Recent Advances in Expansion of Human Hematopoietic Stem Cells

Overview

Journal Blood Cell Ther

Date 2023 Dec 27

PMID 38149022

Authors

Masatoshi Sakurai

Affiliations

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Abstract

Hematopoietic stem cells (HSCs) are a rare cell population present in the bone marrow. They possess self-renewal and multipotent differentiation capacities and play a crucial role in lifelong hematopoiesis and reconstitution of the hematopoietic system after hematopoietic stem cell transplantation (HSCT). HSCT remains the only curative treatment for refractory hematologic disorders. Umbilical cord blood (CB) has several advantages as an alternative donor for HSCT, including HLA flexibility and lack of donor burden. However, CB has limitations in terms of cell dose, restricted donor options, and prolonged time to engraftment. Development of techniques for expanding HSCs , especially those contained in CB, has become a goal in the field of hematology. Attempts have been made to use various combinations of cytokines for this purpose, but these protocols showed limited expansion rates and did not progress to clinical applications. Recent advances that include the addition of small molecules to cytokines have enabled long-term and stable expansion of human HSCs. Clinical trials have been conducted with HSCs expanded in CB using these techniques, confirming their efficacy and safety. Furthermore, we recently developed a recombinant cytokine-free, albumin-free culture system for long-term expansion of human HSCs. This approach has the potential to selectively expand human HSCs more effectively than the previous protocols. We herein present an overview of culture protocols for expanding human HSCs together with the results of clinical trials that utilized these techniques.

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