Résumé
OBJECTIVE@#To explore the correlation of EB virus infection with the prognosis of B-ALL children.@*METHODS@#The peripheral blood of children with newly diagnosed B-ALL admitted in Children's Hospital of Chongqing Medical University from January 2012 to December 2017 were collected, and the EBV DNA in plasma was detected by real-time quantitative PCR. The clinical data of B-ALL children were collected and the correlation of EBV infection with the prognosis of B-ALL children was analyzed.@*RESULTS@#Among 162 B-ALL children, the EBV infection rate was 41.36%. Univariate analysis showed that the B-ALL children with EBV infection had the poor prognosis and higher risk of shorter survival time, as compared with B-ALL children without EBV infection (HR=2.373, 95% CI: 1.129-4.987) (P＜0.05), the multivariate analysis showed that the result was consistent with result of univariate analysis indicating that EBV infection was an independent predictor for poor prognosis of B-ALL children.@*CONCLUSION@#The EBV infection may play an important role in the occurrence and progression of B-ALL and is an independent predictor for poor prognosis, therefore the detection of EBV DNA in plasma of B-ALL children possesses an important significance for evaluation of B-ALL children's prognosis.
Sujets)
Enfant , Humains , Lymphocytes B , ADN viral , Infections à virus Epstein-Barr , Herpèsvirus humain de type 4 , Leucémie-lymphome lymphoblastique à précurseurs B et T , PronosticRésumé
This study was aimed to explore the immune escaping mechanisms based on expression and abscission of human natural killer (NK) cell activating receptors NKG2D and their ligands MICA/B, ULBP-1, 2, 3 in patients with acute leukemia (AL). 30 de novo AL patients and 10 healthy persons (control) were enrolled in study. Flow cytometry was used to detect the expression levels of MICA/B, ULBP-1, 2, 3 on leukemic cells. ELISA was used to detect the levels of soluble MICA (sMICA), solube MICB (sMICB) and soluble ULBP-1, -2, -3 in the serum. The results showed that sMICA, sMICB and ULBP-1, -2, -3 were not expressed or expressed at very low levels on leukemia cells of the patients; the levels of free sMICA and sMICB in serum of AL patients were higher than that in serum of healthy persons, there was significant difference (p<0.01). But the levels of ULBP 1-3 in serum of AL patients did not show obvious statistical difference as compared with healthy persons (p>0.05). It is concluded that the negative or low expression of NKG2D ligands (MICA, MICB and ULBPs) on surface of acute leukemia cells may lead to the immune escape of leukemia cells, the abscission of MICA and MICB, and the deficiency of ULBP expression on leukemia cells may be one of immune escape mechanisms of leukemia cells.
Sujets)
Femelle , Humains , Mâle , Études cas-témoins , Cytométrie en flux , Protéines liées au GPI , Allergie et immunologie , Métabolisme , Régulation de l'expression des gènes dans la leucémie , Antigènes d'histocompatibilité de classe I , Allergie et immunologie , Métabolisme , Protéines et peptides de signalisation intercellulaire , Allergie et immunologie , Métabolisme , Protéines et peptides de signalisation intracellulaire , Allergie et immunologie , Métabolisme , Leucémies , Sang , Allergie et immunologie , Sous-famille K des récepteurs de cellules NK de type lectine , Allergie et immunologie , Métabolisme , Échappement de la tumeur à la surveillance immunitaireRésumé
Objective To explore the alterations of protein phosphatase-2A (PP-2A) in lymphocytes in mild cognition impairment (MCI) and Alzheimer's disease (AD).Methods The activity PP-2A of was measured by ~(32)p liquid seintillography for incorporated radioactivity in control group(n=11) , the MCI group(n=11),and the AD group(n=11).The expression of PP-2A was determined by Western blot.Results In the control group,the activity of PP-2A (1.01?0.09) and the expression of PP-2A (0.96?0.07) were high while in the MCI group,the activity of PP-2A (0.71?0.12) and the expression of PP-2A (0.80?0.05) were decreased (both P