Abstract
Hematopoietic stem cells (HSCs) exist in a close contact with their specific microenvironment, called a niche, which supports the HSC function and significantly influences the HSC properties. The existence of the HSC niche, which was proposed as a purely theoretical concept in 1978, finds increasing experimental evidence and is now generally accepted by specialists in the field of hematopoiesis. The review briefly describes various cell components of the HSC niche in bone marrow, considers the metabolic states of the niche and HSCs, and discusses other aspects of niche biology. Increasing knowledge of the HSC niche will help to create in vitro cell models of the HSC niche, to modulate the HSC properties, and to achieve multifold HSC expansion in culture for further applications in therapeutic practice.
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