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Biomedical subjects

A Arici

Publications and source records attributed to A Arici.

At least 55 records · Page 3Linked to original sources

The effect of monocyte chemotactic protein 1 in intraperitoneal adhesion formation in a mouse model.

OBJECTIVE: Intraperitoneal adhesions are a significant cause of morbidity among women of reproductive age. Monocyte chemotactic protein 1 plays a role in the chemotaxis of mononuclear cells and fibroblasts into the peritoneal injury site. To evaluate its role in intraperitoneal adhesion formation, we used an established postsurgical adhesion model in mice. STUDY DESIGN: Surgical adhesions in mice were induced by scraping and crushing peritoneal sites. We analyzed the injury sites for the temporal expression of monocyte chemotactic protein 1 messenger ribonucleic acid and cellular infiltration at 12 to 24 hours across 10 days and evaluated the effects of monocyte chemotactic protein 1 and anti-monocyte chemotactic protein 1 neutralizing antibody on adhesion formation. On induction of adhesions animals were randomly assigned to 1 of 4 groups: (1) control, (2) nonspecific immunoglobulin G, (3) monocyte chemotactic protein 1, (4) anti-monocyte chemotactic protein 1 antibody. Animals received daily intraperitoneal injections for 6 days. Adhesions were scored on day 14 and immunostained for fibroblasts and macrophages. RESULTS: Adhesions developed consistently by the fifth postoperative day. We detected an increase in monocyte chemotactic protein 1 messenger ribonucleic acid expression at 48 hours; this remained until the fourth postoperative day. By the second day macrophages were present at the injury site. Animals treated with anti-monocyte chemotactic protein 1 antibody had significantly fewer adhesions develop than did the other three groups. CONCLUSION: This study demonstrates that monocyte chemotactic protein 1 may play a role in adhesion formation. Inhibiting the action of this chemokine may help to prevent adhesions.

Animals↗

Comparison of intrauterine insemination with timed intercourse in superovulated cycles with gonadotropins: a meta-analysis.

OBJECTIVE: To compare timed intercourse and IUI with the husband's sperm in patients with unexplained infertility who are undergoing superovulation with gonadotropins. DESIGN: Meta-analysis. All published reports of randomized, prospective studies with an English-language abstract extracted from MEDLINE were analyzed. A crossover search was done from the papers obtained. SETTING: Academic center. PATIENT(S): Couples with unexplained infertility. INTERVENTION(S): Meta-analysis of studies evaluating patients superovulated with gonadotropins and randomized for timed intercourse or IUI. MAIN OUTCOME MEASURE(S): Pregnancy rates (PRs) were obtained. The common odds ratio (OR) and 95% confidence intervals (95% CI) were calculated. RESULT(S): There were 49 pregnancies in 431 cycles of timed intercourse (11.37%), whereas there were 110 pregnancies in 549 cycles of IUI (20.04%). The PRs for IUI were significantly increased compared with those for timed intercourse in superovulation cycles (common OR = 1.84; 95% CI = 1.30-2.62). CONCLUSION(S): On the basis of the meta-analysis of 980 cycles in randomized and prospective studies, a patient's chances of becoming pregnant are greater with IUI with her husband's sperm than with timed intercourse in cycles superovulated with gonadotropins.

Adult↗

Expression and hormonal regulation of monocyte chemotactic protein-1 in myometrium and leiomyomata.

OBJECTIVE: The pathogenesis of leiomyoma likely involves interactions of sex steroids with paracrine growth factors or cytokines resulting in modulation of local immunity. Monocyte chemotactic protein-1 (MCP-1) is a chemotactic and activating factor for monocytes and is produced by multiple tumors and has antitumor effects. We investigated the expression of MCP-I in leiomyoma and myometrium as well as the regulatory role of steroid hormones and cytokines on MCP-1 expression and the effect of MCP-1 on the proliferation of leiomyoma cells. DESIGN: Prospective study. SETTING: University medical center. PATIENT(S): Women with (n = 20) or without (n = 11) leiomyoma. INTERVENTION(S): First. MCP-1 messenger RNA (mRNA) levels in myometrium and leiomyoma were measured, and then myometrial and leiomyoma cells in culture were treated with steroid hormones and cytokines. MAIN OUTCOME MEASURE(S): The MCP-1 mRNA was evaluated by Northern analysis. Immunoreactive MCP-1 in cell cultures was quantified by ELISA. Leiomyoma cell proliferation was assessed with [3H]thymidine incorporation. RESULT(S): The MCP-1 mRNA levels in myometrial samples were 4.7-fold higher than in the leiomyoma samples. Myometrial MCP-1 mRNA levels were 2.4-fold higher in secretory than in proliferative phase samples. The highest MCP-1 levels were observed in samples from women using GnRH analogues. Estradiol and progestins, alone or in combination, resulted in a decrease in MCP-1 protein production. There was an increase in the proliferation of leiomyoma cells treated with anti-MCP-1 neutralizing antibody. CONCLUSION(S): These findings suggest that MCP-1 may have antineoplastic activity in leiomyomata and that sex steroids may be exerting their growth stimulatory effect in leiomyomata through down-regulation of MCP-1.

Adult↗

Basic fibroblast growth factor: peritoneal and follicular fluid levels and its effect on early embryonic development.

OBJECTIVE: To investigate the effect of basic fibroblast growth factor (FGF) on preimplantation embryos and to evaluate the levels of basic FGF in follicular and peritoneal fluid. DESIGN: Prospective study. SETTING: University-based laboratory. PATIENT(S): Follicular fluids (FFs) were obtained from women undergoing ovulation induction (n = 62) and peritoneal fluids were obtained from women with (n = 49) or without (n = 12) endometriosis. INTERVENTION(S): The effect of basic FGF on mouse embryos was assessed. Basic FGF concentrations were measured in pre-hCG and post-hCG FFs and in peritoneal fluids. MAIN OUTCOME MEASURE(S): Two-cell murine embryos were treated with basic FGF and followed for the rate of blastocyst formation and embryo hatching. Follicular and peritoneal fluid basic FGF levels were measured by ELISA. RESULT(S): Basic FGF (10 ng/mL) decreased the rate of blastocyst formation and embryo hatching. The level of basic FGF did not change in the FF around ovulation, and there was no correlation between FF basic FGF levels and reproductive parameters, with the exception of age. The levels of basic FGF in the peritoneal fluid of women with or without endometriosis were not different. CONCLUSION(S): Basic FGF is present in follicular and peritoneal fluids, but its concentration in these fluids does not change during the menstrual cycle or in the presence of endometriosis. Basic FGF inhibits murine preimplantation embryonic development at concentrations 10-100 times higher than the levels detected in follicular and peritoneal fluids.

Aging↗

Adverse effects of hydrosalpinx on pregnancy rates after in vitro fertilization-embryo transfer.

OBJECTIVE: To determine the effect of hydrosalpinx on the establishment of pregnancy after IVF-ET. DESIGN: Metaanalysis. SETTING: University medical center. PATIENT(S) AND INTERVENTION(S): All published reports (n=13) and abstracts (n=10) in English that examined the relation between hydrosalpinx and IVF-ET were included in the analysis. The metaanalysis was performed by first calculating the odds ratios for each trial and then combining them to obtain a pooled estimate of the odds ratio and a 95% confidence interval. MAIN OUTCOME MEASURE(S): Clinical pregnancy. RESULT(S): A total of 5,569 cycles was reviewed in the group without hydrosalpinx, and a total of 1,144 was reviewed in the group with hydrosalpinx. The clinical pregnancy rate was approximately 50% lower in patients who had hydrosalpinx. Similarly, the implantation rate was decreased by 50%. These effects were observed also in thawed ET cycles. The abortion rate was more than twofold higher in patients who had hydrosalpinx. CONCLUSION(S): This metaanalysis suggests that hydrosalpinx is associated with a reduced chance of implantation and an increased risk of pregnancy loss.

Embryo Transfer↗

Myometrial tissue in uterine septa.

STUDY OBJECTIVE: To assess the frequency of myometrial tissue in the septa of septate uteri. DESIGN: Retrospective review (Canadian Task Force classification II-2). SETTING: University-affiliated tertiary referral center. PATIENTS: Twenty-nine consecutive women with uterine septa diagnosed by magnetic resonance imaging (MRI). INTERVENTIONS: The MRI examination was performed with a 1.5 Tesla scanner using high-resolution phased array coils with multiplanar fast-spin echo and T1-weighted sequences. Of resected septa, tissue was available in four for histologic evaluation for the presence of myometrial tissue. MEASUREMENTS AND MAIN RESULTS: In 17 women MRI showed a partial septum, all containing myometrium. The 12 patients with complete septum had evidence of myometrium in the upper part of the septum, with fibrous tissue constituting the lower part. Histology reviewed from four resected septa (2 partial, 2 complete) reported myometrial tissue. CONCLUSION: Uterine septa are frequently composed of myometrial tissue.

Adult↗

Follicular fluid of women with endometriosis stimulates the proliferation of endometrial stromal cells.

The peritoneal environment in endometriosis is known to have growth-promoting effects on endometrial cells. To investigate whether follicular fluid, a contributor to the peritoneal fluid, stimulates endometrial cell proliferation, we incubated endometrial stromal cells in culture with various dilutions of follicular fluid obtained from women with or without endometriosis undergoing oocyte retrieval for in-vitro fertilization. Cell proliferation assays were performed using follicular fluid from 28 women (without endometriosis, n = 13; with endometriosis, n = 15) in eight different endometrial stromal cell culture set-ups. Cell proliferation was assessed by a colorimetric method. Maximum cell proliferation was detected when endometrial cells were incubated with 50% dilution of follicular fluid for 48 h. Follicular fluid from women with endometriosis induced significantly higher cell proliferation than follicular fluid from women without endometriosis (P < 0.05). Our findings indicate that follicular fluid contents may contribute to the growth-promoting factors in the peritoneal fluid of women with endometriosis.

Adult↗

The role of monocyte chemotactic protein-1 in intraperitoneal adhesion formation.

Abdomino-pelvic adhesions arise from infection, endometriosis, or peritoneal injury during surgery, and represent a significant source of morbidity in women of reproductive age. Monocyte chemotactic protein-1 (MCP-1) plays a role in the chemotaxis of mononuclear cells and fibroblasts in a murine wound repair model. To evaluate the role of MCP-1 in intraperitoneal adhesion formation, we investigated peritoneal fluid MCP-1 levels of women undergoing laparoscopy. Patients without endometriosis were divided into two groups: normal fertile women undergoing bilateral tubal ligation without intraperitoneal adhesions (n=14) and women with pelvic adhesions (n=8). Patients with endometriosis were arranged into two groups: women with (n=17) and without (n=17) adhesions. Peritoneal fluid MCP-1 levels were quantified using an enzyme-linked immunosorbent assay (ELISA). Peritoneal biopsy samples were immunostained for the detection of MCP-1 protein and macrophages, and were also processed for the presence of MCP-1 mRNA expression. Among women without endometriosis, the median peritoneal fluid MCP-1 level was 144 pg/ml (range 54-261) in women without adhesions and was 336 pg/ml (range 130-2494) in women with adhesions (P=0.01). There was a significant correlation between adhesion scores and MCP-1 levels (r=0.50; P=0.018). Among women with endometriosis, peritoneal fluid MCP-1 levels significantly correlated with the stage of the disease. The presence or absence of adhesions did not significantly affect the peritoneal fluid MCP-1 levels in this group of women. In summary, we have found that women with adhesions have elevated peritoneal fluid MCP-1 levels. However, we were not able to show an incremental effect of adhesions on peritoneal fluid MCP-1 levels of patients with endometriosis. Thus, we conclude that factors besides the intraperitoneal adhesions contribute to the elevated peritoneal fluid MCP-1 levels in patients with endometriosis.

Adult↗

Leukemia inhibitory factor in human reproduction.

PROBLEM: Leukemia inhibitory factor (LIF) is a pleiotropic cytokine of the interleukin-6 family and has different biological actions in various tissue systems. Although named for its ability to inhibit proliferation of a myeloid leukemic cell line by inducing differentiation, it also regulates the growth and differentiation of embryonic stem cells, primordial germ cells, peripheral neurons, osteoblasts, adipocytes, and endothelial cells. LIF is crucial for successful implantation of the embryo in mice. Currently, there is an accumulation of data about the role of LIF in human reproduction. METHOD OF STUDY: This review of the literature and of our studies focuses on the expression, regulation, and effects of LIF in the human endometrium, fallopian tube, and ovarian follicle. RESULTS: Human endometrium expresses LIF in a menstrual cycle-dependent manner. Maximal expression is observed between days 19 and 25 of the menstrual cycle, coinciding with the time of implantation. Various cytokines and growth factors induce endometrial LIF expression in vitro. LIF receptor is expressed in endometrial tissue throughout the menstrual cycle and on human blastocysts in a stage-dependent manner. Affecting the trophoblast differentiation pathway toward the adhesive phenotype, LIF plays a role in implantation. LIF is also expressed and secreted by the epithelial cells of the fallopian tube. Its increased expression in the tubal stromal cell cultures by the inflammatory cytokines suggests a link between salpingitis and ectopic implantation in the tube. The rising follicular fluid LIF level around the time of ovulation indicates that LIF may play a role in ovulatory events, early embryonic development, and implantation. CONCLUSIONS: There is growing evidence that LIF may be one of the entities that plays a role in human reproduction.

Animals↗

The peritoneal fluid levels of interleukin-12 in women with endometriosis.

PROBLEM: Interleukin-12 (IL-12) is produced mainly by monocytes/macrophages, and it induces proliferation and cytotoxicity of T-cells and natural killer cells. In women with endometriosis, natural killer cell activity in the peritoneal fluid is significantly decreased. We aimed to measure the peritoneal fluid level of IL-12 in endometriosis. METHOD OF STUDY: We measured IL-12 levels in peritoneal fluid samples from women with or without endometriosis and in supernatants from endometrial stromal, ovarian stromal, and mesothelial cell cultures, using a high-sensitivity enzyme-linked immunosorbent assay. RESULTS: The median concentration of IL-12 in the peritoneal fluid of women with endometriosis was 1.1 pg/ml (range, 0.2-5.5) and was 1.6 pg/ml (range, 0.4-2.8) in women without endometriosis, not a statistically significant difference. IL-12 was not detected in the supernatants of endometrial stromal, ovarian stromal, and mesothelial cell cultures. CONCLUSION: Concentrations of IL-12 in the peritoneal fluid of women with or without endometriosis are low, but they are detectable and are not affected significantly by the presence of endometriosis.

Adult↗

Fas-fas ligand system-induced apoptosis in human placenta and gestational trophoblastic disease.

PROBLEM: The low frequency of maternal immune responses to paternally inherited fetal antigens raises the following question: What regulates the immunobiology of pregnancy? Data suggest that this state is the result of peripheral immune-tolerance, an active process of immune-regulation in which activated T cells undergo apoptosis. We studied Fas ligand (FasL) expression and apoptosis in normal and pathologic placentas to find out whether the Fas-FasL-induced apoptosis takes place during implantation. METHOD OF STUDY: FasL expression in paraffin sections was detected using specific antibodies and confirmed with reverse transcriptase-polymerase chain reaction of total RNA from frozen placentas. Apoptosis was detected using the terminal deoxy (d)-UTP nick end-labeling assay. RESULTS: FasL was found in the normal placenta and in gestational trophoblastic disease. Apoptotic leukocytes were localized to the maternal-fetal interface corresponding in localization with the distribution of FasL. CONCLUSIONS: We propose that FasL expression in the placenta is a mechanism responsible for the development of maternal immune tolerance specific for paternal alloantigens and operates in pathologic states characterized by trophoblastic invasion/proliferation.

Apoptosis↗

Interleukin-8 induces proliferation of endometrial stromal cells: a potential autocrine growth factor.

Proliferation of endometrium is dependent on sex steroid hormones, but specific growth factors are likely to play an important role in regulating this process. A number of cytokines and growth factors are synthesized in the endometrium in response to sex steroid hormones and act to regulate endometrial function. Endometrial cells produce interleukin-8 (IL-8) both in vivo and in vitro. We hypothesized that IL-8, a neutrophil chemoattractant/activating factor and a potent angiogenic agent that has been shown to stimulate growth in other cell types, may directly stimulate proliferation of endometrial cells. We first investigated the effect of IL-8 and mouse antihuman-IL-8 neutralizing antibody on endometrial stromal cell proliferation using both a colorimetric assay and thymidine uptake. We then investigated the modulation of endometrial stromal cell IL-8 production and proliferation by antisense oligonucleotides specific for IL-8. There was a concentration-dependent increase of cell proliferation with IL-8 (2-fold at 1 ng/mL; P < 0.01 between control and concentrations above 0.01 ng/mL) and a concentration-dependent inhibition of cell proliferation with anti-IL-8 antibody (to 30% of the control at 1 microg/mL; P < 0.01 between control and concentrations above 0.1 microg/mL). IL-8 antisense oligonucleotide treatment decreased IL-8 production by endometrial stromal cells in culture as well as cell proliferation when it is compared with scrambled (nonsense) oligonucleotide treatment (P < 0.01). Addition of IL-8 (1 ng/mL) reversed the proliferation inhibitory effect of IL-8 antisense oligonucleotides. We propose that IL-8 may act as an autocrine growth factor in the endometrium, and suggest that it may also play a role in the pathogenesis of endometriosis.

Adult↗

Interleukin-8 in the human endometrium.

We have previously shown that interleukin-8 (IL-8), a cytokine with neutrophil chemotactic/activating and T cell chemotactic activity, is produced by human endometrial stromal and glandular cells in culture. The present study investigated the temporal and spatial expression of IL-8 messenger ribonucleic acid (mRNA) and protein in the human endometrium. Endometrial tissue (n = 52) was obtained from human uteri after hysterectomy conducted for reasons other than endometrial disease or from endometrial biopsies. The day of the menstrual cycle was established from women's menstrual history and was confirmed by histology. Half of the tissues (n = 26) were snap-frozen in liquid nitrogen, cellular RNA was extracted, and Northern blots were hybridized with a riboprobe complementary to a specific sequence of IL-8 mRNA. The remaining tissues (n = 26) were processed for frozen sections, and immunohistochemistry was performed using mouse antihuman IL-8 antibody. Comparison of IL-8 mRNA levels throughout the menstrual cycle revealed that late secretory and early to midproliferative phase IL-8 expression was significantly greater than midcycle expression (P < 0.02). Analysis of the IL-8 immunohistochemistry revealed that IL-8 protein is found in the surface epithelium and glands throughout the menstrual cycle. There was no detectable immunoreactive IL-8 in the stromal cells. We conclude that IL-8 is produced in the human endometrium in vivo, and the variations of IL-8 mRNA throughout the menstrual cycle suggest that sex hormones may regulate its gene expression. We speculate that IL-8 may modulate the timely recruitment of neutrophils and lymphocytes into the endometrium.

Animals↗

Sonohysterography for screening in recurrent pregnancy loss.

OBJECTIVE: To evaluate the role of sonohysterography for screening of the uterine cavity in patients with recurrent pregnancy loss. DESIGN: Prospective evaluation of sonohysterography, including comparison with available hysterosalpingography and hysteroscopy. SETTING: University referral center. PATIENT(S): Thirty-four reproductive-aged women with at least two consecutive pregnancy losses. INTERVENTION(S): Sonohysterography was performed on all patients, using saline instilled through an endocervically placed balloon catheter with concurrent vaginal sonography. RESULT(S): Seventeen of 34 sonohysterograms (50.0%) demonstrated intrauterine abnormalities. Eighteen of 34 cases have undergone hysteroscopy or, in 1 case, laparoscopy. All confirmed the positive or negative sonohysterographic finding, resulting in a sensitivity and specificity of 100%. Additionally, 100% (12/12) of the defects were diagnosed accurately at sonohysterography when confirmed by surgery. Twenty-seven of 34 patients also had a hysterosalpingogram that demonstrated a 90.0% sensitivity and 20.0% specificity based on hysteroscopic findings, yet only 5 of 11 (45.5%) defects were diagnosed accurately at hysterosalpingography when compared with surgery. CONCLUSION(S): Sonohysterography is a highly sensitive, specific, and accurate screening tool for the evaluation of uterine cavitary defects associated with recurrent pregnancy loss and offers several advantages over hysterosalpingography.

Abortion, Habitual↗

Monocyte chemotactic protein-1 concentration in peritoneal fluid of women with endometriosis and its modulation of expression in mesothelial cells.

OBJECTIVE: To investigate monocyte chemotactic protein-1 concentrations in the peritoneal fluid (PF) of women with or without endometriosis, then assess peritoneal mesothelial cells as a potential source of monocyte chemotactic protein-1. DESIGN: Prospective study. SETTING: University medical center. PATIENT(S): Women with (n = 60) or without (n = 18) endometriosis. INTERVENTION(S): First monocyte chemotactic protein-1 levels in PF were measured, then mesothelial cells in culture were treated with cytokines. MAIN OUTCOME MEASURE(S): In PF and culture supernatants, monocyte chemotactic protein-1 was measured by ELISA. In vitro monocyte chemotactic protein-1 messenger RNA expression was evaluated by Northern analysis. RESULT(S): The median concentration of monocyte chemotactic protein-1 in PF of control women was 137 pg/mL (conversion factor to SI unit, 0.115; range, 12 to 418 pg/mL); that of women with moderate endometriosis was 205 pg/mL (range 65 to 6,000 pg/mL); and that of those with severe endometriosis was 1,165 pg/mL (0 to 2,602 pg/mL). Within the moderate to severe endometriosis group, monocyte chemotactic protein-1 levels were higher in women with untreated endometriosis (354 pg/mL range 0 to 6,000 pg/mL) than in women receiving GnRH agonist (128 pg/mL, range 0 to 216 pg/mL). In the control group, monocyte chemotactic protein-1 levels were higher in the proliferative phase than in the secretory phase. Mesothelial cells produced constitutively monocyte chemotactic protein-1; moreover, both interleukin-1 alpha and tumor necrosis factor-alpha induced higher levels of monocyte chemotactic protein-1. CONCLUSION(S): Levels of monocyte chemotactic protein-1 in PF were higher during the proliferative phase than secretory phase of control women and increased in moderate to severe endometriosis. The regulated expression of monocyte chemotactic protein-1 may recruit macrophages into PF and contribute to the pathogenesis of endometriosis.

Antineoplastic Agents, Hormonal↗

Monocyte chemotactic protein-1 expression in human preovulatory follicles and ovarian cells.

There is a considerable population of macrophages (5-15% of the cells) within the human ovarian follicle at the time of ovulation. Macrophages are also present within the ovarian stroma, mostly near perifollicular capillaries. We hypothesized that macrophage migration in and around the preovulatory follicle is hormonally regulated and that regulation of macrophage migration occurs through local modulation of monocyte chemotactic protein-1 (MCP-1) that chemoattracts and activates monocytes/macrophages. In this regard, we investigated the expression and regulation of MCP-1 in human follicular fluid and in ovarian stromal and granulosa-lutein cell cultures. The concentration of MCP-1 in follicular fluid samples obtained from women prior to the administration of hCG was (n = 4) 90 +/- 27 (mean +/- S.E.) pg/ml; in samples obtained 12 h after the hCG administration it was (n = 3) 135 +/- 23 pg/mL; in follicular fluids obtained 34 h after the hCG administration it was (n = 126) 322 +/- 46 pg/mL (P = 0.007 vs. pre-hCG). The mean ratio of follicular fluid/serum MCP-1 levels was 4.18. There was a correlation between follicular fluid MCP-1 levels and follicular fluid or serum progesterone levels (r = 0.21, P = 0.02; r = 0.29, P = 0.03, respectively). MCP-1 mRNA and the protein were expressed in ovarian stromal and granulosalutein cells in culture and were increased by interleukin-1 alpha and tumor necrosis factor-alpha in a time- and concentration-dependent manner. LH/hCG induced higher levels of MCP-1 mRNA expression and protein production in both cell cultures. We propose that regulation of MCP-1 in ovarian stromal and granulosa-lutein cells by cytokines may play a role in the physiology of periovulatory events.

Adult↗

Pathogenesis of endometriosis.

This article reviews the pathogenesis of endometriosis, which involves retrograde dissemination of endometrium and/or development in situ by metaplasia, and there is evidence suggesting that genetic and hormonal factors may play a role. There is also substantial evidence that immunologic factors, namely peritoneal macrophages, T cells, natural killer cells, and soluble products secreted by these cells, are involved in the pathogenesis of endometriosis.

Antibody Formation↗

Environmental toxins and endometriosis.

The effect of natural, environmental, or manufactured substances on endocrine organs is a current topic of discussion. Recently, some toxicants have been suggested to promote endometriosis; therefore, attention has turned to the role of environmental factors as a stimulant for endometriosis growth and maintenance. This article reviews the influence of various toxicants on endometriosis.

Animals↗