Microcavity arrays as an in vitro model system of the bone marrow niche for hematopoietic stem cells.

Abstract:

In previous studies human mesenchymal stromal cells (MSCs) maintained the "stemness" of human hematopoietic progenitor cells (HPCs) through direct cell-cell contact in two-dimensional co-culture systems. We establish a three-dimensional (3D) co-culture system based on a custom-made chip, the 3(D)-KITChip, as an in vitro model system of the human hematopoietic stem cell niche. This array of up to 625 microcavities, with 300 mum size in each orientation, was inserted into a microfluidic bioreactor. The microcavities of the 3(D)-KITChip were inoculated with human bone marrow MSCs together with umbilical cord blood HPCs. MSCs used the microcavities as a scaffold to build a complex 3D mesh. HPCs were distributed three-dimensionally inside this MSC network and formed ss-catenin- and N-cadherin-based intercellular junctions to the surrounding MSCs. Using RT(2)-PCR and western blots, we demonstrate that a proportion of HPCs maintained the expression of CD34 throughout a culture period of 14 days. In colony-forming unit assays, the hematopoietic stem cell plasticity remained similar after 14 days of bioreactor co-culture, whereas monolayer co-cultures showed increasing signs of HPC differentiation and loss of stemness. These data support the notion that the 3D microenvironment created within the microcavity array preserves vital stem cell functions of HPCs more efficiently than conventional co-culture systems.

SEEK ID: https://fairdomhub.org/publications/275

PubMed ID: 26829941

Projects: SBEpo - Systems Biology of Erythropoietin

Publication type: Journal

Journal: Cell Tissue Res

Citation: Cell Tissue Res. 2016 Jun;364(3):573-584. doi: 10.1007/s00441-015-2348-8. Epub 2016 Jan 30.

Date Published: 3rd Feb 2016

Registered Mode: Not specified

Authors: P. Wuchter, R. Saffrich, S. Giselbrecht, C. Nies, H. Lorig, S. Kolb, A. D. Ho, E. Gottwald

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Created: 13th Oct 2016 at 12:02

Last updated: 3rd Aug 2020 at 18:37

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