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What is the homing ability of stem cells?
What is the homing ability of stem cells?
“Homing” originally referred to the tendency of lymphocytes circulating in the bloodstream to migrate back to the very lymphoid tissues—such as lymph nodes—from which they initially originated. This return phenomenon is known as “lymphocyte homing,” and it is Proposed by Gallation in 1983, the concept of "homing" was later gradually extended to stem cells.
Stem cells have the remarkable ability to "find their way home"—the exact microenvironment where they can thrive and survive, much like an old, experienced horse that always knows its stable. This process is what we call "homing." Stem cells can venture out from their home in the peripheral blood, wander briefly, and then precisely locate and settle into the ideal "niche" within the microenvironment—where they can ultimately take root, flourish, and live happily ever after.
Stem cell homing refers to the process by which endogenous or exogenous stem cells, guided by various factors, migrate directionally and cross vascular endothelial cells to reach their target tissues, where they subsequently engraft and survive—much like the massive migration of white blood cells toward the site of inflammation following a localized immune response in the human body.
The microenvironment serves as the initial trigger for stem cell homing, as tissue injury locally upregulates a variety of signaling molecules, including chemokines, adhesion factors, and growth factors. Each distinct microenvironment secretes unique combinations of these signals, guiding MSCs to migrate specifically toward the injured tissue. Ultimately, stem cells home to the bone marrow, as well as to various organs, inflammatory sites, trauma locations—even targeting tumor regions.
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