Nattaporn Lousuwan. The suppression of TGF-Beta expression in dendritic cells using shRNA modulate Th1/TH2 patterns on CD4+ T cells . Master's Degree(Pharmacology). Mahidol University. : Mahidol University, 2007.
The suppression of TGF-Beta expression in dendritic cells using shRNA modulate Th1/TH2 patterns on CD4+ T cells
Abstract:
Transforming growth factor beta (TGF-β) is a pleiotropic cytokine with essential
regulators of cellular and physiological processes. It plays an important role in immune
regulation by inhibition of T cell proliferation, differentiation, and T cell stimulatory functions
of antigen presenting cells (APCs). Furthermore, TGF-β expressions are correlated with
advanced clinical stages of the tumor via cancer cells. These cancer cells tend to increase
production of TGF-β and help cancer to escape from immunosurveillance. RNA interference
(RNAi) is a mechanism for sequence-specific posttranscriptional inhibition of gene expression
via double stranded RNA molecules. This technology provides a powerful tool for inhibiting
endogenous gene and is now an established technique for experimental knockdown of gene
expression in mammalian cells.
This thesis demonstrated the newly constructed plasmid vector specific for TGF-β1
mRNA. The RNAi using short hairpin RNA (shRNA) succeeded in decreasing the
intracellular expression of TGF-β1 in targeted cells (cholangiocarcinoma and dendritic cells).
The TGF-β1 knockdown in dendritic cells biased the co-cultured CD4+ T cells toward the T
helper 2 (Th2) phenotype. Furthermore, the TGF-β1 knockdown in tumor’s RNA pulseddendritic
cells enhances the cytolytic activity of co-cultured γδ T cell against the allogeneic
cholangiocarcinoma cell