Dataset Information

Heterogeneous Distribution of Fetal Microchimerism in Local Breast Cancer Environment.

ABSTRACT: Fetal cells enter maternal circulation during pregnancy and persist in the woman's body for decades, achieving a form of physiological microchimerism. These cells were also evidenced in tumors. We investigated the frequency and concentration of fetal microchimerism in the local breast cancer environment. From 19 patients with confirmed breast neoplasia, after breast surgical resection, we collected three fresh specimens from the tumor core, breast tissue at tumor periphery, and adjacent normal breast tissue. The presence of male DNA was analyzed with a quantitative PCR assay for the sex determining region gene (SRY) gene. In the group of women who had given birth to at least one son, we detected fetal microchimerism in 100% of samples from tumors and their periphery and in 64% (9 of 14) of those from normal breast tissue. The tissues from the tumor and its periphery carry a significantly increased number of SRY copies compared to its neighboring common breast tissue (p = 0.005). The median of the normalized SRY-signal was about 77 (range, 3.2-21467) and 14-fold (range, 1.3-2690) greater in the tumor and respectively in the periphery than in the normal breast tissue. In addition, the relative expression of the SRY gene had a median 5.5 times larger in the tumor than in its periphery (range, 1.1-389.4). We found a heterogeneous distribution of fetal microchimerism in breast cancer environment. In women with sons, breast neoplasia harbors male cells at significantly higher levels than in peripheral and normal breast tissue.

SUBMITTER: Nemescu D

PROVIDER: S-EPMC4726590 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature

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Heterogeneous Distribution of Fetal Microchimerism in Local Breast Cancer Environment.

Nemescu Dragos D Ursu Ramona Gabriela RG Nemescu Elena Roxana ER Negura Lucian L

PloS one 20160125 1

Fetal cells enter maternal circulation during pregnancy and persist in the woman's body for decades, achieving a form of physiological microchimerism. These cells were also evidenced in tumors. We investigated the frequency and concentration of fetal microchimerism in the local breast cancer environment. From 19 patients with confirmed breast neoplasia, after breast surgical resection, we collected three fresh specimens from the tumor core, breast tissue at tumor periphery, and adjacent normal b ...[more]

PMID: 26808509

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Project description:Introduction Fetal microchimerism could be involved in the regulation of breast cancer oncogenesis. CD34+ cells could be of a particular interest as up to 12% of the CD34+ population in maternal blood are of fetal origin. The aim of this research was to analyze the impact of umbilical cord blood (UCB) CD34+ on MCF-7 and MDA-MB-231 breast cancer cell lines. Material and Methods UCB CD34+ cells were obtained from healthy women at full-term delivery. Direct and indirect cultures were grown with MCF-7 and MDA-MB-231 cells. Proliferation, migration, invasion, and transcriptomic analysis of breast cancer cell lines were compared between cultures exposed and non-exposed to UCB CD34+ cells. Interactions between UCB CD34+ and breast cancer cells were analyzed under fluorescent microscopy. Functional analyses were generated with QIAGEN’s Ingenuity Pathway Analysis (IPA) and Gene Set Enrichment Analysis (GSEA). Results Direct contact between UCB CD34+ and breast cancer cell lines induced a reduction in the proliferative capacities of MCF-7 and MDA-MB-231 and diminished the migration abilities of MDA-MB-231 cells. In 3D co-culture, UCB CD34+ cells were attracted by tumor spheroids and incorporated into tumor cells. These cell-to-cell interactions were responsible for transcriptome modifications coherent with observed functional modifications. Among the cytokines secreted by UCB CD34+, INF- was identified as a potential upstream regulator responsible for the molecular modifications observed in transcriptomic analysis of MCF-7 breast cancer cells exposed to UCB CD34+ cells, as was IL-17A in MDA-MB-231 cells. Conclusion Direct cell-to-cell contact induces functional modifications in breast cancer cells. Interactions between UCB CD34+ and breast cancer cells could induce cell fusion and signal transmission via cytokines. Further analysis of direct cell-to-cell interactions should be performed at a molecular level to further understand the potential role of fetal CD34+ cells in breast cancer.

Project description:Women with scleroderma (SSc) maintain significantly higher quantities of persisting fetal microchimerism (FMc) from complete or incomplete pregnancies in their peripheral blood compared to healthy women. The non-classical class-I human leukocyte antigen (HLA) molecule HLA-G plays a pivotal role for the implantation and maintenance of pregnancy and has often been investigated in offspring from women with pregnancy complications. However data show that maternal HLA-G polymorphisms as well as maternal soluble HLA-G (sHLA-G) expression could influence pregnancy outcome. Here, we aimed to investigate the underlying role of maternal sHLA-G expression and HLA-G polymorphisms on the persistence of FMc. We measured sHLA-G levels by enzyme linked immunosorbent assay in plasma samples from 88 healthy women and 74 women with SSc. Male Mc was quantified by DYS14 real-time PCR in blood samples from 58 women who had previously given birth to at least one male child. Furthermore, eight HLA-G 5'URR/3'UTR polymorphisms, previously described as influencing HLA-G expression, were performed on DNA samples from 96 healthy women and 106 women with SSc. Peripheral sHLA-G was at lower concentration in plasma from SSc (76.2?±?48.3?IU/mL) compared to healthy women (117.5?±?60.1?IU/mL, p?<?0.0001), independently of clinical subtypes, autoantibody profiles, disease duration, or treatments. Moreover, sHLA-G levels were inversely correlated to FMc quantities (Spearman correlation, p?<?0.01). Finally, women with SSc had lower sHLA-G independently of the eight HLA-G 5'URR/3'UTR polymorphisms, although they were statistically more often homozygous than heterozygous for HLA-G polymorphism genotypes -716 (G/T), -201 (G/A), 14?bp (ins/del), and +3,142 (G/A) than healthy women. In conclusion, women with SSc display less sHLA-G expression independently of the eight HLA-G polymorphisms tested. This decreased production correlates with higher quantities of persisting FMc commonly observed in blood from SSc women. These results shed some lights on the contribution of the maternal HLA-G protein to long-term persistent fetal Mc and initiate new perspectives in this field.

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Heterogeneous Distribution of Fetal Microchimerism in Local Breast Cancer Environment.

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Heterogeneous Distribution of Fetal Microchimerism in Local Breast Cancer Environment.

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