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Updated: Apr 25, 2026
Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model
Published on: September 7, 2013
Adipose-derived stem cells inhibit epidermal melanocytes through an interleukin-6-mediated mechanism
Deok-Woo Kim1, Byung-Joon Jeon, Na-Hyun Hwang
1Seoul, Republic of Korea From the Department of Plastic and Reconstructive Surgery, Korea University Medical Center.
Background:
Several investigators have postulated that human adipose-derived stem cells can be used for skin rejuvenation, but there have been few reports about their direct effects on human epidermal melanocytes. The authors studied the effects on melanocytes, and the causative agent of those effects was further investigated in this study.
Methods:
Human epidermal melanocytes were divided into three groups and cultured in adipose-derived stem cell-conditioned medium, human dermal fibroblast-conditioned medium, or control medium. Concentrations of melanogenic cytokines in these media were measured using enzyme-linked immunosorbent assay kits. After 3 and 7 days of incubation, cell proliferation, melanin content, tyrosinase activity, and melanogenic gene expression were measured. Interleukin-6-neutralizing antibodies were mixed with adipose-derived stem cell-conditioned medium in which human epidermal melanocytes were cultured, and melanocyte growth and melanogenesis were measured again.
Results:
Interleukin-6 concentrations in adipose-derived stem cell- and human epidermal melanocyte-conditioned media were 1373 and 495 pg/ml, respectively. Both types of medium suppressed melanocyte proliferation and melanin synthesis (p < 0.05), but adipose-derived stem cell-conditioned medium was more effective than human dermal fibroblast-conditioned medium in inhibition of human epidermal melanocyte proliferation, melanin synthesis, and tyrosinase activity (p < 0.05). Interleukin-6-neutralizing antibody sufficiently reversed the antimelanogenic effects of adipose-derived stem cell-conditioned medium such that human epidermal melanocyte proliferation, melanin content, tyrosinase activity, and tyrosinase mRNA levels were restored (p < 0.05).
Conclusions:
Adipose-derived stem cell-conditioned medium inhibited melanocyte proliferation and melanin synthesis by down-regulating melanogenic enzymes. Interleukin-6 plays a pivotal role in inhibition of melanocytes.
Insights
Adipose-derived stem cell medium inhibits melanocyte proliferation and melanin synthesis. Interleukin-6 is the key factor responsible for these antimelanogenic effects, impacting skin rejuvenation potential.
Area of Science:
- Biomedical research
- Dermatology
- Stem cell biology
Background:
- Human adipose-derived stem cells (ADSCs) are explored for skin rejuvenation.
- Limited data exists on ADSC effects on human epidermal melanocytes.
- This study investigates ADSC-conditioned medium's impact on melanocytes and identifies the active agent.
Purpose of the Study:
- To determine the effect of ADSC-conditioned medium on human epidermal melanocyte proliferation and melanogenesis.
- To investigate the role of Interleukin-6 (IL-6) in mediating these effects.
Main Methods:
- Human epidermal melanocytes were cultured in ADSC-conditioned medium, fibroblast-conditioned medium, or control medium.
- Melanogenic cytokine levels, cell proliferation, melanin content, tyrosinase activity, and gene expression were assessed.
- The effect of IL-6 neutralizing antibodies on ADSC-conditioned medium was evaluated.
Main Results:
- ADSC-conditioned medium significantly suppressed melanocyte proliferation and melanin synthesis compared to control and fibroblast-conditioned medium.
- IL-6 concentrations were higher in ADSC-conditioned medium.
- Neutralization of IL-6 reversed the inhibitory effects of ADSC-conditioned medium on melanocytes.
Conclusions:
- ADSC-conditioned medium inhibits melanocyte proliferation and melanin synthesis by down-regulating melanogenic enzymes.
- Interleukin-6 is a critical mediator of these antimelanogenic effects.
- ADSCs may influence skin pigmentation through IL-6 secretion.
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