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Adenoviral p53 gene transfer inhibits human Tenon’s capsule fibroblast proliferation
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  1. K T M Johnson1,
  2. F Rödicker2,
  3. K Heise1,
  4. C Heinz1,
  5. K-P Steuhl1,
  6. B M Pützer2,
  7. T Hudde1
  1. 1Zentrum für Augenheilkunde, Abteilung für Erkrankungen des vorderen Augenabschnitts, Hufelandstrasse 55, D-45147 Essen, Germany
  2. 2Department of Vectorology and Experimental Gene Therapy, University of Rostock Medical School, Institute Bldg, Schillingallee 70, D-18055 Rostock, Germany
  1. Correspondence to: Tobias Hudde Zentrum für Augenheilkunde, Abteilung für Erkrankungen des vorderen Augenabschnitts, Hufelandstrasse 55, D-45147 Essen, Germany; tobias.huddeuni-essen.de

Abstract

Background/aim: Although antiproliferative drugs have been used successfully to prevent scarring after filtration surgery in patients with glaucoma, complications associated with their use (such as hypotony or endophthalmitis) energise the search for an alternative treatment. Single application of β radiation leads to long term growth arrest and expression of p53 in human Tenon’s capsule fibroblasts (hTf). The authors assume that the activation of p53 is one of the cellular triggers. Their aim was to analyse the effect of p53 overexpression on hTf and to determine which pathways are involved.

Methods: A recombinant adenoviral vector (rAd.p53) containing transgenes encoding for human p53 and green fluorescent protein (GFP) was used to induce overexpression of p53 in hTF and a control vector (rAd.GFP). Transgene expression was detected by western blot (p53 and p21WAF-1/Cip1). Cell proliferation and viability were investigated using cell counts, 5′-bromodeoxyuridine incorporation (BrdU assay) and tetrazolium reduction (MTT assay).

Results: Infection of hTf with rAd.p53 resulted in significant inhibition of cell proliferation, DNA synthesis, and metabolic activity in vitro. Western blot showed increased levels of p53 and p21WAF-1/Cip1 in rAd.p53 infected cells, but not in rAd.GFP and uninfected cells. Apoptosis was excluded with flow cytometry.

Conclusions: Adenoviral p53 gene transfer leads to significant growth inhibition in hTf. P53 induces p21WAF-1/Cip1 expression and does not cause apoptosis in hTf in vitro. p53 as an antiproliferative drug has the potential to replace mitomycin C and 5-fluorouracil in glaucoma surgery.

  • BrdU, bromodeoxyuridine
  • CDK, cyclin dependent kinases
  • DMEM, Dulbecco’s modified Eagle’s medium
  • ECL, enhanced chemiluminescence
  • GFP, green fluorescent protein
  • FCS, fetal calf serum
  • hTf, human Tenon’s capsule fibroblasts
  • MOI, multiplicity of infection
  • PCNA, proliferating cell nuclear antigen
  • pfu, plaque forming units
  • rAd.p53, recombinant adenoviral vector
  • gene transfer
  • human Tenon’s capsule fibroblast
  • BrdU, bromodeoxyuridine
  • CDK, cyclin dependent kinases
  • DMEM, Dulbecco’s modified Eagle’s medium
  • ECL, enhanced chemiluminescence
  • GFP, green fluorescent protein
  • FCS, fetal calf serum
  • hTf, human Tenon’s capsule fibroblasts
  • MOI, multiplicity of infection
  • PCNA, proliferating cell nuclear antigen
  • pfu, plaque forming units
  • rAd.p53, recombinant adenoviral vector
  • gene transfer
  • human Tenon’s capsule fibroblast
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Footnotes

  • None of the authors has any commercial interest in any of the products or methods mentioned or any other competing interest.

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