Conditional abatement of tissue fibrosis using nucleoside analogs to selectively corrupt DNA replication in transgenic fibroblasts

Masayuki Iwano, Andreas Fischer, Hirokazu Okada, David Plieth, Chengsen Xue, Theodore M. Danoff, Eric G. Neilson*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

86 Scopus citations


Progressive tissue fibrosis can compromise epithelial function resulting in organ failure. Appreciating evidence suggests that fibroblasts provide fibrogenic collagens during such injury. We further tested this notion by attempting to reduce the physiologic consequences of organ fibrosis through the selective killing of fibroblasts at sites of injury. Here, we report the conditional reduction of tissue fibroblasts using the coding sequence for herpesvirus thymidine kinase (ΔTK) put under the control of a cell-specific promoter from the gene encoding fibroblast-specific protein 1 (FSP1). Transgenic fibroblasts from mice carrying FSP1.ΔTK minigenes expressed thymidine kinase concordantly with native FSP1 and, compared to transgenic epithelium, were selectively susceptible to the lethal effects of nucleoside analogs either in culture or during experimental renal fibrosis. The numbers of fibroblasts in fibrogenic kidney tissue were reduced on exposure to nucleoside analogs as was the degree of type I collagen deposition and the extent of fibrosis. Fibroblast reduction following the stress of DNA chain termination highlights the important contribution of cell division during fibrogenesis. Our findings convey a proof of principle regarding the importance of FSP1+ fibroblasts in fibrosis as well as providing a new approach to treating the relentless scarification of tissue.

Original languageEnglish (US)
Pages (from-to)149-159
Number of pages11
JournalMolecular Therapy
Issue number2
StatePublished - 2001


  • FSP1
  • Fibroblasts
  • Fibrosis
  • S100A4
  • Thymidine kinase

ASJC Scopus subject areas

  • Molecular Medicine
  • Molecular Biology
  • Genetics
  • Pharmacology
  • Drug Discovery


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