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Related Concept Videos

Pigmentation01:19

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...

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Related Experiment Video

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Quantifying Abdominal Pigmentation in Drosophila melanogaster
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Method for quantifying cutaneous pigmentation in animals and preliminary study in humans.

F Merot1, R Seniuta, G Benita

  • 1Evic Ceba, 33295 Blanquefort Cedex, France.

International Journal of Cosmetic Science
|March 11, 2009
PubMed
Summary

Human skin depigmentation studies require larger groups and longer trials than animal models. Results in black mice using hydroquinone did not significantly translate to human efficacy.

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Area of Science:

  • Dermatology
  • Cosmetic Science
  • Pharmacology

Background:

  • Increasing demand for safe depigmenting products in African and Asian populations due to aesthetic and social factors.
  • Traditional reliance on animal models, specifically the black mouse (CS BL/6/JICO), for depigmenting product research.
  • Need to adapt methodologies to account for human skin's unique characteristics for accurate efficacy testing.

Purpose of the Study:

  • To compare the efficacy of a depigmenting agent between an established animal model and a newly adapted human skin model.
  • To evaluate the effectiveness of a cosmetic preparation containing 2% hydroquinone delivered via an absorption-enhancing vector.
  • To assess the translatability of animal study findings to human subjects.

Main Methods:

  • Initial depigmentation study conducted on the black mouse (CS BL/6/JICO) model.
  • Adaptation of the methodology to incorporate specific characteristics of human skin for in-human studies.
  • Comparative testing of a 2% hydroquinone cosmetic preparation between the mouse and human models.

Main Results:

  • Depigmentation effects observed in the animal model were not statistically significant in human subjects.
  • Significant differences were noted between the animal and human models regarding the tested depigmenting agent.
  • The study highlighted the variability and complexity of human skin responses.

Conclusions:

  • Animal models may not accurately predict the efficacy of depigmenting agents on human skin.
  • Human skin depigmentation studies necessitate larger participant cohorts and extended treatment durations for statistically significant results.
  • Further research is required to develop reliable human-centric models for evaluating cosmetic depigmenting products.