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Geranylgeranyltransferase type I (GGTase-I) deficiency hyperactivates macrophages and induces erosive arthritis in mice.

Journal article
Authors Omar M. Khan
Mohamed X Ibrahim
Ing-Marie Jonsson
Christin Karlsson
Meng Liu
Anna-Karin Sjögren
Frida J Olofsson
Mikael Brisslert
Sofia E M Andersson
Claes Ohlsson
Lillemor Mattsson Hultén
Maria Bokarewa
Martin Bergö
Published in The Journal of clinical investigation
Volume 121
Issue 2
Pages 628-39
ISSN 1558-8238
Publication year 2011
Published at Wallenberg Laboratory
Institute of Medicine, Department of Rheumatology and Inflammation Research
Institute of Medicine
Institute of Medicine, Department of Internal Medicine
Pages 628-39
Language en
Links dx.doi.org/10.1172/JCI43758
Keywords Alkyl and Aryl Transferases, deficiency, genetics, Animals, Arthritis, immunology, pathology, Cytokines, immunology, Macrophages, cytology, enzymology, immunology, physiology, Mice, Mice, Inbred C57BL, Mice, Knockout, cdc42 GTP-Binding Protein, genetics, metabolism, rac1 GTP-Binding Protein, genetics, metabolism, rap1 GTP-Binding Proteins, genetics, metabolism, rhoA GTP-Binding Protein, genetics, metabolism
Subject categories Cell biology, Medical cell biology

Abstract

RHO family proteins are important for the function of inflammatory cells. They are modified with a 20-carbon geranylgeranyl lipid in a process catalyzed by protein geranylgeranyltransferase type I (GGTase-I). Geranylgeranylation is viewed as essential for the membrane targeting and activity of RHO proteins. Consequently, inhibiting GGTase-I to interfere with RHO protein activity has been proposed as a strategy to treat inflammatory disorders. However, here we show that mice lacking GGTase-I in macrophages develop severe joint inflammation resembling erosive rheumatoid arthritis. The disease was initiated by the GGTase-I-deficient macrophages and was transplantable and reversible in bone marrow transplantation experiments. The cells accumulated high levels of active GTP-bound RAC1, CDC42, and RHOA, and RAC1 remained associated with the plasma membrane. Moreover, GGTase-I deficiency activated p38 and NF-κB and increased the production of proinflammatory cytokines. The results challenge the view that geranylgeranylation is essential for the activity and localization of RHO family proteins and suggest that reduced geranylgeranylation in macrophages can initiate erosive arthritis.

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