RESUMEN
PURPOSE: Case studies of four in vitro fertilization (IVF) cycles where embryo transport by commercial airline followed by biopsy and genetic analysis with subsequent culture to Day 5 and resulting ongoing pregnancy. METHOD: Retrospective clinical case study of 4 patients requiring preimplantation genetic diagnosis (PGD) testing. Normally fertilized embryos were transported in a battery-powered portable incubator by commercial airline following evaluation for fertilization under controlled conditions from the Center for Assisted Reproduction, Bedford, Texas to the Reproductive Genetic Institute, Chicago, Illinois. Following Day 3 embryo biopsy and genetic analysis, embryos were transported back to the Center for Assisted Reproduction for Day 5 embryo transfer. RESULTS: Ongoing clinical pregnancy resulted for all patients receiving embryo transfer. CONCLUSION: These results demonstrate the feasibility of embryo transport by air for centers that do not have the in-house capabilities to perform genetic analysis. With successful pregnancies obtained through extended culture to Day 5, embryos requiring genetic analysis can be successfully transported by air, tested, and returned to the initial facility for embryo transfer without time restriction.
Asunto(s)
Transferencia de Embrión , Pruebas Genéticas , Transportes , Adulto , Aviación , Estudios de Factibilidad , Femenino , Fertilización In Vitro , Humanos , Embarazo , Resultado del Embarazo , Estudios Retrospectivos , Factores de TiempoRESUMEN
In order to evaluate the niche of extended embryo culture in an IVF programme, retrospective analysis of non-selected IVF patients, who underwent ovarian stimulation from April 1998 to June 1999 in a single private practice assisted reproductive technology centre, was performed. Embryos were cultured for 48 h in S1/G1.2 medium followed by 48 to 72 h of culture in S2/G2.2 to day 5 or day 6. Only fertilized oocytes exhibiting two pronuclei from donor and non-donor IVF and intracytoplasmic sperm injection (ICSI) cases were examined to determine the relationship between embryo cell number on day 3 and subsequent rate of blastocyst formation. Results indicated that a proportional relationship existed between the number of blastomeres present in day 3 embryos and the rate of blastocyst formation. Fifty-four per cent of embryos that had six cells on day 3 formed blastocysts, while 76% of those embryos with eight cells formed blastocysts. Blastocyst development did not increase further when embryos had more than eight cells on day 3, indicating that embryos with greater cell numbers on day 3 are not always predictive of a greater likelihood of blastocyst formation. Fertilized oocytes exhibiting two pronuclei from donors produced significantly more blastocysts (67%) than those from IVF patients (52%; P < 0.01), and had a significantly higher implantation rate (54%) compared with IVF patients (30%; P < 0.01). Furthermore, blastocyst cryopreservation resulted in significantly higher implantation rates than cryopreserved cleavage stage embryos (P < 0.001).
Asunto(s)
Embrión de Mamíferos/fisiología , Técnicas Reproductivas , Blastocisto/fisiología , Blastómeros/fisiología , Criopreservación , Medios de Cultivo , Técnicas de Cultivo , Implantación del Embrión , Transferencia de Embrión , Femenino , Fertilización In Vitro , Humanos , Edad Materna , Inducción de la Ovulación , Embarazo , Embarazo de Alto Riesgo , Estudios Retrospectivos , Inyecciones de Esperma Intracitoplasmáticas , Factores de TiempoRESUMEN
OBJECTIVE: To evaluate the nonselective application of extended embryo culture on the outcome of IVF. DESIGN: Retrospective analysis. SETTING: Private practice assisted reproductive technology center. PATIENT(S): Seven hundred ninety nonselected patients undergoing IVF with controlled ovarian stimulation. INTERVENTION(S): For day 3 ET, multicell embryos were cultured in human tubal fluid medium and 12% synthetic serum substitute. For day 5 ET, embryos were cultured for 48 hours in S1 medium and then for 48 hours in S2 medium. MAIN OUTCOME MEASURE(S): Implantation rate (determined by total no. of visualized gestational sacs), ongoing pregnancy rate, and number of embryos available for ET. RESULT(S): Respective day 3 and day 5 implantation rates for patients aged <35 years (29.5% and 38.9%), patients aged 35-39 years (20.7% and 28.2%), and all patients combined (23.3% and 32.4%) were statistically significantly different. Significantly more embryos were transferred on day 3 than on day 5 for patients aged <35 years (2.9 vs. 2.4), patients aged 35-39 years (3.1 vs. 2.6), and all patients combined (3.0 vs. 2.5). The difference in ongoing pregnancy rates per retrieval was statistically significant for day 3 compared with day 5 transfers for all patients combined (35.9% vs. 43.8%). Cancellation rates for transfer after retrieval increased significantly for day 3 compared with day 5 transfer (2.9% vs 6.7%). CONCLUSION(S): These results demonstrate the feasibility of using extended embryo culture in a nonselective manner for couples undergoing IVF. Overall, extended embryo culture was associated with a significant increase in pregnancy rates and implantation rates and a significant decrease in the number of embryos transferred. The rate of multiple implantation among patients aged <35 years warrants consideration of single blastocyst transfers for this group.
Asunto(s)
Blastocisto/fisiología , Transferencia de Embrión , Fertilización In Vitro , Adulto , Medio de Cultivo Libre de Suero , Técnicas de Cultivo , Femenino , Humanos , Edad Materna , Embarazo , Embarazo de Alto Riesgo , Pronóstico , Estudios Retrospectivos , Resultado del TratamientoRESUMEN
Male pseudohermaphrodites require gonadectomy for the prevention of gonadal malignancy. Laparoscopic gonadectomy has been performed in patients with intra-abdominal gonads and can also be performed in patients whose gonads are located within the inguinal canals.
Asunto(s)
Trastornos del Desarrollo Sexual/cirugía , Conducto Inguinal , Orquiectomía , Testículo/cirugía , Adulto , Humanos , Laparoscopía , Masculino , Neoplasias Testiculares/prevención & controlRESUMEN
In the present study, we examined the changes in enzyme activity and mRNA levels of aromatase cytochrome P450 (P450AROM) and 5 alpha-reductase in ovarian tissue from adult cyclic rats. For each stage of the estrous cycle, the enzymatic activities were quantified by means of the 3H2O-release assay in the case of P450AROM and thin-layer chromatography in the case of 5 alpha-reductase. Levels of mRNA encoding P450AROM and 5 alpha-reductase in the ovary were determined by Northern blot analysis utilizing 32P-labeled rat cDNAs as probes. Serum LH levels were determined by RIA. Three P450AROM mRNA species were detected (at 1.7, 2.2 and 2.7 kb) in ovarian tissue from cyclic rats. All three P450AROM transcripts were expressed in a co-ordinated fashion throughout the cycle. The P450AROM levels were highest during diestrus and proestrus, decreased during estrus while at metestrus the levels were nearly nondetectable. Conversely, one 5 alpha-reductase mRNA species at 2.5 kb was detected in ovarian tissue from cyclic animals. Ovarian 5 alpha-reductase mRNA levels were lowest during diestrus and proestrus, increased at estrus and were most abundant during metestrus; a pattern opposite to that of P450AROM. The pattern of change in P450AROM and 5 alpha-reductase activities paralleled that of the respective mRNA profiles but lagged behind the mRNA profiles by about 24 h, or one stage of the estrous cycle. Aromatase activity was 1.5 pmol/h/mg protein during diestrus, increased over 3-fold at proestrus (approximately 5.5 pmol/h/mg protein), decreased at estrus and declined to the lowest values at metestrus (approximately 1.0 pmol/h/mg protein). In contrast, the 5 alpha-reductase activity pattern was essentially the mirror image of the P450AROM activity pattern during the estrous cycle. 5 alpha-Reductase levels were lowest during proestrus (approximately 5 pmol/h/mg protein) and estrus (approximately 8 pmol/h/mg protein), increased over 3-fold during metestrus, while the highest activity levels occurred during diestrus (approximately 36 pmol/h/mg protein). The normalization of the P450AROM and 5 alpha-reductase mRNA levels and their respective enzyme activities revealed a correspondence between mRNA abundance and subsequent increases (24 h later) in enzyme activity levels during the estrous cycle. These findings suggest that: (a) a temporal relationship exists between the profiles of the enzymatic activities that follows the changes in the levels of their respective mRNAs and (b) an inverse pattern exists between P450AROM and 5 alpha-reductase in terms of both enzymatic activity and mRNA expression during the estrous cycle in rat.
Asunto(s)
3-Oxo-5-alfa-Esteroide 4-Deshidrogenasa/metabolismo , Aromatasa/metabolismo , Estro/fisiología , Ovario/enzimología , ARN Mensajero/metabolismo , 3-Oxo-5-alfa-Esteroide 4-Deshidrogenasa/genética , Animales , Aromatasa/genética , Secuencia de Bases , ADN , Femenino , Hormona Luteinizante/sangre , Datos de Secuencia Molecular , Ratas , Ratas EndogámicasRESUMEN
We have examined the levels of expression of mRNA species encoding cholesterol side-chain cleavage cytochrome P-450 (P-450scc), 17 alpha-hydroxylase cytochrome P-450 (P-450(17 alpha), aromatase cytochrome P-450 (P-450AROM) and 3 beta-hydroxysteroid dehydrogenase (3 beta-HSD) in rat ovaries throughout the oestrous cycle, during pregnancy and in immature animals treated with pregnant mare serum gonadotrophin (PMSG). Total or poly(A)(+)-enriched RNA was prepared from adult rat ovaries throughout the oestrous cycle, from immature rat ovaries 24 and 48 h after treatment and from adult rat ovaries on days 10, 14, 17 and 21 of gestation. Expression of the mRNA species was examined by Northern analysis using specific [32P]cDNA probes. During the oestrous cycle P-450scc mRNA of approximately 1.9 kb was detected at low levels, while 3 beta-HSD mRNA of 1.7 kb was in relatively high abundance throughout the oestrous cycle. While P-450(17) alpha mRNA of 1.9 kb and P-450AROM of 2.7, 2.2 and 1.7 kb were highly abundant during dioestrus, pro-oestrus and oestrus, the levels of these mRNA species decreased markedly to be nearly undetectable during metoestrus. During pregnancy there was considerably more variation in the expression of the mRNA species examined. Expression of P-450scc mRNA was at low, but detectable, levels until day 14, thereafter expression increased to high levels (day 14-21 of gestation). Levels of P-450(17) alpha mRNA on day 10 of gestation were lower than at pro-oestrus during the oestrous cycle and decreased further on days 14 and 17. Expression of 3 beta-HSD was decreased on day 10, but on days 14, 17 and 21 of gestation high mRNA levels were detectable. Ovarian expression of the three P-450AROM species was dramatically increased between days 14 and 17 of pregnancy, but declined by day 21. In immature rats, P-450scc mRNA was detected at low levels in unstimulated animals and increased markedly after treatment with PMSG, while subsequent treatment with human chorionic gonadotrophin (hCG) had a minimal effect on expression. Expression of P-450(17) alpha mRNA was high in unstimulated immature and PMSG-treated rats, but diminished after treatment with hCG. All three P-450AROM mRNA species were undetectable in ovaries from unstimulated immature animals; however, induction of all three was observed in PMSG-treated rats, but this expression decreased to undetectable levels upon subsequent administration of hCG.(ABSTRACT TRUNCATED AT 400 WORDS)
Asunto(s)
3-Hidroxiesteroide Deshidrogenasas/genética , Aromatasa/genética , Enzima de Desdoblamiento de la Cadena Lateral del Colesterol/genética , Estro/metabolismo , Preñez/metabolismo , ARN Mensajero/metabolismo , Esteroide 17-alfa-Hidroxilasa/genética , Esteroides/biosíntesis , Animales , Northern Blotting , Femenino , Expresión Génica , Poli A/genética , Poli A/aislamiento & purificación , Embarazo , Progesterona/sangre , ARN/genética , ARN/aislamiento & purificación , ARN Mensajero/genética , Ratas , Maduración SexualRESUMEN
The levels of expression of mRNA species encoding cholesterol side-chain cleavage cytochrome P-450 (P450scc), 17 alpha-hydroxylase cytochrome P450 (P450(17 alpha], aromatase cytochrome P-450 (P-450AROM), and 3 beta-hydroxysteroid dehydrogenase (3 beta HSD) were examined in human follicles and corpora lutea (CL) throughout the menstrual cycle. Tissues were obtained from women undergoing hysterectomy and oophorectomy. The largest follicle or the CL was dissected from the ovary depending on whether the surgery was performed in the follicular or luteal phase. The day of the cycle was determined by onset of last menstrual period and was confirmed by endometrial histology. Total RNA was examined by Northern blot analysis, using as probes specific 32P-labeled cDNA inserts encoding each human enzyme. Early follicles demonstrated detectable mRNA for both P450scc and P450(17 alpha), but not for P450AROM or 3 beta HSD. P450AROM was detectable late in the follicular phase and appeared markedly induced in the CL. 3 beta HSD was detectable only in the CL. Levels of P450(17 alpha) mRNA remained relatively unchanged throughout the cycle, whereas P450scc mRNA levels were greatly increased in the CL. The presence of P450(17 alpha) mRNA in the human CL is of interest, since it is absent from the bovine CL, and this is consistent with the ability of the human, but not the bovine, CL to synthesize 17 alpha-hydroxyprogesterone and estrogens. The fact that P450AROM expression is highest in CL is surprising, since plasma estrogen levels are highest during the late follicular phase of the cycle, and may suggest that CL estrogen biosynthesis is limited by 17 alpha-hydroxylase or 17,20-lyase activities.
Asunto(s)
3-Hidroxiesteroide Deshidrogenasas/genética , Aromatasa/genética , Enzima de Desdoblamiento de la Cadena Lateral del Colesterol/genética , Cuerpo Lúteo/enzimología , Regulación Enzimológica de la Expresión Génica , Ciclo Menstrual , Folículo Ovárico/enzimología , ARN Mensajero/aislamiento & purificación , Esteroide 17-alfa-Hidroxilasa/genética , Esteroide Hidroxilasas/genética , Adulto , Northern Blotting , ADN/aislamiento & purificación , Estrógenos/biosíntesis , Femenino , Humanos , Técnicas de Sonda Molecular , Progesterona/biosíntesisRESUMEN
The placenta has been shown to be the major source of estrogen production during pregnancy. This investigation was undertaken to compare the content and activity of aromatase in the placenta and various other human fetal tissues. Tissues were obtained from first- and second-trimester human abortuses. The amount of aromatase P-450 (aromatase cytochrome P-450) in tissue homogenates was determined after sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblotting by use of a polyclonal antibody directed against aromatase cytochrome P-450. The activity of aromatase in microsomal preparations was assayed by determining the rate of incorporation of tritium from 1-[3H]androstenedione into [3H]water. The greatest amount of aromatase cytochrome P-450 (55 kd) was detected in placenta and lesser amounts were detected in other tissues. Aromatase activity also was highest in placental microsome fractions (368 +/- 62.4 pmol/mg/hr [mean +/- SE], n = 9). A significant amount of aromatase activity was also detected in fetal liver (19 +/- 4.8 pmol/mg/hr, n = 7). Much less activity was found in brain (2.8 +/- 1.0 pmol/mg/hr, n = 6) and intestine (2.7 +/- 1.3 pmol/mg/hr, n = 7). Minimal activity was noted in adrenal (n = 5), spleen (n = 4), stomach (n = 4), and muscle (n = 5) (1.2 to 1.5 pmol/mg/hr). Activity in kidney (n = 7), heart (n = 4), and lung (n = 4) was extremely low (less than 0.8 pmol/mg/hr). In conclusion, the placenta is a major site of conversion of C19 steroid precursors to estrogens because of the amount of enzyme and the high rate of activity of aromatase compared with those of other fetal tissues. However, considering the size and rate of aromatase activity in other fetal tissues such as liver, brain, and intestine, these tissues also may contribute to the total estrogen production in the fetal-placental unit.
Asunto(s)
Aromatasa/metabolismo , Feto/enzimología , Electroforesis en Gel de Poliacrilamida , Estrógenos/metabolismo , Femenino , Feto/metabolismo , Humanos , Immunoblotting , Placenta/enzimología , EmbarazoRESUMEN
To evaluate the potential benefit of recombinant tissue plasminogen activator (rt-PA) as an agent for reducing postoperative adhesions, a rabbit uterine horn model was studied. Fifty-five rabbits underwent laparotomy, at which time the uterus was abraded with scalpel and a thermal injury was induced with electrocautery. Before abdominal closure, rt-PA was applied topically in various dosages. Adhesions were evaluated at a second laparotomy performed 2 weeks later. Treatment significantly reduced both adhesion quantity (P less than 0.001) and adhesion density (P less than 0.001). In the second phase of the study, the efficacy of rt-PA as an adjunct to surgical adhesiolysis was investigated. Again, a dose-related treatment effect was observed (P less than 0.001). No wound healing or bleeding complications were seen.
Asunto(s)
Enfermedades Peritoneales/prevención & control , Complicaciones Posoperatorias/prevención & control , Activador de Tejido Plasminógeno/uso terapéutico , Útero/cirugía , Animales , Femenino , Enfermedades Peritoneales/etiología , Enfermedades Peritoneales/patología , Complicaciones Posoperatorias/patología , Conejos , Proteínas Recombinantes/uso terapéutico , Adherencias Tisulares/etiología , Adherencias Tisulares/patología , Adherencias Tisulares/prevención & controlRESUMEN
When intravenous magnesium sulfate is infused in women with pregnancy-induced hypertension, the hypermagnesemia does not result in lower Apgar scores. The mean maternal serum and cord magnesium levels at delivery were 5.3 +/- 0.72 and 5.3 +/- 1.1 mEq/dl, respectively. The most common negative Apgar score was assigned for color, not for muscle tone.