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1.
BMJ Open ; 13(1): e065698, 2023 01 31.
Artículo en Inglés | MEDLINE | ID: mdl-36720577

RESUMEN

OBJECTIVES: To explore the experience of caring for children with tracheostomies from the perspectives of parents and health professional caregivers. DESIGN: Qualitative semistructured interview study. SETTING: One region in England covered by a tertiary care centre that includes urban and remote rural areas and has a high level of deprivation. PARTICIPANTS: A purposive sample of health professionals and parents who care for children who have, or have had, tracheostomies and who received care at the tertiary care centre. INTERVENTION: Interviews undertaken by telephone or video link. PRIMARY AND SECONDARY OUTCOME MEASURES: Qualitative reflexive thematic analysis with QSR Nvivo 12. RESULTS: This paper outlines key determinants and mediators of the experiences of caregiving and the impact on psychological and physical health and quality of life of parents and their families, confidence of healthcare providers and perceived quality of care. For parents, access to care packages and respite care at home as well as communication and relationships with healthcare providers are key mediators of their experience of caregiving, whereas for health professionals, an essential influence is multidisciplinary team working and support. We also highlight a range of challenges focused on the shared care space, including: a lack of standardisation in access to different support teams, care packages and respite care, irregular training and updates, and differences in health provider expertise and experiences across departments and shift patterns, exacerbated in some settings by limited contact with children with tracheostomies. CONCLUSIONS: Understanding the experiences of caregiving can help inform measures to support caregivers and improve quality standards. Our findings suggest there is a need to facilitate further standardisation of care and support available for parent caregivers and that this may be transferable to other regions. Potential solutions to be explored could include the development of a paediatric tracheostomy service specification, increasing use of paediatric tracheostomy specialist nurse roles, and addressing the emotional and psychological support needs of caregivers.


Asunto(s)
Calidad de Vida , Traqueostomía , Humanos , Niño , Personal de Salud , Padres , Investigación Cualitativa
2.
Arch Dis Child ; 107(3): e23, 2022 03.
Artículo en Inglés | MEDLINE | ID: mdl-34887248

RESUMEN

OBJECTIVES: To explore the impact of the COVID-19 pandemic on the experiences of caregivers of children with tracheostomies. DESIGN: Qualitative semistructured interviews. SETTING: All participants were currently, or had previously cared for, a tracheostomised child who had attended a tertiary care centre in the North of England. Health professionals were purposively sampled to include accounts from a range of professions from primary, community, secondary and tertiary care. PARTICIPANTS: Carers of children with tracheostomies (n=34), including health professionals (n=17) and parents (n=17). INTERVENTIONS: Interviews were undertaken between July 2020 and February 2021 by telephone or video link. MAIN OUTCOME MEASURE: Qualitative reflexive thematic analysis with QSR NVivo V.12. RESULTS: The pandemic has presented an additional and, for some, substantial challenge when caring for tracheostomised children, but this was not always felt to be the most overriding concern. Interviews demonstrated rapid adaptation, normalisation and varying degrees of stoicism and citizenship around constantly changing pandemic-related requirements, rules and regulations. This paper focuses on four key themes: 'reconceptualising safe care and safe places'; 'disrupted support and isolation'; 'relationships, trust and communication'; and 'coping with uncertainty and shifting boundaries of responsibility'. These are described within the context of the impact on the child, the emotional and physical well-being of carers and the challenges to maintaining the values of family-centred care. CONCLUSIONS: As we move to the next phase of the pandemic, we need to understand the impact on vulnerable groups so that their needs can be prioritised.


Asunto(s)
COVID-19/epidemiología , Cuidadores/psicología , Padres/psicología , Traqueostomía , Adaptación Psicológica , Niño , Humanos , Pandemias , Grupo de Atención al Paciente , Relaciones Profesional-Familia , SARS-CoV-2 , Aislamiento Social , Apoyo Social , Confianza
4.
Eur J Cancer Care (Engl) ; 30(4): e13474, 2021 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-34086378

RESUMEN

INTRODUCTION: Patients with advanced-stage head and neck cancers (HNC) endure a significant symptom burden and suffer greatly towards the end of their lives. Qualitative evidence can provide insight into how existing services meet their needs. We aimed to synthesise qualitative data from patients with advanced HNC and their carers to inform improvements to services and care. METHODS: A systematic search was conducted in MEDLINE and EMBASE for studies containing qualitative data from patients with advanced HNC and their carers. An interpretive account was generated using the meta-ethnography methodology. RESULTS: We identified 8 studies including 38 patients and 25 carers. Twenty-six themes were synthesised into five concepts: psychological impact and adjustment, physical limitations and deliverance of symptomatic care, communication and information needs from healthcare professionals, social support and dependence, and needs of the primary caregiver. We identified that patients had complex psychological needs, centred on uncertainty and fear of suffering. Patients desired full information and found poor communication highly distressing. There was a dearth of literature on the subjective impact of physical limitations. Patients became reliant on social networks, and those with lower quality relationships coped poorly. However, caregivers struggled to meet patients' complex needs, resulting in distress and isolation. CONCLUSIONS: Patients with advanced HNCs have complex needs that are not met in current systems. Further qualitative work focusing on the physical and psychological impact of advanced HNC would be of value.


Asunto(s)
Cuidadores , Neoplasias de Cabeza y Cuello , Adaptación Psicológica , Antropología Cultural , Neoplasias de Cabeza y Cuello/terapia , Humanos , Investigación Cualitativa , Apoyo Social
5.
Trials ; 21(1): 179, 2020 Feb 13.
Artículo en Inglés | MEDLINE | ID: mdl-32054508

RESUMEN

BACKGROUND: Septoplasty (surgery to straighten a deviation in the nasal septum) is a frequently performed operation worldwide, with approximately 250,000 performed annually in the US and 22,000 in the UK. Most septoplasties aim to improve diurnal and nocturnal nasal obstruction. The evidence base for septoplasty clinical effectiveness is hitherto very limited. AIMS: To establish, and inform guidance for, the best management strategy for individuals with nasal obstruction associated with a deviated septum. METHODS/DESIGN: A multicentre, mixed-methods, open label, randomised controlled trial of septoplasty versus medical management for adults with a deviated septum and a reduced nasal airway. Eligible patients will have septal deflection visible at nasendoscopy and a nasal symptom score ≥ 30 on the NOSE questionnaire. Surgical treatment comprises septoplasty with or without reduction of the inferior nasal turbinate on the anatomically wider side of the nose. Medical management comprises a nasal saline spray followed by a fluorinated steroid spray daily for six months. The recruitment target is 378 patients, recruited from up to 17 sites across Scotland, England and Wales. Randomisation will be on a 1:1 basis, stratified by gender and severity (NOSE score). Participants will be followed up for 12 months post randomisation. The primary outcome measure is the total SNOT-22 score at 6 months. Clinical and economic outcomes will be modelled against baseline severity (NOSE scale) to inform clinical decision-making. The study includes a recruitment enhancement process, and an economic evaluation. DISCUSSION: The NAIROS trial will evaluate the clinical effectiveness and cost-effectiveness of septoplasty versus medical management for adults with a deviated septum and symptoms of nasal blockage. Identifying those individuals most likely to benefit from surgery should enable more efficient and effective clinical decision-making, and avoid unnecessary operations where there is low likelihood of patient benefit. TRIAL REGISTRATION: EudraCT: 2017-000893-12, ISRCTN: 16168569. Registered on 24 March 2017.


Asunto(s)
Tratamiento Conservador/métodos , Obstrucción Nasal/terapia , Tabique Nasal/cirugía , Deformidades Adquiridas Nasales/complicaciones , Rinoplastia/métodos , Administración Intranasal , Adulto , Toma de Decisiones Clínicas/métodos , Ensayos Clínicos Fase III como Asunto , Tratamiento Conservador/economía , Análisis Costo-Beneficio , Endoscopía , Inglaterra , Femenino , Humanos , Masculino , Estudios Multicéntricos como Asunto , Obstrucción Nasal/diagnóstico , Obstrucción Nasal/etiología , Tabique Nasal/diagnóstico por imagen , Tabique Nasal/lesiones , Deformidades Adquiridas Nasales/terapia , Selección de Paciente , Calidad de Vida , Ensayos Clínicos Controlados Aleatorios como Asunto , Rinoplastia/economía , Solución Salina/administración & dosificación , Escocia , Autoinforme/estadística & datos numéricos , Índice de Severidad de la Enfermedad , Esteroides Fluorados/administración & dosificación , Resultado del Tratamiento , Gales
6.
Eur Arch Otorhinolaryngol ; 277(3): 947-952, 2020 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-31915919

RESUMEN

PURPOSE: A multidisciplinary team (MDT) approach to cancer management is gold-standard. With an increasing disease incidence and growing research into human papillomavirus (HPV)-related oropharyngeal cancer (OPC), updated UK management guidelines were recently published. This study aimed to evaluate the MDT decision-making process among OPC patients at a tertiary centre. METHODS: MDT meetings over a 12-month period were analysed retrospectively. MDT decisions were compared with guidelines and patient records examined to identify decision implementation. Reasons behind any discordant decisions were explored. RESULTS: This study included 140 OPC patients. Thirty-three (23.6%) were not tested for HPV. Patients over 70 years with a smoking history treated palliatively were less likely to be tested (P = 0.017). Eighty-five percent of MDT decisions followed guidelines with the majority not complying (76.2%) related to patient comorbidity. Ten decisions (7.1%) were not implemented. Reasons included: Seven due to patient choice, of which four patients (57.1%) were only seen following the MDT meeting, and three due to clinician decisions as new clinical information emerged. CONCLUSION: The majority of MDT decisions followed guidelines and any discordant decisions were justifiable. Discussing management options with patients beforehand facilitates decision implementation as decisions can potentially change after seeing the patient. Progress is still needed with regards to HPV testing. Reasons for not testing could include subliminal decision-making among clinicians, and patients falling between centres. Crucially, the role of the MDT in head and neck cancer should be to ratify decisions rather than making them, hence the need to see patients prior to MDT discussion.


Asunto(s)
Neoplasias Orofaríngeas , Grupo de Atención al Paciente , Toma de Decisiones , Humanos , Neoplasias Orofaríngeas/diagnóstico , Neoplasias Orofaríngeas/terapia , Selección de Paciente , Estudios Retrospectivos
7.
Head Neck ; 38 Suppl 1: E631-7, 2016 04.
Artículo en Inglés | MEDLINE | ID: mdl-25832305

RESUMEN

BACKGROUND: The purpose of this study was to use time trade-off to assess the factors influencing patients' decisions in advanced laryngeal cancer. Time trade-off is a well-established method of assessing how individuals value a particular health state. METHODS: We developed vignettes depicting life after chemoradiotherapy or laryngectomy. One hundred fourteen participants ranked them, assigned utility values, and rated the importance of survival on treatment choice. RESULTS: Chemoradiotherapy was preferred by 62% and laryngectomy by 38%. Chemoradiotherapy optimal outcome had the highest mean utility value (0.64) followed by total laryngectomy optimal outcome (0.56). Total laryngectomy poor outcome (0.33) was equivalent to chemoradiotherapy poor outcome (0.32).The average survival advantage required for a participant to change their preferred choice was 2.1 years. CONCLUSION: The functional treatment outcome had a greater effect on health state utility values than treatment modality. In many individuals, larynx conservation may not be the primary consideration in treatment preference. © 2015 Wiley Periodicals, Inc. Head Neck 38: E631-E637, 2016.


Asunto(s)
Quimioradioterapia , Neoplasias Laríngeas/terapia , Laringectomía , Calidad de Vida , Anciano , Femenino , Humanos , Laringe/cirugía , Masculino , Prioridad del Paciente , Resultado del Tratamiento
9.
J Androl ; 33(6): 1068-74, 2012.
Artículo en Inglés | MEDLINE | ID: mdl-22879531

RESUMEN

The proposal to produce this final commemorative issue for the Journal of Andrology arose during our regular discussions as current editors soon after it was announced that the Journal would complete its own life course and merge into a new publication (to be named Andrology) with the International Journal of Andrology. We considered the momentous occasion to be one that should be celebrated with an enduring tribute in recognition of the Journal's exceptional 33-year existence. Among the various contributions sought for inclusion in this issue, we envisioned an article assembling collected short essays from all living former editors drawing on notable events and highlights, if not less well-known challenges and successes arising during their editorship eras. We thought that any such production of musings, viewpoints, and most of all words of wisdom from those who have had major roles in the direction and accomplishments of the Journal would offer an illuminating read for the society's members and friends and provide all readers another venue to share in and enjoy the Journal's great history. We are enthralled to have gathered these collections, all personal compositions of the former editors-in-chief, and for their effort that has helped us complete this special endeavor we express to them our tremendous gratitude. Serving as the Journal's last editors, we are also grateful to contribute our essay at the very end as part of this joyous chronicle.


Asunto(s)
Andrología , Publicaciones Periódicas como Asunto/historia , Edición , Ética en Investigación , Historia del Siglo XX , Historia del Siglo XXI , Humanos , Masculino , Edición/historia , Mala Conducta Científica , Sociedades Médicas , Sociedades Científicas , Estados Unidos
10.
Molecules ; 15(9): 6399-410, 2010 Sep 14.
Artículo en Inglés | MEDLINE | ID: mdl-20877231

RESUMEN

Three 18-residue peptides with the sequence Glp-Asp-Thr-Thr-Asp-Glu-Trp-Asp-Arg-Asp-Leu-Glu-Asn-Leu-Ser-Thr-Thr-Lys, taken from the N-terminus of the rat epididymal cysteine-rich secretory protein (Crisp-1) that is important in the fertilization process, were prepared by Fmoc solid-phase synthesis using a convergent strategy. These peptides were the parent sequence, plus two possible α-O-linked T(N) antigen-containing glycopeptides with a Thr(α-D-GalNAc) residue in place of either Thr3 or Thr4. During chain assembly, two deletion peptides [des-Asp2 and des-Thr(Ac(3)-α-D-GalNAc)] and one terminated peptide [N-acetylated 14-mer] arose, as did several peptides in which aspartimide formation had occurred at each of the four possible positions in the sequence. These by-products totaled ~20% of the desired product; they were recognized by HPLC and ESI-MS and removed during the intermediate purifications. Final products, obtained in 15-21% overall yields, were characterized by HPLC purities and ESI-MS. Circular dichroism (CD) spectra for all three purified peptides, recorded in pure water and in trifluoroethanol-H(2)O (1:1), revealed that the presence of a sugar moiety does not significantly impact the sampled conformations. Future biological evaluation could elucidate the nature and locus of sugar modification of Crisp-1, and provide insight as to why Crisp-1 protein E binds sperm irreversibly, in contrast to protein D that lacks a sugar near the N-terminus and only binds sperm loosely.


Asunto(s)
Proteínas Secretorias del Epidídimo/química , Glicoproteínas de Membrana/síntesis química , Fragmentos de Péptidos/síntesis química , Animales , Glicopéptidos/síntesis química , Glicosilación , Fragmentos de Péptidos/aislamiento & purificación , Conformación Proteica , Ratas
11.
Biol Reprod ; 79(6): 1046-53, 2008 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-18703418

RESUMEN

Cysteine-rich secretory protein 1 (CRISP1) is a secretory glycoprotein produced by the rat epididymal epithelium in two forms, referred to as proteins D and E. CRISP1 has been implicated in sperm-egg fusion and has been shown to suppress capacitation in rat sperm. Several studies have suggested that CRISP1 associates transiently with the sperm surface, whereas others have shown that at least a portion of CRISP1 persists on the surface. In the present study, we demonstrate that protein D associates transiently with the sperm surface in a concentration-dependent manner, exhibiting saturable binding to both caput and cauda sperm in a concentration range that is consistent with its capacitation-inhibiting activity. In contrast, protein E persists on the sperm surface after all exogenous protein D has been dissociated. Comparison of caput and cauda sperm reveal that protein E becomes bound to the sperm in the cauda epididymidis. We show that protein E associates with caput sperm, which do not normally have it on their surfaces, in vitro in a time- and temperature-dependent manner. These studies demonstrate that most CRISP1 interacts with sperm transiently, possibly with a specific receptor on the sperm surface, consistent with its action in suppressing capacitation during epididymal storage of sperm. These studies also confirm a tightly bound population of protein E that could act in the female tract.


Asunto(s)
Epidídimo/fisiología , Glicoproteínas de Membrana/genética , Glicoproteínas de Membrana/fisiología , Espermatozoides/fisiología , Acrosoma/metabolismo , Acrosoma/ultraestructura , Animales , Western Blotting , Técnicas de Cocultivo , Detergentes/farmacología , Proteínas Secretorias del Epidídimo , Epidídimo/citología , Glucósidos/farmacología , Inmunohistoquímica , Indicadores y Reactivos , Masculino , Glicoproteínas de Membrana/biosíntesis , Unión Proteica , Ratas , Ratas Sprague-Dawley , Temperatura
12.
Asian J Androl ; 9(4): 508-14, 2007 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-17589788

RESUMEN

Cysteine-rich secretory protein-1 (CRISP-1) is a glycoprotein secreted by the epididymal epithelium. It is a member of a large family of proteins characterized by two conserved domains and a set of 16 conserved cysteine residues. In mammals, CRISP-1 inhibits sperm-egg fusion and can suppress sperm capacitation. The molecular mechanism of action of the mammalian CRISP proteins remains unknown, but certain non-mammalian CRISP proteins can block ion channels. In the rat, CRISP-1 comprises two forms referred to as Proteins D and E. Recent work in our laboratory demonstrates that the D form of CRISP-1 associates transiently with the sperm surface, whereas the E form binds tightly. When the spermatozoa are washed, the E form of CRISP-1 persists on the sperm surface after all D form has dissociated. Cross-linking studies demonstrate different protein-protein interaction patterns for D and E, although no binding partners for either protein have yet been identified. Mass spectrometric analyses revealed a potential post-translational modification on the E form that is not present on the D form. This is the only discernable difference between Proteins D and E, and presumably is responsible for the difference in behavior of these two forms of rat CRISP-1. These studies demonstrate that the more abundant D form interacts with spermatozoa transiently, possibly with a specific receptor on the sperm surface, consistent with a capacitation-suppressing function during sperm transit and storage in the epididymis, and also confirm a tightly bound population of the E form that could act in the female reproductive tract.


Asunto(s)
Glicoproteínas de Membrana/genética , Espermatozoides/fisiología , Secuencia de Aminoácidos , Animales , Secuencia Conservada , Humanos , Masculino , Mamíferos , Glicoproteínas de Membrana/metabolismo , Datos de Secuencia Molecular , Ratas
13.
Mol Cell Endocrinol ; 250(1-2): 122-7, 2006 May 16.
Artículo en Inglés | MEDLINE | ID: mdl-16414181

RESUMEN

Crisp-1 is a member of the cysteine-rich secretory protein family. This family of proteins is characterized by the presence of 16 conserved cysteine residues, the characteristic from which the family name is derived. Members of the Crisp protein family are found in the secretions of the reproductive tract and salivary glands, including venom toxins from several species of snakes and lizards. The Crisp proteins are modular, each containing an amino terminal pathogenesis-related (PR)-like domain and a carboxyl terminal cysteine-rich domain (CRD) connected by a hinge region. Sequence and structural similarities to proteins with known functions suggest that the Crisp family of proteins may act by regulating cellular ion channels. Rat Crisp-1 is synthesized as two distinct isoforms (referred to as Proteins D and E) by the epididymal epithelium and both are secreted into the luminal fluid where they interact with spermatozoa. Our laboratory has correlated Crisp-1 binding to sperm with inhibiting the signaling cascades that initiate capacitation while others have shown that blocking Crisp-1 binding sites on oocytes interferes with sperm-egg fusion. We hypothesize that the D and E populations of rat Crisp-1 have different interactions with sperm that modulate these distinct biological activities. Through tandem mass spectrometry (MS/MS) and monosaccharide composition analyses, we have identified at least one difference between the D and E forms as an additional single O-linked N-acetyl galactosamine on an amino terminal threonine residue in Protein E. This post-translational modification appears to account for the unique 'E' epitope bound by monoclonal antibody 4E9 developed in our laboratory, and may also lead to differential processing and localization of Protein E on sperm, when compared to Protein D. These findings are the first step in distinguishing the molecular basis of the biological activities of the D and E forms of rat Crisp-1. The epididymal-specific expression of Crisp-1, combined with its role in regulation of sperm capacitation and oocyte interaction, make it an attractive target for post-testicular contraceptive development.


Asunto(s)
Anticonceptivos Masculinos , Epidídimo/metabolismo , Glicoproteínas de Membrana/metabolismo , Capacitación Espermática , Espermatozoides/fisiología , Animales , Anticoncepción/métodos , Anticonceptivos Masculinos/farmacología , Masculino , Glicoproteínas de Membrana/antagonistas & inhibidores , Glicoproteínas de Membrana/genética , Ratas , Capacitación Espermática/efectos de los fármacos , Capacitación Espermática/genética , Interacciones Espermatozoide-Óvulo/efectos de los fármacos , Interacciones Espermatozoide-Óvulo/genética , Espermatozoides/metabolismo
14.
Cancer Lett ; 227(1): 75-81, 2005 Sep 08.
Artículo en Inglés | MEDLINE | ID: mdl-16051033

RESUMEN

To investigate the role of aberrant epigenetic events in ependymoma and identify critical genes in its pathogenesis, the methylation status of nine tumour suppressor genes (TSGs: p14(ARF), p15(INK4B), p16(INK4A), CASP8, MGMT, TIMP3, TP73, RB1 and RASSF1A) was assessed. Extensive hypermethylation across the RASSF1A CpG island was detected frequently in ependymomas of all clinical and pathological disease subtypes (86% of cases, n=35), but not in non-neoplastic brain tissues (n=6). Less frequent methylation was observed for CASP8, MGMT and TP73 (5-20%). The remaining TSGs showed no evidence of methylation. RASSF1A hypermethylation represents the most common gene-specific defect identified in ependymoma highlighting the importance of its further investigation in this disease.


Asunto(s)
Ependimoma/genética , Genes Supresores de Tumor , Proteínas Supresoras de Tumor/genética , Adolescente , Adulto , Niño , Preescolar , Islas de CpG , Metilación de ADN , Epigénesis Genética , Femenino , Humanos , Masculino
15.
Biol Reprod ; 69(2): 572-81, 2003 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-12700197

RESUMEN

Ejaculated sperm are unable to fertilize an egg until they undergo capacitation. Capacitation results in the acquisition of hyperactivated motility, changes in the properties of the plasma membrane, including changes in proteins and glycoproteins, and acquisition of the ability to undergo the acrosome reaction. In all mammalian species examined, capacitation requires removal of cholesterol from the plasma membrane and the presence of extracellular Ca2+ and HCO3-. We designed experiments to elucidate the conditions required for in vitro capacitation of rat spermatozoa and the effects of Crisp-1, an epididymal secretory protein, on capacitation. Protein tyrosine phosphorylation, a hallmark of capacitation in sperm of other species, occurs during 5 h of in vitro incubation, and this phosphorylation is dependent upon HCO3-, Ca2+, and the removal of cholesterol from the membrane. Crisp-1, which is added to the sperm surface in the epididymis in vivo, is lost during capacitation, and addition of exogenous Crisp-1 to the incubation medium inhibits tyrosine phosphorylation in a dose-dependent manner, thus inhibiting capacitation and ultimately the acrosome reaction. Inhibition of capacitation by Crisp-1 occurs upstream of the production of cAMP by the sperm.


Asunto(s)
Epidídimo/fisiología , Glicoproteínas de Membrana/farmacología , Transducción de Señal/fisiología , Capacitación Espermática/fisiología , Espermatozoides/fisiología , Tirosina/fisiología , Reacción Acrosómica/fisiología , Animales , Bicarbonatos/metabolismo , Western Blotting , Calcio/fisiología , Colesterol/metabolismo , Colesterol/fisiología , Medios de Cultivo , AMP Cíclico/fisiología , Relación Dosis-Respuesta a Droga , Electroforesis en Gel de Poliacrilamida , Epidídimo/efectos de los fármacos , Inmunohistoquímica , Técnicas In Vitro , Cinética , Masculino , Fosforilación , Ratas , Ratas Sprague-Dawley , Transducción de Señal/efectos de los fármacos , Capacitación Espermática/efectos de los fármacos , Espermatozoides/efectos de los fármacos , Esfingolípidos/metabolismo
16.
Biol Reprod ; 67(2): 525-33, 2002 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-12135891

RESUMEN

The mammalian epididymis secretes numerous proteins important for sperm maturation. Among these are proteins D and E, which belong to the CRISP family (cysteine-rich secretory proteins) and are the product of the Crisp-1 gene. These proteins have been the focus of a number of studies and have been implicated in sperm/egg fusion. Protein D and protein E have been purified to apparent homogeneity in several laboratories. Polyclonal antibodies raised against each protein typically cross-reacted with both proteins, suggesting that they were immunologically similar, if not identical. Our laboratory has previously reported the generation of a monoclonal antibody (mAb 4E9) that recognizes only protein E. Using mAb 4E9, the localization of protein E was shown to be domain specific on the sperm surface and there is processing of the protein in the fluid, with only the lowest molecular weight form associating with sperm. Subsequent purification and amino acid sequencing of protein D confirmed that proteins D and E are nearly identical and differ only by presence of the 4E9 epitope on protein E. Here we report the generation of antibodies to regions of amino acid sequence identity in proteins D and E. Using these antibodies, we demonstrate that protein D associates with the sperm head and that a portion of this protein may be proteolytically processed. In addition, we demonstrate that the proteolytic processing of protein E occurs in the carboxy terminal region of this protein. The data also suggest that a portion of protein D may also undergo processing, similar to that of protein E. Finally, we use these antibodies to demonstrate that proteins D and E are differentially expressed by the epididymal epithelium. Taken together, these data suggest that proteins D and E may have individual roles in sperm function.


Asunto(s)
Epidídimo/metabolismo , Glicoproteínas/biosíntesis , Glicoproteínas/genética , Glicoproteínas de Membrana/biosíntesis , Glicoproteínas de Membrana/genética , Proteínas de Plasma Seminal/biosíntesis , Proteínas de Plasma Seminal/genética , Espermatozoides/metabolismo , Animales , Anticuerpos Monoclonales , Western Blotting , Líquidos Corporales/metabolismo , Ensayo de Inmunoadsorción Enzimática , Epítopos/genética , Regulación de la Expresión Génica/genética , Inmunohistoquímica , Masculino , Membranas/metabolismo , Microscopía Confocal , Biblioteca de Péptidos , Ratas , Ratas Sprague-Dawley
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