Diseases of the mesodermal tissues of the body including wound healing, arthritis, osteoporosis and muscular wasting diseases, affect millions of people across the globe. If existing barriers to the efficient derivation of mesodermal tissues from readily-available, patient-matched stem cells could be overcome, these diseases could be treated with stem cell-based regenerative medicine. Unfortunately, robust directed differentiation of mesoderm from embryonic stem cells (ESC) and induced pluripotent stem cells (IPSC) is currently limited to cardiovascular and blood derivatives. Reproducible protocols for the differentiation of muscle, cartilage, and connective tissues, or more specifically, those mesodermal derivatives produced solely from pre-somitic mesoderm (PSM), have yet to emerge. While it is possible to obtain some cell types of the posterior mesoderm from human ESC, these efficiencies (commonly <1%) must be vastly improved before regenerative procedures for these tissues will be feasible. Previous studies have indicated the presence of an endogenous PSM-progenitor (PSM-Pr) cell located at the border of the primitive streak and Hensen's node (the PSM-Pr niche). Progeny of the PSM-Pr colonize the paraxial mesoderm and give rise to the somites, which in turn produce the skeletal muscle, cartilage, and connective tissue of the embryo. The primary focus of the work described here is to identify and exhaustively characterize the cell types that comprise and maintain the endogenous progenitor stem cell and its niche. In this project we will (1) identify all cell types located in the border region and (2) evaluate the role of key signaling pathways in the maintenance of the PSM-Pr and the PSM-Pr niche. Successful completion of these goals will provide unprecedented insight into the generation of somitic mesoderm and enable novel approaches to the generation of therapeutically relevant mesodermal cell types for clinical use.

Public Health Relevance

The goals of this exploratory grant are to identify the long-term progenitor of the pre-somitic mesoderm and characterize functions required for the maintenance of this cell type and its niche. This knowledge will provide important insight into the generation of vertebrate axial mesoderm and, therefore, also into musculoskeletal birth defects and human disease. Moreover, identification and characterization of the PSM-Pr and its niche will provide a foundation for the guided differentiation of mesodermal derivatives for the treatment of musculoskeletal disorders including, wound healing, arthritis, osteoporosis, and muscle wasting diseases.

Agency
National Institute of Health (NIH)
Institute
Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD)
Type
Exploratory/Developmental Grants (R21)
Project #
5R21HD071606-02
Application #
8501607
Study Section
Skeletal Biology Development and Disease Study Section (SBDD)
Program Officer
Mukhopadhyay, Mahua
Project Start
2012-07-01
Project End
2014-06-30
Budget Start
2013-07-01
Budget End
2014-06-30
Support Year
2
Fiscal Year
2013
Total Cost
$183,634
Indirect Cost
$65,009
Name
University of Connecticut
Department
Biochemistry
Type
Schools of Arts and Sciences
DUNS #
614209054
City
Storrs-Mansfield
State
CT
Country
United States
Zip Code
06269