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Biomedical subjects

S Robineau

Publications and source records attributed to S Robineau.

At least 19 recordsLinked to original sources
PubMed2006

Effects of pregnancy and childbirth on the incidence of urinary disorders in multiple sclerosis.

OBJECTIVE: Women with multiple sclerosis frequently pose questions to physicians regarding the potential negative impact of pregnancy, especially on urinary disorders. About 50 to 80% of patients suffer from urinary disorders during the course of the disease. Trauma to the pelvic floor and the urethral sphincter during vaginal delivery may lead to the development of stress urinary incontinence. The purpose of this work was to study the consequences of pregnancy and childbirth on urinary problems. STUDY DESIGN: An inception cohort of 368 consecutive women suffering from multiple sclerosis (MS), according to the Poser criteria, were included in the study between June 1999 and June 2000. For each patient a full urological and obstetrical record was obtained. RESULTS: Two hundred and seventy-three women (74%) had had at least one pregnancy. The parous women were older at the time of the study (mean age: 45.5 years vs 35.5 years), and were older at MS onset (mean age: 32.8 years vs 25.7 years). The nulliparous women were more rapidly disabled, with a shorter time to reach an EDSS score of 3 from MS onset (mean time of 5.9 years versus 8.2 years in parous women). In parous women, 259 (95%) had had at least one vaginal delivery and 14 (5%) had had a caesarean only. Delivery modalities had no influence on urinary disorder frequency or the type of problems. CONCLUSION: On the basis of these data, there is actually no clear argument for systematically performing caesarean section in MS women. Urinary disorders in these women were mostly linked to the duration and the severity of the disease but not to pregnancy or delivery modalities. From our point of view, caesarean section must be decided only on classic obstetrical criteria as for healthy women independently of multiple sclerosis. However our data were open and retrospective.

Adult↗
PubMed2005

[Multiple sclerosis and physical activities].

INTRODUCTION: Multiple sclerosis (MS) is a neurological disease of the central nervous system that most often affects young people. It is characterized by various debilitating symptoms. The aim of this study was to assess physical activities in patients with MS and how these affect their quality of life. METHODS: Forty-five patients were questioned about their physical activities. The following were taken into account: the characteristics of MS within each patient, the level of disease severity (EDSS score) and the quality of life (on the SEP-59 questionnaire). RESULTS: Fifteen patients had to give up a physical activity because of their illness but more so due to ataxia, fatigue and muscular weakness. Fifteen patients take part in a physical activity, the principal motivation being for their personal well-being. The mean EDSS was 4.2. Answers on the SEP-59 revealed found that patients with MS who took part in a physical activity had significantly better well-being in general. DISCUSSION AND CONCLUSION: Physical activities seem to improve the quality of life of patients with MS who, in general, already have a poor quality of life in relation to the general population. Knowing that muscular function is improved through exercise in patients with an EDSS less than 6, it would seem advantageous for them to take part in a regular physical activity.

Adolescent↗
PubMed2005

[Home care and quality of life three years after stroke].

INTRODUCTION: Stroke is the most disabling chronic disease among adults. The assessment of quality of life is of great importance to improve the management of patients with stroke sequelae returning to the community. METHOD: A total of 93 patients and their referring clinicians were contacted. Quality of life of patients three years after stroke was assessed by use of the Short-Form Health Survey (SF-36). RESULTS: Thirteen patients died during this period. Fifty participated in the study. The average age was 66.8 years. The patients who died were older and had an initial greater impairment after stroke than survivors. In most of the cases, a life plan, built during the inpatient rehabilitation period, could be achieved. Just six patients had to change their way of life during the three years after stroke. A total of 44% of the patients needed human assistance for basic daily living activities. Patients with stroke had lower scores on the SF-36 than their healthy peers. All subscale scores differed for patients with stroke, as compared with health peers. Initial disability, the occurrence of falls, age and urinary incontinence at the time of the study indicated poor prognosis. DISCUSSION: Our results are close to those previously published: a great number of people who survive stroke live with sequelae that requires assistance in the home and have decreased quality of life. These results stress the importance of follow-up by a rehabilitation team to prevent altered quality of life, with a special care to urinary incontinence and falls, especially in old people with abundant sequelae of stroke.

Aged↗
PubMed2005

[Eccentric isokinetic strengthening in hamstrings of patients with multiple sclerosis].

OBJECTIVE: To assess the benefit of a program of rehabilitation involving eccentric isokinetic muscle strengthening for hamstrings of patient with multiple sclerosis. PATIENTS AND METHODS: A total of 28 patients with multiple sclerosis and abnormalities when walking who underwent a program of rehabilitation involving eccentric isokinetic muscle strengthening associated with classical neurological rehabilitation. Assessment was by use of an isokinetic test, clinical examination and score on a visual analog scale (VAS) about quality of walking at the beginning and end of the rehabilitation program and three months later. The rehabilitation program involved eccentric isokinetic exercises during 12 sessions. RESULTS: Patients with multiple sclerosis and difficulty walking showed weak hamstrings on manual muscular testing. After 12 sessions of isokinetic eccentric rehabilitation, hamstring and quadriceps strength increased, VAS score increased, and recurvatum of the knee improved in 26 cases. Three months later, the score for quality of walking remained the same, but that for strength returned to a previous level. CONCLUSION: Hamstring strength in patients with multiple sclerosis can be improved without complication with use of eccentric isokinetic rehabilitation. This is an interesting way to improve the quality of walking in these patients.

Adult↗
PubMed2005

Rickettsia felis, from culture to genome sequencing.

Rickettsia felis has been recently cultured in XTC2 cells. This allows production of enough bacteria to create a genomic bank and to sequence it. The chromosome of R. felis is longer than that of previously sequenced rickettsiae and it possess 2 plasmids. Microscopically, this bacterium exhibits two forms of pili: one resembles a conjugative pilus and another forms hair-like projections that may play a role in pathogenicity. R. felis also exhibits several copies of ankyrin-repeat genes and tetratricopeptide encoding gene that are specifically linked to pathogenic host-associated bacteria. It also contains toxin-antitoxin system encoding genes that are extremely rare in intracellular bacteria and may be linked to plasmid maintenance.

Animals↗
PubMed2004

[Interest of visual biofeedback training in rehabilitation of balance after stroke].

OBJECTIVE: The aim of this study was the assessment of visual biofeedback in the management of balance disorders after stroke. MATERIAL AND METHODS: This is a prospective randomised trial, which compares visual biofeedback training and traditional balance training. Twenty-seven patients took part in this study: 13 in the first group and 14 in the second group. The rehabilitation program in the first group consists in an association of visual biofeedback and traditional training during 3 weeks. For the second group traditional training was used alone. Clinical, functional and forceplate assessments were performed before and after the program of rehabilitation. RESULTS: All the patients had a clinical and functional improvement. However, patients who have benefited from biofeedback training had a significant improvement of the forceplate parameters with closed eyes. DISCUSSION AND CONCLUSION: Those results confirm the interest of rehabilitation in balance disorders after stroke. The use of biofeedback training incorporated into functional physiotherapy affords added benefits probably by a best integration of proprioceptive informations.

Adult↗
PubMed2004

[Influence of temperature changes on clinical symptoms in multiple sclerosis: an epidemiologic study].

UNLABELLED: The effects of the modifications of temperature are well known in patients affected by multiple sclerosis (MS). They are variable and can influence daily living. This sensibility can be used in the management of the disabilities. METHOD: An epidemiological study was realized on a cohort of 191 patients suffering from MS referred to the MS clinic of Rennes (France). All the patients were questioned about the influence of heat and cold on their clinical symptoms (fatigue spasticity, walking disorders, vision, em leader ). Correlations with the main clinical characteristics were studied. POPULATION: One hundred ninety-one patients, 129 women and 62 men with an average age of 47.6 +/- 10 years were interviewed. Average score EDSS was of 5.2 +/- 1.5. The mean duration of MS was 13.5 +/- 10 years. RESULTS: One hundred forty-seven patients (77%) reported a sensibility to the temperature. Heat deteriorated function in 104 cases and 82 patients improved with cold. Paradoxically 20 patients reported to be deteriorated with cold and 19 improved with heat. Fatigue and walking were the most sensitive to temperature fluctuations. No particular clinical profile could be established. Fifty percent of the patients used this sensibility with therapeutic aim in everyday life. DISCUSSION: The clear influence of temperature fluctuations on the clinical symptom was confirmed in this study. However, there is a great variability from one patient to another. Different hypotheses have been evoked to explain this phenomenon. The most likely is an influence on the nervous specific conductivity. In routine practice cold physiotherapy will be proposed on case by case basis and still has an interesting place in the rehabilitation management.

Adult↗
PubMed2001

[Musculoskeletal disorders in instrumental musicians: epidemiological study].

OBJECTIVES: To evaluate the frequency and types of musculoskeletal problems of French instrumental musicians. METHODS: Voluntary musicians answered an anonymous questionnaire about their musical practices, their medical history, and the evaluation of the troubles they feel during playing music. The musicians have been contacted in music schools, professional and not-professional orchestras. RESULTS: During this study 635 musicians received a questionnaire. 141 answered it (22.5%): 76.6% suffer from overuse syndrome, 17% from entrapment neuropathies, 5.7% from occupational hand cramp. The main topographies are spine (60.9%) and wrist and hand (52.5%). Instrumental characteristics are exposed. CONCLUSION: Instrumental musicians often present musculoskeletal problems. A specific management would be useful to limit eventual drammatical consequences.

Adolescent↗
PubMed2000

Binding site of brefeldin A at the interface between the small G protein ADP-ribosylation factor 1 (ARF1) and the nucleotide-exchange factor Sec7 domain.

Sec7 domains (Sec7d) catalyze the exchange of guanine nucleotide on ARFs. Recent studies indicated that brefeldin A (BFA) inhibits Sec7d-catalyzed nucleotide exchange on ARF1 in an uncompetitive manner by trapping an early intermediate of the reaction: a complex between GDP-bound ARF1 and Sec7d. Using (3)H-labeled BFA, we show that BFA binds to neither isolated Sec7d nor isolated ARF1-GDP, but binds to the transitory Sec7d-ARF1-GDP complex and stabilizes it. Two pairs of residues at positions 190-191 and 198-208 (Arno numbering) in Sec7d contribute equally to the stability of BFA binding, which is also sensitive to mutation of H80 in ARF1. The catalytic glutamic (E156) residue of Sec7d is not necessary for BFA binding. In contrast, BFA does not bind to the intermediate catalytic complex between nucleotide-free ARF1 and Sec7d. These results suggest that, on initial docking steps between ARF1-GDP and Sec7d, BFA inserts like a wedge between the switch II region of ARF1-GDP and a surface encompassing residues 190-208, at the border of the characteristic hydrophobic groove of Sec7d. Bound BFA would prevent the switch regions of ARF1-GDP from reorganizing and forming tighter contacts with Sec7d and thereby would maintain the bound GDP of ARF1 at a distance from the catalytic glutamic finger of Sec7d.

ADP-Ribosylation Factor 1↗
PubMed1999

Sensory-motor and genito-sphincter dysfunctions in multiple sclerosis.

Multiple sclerosis is a chronic demyeliniting disease of the central nervous system which is characterized by an extreme multiplicity of clinical features. Multiple sclerosis can have a profound impact on the quality of life of patients. The induced handicap varies from one patient to an other, and depends on the location of the demyeliniting lesions. Among the symptoms, sensory-motor disorders and genito-sphincter dysfunctions are some of the more disabling. Thus, up to 70% of patients suffer from urinary troubles, and 15 years after the onset of the illness, 50% of patients have difficulties for deambulation. A good knowledge of these pathologies is necessary to improve the management of patients suffering from multiple sclerosis.

Female Urogenital Diseases↗
PubMed1999

Brefeldin A acts to stabilize an abortive ARF-GDP-Sec7 domain protein complex: involvement of specific residues of the Sec7 domain.

We demonstrate that the major in vivo targets of brefeldin A (BFA) in the secretory pathway of budding yeast are the three members of the Sec7 domain family of ARF exchange factors: Gea1p and Gea2p (functionally interchangeable) and Sec7p. Specific residues within the Sec7 domain are important for BFA inhibition of ARF exchange activity, since mutations in these residues of Gea1p (sensitive to BFA) and of ARNO (resistant to BFA) reverse the sensitivity of each to BFA in vivo and in vitro. We show that the target of BFA inhibition of ARF exchange activity is an ARF-GDP-Sec7 domain protein complex, and that BFA acts to stabilize this complex to a greater extent for a BFA-sensitive Sec7 domain than for a resistant one.

ADP-Ribosylation Factors↗
PubMed1998

ARNO3, a Sec7-domain guanine nucleotide exchange factor for ADP ribosylation factor 1, is involved in the control of Golgi structure and function.

Budding of transport vesicles in the Golgi apparatus requires the recruitment of coat proteins and is regulated by ADP ribosylation factor (ARF) 1. ARF1 activation is promoted by guanine nucleotide exchange factors (GEFs), which catalyze the transition to GTP-bound ARF1. We recently have identified a human protein, ARNO (ARF nucleotide-binding-site opener), as an ARF1-GEF that shares a conserved domain with the yeast Sec7 protein. We now describe a human Sec7 domain-containing GEF referred to as ARNO3. ARNO and ARNO3, as well as a third GEF called cytohesin-1, form a family of highly related proteins with identical structural organization that consists of a central Sec7 domain and a carboxy-terminal pleckstrin homology domain. We show that all three proteins act as ARF1 GEF in vitro, whereas they have no effect on ARF6, an ARF protein implicated in the early endocytic pathway. Substrate specificity of ARNO-like GEFs for ARF1 depends solely on the Sec7 domain. Overexpression of ARNO3 in mammalian cells results in (i) fragmentation of the Golgi apparatus, (ii) redistribution of Golgi resident proteins as well as the coat component beta-COP, and (iii) inhibition of SEAP transport (secreted form of alkaline phosphatase). In contrast, the distribution of endocytic markers is not affected. This study indicates that Sec7 domain-containing GEFs control intracellular membrane compartment structure and function through the regulation of specific ARF proteins in mammalian cells.

ADP-Ribosylation Factor 1↗
PubMed1998

A glutamic finger in the guanine nucleotide exchange factor ARNO displaces Mg2+ and the beta-phosphate to destabilize GDP on ARF1.

The Sec7 domain of the guanine nucleotide exchange factor ARNO (ARNO-Sec7) is responsible for the exchange activity on the small GTP-binding protein ARF1. ARNO-Sec7 forms a stable complex with the nucleotide-free form of [Delta17]ARF1, a soluble truncated form of ARF1. The crystal structure of ARNO-Sec7 has been solved recently, and a site-directed mutagenesis approach identified a hydrophobic groove and an adjacent hydrophilic loop as the ARF1-binding site. We show that Glu156 in the hydrophilic loop of ARNO-Sec7 is involved in the destabilization of Mg2+ and GDP from ARF1. The conservative mutation E156D and the charge reversal mutation E156K reduce the exchange activity of ARNO-Sec7 by several orders of magnitude. Moreover, [E156K]ARNO-Sec7 forms a complex with the Mg2+-free form of [Delta17]ARF1-GDP without inducing the release of GDP. Other mutations in ARNO-Sec7 and in [Delta17]ARF1 suggest that prominent hydrophobic residues of the switch I region of ARF1 insert into the groove of the Sec7 domain, and that Lys73 of the switch II region of ARF1 forms an ion pair with Asp183 of ARNO-Sec7.

ADP-Ribosylation Factor 1↗
PubMed1998

Structure of the Sec7 domain of the Arf exchange factor ARNO.

Small G proteins switch from a resting, GDP-bound state to an active, GTP-bound state. As spontaneous GDP release is slow, guanine-nucleotide-exchange factors (GEFs) are required to promote fast activation of small G proteins through replacement of GDP with GTP in vivo. Families of GEFs with no sequence similarity to other GEF families have now been assigned to most families of small G proteins. In the case of the small G protein Arf1, the exchange of bound GDP for GTP promotes the coating of secretory vesicles in Golgi traffic. An exchange factor for human Arf1, ARNO, and two closely related proteins, named cytohesin 1 and GPS1, have been identified. These three proteins are modular proteins with an amino-terminal coiled-coil, a central Sec7-like domain and a carboxy-terminal pleckstrin homology domain. The Sec7 domain contains the exchange-factor activity. It was first found in Sec7, a yeast protein involved in secretion, and is present in several other proteins, including the yeast exchange factors for Arf, Geal and Gea2. Here we report the crystal structure of the Sec7 domain of human ARNO at 2 A resolution and the identification of the site of interaction of ARNO with Arf.

ADP-Ribosylation Factor 1↗
PubMed1998

Molecular and biochemical analysis of Saccharomyces cerevisiae cox1 mutants.

We report on the molecular and biochemical analysis of a set of 13 respiratory deficient mutants of Saccharomyces cerevisiae which are specifically altered in COX1, the gene encoding the subunit Cox1p of cytochrome c oxidase. DNA sequence analysis shows that three are due to frameshift mutations, two to nonsense mutations, and eight to missense mutations. All, except the missense mutant S157L, have impaired electron transfer and respiratory activity. Analysis of the mitochondrial translation products shows that when Cox1p is absent, Cox2p and Cox3p are still synthesized. In the missense mutants, the steady state levels in the mitochondrial membranes of the three mitochondrially encoded subunits Cox1p, Cox2p and Cox3p and the nuclear-encoded subunit Cox4p are reduced. In the frameshift and nonsense mutants, Cox1p is absent and Cox2p, Cox3p and Cox4p are considerably decreased or undetectable. A comparison of the steady state levels of Cox1p through Cox4p in the COX1, COX2, COX3 and COX4 mutants shows the interdependance of the accumulation of these four subunits in the mitochondrial membranes.

Amino Acid Sequence↗
PubMed1998

Vesicourethral dysfunction and urodynamic findings in multiple sclerosis: a study of 149 cases.

OBJECTIVE: Vesicourethral dysfunction is common in people with multiple sclerosis and results in significant impairment. We studied the clinical and urodynamic findings in such patients to define risk factors for incontinence and upper urinary tract infections. DESIGN AND SETTING: A cohort study of 149 patients with multiple sclerosis and urinary symptoms seen in our urodynamic laboratory. INTERVENTION: A complete urodynamic study of each patient with urethrocystometry and continuous recording of the urethral sphincter electromyography and assessment of postvoid residual. RESULTS: Detrusor hyperreflexia and sphincter dyssynergia were the main dysfunctions. No significant relation between clinical features and urodynamic patterns was found. Women with low maximal urethral pressure were particularly prone to incontinence, which occurred in 69% of the patients. Pyelonephritis was associated with a postvoiding residual urine of > 30% of the functional detrusor capacity, and was found more often in the male population. CONCLUSION: Urodynamic assessment of bladder function is critical to direct therapy for urinary complaints in people with multiple sclerosis.

Adult↗