The Effect of Inhibition of Dopamine D2 Receptors on Some of the Peripheral Blood Mononuclear Cells of the Rat under Food restriction

Background & Objective: In previous studies, the effects of food restriction on the changes in immune responses and brain dopamine content have been determined. On the other hand, it has been shown that immune cells, in addition to dopamine production, also have dopamine receptors. The purpose of this study was to evaluate the effect of inhibition of D2 dopamine receptors on several functions of monocytes of peripheral blood in rat under food restriction Materials & methods: In this experimental study, 36 male Wistar rats (weighing 200-250 gr) were allocated into six groups (n=6), including control groups, food restriction (25%), food restriction (50%), food restriction (75%), food restriction 75% and Sulpiride and rats treated with Sulpiride. Sulpiride was injected Intracerebroventricular at a concentration of 50 μg / rat on day 21 after the study initiation. At the end, the Rats were bled and peripheral blood mononuclear cells were isolated by ficoll gradient method. Results: Food restriction caused a significant decrease in the activity of monocyte cells of gradient of peripheral blood mononuclear cells like neutral red uptake test and respiratory burst (NBT reduction test) simultaneously with decreasing lymphocytes proliferation after stimulation with phytohemagglutinin. Administration of Sulpiride with a 75% Food restriction resulted in the improvement of these functions of monocyte cells of gradient of peripheral blood mononuclear cells as well as lymphocyte proliferation. Conclusion: Intracerebroventricular administration of dopamine D2 receptor antagonists (sulpiride) effectively inhibited the effects of a severe dietary restriction on the suppression of immunity system

Comparing the Effects of Aloe Vera Leaf Extract On K562 Tumor Cell and Peripheral Blood Mononuclear Cells

Aims Aloe Vera is among the crucial medicinal plants, with proven anti-cancer effects. This study aimed to investigate the effect of plant extracts of Aloe Vera Leaf (AVL) on the proliferation of cell lines K562 (erythroleukemia) and Peripheral Blood Mononuclear Cells (PBMCs). Methods &amp; Materials The inner parts of the plant, including the gelatinous substance, were emptied, and the outer layer was used to prepare the lyophilized extract. The extract was dissolved in DMSO. K562 cells and PBMCs were cultured with 9.375, 18.75, 37.5, 75, 150, and 300 μg/mL concentrations of AVL for 24, 48, or 72 hours. After cultivation, the IC50 was determined for the K562 and normal PBMCs, using the MTT assay (4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide). Doxorubicin was used as a positive control. Findings The obtained data suggested that the viability of cells in both the leukemic cell line and normal PBMCs significantly decreased by the treatment with the extract in a dose-dependent manner; however, the AVL toxicity for PBMC was significantly more than K562. IC50 for the standard drug was also significantly less than AVL extract. Conclusion AVL possesses cytotoxic effects for K562 and PBMCs. Nevertheless, it has no selective benefits and has more cytotoxic effects on PBMCs.</jats:p