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1.
Reprod Biomed Online ; 49(3): 103913, 2024 Mar 02.
Artigo em Inglês | MEDLINE | ID: mdl-38897134

RESUMO

RESEARCH QUESTION: Is there any association between pelvic pain and primary caesarean delivery for patients undergoing assisted reproductive technology (ART) treatment? DESIGN: Retrospective cohort study of nulliparous patients with singleton pregnancies who underwent ART treatment and achieved a live birth between 2012 and 2020. Cases included patients diagnosed with pelvic pain. A 3:1 ratio propensity-score-matched population of patients without a history of pelvic pain was included as the control group. Comparative statistics were performed using chi-squared test and Student's t-test. A multivariate regression analysis was conducted to evaluate the association between pelvic pain and mode of delivery. RESULTS: One hundred and seventy-four patients with pelvic pain were compared with 575 controls. Patients with pelvic pain reported a significantly longer duration of infertility compared with controls (18.98 ± 20.2 months versus 14.06 ± 14.06 months; P = 0.003). Patients with pelvic pain had a significantly higher rate of anxiety disorders (115 ± 21.9 versus 55 ± 31.6; P = 0.009) and use of anxiolytics at embryo transfer (17 ± 3.2 versus 12 ± 6.9; P = 0.03) compared with controls. In addition, patients with pelvic pain had a higher rate of primary caesarean delivery compared with controls (59.8% versus 49.0%; P = 0.01). After adjusting for multiple variables, a significant association was found between pelvic pain and increased odds of primary caesarean delivery (adjusted OR 1.48, 95% CI 1.02-2.1). CONCLUSION: Patients with pelvic pain have significantly higher odds of primary caesarean delivery compared with patients without a history of pelvic pain. The infertility outpatient setting may be uniquely positioned to identify patients at risk for undergoing primary caesarean delivery, and could facilitate earlier intervention for pelvic floor physical therapy during the preconception and antepartum periods.

2.
Transgend Health ; 9(1): 76-82, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-38312448

RESUMO

Purpose: Transgender and gender diverse (TGD) individuals continue to face adversity, stigma, and inequality, especially in health care. This study aimed to characterize the experience of TGD people and partners of TGD people with regard to fertility treatment. Methods: All TGD patients presenting to a single academic center between 2013 and 2021 were included. Baseline demographics collected included patient age, body mass index, anti-Mullerian hormone, basal antral follicle count, history of gender-affirming surgery, and/or gender-affirming hormone therapy. Outcomes included total patients who progressed to treatment, cycle type(s), and clinical outcomes. Results: In total, 82 patients who identified as TGD or had a partner who identified as TGD presented to care seeking fertility treatment. Of the 141 planned cycles, 106 (75.2%) progressed to treatment. Of the 15 in vitro fertilization (IVF) and co-IVF cycles, 12 achieved live birth. Of the 76 intrauterine inseminations 7 patients were discharged with ongoing pregnancies and one achieved live birth. Conclusion: These findings reaffirm that TGD individuals utilize the entire array of fertility services. With recent advances in access to care and modern medicine, assisted reproductive technology treatment has the power to support TGD patients in building contemporary family structures.

3.
JBRA Assist Reprod ; 25(4): 586-591, 2021 10 04.
Artigo em Inglês | MEDLINE | ID: mdl-34542251

RESUMO

OBJECTIVE: To investigate the association between cleavage stage development, embryonic competence, and euploidy in patients undergoing in vitro fertilization (IVF) with subsequent next generation sequencing. METHODS: The retrospective cohort study included patients at an academic fertility center who underwent IVF with at least one cleavage stage embryo from 2016 to 2019. Embryos were analyzed as slow (<6 cells), intermediate (6-8 cells), or fast (>8 cells); day 3 cell count was also analyzed as a continuous variable. Primary outcomes were blastulation rate, biopsied blastocyst rate, and euploid rate. Odds of blastulation, biopsy, and euploidy were also calculated. Additionally, we modeled the predicted probability of an embryo reaching blastulation, biopsy, and euploidy based on cleavage stage development. RESULTS: When compared with intermediate and slow cohorts, fast cleaving embryos had significantly higher rates of blastulation (82.70% vs. 75.13 vs. 42.48%), biopsy (55.04% vs. 44.00% vs. 14.98%), and euploidy (50.65% vs. 47.93% vs. 48.05%). After adjustment for covariates, there was a significant association between cleavage stage development and odds of blastulation (OR 1.38, 95% CI 1.29-1.48), biopsy (OR 1.42, 95% CI 1.34-1.51), and euploidy (OR 1.08, 95% CI 1.01-1.17). Finally, we observed significant associations between cleavage stage development and predicted probability of reaching blastulation (OR 1.29, 95% CI 1.27-1.32), biopsy (OR 1.24, 95% CI 1.22-1.26), and euploidy (OR 1.02, 95% CI 1.01-1.04). CONCLUSIONS: Cleavage stage embryos with greater mitotic activity perform as well as or better than intermediate or slower cleaving embryos. Rapidly cleaving embryos have high rates of euploidy and significant clinical potential.


Assuntos
Diagnóstico Pré-Implantação , Blastocisto , Implantação do Embrião , Feminino , Fertilização , Fertilização in vitro , Sequenciamento de Nucleotídeos em Larga Escala , Humanos , Gravidez , Taxa de Gravidez , Estudos Retrospectivos
4.
J Assist Reprod Genet ; 38(7): 1647-1653, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-33932196

RESUMO

PURPOSE: To assess whether utilization of a mathematical ranking algorithm for assistance with embryo selection improves clinical outcomes compared with traditional embryo selection via morphologic grading in single vitrified warmed euploid embryo transfers (euploid SETs). METHODS: A retrospective cohort study in a single, academic center from September 2016 to February 2020 was performed. A total of 4320 euploid SETs met inclusion criteria and were included in the study. Controls included all euploid SETs in which embryo selection was performed by a senior embryologist based on modified Gardner grading (traditional approach). Cases included euploid SETs in which embryo selection was performed using an automated algorithm-based approach (algorithm-based approach). Our primary outcome was implantation rate. Secondary outcomes included ongoing pregnancy/live birth rate and clinical loss rate. RESULTS: The implantation rate and ongoing pregnancy/live birth rate were significantly higher when using the algorithm-based approach compared with the traditional approach (65.3% vs 57.8%, p<0.0001 and 54.7% vs 48.1%, p=0.0001, respectively). After adjusting for potential confounding variables, utilization of the algorithm remained significantly associated with improved odds of implantation (aOR 1.51, 95% CI 1.04, 2.18, p=0.03) ongoing pregnancy/live birth (aOR 1.99, 95% CI 1.38, 2.86, p=0.0002), and decreased odds of clinical loss (aOR 0.42, 95% CI 0.21, 0.84, p=0.01). CONCLUSIONS: Clinical implementation of an automated mathematical algorithm for embryo ranking and selection is significantly associated with improved implantation and ongoing pregnancy/live birth as compared with traditional embryo selection in euploid SETs.


Assuntos
Algoritmos , Blastocisto , Resultado da Gravidez , Transferência de Embrião Único/métodos , Adulto , Blastocisto/citologia , Blastocisto/fisiologia , Tomada de Decisões Assistida por Computador , Implantação do Embrião , Feminino , Humanos , Gravidez , Taxa de Gravidez , Estudos Retrospectivos , Vitrificação
5.
Am J Obstet Gynecol ; 225(3): 287.e1-287.e8, 2021 09.
Artigo em Inglês | MEDLINE | ID: mdl-33798478

RESUMO

BACKGROUND: The rates of cesarean deliveries continue to increase worldwide. Previous work suggests an association between a previous cesarean delivery and reduced fertility in natural conception and in vitro fertilization treatment cycles. To our knowledge, there is no published research that explored the relationship between a previous cesarean delivery and the clinical outcomes after in vitro fertilization and the subsequent transfer of a single frozen-thawed euploid embryo. OBJECTIVE: This study aimed to investigate the relationship between the previous mode of delivery and subsequent pregnancy outcomes in patients undergoing a single frozen-thawed euploid embryo transfer after in vitro fertilization. STUDY DESIGN: A retrospective cohort study was performed at a single academic fertility center from January 2012 to April 2020. All women with a history of a live birth undergoing autologous, frozen-thawed single euploid embryo transfers were identified. Cases included patients with a single previous cesarean delivery; controls included patients with a single previous vaginal delivery. Only the first embryo transfer cycle was included. The primary outcome was the implantation rate. Secondary outcomes included ongoing pregnancy and live birth rates, biochemical pregnancy rate, and clinical miscarriage rate. RESULTS: A total of 525 patients met the inclusion criteria and were included in the analysis. Patients with a previous cesarean delivery had a higher body mass index (24.5±4.5 vs 23.4±4.1; P=.004) than those in the vaginal delivery cohort; the rest of the demographic data were otherwise similar. In a univariate analysis, the implantation rate was significantly lower in patients with a previous cesarean delivery (111/200 [55.5%] vs 221/325 [68.0%]; P=.004). After adjusting for the relevant covariates, a previous cesarean delivery was associated with a 48% reduction in the odds of implantation (adjusted odds ratio, 0.52; 95% confidence interval, 0.34-0.78; P=.002). In addition, after adjusting for the same covariates, a previous cesarean delivery was significantly associated with a 39% reduction in the odds of an ongoing pregnancy and live birth (adjusted odds ratio, 0.61; 95% confidence interval, 0.41-0.90; P=.01). There were no differences in the biochemical pregnancy rates or clinical miscarriage rates. CONCLUSION: This study demonstrated a marked reduction in implantation and ongoing pregnancy and live birth associated with a previous cesarean delivery in patients undergoing a single euploid embryo transfer. Our work stresses the importance of reducing the primary cesarean delivery rates at a national level and elucidating the mechanisms behind the substantially lower implantation rates after a cesarean delivery.


Assuntos
Cesárea , Fertilização in vitro , Transferência de Embrião Único , Adulto , Índice de Massa Corporal , Estudos de Casos e Controles , Estudos de Coortes , Criopreservação , Implantação do Embrião , Feminino , Humanos , Nascido Vivo , Gravidez , Taxa de Gravidez , Estudos Retrospectivos
6.
Eur J Med Genet ; 63(5): 103852, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-31972371

RESUMO

We investigated clinical error rates with single thawed euploid embryo transfer (STEET) diagnosed by next generation sequencing (NGS) and array comparative genomic hybridization (aCGH). A total of 1997 STEET cycles after IVF with preimplantation genetic testing for aneuploidy (PGT-A) from 2010 to 2017 were identified; 1151 STEET cycles utilized NGS, and 846 STEET cycles utilized aCGH. Any abortions, spontaneous or elective, in which products of conception (POCs) were collected were reviewed. Discrepancies between chorionic villus sampling, amniocentesis, or live birth results and PGT-A diagnosis were also included. Primary outcomes were clinical error rate per: ET, pregnancy with gestational sac, live birth, and spontaneous abortion with POCs available for analysis. Secondary outcomes included implantation rate (IR), spontaneous abortion rate (SABR), and ongoing pregnancy/live birth rate (OPR/LBR). The clinical error rates in the NGS cohort were: 0.7% per embryo, 1% per pregnancy with gestational sac, and 0.1% rate per OP/LB. The error rate per SAB with POCs was 13.3%. The IR was 69.1%, the OPR/LBR was 61.6%, and the spontaneous abortion rate was 10.2%. The clinical error rates in the aCGH cohort were: 1.3% per embryo, 2% per pregnancy with gestational sac, and 0.4% rate per OP/LB. The error rate per SAB with POCs was 23.3%. The IR was 63.8%, the OPR/LBR was 54.6%, and the SAB rate was 12.4%. Our findings demonstrate that, although NGS and aCGH are sensitive platforms for PGT-A, errors still occur. Appropriate patient counseling and routine prenatal screening are recommended for all patients undergoing IVF/PGT-A.


Assuntos
Aborto Espontâneo/genética , Hibridização Genômica Comparativa/normas , Erros de Diagnóstico/estatística & dados numéricos , Transferência Embrionária/efeitos adversos , Fertilização in vitro/efeitos adversos , Testes Genéticos/normas , Sequenciamento de Nucleotídeos em Larga Escala/normas , Aborto Espontâneo/diagnóstico , Aborto Espontâneo/etiologia , Aneuploidia , Transferência Embrionária/normas , Feminino , Fertilização in vitro/normas , Humanos , Gravidez , Análise de Sequência de DNA/normas
7.
F1000Res ; 82019.
Artigo em Inglês | MEDLINE | ID: mdl-31543950

RESUMO

Reports have correlated the use of estrogen for the treatment of menopausal symptoms with beneficial effects on the cardiovascular system. Molecular, biochemical, preclinical, and clinical studies have furnished a wealth of evidence in support of this outcome of estrogen action. The prospective randomized Women's Health Initiative (WHI) and the Early Versus Late Intervention Trial (ELITE) showed that starting menopausal hormone treatment (MHT) within 5 to 10 years of menopause is fundamental to the success of estrogen's cardioprotection in post-menopausal women without adverse effects. Age stratification of the WHI data has shown that starting hormone treatment within the first decade after menopause is both safe and effective, and the long-term WHI follow-up studies are supportive of cardioprotection. This is especially true in estrogen-treated women who underwent surgical menopause. A critique of the WHI and other relevant studies is presented, supporting that the timely use of estrogens protects against age- and hormone-related cardiovascular complications. Salutary long-term hormone treatment for menopausal symptoms and prevention of complications has been widely reported, but there are no prospective trials defining the correct length to continue MHT. At present, women undergoing premature menopause receive estrogen treatment (ET) until evidence of hormone-related complications intervenes. Normal women started on MHT who receive treatment for decades without hormone-related complications have been reported, and the WHI follow-up studies are promising of long-term post-treatment cardioprotection. A prevention-based holistic approach is proposed for timely and continuing MHT/ET administration as part of the general management of the menopausal woman. But this should be undertaken only with scheduled, annual patient visits including evaluations of cardiovascular status. Because of the continued occurrence of reproductive cancers well into older ages, these visits should include genital and breast cancer screening.


Assuntos
Cardiotônicos/uso terapêutico , Sistema Cardiovascular , Terapia de Reposição de Estrogênios , Menopausa , Idoso , Estrogênios/uso terapêutico , Feminino , Humanos , Pessoa de Meia-Idade , Estudos Prospectivos , Ensaios Clínicos Controlados Aleatórios como Assunto , Saúde da Mulher
8.
Reprod Sci ; 26(12): 1661-1665, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-30572797

RESUMO

Two of the many milestone developments in the field of assisted reproduction have been oocyte donation and preimplantation genetic testing for aneuploidy (PGT-A). Because it has been demonstrated that even young women produce a meaningful proportion of aneuploid embryos, screening out such abnormalities could potentially increase the efficacy of donor egg (DE) cycles. In this retrospective cohort study, we investigated the effect of PGT-A on DE cycle outcomes, including implantation rate (IR), spontaneous abortion rate (SABR), and ongoing pregnancy/live birth rate. We used fresh and frozen donor cycles not using PGT-A as comparison groups; all cases involved single embryo transfer. Data analysis revealed that PGT-A did not improve pregnancy outcome metrics in DE cycles, although there was a trend toward decreasing the SABR. There was a significant increase in IR with fresh cycles outperforming all frozen cycles. Overall, these results suggest that the benefits of performing PGT-A on embryos derived from young DEs may be limited and that there is an effect of the freezing process on pregnancy outcomes. These findings may provide useful insights into the science and practice of PGT-A across all of its applications.


Assuntos
Doação de Oócitos , Resultado da Gravidez , Diagnóstico Pré-Implantação , Transferência de Embrião Único , Adulto , Feminino , Hormônio Foliculoestimulante/sangue , Testes Genéticos , Humanos , Gravidez , Taxa de Gravidez , Estudos Retrospectivos , Adulto Jovem
9.
Fertil Steril ; 109(4): 627-632, 2018 04.
Artigo em Inglês | MEDLINE | ID: mdl-29605407

RESUMO

OBJECTIVE: To evaluate whether the use of next generation sequencing (NGS) for preimplantation genetic screening (PGS) in single thawed euploid embryo transfer (STEET) cycles improves pregnancy outcomes compared with array comparative genomic hybridization (aCGH). DESIGN: Retrospective cohort study. SETTING: Single university-based fertility center. PATIENT(S): A total of 916 STEET cycles from January 2014 to December 2016 were identified. Cases included 548 STEET cycles using NGS for PGS and controls included 368 STEET cycles using aCGH for PGS. INTERVENTION(S): Patients having a STEET after undergoing IVF and PGS with either NGS or aCGH. MAIN OUTCOME MEASURE(S): Primary outcomes were implantation rate, ongoing pregnancy/live birth rate (OP/LBR), biochemical pregnancy rate (PR), and spontaneous abortion (SAB) rate. RESULT(S): The implantation rate was significantly higher in the NGS group compared with the aCGH group (71.6% vs. 64.6%). The OP/LBR was also significantly higher in the NGS group (62% vs. 54.4%), and there were significantly more biochemical pregnancies in the aCGH group compared with the NGS group (15.1% vs. 8.7%). After adjustment for confounding variables with a multiple logistic regression analysis, OP/LBR remained significantly higher in the NGS group. The SAB rate was not significantly different in the NGS group compared with the aCGH group (12.4% vs. 12.7%). CONCLUSION(S): Preimplantation genetic screening using NGS significantly improves pregnancy outcomes versus PGS using aCGH in STEET cycles. Next-generation sequencing has the ability to identify and screen for embryos with reduced viability such as mosaic embryos and those with partial aneuploidies or triploidy. Pregnancy outcomes with NGS may be improved due to the exclusion of these abnormal embryos.


Assuntos
Blastocisto/patologia , Hibridização Genômica Comparativa , Criopreservação , Fertilização in vitro , Testes Genéticos/métodos , Sequenciamento de Nucleotídeos em Larga Escala , Infertilidade/terapia , Diagnóstico Pré-Implantação/métodos , Transferência de Embrião Único , Aborto Espontâneo/etiologia , Aborto Espontâneo/genética , Adulto , Implantação do Embrião , Feminino , Fertilidade , Fertilização in vitro/efeitos adversos , Humanos , Infertilidade/diagnóstico , Infertilidade/genética , Infertilidade/fisiopatologia , Nascido Vivo , Mosaicismo , Valor Preditivo dos Testes , Gravidez , Resultado da Gravidez , Reprodutibilidade dos Testes , Estudos Retrospectivos , Transferência de Embrião Único/efeitos adversos , Resultado do Tratamento
10.
JMIR Res Protoc ; 5(3): e166, 2016 Aug 23.
Artigo em Inglês | MEDLINE | ID: mdl-27554915

RESUMO

BACKGROUND: There are many challenges in conducting surveys of study participants, including cost, time, and ability to obtain quality and reproducible work. Cloudsourcing (an arrangement where a cloud provider is paid to carry out services that could be provided in-house) has the potential to provide vastly larger, less expensive, and more generalizable survey pools. OBJECTIVE: The objective of this study is to evaluate, using Amazon's Mechanical Turk (MTurk), a cloud-based workforce to assess patients' perspectives of health care. METHODS: A national online survey posted to Amazon's MTurk consisted of 33 multiple choice and open-ended questions. Continuous attributes were compared using t tests. RESULTS: We obtained 1084 responses for a total cost of US $298.10 in less than 3 days with 300 responses in under 6 hours. Of those, 44.74% (485/1084) were male and 54.80% (594/1084) female, representing 49 out of 50 states and aged 18 to 69 years. CONCLUSIONS: Amazon's MTurk is a potentially useful survey method for attaining information regarding public opinions and/or knowledge with the distinct advantage of cost, speed, and a wide and relatively good representation of the general population, in a confidential setting for respondents.

12.
Obstet Gynecol ; 125(6): 1313-1320, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-26000502

RESUMO

OBJECTIVE: To assess attitudes and perceptions of U.S. survey respondents regarding prevalence, causes, and emotional effects of miscarriage. METHODS: We used a questionnaire consisting of 33 questions administered in January of 2013 to men and women aged 18-69 years across the United States. RESULTS: Participants from 49 states completed the questionnaire: 45% male and 55% female (N=1,084). Fifteen percent reported they or their partner experienced at least one miscarriage. Fifty-five percent of respondents believed that miscarriage occurred in 5% or less of all pregnancies. Commonly believed causes of miscarriage included a stressful event (76%), lifting a heavy object (64%), previous use of an intrauterine device (28%), or oral contraceptives (22%). Of those who had a miscarriage, 37% felt they had lost a child, 47% felt guilty, 41% reported feeling that they had done something wrong, 41% felt alone, and 28% felt ashamed. Nineteen percent fewer people felt they had done something wrong when a cause for the miscarriage was found. Seventy-eight percent of all participants reported wanting to know the cause of their miscarriage, even if no intervention could have prevented it from occurring. Disclosures of miscarriages by public figures assuaged feelings of isolation for 28% of respondents. Level of education and gender had a significant effect on perceptions and understanding of miscarriage. CONCLUSION: Respondents to our survey erroneously believed that miscarriage is a rare complication of pregnancy, with the majority believing that it occurred in 5% or less of all pregnancies. There were also widespread misconceptions about causes of miscarriage. Those who had experienced a miscarriage frequently felt guilty, isolated, and alone. Identifying a potential cause of the miscarriage may have an effect on patients' psychological and emotional responses. LEVEL OF EVIDENCE: II.


Assuntos
Aborto Espontâneo/epidemiologia , Aborto Espontâneo/etiologia , Conhecimentos, Atitudes e Prática em Saúde , Aborto Espontâneo/psicologia , Adolescente , Adulto , Idoso , Estudos Transversais , Coleta de Dados , Escolaridade , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Percepção , Prevalência , Fatores Sexuais , Vergonha , Estados Unidos , Adulto Jovem
13.
J Clin Invest ; 122(6): 2153-64, 2012 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-22585574

RESUMO

Beare-Stevenson cutis gyrata syndrome (BSS) is a human genetic disorder characterized by skin and skull abnormalities. BSS is caused by mutations in the FGF receptor 2 (FGFR2), but the molecular mechanisms that induce skin and skull abnormalities are unclear. We developed a mouse model of BSS harboring a FGFR2 Y394C mutation and identified p38 MAPK as an important signaling pathway mediating these abnormalities. Fgfr2+/Y394C mice exhibited epidermal hyperplasia and premature closure of cranial sutures (craniosynostosis) due to abnormal cell proliferation and differentiation. We found ligand-independent phosphorylation of FGFR2 and activation of p38 signaling in mutant skin and calvarial tissues. Treating Fgfr2+/Y394C mice with a p38 kinase inhibitor attenuated skin abnormalities by reversing cell proliferation and differentiation to near normal levels. This study reveals the pleiotropic effects of the FGFR2 Y394C mutation evidenced by cutis gyrata, acanthosis nigricans, and craniosynostosis and provides a useful model for investigating the molecular mechanisms of skin and skull development. The demonstration of a pathogenic role for p38 activation may lead to the development of therapeutic strategies for BSS and related conditions, such as acanthosis nigricans or craniosynostosis.


Assuntos
Anormalidades Múltiplas/tratamento farmacológico , Anormalidades Múltiplas/enzimologia , Sistema de Sinalização das MAP Quinases/efeitos dos fármacos , Mutação de Sentido Incorreto , Inibidores de Proteínas Quinases/farmacologia , Receptor Tipo 2 de Fator de Crescimento de Fibroblastos/metabolismo , Proteínas Quinases p38 Ativadas por Mitógeno/antagonistas & inibidores , Anormalidades Múltiplas/genética , Anormalidades Múltiplas/patologia , Acantose Nigricans/tratamento farmacológico , Acantose Nigricans/enzimologia , Acantose Nigricans/genética , Acantose Nigricans/patologia , Substituição de Aminoácidos , Animais , Craniossinostoses/tratamento farmacológico , Craniossinostoses/enzimologia , Craniossinostoses/genética , Craniossinostoses/patologia , Humanos , Camundongos , Camundongos Transgênicos , Receptor Tipo 2 de Fator de Crescimento de Fibroblastos/genética , Anormalidades da Pele/tratamento farmacológico , Anormalidades da Pele/enzimologia , Anormalidades da Pele/genética , Anormalidades da Pele/patologia , Crânio/anormalidades , Síndrome , Proteínas Quinases p38 Ativadas por Mitógeno/genética , Proteínas Quinases p38 Ativadas por Mitógeno/metabolismo
14.
J Neurosci ; 27(52): 14326-37, 2007 Dec 26.
Artigo em Inglês | MEDLINE | ID: mdl-18160640

RESUMO

The trafficking of postsynaptic AMPA receptors (AMPARs) is a powerful mechanism for regulating the strength of excitatory synapses. It has become clear that the surface levels of inhibitory GABA(A) receptors (GABA(A)Rs) are also subject to regulation and that GABA(A)R trafficking may contribute to inhibitory plasticity, although the underlying mechanisms are not fully understood. Here, we report that NMDA receptor activation, which has been shown to drive excitatory long-term depression through AMPAR endocytosis, simultaneously increases expression of GABA(A)Rs at the dendritic surface of hippocampal neurons. This NMDA stimulus increases miniature IPSC amplitudes and requires the activity of Ca2+ calmodulin-dependent kinase II and the trafficking proteins N-ethylmaleimide-sensitive factor, GABA receptor-associated protein (GABARAP), and glutamate receptor interacting protein (GRIP). These data demonstrate for the first time that endogenous GABARAP and GRIP contribute to the regulated trafficking of GABA(A)Rs. In addition, they reveal that the bidirectional trafficking of AMPA and GABA(A) receptors can be driven by a single glutamatergic stimulus, providing a potent postsynaptic mechanism for modulating neuronal excitability.


Assuntos
Exocitose/fisiologia , Glutamato Descarboxilase/metabolismo , Potenciais Pós-Sinápticos Inibidores/fisiologia , Proteínas Associadas aos Microtúbulos/metabolismo , Neurônios/fisiologia , Receptores de GABA/fisiologia , Receptores de N-Metil-D-Aspartato/fisiologia , Animais , Animais Recém-Nascidos , Biotinilação/métodos , Células Cultivadas , Inibidores Enzimáticos/farmacologia , Fármacos Atuantes sobre Aminoácidos Excitatórios/farmacologia , Exocitose/efeitos dos fármacos , Hipocampo/citologia , Técnicas In Vitro , Potenciais Pós-Sinápticos Inibidores/efeitos dos fármacos , Potenciais Pós-Sinápticos Inibidores/efeitos da radiação , N-Metilaspartato/farmacologia , Neurônios/efeitos dos fármacos , Técnicas de Patch-Clamp/métodos , Transporte Proteico/efeitos dos fármacos , Transporte Proteico/fisiologia , RNA Interferente Pequeno/farmacologia , Ratos , Ratos Sprague-Dawley , Fatores de Tempo
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