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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The distribution of CD10 (NEP 24.11, CALLA) in humans and mice is similar in non-lymphoid organs but differs within the hematopoietic system: absence on murine T and B lymphoid progenitors.

Prior studies in the human have implied an important function for CD10 (CALLA, neutral endopeptidase 24.11) in early lymphoid development. To examine the role of this ectoenzyme in an experimental system, a rat mAb specific for mouse CD10, termed R103, was generated. Immunohistological and flow cytometric analyses indicate that the distribution of CD10 in non-lymphoid anatomical compartments is virtually identical in human and mouse. However, CD10 expression within the hematopoietic system is strikingly different. In contrast to human spleen, lymph node and thymus, the corresponding mouse organs contain no detectable CD10+ cells. Mouse granulocytes, unlike human granulocytes, also lack CD10 expression. Five-color flow cytometric studies of adult bone marrow (BM) from C57BL/6 and BALB/c mice with mAb specific for CD43, B220, HSA, BP-1 and immunoglobulin M fail to detect any significant number of CD10+ cells at pro-B, pre-B or B cell stages. In addition, lymphoid cells in both (rIL-7) independent and rIL-7-dependent in vitro pro-B cell cultures lack CD10 expression. Consistent with this result, CD10 mRNA is not detected. Unlike the AA4.1+ population from day 13 and 14 fetal liver, the CD10+ subset is unable to reconstitute T and B lymphoid compartments in RAG-2-/- mice. Nevertheless, mouse CD10 is readily found on BM stromal elements known to support early B lineage lymphoid development. Given the common expression of CD10 on human and mouse BM stromal elements, this enzyme may have an important function in the stromal cell-dependent phase of hematopoiesis.[1]


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