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Published 23 June 2003. doi:10.1083/jcb.200207080
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© The Rockefeller University Press, 0021-9525/2003/6/1105 $5.00
The Journal of Cell Biology, Volume 161, Number 6, 1105-1115


Article

Mice with targeted disruption of the fatty acid transport protein 4 (Fatp 4, Slc27a4) gene show features of lethal restrictive dermopathy



Thomas Herrmann1, Frank van der Hoeven2, Hermann-Josef Gröne3, Adrian Francis Stewart5, Lutz Langbein4, Iris Kaiser1, Gerhard Liebisch6, Isabella Gosch1, Florian Buchkremer1, Wolfgang Drobnik6, Gerd Schmitz6 and Wolfgang Stremmel1

1 Department of Internal Medicine IV, University of Heidelberg, 69115 Heidelberg, Germany
2 Transgenic Core Facility, German Cancer Research Center, 69120 Heidelberg, Germany
3 Department of Cellular and Molecular Pathology, German Cancer Research Center, 69120 Heidelberg, Germany
4 Department of Cell Biology, German Cancer Research Center, 69120 Heidelberg, Germany
5 Biotec, Technical University of Dresden, 01307 Dresden, Germany
6 Institute of Clinical Chemistry, University of Regensburg, 93042 Regensburg, Germany

Address correspondence to Wolfgang Stremmel, Dept. of Internal Medicine IV, University of Heidelberg, Bergheimer Str. 58, 69115 Heidelberg, Germany. Tel.: 49-62-21-56-87-00. Fax: 49-62-21-56-41-16. E-mail: wolfgang_stremmel{at}med.uni-heidelberg.de

The fatty acid transport protein family is a group of evolutionarily conserved proteins that are involved in the cellular uptake and metabolism of long and very long chain fatty acids. However, little is known about their respective physiological roles. To analyze the functional significance of fatty acid transport protein 4 (Fatp4, Slc27a4), we generated mice with a targeted disruption of the Fatp4 gene. Fatp4-null mice displayed features of a neonatally lethal restrictive dermopathy. Their skin was characterized by hyperproliferative hyperkeratosis with a disturbed epidermal barrier, a flat dermal–epidermal junction, a reduced number of pilo-sebaceous structures, and a compact dermis. The rigid skin consistency resulted in an altered body shape with facial dysmorphia, generalized joint flexion contractures, and impaired movement including suckling and breathing deficiencies. Lipid analysis demonstrated a disturbed fatty acid composition of epidermal ceramides, in particular a decrease in the C26:0 and C26:0-OH fatty acid substitutes. These findings reveal a previously unknown, essential function of Fatp4 in the formation of the epidermal barrier.

Key Words: ceramides; epidermis; Fatp4; fatty acid metabolism; fatty acid transport


* Abbreviations used in this paper: CER, ceramide; ESI-MS/MS, electrospray ionization tandem mass spectrometry; Fatp, fatty acid transport protein; FC, cholesterol; PC, phosphatidylcholine; PE, phosphatidylethanolamine; PS, phosphatidylserine; SPM, sphingomyelin; TEWL, transepidermal water loss; X-gal, 5-bromo-4-chloro-3-indolyl-ß-D-galactopyranoside.


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