Th1 cells that produce IFN-gamma are essential in the elimination of intracellular pathogens, and Th2 cells that synthetize IL-4 control the eradication of helminths. However, highly polarized Th1 or Th2 responses may be harmful and even lethal. Thus, the development of strategies to selectively down-modulate Th1 or Th2 responses is of therapeutic importance. Herein, we demonstrate that dihydro...

background : the current study was designed to evaluate immune responses induced by dna vaccines encoding 8-kda subunit of antigen b (hydi) of echinococcus granulosus and murine interleukin 12 (il-12) as genetic adjuvants in balb/c mice. methods : expression plasmid pcdna3.1 containing hydi (pchyd1) as vaccine along with the murine interleukin 12 (pcmil12) as adjuvant were used. thirty-five mic...

background: the aim of this study was to determine the th1 and th2 serum cytokines, in patients with psoriasis and to com pare their cytokine levels with those of normal control subjects. methods: serum levels of interferon-gamma (ifn-γ), interleukin-2 (il-2), interleukin-4 (il-4), and interleukin-10 (il-10) were measured by enzyme linked immunosorbent assay in 40 patients with psoriasis and in...

The relative contributions of basophils and dendritic cells in Th2 skewing to foreign antigen exposure remain unclear. Here we report the ability of basophils to induce Th2 polarization upon epicutaneous sensitization with different antigens using basophil conditionally depleted Bas TRECK transgenic mice. Basophils are responsible for Th2 skewing to haptens and peptide antigens, but not protein...

One theory of immune regulation involves homeostasis between T-helper 1 (Th1) and T-helper 2 (Th2) activity. The Th1/Th2 hypothesis arose from 1986 research suggesting mouse T-helper cells expressed differing cytokine patterns. This hypothesis was adapted to human immunity, with Th1- and Th2-helper cells directing different immune response pathways. Th1 cells drive the type-1 pathway ("cellular...

The immune response in atopic dermatitis (AD) is driven predominantly by T helper (Th2) cells. Th2-type cytokines interleukin (IL)-4, and IL-13 activate the Janus kinase/signal transduction activator of transcription (JAK-STAT) signaling pathway, which essential for their pro-inflammatory action detrimental effects on permeability barrier epidermis. lipid abnormalities have not been completely ...

The liver is the major site of clearance and degradation of foreign antigens from the portal circulation. Despite the presence of hepatic accessory cells, antibody responses to orally administered antigens are uncommon. To ascertain if hepatic accessory cells are incapable of stimulating specific subsets of T lymphocytes, freshly isolated hepatic nonparenchymal and splenic cells were cultured w...

Helminth parasites are known to elicit the immune response towards T helper 2 (Th2)type, characterized by Th2 related cytokines, that typically include interleukin-4 (IL4), IL-5 and IL-13. In this review we will describe the mechanisms involved in helminth induced Th2 immune response. Intestinal epithelial cells (IECs) produce thymic stromal lymphopoietin (TSLP), which is both necessary and suf...

The immune system of the human organism comprises the innate system cells and the adaptive immune cells. The former include the hematopoietic cells, mast cells, basophils, monocytes, dendritic cells (DCs) and macrophages, and the latter include CD4+ T cells, CD8+ T cells, T regulatory cells (Tr) and B cells. The innate system DCs are the major antigen-presenting cells to Th(o) CD4+ T cells in l...

Th2 cells are recruited to the lung where they mediate the asthma phenotype. Since the molecular mechanisms regulating Th2 cell trafficking remain unknown, we sought to determine whether trafficking of Th2 cells into the lung is mediated by G alpha i-coupled chemoattractant receptors. We show here that in contrast to untreated Th2 cells, pertussis toxin-treated Th2 cells were unable to traffic ...