Cell Line Development

Cell Line Development for Customized in vitro Models

The development of cell lines is crucial for biomedical research, drug development, and basic research, as it ensures consistency and reproducibility of results. We develop customized 2D/3D cell models for specialized applications and assays. For genetic modification, such as the integration of Genes of Interest (GOIs), we use transient transfection, stable genomic transfection via viral methods, or CRISPR/Cas. Our innovative recombinant expression systems enable targeted expression of inducible genes or proteins. As starting material, we use primary cells, primary-like cells, and cell lines, including human primary cells and liver tumor cell lines, as well as high-performance serum-free cultured CHO suspension cells. For specialized applications, we have successfully developed cell lines with recombinant expression of human phase I enzymes (CYPs) or GPCRs, making a significant contribution to drug research.

Characteristics and Benefit of the Technology

  • High flexibility through cell line adaptation to different culture conditions
    • Defined serum-free cultivation
    • Physiological 3D cell models with high significance
    • Suspension cultivation for high cell yields
    • Coculture models for cell-cell interaction analyses
  • Access to physiologically critical targets such as “difficult-to-express proteins” through inducible recombinant expression

 

Access our expertise to advance your research!

Our Contribution to Your Project

  • Generation of customized cell models based on primary cells, primary-like cells, and cell lines, in 2D or 3D
  • Establishment of coculture models for cell-cell interaction analyses
  • Specialized cell lines for your assay using lentiviral technologies and CRISPR/Cas
  • Constitutive and inducible gene or protein expression enables flexible solutions
  • Cell line adaptation to serum-free and suspension conditions for easy assay execution

 

Metabolism of Pharmaceuticals

Discover more offers and information on connected applications for this technology!

  • Drug metabolism
  • More precise screenings to accelerate your drug development

 

Producing Innovative Biocatalysts with Fungal‑based Cell‑free Synthesis Platforms

»PZ-Syn: Pilzbasierte zellfreie Syntheseplattformen«

© Alexander Karich
Cystoderma lilacipes in its natural environment.

In this project, Fraunhofer IZI‑BB, BTU Cottbus–Senftenberg, and TU Dresden were developing new cell‑free synthesis platforms for the rapid production of unspecific peroxygenases (UPOs) from fungi, to use them for synthesizing new active pharmaceutical ingredients and other specialty chemicals.

Zum Projekt (German)

Synthesis of G-Protein‑coupled Receptors - New Platforms for Targeted Drug Screening

»PZ-Syn+G: Synthese G-Protein-gekoppelter Rezeptoren«

© Fraunhofer IZI-BB

The »PZ‑Syn+G« project builds on the Fraunhofer project group »Fungal‑based cell‑free synthesis platforms« (PZ‑Syn) at the BTU Senftenberg campus and focuses on establishing a reliable production pipeline for functional G-protein‑coupled receptors (GPCRs) – a receptor family that, due to its key role in central signaling pathways, is the target of more than one‑third of approved drugs. Because of their complex structure, however, they are among the most difficult protein classes to access, creating a bottleneck for drug discovery and diagnostics.

Zum Projekt (German)

Microfluidic Bioreactors for in‑vitro Toxicity Measurements - Liver‑on‑a‑Chip

»HepatoTox: Mikrofluidische Bioreaktoren«

Microfluidic bioreactors for in-vitro toxicity measurements (Liver-on-a-Chip)
© Fraunhofer IZI-BB
Microfluidic bioreactors for in-vitro toxicity measurements (Liver-on-a-Chip)

The microphysiological system (liver‑on‑a‑chip) developed in this project for assessing the long‑term toxicity of drug compounds is intended to help replace animal testing. Real‑time concentration measurements of glucose and oxygen levels, as well as pH values, enable quality control and provide valuable time‑resolved information on hepatocyte metabolic activity when exposed to drug candidates or chemical substances.

ZUr Technologie (German)

Biotechnologically Activated Therapeutics – Tailored Platform for Precision Medicine

»NGD: Next Generation Drugs«

Fraunhofer IZI‑BB optimizes peroxygenases in cell‑free systems and develops human liver models to convert drugs such as clopidogrel and tamoxifen into highly potent, well‑tolerated metabolites. BTU and Fraunhofer IAP scale production and develop formulation and cellular testing.

Zum Projekt (German)

Methods

  • Fully equipped facility for cell culture work (S1/S2) up to bioreactor scale
  • Genetic modification of cells using viral or CRISPR-Cas-based gene transfer
  • Characterization of primary cells and cell lines, e.g., with regard to:
    • Proliferation, migration
    • Gene expression using PCR and RT-qPCR methods
    • Protein expression using microscopic and flow cytometric (immuno)detection (e.g., fluorescence staining, Western blot, FACS)
    • Enzyme activity
    • Metabolism
    • Cytotoxicity

Equipment

  • PCR (Biometra Tadvanced, Analytic Jena) and RT-qPCR (LightCycler®, Roche)
  • Flow cytometry including fluorescence-activated cell sorting (FACS Cellsorter SH800S, Sony Biotechnology)
  • Multimode plate reader ClarioStar Plus (BMG Labtech)
  • Confocal laser scanning microscope (Zeiss LSM 980 with NLO laser), incubation chamber, multiphoton excitation, fluorescence/phosphorescence lifetimes and correlations using lifetime imaging (FLIM/PLIM) and fluorescence correlation spectroscopy (FCS)
  • Fully automated fluorescence microscopes for time-lapse imaging of living cells under physiological conditions (time-lapse microscopy with incubation chambers) (CellSens; ScanR with AI)
  • TIRF microscopy (Olympus)
  • Laser tweezers / optical tweezers with laser microdissection (Palm / Zeiss)
  • Precellys Evolution Touch homogenizer (Bertin Instruments)
  • Next Generation Sequencing (NGS) (Illumina MiniSeq™)
  • HPLC (Shimadzu) and UHPLC (Ultimate 3000 nanoRSLC, Dionex)

Publications

  • Steinbrecht S, Pfeifer N, Herzog N, Katzenberger N, Schulz C, Kammerer S, Küpper J-H. HepG2-1A2 C2 and C7: Lentivirus vector-mediated stable and functional overexpression of cytochrome P450 1A2 in human hepatoblastoma cells. Toxicology Letters 319 (2020) 155–159.
  • Schulz C, Jung F, Küpper J-H. Inhibition of phase-1 biotransformation and cytostatic effects of diphenyleneiodonium on hepatoblastoma cell line HepG2 and a CYP3A4-overexpressing HepG2 cell clone. Clin Hemorheol Microcirc 79 (2021) 231-243.
  • Schulz C, Herzog N, Kubick S, Jung F, Küpper J-H. Stable Chinese Hamster Ovary Suspension Cell Lines Harboring Recombinant Human Cytochrome P450 Oxidoreductase and Human Cytochrome P450 Monooxygenases as Platform for In Vitro Biotransformation Studies. Cells 12 (2023) 2140.
  • Knauer J-F, Schulz C, Zemella A, Wüstenhagen D-A, Walter R-M, Lüpper J-H, Kubick S. Synthesis of mono Cytochrome P450 in a modified CHO‑CPR cell‑free protein production platform. Scientific Reports 14 (2024) 1271
  • Schulz C, Stegen S, Jung F, Küpper J-H. Mono-CYP CHO Model: A Recombinant Chinese Hamster Ovary Cell Platform for Investigating CYP-Specific Tamoxifen Metabolism. Int. J. Mol. Sci. 26 (2025) 3992

Patent

  • Schulz C, Küpper J-H. Testsystem aufweisend stabil CYP-transfizierte oder transduzierte Säugetierzellen. DE 10 2023 102 366.7 / WO 2024 16 08 63 A1