Creativity in children with ADHD: Effects of medication and comparisons with normal peers.

This study is to identify the performance of children with and without ADHD in open-ended and closed-ended creativity assessments, and investigate the moderating effect of medicated and unmedicated Children. The study subjects included third to sixth graders: 43 children with ADHD and 43 typically developing children. The participants with ADHD were those who were identified by local Committees of Identification, Placement and Consultation for Children with Special Needs or those who were diagnosed by medical institutions. Children with ADHD were further divided into medicated (22 participants) and unmedicated groups (21 participants) based on their current medication treatment. This study employed the New Tests of Creative Thinking to gauge the participants' open-ended creativity, while Remote Associates Test and the Insight Test were used to assess the participants' closed-ended creativity. Although previous evidence for creativity in children with ADHD have been mixed, this study includes medication as moderation variable and suggests that the performance of unmedicated children with ADHD in the open-ended creativity assessments was better than medicated children with ADHD and typically developing children. The study results can further explore the creativity characteristics of children with ADHD.

Tumor-derived chemokine CCL5 enhances TGF-ß-mediated killing of CD8(+) T cells in colon cancer by T-regulatory cells.

Chemokine CCL5/RANTES is highly expressed in cancer where it contributes to inflammation and malignant progression. In this study, we show that CCL5 plays a critical role in immune escape in colorectal cancer. We found that higher levels of CCL5 expression in human and murine colon tumor cells correlated with higher levels of apoptosis of CD8+ T cells and infiltration of T-regulatory cells (T(reg)). In mouse cells, RNA interference (RNAi)-mediated knockdown of CCL5 delayed tumor growth in immunocompetent syngeneic hosts but had no effect on tumor growth in immunodeficient hosts. Reduced tumor growth was correlated with a reduction in T(reg) infiltration and CD8(+) T-cell apoptosis in tumors. Notably, we found that CCL5 enhanced the cytotoxicity of T(reg) against CD8(+) T cells. We also found tumor growth to be diminished in mice lacking CCR5, a CCL5 receptor, where a similar decrease in both T(reg) cell infiltration and CD8(+) T-cell apoptosis was noted. TGF-ß signaling blockade diminished apoptosis of CD8(+) T cells, implicating TGF-ß as an effector of CCL5 action. In support of this concept, CCL5 failed to enhance the production of TGF-ß by CCR5-deficient T(reg) or to enhance their cytotoxic effects against CD8(+) T cells. CCR5 signaling blockade also diminished the in vivo suppressive capacity of T(reg) in inhibiting the antitumor responses of CD8(+) T cells, in the same way as CCL5 signaling blockade. Together, our findings establish that CCL5/CCR5 signaling recruits T(reg) to tumors and enhances their ability to kill antitumor CD8(+) T cells, thereby defining a novel mechanism of immune escape in colorectal cancer.

Host TNF-alpha-1031 and -863 promoter single nucleotide polymorphisms determine the risk of benign ulceration after H. pylori infection.

OBJECTIVES: This study tested whether host genotypes of the tumor necrosis factor-alpha (TNF-alpha) promoter single nucleotide polymorphism (SNP) could determine clinical and histological outcomes after Helicobacter pylori infection. METHODS: A total of 524 dyspeptic patients, 424 with and 100 without H. pylori infection, were checked for TNF-alpha promoter SNP over the locus on -1031(T/C), -863(C/A), -857(C/T), -806(C/T), and -308(G/A) by sequence-specific oligonucleotide probe. Each patient received panendoscopy to take gastric biopsy to detect H. pylori infection and its related histology using the updated Sydney's system. Gastric TNF-alpha expressions were stained by immunohistochemistry. RESULTS: In H. pylori-infected patients, -1031C or -863A carriers of TNF-alpha promoter had more severe gastric neutrophil infiltration and TNF-alpha gastric staining than individuals with -1031TT or -863CC genotype, respectively (p<0.05). The multivariate logistic regression verified both -1031C and -863A carriers were independent risk factors to have duodenal ulcers and gastric ulcer without IM in the H. pylori-infected hosts (p<0.05). As compared to -863CC and -1031TT genotype combinations, the ulcer risk after H. pylori infection was 2.46 (95% CI: 1.32-4.59, p