Definições para a padronização da pesquisa de auto-anticorpos contra constituintes do núcleo (FAN HEp-2), nucléolo, citoplasma e aparelho mitótico e suas associações clínicas II Brazilian Consensus on Antinuclear Antibodies in HEp-2 Cells Definitions for standardization of autoantibody testing against the nucleus (ANA HEp-2), nucleolus, cytoplasm and mitotic apparatus, as wel as its clinical associations
Two types of antibodies were differentiated in conventional guinea pig anti-hen egg-white lysozyme (HEL) antisera. The specificities of both antibodies were directed to the loop I region (mainly directed to Cys64--Cys80 loop) but the antibodies were distinct in respect of reactivities with native HEL. One type of antibody reacted with HEL and loop-peptides of HEL but not with the completely reduced and carboxymethylated form of loop-peptides (native conformation specific antibody: NC-Ab). On the other hand, the other type of antibody did not react with HEL but reacted with loop-peptides and also with the completely reduced and carboxymethylated form of loop-peptides (non-native conformation specific antibody: NNC-Ab). The percentage of NNC-Ab in loop I reactive antibody fraction from pooled guinea pig anti-HEL antisera obtained by two different immunization methods was about 25%. Since the affinities of the NNC-Ab to loop-related peptides were higher by one order of magnitude than those of the NC-Ab to the same peptides, care is necessary in evaluating antigenic determinants in native protein. The immunization of guinea pigs with Ploop I . II [sequence 57-107 (Cys64-Cys80, Cys76-Cys94)] evoked an antibody population having specificity similar to but not identical with that of the NNC-Ab type anti-loop I antibody in conventional anti-HEL antisera.
Paracoccidioidomycosis (PCM) is a chronic granulomatous infectious disease, endemic in subtropical areas of Central and South America. The diagnosis of the central nervous system (CNS) involvement with PCM (neuroparacoccidioidomycosis [NPCM]) frequently is difficult. A definitive diagnosis usually is made by visualization or isolation of Paracoccidioides brasiliensis from CNS biopsy or necropsy material. In the present study, we determined the presence of anti-gp43 antibodies in the cerebrospinalfluid (CSF) of patients with CNS involvement in PCM by enzyme-linked immunosorbent assay (ELISA) in 9 cases of NPCM and 15 control cases. ELISA anti-gp43 was compared with double immunodiffusion (DID). ELISA anti-gp43 was positive in 8 (89%) of 9 CSF samples from patients with NPCM and negative in all CSF samples of the control group. DID was negative in all CSF samples from patients with NPCM and control samples. ELISA anti-gp43 in CSF samples is better than DID for the diagnosis of NPCM. It is a sensitive and specific diagnostic method and has high predictive values. To our knowledge, this is thefirst time ELISA anti-gp43 was applied to CSF.
-Several markers have been studied for their ability to make the CNS infiltration diagnosis earlier and more precise; previous studies showed that CSF ferritin concentrations were higher in patients with malignant invasion of CNS. The objective was to determine the importance of CSF ferritin as a biomarker for the diagnosis of CNS neoplasic infiltration. This study is based on 93 CSF samples, divided into five groups: malignant cells present (n13); malignant cells not present (n26); inflammatory neurological diseases (n16); neurocysticercosis (n20); acute bacterial meningitis (n18). CSF ferritin values were determined by micro particle enzyme immunoassay. CSF ferritin level (mean±SD) in the group with neoplasic cells in the CSF was 42.8±49.7 ng /mL, higher than in the other groups (p<0.0001). We conclude that CSF ferritin with the cut off 20 ng/mL could be an adjuvant biomarker to the diagnosis of CNS malignant infiltration.Key WorDS: cerebrospinal fluid, ferritin, central nervous system, malignant cells, CNS neoplasm, CNS tumors, bacterial meningitis.
Quantificação de ferritina no líquido cefalorraquidiano como biomarcador para o diagnóstico de infiltração maligna no sncResumo -Diversos marcadores foram estudados com a finalidade de avaliar sua capacidade de diagnosticar a infiltração neoplásica no SNC precocemente e de forma mais precisa. estudos anteriores mostraram que as concentrações de ferritina no LCr eram mais elevadas nos pacientes com infiltração neoplásica no SNC. o objetivo foi determinar a importância da ferritina no LCr como biomarcador para o diagnóstico de infiltração neoplásica no SNC. este estudo é baseado em 93 amostras do LCr, divididas em cinco grupos: células malignas presentes (n13); células malignas ausentes (n26); doenças neurologicas inflamatórias (n16); neurocisticercose (n20); meningites bacterianas agudas (n18). os valores de ferritina no LCr foram determinados por eLISA de microparticulas. o nível de ferritina no LCr (média±desvio padrão) no grupo com células neoplásicas no LCr foi 42,8±49,7 ng/mL, mais elevado do que nos outros grupos (p<0.0001). Concluímos que a ferritina no LCr com cut off de 20 ng/mL pode ser um biomarcador para o diagnóstico de infiltração maligna no SNC.PALAvrAS-ChAve: líquido cefalorraquidiano, sistema nervoso central, células malignas, neoplasias do SNC, tumores do SNC, meningites bacterianas.
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