Unknown,Transcriptomics,Genomics,Proteomics

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A Novel Human Gastric Primary Cell Culture System for Modeling Helicobacter Pylori Infection In Vitro

ABSTRACT: We identified specific long-term culture conditions that allow the formation of 3-dimensional human gastric spheroids, which can be differentiated by withdrawal of Wnt3A and R-spondin1 to human gastric organoids. These cultures can expand indefinitely and exhibit important characteristics of human stomach tissue. Furthermore, these 3-dimensional cultures can be transferred into 2-dimensional primary epithelial cell layers, which can be successfully infected with H. pylori and thereby provide ideal conditions to study infections in vitro. Microarray experiments were performed as dual-color hybridizations on Agilent human whole genome catalog 44K arrays. To compensate for dye-specific effects, a dye-reversal color-swap was applied.

ORGANISM(S): Homo sapiens

SUBMITTER: Hans-Joachim Mollenkopf

PROVIDER: E-GEOD-58473 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:In Rspondin-based three-dimensional cultures, Lgr5 stem cells from multiple organs form ever-expanding epithelial organoids that retain their tissue identity. Here we report the establishment of tumor organoid cultures from 20 consecutive colorectal carcinoma (CRC) patients. For most, organoids were also generated from adjacent normal tissue. Organoids closely resemble the original tumor. The spectrum of genetic changes within the 'living biobank' agrees well with previous large-scale mutational analyses of CRC. Gene expression analysis indicates that the major CRC molecular subtypes are represented. Tumor organoids are amenable to high-throughput drug screens allowing detection of gene-drug associations. As an example, a single organoid culture was exquisitely sensitive to Wnt secretion (porcupine) inhibitors and carried a mutation in the negative Wnt feedback regulator RNF43, rather than in APC. Organoid technology may fill the gap between cancer genetics and patient trials, complement cell line- and xenograft-based drug studies and allow personalized therapy design. Self-renewal of the intestinal epithelium is driven by Lgr5 stem cells located in crypts. We have recently developed a long-term culture system that maintains basic crypt physiology. Wnt signals are required for the maintenance of active crypt stem cells. Indeed, the Wnt agonist R-spondin1 induces dramatic crypt hyperplasia in vivo. R-spondin-1 is the ligand for Lgr5. Epidermal growth factor (EGF) signaling is associated with intestinal proliferation, while transgenic expression of Noggin induces a dramatic increase in crypt numbers. The combination of R-spondin-1, EGF, and Noggin in Matrigel sustains ever-expanding small intestinal organoids, which display all hallmarks of the original tissue in terms of architecture, cell type composition, and self-renewal dynamics. We adapted the culture condition for long-term expansion of human colonic epithelium and primary colonic adenocarcinoma, by adding nicotinamide, A83-01 (Alk inhibitor), Prostaglandin E2 and the p38 inhibitor SB202190. Of note, a two-dimensional culture method for cells from normal and malignant primary tissue has been described by Schlegel and colleagues. Here, we explore organoid technology to routinely establish and phenotypically annotate ‘paired organoids’ derived from adjacent tumor and healthy epithelium from CRC patients.

Project description:We previously established long-term 3D organoid culture systems for several murine tissues (intestine, stomach, pancreas and liver) as well as human intestine and pancreas. Here, we describe culture conditions to generate long-term 3D culture from human gastric stem cells. The technology can be applied to study the epithelial response to infection with Helicobacter pylori. Human gastric cultures can expand indefinitely in 3D Matrigel. Cultures can be generated from normal tissue, from single sorted stem cells, or from tumor tissue. Organoids maintain many characteristics of the respective tissue in terms of histology, marker expression and euploidy. Organoids from normal tissue express markers of four lineages of the stomach and self-organize in gland and pit-domains. They can be directed to specifically express either lineages of the gastric gland, or the gastric pit by addition of Nicotinamide and withdrawal of Wnt. While gastric pit lineages react marginally to bacterial infection, gastric gland lineages mount a strong inflammatory response. The gastric culture system provides a unique tool to study gastric pathologies. We generated 2 sets of experiments. The first set contains organoids in 4 conditions: (1) organoids in expansion condition ENRWFGNiTi ("gland-type organoids") from 3 donors, (2) organoids as in 1 but differentiated for 4 days in differentiation condition ENR_FGNiTi ("pit'type organoids"), (3) organoids as in 1 but infected with Helicobacter pylori strain P12 MOI 50 for 2 h, (4) organoids as in 2 but infected as in 3. All 4 conditions were tested on the same organoid line in parallel. This experiment was conducted independently with cultures from 3 different donors. The second set of experiments compares freshly isolated glands with organoids. Samples from 2 patients were analyzed. Each patient received a total gastrectomy. From each patient, glands from corpus region or pyloric antrum were isolated. From each isolation, one aliquod was stored for microarray analysis and one aliquod used to generate organoids. Organoids and glands were subsequently lysed and analyzed in parallel.

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A Novel Human Gastric Primary Cell Culture System for Modeling Helicobacter Pylori Infection In Vitro

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