Sample records for hemolysins
from WorldWideScience.org

Sample records 1 - 5 shown.



2

Freqüência de hemolisinas anti-A e anti-B em doadores de sangue do Hemocentro de Botucatu/ Anti-A and anti-B hemolysin frequencies in blood donors from the Hemotherapy Center of Unesp, Botucatu

Gambero, Sheley; Secco, Valéria N. D. P.; Ferreira, Rosana R.; Deffune, Elenice; Machado, Paulo E. A.
2004-03-01

Resumo em português O Sistema ABO foi descoberto em 1900 e permanece até hoje como sendo o sistema mais importante dentro da prática transfusional. A transfusão ABO incorreta pode resultar na morte do paciente, com uma reação hemolítica intravascular, seguida de alterações imunológicas e bioquímicas. Os anticorpos ABO estão presentes nos soros dos indivíduos, dirigidos contra os antígenos A e/ou B ausentes nas hemácias. Embora as transfusões com pequenas quantias de plasmas in (mais) compatíveis sejam geralmente consideradas uma prática segura, alguns casos de reações hemolíticas por plasma incompatível são encontrados na literatura. Tendo em vista a pequena quantidade de estudos sobre as hemolisinas anti-A e anti-B e a importância desses anticorpos na prática transfusional, objetivamos neste trabalho verificar a freqüência dessas hemolisinas em doadores de sangue do Hemocentro da Unesp de Botucatu. Foram analisadas 600 amostras de soros de doadores do grupo "O" para presença ou ausência das hemolisinas anti-A e anti-B. Desses doadores, 77 (12,8%) foram classificados como perigosos por apresentarem em seu soro altos títulos de hemolisinas e 523 (87,2%) como não perigosos por apresentarem baixos títulos. No grupo dos doadores perigosos, 45 (58,4%) foram reativos para hemolisina anti-A, 11 (14,2%) reativos para hemolisina anti-B e 21 (27,2%) reativos para ambas. O título de aglutininas superior a 1/100 já considera o doador "O" como perigoso. Assim, o teste realizado em nossa rotina é suficiente para detecção de altos títulos fazendo com que os pacientes dos outros grupos sangüíneos não corram o risco de reação transfusional se necessitarem de transfusão sangüínea não-isogrupo. Resumo em inglês The ABO system was discovered in 1990 and remains until today the most important system in transfusional practice. The wrong ABO transfusion can result in death of the patient after a hemolytic reaction followed by immunological and biochemical changes. ABO antibodies are found in the serum of individuals, and are directed against the A and B antigens absent in the red cells. Although transfusions with low quantities of incompatible plasma are generally considered a safe (mais) practice, some cases of hemolytic reactions owing to incompatible plasma are described in the literature. Despite the lack of information about anti-A and anti-B hemolysins and the importance of this antibody in transfusional practice, we proposed in this work to investigate the frequencies of these hemolysins in blood donors from de Hemotherapy Center of Unesp Botucatu. Six hundred samples of blood sera from voluntary donors of the "O" blood group were analyzed to test for the presence or absence of anti-A and anti-B hemolysins. A total of 77 (12.8%) of the donors were classified as high-risk donors with the presence of high serum levels of hemolysins and 523 (87.2%) were classified as safe, presenting with low levels of hemolysins. In the group of high-risk donors, 45 (58.4%) reacted with anti-A hemolysin, 11 (14.2%) reacted with anti-B hemolysin and 21 (27.2%) reacted with both of the hemolysins. Donors with a hemolysin level of over 1/100 were considered as high-risk "O" donors. The tests performed in our daily routine is enough to detect high levels thereby avoiding the risk of other blood group patients having transfusional reactions when there is a need of receiving blood transfusions from other blood group donors.

Scientific Electronic Library Online (Portuguese)

3

Freqüência de hemolisinas anti-A e anti-B em doadores de sangue de Itapeva e Ourinhos/ Anti-A and anti-B hemolysin frequencies in blood donors from Itapeva and Ourinhos

Fernandes, Vanessa C.; Borgatto, Adriano F.; Barberato Filho, Silvio; Toledo, Maria Inês de; Lopes, Luciane C.
2008-12-01

Resumo em português Uma transfusão de sangue com o tipo ABO incorreto pode resultar na morte do paciente, com reação hemolítica intravascular, seguida de alterações imunológicas e bioquímicas. Considerando a pequena quantidade de estudos sobre as hemolisinas anti-A e anti-B e a importância desses anticorpos na prática transfusional, o objetivo deste trabalho foi verificar a frequência dessas hemolisinas e a associação a fatores como etnia e gênero em doadores de sangue dos banc (mais) os de sangue dos municípios de Itapeva e de Ourinhos, no interior do estado de São Paulo. Foram analisadas todas as amostras de doadores tipo O cadastradas nos bancos de sangue, com elevado nível plasmático de hemolisinas (doadores considerados perigosos). Coletaram-se os dados relativos à frequência das hemolisinas, etnia, gênero e procedência destes doadores. A frequência de doadores de sangue do grupo sanguíneo O perigosos é de 1,2% em Itapeva e de 5,3% em Ourinhos. Na cidade de Ourinhos, o risco de um doador branco ter hemolisina positiva é 2,16 vezes maior do que para outros doadores, e na cidade de Itapeva notou-se que o risco é menor para brancos do que para outros doadores. Em relação ao gênero, em Ourinhos o risco de um doador ter hemolisina positiva é 1,82 vezes maior para o gênero masculino, e na cidade de Itapeva, o risco foi maior para doadores do gênero feminino. A relação entre o gênero, a etnia e a frequência de hemolisinas foi diferente nas duas cidades. Mesmo assim, destaca-se a importância dos bancos de sangue estarem atentos às características de prevalência deste tipo de doador. Resumo em inglês Blood transfusion using unmatched ABO blood types can result in patient death due to intravascular hemolytic reactions followed by immunological and biochemical changes. Considering the small number of studies on anti-A and anti-B hemolysins and the relevance of these antibodies in the transfusional practice, this work aimed at assessing the frequency of these hemolysins and their relationship to factors such as ethnic background and gender in blood donors of blood banks (mais) located in Itapeva and Ourinhos, São Paulo State, Brazil. All samples from type O donors recorded in these two blood banks with high serum levels of hemolysins (donations considered high-risk) were analyzed. Data related to hemolysin frequencies, ethnicity, gender and origin of blood donors were collected. The frequency of donors belonging to the high-risk O blood group was 1.2% in Itapeva and 5.3% in Ourinhos. In Ourinhos the risk of a Caucasian donor being positive for hemolysin is 2.16 times higher than other ethnic groups and in Itapeva, it was observed that the risk is lower for Caucasians than other ethnic groups. Regarding the gender, in Ourinhos the risk of a donor being positive to hemolysin is 1.82 times greater in men and in Itapeva the risk is higher in women. The ratios of gender and ethnic background in respect to frequency were different between the two regions. Thus it is important for blood banks to be aware of regional variations.

Scientific Electronic Library Online (Portuguese)

5

Imunidade e permeabilidade celular

Lagôa, F. da Rocha
1945-12-01

Resumo em inglês After going through the more important theories on cellular permeability, researches were undertaken with the purpose of proving the actual influence of the various degrees of cellular permeability on the phenomena of organic resistance against infections, and on the production of antibodies. Three groups of substances known to have action on cellular permeability were used; the first consisting of the following permeable substances: testos-terona, acetylcholine, and the (mais) spreading-factor of the staphyloccocus. The second group included substances which help in developing low cellular permeability: atropin, adrenalin and calcium. Finally, the third group consisted of a substance which helps to maintain normal permeability: cortin (an extract of the suprarenal cortex). In order to study the process developed by these elements with regard to organic resistance against infections, adult mice were inoculated with the following germs: K. pneumoniae, P. aeruginosa, S. enteriditis and D. pneumoniae, in the smallest possible amount capable of starting a mortal sep infection in approximately 24 hours, exception made of D. pneumonias which causes death in 48 hours. The animals were divided into groups of 10, a before taking the injections containing the germs, they were given the sub lances under observation, through their peritoneum of intramuscularly. T. animals that died were autopsied and blood was taken from their hearts an aseptic process so as not to introduce extraneous organisms. For the purpose of determining the development of antibodies (hem lysins, precipitins and aglutinins), rabbits were used, which had been prep ously immunized by a treatment consisting of 6 intravenous injections of polyvolent antigen made of sheep blood cells, fresh human serum, and of suspension of S. enteriditis. It was concluded that: Cellular permeability plays a very important part in the development infections. Permeable substances help the development of germ infections. Substances helping to develop low permeability proved not to have any influence worth mentioning. Substances helping to maintain normal permeability, such as coffin, it crease resistance against infections. The different substances used which have action on cellular permeability had no influence worth mentioning on the development of certain ant bodies (hemolysins, precipitins and aglutinins). It was admitted that the phenomena under study relative to resistance against infections are closely connected to the dynamics of the cellular elements, which circumstance is basically dependent on the permeability of Citations of cells.

Scientific Electronic Library Online (Portuguese)