RESUMO
Objetivo: revisar os aspectos imunopatogênicos da sífilis materno-fetal. Método: uma pesquisabibliográfica foi realizada utilizando-se as palavras-chave: sífilis congênita + imunopatogenia, sífilis materna+ imunopatogenia, sífilis + interface materno-fetal. As bases de dados pesquisadas foram a Medline (MedicalLiterature Analysis and Retrieval System Online) da National Library of Medicine (EUA) e a LILACS(Literatura Latino-Americana e do Caribe em Ciências da Saúde). Considerações finais: a infecção peloTreponema pallidum e o desenvolvimento das características clínicas deletérias deve-se ao êxito dosmecanismos de invasão, evasão e da resposta imunológica do hospedeiro. Na gestação ocorrem mudançashormonais, imunológicas e nutricionais necessárias ao bom desenvolvimento fetal que, porém, modulam asuscetibilidade materno-fetal à infecção. Nesse contexto, o perfil de citocinas na placenta tende a proteger ofeto de ser expulso, ao inibir a resposta celular citotóxica, dificultando, no entanto, a eliminação dotreponema da interface materno-fetal. Por outro lado, a resposta imunológica do feto ainda é imatura até a10ª - 20ª semana de gestação, permitindo que o patógeno invada, dissemine e escape. Assim, o diagnósticoprecoce para instituição do tratamento no recém-nascido é mandatório para prevenção das seqüelas e, comoainda não existe um exame laboratorial disponível na rede pública que permita esse diagnóstico em tempohábil, fica claro que um maior conhecimento da fisiopatogenia da doença é prioritário no sentido decontribuir para o avanço nas pesquisas clínicas
Objective: the objective of this study was to revise the immunopathogenic aspects of maternalfetalsyphilis. Methods: a detailed literature search of the Medline (Medical Literature Analysisand Online Retrieval System) of the American National Library of Medicine and the LILACS(Latin American and Caribbean Health Sciences) databases was conducted using the key wordscongenital syphilis + immunopathogeny, maternal syphilis + immunopathogeny, and syphilis +maternal-fetal interface. Final Considerations: the success of infection by T. pallidum and thedevelopment of deleterious clinical symptoms is due to the effectiveness of the mechanisms ofinvasion a, evasion and immunological response of the host. The hormonal, immunological, andnutritional changes that occur during pregnancy and are necessary for the successfuldevelopment of the fetus also modulate the susceptibility of the fetus to infection. In thiscontext, the cytokine profile of the placenta protects the fetus from expulsion by inhibiting thecytotoxic cell response, although this also hampers the elimination of the treponema from thematernal-fetal interface. However, the immunological response of the fetus is immature up untilthe 10-10th week of gestation, allowing the pathogen to invade, spread, and escape. Thus, theearly diagnosis for the treatment of the neonate is essential for the prevention of sequels, but asthe public health service does not provide clinical exams for the timely for the diagnosis of thiscondition, there is a clear need for a better understanding of the physiopathogeny of the diseasewith the specific objective of contributing to the advance of clinical research into the problem
RESUMO
INTRODUCTION: Although control measures of maternal and congenital syphilis are available in Brazil, difficulties exist within the healthcare network in providing a laboratory diagnosis of the infection during the prenatal period. The objective of this study was to confirm the presence of Treponema pallidum by PCR in women with positive VDRL serology and lethal pregnancy outcomes, i.e., abortion, stillbirth and neonatal death. METHODS: A retrospective study was conducted on VDRLseroreactive women with lethal pregnancy outcomes admitted to the Fundação Santa Casa de Misericórdia do Pará (FSCM-PA) between January and July 2004. Serum samples and DNA from whole blood were obtained at the time of screening by the VDRL test. These samples were analyzed by IgG ELISA, IgM FTA-Abs and simple PCR (polA). RESULTS: During the study period, 0.7% (36/4,912) of women with lethal pregnancy outcomes presented a positive VDRL test. The polAgene was amplified in 72.7% (24/33) of these women, with 55.6% (20/36) and 94.4% (34/36) presenting IgM and IgG antibodies against T. pallidum, respectively. Comparison of these results showed a significant difference, with agreement between the PCR and IgM FTA-Abs results, suggesting that maternal syphilis was an active infection. No basic cause of death of the conceptus was reported in 97.2% (35/36) of cases. Among women who were submitted to the VDRL test during the prenatal period, only four of the nine seroreactive patients underwent treatment. CONCLUSIONS: The high frequency of syphilis in the group studied indicates the fragility of the service of infection diagnosis, treatment and monitoring, compromising epidemiological control.
INTRODUÇÃO: Apesar das medidas de controle da sífilis materna e congênita estarem disponíveis no Brasil, existem dificuldades da rede em prover o diagnóstico laboratorial da infecção durante o pré-natal. O objetivo deste estudo foi confirmar a presença do Treponema pallidum pela PCR em mulheres com sorologia positiva ao VDRL e com resultado letal da gravidez, isto é, aborto, natimorto e neomorto. MÉTODOS: Estudo retrospectivo realizado em mulheres VDRL-sororeativas com resultado negativo da gravidez, admitidas na Fundação Santa Casa de Misericórdia do Pará FSCM-PA entre janeiro e julho de 2004. As amostras de soro e DNA de sangue total foram obtidas no mesmo período da triagem pelo VDRL. Estas amostras foram analisadas pelo ELISA IgG, FTA-Abs IgM e PCR simples (polA). RESULTADOS: Durante o período de estudo, 0,7% (36/4.912) das mulheres com resultado letal da gravidez apresentaram VDRL positivo. O genepolA foi amplificado em 72,7% (24/33) destas mulheres,com 55,6% (20/36) e 94,4% (34/36) apresentando anticorpos tipo IgG e IgM contra o T. pallidum, respectivamente. A comparação destes resultados mostrou uma diferença estatística significativa, sendo que os resultados da PCR versus FTA-Abs Ig Mmostraram-se concordantes, sugerindo que a sífilis materna era uma infecção ativa. A causa básica de morte dos conceptos não foi relatada em 97,2% (35/36) dos casos. Entre as mulheres que foram submetidas ao VDRL no pré-natal, somente quatro das nove soropositivas receberam tratamento. CONCLUSÕES: A elevada frequência de sífilis no grupo de estudo indica a fragilidade do serviço no diagnóstico, tratamento e monitoramento da infecção, comprometendo o controle epidemiológico.
Assuntos
Feminino , Humanos , Gravidez , Anticorpos Antibacterianos/sangue , Cardiolipinas/sangue , Colesterol/sangue , Fosfatidilcolinas/sangue , Complicações Infecciosas na Gravidez/diagnóstico , Sífilis/diagnóstico , Treponema pallidum/genética , Imunoglobulina G/sangue , Imunoglobulina M/sangue , Reação em Cadeia da Polimerase , Resultado da Gravidez , Estudos Retrospectivos , Sorodiagnóstico da Sífilis/métodos , Treponema pallidum/imunologiaRESUMO
INTRODUCTION: Although control measures of maternal and congenital syphilis are available in Brazil, difficulties exist within the healthcare network in providing a laboratory diagnosis of the infection during the prenatal period. The objective of this study was to confirm the presence of Treponema pallidum by PCR in women with positive VDRL serology and lethal pregnancy outcomes, i.e., abortion, stillbirth and neonatal death. METHODS: A retrospective study was conducted on VDRLseroreactive women with lethal pregnancy outcomes admitted to the Fundação Santa Casa de Misericórdia do Pará (FSCM-PA) between January and July 2004. Serum samples and DNA from whole blood were obtained at the time of screening by the VDRL test. These samples were analyzed by IgG ELISA, IgM FTA-Abs and simple PCR (polA). RESULTS: During the study period, 0.7% (36/4,912) of women with lethal pregnancy outcomes presented a positive VDRL test. The polAgene was amplified in 72.7% (24/33) of these women, with 55.6% (20/36) and 94.4% (34/36) presenting IgM and IgG antibodies against T. pallidum, respectively. Comparison of these results showed a significant difference, with agreement between the PCR and IgM FTA-Abs results, suggesting that maternal syphilis was an active infection. No basic cause of death of the conceptus was reported in 97.2% (35/36) of cases. Among women who were submitted to the VDRL test during the prenatal period, only four of the nine seroreactive patients underwent treatment. CONCLUSIONS: The high frequency of syphilis in the group studied indicates the fragility of the service of infection diagnosis, treatment and monitoring, compromising epidemiological control.
