A hierarchal and tightly controlled organization of various cell types is the hallmark of normal tissues and organs, and the hypothesis underlying this proposal is that pre-defining the specific location and resultant cell- cell interactions of individual cells within a 3D tissue construct will allow one to create highly functional tissues in which the role of cell-cell interactions on cell phenotype can be precisely delineated. This concept will be explored by developing a 3D model of human hematopoiesis, in which osteoprogenitors and vascular cells will be probed for their roles in defining the hematopoietic stem cell (HSC) niche.
The specific aims i nclude (1) the development of microfluidic techniques to allow large-scale encapsulation of single cells in highly defined extracellular matrix mimics in order to determine how matrix cues regulate mesenchymal stem cell differentiation at the single cell level, (2) the creation of hybrid integrated circuit/microfluidic circuit systems to enable one to assemble picoliter drops containing individual cells and synthetic ECM into 3D assemblies with pre-defined structure and organization, and (3) determining whether appropriate in vitro assembly of HSCs and cells representative of the bone marrow HSC niche can yield functional hematopoietic tissues capable of recreating hematopoiesis in vitro. Success in this project will lead to the creation of a new set of tools that will enable formation of 3D tissues with precisely defined cell placement, and homotypic and heterotypic cell-cell interactions. These tools are likely to be broadly useful to the creation of new in vitro models of tissue development and drug screening, and in vivo tissue replacements from a variety of cell types. As stem cells are particularly sensitive to environmental cues, inappropriate cell-cell and cell-matrix interactions likely lead to the irreversible and undesirable alterations in stem cell differentiation fate found in culture. The systems developed in this project will allow us to investigate the specific role of vascular cells and osteoprogenitors/osteoblasts in maintaining the human HSC niche, which is a difficult question to address in vivo. It is crucial to better define and create models of the niche to understand normal hematopoiesis and pathologies involving blood cells, and to enable hematopoiesis on demand in various therapeutic venues. The key studies to date on this topic have relied on rodent models, and the relevance of many findings to human biology is currently unclear. (End of Reviewers'Comment)

Public Health Relevance

The production of blood cells (hematopoiesis) is a continuous, critical activity of stem cell in the body, and its dysregulation has severe repercussions. This project will lead to a better understanding of this process by developing new culture models of human hematopoiesis, and it is expected these models will provide insight on current therapies using blood stem cells, could lead to the production of human blood cells that could be used to treat patients, and may also improve our understanding of diseases involving blood cell production.

Agency
National Institute of Health (NIH)
Institute
National Institute of Biomedical Imaging and Bioengineering (NIBIB)
Type
Research Project (R01)
Project #
5R01EB014703-03
Application #
8495116
Study Section
Special Emphasis Panel (ZHL1-CSR-N (M1))
Program Officer
Hunziker, Rosemarie
Project Start
2011-09-15
Project End
2015-07-31
Budget Start
2013-08-01
Budget End
2014-07-31
Support Year
3
Fiscal Year
2013
Total Cost
$768,726
Indirect Cost
$233,843
Name
Harvard University
Department
Type
Schools of Engineering
DUNS #
082359691
City
Cambridge
State
MA
Country
United States
Zip Code
02138
Liu, Eric Y; Jung, Sukwon; Weitz, David A et al. (2018) High-throughput double emulsion-based microfluidic production of hydrogel microspheres with tunable chemical functionalities toward biomolecular conjugation. Lab Chip 18:323-334
Guo, Ming; Pegoraro, Adrian F; Mao, Angelo et al. (2017) Cell volume change through water efflux impacts cell stiffness and stem cell fate. Proc Natl Acad Sci U S A 114:E8618-E8627
Prakadan, Sanjay M; Shalek, Alex K; Weitz, David A (2017) Scaling by shrinking: empowering single-cell 'omics' with microfluidic devices. Nat Rev Genet 18:345-361
Lienemann, Philipp S; Rossow, Torsten; Mao, Angelo S et al. (2017) Single cell-laden protease-sensitive microniches for long-term culture in 3D. Lab Chip 17:727-737
Hu, Yuebi; Mao, Angelo S; Desai, Rajiv M et al. (2017) Controlled self-assembly of alginate microgels by rapidly binding molecule pairs. Lab Chip 17:2481-2490
Mao, Angelo S; Shin, Jae-Won; Utech, Stefanie et al. (2017) Deterministic encapsulation of single cells in thin tunable microgels for niche modelling and therapeutic delivery. Nat Mater 16:236-243
Goncalves, Kevin A; Silberstein, Lev; Li, Shuping et al. (2016) Angiogenin Promotes Hematopoietic Regeneration by Dichotomously Regulating Quiescence of Stem and Progenitor Cells. Cell 166:894-906
Silberstein, Lev; Goncalves, Kevin A; Kharchenko, Peter V et al. (2016) Proximity-Based Differential Single-Cell Analysis of the Niche to Identify Stem/Progenitor Cell Regulators. Cell Stem Cell 19:530-543
Shin, Jae-Won; Mooney, David J (2016) Extracellular matrix stiffness causes systematic variations in proliferation and chemosensitivity in myeloid leukemias. Proc Natl Acad Sci U S A 113:12126-12131
Mao, Angelo S; Shin, Jae-Won; Mooney, David J (2016) Effects of substrate stiffness and cell-cell contact on mesenchymal stem cell differentiation. Biomaterials 98:184-91

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