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Vitreous levels of luteinizing hormone and VEGF are strongly correlated in healthy mammalian eyes.

Purpose/Aim: Luteinizing hormone (LH) is known to function as a key regulator of VEGF expression in reproductive organs. In recent years, LH has also been detected in human vitreous and LH receptors have been identified in human retina. This study was aimed to investigate a potential correlation between LH and VEGF levels in healthy mammalian eyes to provide supporting evidence of LH's potential involvement in intraocular VEGF regulation.

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Increased Level of c-kit in Semen of Infertile Patients with Varicocele.

Varicocele is the most common risk factor for male infertility, however, not all males with varicocele experience infertility. In fact, most patients with varicocele have normal spermatogenesis. The molecular mechanism of varicocele-associated infertility is yet to be completely understood. The aim of this study is to assess the association of a number of fertility regulatory factors on varicocele associated infertility and to throw light on the mechanism of varicocele-associated infertility.

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Serum Stem Cell Factor Assay in Elderly Poor Responder Patients Undergoing IVF: A New Biomarker to Customize Follicle Aspiration Cycle by Cycle.

In humans, stem cell factor (SCF), produced during follicular phase, may reflect a successful stimulation and oocyte maturation and so it may be a predictor of in vitro fertilization (IVF) outcome. An observational cohort study was conducted on 37 poor responders scheduled for fresh nondonor IVF/intracytoplasmic sperm injection treatment with standard controlled ovarian stimulation (COS) using recombinant follicle-stimulating hormone (rFSH; S-COS group). A total of 35 women received a second treatment using both rFSH and recombinant luteinizing hormone (rLH; LH-COS group). From 144 samples collected at pickup day, serum concentration of SCF (s-SCF) and follicular levels of SCF (f-SCF) were measured by enzyme-linked immunosorbent assay (ELISA) kit. No differences were observed between the 2 protocols in terms of both f-SCF and s-SCF levels. The comparison between f-SCF and s-SCF levels showed a strong linear correlation. The comparison between s-SCF levels and clinical outcomes showed a statistically significant correlation between both the number of metaphase II (MII) oocytes retrieved and the embryos obtained after fertilization. Cases with at least 3 MII oocytes showed s-SCF values >800 pg/mL, 2 MII oocytes >600 pg/mL, and 1 MII oocytes >400 pg/mL. In 100% of cases with s-SCF <400 pg/mL, no MII oocytes were recovered. All 5 pregnancies occurred in patients with s-SCF values >1000 pg/mL. The introduction of s-SCF assay in the management of poor-responder patients may contribute to solving the dilemma of whether to cancel or proceed with the stimulation cycle.

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[Estimation of ovarian response using multiple predictors of ovarian reserve in women undergoing in vitro fertilization-embryo transfer].

To analyze the value of ovarian reserve markers for predicting ovarian response in women undergoing in vitro fertilization-embryo transfer.

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Assessment of di (2-ethylhexyl) phthalate exposure by urinary metabolites as a function of sampling time.

In most DEHP exposure assessment studies, single spot urine sample was used. It could not compare the exposure level among studies. Therefore, we are going to represent the necessity of selection of proper sampling time of spot urine for assessing the environmental DEHP exposure, and the association urinary DEHP metabolites with steroid hormones.

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Serum steroids concentration might be used for monitoring the growth of follicles in friendly fertilization.

Steroid levels have been used as the predictive parameters for oocyte maturation and embryo development. In the present study, estradiol and progesterone concentrations in the follicular fluid and serum were evaluated in conventional fertilization (IVF; follicle stimulating hormone [FSH] and/or human menopausal gonadotropin [hMG] after pituitary desensitization) and friendly IVF (no stimulation, clomiphene citrate, small dose of FSH or hMG without pituitary desensitization). The purpose of the present study was to evaluate the differences in steroid distribution between conventional and friendly IVF. Concentrations of estradiol, progesterone, FSH, and luteinizing hormone (LH) in serum and follicular fluid were determined in conventional and friendly IVF protocols by an enzyme-linked immunosorbent assay kit. Correlations between follicular fluid and serum steroid concentrations in these different protocols, and between pregnant cycles and steroid concentrations were evaluated. Two hundred and thirty-four samples of follicular fluid from 74 IVF patients were analyzed. In conventional IVF, there was no relationship in steroid levels in between follicular fluid and serum steroids, whereas serum steroid concentrations correlated with the number of developing follicles. There was a relationship between the serum and follicular fluid estradiol levels ( = 0.467,  < 0.0001) as well as progesterone levels ( = 0.227,  = 0.0488) from friendly IVF patients. Serum steroid concentrations were mainly associated with the number of developing follicles. In the cases of friendly IVF, which had a small number of developing follicles, serum steroids might be used to monitor follicular fluid steroid concentrations. (Reprod Med Biol 2006; : 277-282).

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Inhibin A concentrations in the sera of young women during and after chemotherapy for lymphoma: correlation with ovarian toxicity.

Inhibin A concentrations in serum may reflect the ovarian granulosa cell compartment. To characterize the correlation between ovarian function after gonadotoxic chemotherapy for Hodgkin's or non-Hodgkin's lymphoma in young women, the immunoreactive inhibin A concentrations in the sera of these patients was measured before, during, and after the gonadotoxic chemotherapy.

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[Clinical evaluation of enantone in the treatment of prostate cancer].

In order to improve the effect of hormone treatment for prostate cancer, a total of 17 such patients were treated with Enantone(chemical castration) from July 1990 to July 1992.

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Does early growth delay occur in diabetic pregnancy?

To identify the date of ovulation in pregnant women with Type 1 diabetes in order to assess the validity of the concept of early growth delay.

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European collaborative study of luteinizing hormone assay: 1. Epitope specificity of luteinizing hormone monoclonal antibodies and surface mapping of pituitary and urinary luteinizing hormone.

This report describes the results of the first part of the collaborative study organized by a working group sponsored by the Community Bureau of Reference of the European Community Commission. The whole study was designed to understand the causes of discrepancy among LH immunoassay methods. In the parent work, we studied the characteristics of 55 monoclonal antibodies to LH which allowed us to establish a detailed map of the antigenic surface of the hormone. In the present report we used this information to interpret the discrepancy in LH concentrations assayed with 12 different methods in 300 sera from subjects with various clinical conditions. The 55 monoclonal antibodies provided by 11 commercial companies were tested in various experiments: the apparent affinity of the antibodies was, generally but not always, higher for LH presented by a second antibody coated to plastic than for LH directly coated to plastic; 26% of the antibodies recognized the alpha subunit, 26% the beta subunit and 48% reacted only with the holomolecule (anti-alpha beta); only 28% of the antibodies were strictly specific for LH. Criss-cross experiments allowed us to distinguish 13 antigenic regions on the surface of LH: 6 were located on the alpha subunit, 3 on the beta subunit and 4 on the holomolecule. The monoclonal antibodies to the alpha beta regions further separated into 12 clusters of reactivity. Accordingly, LH appeared to exhibit at least 21 epitopes. Comparison of the immunoreactivity of various LH preparations indicated that highly purified pituitary LH and immunoaffinity purified urinary LH reacted similarly with the monoclonal antibodies and strongly differed from crude urinary LH. These data indicated that the immunoreactivity of an LH preparation depends mainly upon the degree of purification and not that much upon the origin of the preparation. The epitope specificity of the monoclonal antibodies used in 11 commercially available LH assay kits was also determined: 10 kits used at least one anti-alpha beta monoclonal antibody associated with an anti-beta monoclonal antibody in 7 cases or another anti-alpha beta monoclonal antibody in 3 cases; one kit used an anti-alpha monoclonal antibody associated with an anti-beta monoclonal antibody. None of the kits were strictly identical with regards to the epitope specificity of the monoclonal antibodies used.

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