title: Bone marrow-derived cells from male donors do not contribute to the endometrial side population of the recipient.
abstract: Accumulated evidence demonstrates the existence of bone marrow-derived cells origin in the endometria of women undergoing bone marrow transplantation (BMT). In these reports, cells of a bone marrow (BM) origin are able to differentiate into endometrial cells, although their contribution to endometrial regeneration is not yet clear. We have previously demonstrated the functional relevance of side population (SP) cells as the endogenous source of somatic stem cells (SSC) in the human endometrium. The present work aims to understand the presence and contribution of bone marrow-derived cells to the endometrium and the endometrial SP population of women who received BMT from male donors. Five female recipients with spontaneous or induced menstruations were selected and their endometrium was examined for the contribution of XY donor-derived cells using fluorescent in situ hybridization (FISH), telomapping and SP method investigation. We confirm the presence of XY donor-derived cells in the recipient endometrium ranging from 1.7% to 2.62%. We also identify 0.45-0.85% of the donor-derived cells in the epithelial compartment displaying CD9 marker, and 1.0-1.83% of the Vimentin-positive XY donor-derived cells in the stromal compartment. Although the percentage of endometrial SP cells decreased, possibly being due to chemotherapy applied to these patients, they were not formed by XY donor-derived cells, donor BM cells were not associated with the stem cell (SC) niches assessed by telomapping technique, and engraftment percentages were very low with no correlation between time from transplant and engraftment efficiency, suggesting random terminal differentiation. In conclusion, XY donor-derived cells of a BM origin may be considered a limited exogenous source of transdifferentiated endometrial cells rather than a cyclic source of BM donor-derived stem cells.
authors.affiliation: Fundación IVI-Instituto Universitario IVI-Universidad de Valencia, INCLIVA, Valencia, Spain.
authors.forename: Irene
authors.initials: I
authors.lastname: Cervelló
authors.forename: Claudia
authors.initials: C
authors.lastname: Gil-Sanchis
authors.forename: Aymara
authors.initials: A
authors.lastname: Mas
authors.forename: Amparo
authors.initials: A
authors.lastname: Faus
authors.forename: Jaime
authors.initials: J
authors.lastname: Sanz
authors.forename: Federico
authors.initials: F
authors.lastname: Moscardó
authors.forename: Gema
authors.initials: G
authors.lastname: Higueras
authors.forename: Miguel Angel
authors.initials: MA
authors.lastname: Sanz
authors.forename: Antonio
authors.initials: A
authors.lastname: Pellicer
authors.forename: Carlos
authors.initials: C
authors.lastname: Simón
mesh_terms: D000328:Adult; D001854:Bone Marrow Cells / Q000166:cytology* / Q000378:metabolism; D016026:Bone Marrow Transplantation; D004717:Endometrium / Q000166:cytology*; D005260:Female; D005455:Fluorescent Antibody Technique; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D017493:Leukocyte Common Antigens / Q000378:metabolism; D008297:Male; D060245:Tetraspanin 29 / Q000378:metabolism; D014019:Tissue Donors; D014746:Vimentin / Q000378:metabolism
chemical_list: D060245:Tetraspanin 29; D014746:Vimentin; D017493:Leukocyte Common Antigens