Cutaneous mast cell maturation does not depend on an intact bone marrow microenvironment.
We sought to determine whether the maturation of murine cutaneous mast cells from stem cells depends on an intact bone marrow microenvironment. Normal bone marrow cells (+/+) were infused into 2 groups of mast cell-deficient mice: WBB6F1-W/Wv mice and 89Sr-pretreated W/Wv mice. 89Sr is a long-lived bone-seeking radioisotope which provides continuous irradiation of the marrow and thereby ablates the marrow microenvironment. Skin biopsies revealed that the 89Sr-pretreated mice and the controls had repopulated their skin with mast cells equally well. Natural killer cell function was significantly depressed in the 89Sr-treated mice, confirming that the marrow microenvironment had been functionally altered. We conclude that, although the precursors for cutaneous mast cells are marrow derived, they do not need an intact marrow microenvironment for maturation.
D000818:Animals; D001853:Bone Marrow / Q000528:radiation effects; D001854:Bone Marrow Cells; D002454:Cell Differentiation; D005260:Female; D007694:Killer Cells, Natural / Q000502:physiology; D008407:Mast Cells / Q000166:cytology*; D051379:Mice; D008817:Mice, Mutant Strains; D012867:Skin / Q000166:cytology*; D013234:Stem Cells / Q000166:cytology; D013326:Strontium Radioisotopes
D013326:Strontium Radioisotopes