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BACKGROUND: Therapeutic phlebotomy (TP), a widely used medical procedure, can be performed on diverse patients with iron overload or polyglobulia. However, its adverse events are not well known as most of the information on phlebotomy is derived from healthy blood donors (0.1%-5.3%). In contrast, TP is applicable to a broader, more complex population with comorbidities and old age. To ascertain the incidence of adverse events in phlebotomies, we conducted a prospective study on patients who attended our Unit. STUDY DESIGN AND METHODS: We prospectively gathered data from patients referred to our Unit for TP. Data regarding demographics, health status, and adverse events within at least 24 h of phlebotomy were gathered via a structured questionnaire during each visit. RESULTS: Between August 2021 and September 2022, 189 patients underwent 587 procedures. Most patients were men, over 60 (57.3%) had comorbidities, and 93% underwent at least two procedures during the study period. Twenty patients (10.8%) presented 25 adverse events (4.3% of phlebotomies), usually vasovagal reactions, none of which were clinically relevant, and all were managed by nursing staff on site, with full patient recovery. DISCUSSION: The rate of adverse events (<5%) in patients undergoing TP was low and comparable to that seen in healthy blood donors. Consequently, even old patients and those with some comorbidities can safely undergo TP when the process is carefully managed.
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Flebotomía , Humanos , Flebotomía/efectos adversos , Masculino , Femenino , Estudios Prospectivos , Persona de Mediana Edad , Anciano , Adulto , Anciano de 80 o más Años , Sobrecarga de Hierro/etiología , Síncope Vasovagal/etiología , Síncope Vasovagal/epidemiología , Encuestas y CuestionariosRESUMEN
OBJECTIVE: Activated prothrombin complex concentrate (aPCC) is a bypassing agent indicated to treat bleeds in patients with acquired hemophilia A (AHA). Nevertheless, its efficacy and safety in the real-world setting have not often been addressed. METHODS: We report the experience of Spanish reference centers for coagulation disorders and from acquired hemophilia Spanish Registry (AHASR) from August 2012 to February 2021. Follow-up period of 30 days after aPCC withdrawal. RESULTS: Thirty patients with a median age of 70 years old, suffering from 51 bleeds treated with aPCC were finally evaluated. As first-line treatment, aPCC stopped bleeding in 13 of 14 (92.9%) cases. aPCC as the second line after recombinant factor VIIa failure, stopped bleeding in all cases. In 17 patients, aPCC was used far from initial bleed control as prophylaxis of rebleeding with 94% effectiveness. No thromboembolic episodes were communicated. One patient developed hypofibrinogenemia, which did not prevent aPCC from halting bleeding. No other serious adverse events possibly or probably associated with aPCC were reported. CONCLUSIONS: This data support aPCC as hemostatic treatment in AHA with high effectiveness and excellent safety profile in acute bleeds and as extended use to prevent rebleedings, even in aging people with high cardiovascular risk.
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Hemofilia A , Anciano , Humanos , Factores de Coagulación Sanguínea/uso terapéutico , Análisis Costo-Beneficio , Factor IX/uso terapéutico , Factor VIII/uso terapéutico , Hemofilia A/complicaciones , Hemofilia A/tratamiento farmacológico , Hemorragia/etiología , Hemorragia/tratamiento farmacológico , Proteínas Recombinantes/uso terapéuticoRESUMEN
OBJECTIVE: To assess seizure control and tolerability of eslicarbazepine acetate (ESL) as adjunctive therapy to one baseline antiepileptic drug (AED), in adults with partial-onset seizures (POS) with or without secondary generalization. METHODS: Multicenter, non-interventional, prospective cohort study conducted between March 2012 and September 2014 at 12 neurology departments in Portugal. Adults with POS not controlled with one AED who had initiated ESL as adjunctive treatment were enrolled. Retention rate was defined at the final visit (Vfinal) 6-9 months of follow-up. Proportion of responders, seizure-free, changes in seizure frequency were evaluated using patients' diaries. Clinical Global Impression of Change (CGI-C) and Clinical Global Impression of Severity (CGI-S) were assessed by the neurologist. RESULTS: Fifty-two patients (48.1% male) were included with mean age 41.5±13.3 years. Mean epilepsy duration was 18.5±14.8 years; mean seizure frequency in the four previous weeks to baseline was 7.5±12.7. At Vfinal, retention rate was 73.0%; responder rate and seizure-free rates were 71.1% and 39.5%, respectively. The median relative reduction in seizure frequency between baseline and Vfinal was 82.2%. A reduction in epilepsy severity (CGI-S) was observed in 42.1%. According to CGI-C, 73.6% patients had their epilepsy "much improved" or "very much improved". Twelve patients (23.1%) had at least one adverse event (AE), two (3.9%) had one serious AE, and five (9.6%) discontinued due to AE. CONCLUSIONS: Eslicarbazepine acetate showed good retention rates, elicited a significant reduction in seizure frequency, and was well tolerated when used in the clinical practice.
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Anticonvulsivantes/uso terapéutico , Dibenzazepinas/uso terapéutico , Epilepsias Parciales/tratamiento farmacológico , Adulto , Anticonvulsivantes/efectos adversos , Dibenzazepinas/efectos adversos , Quimioterapia Combinada , Femenino , Humanos , Masculino , Persona de Mediana Edad , Estudios Prospectivos , Resultado del TratamientoRESUMEN
BACKGROUND: The mutual impact of Behçet's disease (BD) and pregnancy is variable and still unclear. Among the safe drugs administered, the newer infliximab (IFX) was rarely experienced in pregnancy, particularly in the third trimester. CASE: The authors report a pregnancy with fetal growth restriction at 36 weeks in a 31-year-old primigravida with symptomatic BD, treated with uninterrupted monthly IFX and daily enoxaparin. The patient was induced at 38 weeks and had an uneventful vaginal delivery of a healthy baby. The postpartum period and following six months were uneventful for mother in terms of BD exacerbation, and newborn in terms of potential risks of neonatal BD and/or infections due to late immunosuppressive IFX administration. CONCLUSION: Because of the inconstant mutual impact, BD pregnancies should be precautionary considered at "potential high-risk" and need a careful and close monitoring by a multidisciplinary team with specific expertise.
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Antiinflamatorios no Esteroideos/uso terapéutico , Anticuerpos Monoclonales/uso terapéutico , Síndrome de Behçet/tratamiento farmacológico , Retardo del Crecimiento Fetal/tratamiento farmacológico , Complicaciones del Embarazo/tratamiento farmacológico , Anticoagulantes/uso terapéutico , Enoxaparina/uso terapéutico , Femenino , Humanos , Recién Nacido , Infliximab , Trabajo de Parto Inducido , Masculino , Embarazo , Tercer Trimestre del EmbarazoRESUMEN
PURPOSE: The purpose of this study was to analyse the distribution of occlusal forces in the dental arches released during tooth clenching in patients with symptoms of temporomandibular disorders, and to analyse the age and gender structure of the patients in the study group and the control group. MATERIALS AND METHOD: The study was carried out on a group of 58 patients, of both genders, aged 18-40 years, with full dental arches, who presented for treatment at the Prosthodontics Clinic of the University Dental Clinic in Kraków due to symptoms of temporomandibular disorders. The patients were divided into two groups. The first group (study group) comprised 26 patients with painful temporomandibular disorders, while the second group (control group) comprised 32 patients without pain. The study only included patients over 18 years of age, with full dental arches with symptoms of temporomandibular disorders. All patients underwent a basic dental examination and a specialized functional examination of the masticatory organ. A T-Scan III-Novus instrument with electronic occlusal articulation paper was used to assess the distribution of occlusal contacts. RESULTS: In the study, women (43) were a larger group than men (15). Statistically significant values for the percentage distribution of occlusal contacts were obtained in group of women in the study group on the right and left side, in the area of molars and premolars. In the analysis of the percentage distribution of occlusal contacts in both the study and control groups, it can be seen that the first molars (teeth 16 and 26) showed a larger percentage range of values than the other teeth. The smallest values can be observed on the second incisal teeth and on the canines. CONCLUSIONS: The first molars are, in the majority of patients, the teeth on which the strongest occlusal contacts are generated. Excessive participation of incisal teeth in occlusion might influence the development of the pain form of TMD. In order to determine whether there is a correlation between an uneven distribution of occlusal contacts and TMD pain, studies on larger numbers of patients are needed. © 2024 Australian Dental Association.
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Background: Freezing of gait (FOG) is a debilitating symptom of Parkinson's disease (PD) that is often refractory to medication. Pathological prolonged beta bursts within the subthalamic nucleus (STN) are associated with both worse impairment and freezing behavior in PD, which are improved with deep brain stimulation (DBS). The goal of the current study was to investigate the feasibility, safety, and tolerability of beta burst-driven adaptive DBS (aDBS) for FOG in PD. Methods: Seven individuals with PD were implanted with the investigational Summit™ RC+S DBS system (Medtronic, PLC) with leads placed bilaterally in the STN. A PC-in-the-loop architecture was used to adjust stimulation amplitude in real-time based on the observed beta burst durations in the STN. Participants performed either a harnessed stepping-in-place task or a free walking turning and barrier course, as well as clinical motor assessments and instrumented measures of bradykinesia, OFF stimulation, on aDBS, continuous DBS (cDBS), or random intermittent DBS (iDBS). Results: Beta burst driven aDBS was successfully implemented and deemed safe and tolerable in all seven participants. Gait metrics such as overall percent time freezing and mean peak shank angular velocity improved from OFF to aDBS and showed similar efficacy as cDBS. Similar improvements were also seen for overall clinical motor impairment, including tremor, as well as quantitative metrics of bradykinesia. Conclusion: Beta burst driven adaptive DBS was feasible, safe, and tolerable in individuals with PD with gait impairment and FOG.
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OBJECTIVE: This review intends to introduce the changes of the new Bioethics law in the reproductive field and its application in French ART centers. MATERIAL AND METHODS: The review details the main provisions of the Bioethics Law of August 2nd 2021 as well as the three decrees published since: the first one on September 29th 2021, which specifies in particular the age conditions to benefit from ART and self-preservation of one's gametes; another decree on December 31st, 2021, to set the terms and conditions for gamete self-preservation activities for non-medical reasons and the last decree on April 14th 2022, relating to the allocation of donated gametes and embryo donation. RESULTS: Since the law of August 2nd, 2021, access conditions to assisted reproductive technology (ART) have evolved in France. Previously based on pathological infertility or the risk of transmission of a serious disease, ART is now intended to respond to the parental project of a couple formed by a man and a woman, two women or an unmarried woman. With the widening of access conditions, the use of gamete donation will likely increase. The upcoming raise of children born from gamete donation has led the legislator to question their right to access their origin. From September 1st 2022, adults born from gamete donation will be able to request a special administrative authority in order to access the donor's non identifying data (age, physical characteristics, family and professional situation, motivation for the donation ) and/or the donor's identity. Moreover, the new bioethics law opens up the possibility of autologous gamete cryopreservation without medical reasons, under specific age conditions, in order to carry out an assisted reproduction technique later. If gametes are not used, autologous gamete preservation could also allow an increase in gamete donation. However, the modification of gamete donation conditions could suggest a short term decrease in donors' number. Finally, the new bioethics law further opens up research on human embryos and embryonic stem cells. CONCLUSION: The arrangements introduced by the Bioethics Law promulgated on August 2nd, 2021 represent a major revolution in the field of Reproductive Medicine and are expected to transform the practices of reproductive biology centers and CECOS in France.
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Bioética , Infertilidad , Adulto , Masculino , Niño , Femenino , Humanos , Destinación del Embrión , Técnicas Reproductivas Asistidas , Donantes de TejidosRESUMEN
OBJECTIVE: The aim of this review is to update data concerning the impact of HLA-C KIR system on placental disorders and assess the involvement on ART clinical outcomes. METHOD: Ensuring the maintenance of human pregnancy requires the set up of immunological tolerance to prevent foetus rejection. This phenomenon involves different actors of the immune system: among them, uterine NK cells (uNK) hold specific KIR (killer-cell immunoglobulin-like) receptors linking to HLA molecules on the surface of trophoblastic cells at implantation. Many studies provided evidence that the specific interaction between maternal KIR and foetal HLA-C could influence the process of placentation; according to the KIR haplotype and the type of HLA-C, the interaction could be detrimental for placental function. We reviewed the latest data available regarding HLA-C KIR interactions and ART outcomes. RESULTS: The available results highlight a significant increase of preeclampsia risk and recurrent miscarriages when the maternal inhibitory haplotype KIR AA is present, this risk is all the more enhanced when the interaction occurs with foetal HLA-C2. Recent data suggest the consequences of this detrimental interaction in case of DET (double embryo transfer) or use of donor's oocytes in ART practice. On the other hand, maternal KIR AB or BB haplotypes haven't been related to an additional obstetrical risk, as well as the foetal HLA-C1 homozygous allotype. CONCLUSION: Despite the existence of many confoundings in current literature on the subject, interaction between maternal KIR and foetal HLA-C represent a promising target lead to broaden the spectrum of placental defects etiologies, especially in the reproductive health area.
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Antígenos HLA-C , Placenta , Receptores KIR , Femenino , Antígenos HLA-C/genética , Humanos , Placenta/patología , Placentación , Embarazo , Receptores KIR/genética , Técnicas Reproductivas Asistidas , TrofoblastosRESUMEN
Infertility affects between 8 and 12% of reproductive-age couples worldwide. Despite improvements in assisted reproductive techniques (ART), live birth rates are still limited. In clinical practice, imaging and microscopy are currently widely used, but their diagnostic effectiveness remains limited. In research, the emergence of innovative techniques named OMICS would improve the identification of the implantation window, while progressing in the understanding of the pathophysiological mechanisms involved in embryo implantation failures. To date, transcriptomic analysis seems to be the most promising approach in clinical research. The objective of this review is to present the results obtained with the different approaches available in clinical practice and in research to assess endometrial receptivity in patients undergoing ART.
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Implantación del Embrión , Infertilidad , Endometrio , Femenino , Humanos , Técnicas Reproductivas AsistidasRESUMEN
The genital microbiota actively participates in women's reproductive health. Indeed, a genital dysbiosis (microbial imbalance associated with adverse effects on host health) can lead to vaginal infections (such as mycoses or bacterial vaginosis). Recent data reported that genital dysbiosis (e.g. vaginal or endometrial) was associated with fewer chances of live births in assisted reproductive technologies (ART), via decreased pregnancy rates and an increased risk of miscarriages. The presence or diversity of certain bacterial strains (in particular Gardenellavaginalis, Proteobacteria, Lactobacillusjensenii, Lactobacilluscrispatus or Atopobiumvaginae) within the genital microbiota seem to be associated with the outcomes of ART cycles, suggesting new approaches to improve ART results. In this review, we aim at presenting the state of art on the association between the female genital microbiota and ART success. The diagnostic and therapeutic approaches (i.e. probiotics, antibiotic therapy and transplantation of vaginal microbiota) in the management of patients with altered microbiota will also be discussed. The confirmation of these data in the coming years could significantly improve the management of infertile patients in ART with a more personalized approach partially based on the female genital microbiotic profile.
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Infertilidad , Microbiota , Femenino , Humanos , Embarazo , Índice de Embarazo , Técnicas Reproductivas Asistidas , VaginaRESUMEN
PURPOSE: Epilepsy is one of the most common neurological disorders, with a national prevalence of 6.54/1000. The majority of the patients are adolescents and at risk of experiencing a seizure in school. Consequently, schoolteachers would be among the first health care providers. Thus, teachers' knowledge and practice are imperative for the students' safety and development. We aimed to assess the knowledge of epilepsy and seizure first aid among teachers at all educational levels in Jeddah, Saudi Arabia. METHOD: A cross-sectional study using a self-administered validated questionnaire was distributed to teachers to assess their necessary demographic data and their knowledge about epilepsy and seizure first aid by using Chi-square test to find significant associations. RESULTS: Our sample included 822 teachers, 54.1% of the respondents were male, and 45.7% female. The majority of participants had moderate knowledge of epilepsy and lacked first aid training. Most participants recognized epilepsy as a neurological disorder, and 42.2% have witnessed a seizure in school. Our study showed a significant relationship between knowledge score and qualification (P-value = 0.037) as well as knowledge score and witnessing a seizure (P-value = 0.046). CONCLUSION: The knowledge score shows that teachers in Jeddah have moderate knowledge of epilepsy, and approximately one-tenth have taken first aid training. We recommend educational campaigns on epilepsy and first aid courses targeting students and teachers in schools.
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In recent years, the number of patients applying for prosthetic treatment due to temporomandibular joint disorders (TMD) has been increasing. The main methods for treating disorders are the use of occlusal splints and physiotherapeutic rehabilitation as supportive treatment. Radio waves are electromagnetic waves with radiation frequency between 3 Hz and 3 THz, used for physiotherapeutic treatment of skeletal muscle relaxation in the range of 3 to 6 MHz. The rehabilitation effect of these waves is based on diathermy by means of high-voltage quick alternating current. Aim. The aim of the study was to evaluate the influence of radiofrequency waves on the pain of the masticatory muscles in the course of TMD and the usefulness of these procedures in the supporting treatment of these disorders. Materials and Methods. Patients aged 19 to 45 years, of both sexes, reported to the Consulting Room of TMD at the Institute of Dentistry in Krakow to undertake prosthetic treatment of TMD (I a-according to RDC/TMD). Study group (SG) consists of 20 patients who had 10 supportive treatments with radiofrequency currents. In the case of application of radiation to the muscle area, the energy was 20 J to the area of the masticatory muscles, the frequency was 3 MHz, bipolar technique, the duration of the procedure was 10 minutes, and the coupling substance was a gel for ultrasound examinations. The control group (CG) consisted of 20 patients who had 10 supportive treatments with sonophoresis procedures. For the area of masticatory muscles, 0.9 W/cm2 treatments were applied, the duty factor was 80%, the treatment time was 10 minutes, and the medical substance was 25% Voltaren gel. Results. Analysis of the results of the first clinical examinations (axis I) conducted in both groups shows a homogeneous clinical material and similar results. The second clinical examination revealed improved clinical parameters, but it showed a greater improvement in the SG. In the SG, the mean level of VAS was 6.25, and the extreme values were 5.9-0.14, the median was 2.15, and the standard deviation was 1.54. In the CG, the average value of VAS was 6.20 (peak of 5.2-0.7), the median was 2.4, and the standard deviation was 1.87. Summary. The search for new methods of supportive treatment of TMD is an important research direction due to the complex etiology of this disease and the lack of an explicit treatment algorithm. Conclusion. The results of our own research clearly indicate that the use of the radiofrequency waves brings pain relief and improvement of clinical parameters to a greater extent than in sonophoresis. It can be a very important new method in supportive treatment of TMD. Research needs to be continued.
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Terapia por Radiofrecuencia/métodos , Trastornos de la Articulación Temporomandibular/terapia , Adulto , Femenino , Humanos , Masculino , Músculos Masticadores/efectos de la radiación , Persona de Mediana Edad , Ferulas Oclusales , Adulto JovenRESUMEN
OBJECTIVE: It is already known that children born after slow frozen embryo replacement have a significantly higher birth weight compared to children born after fresh embryo transfer. Similar data have been reported related to frozen embryo transfer using an open vitrification system. However, few data relative to birth weight using a complete embryo closed vitrification system has been reported. The purpose of this study was to know if frozen embryo in closed vitrification system is associated with a higher birth weight compared to fresh embryo replacement. DESIGN: This was a monocentric retrospective cohort study, 371 children were issued from fresh embryo replacement and 127 from vitrified embryo transfer. MATERIALS AND METHODS: All singletons born after fresh or vitrified embryo transfer between January 2011 and April 2015 were included. Births from the vitrified or fresh transfers of egg or sperm donation, and preimplantation genetic diagnosis were excluded. In addition, pregnancies with more than one gestational sac at the first ultrasound were excluded. An analysis of covariance (ANCOVA) was used for multivariate analysis. RESULTS: Mean birth weight was 205g higher in the frozen embryo compared with fresh embryos transfer groups (3368g vs. 3163g respectively, P<0.001). This difference remained after multivariate analysis adjusted on confounding factors such as gestational age, maternal age, maternal body mass index (BMI), tobacco exposure, number of embryo transferred and birth order (P<0.001).. CONCLUSIONS: Embryo frozen in closed vitrification system is associated with a higher birth weight compared to fresh embryo replacement. Our findings are consistent with the previous studies related to slow freezing and open vitrification systems data. The effects of controlled ovarian stimulation (COS), ex vivo culture conditions and cryopreservation systems on birth weight of children born should be further explored.
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Peso al Nacer , Criopreservación/métodos , Transferencia de Embrión/métodos , Adulto , Estudios de Cohortes , Embrión de Mamíferos/fisiología , Femenino , Fertilización In Vitro , Humanos , Recién Nacido , Masculino , Embarazo , Estudios RetrospectivosRESUMEN
For detection of phenolic compounds in environmental water samples we propose an amperometric biosensor based on tyrosinase immobilized in titania sol-gel. The analytical characteristics toward catechol, p-cresol, phenol, p-chlorophenol, and p-methylcatechol were determined. The linear range for catechol determination was 2.2 x 10(-7)-1.3 x 10(-5) mol L(-1) with a limit of detection of 9 x 10(-8) mol L(-1) and sensitivity 2.0 x 10(3) mA mol(-1) L. The influence of sample matrix components on the electrode response was studied according to Plackett-Burman experimental design. The potential interferents Mg(2+), Ca(2+), HCO3(-), SO4(2-), and Cl(-), which are usually encountered in waters, were taken into account in the examination. Cu(2+) was also taken into account, because CuSO(4) is sometimes added to a water sample, as a preservative, before determination of phenolic compounds. It was found that among the ions tested only Mg(2+) and Ca(2+) did not directly affect the electrode response. The developed biosensor was used for determination of catechol in spring and surface water samples using the standard addition method.
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Técnicas Biosensibles/métodos , Enzimas Inmovilizadas/metabolismo , Monofenol Monooxigenasa/metabolismo , Transición de Fase , Fenoles/análisis , Fenoles/química , Titanio/química , Agaricales/enzimología , Electrodos , Enzimas Inmovilizadas/química , Monofenol Monooxigenasa/química , Temperatura , AguaRESUMEN
The aim of this study was to update our acknowledgment if there is a link between assisted embryo cryopreservation and epigenetics in human? Animal studies have demonstrated epigenetics consequence and especially imprinting disorders due to in vitro culture. In human, it is important to note that after frozen embryo transfer birth weight is significantly increased by 81 to 250g. But these studies cannot identify the reasons of such difference. This review strongly suggests that embryo cryopreservation is responsible for birth weight variations but mechanisms not yet elucidated. Epigenetics is probably one of these but to date, none study is able to prove it. We have to be attentive on a possible link between assisted reproductive technology (ART) and epigenetics reprogrammation.
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Peso al Nacer , Criopreservación , Transferencia de Embrión/métodos , Epigénesis Genética , Criopreservación/métodos , Criopreservación/estadística & datos numéricos , Femenino , Humanos , Embarazo , Técnicas Reproductivas Asistidas/efectos adversos , Técnicas Reproductivas Asistidas/estadística & datos numéricosRESUMEN
The frequency of polycystic ovary syndrome (PCOS) and the consequent fertility disorders cause many difficulties in the management of the assisted reproductive technics. Some studies are focused on different additional treatments, stimulation protocols or techniques that could optimize the in vitro fertilization cycles. The quality of the oocytes and embryos of these patients is also an outstanding issue. They remain difficult to actually evaluate during management, and none of the few published studies on this subject demonstrated any inferiority, compared to control patients. However, many differences have been highlighted, studying intra- and extra-ovarian factors. The advent of new genetic techniques could allow a better understanding of the pathophysiological mechanisms of the syndrome, as well as refining the evaluation of oocytes and embryos, in order to better predict the results of in vitro fertilization attempts. Pregnancy and birth rates, however, appear to be comparable to those of the general population.
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Embrión de Mamíferos/fisiología , Fertilización In Vitro , Infertilidad Femenina/etiología , Oocitos/fisiología , Síndrome del Ovario Poliquístico/complicaciones , Blastocisto/fisiología , Femenino , Humanos , Infertilidad Femenina/fisiopatología , Infertilidad Femenina/terapia , Síndrome del Ovario Poliquístico/genética , Síndrome del Ovario Poliquístico/fisiopatología , Embarazo , Inyecciones de Esperma Intracitoplasmáticas , Resultado del TratamientoRESUMEN
Autophagosomes primarily mediate turnover of cytoplasmic proteins or organelles to provide nutrients and eliminate damaged proteins. In neurons, autophagosomes form in distal axons and are trafficked retrogradely to fuse with lysosomes in the soma. Although defective neuronal autophagy is associated with neurodegeneration, the function of neuronal autophagosomes remains incompletely understood. We show that in neurons, autophagosomes promote neuronal complexity and prevent neurodegeneration in vivo via retrograde transport of brain-derived neurotrophic factor (BDNF)-activated TrkB receptors. p150Glued/dynactin-dependent transport of TrkB-containing autophagosomes requires their association with the endocytic adaptor AP-2, an essential protein complex previously thought to function exclusively in clathrin-mediated endocytosis. These data highlight a novel non-canonical function of AP-2 in retrograde transport of BDNF/TrkB-containing autophagosomes in neurons and reveal a causative link between autophagy and BDNF/TrkB signalling.
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Complejo 2 de Proteína Adaptadora/metabolismo , Encéfalo/patología , Receptor trkB/metabolismo , Animales , Autofagosomas , Autofagia , Transporte Biológico , Encéfalo/metabolismo , Factor Neurotrófico Derivado del Encéfalo/metabolismo , Complejo Dinactina/metabolismo , Endocitosis , Ratones , Ratones Noqueados , Proteínas Asociadas a Microtúbulos/metabolismo , Neuronas/metabolismo , Unión Proteica , Ratas Wistar , Transducción de SeñalRESUMEN
Neuronal replacement in the pallial song control nucleus HVC of adult zebra finches constitutes an interesting case of homeostatic plasticity; in spite of continuous addition and attrition of neurons in ensembles that code song elements, adult song remains remarkably invariant. New neurons migrate into HVC and later synapse with their target, arcopallial song nucleus RA (HVCRA). New HVCRA neurons respond to auditory stimuli (in anaesthetised animals), but whether and when they become functionally active during singing is unknown. We studied this, using 5-bromo-2'-deoxyuridine to birth-date neurons, combined with immunohistochemical detection of immediate-early gene (IEG) expression and retrograde tracer injections into RA to track connectivity. Interestingly, singing was followed by IEG expression in a substantial fraction of new neurons that were not retrogradely labelled from RA, suggesting a possible role in HVC-intrinsic network function. As new HVC neurons matured, the proportion of HVCRA neurons that expressed IEGs after singing increased significantly. Since it was previously shown that singing induces IEG expression in HVC also in deaf birds and that hearing song does not induce IEG expression in HVC, our data provide the first direct evidence that new HVC neurons are engaged in song motor behaviour.