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C Carini

Publications and source records attributed to C Carini.

59 records · Page 4Linked to original sources
PubMedDate not supplied

Interleukin-7 modulates CD23 and HLA-DR expression on CD4+ T cells and promotes a Th-2 type citokine profile.

The expression of CD23 on PHA-activated human PBT (peripheral blood T) cells of healthy donors was investigated. It appears that CD23 is expressed solely on activated CD4+ T cells. Cytofluorotometric analysis revealed that 6% of PHA-activated CD4+ T cells expressed CD23, while unstimulated CD4+ T cells express no detectable CD23. The addition of IL-7 (1000 U/ml) to activated CD4+ T cells resulted in a marked augmentation of CD23 expression (29%). CD23 expression was blocked by M20 and M26 mAbs, but no reduction was detected by anti-IL-2R (CD25) mAb. This suggests that IL-7 has a specific regulatory effect on CD23 expression independent of IL-2. Northern Blot analysis showed a marked increase of CD23 mRNA detected in PHA-activated CD4+ T cells plus IL-7. IL-7 was also able to upregulate the expression of HLA-DR on activated CD4+ T cells. Optimal HLA-DR and CD23 induction by IL-7 occurred at 48 and 72 h of culture. The addition of CHX revealed that the induction of CD23 and HLA-DR by IL-7 required intact protein synthesis. Furthermore, PHA activated CD4+ T cells cultured in the presence of IL-7 are polarized to a Th-2 pattern of cytokine production.

CD3 Complex↗
PubMedDate not supplied

Modulation of TCR usage in HIV-1 infection is regulated by IL-7 and sCD23.

The purpose of this study is to elucidate the effect of interleukin-7 (IL-7) and soluble CD23 (sCD23) on Phorbol12 Myristate13 Acetate (PMA) activated CD4+ TCR alpha beta+ cells of HIV-1 infected subjects. CD23 and IL-7R were detectable on activated CD4+ T cells of these subjects by FACS. Addition on IL-7 (1000 U/ml), at the onset of cultures, resulted in a significant increase of CD23 expression. We also demonstrated that T cells proliferation and CD23 expression in the presence of exogenous IL-7 occur in an IL-2 independent manner. Addition of IL-7 and sCD23 to activated CD4+ cells of HIV-1 infected subjects induced a proliferative response of TCR alpha beta cells. In contrast, addition of either sCD23 or IL-7 to activated CD4+ T cells did not result in an increase of TCR alpha beta expression. The data provide direct evidence that sCD23 in combination with IL-7 induce proliferation of activated CD4+ T cells of HIV-1 infected subjects to augment TCR alpha beta expression. These results support the possibility that IL-7 plus sCD23 might play an important role in the modulation of TCR alpha beta expression in HIV infection.

Adult↗