Abstract

Wharton’s jelly (WJ) is a gelatinous tissue within the umbilical cord that contains myofibroblast-like stromal cells. A unique cell population of WJ that has been suggested as displaying the stemness phenotype is the mesenchymal stromal cells (MSCs). Because MSCs’ stemness and immune properties appear to be more robustly expressed and functional which are more comparable with fetal than adult-derived MSCs, MSCs harvested from the “young” WJ are considered much more proliferative, immunosuppressive, and even therapeutically active stem cells than those isolated from older, adult tissue sources such as the bone marrow or adipose. The present review discusses the phenotypic characteristics, therapeutic applications, and optimization of experimental protocols for WJ-derived stem cells. MSCs derived from WJ display promising transplantable features, including ease of sourcing, in vitro expandability, differentiation abilities, immune-evasion and immune-regulation capacities. Accumulating evidence demonstrates that WJ-derived stem cells possess many potential advantages as transplantable cells for treatment of various diseases (e.g., cancer, chronic liver disease, cardiovascular diseases, nerve, cartilage and tendon injury). Additional studies are warranted to translate the use of WJ-derived stem cells for clinical applications.

Highlights

  • The advent of stem cells as a tool to decipher the cell’s biology and as a source of transplant therapy to correct aging and diseases has become a core research arena for tissue engineering and regenerative medicine

  • Stem cells have been derived in the amniotic compartment, the Wharton’s jelly (WJ) compartment, the perivascular compartment surrounding the vessels, the media and adventitia compartment of the walls of umbilical cord (UC) blood vessels, the endothelial compartment and the vascular compartment [16]

  • This study demonstrated the potential for chondrogenic differentiation of WJ-mesenchymal stem cells (MSC) in three-dimensional tissue engineering; higher seeding densities better promoted biosynthesis and mechanical integrity, and a seeding density of at least 25 million cells/mL is recommended for fibrocartilage tissue engineering with umbilical cord mesenchymal stromal cells [79]

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Summary

Introduction

The advent of stem cells as a tool to decipher the cell’s biology and as a source of transplant therapy to correct aging and diseases has become a core research arena for tissue engineering and regenerative medicine. The young age of WJ suggests that MSCs harvested from this fetal origin will exhibit a much more proliferative, immunosuppressive, and even therapeutically active stem cells than those isolated from older, adult tissue sources such as the bone marrow or adipose This alternative source of MSCs became feasible with the report by McElreavey et al [2] of the culture of cells from WJ, which is the primitive connective tissue of the human umbilical cord (UC), first described by Thomas Wharton in 1656 [3]. The present compilation of milestone discoveries on WJ-derived stem cells should aid in further moving the field of cell biology and therapy towards clinical applications

Anatomical Relationship of Various UC Structures and WJ as Sources of MSCs
Sources of Stem Cells
Immunomodulatory Property of WJ
Phenotypic Characterization of WJ
Cancer Therapy
Liver Disease
Cardiovascular Diseases
Cartilage Regeneration
Peripheral Nerve Repair
Cardiac Differentiation of Human WJ-Derived Stem Cells
Clonal MSCs
Use of Magnetic Resonance Imaging in Contrast Labeled-UC Stem Cells
Findings
Conclusions
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