Transcriptomic profile of cell cycle progression genes in human ovarian granulosa cells

The ovarian granulosa cells (GCs) that form the structure of follicle undergo substantial modification during the various stages of human folliculogenesis. These modifications include morphological changes, accompanied by differential expression of genes, encoding proteins which are mainly involved in cell growth, proliferation and differentiation. Recent data bring a new insight into the aspects of GCs' stem-like specificity and plasticity, enabling their prolonged proliferation and differentiation into other cell types. This manuscript focuses attention on emerging alterations during GC cell cycle - a series of biochemical and biophysical changes within the cell. Human GCs were collected from follicles of women set to undergo intracytoplasmic sperm injection procedure, as a part of remnant follicular fluid. The cells were primarily cultured for 30 days. Throughout this time, we observed the prominent change in cell morphology from epithelial-like to fibroblast-like, suggesting differentiation to other cell types. Additionally, at days 1, 7, 15 and 30, the RNA was isolated for molecular assays. Using Affymetrix® Human Genome U219 Array, we found 2579 human transcripts that were differentially expressed in GCs. From these genes, we extracted 582 Gene Ontology Biological Process (GO BP) Terms and 45 KEGG pathways, among which we investigated transcripts belonging to four GO BPs associated with cell proliferation: "cell cycle phase transition", "G1/S phase transition", G2/M phase transition" and "cell cycle checkpoint". Microarray results were validated by RT-qPCR. Increased expression of all the genes studied indicated that increase in GC proliferation during long-term in vitro culture is orchestrated by the up-regulation of genes related to cell cycle control. Furthermore, observed changes in cell morphology may be regulated by a presented set of genes, leading to the induction of pathways specific for stemness plasticity and transdifferentiation in vitro.

Human Wharton's jelly mesenchymal stem cells: properties, isolation and clinical applications

Human Wharton’s jelly mesenchymal stem cells (WJ-MSCs) exhibit CD29, CD79 and CD105 markers, characteristic for mesenchymal cell lines. Under the influence of the appropriate factors, WJ-MSCs can be dedifferentiated to osteoblasts, chondrocytes, adipocytes, myocytes, cardiomyocytes, glial cells and dopaminergic neurons. Wharton’s jelly (WJ) is one of the potential sources of mesenchymal stem cells (MSCs) - obtaining these cells does not raise moral or ethical objections, because the umbilical cord (UC) is a regular waste material. The expression of the OCT-4 and Nanog proteins, which are characteristic for WJ-MSCs may indicate that these cells have retained some embryonic character. The collected data suggests that WJMSCs show increased division and telomerase activity compared to bone marrow MSCs (BM-MSCs). The published results showed no human leucocyte antigen (HLA) class II expression, with the possibility of HLA class I modification by WJ-MSCs, allowing for the transplantation of these cells both within the same and other species - which allows the use of human cells in animal models. The results of selected studies indicate that WJ-MSCs can be an essential element of regenerative medicine of the 21st century.

Enzyme linked receptor protein signaling pathway is one of the ontology groups that are highly up-regulated in porcine oocytes before in vitro maturation

Before being able to fully participate in the processes associated with its function as a female gamete, the oocyte needs to undergo a range of changes to achieve its mature form. These morphological, biochemical and metabolomic processes are induced by the somatic tissues surrounding the oocyte, through the expression of specific transcription and growth factors. The maturation of the oocyte is highly important for the proceedings that lead to successful fertilization, early embryonic development and implantation. Domestic pigs were used as models for our study, with the cumulus-oocyte complexes obtained from the ovaries that were recovered at slaughter. After shedding of the cumulus, oocytes were assessed with BCB test, with the viable ones chosen to undergo in vitro maturation. With the use of expression microarrays, we analyzed gene expression before and after IVM and detected major changes in both genes that were proven to be associated with oocyte maturation before (FOS, VEGFA, CHRDL1, TGFBR3, FST, INSR, ID1, TXNIP, SMAD4, MAP3K1, EIF2AK3 and KIT) and genes not previously linked with reproduction associated processes (MYO1E, PHIP, KLF10 and SHOC2). All the genes were briefly described, with consideration of possible involvement of the newly discovered elements of the transcriptome in the process of oocyte maturation.

Adhesions and endometriosis: challenges in subfertility management : (An expert opinion of the ANGEL-The ANti-Adhesions in Gynaecology Expert PaneL-group)

There is molecular evidence that endometriosis has a negative impact on the ovaries, although the exact pathophysiology concerning endometriosis-associated subfertility is not known. The negative impact on the tubo-ovarian unit can be directly by distorting the anatomy, indirectly by invoking inflammation or by oxidative damage with poorer-quality oocytes. Endometriosis even seems to have a negative effect on pregnancy outcome after in vitro fertilization.

QUANTITATIVE ANALYSIS OF CCR5 CHEMOKINE RECEPTOR AND CYTOCHROME P450 AROMATASE TRANSCRIPTS IN SWIM-UP SPERMATOZOA ISOLATED FROM FERTILE AND INFERTILE MEN

We determined the CCR5 chemokine receptor and cytochrome P450 aromatase (P450arom) transcript copies number in swim-up sperm isolated from fertile and infertile men. The ejaculates were purified by centrifugation through discontinuous Percoll density gradient and swim-up techniques. RNA was isolated from sperm, treated with DNase I and reverse-transcribed into cDNA. Quantitative analysis of CCR5 and P450arom cDNA were performed by real-time quantitative (RQ-PCR) SYBR Green I analysis. There was a higher content of CCR5 and P450arom transcripts copy number in swim-up sperm of fertile than from infertile donors. The decrease in CCR5 and P450arom transcripts in swim-up sperm may be associated with male infertility.

The highly conserved NANOS2 protein: testis-specific expression and significance for the human male reproduction

The highly conserved Nanos gene was found to encode a translational repressor necessary for germ-cell development in lower organisms. The mammalian homologue, Nanos2, was recently found to be expressed in the mouse germ cells. Since its disruption caused infertility exclusively in males, we sought to study the significance of this gene in human male reproduction. Here, we describe for the first time the expression pattern of the NANOS2 gene in human tissues and show that it is testis specific. We found that NANOS2 protein is present in prenatal germ cells and at later stages in spermatogenesis. To elucidate the role of NANOS2 in human germ-line development, we screened this gene for mutations in 214 males with isolated sterility and spermatogenic abnormalities. We identified two heterozygous variants, each in a different oligospermic patient, the second allele being the wild-type. The influence of the first variant, a missense mutation H68Q on the sterility phenotype, was not obvious since it was accompanied by a microdeletion within the AZF region of the Y chromosome. The second variant contained a silent mutation, H109H. Although both mutations were situated within the most conserved RNA-binding domain and were absent in 400 fertile males, it is not obvious that they cause male infertility.

Polymorphisms of the humanPUMILIO2 gene and male sterility

The highly conserved Pumilio protein plays crucial roles in fertility of many organisms acting as a repressor of translation, and causing infertility when mutated. Although one of two human Pumilio homologs, PUMILIO2 is expressed mainly in the germ line, its role in mammalian germ cell development has not been reported yet. To shed light on the role of PUMILIO2 in development of the human male germ line, we screened this gene for mutations in 137 patients presenting a variety of phenotypes with spermatogenic failure. The first variant, we identified was a single base substitution within intron 15 (IVS15 + 6G > A). This variant was found in three azoospermic males, the second allele being the wild type. However, this variant was also present among fertile males, as frequently as in the patients. Although location of IVS15 + 6G > A substitution in close proximity to the canonical donor splice site GT, indicates that its influence on splicing cannot be excluded, our preliminary cDNA analysis has not revealed evidence of a splicing abnormality of PUMILIO2 pre-mRNA carrying this variant. Nevertheless, this study provides new interesting variant containing a donor splice site variant, which can be relevant for understanding of splicing mechanism of mammalian genes. The second variant, c.774 C > T transversion (Y258Y) in exon 6 was found only in one patient, but an influence on PUMILIO2 function is not obvious. Altogether, this study shows that variation in the PUMILIO2 gene is very low and it seems improbable that mutations of this gene significantly contribute to male infertility in humans.

Predictive value of selected sperm parameters for classical in vitro fertilization procedure of oocyte fertilization

A proportion of fertilized oocytes during classical in vitro fertilization (IVF) procedure was analysed depending on the following factors: number of mature oocytes, seminological criteria such as sperm morphology in raw semen and after its selection in a density gradient (six structural defects of a male gamete were taken into consideration), sperm concentration, motility parameters according to World Health Organization criteria and the functional tests: hypo-osmotic swelling assay and acrosomal reaction induced by calcium ionophore. Evaluation of DNA content in sperm by image cytometry and determination of malonyldialdehydes in seminal plasma were also performed. Seventy-nine semen samples from patients undergoing IVF were assessed. Apart from significant correlations obtained for selected semen parameters and proportion of fertilized eggs, logistic regression analysis showed that the best predictive factors for oocyte fertilization were normal morphology of sperm before and after gradient selection, grade B and C of sperm movement in raw semen, and DNA content after density gradient centrifugation, which all accounted for 76.7% of fertilization predictive value.

Effect of sperm subpopulation's kinetics on human fertilization in vitro

The present study was carried out to investigate the relationship between sperm subpopulation kinetics on in vitro fertilization rate. The ability of human sperm to achieve fertilization oocytes was investigated in relation to particular motility parameters obtained on a computer aided sperm analysis system base. Analysis covers velocity straight linear (VSL), cross beat frequency (CBF), lateral head displacement (LHD) and homogeneity of progressive motility velocity (HPMV) of fresh semen and semen after density gradient selection. Investigation was based on sperm samples from 82 infertile couples undergoing IVF. Two subpopulations were extracted from each sample using the clustering method with respect to VSL parameter: a slow and rapid one. Comparison of obtained results before and after selection shows no significant change of subpopulations percentage. However, this method of selection strongly influences motility parameters of both subpopulations. There was found a positive correlation for VSL, LHD and HPMV and a negative correlation for CBF parameters found in slow fraction of fresh semen and percentage of fertilized oocytes. On the other hand, rapid subpopulation parameters for fresh semen and parameters found for both subpopulations in semen after selection did not correlate with one. This means that information of slow sperm subpopulation kinetics carries important prognostic value of IVF success. Since the current prognosis factors ignore motility parameters of slow sperms, our results show the importance of such an analysis.

Incidence of elevated LH/FSH ratio in polycystic ovary syndrome women with normo- and hyperinsulinemia

PURPOSE

The aim of this study was to determine the incidence of abnormal LH/FSH ratio in women with polycystic ovary with normo- and hyperinsulinemia and to assess the influence of elevated LH/FSH ratio on selected endocrine and biochemical parameters.

MATERIAL AND METHODS

One hundred nineteen polycystic ovary syndrome women in reproductive age hospitalized between 1996 and 2000 in Division of Infertility and Reproductive Endocrinology at Poznan University of Medical Sciences were selected for the study. In all selected women LH and FSH serum levels were determined and LH/FHS ratio was calculated. These groups became the subject of a detailed clinical, hormonal and metabolic analysis, which was performed between 6th and 10th day of a natural or induced menstrual period.

RESULTS

LH/FSH ratio greater than 2 was accepted as abnormal, and it was found in 54 women (45.4%; I group). Normal gonadotropin ratio was detected in 65 women (55%; group II). Statistically significant differences were noted between groups with normal and elevated LH/FSH ratio in the following parameters: BMI (body mass index), serum insulin, and LH levels. Further analysis revealed that the majority of women with elevated insulin concentrations belong to the group with normal LH/FSH ratio.

CONCLUSIONS

LH/FSH ratio is not a characteristic attribute of all PCOS women: in the present study this abnormality was detected in a subpopulation smaller than 50%. Most of the PCOS women with normal gonadotropin ratio belong to a group of patients suffering from hyperinsulinemia and obesity. Patients with hyperinsulinemia and excess of LH constitute a selected and distinct subgroup with increased adrenal androgenic activity.

[Importance of cytogenetic analysis in patients with azoospermia or severe oligozoospermia undergoing in vitro fertilization]

The karyotypic analysis was performed to assess the importance of genetic factor in male infertility. For that purpose, chromosomal analysis in blood lymphocytes was performed in 28 males, candidates for ICSI with azoospermia or severe oligozoospermia and in their spouses. Although chromosomal aberrations were identified in as many as 11 couples, (in 6 couples aberrations were identified in male, in 4 other couples in female partner, whereas in 1 one couple they were detected in both partners) their risk for potential offspring is unequal. Balanced autosomal aberrations detected in two males (7%) constitute a high risk since they can cause not only infertility but also severe somatic abnormalities if transferred as the unbalanced ones to the next generation. The remaining 9 chromosomal aberrations identified in this study were present in mosaic additional cell lines with low representation. In 8 of them sex chromosomes and in 1 an autosom were involved. Although these mosaic chromosomal aberrations can lower efficiency of in vitro fertilisation, the probability that they can be transferred to the next generation causing somatic abnormalities is not high. This study indicates that in case of azoospermia or severe oligozoospermia, the karyotypic analysis should be performed in both partners prior to in vitro fertilisation.

[Comparison of the frequency of selected gynecologic operations conducted as laparotomy and laparoscopy during 1993-1997]

The aim of the study was to compare frequency of four gynecological operations: myomectomy, tubal surgery, cystectomy and operative management of ectopic pregnancy, performed by laparotomy or laparoscopy, by the same team of surgeons. In the years 1994-1997 in Division of Reproduction Poznań University Medical School 647 cystectomies, 208 myomectomies, 68 tuboplasties and 50 surgical treatments of ectopic pregnancy were done. Among 973 operations--684 (70.3%) were performed by laparoscopy. There was a gradual tendency in increasing endoscopic procedures. Comparing the year 1994 and 1997 percentage of operations performed by laparoscopy significantly changed: In tuboplasty from 83% to 95%, cystectomy from 35.9% to 80.3%, ectopic pregnancy from 61.5% to 91.7% and myomectomy from 52.7% to 61.5%. Patient hospital stay decreased significantly after laparoscopic procedures (from 5.1 days to 3.25 days). During the study period open surgery followed laparoscopy only in 8 cases (1.1%) because of complications or technical difficulties.

CONCLUSION

1. Operative laparoscopy is a safe and effective procedure, in many cases replacing open surgery. 2. Shortening of hospital stay and recovery period after laparoscopy is one of the main advantages of this method of treatment.

Metformin therapy decreases hyperandrogenism and hyperinsulinemia in women with polycystic ovary syndrome

OBJECTIVE

To evaluate the effects of 12 weeks of metformin therapy on hormonal and clinical indices in polycystic ovary syndrome (PCOS).

DESIGN

Prospective study.

SETTING

University hospital.

PATIENT(S)

Thirty-nine women with PCOS and fasting hyperinsulinemia.

INTERVENTION(S)

Twelve weeks of therapy with oral metformin (500 mg three times per day).

MAIN OUTCOME MEASURE(S)

Levels of insulin, T, DHEAS, insulin-like growth factor-I (IGF-I), gonadotropins, and sex hormone-binding globulin (SHBG); and clinical symptoms including acne, hirsutism, and length of the menstrual cycle were assessed before and after treatment with metformin.

RESULT(S)

Metformin therapy resulted in a significant decrease in fasting insulin and total T and an increase in SHBG, leading to a decrease in the free T index. In addition, there was a significant decline in mean body mass index, waist-hip ratio, hirsutism, and acne, as well as an improvement in the menstrual cycle. No changes in LH and LH-FSH ratio were observed. Multiple regression analysis demonstrated that the greatest decline of T and free T index in response to metformin was observed among patients with the most pronounced hyperandrogenemia. Subjects with elevated DHEAS differed from those with normal DHEAS in their responses to metformin treatment. Women with high DHEAS exhibited less improvement of menstrual cycle regularity, no change in hirsutism, and an increase in levels of IGF-I after treatment.

CONCLUSION(S)

Metformin treatment of women with PCOS results in a decline of insulin as well as total and bioavailable T, leading to significant improvement of clinical manifestations of hyperandrogenism. Responses to metformin are related to the severity of hyperandrogenemia and to adrenal function.

[Laparoscopic myomectomy]

OBJECTIVES

The aim of our study was clinical analysis of the factors influencing on laparoscopic myomectomy.

STUDY DESIGN

Retrospective analysis of the operative protocols.

MATERIAL AND METHODS

Two hundred nineteen women had laparoscopy because of unexplained infertility (n = 109) unexplained infertility and myomas (n = 41), myomas (n = 36), endometriosis suspicion (n = 20) ovarian cyst (n = 9) or pelvic pain syndrome (n = 4).

RESULTS

Among 299 myomas 186 were extirpated during laparoscopy. In 39 cases suturing of the myometrium was necessary. Electrocautery was performed in 27 cases and laser-vaporisation in 8. In 28 women the operation was postponed because of small myomas and mainly poor operative technique (beginning of the learning curve). In two of them second laparoscopy was performed after GnRH therapy. An analysis of the factors which enable laparoscopic myomectomy was performed. The most important factors are: size and number of the myomas, localization in the myometrium, experienced hands and operative room equipment.

CONCLUSIONS

Uterine myomas are one of the indications to operative laparoscopy. Meticulous analysis of the operative conditions as well as the assessment of the team experience should always precede laparoscopy.

[The influence of FSH stimulation on the results of intrauterine insemination]

OBJECTIVE

To compare the efficacy of IUI husband in natural versus FSH stimulated cycles.

DESIGN

Prospective, controlled study.

MATERIALS AND METHODS

IUI were performed in 57 infertile couples with natural cycles, and in 16 under FSH and GnRH stimulation (Short protocol). In stimulated patients also hCG and hydrogesteron were given. Indication in both groups was idiopathic infertility. Duration of infertility and the age were comparable. Semen preparation and ovarian monitoring were the same in 2 groups.

RESULTS

Three pregnancies in 57 natural IUI cycles (5.3%) and 5 out of 16 cycles in stimulated women (31.2% per cycle-with one triple pregnancy).

CONCLUSION

In couples with idiopathic infertility FSH stimulation significantly increases rate of pregnancy and multiple gestation.