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Lipidome of narrow‐band ultraviolet B irradiated keratinocytes shows apoptotic hallmarks
Author(s) -
Reich Adam,
Schwudke Dominik,
Meurer Michael,
Lehmann Bodo,
Shevchenko Andrej
Publication year - 2010
Publication title -
experimental dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.108
H-Index - 96
eISSN - 1600-0625
pISSN - 0906-6705
DOI - 10.1111/j.1600-0625.2009.01000.x
Subject(s) - lipidome , ultraviolet b , apoptosis , ultraviolet , ultraviolet radiation , ultraviolet irradiation , irradiation , chemistry , ultraviolet a , microbiology and biotechnology , cancer research , biology , medicine , dermatology , materials science , physics , optoelectronics , lipidomics , biochemistry , nuclear physics , radiochemistry
Please cite this paper as: Lipidome of narrow‐band ultraviolet B irradiated keratinocytes shows apoptotic hallmarks. Experimental Dermatology 2010; 19 : e103–e110. Abstract Background: UV light triggers a variety of biological responses in irradiated keratinocytes that might be associated with global perturbation of their lipidome. However, lipids that are specifically affected and the exact molecular mechanisms involved remain poorly understood. Objectives: To characterize time‐dependent changes of the lipidome of cultured keratinocytes induced by narrow‐band ultraviolet B (NB‐UVB) irradiation. Methods: Immortalized human keratinocytes (HaCaT) were cultured under standard conditions, irradiated with NB‐UVB light (311 nm) at 400 and 800 mJ/cm 2 and collected 1, 2, 3, 6, 12 and 24 h later for lipid extraction. Lipid extracts were separated on silica plates in chloroform/ethanol/water/triethylamine (35:40:9:35) and in n ‐hexane/ethylacetate (5:1) followed by quantitative shotgun lipidomics analysis. Results: Irradiation with 800 mJ/cm 2 of NB‐UVB altered morphology and lipidome composition of HaCaT cells. Ceramide content increased two‐fold 6‐ and 12‐h postirradiation with 800 mJ/cm 2 , followed by threefold increase in triacylglycerols (TAGs) that peaked at 24 h. In addition, we observed marked increase of various phosphatidylcholine and phosphatidylethanolamine ethers, whereas phosphatidylcholine‐species with short‐chain fatty acid moieties decreased. The abundance of other lipid species was altered to lesser extent or remained unchanged. Conclusions: NB‐UVB affected the cellular lipidome of keratinocytes in strictly apoptosis‐specific manner.