Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 67
Filtrar
1.
J Family Med Prim Care ; 13(5): 1875-1880, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38948581

RESUMEN

Background: The World Health Organization (WHO) declared Coronavirus disease-19 (COVID-19) caused by Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2) a pandemic on March 11, 2020. On 16th January 2021, India began its vaccination programme using two COVID-19 vaccines (Covishield and Covaxin). Precautionary dose (booster shots) was administered to health and front-line workers in the beginning and then to all eligible populations. Material and Methods: This was a descriptive observational study conducted in the COVID-19 vaccination centres of Karnal district and the ADR monitoring centre, KCGMC, Karnal. During the visits to vaccination centres, all beneficiaries of the precautionary third dose of COVID-19 vaccines as well as healthcare workers were sensitized to report in case of any adverse event following vaccination as part of the policy of the vaccination programme run by the government and Pharmacovigilance Programme of India. The data were collected in suspected adverse drug reaction (ADR) reporting form version 1.4, and causality assessment was done as per the WHO-UMC scale. The data were analysed as simple proportions and percentages. Results: The booster dose was administered to 72,853 individuals, while the 1st dose and 2nd dose were given to 13,30,042 and 10,73,050, respectively. Only three ADRs were reported with the booster dose in 34 vaccination centres in the Karnal district. These three ADRs were classified as unlikely on causality assessment and hence not included in the analysis. Conclusion: The booster dose administered for the prevention of COVID-19 has been found to be reasonably safe. The population who received COVID-19 booster doses was significantly less than the populations who received the first and second doses, which suggests a low acceptance rate.

2.
Artículo en Inglés | MEDLINE | ID: mdl-38976593

RESUMEN

Psoriasis is a persistent, inflammatory, and autoimmune condition that is difficult to treat. Estimates of the prevalence of psoriasis in people range from 0.27 % (95 % confidence interval 0.17 to 0.36) to 11.4 %, depending on factors such as age, sex, geography, ethnicity, genetics, and environmental factors. While systemic treatments are typically required for patients with moderate-to-severe instances of psoriasis, topical therapies are frequently effective for treating minor forms. In fact, phototherapy is frequently constrained by logistical considerations, and conventional systemic therapies are frequently avoided due to contraindications or the danger of adverse outcomes. In order to better serve the patient and achieve a greater level of quality of life, especially in order to sustain long-term efficacy, there is still a need for innovative therapies, which are always welcomed. Deucravacitinib is a first-in-class oral tyrosine kinase 2 (TYK2) inhibitor that is extremely selective. Through an allosteric mechanism, it stabilises an inhibitory connection between the regulatory and catalytic domains of TYK2's pseudokinase regulatory domain, which is catalytically inactive. This can be used to treat a variety of immune-mediated conditions, such as inflammatory bowel disease, lupus, psoriatic arthritis, and psoriasis. US-FDA has approved this drug on 9 September 2022 for the treatment of adults with moderate-to-severe plaque psoriasis who are candidates for systemic therapy or phototherapy. This article aims to review the current knowledge on the efficacy and safety of deucravacitinib for the management of psoriasis.

4.
J Family Med Prim Care ; 13(3): 838-840, 2024 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-38736802

RESUMEN

Introduction: The study was undertaken to observe the adverse event following immunization (AEFI) to the Covaxin vaccine in young adolescents in the age group of 15-18 years in a district in Northern India. The study was conducted to assess the safety profile of the COVAXIN vaccine. Methodology: This was a prospective observational study conducted at rural and urban health centers of a district in Northern India. We included the beneficiaries of the COVAXIN between the age of 15 and 18 years. The administration of the COVAXIN occurred in our district from January 2022. Periodic visits were conducted to the urban and rural health centers of the city to record any suspected adverse drug reaction following immunization in the defined population. The study was conducted for a period of 1 year (January 2022 to December 2022). Results: A total of 72,771 adolescents (15-18 years) received the first dose of Covaxin and 49,046 received the second dose. No adverse drug event following immunization was reported during the study. Conclusion: Thus, it can be concluded that Covaxin was found to be safe in adolescents (15-18 years).

5.
J Basic Clin Physiol Pharmacol ; 35(3): 121-127, 2024 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-38598858

RESUMEN

The complement is a crucial factor of the innate immune system. However, its activation can lead to various diseases, so it needs to be controlled. In mammals, surface-bound complement regulatory proteins safeguard cells from uncontrolled complement-mediated lysis. One of the human complement regulators is CD55, also known as the decay-accelerating factor (DAF), a single-chain, type I cell surface protein anchored to glycosylphosphatidylinositol (GPI). The genetic loss of the complement regulatory protein CD55 leads to a fatal illness known as CHAPLE disease. The complement and innate immunity become hyperactive in this disease, causing angiopathic thrombosis and protein-losing enteropathy. Patients with CHAPLE disease experience abdominal pain, nausea, vomiting, diarrhea, loss of appetite, weight loss, impaired growth, and swelling. This genetic condition has no known cure, and managing its symptoms can be challenging. Pozelimab, a human monoclonal immunoglobulin IgG4 antibody, is a drug that targets the terminal complement protein C5. The drug has a high affinity for both wild-type and variant human C5. Pozelimab has received designations such as fast track, orphan drug, and rare pediatric disease, making it a significant medical breakthrough. It is currently the only available treatment for this disease. In this review, we have summarized the preclinical and clinical data on pozelimab.


Asunto(s)
Anticuerpos Monoclonales Humanizados , Humanos , Anticuerpos Monoclonales Humanizados/uso terapéutico , Anticuerpos Monoclonales Humanizados/farmacología , Antígenos CD55/metabolismo , Animales , Complemento C5/antagonistas & inhibidores , Enteropatías Perdedoras de Proteínas/tratamiento farmacológico
6.
Eur J Clin Pharmacol ; 80(5): 669-676, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38367045

RESUMEN

BACKGROUND: Obesity is one of the critical public health problems in our society. It leads to various health conditions, such as type 2 diabetes mellitus, cardiovascular disease, hypertension, dyslipidaemia, and non-alcoholic fatty liver disease. With the rising incidence of obesity, there is a growing demand for new therapies which can effectively manage body weight and improve health. CURRENT EVIDENCE: Currently under development, multi-receptor agonist drugs may offer a promising solution to meet this unmet medical need. Retatrutide is a novel triple receptor agonist peptide that targets the glucagon receptor (GCGR), glucose-dependent insulinotropic polypeptide receptor (GIPR), and glucagon-like peptide-1 receptor (GLP-1R). This novel drug has the potential to treat metabolic abnormalities associated with obesity as well as diseases resulting from it due to its distinct mechanism of action. The Phase III trial of this pipeline drug for treating type 2 diabetes mellitus, non-alcoholic fatty liver disease, and obesity started on August 28, 2023. The results of a Phase II clinical trial have demonstrated significant weight reduction in overweight and obese adults. Specifically, the trial reported an average weight loss of 17.5% and 24.4% at 24 and 48 weeks, respectively. CONCLUSIONS: These findings hold promise for the development of effective weight loss interventions in this population group. There is a need for more phase III studies to provide sufficient clinical evidence for the effectiveness of retatrutide, as current evidence is limited to phase II studies and has yet to prove its worth in a larger population. Here, we aimed to provide an overview of retatrutide's safety and effectiveness in treating obesity.


Asunto(s)
Diabetes Mellitus Tipo 2 , Enfermedad del Hígado Graso no Alcohólico , Humanos , Diabetes Mellitus Tipo 2/metabolismo , Drogas en Investigación , Enfermedad del Hígado Graso no Alcohólico/complicaciones , Obesidad/tratamiento farmacológico , Obesidad/metabolismo , Pérdida de Peso , Receptor del Péptido 1 Similar al Glucagón/agonistas , Receptor del Péptido 1 Similar al Glucagón/metabolismo , Receptor del Péptido 1 Similar al Glucagón/uso terapéutico
7.
Cureus ; 16(1): e53052, 2024 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-38410313

RESUMEN

Background The intensive care unit (ICU) represents an important platform for conducting drug utilization analysis using defined daily dose (DDD)/100 bed-days and the financial burden of treatment as patients are seriously ill and are often suffering from chronic critical illnesses. Therefore, in this study, we evaluated the drug utilization patterns and cost of treatment in the ICU. Methods A retrospective observational analysis of the medical records obtained for the medical ICU of an apex tertiary care teaching hospital in central India was conducted for a period of three years from 2017 to 2019. All the patients admitted to the medical ICU during the study tenure were included in the study. Patients hospitalized in neonatal intensive care unit (NICU), pediatric intensive care unit (PICU), and surgical ICU were excluded from the study. The socio-demographic and clinical data, utilization of different classes of drugs, WHO-Anatomic Therapeutic Chemical (WHO-ATC) classification, DDD/100 bed days, hospital stay, etc. were analyzed. A partial pharmaco-economic analysis of the average cost of admission to patients was done. Results Data from 280 patients was assessed. The mean age was 47 ± 19.18 years and 58% were males. Antibiotics and injections were prescribed to 96% and 97.5% of the patients, respectively, during their ICU stay (median: seven days). Antimicrobial drugs were most frequently prescribed (n=1096, 68%); the most common were beta-lactams and carbapenems, followed by drugs acting on the central nervous system (5%) and cardiovascular system (4.3%). Cefoperazone/sulbactum, ceftriaxone, and piperacillin/tazobactam were the most utilized antibiotics with 8, 16, and 6 DDD/100 bed-days, respectively, while proton pump inhibitors, analgesics, and anti-epileptics were the most frequently prescribed non-antimicrobial drug class. The median cost of treatment per ICU admission was Indian Rupees (INR) 23,347 (IQR 12,552- 65,524). Conclusion Drug utilization assessment provides crucial information for understanding the usage of drugs in the settings of the ICU, and should be conducted regularly to help in the proper planning and implementation of rational drug use. Treatment costs reflect the high economic burden seen in ICU admissions.

8.
J Basic Clin Physiol Pharmacol ; 35(1-2): 25-29, 2024 Jan 01.
Artículo en Inglés | MEDLINE | ID: mdl-38053285

RESUMEN

The humanised monoclonal antibody donanemab is being developed to treat early onset Alzheimer's disease (AD). This drug targets N-truncated pyroglutamate amyloid-peptide at position 3 (N3pG), a modified form of deposited amyloid-peptide. The symptoms of Alzheimer's disease include gradual memory loss and other cognitive impairments. This disease is characterized by amyloid plaques, which are formed as a result of an accumulation of amyloid-(A-ß) peptides. Despite granting donanemab breakthrough therapy designation in June 2021, the FDA rejected donanemab's accelerated approval application in January 2023, due to inadequate safety data. According to the baseline amyloid level, the time to achieve plaque clearance (amyloid plaque level <24.1 centiloids) varied. Patients with higher baseline levels were more likely to achieve amyloid clearance. The safety of the drug was demonstrated by amyloid-related imaging abnormalities (ARIA), which ranged from 26.1 to 30.5 % in the studies. Clinical trial results have shown that donanemab delays cognitive and functional deterioration in patients with mild to moderate AD. However, it is not yet known whether donenameb offers therapeutic benefits that can change and improve the clinical condition of AD patients. To achieve significant clinical benefits in AD patients with cognitive impairment, further studies may be needed to investigate the interaction between A-ß plaque reduction and toxic tau levels.


Asunto(s)
Enfermedad de Alzheimer , Humanos , Enfermedad de Alzheimer/tratamiento farmacológico , Péptidos beta-Amiloides , Anticuerpos Monoclonales Humanizados/uso terapéutico
9.
Eur J Clin Pharmacol ; 79(5): 609-616, 2023 May.
Artículo en Inglés | MEDLINE | ID: mdl-37004543

RESUMEN

Type 1 diabetes mellitus (T1DM) is an autoimmune condition driven by T lymphocytes that specifically declines the function of beta cells of pancreas. Immunological treatments aim to stop this decline in ß-cell function thus preventing TIDM. Although TIDM occur at any age, it is one of the most common chronic disorders in children. T1DM accounts for 5 to 10% of all cases of diabetes amounting 21-42 million affected persons. Teplizumab is a novel drug recently approved by the US FDA for the treatment of T1DM. This drug reduces abnormal glucose tolerance who are at high risk for developing T1DM and have antibodies suggesting an immunological attack on their pancreas. A 14-day infusion of the drug prevents T cells' attack of the insulin-producing cells of the pancreas. Adverse events due to teplizumab reported so far mild and of limited duration. This review gives an overview of the preclinical and clinical research on teplizumab for their role in new-onset T1DM.


Asunto(s)
Enfermedades Autoinmunes , Diabetes Mellitus Tipo 1 , Niño , Humanos , Diabetes Mellitus Tipo 1/tratamiento farmacológico , Diabetes Mellitus Tipo 1/prevención & control , Insulina , Anticuerpos Monoclonales Humanizados/uso terapéutico
11.
J Basic Clin Physiol Pharmacol ; 34(2): 161-168, 2023 Mar 01.
Artículo en Inglés | MEDLINE | ID: mdl-36607905

RESUMEN

The COVID-19 pandemic remains a severe global threat, with the world engulfed in the struggle against the disease's second or third waves, which are approaching frightening proportions in terms of cases and mortality in many nations. Despite the critical need for effective therapy, there is still uncertainty about the optimal practices for treating COVID-19 with various pharmaceutical approaches. This being third year, global immunity and eradication of SARS-CoV-2 is currently seems to be out of reach. Efforts to produce safe and effective vaccinations have shown promise, and progress is being made. Additional therapeutic modalities, as well as vaccine testing in children, are required for prophylaxis and treatment of high-risk individuals. As a result, neutralising antibodies and other comparable therapeutic options offer a lot of promise as immediate and direct antiviral medications. Bispecific antibodies offer a lot of potential in COVID-19 treatment because of their qualities including stability, small size and ease of manufacture. These can be used to control the virus's infection of the lungs because they are available in an inhalational form. To combat the COVID-19 pandemic, innovative approaches with effective nanobodies, high-expression yield and acceptable costs may be required.


Asunto(s)
Anticuerpos Biespecíficos , COVID-19 , Niño , Humanos , SARS-CoV-2 , COVID-19/terapia , Anticuerpos Biespecíficos/uso terapéutico , Pandemias/prevención & control , Tratamiento Farmacológico de COVID-19
12.
J Basic Clin Physiol Pharmacol ; 34(4): 429-444, 2023 Jul 01.
Artículo en Inglés | MEDLINE | ID: mdl-35503307

RESUMEN

The COVID-19 pandemic continues to pose a serious global challenge, with the world engulfed in fighting second, third and fourth waves of the disease, which is reaching scary proportions in terms of cases and mortality in countries like India. Despite the urgent need of proven management protocols, there is still confusion about the best practices for treating COVID-19 with different pharmaceutical interventions. Antimicrobials are empirically used in COVID-19 patients. During the initial phase of this pandemic, hydroxychloroquine, ivermectin, azithromycin and doxycycline were widely suggested for possible prophylaxis or treatment for COVID-19 in outpatient as well as hospitalized settings. Various national and international guidelines recommended its use. However, cumulative evidence from subsequent clinical trials has revealed no significant clinical benefits in any setting, with the risk of adverse effects being high particularly in combination with azithromycin. Yet, there is continued use of antimicrobials particularly in outpatient settings which should be avoided because there is no justifiable rationale for doing so. Antimicrobial resistance (AMR) was one of the top problems for global public health before the coronavirus 2019 (COVID-19) pandemic began. AMR, which is already a difficult problem, must now be handled in the context of a changing healthcare sector.


Asunto(s)
Antiinfecciosos , COVID-19 , Humanos , Azitromicina/uso terapéutico , SARS-CoV-2 , Pandemias
14.
J Basic Clin Physiol Pharmacol ; 33(6): 727-733, 2022 Nov 01.
Artículo en Inglés | MEDLINE | ID: mdl-36279146

RESUMEN

Idiotype-based therapeutics have failed to deliver their promise, necessitating rethinking of the concept and its potential to develop a viable immunotherapy method. The idiotype based hypothesis is discussed in this paper in order to produce effective anti-idiotype vaccinations. Polyclonal anti-idiotype reagents have been shown to be more successful in animal models, and a better understanding of the immune response in humans supports the idea that polyclonal anti-idiotype vaccines will be more effective than monoclonal-based anti-idiotype vaccines. This innovative approach can be used to produce therapeutic antibodies in a Biotech-standard manner. The idiotype network has been tweaked in the lab to provide protection against a variety of microbiological diseases. Antibodies to image-idiotype antigens, both internal and non-internal, can elicit unique immune responses to antigens. The current outbreak of severe acute respiratory syndrome 2 (SARS-2) has presented a fantastic chance to use idiotype/anti-idiotype antibodies as a protective regimen, which might be used to treat COVID-19 patients. The development of various effective vaccinations has been crucial in the pandemic's management, but their effectiveness has been limited. In certain healthy people, the development of viral variations and vaccinations can be linked to rare off-target or hazardous effects, such as allergic responses, myocarditis and immune-mediated thrombosis and thrombocytopenia. Many of these occurrences are most likely immune-mediated. The current analysis reveals successful idiotype/anti-idiotype antibody uses in a variety of viral illnesses, emphazising their importance in the COVID-19 pandemic.


Asunto(s)
COVID-19 , Vacunas , Humanos , Animales , Anticuerpos Monoclonales/uso terapéutico , Pandemias/prevención & control , Idiotipos de Inmunoglobulinas , Anticuerpos Antiidiotipos/uso terapéutico
15.
J Basic Clin Physiol Pharmacol ; 33(6): 715-726, 2022 Nov 01.
Artículo en Inglés | MEDLINE | ID: mdl-35428040

RESUMEN

After healing from COVID-19, patients often experience a slew of symptoms known as post COVID-19 sequelae. Despite the fact that the SARS-CoV-2 pandemic is still ongoing, post-Covid-19 syndrome is already a difficult problem to address: long-term multiorgan sequelae, while frequently described, have yet to be systematized. As a result, post-Covid-19 syndrome can have a major influence on surviving patients' working capacity as well as their personal lives. The clinical spectrum and long-term course of this clinical entity must be better understood. Post-Covid syndrome affects a wide spectrum of individuals (16-87%), with pneumological and cognitive symptoms being the most common. Pulmonary fibrosis was the most common organic consequence seen in post-Covid patients. In conclusion, post-Covid-19 syndrome can have a major impact on the health of survivors. Working-age patients should seek rehabilitation and follow-up in interdisciplinary rehabilitation programmes. Given the pandemic's global extent, it's obvious that COVID-19-related healthcare demands will continue to climb for the foreseeable future. For COVID-19 survivors' long-term mental and physical health, present outpatient infrastructure will be utilised, scalable healthcare models will be built, and cross-disciplinary collaboration will be required.


Asunto(s)
COVID-19 , Humanos , COVID-19/complicaciones , SARS-CoV-2 , Pandemias , Síndrome Post Agudo de COVID-19
16.
J Basic Clin Physiol Pharmacol ; 33(1): 13-16, 2022 Jan 07.
Artículo en Inglés | MEDLINE | ID: mdl-34995021

RESUMEN

Antibody-dependent enhancement (ADE) can be seen in a variety of viruses. It has a deleterious impact on antibody treatment of viral infection. This effect was first discovered in the dengue virus, and it has since been discovered in the coronavirus. Over 213 million people have been affected by the rapid spread of the newly emerging coronavirus, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which causes coronavirus disease 2019 (COVID-19). The new coronavirus offers a significant threat and has sparked widespread concern. ADE in dengue virus and other viruses are discussed with possible effect on COVID-19 treatment and vaccine development will need to consider this phenomenon to ensure it is mitigated and avoided altogether. In these case scenarios, the role of ADE and its clinical consequences remains to be explored for this newly detected virus.


Asunto(s)
Acrecentamiento Dependiente de Anticuerpo , Tratamiento Farmacológico de COVID-19 , COVID-19 , COVID-19/inmunología , Humanos
17.
J Basic Clin Physiol Pharmacol ; 33(6): 803-814, 2022 Nov 01.
Artículo en Inglés | MEDLINE | ID: mdl-34449177

RESUMEN

OBJECTIVES: The study was conducted to assess patterns of prescribed drug therapy and clinical predictors of need for therapy escalation in outpatients with diabetes mellitus (DM). METHODS: This was a prospective cohort study, conducted at an apex tertiary care teaching hospital in central India for a period of 18 months. The demographic, clinical, and treatment details on the baseline and follow up visits were collected from the patients' prescription charts. Glycemic control, adherence, pill burdens along with pattern of antidiabetic therapy escalation, and deescalations were analyzed. RESULTS: A total of 1,711 prescriptions of 925 patients of diabetes with a mean age of 53.81 ± 10.42 years and duration of disease of 9.15 ± 6.3 years were analyzed. Approximately half of the patients (n=450) came for ≥1 follow up visits. Hypertension (59.35%) was the most common comorbidity followed by dyslipidemia and hypothyroidism. The mean total daily drugs and pills per prescription were 4.03 ± 1.71 and 4.17 ± 1.38, respectively. Metformin (30.42%) followed by sulphonylureas (SUs) (21.39%) constituted majority of the AHA's and dual and triple drug therapy regimens were most commonly prescribed. There were improvements in HbA1c, fasting/postprandial/random blood sugar (FBS/PPBS/RBS) as well as adherence to medication, diet, and exercise in the follow up visits. Among patients with follow ups, therapy escalations were found in 31.11% patients, among whom dose was increased in 12.44% and drug was added in 17.28%. Apart from Hb1Ac, FBS, and PPBS levels (p<0.001), characteristics such as age, BMI, duration of diagnosed diabetes, presence of hypertension and dyslipidemia, and daily pill burdens were found to be significantly higher in the therapy escalation group (p<0.05). Inadequate medication adherence increased the relative risk (RR) of therapy escalation by almost two times. CONCLUSIONS: Disease and therapy patterns are reflective of diabetes care as expected at a tertiary care center. Higher BMI, age, pill burden, duration of diabetes, presence of comorbidities, and poor medication adherence may be the predictors of therapy escalation independent of glycemic control and such patients should be more closely monitored.


Asunto(s)
Diabetes Mellitus Tipo 2 , Hipertensión , Humanos , Adulto , Persona de Mediana Edad , Hemoglobina Glucada/análisis , Control Glucémico , Glucemia , Diabetes Mellitus Tipo 2/tratamiento farmacológico , Diabetes Mellitus Tipo 2/epidemiología , Pacientes Ambulatorios , Centros de Atención Terciaria , Estudios Prospectivos , Hipoglucemiantes/uso terapéutico , Hipertensión/tratamiento farmacológico , Hipertensión/epidemiología , Hipertensión/inducido químicamente
18.
J Family Med Prim Care ; 10(9): 3303-3308, 2021 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-34760748

RESUMEN

BACKGROUND: The Pharmacovigilance Program of India recommends the use of the World Health Organization-Uppsala Monitoring Centre (WHO-UMC) scale, while many clinicians prefer the Naranjo algorithm for its simplicity. In the present study, we assessed agreement between the two widely used causality assessment scales, that is, the WHO-UMC criteria and the Naranjo algorithm. MATERIALS AND METHODS: In this study, 842 individual case safety reports were randomly selected from 1000 spontaneously reported forms submitted to the ADR Monitoring Center at a tertiary healthcare Institute in Central India between 2016 and 2018. Two well-trained independent groups performed the causality assessment. One group performed a causality assessment of the 842 ADRs using the WHO-UMC criteria and the other group performed the same using the Naranjo algorithm. The agreement between two ADR causality scales was assessed using the weighted kappa (κ) test. RESULTS: Cohen's kappa coefficient (κ) statistical test was applied between the two scales (WHO-UMC scale and Naranjo algorithm) to find out the agreement between these two scales. "No" agreement was found between the two scales {Kappa statistic with 95% confidence interval = 0.048 (P < 0.001)}. CONCLUSION: There was no agreement found between the WHO-UMC criteria and the Naranjo algorithm in our study.

19.
J Family Med Prim Care ; 10(8): 3163-3164, 2021 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-34660465
20.
RNA Biol ; 18(12): 2376-2389, 2021 12.
Artículo en Inglés | MEDLINE | ID: mdl-33904382

RESUMEN

The Dynein motor is responsible for the localization of numerous mRNAs within Drosophila oocytes and embryos. The RNA binding protein, Egalitarian (Egl), is thought to link these various RNA cargoes with Dynein. Although numerous studies have shown that Egl is able to specifically associate with these RNAs, the nature of these interactions has remained elusive. Egl contains a central RNA binding domain that shares limited homology with an exonuclease, yet Egl binds to RNA without degrading it. Mutations have been identified within Egl that disrupt its association with its protein interaction partners, BicaudalD (BicD) and Dynein light chain (Dlc), but no mutants have been described that are specifically defective for RNA binding. In this report, we identified a series of positively charged residues within Egl that are required for RNA binding. Using corresponding RNA binding mutants, we demonstrate that specific RNA cargoes are more reliant on maximal Egl RNA biding activity for their correct localization in comparison to others. We also demonstrate that specification and maintenance of oocyte fate requires maximal Egl RNA binding activity. Even a subtle reduction in Egl's RNA binding activity completely disrupts this process. Our results show that efficient RNA localization at the earliest stages of oogenesis is required for specification of the oocyte and restriction of meiosis to a single cell.


Asunto(s)
Proteínas de Drosophila/metabolismo , Drosophila melanogaster/metabolismo , Oocitos/fisiología , Oogénesis , ARN Mensajero/metabolismo , Proteínas de Unión al ARN/metabolismo , Animales , Comunicación Celular , Proteínas de Drosophila/genética , Drosophila melanogaster/genética , Drosophila melanogaster/crecimiento & desarrollo , Femenino , Oocitos/citología , Unión Proteica , ARN Mensajero/genética , Proteínas de Unión al ARN/genética
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA
...