Effect of alpha 2b interferon on inducement of mIL-2R and treatment of HCV in PBMC from patients with chronic viral hepatitis C

Expression of T subsets and mIL-2R in peripheral blood of newborns with hypoxic ischemic encephalopathy

BACKGROUND

Infantile and undifferentiated immune cells in the pathogenesis of neonates with HIE have been studied in recent years. This study was undertaken to observe the expression level of T subsets and membrane interleukin-2 receptor (mIL-2R) in the peripheral blood of newborns with hypoxic ischemic encephalopathy (HIE) and its clinical manifestations.

METHODS

The peripheral blood mononuclear cells (PBMCs) of newborns with HIE and normal controls were isolated by the routine Ficoll-Hypaque method, and the rates of CD3+, CD4+, CD8+, CD4+/CD8+ and mIL-2R induced and not induced by phytohemagglutinin (PHA) were detected by biotin-streptavidin (BSA) at the first, third and seventh day after birth.

RESULTS

At the first day after birth, the positive rates of CD3+, CD4+, CD8+, CD4+/CD8+ and mIL-2R induced and not induced by PHA were (37.4+/-6.7)%, (29.4+/-6.9)%, (16.7+/-3.3)%, 1.8+/-0.5, (3.6+/-1.1)% and (20.9+/-4.8)%, respectively. Significant differences were observed between the HIE group and the normal controls (P<0.01-P<0.05). At the third day after birth, the positive rates of CD3+, CD4+, CD8+, CD4+/CD*+ and mIL-2R induced and not induced by PHA were (41.0+/-7.4)%, (35.8+/-6.9)%, (22.6+/-4.5)%, (1.7+/-0.5), (3.9+/-1.2)%, and (22.8+/-5.1)%, respectively. There were significant differences between the HIE group and the normal controls (P<0.05). At the seventh day after birth, the positive rates of CD3+, CD4+, CD8+ were (41.8+/-6.1)%, (36.4+/-5.1)% and (25.6+/-4.3)%, respectively. There was significant difference between the HIE group and the normal controls (P<0.05). The ratio of CD4+/CD8+ and the expression level of mIL-2R induced and not induced by PHA were 1.5+/-0.3, (4.1+/-1.2)% and (23.8+/-5.2)%, respectively. There was no significant difference between the HIE group and the normal controls (P>0.05).

CONCLUSIONS

Peripheral blood mononuclear cells of newborns are immature and undifferentiated with a very low expression level of surface markers. The changes of cell immunity involve in the pathogenesis of HIE. The disorder of cellular immune function exists in newborns with HIE. Cell immunity and immune regulative response in newborns are gradually improved or mature during the period of growing, facilitating the recovery from brain injury caused by HIE.

Construction of human CD81 eukaryotic expression vector and expression of the gene segment in COS-7 cell line

AIM: To construct a human CD81 eukaryotic expression vector and to analyze the expression of CD81 in COS-7 cells.

METHODS: CD81 gene from the pMD18-T-CD81 vector with double-enzyme digestion was cloned into the pVAX1 eukaryotic expression vector, named pVAX1-CD81. The recombinant vector pVAX1-CD81 and pVAX1 as controls were transfected into COS-7 cells by lipofectamine, and the transient expression product on the transfected cells was analyzed with anti-CD81 monoclonal antibody by indirect immunofluorescence assay (IFA).

RESULTS: The identification of the eukaryotic expression vector pVAX1-CD81 by PCR and restriction enzyme analysis showed that CD81 gene was rightly inserted into the vector; and the product of the CD81 gene was successfully expressed on surface of COS-7 cells.

CONCLUSION: The eukaryotic expression vector with CD81 gene is constructed and efficiently expressed in COS-7 cells. The results indicate that the transfected CD81 cells will need to further studies on the roles of CD81 in the process of HCV infection and entrance to cells.