Nonmarrow Hematopoiesis Occurs in a Hyaluronic-Acid-Rich Node and Duct System in Mice

作者：Hwang Sunhee; Lee Seung J; Park Sang H; Chitteti Brahmananda R; Srour Edward F; Cooper Scott; Hangoc Giao; Broxmeyer Hal E; Kwon Byoung S^*

来源：Stem Cells and Development, 2014, 23(21): 2661-2671.

DOI：10.1089/scd.2014.0075

A hyaluronic-acid-rich node and duct system (HAR-NDS) was found on the surface of internal organs of mice, and inside their blood and lymph vessels. The nodes (HAR-Ns) were filled with immune cells of the innate system and were especially enriched with mast cells and histiocytes. They also contained hematopoietic progenitor cells (HPCs), such as granulocyte-macrophage, erythroid, multipotential progenitors, and mast cell progenitors (MCPs). MCPs were the most abundant among the HPCs in HAR-Ns. Their frequency was fivefold higher than that of the MCPs in bone marrow. In addition, the system contained pluripotent stem cells (PSCs) capable of producing CD45(-)Flk1(+) hemangioblast-like cells, which subsequently generated various types of HPCs and differentiated blood cells. Although HAR-Ns did not appear to harbor enough number of cells capable of long-term reconstitution or short-term radioprotection of lethally irradiated recipients, bone marrow cells were able to engraft in the HAR-NDS and reconstitute hematopoietic potentials of the system. PSCs and HPCs were consistently found in intravenous, intralymphatic, and intestinal HAR-ND. We infer that PSCs and HPCs reside in the HAR-ND and that this novel system may serve as an alternative means to traffic immature and mature blood cells throughout the body.

• 出版日期2014-11-1