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Thromb Haemost 2006; 96(05): 652-659
DOI: 10.1160/TH06-02-0069
Wound Healing and Inflammation/Infection
Schattauer GmbH

Platelet-induced growth of human fibroblasts is associated with an increased expression of 5-lipoxygenase

Cecilia Berg
1   Division of Pharmacology, Department of Medicine and Care, Linköping, Sweden
,
Sven Hammarström
2   Division of Cell Biology, Department of Biomedicine and Surgery, Linköping, Sweden
,
Helena Herbertsson
3   Division of Chemistry, Cardiovascular Inflammation Research Center, Linköping, Sweden
,
Eva Lindström
1   Division of Pharmacology, Department of Medicine and Care, Linköping, Sweden
,
Ann-Charlotte Svensson
1   Division of Pharmacology, Department of Medicine and Care, Linköping, Sweden
,
Mats Söderström
2   Division of Cell Biology, Department of Biomedicine and Surgery, Linköping, Sweden
,
Pentti Tengvall
4   Materials in Medicine, Division of Applied Physics, Department of Physics, Chemistry and Biology; Linköping University, Linköping, Sweden
,
Torbjörn Bengtsson
1   Division of Pharmacology, Department of Medicine and Care, Linköping, Sweden
› InstitutsangabenFinancial support: This study was supported by the Swedish Research Council (grants 71X-12668 to TB and 31X-05914 to SH&MS), the King Gustav V 80-year Foundation, Swedish Fund for Research without Animal Experiments, Trygg-Hansa Research Foundation, Forum Scientium graduate school at Linköping University, and the Swedish Foundation for Strategic Research.
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Publikationsverlauf

Received 01. Februar 2006

Accepted after resubmission 08. September 2006

Publikationsdatum:
01. Dezember 2017 (online)

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Summary

Proliferation of fibroblasts is vital for adequate wound healing but is probably also involved in different hyperproliferative disorders such as atherosclerosis and cancer. The regeneration of tissue usually starts with coagulation, involving release of mitogenic and inflammatory factors from activated platelets. This study focuses on the role of eicosanoids in the proliferative effects of platelets on human fibroblasts. We show that the phospholipase A2 inhibitor 7,7-dimethyl-5,8-eicosadienoic acid (DMDA), the combined cyclooxygenase (COX) and lipoxygenase (LOX) inhibitor 5,8,11,14-eicosatetraynoic acid (ETYA) and the LOX inhibitor 5,8,11-eicosatriynoic acid (ETI) block the platelet-induced proliferation of serum starved subconfluent human fibroblasts. Anti-proliferative effects were also obtained by specific inhibition of 5-LOX with 5,6-dehydro arachidonic acid (5,6-dAA), whereas the 12-LOX inhibitor cinnamyl-3,4-dihydroxy-α-cyanocinnamate (CDC) did not affect the platelet-stimulated growth of fibroblasts. The expression of 5-LOX was analyzed by reverse-transcriptase-mediated PCR (RT-PCR), Western blotting and HPLC. 5-LOX message and protein was detected in fibroblasts but not in platelets. Incubation with platelets markedly increased, already after one hour, the expression of 5-LOX in the fibroblast culture. The increased 5-LOX activity was associated with an elevated level of the 5-LOX metabolite 5-hydroxyeicosatetraenoic acid (5-HETE) reaching its maximum after 1–2 hours of co-incubation of fibroblasts and platelets. The 5-HETE production was reduced by the inhibitors DMDA, ETYA and ETI. In conclusion, this study suggests that platelet-stimulated proliferation of fibroblasts is mediated by an increased 5-LOX activity, which supports recent findings indicating a crucial role for this enzyme in proliferative disorders such as atherosclerosis.

Keywords

Fibroblasts - platelets - proliferation - 5-lipoxygenase - atherosclerosis
 

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