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Injectable, scalable 3D tissue-engineered model of marrow hematopoiesis.

Abstract：

:Modeling the interaction between the supportive stroma and the hematopoietic stem and progenitor cells (HSPC) is of high interest in the regeneration of the bone marrow niche in blood disorders. In this work, we present an injectable co-culture system to study this interaction in a coherent in vitro culture and in vivo transplantation model. We assemble a 3D hematopoietic niche in vitro by co-culture of supportive OP9 mesenchymal cells and HSPCs in porous, chemically defined collagen-coated carboxymethylcellulose microscaffolds (CCMs). Flow cytometry and hematopoietic colony forming assays demonstrate the stromal supportive capacity for in vitro hematopoiesis in the absence of exogenous cytokines. After in vitro culture, we recover a paste-like living injectable niche biomaterial from CCM co-cultures by controlled, partial dehydration. Cell viability and the association between stroma and HSPCs are maintained in this process. After subcutaneous injection of this living artificial niche in vivo, we find maintenance of stromal and hematopoietic populations over 12 weeks in immunodeficient mice. Indeed, vascularization is enhanced in the presence of HSPCs. Our approach provides a minimalistic, scalable, biomimetic in vitro model of hematopoiesis in a microcarrier format that preserves the HSPC progenitor function, while being injectable in vivo without disrupting the cell-cell interactions established in vitro.

journal_name

Biomaterials

journal_title

Biomaterials

authors

Tavakol DN,Tratwal J,Bonini F,Genta M,Campos V,Burch P,Hoehnel S,Béduer A,Alessandrini M,Naveiras O,Braschler T

doi

10.1016/j.biomaterials.2019.119665

subject

Has Abstract

pub_date

2020-02-01 00:00:00

pages

119665

eissn

0142-9612

issn

1878-5905

pii

S0142-9612(19)30764-1

journal_volume

232

pub_type

杂志文章

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