Related Experiment Video
Updated: Jul 4, 2025
12:37
Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model
Published on: September 7, 2013
18.2K
Redefine photoprotection: Sun protection beyond sunburn
Mirja van Bodegraven1, Marius Kröger2, Daniela F Zamudio Díaz2
1Research and Development, Beiersdorf AG, Hamburg, Germany.
Experimental Dermatology
|January 29, 2024
Summary
Higher sun protection factor (SPF) sunscreens offer superior protection against ultraviolet (UV) damage. SPF100 significantly reduces DNA damage and preserves skin immune function compared to SPF30, benefiting vulnerable individuals.
Area of Science:
- Dermatology
- Photobiology
- Cancer Prevention
Background:
- Excessive ultraviolet (UV) light exposure is a primary cause of skin damage and cancer.
- Sunscreens are widely used for sunburn prevention and skin cancer programs.
- Concerns exist regarding the efficacy of high sun protection factor (SPF) values against sub-erythema UV damage.
Purpose of the Study:
- To evaluate the protective effects of different SPF levels against UV-induced DNA damage and immune suppression.
- To compare the efficacy of SPF30 versus SPF100 in preventing cellular damage and maintaining skin immune function.
Main Methods:
- Ex vivo human skin studies assessing DNA damage reduction.
- Cell culture assays analyzing IL-18 levels, cell vitality, and cis/trans-urocanic acid.
- Evaluation of UV damage at levels significantly below one minimal erythema dose (MED).
Main Results:
- SPF30 reduced UV-induced DNA damage by approximately 53% over 24 MED.
- SPF100 demonstrated superior protection, reducing DNA damage by approximately 73%.
- SPF100 also showed enhanced preservation of cutaneous immunosurveillance and cell vitality compared to lower SPFs.
Conclusions:
- While SPF30 and SPF50+ offer substantial UVB protection, SPF100 provides significant additional benefits.
- SPF100 is particularly recommended for vulnerable groups, including immunosuppressed and cancer patients.
- Higher SPF values are crucial for comprehensive protection against mutagenic DNA damage and immune impairment.
Related Concept Videos
01:35Mutations
37.5K
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
37.5K
01:38Nucleotide Excision Repair
3.5K
DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
3.5K
01:22Photoreceptors and Visual Pathways
6.0K
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
6.0K
02:00Photoreceptors and Plant Responses to Light
20.3K
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
20.3K
01:22Burn Injuries
2.5K
Burn injuries occur when the skin and underlying tissues are damaged due to exposure to heat, electricity, chemicals, radiation, or friction. They can vary in severity, from minor superficial burns to severe deep burns that can be life-threatening.
The damage results in the death of skin cells, which can lead to a massive loss of fluid. Dehydration, electrolyte imbalance, and renal and circulatory failure follow, which can be fatal. Burn patients are treated with intravenous fluids to offset...
The damage results in the death of skin cells, which can lead to a massive loss of fluid. Dehydration, electrolyte imbalance, and renal and circulatory failure follow, which can be fatal. Burn patients are treated with intravenous fluids to offset...
2.5K
01:30Skin Cancer
4.1K
Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
Basal Cell Carcinoma (BCC): BCC is the most common type of skin cancer, accounting for about 80% of cases. It typically develops in...
Basal Cell Carcinoma (BCC): BCC is the most common type of skin cancer, accounting for about 80% of cases. It typically develops in...
4.1K