Long-wave ultraviolet light induces phospholipase activation in cultured human epidermal keratinocytes

Journal Article · Wed Aug 01 00:00:00 EDT 1990 · Journal of Investigative Dermatology; (USA)

DOI:https://doi.org/10.1111/1523-1747.ep12477928· OSTI ID:6523728

Hanson, D; DeLeo, V ^[1]

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1. Columbia Univ., New York, NY (USA)

Long wave ultraviolet radiation (UVA) has been shown to play an important role in the overall response of skin to solar radiation, including sunburn, tanning, premature aging, and non-melanoma skin cancer. UVA induction of inflammation in human skin is thought to be mediated by membrane lipid derived products. In order to investigate the mechanism of this response we examined the effect of UVA on phospholipid metabolism of human epidermal keratinocytes in culture. Keratinocytes were grown in serum free low calcium medium. The cells were prelabeled with (3H) arachidonic acid or (3H) choline and irradiated with UVA (Honle 2002-Hg vapor lamp). Identification and quantitation of specific membrane phospholipid-derived components was achieved using high-performance liquid chromatography, paper chromatography, and radioimmunoassay. UVA resulted in a linear dose dependent release of (3H) arachidonic acid into medium between 1 and 20 joule/cm2. This response was inhibited in an oxygen-reduced environment. The radiolabel released was predominantly free arachidonate and cyclooxygenase metabolites. Cyclooxygenase metabolites prostaglandin E2 and prostacyclin derivative, 6-keto-prostaglandin F1a, were stimulated following UVA irradiation, but the lipoxygenase metabolite, leukotriene B was not detected. Maximal release was measured immediately after irradiation and changed little over 24 h post-irradiation. UVA stimulated an increase of (3H) choline metabolites glycerophosphorylcholine and phosphorylcholine in media extracts suggesting UVA activation of phospholipase C and phospholipase A2 or diacylglyceride lipase.

• OSTI ID: 6523728
• Journal Information: Journal of Investigative Dermatology; (USA), Vol. 95:2; ISSN 0022-202X
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
59 BASIC BIOLOGICAL SCIENCES
ANIMAL CELLS
BIOLOGICAL RADIATION EFFECTS
LIPASES
ENZYME ACTIVITY
PHOSPHOLIPIDS
METABOLISM
ARACHIDONIC ACID
CELL CULTURES
CHOLINE
DOSE-RESPONSE RELATIONSHIPS
EPIDERMIS
KERATIN
LIQUID COLUMN CHROMATOGRAPHY
MAN
METABOLITES
PROSTAGLANDINS
RADIOIMMUNOASSAY
TRITIUM COMPOUNDS
ULTRAVIOLET RADIATION
ALCOHOLS
AMINES
AMMONIUM COMPOUNDS
ANIMAL TISSUES
ANIMALS
BIOASSAY
BIOLOGICAL EFFECTS
BODY
CARBOXYLESTERASES
CARBOXYLIC ACIDS
CHROMATOGRAPHY
DIAGNOSTIC TECHNIQUES
DRUGS
ELECTROMAGNETIC RADIATION
ENZYMES
EPITHELIUM
ESTERASES
ESTERS
HYDROGEN COMPOUNDS
HYDROLASES
HYDROXY COMPOUNDS
IMMUNOASSAY
IMMUNOLOGY
ISOTOPE APPLICATIONS
LIPIDS
LIPOTROPIC FACTORS
MAMMALS
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
ORGANS
PRIMATES
PROTEINS
QUATERNARY COMPOUNDS
RADIATION EFFECTS
RADIATIONS
RADIOASSAY
RADIOIMMUNODETECTION
RADIOIMMUNOLOGY
SCLEROPROTEINS
SEPARATION PROCESSES
SKIN
TISSUES
TRACER TECHNIQUES
VERTEBRATES
560120* - Radiation Effects on Biochemicals
Cells
& Tissue Culture
550901 - Pathology- Tracer Techniques