces and the Effects of Spheroid Size on Hair Follicle Regeneration

research Scalable production of controllable dermal papilla spheroids on PVA surfaces and the effects of spheroid size on hair follicle regeneration

78 citations , October 2012 in “Biomaterials”

Larger spheroids improve hair growth, but size doesn't guarantee thicker hair.

research 1434 Epithelially derived MPZL3 negatively regulates murine and human sebaceous gland size and sebocyte proliferation

April 2023 in “Journal of Investigative Dermatology”

MPZL3 protein helps control the size of oil glands and the growth of oil-producing cells in both mice and humans.

research Scaffold-based developmental tissue engineering strategies for ectodermal organ regeneration

22 citations , March 2021 in “Materials Today Bio”

Scaffold-based strategies show promise for regenerating hair follicles and teeth but need more research for clinical use.

research Short- and mid-term outcomes of multisystem inflammatory syndrome in children: a longitudinal prospective single-center cohort study

4 citations , August 2023 in “Frontiers in Pediatrics”

Most children with MIS-C showed significant improvement by 6 months.

research The therapeutic promise of apoptosis

9 citations , March 2019 in “Science”

Blocking cell death in certain stem cells can improve wound healing and tissue regeneration.

research Immunohistochemical assessment of SOX10 and its relation to the immune cellular infiltrate in alopecia areata follicles

August 2024 in “Journal of the Egyptian Womenʼs Dermatologic Society”

SOX10 in hair follicles is linked to inflammation in alopecia areata.

research Topical Antiandrogens

11 citations , January 1985 in “Archives of Dermatology”

Topical antiandrogens might treat skin issues like hair growth, balding, and acne, but finding effective treatments without side effects is challenging.

research Reversing wrinkled skin and hair loss in mice by restoring mitochondrial function

74 citations , June 2018 in “Cell death and disease”

Restoring mitochondrial function in mice reversed their skin wrinkling and hair loss.

research The Organizer and Beyond

9 citations , July 2001 in “Cell”

Cells from certain embryo parts can induce head formation in another embryo, involving complex signaling pathways.

research Oxidative Damage Control in a Human (Mini-) Organ: Nrf2 Activation Protects against Oxidative Stress-Induced Hair Growth Inhibition

58 citations , October 2016 in “Journal of Investigative Dermatology”

Activating Nrf2 protects human hair follicles from oxidative stress and helps prevent hair growth inhibition.

research Follicle-innervating Aδ-low threshold mechanoreceptors organize through a population-dependent mechanism

August 2022 in “bioRxiv (Cold Spring Harbor Laboratory)”

Mouse touch-sensitive nerve cells adjust their connections based on competition with other similar cells.

research Local and Systemic Reduction by Topical Finasteride or Flutamide of Hamster Flank Organ Size and Enzyme Activity

37 citations , November 1995 in “Journal of Investigative Dermatology”

Topical finasteride and flutamide reduce gland size and enzyme activity, with flutamide being more potent, potentially treating acne, seborrhea, hirsutism, and androgenic alopecia.

research 872 Dermal Wnt/β-catenin signaling controls hair follicle dermal condensate size during development

April 2017 in “Journal of Investigative Dermatology”

Dermal Wnt/β-catenin signaling is important for the proper size and development of hair follicles.

research The G1/S transition in mammalian stem cells in vivo is autonomously regulated by cell size

1 citations , October 2025 in “Nature Communications”

Cell size controls when stem cells divide.

research Harnessing neuroendocrine controls of keratin expression: A new therapeutic strategy for skin diseases?

26 citations , May 2014 in “BioEssays”

Using neurohormones to control keratin can lead to new skin disease treatments.

research Hair Follicles as Micro-Organs: MicroRNA-Mediated Control of Growth, Cycling, and Fiber Traits

March 2026 in “Biomolecules”

MicroRNAs play a key role in controlling hair growth and quality in sheep and goats.

research Novel C-6 substituted and unsubstituted pregnane derivatives as 5α-reductase inhibitors and their effect on hamster flank organs diameter size

15 citations , May 2009 in “Steroids”

Certain compounds reduced hamster flank organ size by inhibiting 5α-reductase, like finasteride, without affecting androgen receptors.

research Androgen regulation of a specific gene in hamster flank organs

12 citations , January 1991 in “Archives of dermatological research”

Male hormones control a specific gene in hamster skin, with different hormones having varying effects.

research COX2-ATP Synthase Regulates Spine Follicle Size in Hedgehogs

January 2023 in “International journal of biological sciences”

COX2 and ATP synthase control the size of hedgehog spines.

research Morpho-Regulation of Ectodermal Organs

131 citations , March 2004 in “The American journal of pathology”

Modulating BMP activity changes the number, size, shape, and type of ectodermal organs.

research The promoter of an androgen dependent gene in the hamster flank organ

6 citations , May 1997 in “Journal of Dermatological Science”

Researchers found a gene in hamsters that responds to male hormones and may be indirectly controlled by them.

research Sostdc1 defines the size and number of skin appendage placodes

56 citations , February 2012 in “Developmental biology”

Sostdc1 controls the size and number of hair and mammary gland structures.

research Hair follicle-targeting drug delivery strategies for the management of hair follicle-associated disorders

14 citations , May 2022 in “Asian Journal of Pharmaceutical Sciences”

New hair follicle-targeting treatments show promise for hair disorders but need more research on safety and effectiveness.

research The impact of a lifestyle promotion program on anthropometric and clinical manifestations in adolescents with polycystic ovarian syndrome: a randomized controlled trial

6 citations , December 2024 in “BMC Women s Health”

Lifestyle changes improve weight, waist size, menstrual regularity, and acne in teens with PCOS.