Fibrosis in fresh human lung tissue

Pulmonary fibrosis is a severe chronic lung disease causing irreversible dysfunction of the organ. It is characterized by an abnormal repair process, causing uncontrolled deposition of extracellular matrix (ECM) including collagen, excessive proliferation of fibroblasts, and destruction of the cellular architecture of the lung. Some features of fibrosis can be displayed ex vivo by using fresh lung tissue, so-called precision-cut lung slices (PCLS). PCLS contain epithelial cells, fibroblasts, smooth muscle cells, nerve fibers, and even immune cells such as antigen-presenting cells and T-cells. The tissue is fully viable. Cells in the tissue interact with each other, thereby reflecting the highly specialized function of the lung.

We use lung tissue of laboratory animals and human donors. The tissue is exposed ex vivo to a cocktail of growth factors. PCLS are subsequently examined for tissue responses at the protein and RNA levels and for changes in cellular phenotype. Features of fibrosis can thus be investigated – using tissue of different species including human. We found the tissue response to be highly comparable with the in-vivo response, and it can be used for prediction of organ responses.

Readout parameters

  • Tissue viability: assessed by LDH assay, WST-1 assay, calcein AM/EthD-1 staining
  • Cytokine response of lung tissue: cytokine levels by ELISA or MSD, protein expression by Western blot
  • Histology imaging: conventional stainings, histopathology, immunohistochemistry, and scoring
  • Lung tissue analysis: RNA isolation for gene expression analysis


  1. Switalla S, Lauenstein L, Prenzler F, Knothe S, Förster C, Fieguth HG, Pfennig O, Schaummann F, Martin C, Guzman CA, Ebensen T, Müller M, Hohlfeld JM, Krug N, Braun A, Sewald K. Natural innate cytokine response to immunomodulators and adjuvants in human precision-cut lung slices. Toxicol Appl Pharmacol 246 (2010): 107-115.
  2. Switalla S, Knebel J, Ritter D, Krug N, Braun A, Sewald K. Effects of acute in vitro exposure of murine precision-cut lung slices to gaseous nitrogen dioxide and ozone in an air-liquid interface (ALI) culture. Toxicol Lett 196 (2010): 117-124.
  3. Seehase S, Schlepütz M, Switalla S, Mätz-Rensing K, Kaup FJ, Zöller M, Schlumbohm C, Fuchs E, Lauenstein HD, Winkler C, Kuehl AR, Uhlig S, Braun A, Sewald K, Martin C. Bronchoconstriction in nonhuman primates: a species comparison. J Appl Physiol 111 (2011): 791-798.
  4. Seehase S, Lauenstein HD, Schlumbohm C, Switalla S, Neuhaus V, Förster C, Fuchs E, Kaup FJ, Zöller M, Braun A, Sewald K, Knauf S. LPS-induced lung inflammation in marmoset monkeys – an acute model for anti-inflammatory drug testing. PLoS ONE August 28, 2012, doi: 10.1371/journal.pone.0043709.
  5. Lauenstein L, Switalla S, Prenzler F, Seehase S, Pfennig O, Förster C, Fieguth H, Braun A, Sewald K. Assessment of immunotoxicity induced by chemicals in human precision-cut lung slices (PCLS). Toxicol In Vitro 28 (2014): 588-599.
  6. Hess A, Wang-Lauenstein L, Braun A, Kolle SN, Landsiedel R, Liebsch M, Ma-Hock L, Pirow R, Schneider X, Steinfath M, Vogel S, Martin C, Sewald K. Prevalidation of the ex-vivo model PCLS for prediction of respiratory toxicity, Toxicol In Vitro 32 (2016): 347-61.


Katherina Sewald

Contact Press / Media

Dr. Katherina Sewald

Head of Department of Preclinical Pharmacology and In-vitro Toxicology

Phone +49 511 5350-323