Objective To explore the clinical significance of detection of 14 kinds of food allergen-specific IgG. Methods Fourteen kinds of food allergen-specific IgG were detected by ELISA method in 211 patients with allergic diseases,and IgG positive rates of various foods were compared among patients with different sex,age and allergic diseases. Results Positive food allergen-specific IgG was detected in 193(91.4%)patients.Among 14 kinds of foods,the positive rate of food allergen-specific IgG was the highest for eggs(73.9%),and milk came the second.However,no elevated food allergen-specific IgG was observed for chicken and meat.Milk was the most common sensitizers for 0-12 month-old patients,and egg was the first cause for the other age groups.There were significant differences in the positive rates of food allergen-specific IgG for milk among different age groups(P<0.01).There was no significant difference in the positive rate of food allergen-specific IgG between males and females(P>0.05).The positive rate of food allergen-specific IgG in patients with eczema was the highest(96.4%),and the lowest(83.3%)was found in those with chronic diarrhea,while there was no significant difference among different diseases(P>0.05).The positive rate of food allergen-specific IgG for milk differed significantly among different diseases(P<0.01).Positive food allergen-specific IgG was detected in 12 kinds of food(except for chicken and meat) for patients with allergic purpura. Conclusion Food intolerance is a complex allergy.The food allergen-specific IgG detection is of great importance as reference for etiologic diagnosis of allergic diseases.

Objective To study the effects of intravenous immunoglobulin (IVIG) on neonatal lymphocyte immune function. Methods Cord blood mononuclear cells (CBMCs) and CD3+ T lymphocytes were isolated from 8 neonates and were cultured with IVIG and/or/without phytohemagglutinin (PHA)based on which divided into five groups, i. e. (l)control group, (2)PHA activation group, (3) IVIG pre-inhibition group, (4) PHA pre-activation group and (5) PHA+IVIG group. The production of IFN-? and IL-4 of CBMCs and cord blood CD3+ T lymphocytes was measured with ELISA and the expression of IL-2 and IL-4 mRNA was measured with RT-PCR. The results were compared with peripheral blood mononuclear cells(PBMCs) of 8 adults. Results The production of IFN-y by CBMCs and cord blood CD3+ T lymphocytes induced by PHA decreased after IVIG was given, while more remarkable decrease in the CBMCs was shown without any association with IVIG was given or not before or after PHA was used [Group 2; (313. 34?108. 00)pg/ml, Group 3: (17. 68?17. 98) pg/ml, group 4 : (170. 72?38. 25) pg/ml, group 5: (11. 10?8. 92)pg/ml]. For the CD3+ T lymphocytes, the decrease of IFN-? production was only observed in group 3, 4 and group 5 [(35. 30 ?12. 21)pg/ml, (8. 61?6. 21) pg/ml and (8. 54?1. 57)pg/ml]. The degree of decrease of IFN-? production by CBMCs was much lower [group 2: (1121. 11 ? 344. 58)pg/ml, group 3: (29. 08 ? 11. 20)pg/ml, group 4: (339. 63?47. 43) pg/ml, group 5: (26.40?21. 97)pg/ml]. The secretion for IL-4 did not changed when stimulated by PHA alone, but IL-2 and IL-4 mRNAs expression can be detected in CBMCs after repeated stimulation by PMA, PHA and rIL-2 which decreased after IVIG was given. Conclusions IVIG can suppress the production of IFN-? in cord blood T lymphocyte directly or mediated by other immune cells or molecules. IVIG can also decreased the expression of IL-2 mRNA and IL-4 mRNA in CBMCs. The effect of IVIG on the proliferation of cord blood lymphocytes and production of immunoglobulin in B lymphocytes might be associated with these inhibition.

Objective To develop a flow cytometrie assay to for diagnosis of X-Linked Hyper.1gM Syndrome(XHIM).Methods Heparinized peripheral blood obtained from patient,mother and a healthy control was diluted with RPMI- 1640(unstimulated control)or with RPMI-1640 containing 15μl PMA(1 rig/μl)and 6 trl ionomycin(50 ng/μl)(stimulated cell).Using directly labeled antibodies,we have examined CD40 ligand levels on CD3+ CD8- lymphocyte surface,and CD69 levels on CD;lymphocyte Surface to determine whether the cells were activated.Results CD69 levels on CD3+ lymphocyte surface from stimulated group and from unstimulated group were above 96% and below 3%,respectively.CD40L levels Oil CD3 CDs-T lymphocyte surface from stimulated group were 0.8% (patient),60.04%(mother) and 62.87%(healthy contr01).CD40L levels on CD3+ CD8-T lymphocyte surface from unstimulated group were 0.88% (patient),4.15%(mother)and 5.51%(healthy contr01).Conclusion This flow cytometric assayis accurate and convenient,which Can be used in neonatal screening.

Objective To verify the relationship between transforming growth factor-β1(TGF-β1) and interleukin-10 (IL-10) in breast milk and allergic diseases development in infants. Methods Totally 191 mothers (99 allergics and 92 controls) and their full-term newborns participated in this prospective study on development of children atopy. Maternal blood, cord blood, colostrum and mature milk were assayed for TGF-β1 and IL-10 by enzyme-linked immunosorbent assay. Infants underwent pediatrician evaluation for allergic diseases at six months old. Concentrations of TGF-β1 and IL-10 from allergic and non-allergic mothers and prevalence of allergic diseases of infants were compared. Results The level of IgE in allergic mothers was 30 750 IU/L(6600-410000 IU/L),lower than that in non-allergic mothers[50000 IU/L(7100-610000 IU/L)](Z=-3. 444,P=0. 001).No difference in the concentration of TGF-β1, IL-10 and IgE in mature milk was observed between allergic and non-allergic mothers. TGF-β1, IL-10 and IgE levels in colostrum of allergic mothers were 2300 pg/ml(620-7000 pg/ml), 12. 8 pg/ml(7.5-560.0 pg/ml)and 7000 IU/L(5100-56000 IU/L),significantly higher than those in non-allergic mothers[1830 pg/ml(1240-9400 pg/ml), 11. 1 pg/ml (7. 2-630.0 pg/ml)and 6700 IU/L(5200-35000 IU/L)] (Z=-2. 215, -2. 730 and -2. 706,P＜0.05).In both allergic and non-allergic mothers, TGF-β1 and IL-10 levels in cord blood were higher than those in maternal blood, while IgE was lower. TGF-βl and IL-10 and IgE levels in colostrum were higher than mature milk(P＜0.05). At six months old, the prevalence of allergic diseases of infants from allergic mothers(59. 6%, 59/99) was significantly higher than those from non-allergic mothers (21. 7%, 20/92)(x2= 28. 177, P= 0. 000). The prevalence of allergic diseases of infants who completed two weeks' colostrum-fed after birth (44.5 %, 73/164) was significantly higher than those who did not (22.2%,6/27)(x2 =4. 749,P-=0. 029). Conclusions High concentration of TGF-βl and IL-10 in colostrum does not show any protective effect against allergic diseases in infants. The prevalence of allergic diseases of colostrum-fed infants is significantly higher than non colostrum-fed infants, showing that colostrum-fed might play a role in allergic diseases development.

In order to investigate the potential anti-leukemic effect of cyclosporin A(CsA), MTT method and cell viability assay in vitro were carried out in this study to observe the effect of CsA on the proliferation and cell viability of various leukemic cell lines, such as T-cell Jurkat, Molt-4, CCRF-CEM, Nalm-6, K562 and multi-drug-resistant leukemic cell line K562/AO2. The results fully showed that CsA did possess the same cytotoxic action on all the leukemic cell lines, particularly including multi-drug-resistant leukemic cell line,and could then inhibit the proliferation and cell viability of these leukemic cells, thereby indicating that CsA might be applied as one of the new, safe and effective anti-leukemic agents when used with clinically adoptable dosage in leukemias.