Results
| PMID | 27130956 |
| Gene Name | KLRK1 |
| Condition | Endometriosis |
| Association |
Associated |
| Population size | 63 |
| Population details | 63 (30 women with endometriosis, 33 women without endometriosis) |
| Sex | Female |
| Associated genes | TGF-?1 |
| Other associated phenotypes |
Endometriosis |
|
Hum Reprod. 2016 Jul;31(7):1462-74. doi: 10.1093/humrep/dew057. Epub 2016 Apr 30. Guo, Sun-Wei| Du, Yanbo| Liu, Xishi Shanghai Obstetrics and Gynecology Hospital, Fudan University, 419 Fangxie Road, Shanghai 200011, China Shanghai Key Laboratory of Female Reproductive Endocrine-Related Diseases, Fudan University, Shanghai, China hoxa10@outlook.com.| Shanghai Obstetri STUDY QUESTION: Does platelet-derived transforming growth factor-beta1 (TGF-beta1) have any role in the reduced cytotoxicity of natural killer (NK) cells in women with endometriosis? SUMMARY ANSWER: Platelet-derived TGF-beta1 suppresses the expression of NK Group 2, Member D (NKG2D) on NK cells, resulting in reduced cytotoxicity in women with endometriosis, but neutralization of TGF-beta1 reverses the reduction. WHAT IS KNOWN ALREADY: NK cells are cytotoxic lymphocytes that play an important role in peritoneal immune surveillance, and their function is known to be impaired in women with endometriosis. There is increased platelet aggregation in endometriotic lesions and increased platelet activation rate in the peripheral blood in women with endometriosis, yet activated platelets release copiousTGF-beta1, which is known to be a potent immunosuppressive molecule that suppresses NK cell function and NKG2D expression. STUDY DESIGN, SIZE, DURATION: Cross-sectional clinical studies of 30 women with endometriosis and 33 women without endometriosis and in vitro experimentation with and without TGF-beta1 blockade. PARTICIPANTS/MATERIALS, SETTING, METHODS: Peritoneal fluid (PF) samples from premenopausal women with endometriosis and age- and menstrual phase-matched controls were collected. Platelet count, white blood cell (WBC) count, mean platelet volume (MPV), platelet activation rate, TGF-beta1 concentration, expression levels of NKG2D on NK cells in the PF were evaluated. The apoptosis of freshly isolated NK cells treated with PF from women with endometriosis, the NK cytotoxicity and NKG2D expression treated with PF in the presence or absence of an anti-TGF-beta1 antibody were also determined. MAIN RESULTS AND THE ROLE OF CHANCE: The platelet count, WBC count, MPV, platelet activation rate and the TGF-beta1 concentration in the PF from women with endometriosis were significantly elevated when compared with those of women without endometriosis. The TGF-beta1 concentration correlated positively with the platelet activation rate (r = 0.59, P < 0.01), suggesting that activated platelets are responsible, at least in part, for the increased TGF-beta1 concentration. The cytotoxicity of freshly isolated NK cells treated with PF of women with endometriosis is significantly reduced when compared with that of women without endometriosis. Both the platelet activation rate and the TGF-beta1 concentration in the PF correlated negatively with the NKG2D expression in NK cells isolated from the PF (r = -0.36, P < 0.01, and r = -0.45, P < 0.01, respectively). In addition, the NKG2D expression level and the cytotoxicity in freshly isolated NK cells were found to be significantly reduced if co-cultured with PF from women with endometriosis, but the TGF-beta1 blockade effectively reverses the reduction. LIMITATIONS, REASONS FOR CAUTION: This study is limited by the cross-sectional nature of the study. WIDER IMPLICATIONS OF THE FINDINGS: NKG2D is known to potently activate NK cells, so potent that it even overrides inhibitory signals transduced by other inhibitory receptors. This is the first time we demonstrate that platelet-derived TGF-beta1 may be responsible for reduced NKG2D expression as well as reduced cytotoxicity of NK cells in women with endometriosis. This study provides yet another piece of evidence that platelets play critical roles in the development of endometriosis, and anti-platelet treatment should improve NK cell functionality in treating endometriosis. Equally important, this study highlights the critical role of the lesion microenvironment in shaping NK cell-mediated anti-endometriotic immunity. STUDY FUNDING/COMPETING INTERESTS: This research was supported in part by grants 81270676 (S.-W.G.), 81471434 (S.-W.G.), 81530040 (S.-W.G.), and 81370695 (X.L.) from the National Natural Science Foundation of China, and grant 2013ZYJB0019 (X.L.) from Shanghai Municipal Commission of Health and Family Planning. None of the authors has anything to disclose. Mesh Terms: Adult| Apoptosis| Blood Platelets/*metabolism| Cell Proliferation| Cross-Sectional Studies| Down-Regulation| Endometriosis/*genetics/immunology/metabolism| Female| Humans| Killer Cells, Natural/immunology/*physiology| NK Cell Lectin-Like Recepto |
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