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1.
Ann Burns Fire Disasters ; 33(4): 329-333, 2020 Dec 31.
Artigo em Inglês | MEDLINE | ID: mdl-33708024

RESUMO

Eyebrows have a critical functional and aesthetic role on the face. Alopecia on the eyebrows has multiple origins, including scars formed after deep burns on the head and neck region. Reconstruction of the eyebrows represents a challenge for plastic surgeons due to their particular anatomical structure and variations inside of genders. Follicular Unit Transplantation (FUT) is believed to be the gold standard for the treatment of all sorts of alopecia, including that located on the eyebrows. However, FUT is technically demanding and requires skills, extensive anatomical knowledge, and equipment. In settings where FUT is still not feasible, flaps such as the superficial temporal artery island scalp flap remain reliable options. A 32-year-old male patient presented at the National Burn and Plastic Surgery Center, Casablanca (Morocco), with right eyebrow alopecia caused by fire burn on the face. We reconstructed the alopecia using a superficial temporal artery island scalp flap. The result was excellent. The patient and the physician were both very satisfied, and the patient stated that he was more comfortable with his social relationships. Among the current procedures used for the reconstruction of eyebrow alopecia, the superficial temporal artery island flap remains a versatile solution, especially after burn injuries in male patients.


Les sourcils ont des rôles fonctionnel et esthétique majeur au niveau du visage. Les alopécies sourcilières ont de multiples causes parmi lesquelles les brûlures. La reconstruction sourcilière doit tenir compte de leur structure anatomique particulière, qui plus est différente d'un sexe à l'autre. La transplantation d'unités folliculaires (TUF) est décrite comme le traitement de référence des alopécies, parmi lesquelles celles touchant les sourcils. Cette technique demande toutefois de l'entraînement, des connaissances anatomiques approfondies et du matériel spécifique. Quand la TUF n'est pas utilisable, le lambeau temporal superficiel en îlot (LTSI) est une alternative fiable. Un homme de 32 ans a été pris en charge dans le CTB national de Casablanca (Maroc) en raison d'une alopécie sourcilière droite consécutive à une brûlure, que nous avons traitée par LTSI avec un excellent résultat. Le patient comme le chirurgien étaient très satisfaits, le premier se déclarant beaucoup plus à l'aise dans sa vie sociale. Le LTSI est une solution polyvalente, ayant sa place dans la reconstruction sourcilière après brûlure, en particulier chez les hommes.

2.
Ann Burns Fire Disasters ; 31(4): 292-297, 2018 Dec 31.
Artigo em Inglês | MEDLINE | ID: mdl-30983929

RESUMO

Burn in pregnancy represents a threat to the mother and the fetus. Burn care in pregnant women is not well codified. An aggressive treatment including oxygen supplementation, smart fluid resuscitation and early excision has been reported. Nevertheless, auto-transplantation of amnion-chorion membrane in a pregnant woman with burns has not been reported to date. We present our first case of auto-transplantation of fresh amnion-chorion membrane in a pregnant woman admitted to our department with 14% TBSA deep and superficial burns associated with inhalation injury. The chorion-amnion membrane harvested after caesarean section was used to cover the excised and autograft sites. Outcome was good and all wounds healed. The child was healthy also.


La brûlure au cours de la grossesse représente une menace pour la mère et le foetus. La prise en charge de la brûlure chez la femme enceinte n'est pas encore bien codifiée. Un traitement agressif comprenant une oxygénation, une réanimation hydro électrolytique adéquate et une excision précoce a été rapporté. Cependant, l'autotransplantation de membrane chorio-amniotique prélevée chez la femme après accouchement n'a pas encore été rapportée. Nous présentons ici notre premier cas d'auto-transplantation de membrane chorio-amniotique fraîche chez une patient enceinte admise pour une brûlure de 14% de surface cutanée, profonde et superficielle associée à des lésions d'inhalation. La membrane chorio-amniotique prélevée après accouchement par césarienne a été utilisée pour couvrir les lésions superficielles et les lésions plus profondes excisées et greffées. Les suites ont été favorables. Les lésions ont cicatrisé et le nouveau-né se portait bien.

4.
Ann Burns Fire Disasters ; 29(1): 62-65, 2016 Mar 31.
Artigo em Francês | MEDLINE | ID: mdl-27857654

RESUMO

Traumas to the hand due to high-pressure injection are relatively rare and therefore not well known to practitioners. Lesions, depending on the product injected and the injection site, can have serious aesthetic and functional sequelae. Treatment is based on surgery, antibiotic therapy and early and specific rehabilitation. We report our experience and a literature overview.

5.
Ann Burns Fire Disasters ; 29(2): 90-93, 2016 Jun 30.
Artigo em Inglês | MEDLINE | ID: mdl-28149227

RESUMO

Fungal infection is a leading cause of death in burns patients and incurs significant costs for burn units. Our aim was to determine epidemiology of these infections, and analyze risk factors in the burns intensive care unit of the National Center for Burns and Plastic Surgery at Ibn-Rochd University Hospital, Casablanca. It is a retrospective review of all patients admitted from 2011-2014 who developed cultures positive for fungal organisms. Criteria for nosocomial fungal infections were those of the Center for Disease Control in Atlanta (1988, revised 1992, 2004). Microbiological surveillance was carried out daily. Patient demographic data, % TBSA, type of infection, site(s), species and number of cultures, and risk factors for fungal infections were collected. Mean age of patients was 24.5 +/- 27.3 years; 63% were female. Mean % TBSA was 30.7 +/- 23.4%, and % FTSA was 21.7 +/- 20.1%. Injury due to flame was most common (82%), followed by scald (10%), contact (4%), electrical (3%) and chemical (1%). Incidence of nosocomial fungal infection was 10%. The fungal pathogen most frequently isolated was Candida albicans (65.7%), followed by other Candida species (18.6%). Aspergillus spp was present in 3.9% and was statistically associated with mortality (3.2%) and morbidity. In our study, risk factors for these infections were mostly degree of burn (mean TBSA = 30.7%) and prolonged broad-spectrum antibiotic therapy. These two factors were associated with a higher incidence of multiple positive cultures, and significantly increased mortality (21.6%). Amphotericin B and fluconazole were the most frequently used antifungal agents. Fungi are emerging as important nosocomial pathogens. The main clinical implications are thinking faster about fungi infections and being more careful with antibiotic prescriptions.


Les infections fongiques sont une cause majeure de mortalité chez les brûlés et en augmente significativement le coût de prise en charge. Cette étude a pour buts de déterminer l'épidémiologie et d'analyser les facteurs de risque de leur survenue dans le centre national des brûlés de l'hôpital Ibn-Roch de Casablanca. Il s'agit d'une revue rétrospective des patients hospitalisés entre 2011 et 2014 ayant eu des cultures fongiques positives. Les critères de définition d'une infection fongique nosocomiale (IFN) étaient ceux du CDC d'Atlanta de 1988, révisés en 1992 et 2004. La surveillance microbiologique était journalière. Les données démographiques, la surface atteinte, le type et le (les) sites de l'infection, l'espèce, le nombre de cultures positives on été colligés. Les facteurs de risque de survenue d'une IFN ont été analysés. L'âge était de 25,4 +/- 27,3 ans, 63% des patients étaient des femmes. La surface brûlée était de 30,7 +/- 23,4% dont 21,7 +/- 20,1% profond. Les brûlures par flammes étaient les plus fréquentes (82%), suivies des ébouillantements et des brûlures par contact. L'incidence des IFN était de 10%. Candida albicans y était l'espèce la plus largement représentée (65,7%), suivie par 18,6% de « Candida non albicans ¼. Aspergillus spp étaient retrouvés dans 3,9% des cas et clairement associés à la mortalité et la morbidité. Les facteurs de risque étaient essentiellement la surface brûlée et l'antibiothérapie à large spectre prolongée. Ils étaient associés à un plus grand nombre de cultures positives multiples et à une surmortalité (21,6%). L'amphotéricine B et le fluconazole étaient les antifongiques les plus prescrits. Les champignons devenant des agents fréquents d'infections nosocomiales, il est nécessaire d'y songer rapidement et de limiter les prescriptions d'antibiotiques.

6.
Ann Burns Fire Disasters ; 28(4): 243-246, 2015 Dec 31.
Artigo em Francês | MEDLINE | ID: mdl-27777543

RESUMO

Hand burns in children are common and may lead to debilitating sequelae. Therefore, full functional restoration of the hand is the goal of treatment. To assess the epidemiological, clinical and development aspects of the burns, we conducted a retrospective study over 4 years, from January 2011 to January 2015. It evaluated 313 children suffering from burns and treated at the National Burn and Plastic Surgery Unit of Ibn Richd Teaching Hospital in Casablanca. Most patients were aged 3-6 years (70%), with a slight male predominance. Scalds accounted for 62% of the causes of burns, flames 33% and electricity 4.5%. Chemical and contact-related burns were anecdotal (1 case of each). Seventy-two per cent of the patients had partial thickness burns, which healed spontaneously. Awareness of and education on these accidents should be part of the school curriculum in order to reduce the incidence of burns in childhood.

7.
Adv Exp Med Biol ; 440: 805-12, 1998.
Artigo em Inglês | MEDLINE | ID: mdl-9782362

RESUMO

The entire leader sequence of ten equine arteritis virus (EAV) isolates including the Bucyrus reference strain was determined and analyzed at the primary nucleotide and secondary structure levels. The leader sequence of eight EAV isolates was determined to be 206 nucleotides (nt) in length, whereas those of the 86AB-A1 and 86NY-A1 isolates were found to be 205 and 207 nt in length, respectively. The sequence identity of the leader sequences between the different isolates and the Bucyrus reference strain ranged from 94.2 to 98.5%. An AUG start codon found at position 14 in all EAV isolates could initiate an open reading frame (ORF) that could produce a polypeptide of 37 amino acids, except for the 86NY-A1 isolate where the intraleader polypeptide would contain 54 amino acids. Five patterns of computer-predicted RNA secondary structures were identified in the ten EAV leader regions analyzed. All EAV isolates showed three conserved stem-loops (designated A, B and C). An additional conserved stem-loop (D) was observed in six EAV isolates, including the Bucyrus reference strain. Based on the presence or absence of stem-loop D, all EAV isolates analyzed in this study could be tentatively classified into two genogroups (I and II). The significance of the intraleader ORF and the predicted secondary structures has yet to be determined.


Assuntos
Regiões 5' não Traduzidas , Equartevirus/genética , RNA Viral , Animais , Sequência de Bases , Equidae , Dados de Sequência Molecular , Homologia de Sequência do Ácido Nucleico
8.
Can J Vet Res ; 62(3): 224-30, 1998 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-9684053

RESUMO

The extreme 5' end, the entire leader sequence of the Arvac vaccine strain, and 10 equine arteritis virus (EAV) isolates, including the ATCC Bucyrus reference strain and 5 Canadian field isolates, were determined and compared at the primary nucleotide and secondary structure levels. The leader sequence of eight EAV isolates, including the Bucyrus reference strain, and the leader sequence of the Arvac vaccine strain was determined to be 206 nt in length (not including the putative 5' cap structure-associated nucleotide) whereas those of the 86AB-A1 and 86NY-A1 isolates were found to be 205 and 207 nt in length, respectively. The sequence identity of the leader sequences, between the different isolates and the Bucyrus reference strain, ranged from 94.2 to 98.5%. Phylogenetic analysis and estimation of genetic distances, based on the leader nucleic acid sequences, showed that all EAV isolates/strains are likely to represent a large phylogenetically-related group. An AUG start codon found at position 14 in all EAV isolates/strains could initiate an open reading frame (ORF) that could produce a polypeptide of 37 amino acids, except for the 86NY-A1 isolate where the intraleader polypeptide would contain 54 amino acids. Computer-predicted RNA secondary structures were identified in the 11 EAV leader regions analyzed. All EAV isolates/strains showed 3 conserved stem-loops (designated A, B and C). An additional conserved stem-loop (D) was observed in 7 EAV isolates, including the Bucyrus reference strain. The leader region distal to stem-loop D did not contain conserved sequences or stem-loop structures common to the EAV isolates/strains.


Assuntos
DNA Viral/genética , Equartevirus/genética , Conformação de Ácido Nucleico , RNA Mensageiro/genética , Animais , Sequência de Bases , Calorimetria , Canadá , Sequência Conservada , DNA Viral/química , Equartevirus/classificação , Equartevirus/isolamento & purificação , Europa (Continente) , Cavalos , Dados de Sequência Molecular , Fases de Leitura Aberta , Filogenia , Reação em Cadeia da Polimerase , RNA Mensageiro/química , Alinhamento de Sequência , Homologia de Sequência do Ácido Nucleico , Estados Unidos , Vacinas Virais
9.
Prog Urol ; 4(3): 384-90, 1994 Jun.
Artigo em Francês | MEDLINE | ID: mdl-8044181

RESUMO

This paper presents the results of a series of 10 continent urinary valves performed in the urology department of Ibnou-Rochd hospital in Casablanca according to an original technique between 1991 and 1993. These 10 patients (6 men and 4 women) suffered from various diseases of the lower urinary tract: 4 bladder tumrous, 3 complex vesicovaginal fistulae, two of which were associated with a rectovaginal fistula, one bladder exstrophy, one neurogenic bladder and one extensive urethral stricture. The authors describe the surgical technique and the postoperative course. A detubularized ileal graft was used to create a monoblock valve-reservoir. An effective antireflux system protects the upper urinary tract and continence is ensured by a robust hydraulic valve whose flexibility and patency allow very easy self-catheterization. The physical and urodynamic characteristics of this new diversion make it a solid, perfectly continent solution providing undeniable comfort for the patient. Although based on a limited series, these results illustrate the advantages of this new continent detubularized ileal graft diversion.


Assuntos
Coletores de Urina/métodos , Adolescente , Adulto , Idoso , Extrofia Vesical/cirurgia , Feminino , Seguimentos , Humanos , Íleo/transplante , Masculino , Pessoa de Meia-Idade , Fístula Retovaginal/cirurgia , Estreitamento Uretral/cirurgia , Neoplasias da Bexiga Urinária/cirurgia , Bexiga Urinaria Neurogênica/cirurgia , Cateterismo Urinário , Coletores de Urina/efeitos adversos , Micção/fisiologia , Urodinâmica/fisiologia , Fístula Vesicovaginal/cirurgia
10.
Ann Burns Fire Disasters ; 24(3): 149-56, 2011 Sep 30.
Artigo em Francês | MEDLINE | ID: mdl-22396675

RESUMO

Post-burn cervical contractures are the consequence of deep burns, which are often neglected or badly managed. They affect the patients' general functioning, aesthetic appearance, and psychological state of mind, and treatment can be difficult. We conducted a retrospective study that lasted six years (January 2002-January 2008), analysing epidemiological and clinical features as well as the indications and therapeutic results of 49 patients presenting post-burn cervical contractures treated at the Moroccan National Burns Centre and in our surgery department. Children and young adults were the most affected, with a slight female predominance (59.2%). Domestic burns were the most frequent (93.9%) and thermal burns were the most prevalent aetiology of the accidents (98.0%). Facial burns sequelae were most frequently associated with cervical contractures (67.3% of cases), followed by trunk sequelae (46.9%). Moderate and severe cervical contractures (Achauer classification) were the most frequent, representing respectively 30.6% and 38.8% of the cases. Surgical treatment was based on skin graft (67.3% of cases), local plasties (24.5%), and flaps (8.2%). Among the 47 long-term patients studied, the functional and aesthetic results were considered good in 83.0% of cases and medium in 8.5%; repeat surgery was required in the remaining cases (8.5%). Epidemiologically (patients' age, sex, burn characteristics) and clinically (localization of sequelae, clinical forms), the results of our series are consistent with those in the literature. The importance of initial management (early excision-graft, pressotherapy, and immobilization by neck splint) in reducing the incidence and the severity of cervical burns sequelae is demonstrated. When surgical treatment is indicated, the choice of repair process essentially depends on the extent of the sequelae. Plasties (Z, IC, Y-V…) and local flaps, with or without expansion, are the classic indication in minor contractures. In severe and major contractures, opinion is divided on the choice between skin grafts and flaps. However, whatever surgical treatment is decided upon, rehabilitation is necessary for a final satisfactory result.

11.
Ann Burns Fire Disasters ; 24(4): 171-4, 2011 Dec 31.
Artigo em Francês | MEDLINE | ID: mdl-22639559

RESUMO

This retrospective study was performed in order to analyse the epidemiology and aetiology of 543 cases of paediatric burns and to determine the elements that might have contributed to their prevention, which remains the treatment of choice for this pathology. The paediatric hospitalization rate for burns was 45.7% (mean age, 4.25 yr), the highest proportion of patients (42.5%) being in the 1-5 yr age group. The male/female ratio in all age groups was 1.7/1. The environment where burn injury most commonly occurred was the home (85.1%), and with accidental causes, accounting for 96.5% of the causes (mainly liquids, 69.3%). The mean percentage of burned body surface area was 21% with a total burned body surface area of ≥ 20% in 52.3% of cases. The upper limbs (79.1%) were the most affected body site; and the children were referred from other hospitals in more than 6 h in 65.5% of cases. The mortality rate was 13.2%

12.
Ann Burns Fire Disasters ; 22(4): 185-8, 2009 Dec 31.
Artigo em Francês | MEDLINE | ID: mdl-21991179

RESUMO

Flame deriving from paint thinner is not a rare cause of burns in Morocco and we thus considered it useful to conduct an epidemiological survey of paint thinner flame burns (PTFB) in the National Burns Centre (NBC) in the Ibn-Rochd University Hospital Centre in Casablanca, Morocco. The research covered the 10-month period from September 2007 to June 2008.The aim of our work was to present the characteristic features of such burns in order to prevent them by increasing public knowledge regarding the risks involved in using paint thinner, i.e. burns in particular. During the period in question, we colligated 17 cases of PTFB out of a total number of 356 patients admitted to the NBC for acute burns of all aetiologies. The patients' average was 32 yr and they were nearly all male (16 men/1 woman), with past histories of drug addiction and/or delinquency. They were all of low-level socioeconomic class and lived mainly in shanty towns. The burn was often secondary to street violence (92% of the cases).The mean burn surface area was 23% and the burns were often deep and located mainly in the upper limbs and the trunk.

13.
Ann Burns Fire Disasters ; 22(3): 155-9, 2009 Sep 30.
Artigo em Francês | MEDLINE | ID: mdl-21991173

RESUMO

Burns sequelae in the hand are frequent and various, ranging from the aesthetic and functional to the simple and complex. We report our experience of five years of burns sequelae treatment at the National Burns and Plastic Surgery Centre in the University Hospital Centre in Casablanca, Morocco. Our survey concerned 65 patients aged 2 to 70 years (45 men and 20 women) on whom we performed a total number of 143 surgical operations in 105 hands. The sequelae were located in the back of the hand in 57 cases, followed by the commissures in 43 cases. Various reconstruction methods were used, notably skin graft (58 cases) and local flaps (32 cases). We assessed the patients' level of satisfaction with the results achieved using the different methods and found that, with regard to skin graft, 94% were satisfied with the results achieved in the back of the hand, 90% with the local flaps in the first commissure, and 95% with distance flaps. With regard to reconstruction of the thumb, 100% of the patients treated with pollicization of a finger declared their satisfaction and 75% of those treated with transfer of the second toe.

14.
Ann Burns Fire Disasters ; 18(3): 127-9, 2005 Sep 30.
Artigo em Francês | MEDLINE | ID: mdl-21990993

RESUMO

Aussi loin que l'on remonte dans la littérature, on retrouve des récits relatant des accidents consécutifs à la fulguration chez l'homme. La foudre était alors associée à la colère des dieux ou à la notion de châtiment. La fulguration correspond à un transfert d'énergie entre un cumulonimbus de charge négative et un objet de charge positive se trouvant au niveau du sol. Les lésions déterminées sont à la fois thermiques et électrothermiques. Bien que l'arrêt cardiorespiratoire soit une cause bien documentée de décès, la plupart des cas rapportés dans la littérature décrivent un éventail très disparate des séquelles qui surviennent suite à cet accident. Les Auteurs rapportent le cas d'un patient atteint par la foudre en insistant particulièrement sur les complications neurologiques qui sont survenues en cours d'évolution. Se basant sur cette observation et sur une revue de la littérature, les Auteurs soulignent que le pronostic des patients atteints par la foudre est plus favorable que généralement rapporté.

15.
Artigo em Francês | MEDLINE | ID: mdl-7653986

RESUMO

The authors report a case of Crohn's disease of the esophagus, stomach, small intestine, colon and rectum in a 34-year-old patient. The esophagus was affected three months after diagnosis of the ileo-rectal lesion. They discuss clinical and therapeutic aspects of the condition. They stress the value of upper endoscopy with multiple biopsies in providing the diagnosis. Treatment is essentially medical, surgery being restricted to fistulas after failure of medical treatment and parenteral nutrition, and to severe stenoses after failure of endoscopic dilatation.


Assuntos
Doença de Crohn/patologia , Doenças do Esôfago/patologia , Adulto , Biópsia , Doenças do Colo/patologia , Terapia Combinada , Esofagoscopia , Humanos , Doenças do Íleo/patologia , Masculino , Doenças Retais/patologia , Gastropatias/patologia
16.
Ann Chir Plast Esthet ; 47(3): 214-8, 2002 Jun.
Artigo em Francês | MEDLINE | ID: mdl-12148228

RESUMO

Through a study of 30 clinical cases, collected at the service center of plastic surgery and burns in Averroes University hospital at Casablanca, the authors underline the interest of using preputial skin as full-thickness skin graft for the treatment of burns and their sequelaes in non-circumcised boys, whose age ranged from one to four years. At this age, they are more exposed to domestic accidents. The preputial skin graft gives the advantage of the absence of scare prejudice at the donor site each time the circumcision is possible; and provides a skin of good elastic quality avoiding secondary retraction with a very favorable rate of graft intake. Although the application of this technique for other affections is possible, but remains limited by the hyperpigmentation of the graft.


Assuntos
Queimaduras/cirurgia , Circuncisão Masculina , Pênis/cirurgia , Transplante de Pele/métodos , Queimaduras/complicações , Criança , Traumatismos dos Dedos/etiologia , Traumatismos dos Dedos/cirurgia , Traumatismos do Pé/etiologia , Traumatismos do Pé/cirurgia , Humanos , Masculino , Fatores de Tempo
17.
J Biol Chem ; 270(40): 23250-3, 1995 Oct 06.
Artigo em Inglês | MEDLINE | ID: mdl-7559476

RESUMO

The P137L mutation in the adenovirus type 2 protease results in a temperature-sensitive protein-trafficking phenotype expressed during infection but not in vitro. Homology-derived secondary structure prediction placed the mutation within an externally disposed loop. Circular dichroism and urea gradient gel electrophoresis suggested that, unlike other thiol proteases, the Ad2 protease is comprised of a single conformational domain. The -0.32-kcal difference in the free energy of folding and the temperature-independent CD spectra of the mutant and wild type enzymes point to a very subtle structural change as the cause of the in vivo phenotype.


Assuntos
Adenovírus Humanos/enzimologia , Adenovírus Humanos/genética , Endopeptidases/química , Endopeptidases/genética , Mutação Puntual , Sequência de Aminoácidos , Dicroísmo Circular , Eletroforese , Estabilidade Enzimática , Dados de Sequência Molecular , Estrutura Molecular , Fenótipo , Estrutura Secundária de Proteína
18.
J Gen Virol ; 77 ( Pt 9): 2201-7, 1996 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-8811020

RESUMO

The cysteine protease encoded by adenovirus type 2 contains eight cysteines, some of which are involved in catalysis and enzyme activation. Here we investigated the effects of oxidation, mercapto-ethanol, dithiothreitol, diamide and protein disulphide isomerase on wild-type and mutant enzymes. Three isoforms of the enzyme were detected in infected cells and a fourth in preparations of purified recombinant enzyme. The latter isoform was absent in preparations of enzyme mutated at any of the three conserved cysteines, C-104, C-122 and C-126. Enzyme activity could be stimulated by agents other than the authentic activating peptide (pVIc), such as cysteamine, though less efficiently. Diamide at low concentrations stimulated the activity of the ts1 enzyme, but inhibited both ts1 and wild-type enzyme at higher concentrations. Protein disulphide isomerase failed to restore enzyme activity to the oxidized isoform. The present studies in combination with previous results using mutants appeared to rule out amino acids C-67, C-122, C-126 and C-127, leaving the two remaining semi-conserved C-17 and C-40 and the conserved C-104 as potential candidates for binding peptide pVIc.


Assuntos
Adenovírus Humanos/enzimologia , Cisteína Endopeptidases/metabolismo , Isoenzimas/metabolismo , Cisteína Endopeptidases/efeitos dos fármacos , Diaminas/farmacologia , Dissulfetos , Humanos , Isoenzimas/efeitos dos fármacos , Oxidantes/farmacologia , Oxirredução
19.
J Biol Chem ; 271(51): 32511-4, 1996 Dec 20.
Artigo em Inglês | MEDLINE | ID: mdl-8955073

RESUMO

The adenovirus protease cleaves consensus sequences (M/I/L)XGX-G and (M/I/L)XGG-X. Using purified recombinant protease, we showed that a peptide bearing the GX-G site was hydrolyzed more rapidly than a peptide bearing the GG-X site. The GX-G site was also preferentially cleaved on viral protein pVI which bears both sites of cleavage. Evidence is presented that suggests a biological role for this differential cleavage efficiency.


Assuntos
Adenovírus Humanos/enzimologia , Cisteína Endopeptidases/metabolismo , Endopeptidases/metabolismo , Sequência de Aminoácidos , Capsídeo/metabolismo , Sequência Consenso , Precursores de Proteínas/metabolismo , Especificidade por Substrato
20.
Virology ; 191(1): 187-92, 1992 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-1413500

RESUMO

We have previously described a revertant cell line which expresses a dominant tumor suppressor phenotype to E1 but not to heterologous oncogenes such as c-myc, N-ras, or polyoma middle t (Sircar et al. (1988) Oncogene 3, 725-728). DNA tumor virus oncogenes have been suggested to transform cells via the common mechanism of sequestering the Rb-105 antioncoprotein. This paradigm would predict that our revertant cell line, which is resistant to retransformation by E1a, should also be resistant to the other members of the Rb-105 binding family of oncogenes. To test this hypothesis we transfected the revertant cell line with plasmids bearing SV40-T or the HPV16-E7 oncogenes. Because transformation was obtained by both oncogenes at efficiencies similar to the transformation of a related revertant cell line, the results suggest that the resistance phenotype is specific to E1a. This specificity was further confirmed by cell fusion experiments.


Assuntos
Adenoviridae/genética , Proteínas E1A de Adenovirus/fisiologia , Antígenos Transformantes de Poliomavirus/fisiologia , Transformação Celular Viral , Proteínas Oncogênicas Virais/fisiologia , Oncogenes , Adenoviridae/fisiologia , Proteínas E1A de Adenovirus/genética , Animais , Antígenos Transformantes de Poliomavirus/genética , Linhagem Celular , Genes Supressores , Camundongos , Proteínas Oncogênicas Virais/genética , Proteínas E7 de Papillomavirus , Ratos , Especificidade da Espécie
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