Functional changes of dendritic cells in hypersensivity reactions to amoxicillin

A better understanding of dendritic cell (DC) involvement in responses to haptenic drugs is needed, because it represents a possible approach to the development of an in vitro test, which could identify patients prone to drug allergies. There are two main DC subsets: plasmacytoid DC (pDC) and myeloid DC (mDC). β-lactams form hapten-carrier conjugates and may provide a suitable model to study DC behavior in drug allergy reactions. It has been demonstrated that drugs interact differently with DC in drug allergic and non-allergic patients, but there are no studies regarding these subsets. Our aim was to assess the functional changes of mDC and pDC harvested from an amoxicillin-hypersensitive 32-year-old woman who experienced a severe maculopapular exanthema as reflected in interleukin-6 (IL-6) production after stimulation with this drug and penicillin. We also aim to demonstrate, for the first time, the feasibility of this method for dendritic cell isolation followed by in vitro stimulation for studies of drug allergy physiopathology. DC were harvested using a double Percoll density gradient, which generates a basophil-depleted cell (BDC) suspension. Further, pDC were isolated by blood DC antigen 4-positive magnetic selection and gravity filtration through magnetized columns. After stimulation with amoxicillin, penicillin and positive and negative controls, IL-6 production was measured by ELISA. A positive dose-response curve for IL-6 after stimulation with amoxicillin and penicillin was observed for pDC, but not for mDC or BDC suspension. These preliminary results demonstrate the feasibility of this methodology to expand the knowledge of the effect of dendritic cell activation by drug allergens.

Functional changes of dendritic cells in hypersensivity reactions to amoxicillin.

A better understanding of dendritic cell (DC) involvement in responses to haptenic drugs is needed, because it represents a possible approach to the development of an in vitro test, which could identify patients prone to drug allergies. There are two main DC subsets: plasmacytoid DC (pDC) and myeloid DC (mDC). ß-lactams form hapten-carrier conjugates and may provide a suitable model to study DC behavior in drug allergy reactions. It has been demonstrated that drugs interact differently with DC in drug allergic and non-allergic patients, but there are no studies regarding these subsets. Our aim was to assess the functional changes of mDC and pDC harvested from an amoxicillin-hypersensitive 32-year-old woman who experienced a severe maculopapular exanthema as reflected in interleukin-6 (IL-6) production after stimulation with this drug and penicillin. We also aim to demonstrate, for the first time, the feasibility of this method for dendritic cell isolation followed by in vitro stimulation for studies of drug allergy physiopathology. DC were harvested using a double Percoll density gradient, which generates a basophil-depleted cell (BDC) suspension. Further, pDC were isolated by blood DC antigen 4-positive magnetic selection and gravity filtration through magnetized columns. After stimulation with amoxicillin, penicillin and positive and negative controls, IL-6 production was measured by ELISA. A positive dose-response curve for IL-6 after stimulation with amoxicillin and penicillin was observed for pDC, but not for mDC or BDC suspension. These preliminary results demonstrate the feasibility of this methodology to expand the knowledge of the effect of dendritic cell activation by drug allergens.

Menthol-induced asthma: a case report.

A case of asthma due to menthol is reported in a 40-year-old woman with no history of asthma or any other allergy. During the last two years, the patient had presented dyspnea, wheezing and nasal symptoms when exposed to mentholated products such as toothpaste and candies. The etiology was suggested by the history of exposure and diagnosis was established by skin tests and bronchial challenge with menthol. The patient achieved control of symptoms by avoiding menthol and its derivatives.

Determination of Blomia tropicalis-specific IgE and IgG subclasses in atopic dermatitis patients.

BACKGROUND: To verify the importance of Blomia tropicalis in atopic dermatitis (AD), we determined the cutaneous reactivity and the serum level of B. tropicalis-specific IgE and IgG subclasses in AD patients. METHODS: B. tropicalis-specific IgE and IgG subclasses were determined in AD patients and compared with bronchial asthma (BA) patients and a control group (CG) of nonatopic subjects. Specific IgE was obtained by skin prick test and RAST. B. tropicalis-specific IgG subclasses were determined by ELISA. The data were statistically analyzed by chi-square test (Mantel-Haenszel) and odds ratio (OR). RESULTS: We detected positive skin prick tests in 61.76% of AD and 83.33% of BA patients, and in 12.5% of the CG. RAST was positive in 44.12% of AD and in 61.90% of BA patients, but not in the CG. B. tropicalis-specific IgG1 and IgG2 subclasses showed no significant differences between the three groups. IgG3 subclass positivity was statistically significant in AD patients (41.17%) when compared to BA patients (14.29%) and the CG (16.67%). The determination of B. tropicalis-specific IgG4 was positive in 32.35% of AD patients, 21.43% of BA patients, and 8.33% of the CG. CONCLUSIONS: These results confirm that the storage mite B. tropicalis is an important allergen in AD. It is possible that IgG3 activates the complement in AD patients, releasing vasoactive amines that further amplify the allergic reaction. The positive results of the B. tropicalis-specific IgG4 found in AD and BA were probably due to chronic exposure to this storage mite in the home environment.

[Infant morbimortality due to acute diarrhea in a metropolitan area of northeastern Brazil, 1986-1989]. / Morbimortalidade infantil por diarréia aguda em área metropolitana da região Nordeste do Brasil, 1986-1989.

Six cross-sectional studies involving children under five years of age in three places on S. Luiz island, i.e., Vila Palmeira, Anjo da Guarda and S. José de Ribamar, were performed. A standardized questionnaire on the presence of diarrhoea in the previous 2 weeks was answered by the mothers or by those responsible for the children. Two population based studies (in May 1986 and May 1989) and four sample based surveys (in November of 1986, 1987 and 1988 and in May 1989) were carried out. The prevalence of diarrhoea was highest in May, 1986 and November, 1987. The highest prevalence occurred in S. José de Ribamar. The distribution of cases according to age showed a higher prevalence among children of 6-11 months and between 1 and 2 years of age. The prevalence of diarrhoea was highest among the families: that excreted directly into the sea or a latreen; that used water from uncovered wells; that threw their garbage into the sea; and whose bread-winners were unemployed. Diarrhoea was the principal cause of death in both surveys. Infant mortality, in May 1986, was 44.0 per thousand in children under 1 year of age and 12.8 in children under 5 years old; in May 1989 it was 7.9 per thousand and 4.9 per thousand respectively. The decrease in child morbidity and mortality due to diarrhoea between 1986 and 1989 was statistically significant.

[Oral rehydration therapy for acute diarrhea in a region of northeastern Brazil, 1986-1989]. / Terapia de reidratação oral para diarréia aguda em região do nordeste do Brasil, 1986-1989.

Some aspects of the use of oral rehydration therapy (ORT) in the treatment of acute infant diarrhoea in children under five years of age in three different areas of S. Luís Island, Maranhão, Brazil were analysed. This paper is based on data from a transversal study carried out by "Projeto de Controle da Doença Diarréica Infantil no Maranhão" in the districts of Vila Palmeira and Anjo da Guarda in the municipality of S. Luís and in two other districts in S. José de Ribamar county, involving 13,867 children under five years of age, in 1986 and 1989. Chi-square analysis and Fisher's exact test were used for significance testing. The study revealed a high prevalence of diarrhoeal diseases and a low usage of ORT in the areas analysed, with a significant decrease in the former from 1986 to 1989, and a great variance from one area to another, especially in 1986. The use of ORT was closely related to the age of the children, the educational level, of their mothers, and who it was who prescribed the treatment and medicines. There was no significant association with family income or the working relationships of the head of family at his/her job. There was a lack of knowledge of anthropological aspects of the use of ORT. Some intervention activities are proposed increase the dissemination of ORT, such as a health educational policy directed mainly to low income communities a review of programs on management of infant diarrhoea directed at health workers and a training program for the health community agents to improve their job in the communities.

[Disseminated cutaneous leishmaniasis due to Leishmania viannia braziliensis in the state of Maranhão, Brazil]. / Leishmaniose cutânea disseminada produzida por Leishmania viannia braziliensis no Estado do Maranhão--Brasil.

The authors describe a case of a patient from Barreirinhas, MA with disseminated cutaneous leishmaniasis, who presented 58 lesions spread all over his body, with many different aspects, but ulcerative lesions were predominant. They discuss the difficulty of laboratory diagnosis in the beginning of the investigation and its therapeutics implications. The parasite isolated was identified as Leishmania viannia braziliensis using monoclonal antibodies in the fluorescent antibody test. This form of the disease is different from the diffuse cutaneous leishmaniasis found in Maranhão, due to Leishmania (Leishmania) amazonensis which is responsible for most of the cases of cutaneous leishmaniasis in our state. The possible mechanisms of lesions dissemination are discussed.

[The current status of diffuse cutaneous leishmaniasis (DCL) in the state of Maranhão. II. The epidemiological and clinico-evolutionary aspects]. / Estado atual da leishmaniose cutânea difusa (LCD) no Estado do Maranhão. II. Aspectos epidemiológicos, clínico-evolutivos.

The authors describe a retrospective and prospective study of 6 patients with diffuse cutaneous leishmaniasis observed in the state of Maranhão, since 1974. The patients come from different rural regions of the state and in all of them Leishmania (Leishmania) amazonensis was the cause five of the patients initiated their disease in the first decade of life. All the patients first had a solitary, nodular lesion, that after a variable period of time, disseminated and acquired other aspects. Sequentially the patients presented multiple nodular and ulcerative lesions, negative Leishmania skin tests and a refractory response to the therapeutic schedules used up to the present.

[Fonsecaea pedrosoi-caused chromoblastomycosis in the state of Maranhão. I. The clinical, epidemiological and evolutionary aspects]. / Cromoblastomicose produzida por Fonsecaea pedrosoi no Estado do Maranhão. I--Aspectos clínicos, epidemiologicos e evolutivos.

The aim of this study was to observe the clinical and of epidemiological behavior of chromoblastomycosis in the State of Maranhão. A retrospective and prospective study of 13 cases was performed at the infectious diseases section of the Hospital dos Servidores do Estado do Maranhão, from November, 1988 to July, 1991. In the investigation a protocol record was used with a view to further analysis. A higher prevalence between 50 and 60 years of age (46.1%) and in male patients (92.3%) was noted. Twelve patients (92.3%) were from Maranhão State, and 10 of them (76.9%) came from the western microregion of the State of Maranhão. Regarding occupation, 92.3% were land workers, and most of them presented the lesions on the lower limbs (84.6%) of a vegetant warty aspect, brown in color with itching. Histopathological examination diagnosed chromomycosis in 100% of the cases. Culture was performed in 11 cases, and Fonsecaea pedrosoi isolated in 9 of them. Treatment with 5-fluorocytosine resulted in a good evolutive response. This study indicates the existence of a probable endemic area of chromomycosis in hinterland of Maranhão (western microregion) that hither to unknown.