Involvement of eicosanoid signalling in epithelial cell migration

Oliver Broom

Research output: ThesisDoctoral Thesis (compilation)

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Abstract

The development of inflammatory bowel diseases (IBD) and colon cancer (CC) has been shown to involve the up-regulation of inflammatory mediators and the machinery producing them such as the eicosanoids. Changes in the expression of extracellular matrix proteins and their related integrin receptors have also been shown to be important in the advancement IBD and CC. In light of this, we have investigated the role of eicosanoids in cell migration a key process in IBD and CC. This was through direct stimulation, with the eicosanoid leukotriene D4 (LTD4) or indirectly through inducing cyclooxygenase-2 (COX-2; an enzyme involved in the production of various eicosanoids) expression, by activating integrin collagen receptors. We observed that direct stimulation with LT D4, induced intestinal epithelial cell migration, through activation of the CysLT1 receptor, phosphotidylinositol-3 kinase, Vav2 and Rac localisation to membrane ruffles. Indirect stimulation, by activating COX-2 expression in a _2_1 integrin dependent manner was able to elicit a migratory response. The integrin dependent COX-2 expression was shown to be mediated through the activation of CD47 and its associated G_i3 protein, which in turn lead to protein kinase C_, the Ras GTPase and NF_B activation. COX-2 expression is synonymous with activation of the protein. Inhibition of COX-2 expression or specifically inhibiting COX-2 activity, resulted in cell adhesion being favoured over cell migration in a CD47 dependent manner.

Thus understanding cellular mechanisms leading to cell migration may reveal novel targets and lead to new therapeutic strategies in treating IBD and CC.
Original languageEnglish
QualificationDoctor
Awarding Institution
  • Cell Pathology, Malmö
Supervisors/Advisors
  • Sjölander, Anita, Supervisor
Award date2007 Oct 26
Publisher
ISBN (Print)978-91-85897-14-8
Publication statusPublished - 2007

Bibliographical note

Defence details

Date: 2007-10-26
Time: 09:15
Place: Main lecture hall, Pathology building, Malmö University Hospital, Malmö, Sweden

External reviewer(s)

Name: Ivaska, Johanna
Title: Docent
Affiliation: University of Turku and VTT Biotechnology centre, Turku, Finland

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<div class="article_info">Sailaja Paruchuri, Oliver Broom, Karim Dib and Anita Sjölander. <span class="article_issue_date">2005</span>. <span class="article_title">The Pro-inflammatory Mediator Leukotriene D4 Induces Phosphatidylinositol 3-Kinase and Rac-dependent Migration of Intestinal Epithelial Cells.</span> <span class="journal_series_title">J Biol Chem</span>, <span class="journal_volume">vol 280</span> <span class="journal_pages">pp 13538-13544</span>.</div>
<div class="article_info">Oliver Jay Broom, Ramin Massoumi and Anita Sjölander. <span class="article_issue_date">2006</span>. <span class="article_title">alpha2beta1 Integrin Signalling Enhances Cyclooxygenase-2 Expression in Intestinal Epithelial Cells.</span> <span class="journal_series_title">J Cell Physiol</span>, <span class="journal_volume">vol 209</span> <span class="journal_pages">pp 950-958</span>.</div>
<div class="article_info">Oliver Jay Broom, Ramin Massoumi, Per-Arne Oldenborg and Anita Sjölander. <span class="article_issue_date"></span>. <span class="article_title">CD47 dependent COX-2 expression and migration of intestinal epithelial cells.</span> (manuscript)</div>

Subject classification (UKÄ)

  • Cancer and Oncology

Keywords

  • histokemi
  • cytokemi
  • Medicin (människa och djur)
  • Histology
  • Medicine (human and vertebrates)
  • Biomedicinska vetenskaper
  • Biomedical sciences
  • Integrin
  • Eicosanoid
  • COX-2
  • Cell migration
  • cytochemistry
  • histochemistry
  • Histologi
  • tissue culture
  • vävnadskultur

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